initial validator API-networking related things

adapted from DKG impl

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,9 @@
+# Description
+
+Closes: #XXXX
+
+<!-- If appropriate, insert relevant description here -->
+
+# Checklist:
+
+- [ ] added a changelog entry to `CHANGELOG.md`

.github/workflows/build_on_dispatch.yml

@@ -0,0 +1,72 @@
+name: Continuous integration on dispatch
+
+on: workflow_dispatch
+
+jobs:
+  build:
+    runs-on: [ self-hosted, custom-linux-exoscale ]
+    # Enable sccache via environment variable
+    env:
+      RUSTC_WRAPPER: /home/ubuntu/.cargo/bin/sccache
+    steps:
+      - name: Install Dependencies (Linux)
+        run: sudo apt-get update && sudo apt-get -y install libwebkit2gtk-4.0-dev build-essential curl wget libssl-dev libgtk-3-dev squashfs-tools
+
+      - name: Check out repository code
+        uses: actions/checkout@v2
+
+      - name: Install rust toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+          components: rustfmt, clippy
+
+      - name: Build all binaries
+        uses: actions-rs/cargo@v1
+        with:
+          command: build
+          args: --workspace
+
+      - name: Run all tests
+        uses: actions-rs/cargo@v1
+        with:
+          command: test
+          args: --workspace --all-features
+
+      - name: Check formatting
+        uses: actions-rs/cargo@v1
+        with:
+          command: fmt
+          args: --all -- --check
+
+      - uses: actions-rs/clippy-check@v1
+        name: Clippy checks
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          args: --all-features
+
+      - name: Run clippy
+        uses: actions-rs/cargo@v1
+        with:
+          command: clippy
+          args: --workspace -- -D warnings
+
+      - name: Build all binaries with coconut enabled
+        uses: actions-rs/cargo@v1
+        with:
+          command: build
+          args: --workspace --features=coconut
+
+      - name: Run all tests with coconut enabled
+        uses: actions-rs/cargo@v1
+        with:
+          command: test
+          args: --workspace --features=coconut
+
+      - name: Run clippy with coconut enabled
+        uses: actions-rs/cargo@v1
+        with:
+          command: clippy
+          args: --features=coconut -- -D warnings

.github/workflows/network-explorer.yml

@@ -31,6 +31,8 @@ jobs:
 #      continue-on-error: true
     - run: yarn && yarn build
       continue-on-error: true
+    - run: yarn storybook:build
+      name: Build storybook
     - name: Deploy branch to CI www
       continue-on-error: true
       uses: easingthemes/ssh-deploy@main
@@ -42,6 +44,17 @@ jobs:
         REMOTE_USER: ${{ secrets.CI_WWW_REMOTE_USER }}
         TARGET: ${{ secrets.CI_WWW_REMOTE_TARGET }}/network-explorer-${{ env.GITHUB_REF_SLUG }}
         EXCLUDE: "/dist/, /node_modules/"
+    - name: Deploy storybook to CI www
+      continue-on-error: true
+      uses: easingthemes/ssh-deploy@main
+      env:
+        SSH_PRIVATE_KEY: ${{ secrets.CI_WWW_SSH_PRIVATE_KEY }}
+        ARGS: "-rltgoDzvO --delete"
+        SOURCE: "explorer/storybook-static/"
+        REMOTE_HOST: ${{ secrets.CI_WWW_REMOTE_HOST }}
+        REMOTE_USER: ${{ secrets.CI_WWW_REMOTE_USER }}
+        TARGET: ${{ secrets.CI_WWW_REMOTE_TARGET }}/ne-sb-${{ env.GITHUB_REF_SLUG }}
+        EXCLUDE: "/dist/, /node_modules/"
     - name: Keybase - Node Install
       run: npm install
       working-directory: .github/workflows/support-files
@@ -51,6 +64,7 @@ jobs:
         NYM_PROJECT_NAME: "Network Explorer"
         NYM_CI_WWW_BASE: "${{ secrets.NYM_CI_WWW_BASE }}"
         NYM_CI_WWW_LOCATION: "network-explorer-${{ env.GITHUB_REF_SLUG }}"
+        NYM_CI_WWW_LOCATION_STORYBOOK: "ne-sb-${{ env.GITHUB_REF_SLUG }}"
         GIT_COMMIT_MESSAGE: "${{ github.event.head_commit.message }}"
         GIT_BRANCH: "${GITHUB_REF##*/}"
         KEYBASE_NYMBOT_USERNAME: "${{ secrets.KEYBASE_NYMBOT_USERNAME }}"

.github/workflows/nightly_build.yml

@@ -94,12 +94,45 @@ jobs:
           command: test
           args: --workspace --features=coconut
 
+      - name: Reclaim some disk space (because Windows is being annoying)
+        uses: actions-rs/cargo@v1
+        if: ${{ matrix.os == 'windows-latest' }}
+        with:
+          command: clean
+
       - name: Run clippy with coconut enabled
         uses: actions-rs/cargo@v1
         if: ${{ matrix.rust != 'nightly' }}
         with:
           command: clippy
           args: --workspace --all-targets --features=coconut -- -D warnings
+
+      # nym-wallet (the rust part)
+      - name: Build nym-wallet rust code
+        uses: actions-rs/cargo@v1
+        with:
+          command: build
+          args: --manifest-path nym-wallet/Cargo.toml --workspace
+
+      - name: Run nym-wallet tests
+        uses: actions-rs/cargo@v1
+        with:
+          command: test
+          args: --manifest-path nym-wallet/Cargo.toml --workspace
+
+      - name: Check nym-wallet formatting
+        uses: actions-rs/cargo@v1
+        with:
+          command: fmt
+          args: --manifest-path nym-wallet/Cargo.toml --all -- --check
+
+      - name: Run clippy for nym-wallet
+        uses: actions-rs/cargo@v1
+        if: ${{ matrix.rust != 'nightly' }}
+        with:
+          command: clippy
+          args: --manifest-path nym-wallet/Cargo.toml --workspace --all-targets -- -D warnings
+
   notification:
     needs: build
     runs-on: ubuntu-latest

.github/workflows/nym-release-publish.yml

@@ -2,6 +2,9 @@ name: Publish Nym binaries
 on:
   release:
     types: [created]
+    
+env:
+  NETWORK: mainnet    
 
 jobs:
   publish-nym:
@@ -41,3 +44,4 @@ jobs:
             target/release/nym-mixnode
             target/release/nym-socks5-client
             target/release/nym-validator-api
+            target/release/nym-network-requester

.github/workflows/support-files/network-explorer/templates/success

@@ -1,5 +1,6 @@
 🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩🟩
 > :rocket: {{ env.NYM_PROJECT_NAME }}  ➡️➡️➡️➡️➡️ **View output:** https://{{ env.NYM_CI_WWW_LOCATION }}.{{ env.NYM_CI_WWW_BASE }}/
+> `storybook`: https://{{ env.NYM_CI_WWW_LOCATION_STORYBOOK }}.{{ env.NYM_CI_WWW_BASE }}
 > ✅ **SUCCESS**
 > `branch` {{ env.GITHUB_SERVER_URL }}/{{ env.GITHUB_REPOSITORY }}/tree/{{ env.GIT_BRANCH_NAME }}
 > `commit` {{ env.GITHUB_SERVER_URL }}/{{ env.GITHUB_REPOSITORY }}/commit/{{ env.GITHUB_SHA }}

.github/workflows/wallet.yml

@@ -0,0 +1,57 @@
+name: Nym Wallet (rust)
+
+on:
+  push:
+    paths-ignore:
+      - 'explorer/**'
+  pull_request:
+    paths-ignore:
+      - 'explorer/**'
+
+jobs:
+  build:
+    runs-on: [ self-hosted, custom-linux-exoscale ]
+    steps:
+      - name: Install Dependencies (Linux)
+        run: sudo apt-get update && sudo apt-get -y install libwebkit2gtk-4.0-dev build-essential curl wget libssl-dev libgtk-3-dev squashfs-tools
+
+      - name: Check out repository code
+        uses: actions/checkout@v2
+
+      - name: Install rust toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+          components: rustfmt, clippy
+
+      - name: Build all binaries
+        uses: actions-rs/cargo@v1
+        with:
+          command: build
+          args: --manifest-path nym-wallet/Cargo.toml --workspace
+
+      - name: Run all tests
+        uses: actions-rs/cargo@v1
+        with:
+          command: test
+          args: --manifest-path nym-wallet/Cargo.toml --workspace
+
+      - name: Check formatting
+        uses: actions-rs/cargo@v1
+        with:
+          command: fmt
+          args: --manifest-path nym-wallet/Cargo.toml --all -- --check
+
+      - uses: actions-rs/clippy-check@v1
+        name: Clippy checks
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          args: --manifest-path nym-wallet/Cargo.toml --workspace --all-features
+
+      - name: Run clippy
+        uses: actions-rs/cargo@v1
+        with:
+          command: clippy
+          args: --manifest-path nym-wallet/Cargo.toml --workspace --all-features -- -D warnings

CHANGELOG.md

@@ -1,5 +1,338 @@
 # Changelog
 
+## [Unreleased]
+
+### Added
+
+- wallet: require password to switch accounts
+- wallet: add simple CLI tool for decrypting and recovering the wallet file.
+- wallet: added support for multiple accounts ([#1265])
+- wallet: the wallet backend learned how to keep track of validator name, either hardcoded or by querying the status endpoint.
+- mixnet-contract: Replace all naked `-` with `saturating_sub`.
+- validator-api: add Swagger to document the REST API ([#1249]).
+- all: added network compilation target to `--help` (or `--version`) commands ([#1256]).
+- network-requester: send traffic statistics from all network requesters and receive it in a special network-requester that aggregates the data and exposes it via a rest API ([#1267], [#1278]).
+
+### Fixed
+
+- vesting-contract: replaced `checked_sub` with `saturating_sub` to fix the underflow in `get_vesting_tokens` ([#1275])
+- mixnet-contract: removed `expect` in `query_delegator_reward` and queries containing invalid proxy address should now return a more human-readable error ([#1257])
+- mixnet-contract: Under certain circumstances nodes could not be unbonded ([#1255](https://github.com/nymtech/nym/issues/1255)) ([#1258])
+- mixnode, gateway: attempting to determine reconnection backoff to persistently failing mixnode could result in a crash ([#1260])
+
+[#1258]: https://github.com/nymtech/nym/pull/1258
+[#1249]: https://github.com/nymtech/nym/pull/1249
+[#1256]: https://github.com/nymtech/nym/pull/1256
+[#1257]: https://github.com/nymtech/nym/pull/1257
+[#1260]: https://github.com/nymtech/nym/pull/1260
+[#1265]: https://github.com/nymtech/nym/pull/1265
+[#1267]: https://github.com/nymtech/nym/pull/1267
+[#1275]: https://github.com/nymtech/nym/pull/1275
+[#1278]: https://github.com/nymtech/nym/pull/1278
+
+## [nym-wallet-v1.0.4](https://github.com/nymtech/nym/tree/nym-wallet-v1.0.4) (2022-05-04)
+
+### Changed
+
+- all: the default behaviour of validator client is changed to use `broadcast_sync` and poll for transaction inclusion instead of using `broadcast_commit` to deal with timeouts ([#1246])
+
+## [v1.0.1](https://github.com/nymtech/nym/tree/v1.0.1) (2022-05-04)
+
+### Added
+
+- validator-api: introduced endpoint for getting average mixnode uptime ([#1238])
+
+### Changed
+
+- all: the default behaviour of validator client is changed to use `broadcast_sync` and poll for transaction inclusion instead of using `broadcast_commit` to deal with timeouts ([#1246])
+
+### Fixed
+
+- nym-network-requester: is included in the Github Actions for building release binaries
+
+[#1238]: https://github.com/nymtech/nym/pull/1238
+[#1246]: https://github.com/nymtech/nym/pull/1246
+
+## [v1.0.0](https://github.com/nymtech/nym/tree/v1.0.0) (2022-05-03)
+
+[Full Changelog](https://github.com/nymtech/nym/compare/v0.12.1...v1.0.0)
+
+**Merged pull requests:**
+
+- Feature/show pending delegations [\#1229](https://github.com/nymtech/nym/pull/1229) ([fmtabbara](https://github.com/fmtabbara))
+- Bucket inclusion probabilities [\#1224](https://github.com/nymtech/nym/pull/1224) ([durch](https://github.com/durch))
+- Create a new bundled delegation when compounding rewards [\#1221](https://github.com/nymtech/nym/pull/1221) ([durch](https://github.com/durch))
+
+## [nym-binaries-1.0.0](https://github.com/nymtech/nym/tree/nym-binaries-1.0.0) (2022-04-27)
+
+[Full Changelog](https://github.com/nymtech/nym/compare/nym-wallet-v1.0.3...nym-binaries-1.0.0)
+
+## [nym-wallet-v1.0.3](https://github.com/nymtech/nym/tree/nym-wallet-v1.0.3) (2022-04-25)
+
+[Full Changelog](https://github.com/nymtech/nym/compare/nym-binaries-1.0.0-rc.2...nym-wallet-v1.0.3)
+
+**Fixed bugs:**
+
+- \[Issue\] Wallet 1.0.2 cannot send NYM tokens from a DelayedVestingAccount [\#1215](https://github.com/nymtech/nym/issues/1215)
+- Main README not showing properly with GitHub dark mode [\#1211](https://github.com/nymtech/nym/issues/1211)
+
+**Merged pull requests:**
+
+- Bugfix - wallet undelegation for vesting accounts [\#1220](https://github.com/nymtech/nym/pull/1220) ([mmsinclair](https://github.com/mmsinclair))
+- Bugfix/delegation reconcile [\#1219](https://github.com/nymtech/nym/pull/1219) ([jstuczyn](https://github.com/jstuczyn))
+- Bugfix/query proxied pending delegations [\#1218](https://github.com/nymtech/nym/pull/1218) ([jstuczyn](https://github.com/jstuczyn))
+- Using custom gas multiplier in the wallet [\#1217](https://github.com/nymtech/nym/pull/1217) ([jstuczyn](https://github.com/jstuczyn))
+- Feature/vesting accounts support [\#1216](https://github.com/nymtech/nym/pull/1216) ([jstuczyn](https://github.com/jstuczyn))
+- Release/1.0.0 rc.2 [\#1214](https://github.com/nymtech/nym/pull/1214) ([jstuczyn](https://github.com/jstuczyn))
+- chore: fix dark mode rendering [\#1212](https://github.com/nymtech/nym/pull/1212) ([pwnfoo](https://github.com/pwnfoo))
+- Feature/spend coconut [\#1210](https://github.com/nymtech/nym/pull/1210) ([neacsu](https://github.com/neacsu))
+- Bugfix/unique sphinx key [\#1207](https://github.com/nymtech/nym/pull/1207) ([jstuczyn](https://github.com/jstuczyn))
+- Add cache read and write timeouts [\#1206](https://github.com/nymtech/nym/pull/1206) ([durch](https://github.com/durch))
+- Additional, more informative routes [\#1204](https://github.com/nymtech/nym/pull/1204) ([durch](https://github.com/durch))
+- Feature/aggregated econ dynamics explorer endpoint [\#1203](https://github.com/nymtech/nym/pull/1203) ([jstuczyn](https://github.com/jstuczyn))
+- Debugging validator [\#1198](https://github.com/nymtech/nym/pull/1198) ([durch](https://github.com/durch))
+- wallet: expose additional validator configuration functionality to the frontend [\#1195](https://github.com/nymtech/nym/pull/1195) ([octol](https://github.com/octol))
+- Update rewarding validator address [\#1193](https://github.com/nymtech/nym/pull/1193) ([durch](https://github.com/durch))
+- Crypto part of the Groth's NIDKG [\#1182](https://github.com/nymtech/nym/pull/1182) ([jstuczyn](https://github.com/jstuczyn))
+- fix unbond page [\#1180](https://github.com/nymtech/nym/pull/1180) ([tommyv1987](https://github.com/tommyv1987))
+- Type safe bounds [\#1179](https://github.com/nymtech/nym/pull/1179) ([durch](https://github.com/durch))
+- Fix delegation paging [\#1174](https://github.com/nymtech/nym/pull/1174) ([durch](https://github.com/durch))
+- Update binaries to rc version [\#1172](https://github.com/nymtech/nym/pull/1172) ([tommyv1987](https://github.com/tommyv1987))
+- Bump ansi-regex from 4.1.0 to 4.1.1 in /docker/typescript\_client/upload\_contract [\#1171](https://github.com/nymtech/nym/pull/1171) ([dependabot[bot]](https://github.com/apps/dependabot))
+
+## [nym-binaries-1.0.0-rc.2](https://github.com/nymtech/nym/tree/nym-binaries-1.0.0-rc.2) (2022-04-15)
+
+[Full Changelog](https://github.com/nymtech/nym/compare/nym-wallet-v1.0.2...nym-binaries-1.0.0-rc.2)
+
+## [nym-wallet-v1.0.2](https://github.com/nymtech/nym/tree/nym-wallet-v1.0.2) (2022-04-05)
+
+[Full Changelog](https://github.com/nymtech/nym/compare/nym-wallet-v1.0.1...nym-wallet-v1.0.2)
+
+**Merged pull requests:**
+
+- Wallet 1.0.2 visual tweaks [\#1197](https://github.com/nymtech/nym/pull/1197) ([mmsinclair](https://github.com/mmsinclair))
+- Password for wallet with routes [\#1196](https://github.com/nymtech/nym/pull/1196) ([fmtabbara](https://github.com/fmtabbara))
+- Add auto-updater to Nym Wallet [\#1194](https://github.com/nymtech/nym/pull/1194) ([mmsinclair](https://github.com/mmsinclair))
+- Fix clippy warnings for beta toolchain [\#1191](https://github.com/nymtech/nym/pull/1191) ([octol](https://github.com/octol))
+- wallet: expose validator urls to the frontend [\#1190](https://github.com/nymtech/nym/pull/1190) ([octol](https://github.com/octol))
+- wallet: add test for decrypting stored wallet file [\#1189](https://github.com/nymtech/nym/pull/1189) ([octol](https://github.com/octol))
+- Fix clippy warnings [\#1188](https://github.com/nymtech/nym/pull/1188) ([octol](https://github.com/octol))
+- Password for wallet with routes [\#1187](https://github.com/nymtech/nym/pull/1187) ([mmsinclair](https://github.com/mmsinclair))
+- wallet: add validate\_mnemonic [\#1186](https://github.com/nymtech/nym/pull/1186) ([octol](https://github.com/octol))
+- wallet: support removing accounts from the wallet file [\#1185](https://github.com/nymtech/nym/pull/1185) ([octol](https://github.com/octol))
+- Feature/adding discord [\#1184](https://github.com/nymtech/nym/pull/1184) ([gala1234](https://github.com/gala1234))
+- wallet: config backend for validator selection [\#1183](https://github.com/nymtech/nym/pull/1183) ([octol](https://github.com/octol))
+- Add storybook to wallet [\#1178](https://github.com/nymtech/nym/pull/1178) ([mmsinclair](https://github.com/mmsinclair))
+- wallet: connection test nymd and api urls independently [\#1170](https://github.com/nymtech/nym/pull/1170) ([octol](https://github.com/octol))
+- wallet: wire up account storage [\#1153](https://github.com/nymtech/nym/pull/1153) ([octol](https://github.com/octol))
+- Feature/signature on deposit [\#1151](https://github.com/nymtech/nym/pull/1151) ([neacsu](https://github.com/neacsu))
+
+## [nym-wallet-v1.0.1](https://github.com/nymtech/nym/tree/nym-wallet-v1.0.1) (2022-04-05)
+
+[Full Changelog](https://github.com/nymtech/nym/compare/nym-binaries-1.0.0-rc.1...nym-wallet-v1.0.1)
+
+**Closed issues:**
+
+- Check enabling bbbc simultaneously with open access. Estimate what it would take to make this the default compilation target. [\#1175](https://github.com/nymtech/nym/issues/1175)
+- Get coconut credential for deposited tokens [\#1138](https://github.com/nymtech/nym/issues/1138)
+- Make payments lazy [\#1135](https://github.com/nymtech/nym/issues/1135)
+- Uptime on node selection for sets [\#1049](https://github.com/nymtech/nym/issues/1049)
+
+## [nym-binaries-1.0.0-rc.1](https://github.com/nymtech/nym/tree/nym-binaries-1.0.0-rc.1) (2022-03-28)
+
+[Full Changelog](https://github.com/nymtech/nym/compare/nym-wallet-v1.0.0...nym-binaries-1.0.0-rc.1)
+
+**Fixed bugs:**
+
+- \[Issue\]cargo build --release issue [\#1101](https://github.com/nymtech/nym/issues/1101)
+- appimage fail to load in Fedora [\#1098](https://github.com/nymtech/nym/issues/1098)
+- \[Issue\] React Example project does not compile when using @nymproject/nym-client-wasm v0.9.0-1 [\#878](https://github.com/nymtech/nym/issues/878)
+
+**Closed issues:**
+
+- Make mainnet coin transfers work [\#1096](https://github.com/nymtech/nym/issues/1096)
+- Make Nym wallet validators configurable at runtime [\#1026](https://github.com/nymtech/nym/issues/1026)
+- Project Platypus e2e / integration testing [\#942](https://github.com/nymtech/nym/issues/942)
+- \[Coconut\]: Replace ElGamal with Pedersen commitments [\#901](https://github.com/nymtech/nym/issues/901)
+
+**Merged pull requests:**
+
+- Different values for mixes and gateways [\#1169](https://github.com/nymtech/nym/pull/1169) ([durch](https://github.com/durch))
+- Add global blacklist to validator-cache [\#1168](https://github.com/nymtech/nym/pull/1168) ([durch](https://github.com/durch))
+- Feature/upgrade rewarding sandbox [\#1167](https://github.com/nymtech/nym/pull/1167) ([durch](https://github.com/durch))
+- Bump node-forge from 1.2.1 to 1.3.0 [\#1165](https://github.com/nymtech/nym/pull/1165) ([dependabot[bot]](https://github.com/apps/dependabot))
+- Bump minimist from 1.2.5 to 1.2.6 in /nym-wallet/webdriver [\#1164](https://github.com/nymtech/nym/pull/1164) ([dependabot[bot]](https://github.com/apps/dependabot))
+- Bump minimist from 1.2.5 to 1.2.6 in /clients/tauri-client [\#1163](https://github.com/nymtech/nym/pull/1163) ([dependabot[bot]](https://github.com/apps/dependabot))
+- Bump minimist from 1.2.5 to 1.2.6 in /clients/webassembly/js-example [\#1162](https://github.com/nymtech/nym/pull/1162) ([dependabot[bot]](https://github.com/apps/dependabot))
+- Bump minimist from 1.2.5 to 1.2.6 in /clients/native/examples/js-examples/websocket [\#1160](https://github.com/nymtech/nym/pull/1160) ([dependabot[bot]](https://github.com/apps/dependabot))
+- Bump minimist from 1.2.5 to 1.2.6 in /docker/typescript\_client/upload\_contract [\#1159](https://github.com/nymtech/nym/pull/1159) ([dependabot[bot]](https://github.com/apps/dependabot))
+- Feature/vesting full [\#1158](https://github.com/nymtech/nym/pull/1158) ([fmtabbara](https://github.com/fmtabbara))
+- get\_current\_epoch tauri [\#1156](https://github.com/nymtech/nym/pull/1156) ([durch](https://github.com/durch))
+- Cleanup [\#1155](https://github.com/nymtech/nym/pull/1155) ([durch](https://github.com/durch))
+- Feature flag reward payments [\#1154](https://github.com/nymtech/nym/pull/1154) ([durch](https://github.com/durch))
+- Add Query endpoints for calculating rewards [\#1152](https://github.com/nymtech/nym/pull/1152) ([durch](https://github.com/durch))
+- Pending endpoints [\#1150](https://github.com/nymtech/nym/pull/1150) ([durch](https://github.com/durch))
+- wallet: add logging [\#1149](https://github.com/nymtech/nym/pull/1149) ([octol](https://github.com/octol))
+- wallet: use Urls rather than Strings for validator urls [\#1148](https://github.com/nymtech/nym/pull/1148) ([octol](https://github.com/octol))
+- Change accumulated reward to Option, migrate delegations [\#1147](https://github.com/nymtech/nym/pull/1147) ([durch](https://github.com/durch))
+- wallet: fetch validators url remotely if available [\#1146](https://github.com/nymtech/nym/pull/1146) ([octol](https://github.com/octol))
+- Fix delegated\_free calculation [\#1145](https://github.com/nymtech/nym/pull/1145) ([durch](https://github.com/durch))
+- Update Nym wallet dependencies to use `ts-packages` [\#1144](https://github.com/nymtech/nym/pull/1144) ([mmsinclair](https://github.com/mmsinclair))
+- wallet: try validators one by one if available [\#1143](https://github.com/nymtech/nym/pull/1143) ([octol](https://github.com/octol))
+- Update Network Explorer Packages and add mix node identity key copy [\#1142](https://github.com/nymtech/nym/pull/1142) ([mmsinclair](https://github.com/mmsinclair))
+- Feature/vesting token pool selector [\#1140](https://github.com/nymtech/nym/pull/1140) ([fmtabbara](https://github.com/fmtabbara))
+- Add `ts-packages` for shared Typescript packages [\#1139](https://github.com/nymtech/nym/pull/1139) ([mmsinclair](https://github.com/mmsinclair))
+- allow main-net prefix and denom to work [\#1137](https://github.com/nymtech/nym/pull/1137) ([tommyv1987](https://github.com/tommyv1987))
+- Upgrade blake3 to v1.3.1 and tauri to 1.0.0-rc.3 [\#1136](https://github.com/nymtech/nym/pull/1136) ([mmsinclair](https://github.com/mmsinclair))
+- Bump url-parse from 1.5.7 to 1.5.10 in /clients/native/examples/js-examples/websocket [\#1134](https://github.com/nymtech/nym/pull/1134) ([dependabot[bot]](https://github.com/apps/dependabot))
+- Use network explorer map data with disputed areas [\#1133](https://github.com/nymtech/nym/pull/1133) ([Baro1905](https://github.com/Baro1905))
+- Feature/vesting UI [\#1132](https://github.com/nymtech/nym/pull/1132) ([fmtabbara](https://github.com/fmtabbara))
+- Refactor to a lazy rewarding system [\#1127](https://github.com/nymtech/nym/pull/1127) ([durch](https://github.com/durch))
+- Bump ws from 6.2.1 to 6.2.2 in /clients/webassembly/js-example [\#1126](https://github.com/nymtech/nym/pull/1126) ([dependabot[bot]](https://github.com/apps/dependabot))
+- Bump url-parse from 1.4.7 to 1.5.7 in /clients/webassembly/react-example [\#1125](https://github.com/nymtech/nym/pull/1125) ([dependabot[bot]](https://github.com/apps/dependabot))
+- Bump url-parse from 1.5.4 to 1.5.7 in /clients/native/examples/js-examples/websocket [\#1124](https://github.com/nymtech/nym/pull/1124) ([dependabot[bot]](https://github.com/apps/dependabot))
+- Bump url-parse from 1.5.1 to 1.5.7 in /clients/webassembly/js-example [\#1122](https://github.com/nymtech/nym/pull/1122) ([dependabot[bot]](https://github.com/apps/dependabot))
+- update contract address [\#1121](https://github.com/nymtech/nym/pull/1121) ([tommyv1987](https://github.com/tommyv1987))
+- Refactor GitHub Actions notifications [\#1119](https://github.com/nymtech/nym/pull/1119) ([mmsinclair](https://github.com/mmsinclair))
+- Change `pledge` to `bond` in gateway list [\#1118](https://github.com/nymtech/nym/pull/1118) ([mmsinclair](https://github.com/mmsinclair))
+- Bump follow-redirects from 1.14.7 to 1.14.8 in /contracts/basic-bandwidth-generation [\#1117](https://github.com/nymtech/nym/pull/1117) ([dependabot[bot]](https://github.com/apps/dependabot))
+- Bump follow-redirects from 1.14.3 to 1.14.8 in /explorer [\#1116](https://github.com/nymtech/nym/pull/1116) ([dependabot[bot]](https://github.com/apps/dependabot))
+- Bump follow-redirects from 1.14.5 to 1.14.8 in /nym-wallet [\#1115](https://github.com/nymtech/nym/pull/1115) ([dependabot[bot]](https://github.com/apps/dependabot))
+- Bump follow-redirects from 1.14.7 to 1.14.8 in /clients/native/examples/js-examples/websocket [\#1114](https://github.com/nymtech/nym/pull/1114) ([dependabot[bot]](https://github.com/apps/dependabot))
+- Bump follow-redirects from 1.14.7 to 1.14.8 in /testnet-faucet [\#1113](https://github.com/nymtech/nym/pull/1113) ([dependabot[bot]](https://github.com/apps/dependabot))
+- Bump follow-redirects from 1.14.1 to 1.14.8 in /clients/webassembly/js-example [\#1112](https://github.com/nymtech/nym/pull/1112) ([dependabot[bot]](https://github.com/apps/dependabot))
+- Feature/vesting get current period [\#1111](https://github.com/nymtech/nym/pull/1111) ([durch](https://github.com/durch))
+- Bump simple-get from 2.8.1 to 2.8.2 in /contracts/basic-bandwidth-generation [\#1110](https://github.com/nymtech/nym/pull/1110) ([dependabot[bot]](https://github.com/apps/dependabot))
+- Bump simple-get from 3.1.0 to 3.1.1 in /explorer [\#1109](https://github.com/nymtech/nym/pull/1109) ([dependabot[bot]](https://github.com/apps/dependabot))
+- Bump simple-get from 3.1.0 to 3.1.1 in /clients/tauri-client [\#1108](https://github.com/nymtech/nym/pull/1108) ([dependabot[bot]](https://github.com/apps/dependabot))
+- Bump simple-get from 3.1.0 to 3.1.1 in /nym-wallet [\#1107](https://github.com/nymtech/nym/pull/1107) ([dependabot[bot]](https://github.com/apps/dependabot))
+- Bump node-sass from 4.14.1 to 7.0.0 in /clients/webassembly/react-example [\#1105](https://github.com/nymtech/nym/pull/1105) ([dependabot[bot]](https://github.com/apps/dependabot))
+- Fix hardcoded period logic [\#1104](https://github.com/nymtech/nym/pull/1104) ([durch](https://github.com/durch))
+- Fixed underflow in rewarding all delegators [\#1099](https://github.com/nymtech/nym/pull/1099) ([jstuczyn](https://github.com/jstuczyn))
+- Emit original bond as part of rewarding event [\#1094](https://github.com/nymtech/nym/pull/1094) ([jstuczyn](https://github.com/jstuczyn))
+- Add UpdateMixnodeConfigOnBehalf to vestng contract [\#1091](https://github.com/nymtech/nym/pull/1091) ([durch](https://github.com/durch))
+- Fixes infinite loops in requests involving pagination [\#1085](https://github.com/nymtech/nym/pull/1085) ([jstuczyn](https://github.com/jstuczyn))
+- Removes migration code [\#1071](https://github.com/nymtech/nym/pull/1071) ([jstuczyn](https://github.com/jstuczyn))
+- feature/pedersen-commitments [\#1048](https://github.com/nymtech/nym/pull/1048) ([danielementary](https://github.com/danielementary))
+- Feature/reuse init owner [\#970](https://github.com/nymtech/nym/pull/970) ([neacsu](https://github.com/neacsu))
+
+## [nym-wallet-v1.0.0](https://github.com/nymtech/nym/tree/nym-wallet-v1.0.0) (2022-02-03)
+
+[Full Changelog](https://github.com/nymtech/nym/compare/v0.12.1...nym-wallet-v1.0.0)
+
+**Implemented enhancements:**
+
+- \[Feature Request\] Please enable registration without need for Telegram account [\#1016](https://github.com/nymtech/nym/issues/1016)
+- Fast mixnode launch with a pre-built ISO + VM software [\#1001](https://github.com/nymtech/nym/issues/1001)
+
+**Fixed bugs:**
+
+- \[Issue\] [\#1000](https://github.com/nymtech/nym/issues/1000)
+- \[Issue\] `nym-client` requires multiple attempts to run a server [\#869](https://github.com/nymtech/nym/issues/869)
+- De-'float'-ing `Interval` \(`Display` impl + `serde`\) [\#1065](https://github.com/nymtech/nym/pull/1065) ([jstuczyn](https://github.com/jstuczyn))
+- display client address on wallet creation [\#1058](https://github.com/nymtech/nym/pull/1058) ([fmtabbara](https://github.com/fmtabbara))
+
+**Closed issues:**
+
+- Rewarded set inclusion probability API endpoint [\#1037](https://github.com/nymtech/nym/issues/1037)
+- Update cw-storage-plus to 0.11  [\#1032](https://github.com/nymtech/nym/issues/1032)
+- Change `u128` fields in `RewardEstimationResponse` to `u64` [\#1029](https://github.com/nymtech/nym/issues/1029)
+- Test out the mainnet Gravity Bridge [\#1006](https://github.com/nymtech/nym/issues/1006)
+- Add vesting contract interface to nym-wallet [\#959](https://github.com/nymtech/nym/issues/959)
+- Mixnode crash [\#486](https://github.com/nymtech/nym/issues/486)
+
+**Merged pull requests:**
+
+- create custom urls for mainnet [\#1095](https://github.com/nymtech/nym/pull/1095) ([fmtabbara](https://github.com/fmtabbara))
+- Wallet signing on MacOS [\#1093](https://github.com/nymtech/nym/pull/1093) ([mmsinclair](https://github.com/mmsinclair))
+- Fix rust 2018 idioms warnings [\#1092](https://github.com/nymtech/nym/pull/1092) ([octol](https://github.com/octol))
+- Prevent contract overwriting [\#1090](https://github.com/nymtech/nym/pull/1090) ([durch](https://github.com/durch))
+- Logout operation [\#1087](https://github.com/nymtech/nym/pull/1087) ([jstuczyn](https://github.com/jstuczyn))
+- Update to rust edition 2021 everywhere [\#1086](https://github.com/nymtech/nym/pull/1086) ([octol](https://github.com/octol))
+- Tag contract errors, and print out lines for easier QA [\#1084](https://github.com/nymtech/nym/pull/1084) ([durch](https://github.com/durch))
+- Feature/flexible vesting + utility queries [\#1083](https://github.com/nymtech/nym/pull/1083) ([durch](https://github.com/durch))
+- Bump @openzeppelin/contracts from 4.3.1 to 4.4.2 in /contracts/basic-bandwidth-generation [\#1082](https://github.com/nymtech/nym/pull/1082) ([dependabot[bot]](https://github.com/apps/dependabot))
+- Bump nth-check from 2.0.0 to 2.0.1 in /clients/native/examples/js-examples/websocket [\#1081](https://github.com/nymtech/nym/pull/1081) ([dependabot[bot]](https://github.com/apps/dependabot))
+- Bump url-parse from 1.5.1 to 1.5.4 in /clients/native/examples/js-examples/websocket [\#1080](https://github.com/nymtech/nym/pull/1080) ([dependabot[bot]](https://github.com/apps/dependabot))
+- Bump follow-redirects from 1.14.1 to 1.14.7 in /clients/native/examples/js-examples/websocket [\#1079](https://github.com/nymtech/nym/pull/1079) ([dependabot[bot]](https://github.com/apps/dependabot))
+- Bump nanoid from 3.1.23 to 3.2.0 in /clients/native/examples/js-examples/websocket [\#1078](https://github.com/nymtech/nym/pull/1078) ([dependabot[bot]](https://github.com/apps/dependabot))
+- Setup basic test for mixnode stats reporting [\#1077](https://github.com/nymtech/nym/pull/1077) ([octol](https://github.com/octol))
+- Make wallet\_address mandatory for mixnode init [\#1076](https://github.com/nymtech/nym/pull/1076) ([octol](https://github.com/octol))
+- Tidy nym-mixnode module visibility [\#1075](https://github.com/nymtech/nym/pull/1075) ([octol](https://github.com/octol))
+- Feature/wallet login with password [\#1074](https://github.com/nymtech/nym/pull/1074) ([fmtabbara](https://github.com/fmtabbara))
+- Add trait to mock client dependency in DelayForwarder [\#1073](https://github.com/nymtech/nym/pull/1073) ([octol](https://github.com/octol))
+- Bump rust-version to latest stable for nym-mixnode [\#1072](https://github.com/nymtech/nym/pull/1072) ([octol](https://github.com/octol))
+- Fixes CI for our wasm build [\#1069](https://github.com/nymtech/nym/pull/1069) ([jstuczyn](https://github.com/jstuczyn))
+- Add @octol as codeowner [\#1068](https://github.com/nymtech/nym/pull/1068) ([octol](https://github.com/octol))
+- set-up inclusion probability [\#1067](https://github.com/nymtech/nym/pull/1067) ([fmtabbara](https://github.com/fmtabbara))
+- Feature/wasm client [\#1066](https://github.com/nymtech/nym/pull/1066) ([neacsu](https://github.com/neacsu))
+- Changed bech32\_prefix from punk to nymt [\#1064](https://github.com/nymtech/nym/pull/1064) ([jstuczyn](https://github.com/jstuczyn))
+- Bump nanoid from 3.1.30 to 3.2.0 in /testnet-faucet [\#1063](https://github.com/nymtech/nym/pull/1063) ([dependabot[bot]](https://github.com/apps/dependabot))
+- Bump nanoid from 3.1.30 to 3.2.0 in /nym-wallet [\#1062](https://github.com/nymtech/nym/pull/1062) ([dependabot[bot]](https://github.com/apps/dependabot))
+- Rework vesting contract storage [\#1061](https://github.com/nymtech/nym/pull/1061) ([durch](https://github.com/durch))
+- Mixnet Contract constants extraction [\#1060](https://github.com/nymtech/nym/pull/1060) ([jstuczyn](https://github.com/jstuczyn))
+- fix: make explorer footer year dynamic [\#1059](https://github.com/nymtech/nym/pull/1059) ([martinyung](https://github.com/martinyung))
+- Add mnemonic just on creation, to display it [\#1057](https://github.com/nymtech/nym/pull/1057) ([neacsu](https://github.com/neacsu))
+- Network Explorer: updates to API and UI to show the active set [\#1056](https://github.com/nymtech/nym/pull/1056) ([mmsinclair](https://github.com/mmsinclair))
+- Made contract addresses for query NymdClient construction optional [\#1055](https://github.com/nymtech/nym/pull/1055) ([jstuczyn](https://github.com/jstuczyn))
+- Introduced RPC query for total token supply [\#1053](https://github.com/nymtech/nym/pull/1053) ([jstuczyn](https://github.com/jstuczyn))
+- Feature/tokio console [\#1052](https://github.com/nymtech/nym/pull/1052) ([durch](https://github.com/durch))
+- Implemented beta clippy lint recommendations [\#1051](https://github.com/nymtech/nym/pull/1051) ([jstuczyn](https://github.com/jstuczyn))
+- add new function to update profit percentage [\#1050](https://github.com/nymtech/nym/pull/1050) ([fmtabbara](https://github.com/fmtabbara))
+- Upgrade Clap and use declarative argument parsing for nym-mixnode [\#1047](https://github.com/nymtech/nym/pull/1047) ([octol](https://github.com/octol))
+- Feature/additional bond validation [\#1046](https://github.com/nymtech/nym/pull/1046) ([fmtabbara](https://github.com/fmtabbara))
+- Fix clippy on relevant lints [\#1044](https://github.com/nymtech/nym/pull/1044) ([neacsu](https://github.com/neacsu))
+- Bump shelljs from 0.8.4 to 0.8.5 in /contracts/basic-bandwidth-generation [\#1043](https://github.com/nymtech/nym/pull/1043) ([dependabot[bot]](https://github.com/apps/dependabot))
+- Endpoint for rewarded set inclusion probabilities [\#1042](https://github.com/nymtech/nym/pull/1042) ([durch](https://github.com/durch))
+- Bump follow-redirects from 1.14.4 to 1.14.7 in /contracts/basic-bandwidth-generation [\#1041](https://github.com/nymtech/nym/pull/1041) ([dependabot[bot]](https://github.com/apps/dependabot))
+- Bump follow-redirects from 1.14.5 to 1.14.7 in /testnet-faucet [\#1040](https://github.com/nymtech/nym/pull/1040) ([dependabot[bot]](https://github.com/apps/dependabot))
+- Feature/node settings update [\#1036](https://github.com/nymtech/nym/pull/1036) ([fmtabbara](https://github.com/fmtabbara))
+- Migrate to cw-storage-plus 0.11.1 [\#1035](https://github.com/nymtech/nym/pull/1035) ([durch](https://github.com/durch))
+- Bump @openzeppelin/contracts from 4.4.1 to 4.4.2 in /contracts/basic-bandwidth-generation [\#1034](https://github.com/nymtech/nym/pull/1034) ([dependabot[bot]](https://github.com/apps/dependabot))
+- Feature/configurable wallet [\#1033](https://github.com/nymtech/nym/pull/1033) ([neacsu](https://github.com/neacsu))
+- Feature/downcast reward estimation [\#1031](https://github.com/nymtech/nym/pull/1031) ([durch](https://github.com/durch))
+- Wallet UI updates [\#1028](https://github.com/nymtech/nym/pull/1028) ([fmtabbara](https://github.com/fmtabbara))
+- Remove migration code [\#1027](https://github.com/nymtech/nym/pull/1027) ([neacsu](https://github.com/neacsu))
+- Chore/stricter dependency requirements [\#1025](https://github.com/nymtech/nym/pull/1025) ([jstuczyn](https://github.com/jstuczyn))
+- Feature/validator api client endpoints [\#1024](https://github.com/nymtech/nym/pull/1024) ([jstuczyn](https://github.com/jstuczyn))
+- Updated cosmrs to 0.4.1 [\#1023](https://github.com/nymtech/nym/pull/1023) ([jstuczyn](https://github.com/jstuczyn))
+- Feature/testnet deploy scripts [\#1022](https://github.com/nymtech/nym/pull/1022) ([mfahampshire](https://github.com/mfahampshire))
+- Changed wallet's client to a full validator client [\#1021](https://github.com/nymtech/nym/pull/1021) ([jstuczyn](https://github.com/jstuczyn))
+- Fix 404 link [\#1020](https://github.com/nymtech/nym/pull/1020) ([RiccardoMasutti](https://github.com/RiccardoMasutti))
+- Feature/additional mixnode endpoints [\#1019](https://github.com/nymtech/nym/pull/1019) ([jstuczyn](https://github.com/jstuczyn))
+- Introduced denom check when trying to withdraw vested coins [\#1018](https://github.com/nymtech/nym/pull/1018) ([jstuczyn](https://github.com/jstuczyn))
+- Add network defaults for qa [\#1017](https://github.com/nymtech/nym/pull/1017) ([neacsu](https://github.com/neacsu))
+- Feature/expanded events [\#1015](https://github.com/nymtech/nym/pull/1015) ([jstuczyn](https://github.com/jstuczyn))
+- update frontend to use new profit update api [\#1014](https://github.com/nymtech/nym/pull/1014) ([fmtabbara](https://github.com/fmtabbara))
+- Feature/node state endpoint [\#1013](https://github.com/nymtech/nym/pull/1013) ([jstuczyn](https://github.com/jstuczyn))
+- Feature/hourly set updates [\#1012](https://github.com/nymtech/nym/pull/1012) ([durch](https://github.com/durch))
+- Feature/remove unused profit margin [\#1011](https://github.com/nymtech/nym/pull/1011) ([neacsu](https://github.com/neacsu))
+- Feature/explorer node status [\#1010](https://github.com/nymtech/nym/pull/1010) ([jstuczyn](https://github.com/jstuczyn))
+- Use serial integer instead of random [\#1009](https://github.com/nymtech/nym/pull/1009) ([durch](https://github.com/durch))
+- Feature/configure profit [\#1008](https://github.com/nymtech/nym/pull/1008) ([neacsu](https://github.com/neacsu))
+- Feature/fix gateway sign [\#1004](https://github.com/nymtech/nym/pull/1004) ([neacsu](https://github.com/neacsu))
+- Fix clippy [\#1003](https://github.com/nymtech/nym/pull/1003) ([neacsu](https://github.com/neacsu))
+- Update wallet version [\#998](https://github.com/nymtech/nym/pull/998) ([tommyv1987](https://github.com/tommyv1987))
+- Fix wallet build instructions [\#997](https://github.com/nymtech/nym/pull/997) ([tommyv1987](https://github.com/tommyv1987))
+- Make the separation between testnet-mode and erc20 bandwidth mode clearer [\#994](https://github.com/nymtech/nym/pull/994) ([neacsu](https://github.com/neacsu))
+- Bump @openzeppelin/contracts from 3.4.0 to 4.4.1 in /contracts/basic-bandwidth-generation [\#983](https://github.com/nymtech/nym/pull/983) ([dependabot[bot]](https://github.com/apps/dependabot))
+- Feature/implicit runtime [\#973](https://github.com/nymtech/nym/pull/973) ([jstuczyn](https://github.com/jstuczyn))
+- Differentiate staking and ownership [\#961](https://github.com/nymtech/nym/pull/961) ([durch](https://github.com/durch))
+
+## [v0.12.1](https://github.com/nymtech/nym/tree/v0.12.1) (2021-12-23)
+
+[Full Changelog](https://github.com/nymtech/nym/compare/v0.12.0...v0.12.1)
+
+**Implemented enhancements:**
+
+- Add version check to  binaries [\#967](https://github.com/nymtech/nym/issues/967)
+
+**Fixed bugs:**
+
+- \[Issue\] NYM wallet doesn't work after login [\#995](https://github.com/nymtech/nym/issues/995)
+- \[Issue\] [\#993](https://github.com/nymtech/nym/issues/993)
+- NYM wallet setup trouble\[Issue\] [\#958](https://github.com/nymtech/nym/issues/958)
+
 ## [v0.12.0](https://github.com/nymtech/nym/tree/v0.12.0) (2021-12-21)
 
 [Full Changelog](https://github.com/nymtech/nym/compare/v0.11.0...v0.12.0)
@@ -58,6 +391,7 @@
 
 **Merged pull requests:**
 
+- Update wallet to align with versioning on nodes and gateways [\#991](https://github.com/nymtech/nym/pull/991) ([tommyv1987](https://github.com/tommyv1987))
 - Fix success view messages. [\#990](https://github.com/nymtech/nym/pull/990) ([tommyv1987](https://github.com/tommyv1987))
 - Feature/enable signature check [\#989](https://github.com/nymtech/nym/pull/989) ([neacsu](https://github.com/neacsu))
 - Update mixnet contract address [\#988](https://github.com/nymtech/nym/pull/988) ([neacsu](https://github.com/neacsu))

Cargo.toml

@@ -9,6 +9,10 @@ overflow-checks = true
 [profile.dev]
 panic = "abort"
 
+[profile.test]
+# equivalent of running in `--release` (but since we're in test profile we're keeping overflow checks and all of those by default)
+opt-level = 3
+
 [workspace]
 
 resolver = "2"
@@ -18,14 +22,15 @@ members = [
     "clients/native",
     "clients/native/websocket-requests",
     "clients/socks5",
-    # "clients/tauri-client/src-tauri",
     "common/client-libs/gateway-client",
     "common/client-libs/mixnet-client",
     "common/client-libs/validator-client",
+    "common/credential-storage",
     "common/coconut-interface",
     "common/config",
     "common/credentials",
     "common/crypto",
+    "common/crypto/dkg",
     "common/bandwidth-claim-contract",
     "common/cosmwasm-smart-contracts/coconut-bandwidth-contract",
     "common/cosmwasm-smart-contracts/contracts-common",

README.md

@@ -40,36 +40,40 @@ Node, node operator and delegator rewards are determined according to the princi
 
 |Symbol|Definition|
 |---|---|
-|<img src="https://render.githubusercontent.com/render/math?math=R">|global share of rewards available, starts at 2% of the reward pool. 
-|<img src="https://render.githubusercontent.com/render/math?math=R_{i}">|node reward for mixnode `i`.
-|<img src="https://render.githubusercontent.com/render/math?math=\sigma_{i}">|ratio of total node stake (node bond + all delegations) to the token circulating supply.
-|<img src="https://render.githubusercontent.com/render/math?math=\lambda_{i}">|ratio of stake operator has pledged to their node to the token circulating supply.
-|<img src="https://render.githubusercontent.com/render/math?math=\omega_{i}">|fraction of total effort undertaken by node `i`, set to `1/k`.
-|<img src="https://render.githubusercontent.com/render/math?math=k">|number of nodes stakeholders are incentivised to create, set by the validators, a matter of governance. Currently determined by the `reward set` size, and set to 720 in testnet Sandbox.
-|<img src="https://render.githubusercontent.com/render/math?math=\alpha">|Sybil attack resistance parameter - the higher this parameter is set the stronger the reduction in competitivness gets for a Sybil attacker.
-|<img src="https://render.githubusercontent.com/render/math?math=PM_{i}">|declared profit margin of operator `i`, defaults to 10% in.
-|<img src="https://render.githubusercontent.com/render/math?math=PF_{i}">|uptime of node `i`, scaled to 0 - 1, for the rewarding epoch
-|<img src="https://render.githubusercontent.com/render/math?math=PP_{i}">|cost of operating node `i` for the duration of the rewarding eopoch, set to 40 NYMT.
+|<img src="https://render.githubusercontent.com/render/math?math=R#gh-light-mode-only"><img src="https://render.githubusercontent.com/render/math?math=\color{white}R#gh-dark-mode-only">|global share of rewards available, starts at 2% of the reward pool.
+|<img src="https://render.githubusercontent.com/render/math?math=R_{i}#gh-light-mode-only"><img src="https://render.githubusercontent.com/render/math?math=\color{white}R_{i}#gh-dark-mode-only">|node reward for mixnode `i`.
+|<img src="https://render.githubusercontent.com/render/math?math=\sigma_{i}#gh-light-mode-only"><img src="https://render.githubusercontent.com/render/math?math=\color{white}\sigma_{i}#gh-dark-mode-only">|ratio of total node stake (node bond + all delegations) to the token circulating supply.
+|<img src="https://render.githubusercontent.com/render/math?math=\lambda_{i}#gh-light-mode-only"><img src="https://render.githubusercontent.com/render/math?math=\color{white}\lambda_{i}#gh-dark-mode-only">|ratio of stake operator has pledged to their node to the token circulating supply.
+|<img src="https://render.githubusercontent.com/render/math?math=\omega_{i}#gh-light-mode-only"><img src="https://render.githubusercontent.com/render/math?math=\color{white}\omega_{i}#gh-dark-mode-only">|fraction of total effort undertaken by node `i`, set to `1/k`.
+|<img src="https://render.githubusercontent.com/render/math?math=k#gh-light-mode-only"><img src="https://render.githubusercontent.com/render/math?math=\color{white}k#gh-dark-mode-only">|number of nodes stakeholders are incentivised to create, set by the validators, a matter of governance. Currently determined by the `reward set` size, and set to 720 in testnet Sandbox.
+|<img src="https://render.githubusercontent.com/render/math?math=\alpha#gh-light-mode-only"><img src="https://render.githubusercontent.com/render/math?math=\color{white}\alpha#gh-dark-mode-only">|Sybil attack resistance parameter - the higher this parameter is set the stronger the reduction in competitivness gets for a Sybil attacker.
+|<img src="https://render.githubusercontent.com/render/math?math=PM_{i}#gh-light-mode-only"><img src="https://render.githubusercontent.com/render/math?math=\color{white}PM_{i}#gh-dark-mode-only">|declared profit margin of operator `i`, defaults to 10% in.
+|<img src="https://render.githubusercontent.com/render/math?math=PF_{i}#gh-light-mode-only"><img src="https://render.githubusercontent.com/render/math?math=\color{white}PF_{i}#gh-dark-mode-only">|uptime of node `i`, scaled to 0 - 1, for the rewarding epoch
+|<img src="https://render.githubusercontent.com/render/math?math=PP_{i}#gh-light-mode-only"><img src="https://render.githubusercontent.com/render/math?math=\color{white}PP_{i}#gh-dark-mode-only">|cost of operating node `i` for the duration of the rewarding epoch, set to 40 NYMT.
 
 Node reward for node `i` is determined as:
 
-<img src="https://render.githubusercontent.com/render/math?math=R_{i}=PF_{i} \cdot R \cdot (\sigma^'_{i} \cdot \omega_{i} \cdot k %2b \alpha \cdot \lambda^'_{i} \cdot \sigma^'_{i} \cdot k)/(1 %2b \alpha)">
-
+<img src="https://render.githubusercontent.com/render/math?math=R_{i}=PF_{i} \cdot R \cdot (\sigma^'_{i} \cdot \omega_{i} \cdot k %2b \alpha \cdot \lambda^'_{i} \cdot \sigma^'_{i} \cdot k)/(1 %2b \alpha)#gh-light-mode-only">
+<img src="https://render.githubusercontent.com/render/math?math=\color{white}R_{i}=PF_{i} \cdot R \cdot (\sigma^'_{i} \cdot \omega_{i} \cdot k %2b \alpha \cdot \lambda^'_{i} \cdot \sigma^'_{i} \cdot k)/(1 %2b \alpha)#gh-dark-mode-only">
 where:
 
-<img src="https://render.githubusercontent.com/render/math?math=\sigma^'_{i} = min\{\sigma_{i}, 1/k\}">
+<img src="https://render.githubusercontent.com/render/math?math=\sigma^'_{i} = min\{\sigma_{i}, 1/k\}#gh-light-mode-only">
+<img src="https://render.githubusercontent.com/render/math?math=\color{white}\sigma^'_{i} = min\{\sigma_{i}, 1/k\}#gh-dark-mode-only">
 
 and
 
-<img src="https://render.githubusercontent.com/render/math?math=\lambda^'_{i} = min\{\lambda_{i}, 1/k\}">
+<img src="https://render.githubusercontent.com/render/math?math=\lambda^'_{i} = min\{\lambda_{i}, 1/k\}#gh-light-mode-only">
+<img src="https://render.githubusercontent.com/render/math?math=\color{white}\lambda^'_{i} = min\{\lambda_{i}, 1/k\}#gh-dark-mode-only">
 
 Operator of node `i` is credited with the following amount:
 
-<img src="https://render.githubusercontent.com/render/math?math=min\{PP_{i},R_{i})\} %2b max\{0, (PM_{i} %2b (1 - PM_{i}) \cdot \lambda_{i}/\delta_{i}) \cdot (R_{i} - PP_{i})\}">
+<img src="https://render.githubusercontent.com/render/math?math=min\{PP_{i},R_{i})\} %2b max\{0, (PM_{i} %2b (1 - PM_{i}) \cdot \lambda_{i}/\delta_{i}) \cdot (R_{i} - PP_{i})\}#gh-light-mode-only">
+<img src="https://render.githubusercontent.com/render/math?math=\color{white}min\{PP_{i},R_{i})\} %2b max\{0, (PM_{i} %2b (1 - PM_{i}) \cdot \lambda_{i}/\delta_{i}) \cdot (R_{i} - PP_{i})\}#gh-dark-mode-only">
 
 Delegate with stake `s` recieves:
 
-<img src="https://render.githubusercontent.com/render/math?math=max\{0, (1-PM_{i}) \cdot (s^'/\sigma_{i}) \cdot (R_{i} - PP_{i})\}">
+<img src="https://render.githubusercontent.com/render/math?math=max\{0, (1-PM_{i}) \cdot (s^'/\sigma_{i}) \cdot (R_{i} - PP_{i})\}#gh-light-mode-only">
+<img src="https://render.githubusercontent.com/render/math?math=\color{white}max\{0, (1-PM_{i}) \cdot (s^'/\sigma_{i}) \cdot (R_{i} - PP_{i})\}#gh-dark-mode-only">
 
 where `s'` is stake `s` scaled over total token circulating supply.
 

SECURITY.md

@@ -0,0 +1,10 @@
+Critical bug or security issue 💥
+
+If you're here because you're trying to figure out how to notify us of a security issue, go to Discord, and alert the core engineers:
+
+    Dave Hrycyszyn futurechimp#5430
+    Drazen Urch drazen#4873
+    Jedrzej Stuczynski "Jedrzej | Nym#5666"
+
+
+Please avoid opening public issues on GitHub that contain information about a potential security vulnerability as this makes it difficult to reduce the impact and harm of valid security issues.

clients/client-core/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "client-core"
-version = "1.0.0-rc.1"
+version = "1.0.1"
 authors = ["Dave Hrycyszyn <futurechimp@users.noreply.github.com>"]
 edition = "2021"
 

clients/client-core/src/config/mod.rs

@@ -103,22 +103,15 @@ impl<T: NymConfig> Config<T> {
                 self::Client::<T>::default_reply_encryption_key_store_path(&id);
         }
 
-        #[cfg(not(feature = "coconut"))]
-        if self
-            .client
-            .backup_bandwidth_token_keys_dir
-            .as_os_str()
-            .is_empty()
-        {
-            self.client.backup_bandwidth_token_keys_dir =
-                self::Client::<T>::default_backup_bandwidth_token_keys_dir(&id);
+        if self.client.database_path.as_os_str().is_empty() {
+            self.client.database_path = self::Client::<T>::default_database_path(&id);
         }
 
         self.client.id = id;
     }
 
-    pub fn with_testnet_mode(&mut self, testnet_mode: bool) {
-        self.client.testnet_mode = testnet_mode;
+    pub fn with_disabled_credentials(&mut self, disabled_credentials_mode: bool) {
+        self.client.disabled_credentials_mode = disabled_credentials_mode;
     }
 
     pub fn with_gateway_endpoint<S: Into<String>>(&mut self, id: S, owner: S, listener: S) {
@@ -161,8 +154,8 @@ impl<T: NymConfig> Config<T> {
         self.client.id.clone()
     }
 
-    pub fn get_testnet_mode(&self) -> bool {
-        self.client.testnet_mode
+    pub fn get_disabled_credentials_mode(&self) -> bool {
+        self.client.disabled_credentials_mode
     }
 
     pub fn get_nym_root_directory(&self) -> PathBuf {
@@ -213,9 +206,8 @@ impl<T: NymConfig> Config<T> {
         self.client.gateway_endpoint.gateway_listener.clone()
     }
 
-    #[cfg(not(feature = "coconut"))]
-    pub fn get_backup_bandwidth_token_keys_dir(&self) -> PathBuf {
-        self.client.backup_bandwidth_token_keys_dir.clone()
+    pub fn get_database_path(&self) -> PathBuf {
+        self.client.database_path.clone()
     }
 
     #[cfg(not(feature = "coconut"))]
@@ -302,10 +294,10 @@ pub struct Client<T> {
     /// ID specifies the human readable ID of this particular client.
     id: String,
 
-    /// Indicates whether this client is running in a testnet mode, thus attempting
+    /// Indicates whether this client is running in a disabled credentials mode, thus attempting
     /// to claim bandwidth without presenting bandwidth credentials.
     #[serde(default)]
-    testnet_mode: bool,
+    disabled_credentials_mode: bool,
 
     /// Addresses to APIs running on validator from which the client gets the view of the network.
     validator_api_urls: Vec<Url>,
@@ -337,11 +329,8 @@ pub struct Client<T> {
     /// Information regarding how the client should send data to gateway.
     gateway_endpoint: GatewayEndpoint,
 
-    /// Path to directory containing public/private keys used for bandwidth token purchase.
-    /// Those are saved in case of emergency, to be able to reclaim bandwidth tokens.
-    /// The public key is the name of the file, while the private key is the content.
-    #[cfg(not(feature = "coconut"))]
-    backup_bandwidth_token_keys_dir: PathBuf,
+    /// Path to the database containing bandwidth credentials of this client.
+    database_path: PathBuf,
 
     /// Ethereum private key.
     #[cfg(not(feature = "coconut"))]
@@ -365,7 +354,7 @@ impl<T: NymConfig> Default for Client<T> {
         Client {
             version: env!("CARGO_PKG_VERSION").to_string(),
             id: "".to_string(),
-            testnet_mode: false,
+            disabled_credentials_mode: true,
             validator_api_urls: default_api_endpoints(),
             private_identity_key_file: Default::default(),
             public_identity_key_file: Default::default(),
@@ -375,8 +364,7 @@ impl<T: NymConfig> Default for Client<T> {
             ack_key_file: Default::default(),
             reply_encryption_key_store_path: Default::default(),
             gateway_endpoint: Default::default(),
-            #[cfg(not(feature = "coconut"))]
-            backup_bandwidth_token_keys_dir: Default::default(),
+            database_path: Default::default(),
             #[cfg(not(feature = "coconut"))]
             eth_private_key: "".to_string(),
             #[cfg(not(feature = "coconut"))]
@@ -415,10 +403,8 @@ impl<T: NymConfig> Client<T> {
     fn default_reply_encryption_key_store_path(id: &str) -> PathBuf {
         T::default_data_directory(Some(id)).join("reply_key_store")
     }
-
-    #[cfg(not(feature = "coconut"))]
-    fn default_backup_bandwidth_token_keys_dir(id: &str) -> PathBuf {
-        T::default_data_directory(Some(id)).join("backup_bandwidth_token_keys")
+    fn default_database_path(id: &str) -> PathBuf {
+        T::default_data_directory(Some(id)).join("db.sqlite")
     }
 }
 

clients/credential/Cargo.toml

@@ -20,6 +20,7 @@ tokio = { version = "1.4", features = ["rt-multi-thread", "net", "signal", "macr
 coconut-bandwidth-contract-common = { path = "../../common/cosmwasm-smart-contracts/coconut-bandwidth-contract" }
 coconut-interface = { path = "../../common/coconut-interface" }
 credentials = { path = "../../common/credentials" }
+credential-storage = { path = "../../common/credential-storage" }
 crypto = { path = "../../common/crypto", features = ["rand", "asymmetric", "symmetric", "aes", "hashing"] }
 network-defaults = { path = "../../common/network-defaults" }
 pemstore = { path = "../../common/pemstore" }

clients/credential/src/commands.rs

@@ -9,6 +9,8 @@ use std::str::FromStr;
 use url::Url;
 
 use coconut_interface::{Attribute, Base58, BlindSignRequest, Bytable, Parameters};
+use credential_storage::storage::Storage;
+use credential_storage::PersistentStorage;
 use credentials::coconut::bandwidth::{BandwidthVoucher, TOTAL_ATTRIBUTES};
 use credentials::coconut::utils::obtain_aggregate_signature;
 use crypto::asymmetric::{encryption, identity};
@@ -32,7 +34,7 @@ pub(crate) enum Commands {
 
 #[async_trait]
 pub(crate) trait Execute {
-    async fn execute(&self, db: &mut PickleDb) -> Result<()>;
+    async fn execute(&self, db: &mut PickleDb, shared_storage: PersistentStorage) -> Result<()>;
 }
 
 #[derive(Args, Clone)]
@@ -44,7 +46,7 @@ pub(crate) struct Deposit {
 
 #[async_trait]
 impl Execute for Deposit {
-    async fn execute(&self, db: &mut PickleDb) -> Result<()> {
+    async fn execute(&self, db: &mut PickleDb, _shared_storage: PersistentStorage) -> Result<()> {
         let mut rng = OsRng;
         let signing_keypair = KeyPair::from(identity::KeyPair::new(&mut rng));
         let encryption_keypair = KeyPair::from(encryption::KeyPair::new(&mut rng));
@@ -80,7 +82,7 @@ pub(crate) struct ListDeposits {}
 
 #[async_trait]
 impl Execute for ListDeposits {
-    async fn execute(&self, db: &mut PickleDb) -> Result<()> {
+    async fn execute(&self, db: &mut PickleDb, _shared_storage: PersistentStorage) -> Result<()> {
         for kv in db.iter() {
             println!("{:?}", kv.get_value::<State>());
         }
@@ -102,7 +104,7 @@ pub(crate) struct GetCredential {
 
 #[async_trait]
 impl Execute for GetCredential {
-    async fn execute(&self, db: &mut PickleDb) -> Result<()> {
+    async fn execute(&self, db: &mut PickleDb, shared_storage: PersistentStorage) -> Result<()> {
         let mut state = db
             .get::<State>(&self.tx_hash)
             .ok_or(CredentialClientError::NoDeposit)?;
@@ -162,6 +164,15 @@ impl Execute for GetCredential {
 
         let signature =
             obtain_aggregate_signature(&params, &bandwidth_credential_attributes, &urls).await?;
+        shared_storage
+            .insert_coconut_credential(
+                state.amount.to_string(),
+                VOUCHER_INFO.to_string(),
+                bandwidth_credential_attributes.get_private_attributes()[0].to_bs58(),
+                bandwidth_credential_attributes.get_private_attributes()[1].to_bs58(),
+                signature.to_bs58(),
+            )
+            .await?;
         state.signature = Some(signature.to_bs58());
         db.set(&self.tx_hash, &state).unwrap();
 
@@ -170,17 +181,3 @@ impl Execute for GetCredential {
         Ok(())
     }
 }
-
-#[derive(Args, Clone)]
-pub(crate) struct SpendCredential {
-    /// Spend one of the acquired credentials
-    #[clap(long)]
-    id: usize,
-}
-
-#[async_trait]
-impl Execute for SpendCredential {
-    async fn execute(&self, _db: &mut PickleDb) -> Result<()> {
-        Ok(())
-    }
-}

clients/credential/src/error.rs

@@ -3,6 +3,7 @@
 
 use thiserror::Error;
 
+use credential_storage::error::StorageError;
 use credentials::error::Error as CredentialError;
 use crypto::asymmetric::encryption::KeyRecoveryError;
 use crypto::asymmetric::identity::Ed25519RecoveryError;
@@ -38,4 +39,7 @@ pub enum CredentialClientError {
 
     #[error("Could not parse X25519 data")]
     X25519ParseError(#[from] KeyRecoveryError),
+
+    #[error("Could not use shared storage")]
+    SharedStorageError(#[from] StorageError),
 }

clients/credential/src/main.rs

@@ -15,9 +15,9 @@ cfg_if::cfg_if! {
         use clap::Parser;
         use pickledb::{PickleDb, PickleDbDumpPolicy, SerializationMethod};
 
-        pub const MNEMONIC: &str = "sun surge soon stomach flavor country gorilla dress oblige stamp attract hip soldier agree steel prize nuclear know enjoy arm bargain always theme matter";
+        pub const MNEMONIC: &str = "jazz fatigue diagram account outer wrist slide cherry mother grid network pause wolf pig round answer mail junior better hair dismiss toward access end";
         pub const NYMD_URL: &str = "http://127.0.0.1:26657";
-        pub const CONTRACT_ADDRESS: &str = "nymt1vhjnzk9ly03dugffvzfcwgry4dgc8x0sscmfl2";
+        pub const CONTRACT_ADDRESS: &str = "nymt1nc5tatafv6eyq7llkr2gv50ff9e22mnfp9pc5s";
         pub const SIGNER_AUTHORITIES: [&str; 1] = [
             "http://127.0.0.1:8080",
         ];
@@ -32,6 +32,8 @@ cfg_if::cfg_if! {
         #[tokio::main]
         async fn main() -> Result<()> {
             let args = Cli::parse();
+
+            let shared_storage = credential_storage::initialise_storage(std::path::PathBuf::from("/tmp/credential.db")).await;
             let mut db = match PickleDb::load(
                 "credential.db",
                 PickleDbDumpPolicy::AutoDump,
@@ -46,9 +48,9 @@ cfg_if::cfg_if! {
             };
 
             match &args.command {
-                Commands::Deposit(m) => m.execute(&mut db).await?,
-                Commands::ListDeposits(m) => m.execute(&mut db).await?,
-                Commands::GetCredential(m) => m.execute(&mut db).await?,
+                Commands::Deposit(m) => m.execute(&mut db, shared_storage).await?,
+                Commands::ListDeposits(m) => m.execute(&mut db, shared_storage).await?,
+                Commands::GetCredential(m) => m.execute(&mut db, shared_storage).await?,
             }
 
             Ok(())

clients/native/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "nym-client"
-version = "1.0.0-rc.1"
+version = "1.0.1"
 authors = ["Dave Hrycyszyn <futurechimp@users.noreply.github.com>", "Jędrzej Stuczyński <andrew@nymtech.net>"]
 edition = "2021"
 rust-version = "1.56"
@@ -34,6 +34,7 @@ tokio-tungstenite = "0.14" # websocket
 client-core = { path = "../client-core" }
 coconut-interface = { path = "../../common/coconut-interface", optional = true }
 credentials = { path = "../../common/credentials", optional = true }
+credential-storage = { path = "../../common/credential-storage" }
 config = { path = "../../common/config" }
 crypto = { path = "../../common/crypto" }
 gateway-client = { path = "../../common/client-libs/gateway-client" }
@@ -42,12 +43,12 @@ nymsphinx = { path = "../../common/nymsphinx" }
 pemstore = { path = "../../common/pemstore" }
 topology = { path = "../../common/topology" }
 websocket-requests = { path = "websocket-requests" }
-validator-client = { path = "../../common/client-libs/validator-client" }
+validator-client = { path = "../../common/client-libs/validator-client", features = ["nymd-client"] }
 version-checker = { path = "../../common/version-checker" }
 network-defaults = { path = "../../common/network-defaults" }
 
 [features]
-coconut = ["coconut-interface", "credentials", "credentials/coconut", "gateway-requests/coconut", "gateway-client/coconut"]
+coconut = ["coconut-interface", "credentials", "credentials/coconut", "gateway-requests/coconut", "gateway-client/coconut", "client-core/coconut"]
 eth = []
 
 [dev-dependencies]

clients/native/examples/js-examples/websocket/package-lock.json

@@ -592,9 +592,9 @@
       }
     },
     "node_modules/async": {
-      "version": "2.6.3",
-      "resolved": "https://registry.npmjs.org/async/-/async-2.6.3.tgz",
-      "integrity": "sha512-zflvls11DCy+dQWzTW2dzuilv8Z5X/pjfmZOWba6TNIVDm+2UDaJmXSOXlasHKfNBs8oo3M0aT50fDEWfKZjXg==",
+      "version": "2.6.4",
+      "resolved": "https://registry.npmjs.org/async/-/async-2.6.4.tgz",
+      "integrity": "sha512-mzo5dfJYwAn29PeiJ0zvwTo04zj8HDJj0Mn8TD7sno7q12prdbnasKJHhkm2c1LgrhlJ0teaea8860oxi51mGA==",
       "dev": true,
       "dependencies": {
         "lodash": "^4.17.14"
@@ -4825,9 +4825,9 @@
       "dev": true
     },
     "async": {
-      "version": "2.6.3",
-      "resolved": "https://registry.npmjs.org/async/-/async-2.6.3.tgz",
-      "integrity": "sha512-zflvls11DCy+dQWzTW2dzuilv8Z5X/pjfmZOWba6TNIVDm+2UDaJmXSOXlasHKfNBs8oo3M0aT50fDEWfKZjXg==",
+      "version": "2.6.4",
+      "resolved": "https://registry.npmjs.org/async/-/async-2.6.4.tgz",
+      "integrity": "sha512-mzo5dfJYwAn29PeiJ0zvwTo04zj8HDJj0Mn8TD7sno7q12prdbnasKJHhkm2c1LgrhlJ0teaea8860oxi51mGA==",
       "dev": true,
       "requires": {
         "lodash": "^4.17.14"

clients/native/src/client/config/template.rs

@@ -19,9 +19,9 @@ version = '{{ client.version }}'
 # Human readable ID of this particular client.
 id = '{{ client.id }}'
 
-# Indicates whether this client is running in a testnet mode, thus attempting
+# Indicates whether this client is running in a disabled credentials mode, thus attempting
 # to claim bandwidth without presenting bandwidth credentials.
-testnet_mode = {{ client.testnet_mode }}
+disabled_credentials_mode = {{ client.disabled_credentials_mode }}
 
 # Addresses to APIs running on validator from which the client gets the view of the network.
 validator_api_urls = [
@@ -46,10 +46,8 @@ public_encryption_key_file = '{{ client.public_encryption_key_file }}'
 # sent but not received back.
 reply_encryption_key_store_path = '{{ client.reply_encryption_key_store_path }}'
 
-# Path to directory containing public/private keys used for bandwidth token purchase.
-# Those are saved in case of emergency, to be able to reclaim bandwidth tokens.
-# The public key is the name of the file, while the private key is the content.
-backup_bandwidth_token_keys_dir = '{{ client.backup_bandwidth_token_keys_dir }}'
+# Path to the database containing bandwidth credentials
+database_path = '{{ client.database_path }}'
 
 # Ethereum private key.
 eth_private_key = '{{ client.eth_private_key }}'

clients/native/src/client/mod.rs

@@ -174,14 +174,16 @@ impl NymClient {
 
         #[cfg(feature = "coconut")]
         let bandwidth_controller = BandwidthController::new(
+            credential_storage::initialise_storage(self.config.get_base().get_database_path())
+                .await,
             self.config.get_base().get_validator_api_endpoints(),
-            *self.key_manager.identity_keypair().public_key(),
         );
         #[cfg(not(feature = "coconut"))]
         let bandwidth_controller = BandwidthController::new(
+            credential_storage::initialise_storage(self.config.get_base().get_database_path())
+                .await,
             self.config.get_base().get_eth_endpoint(),
             self.config.get_base().get_eth_private_key(),
-            self.config.get_base().get_backup_bandwidth_token_keys_dir(),
         )
         .expect("Could not create bandwidth controller");
 
@@ -197,8 +199,8 @@ impl NymClient {
             Some(bandwidth_controller),
         );
 
-        if self.config.get_base().get_testnet_mode() {
-            gateway_client.set_testnet_mode(true)
+        if self.config.get_base().get_disabled_credentials_mode() {
+            gateway_client.set_disabled_credentials_mode(true)
         }
         gateway_client
             .authenticate_and_start()

clients/native/src/commands/init.rs

@@ -4,21 +4,10 @@
 use clap::{App, Arg, ArgMatches};
 use client_core::client::key_manager::KeyManager;
 use client_core::config::persistence::key_pathfinder::ClientKeyPathfinder;
-#[cfg(feature = "coconut")]
-use coconut_interface::{Credential, Parameters};
 use config::NymConfig;
-#[cfg(feature = "coconut")]
-use credentials::coconut::{
-    bandwidth::prepare_for_spending, bandwidth::BandwidthVoucher, bandwidth::TOTAL_ATTRIBUTES,
-    utils::obtain_aggregate_signature,
-};
-#[cfg(feature = "coconut")]
-use credentials::obtain_aggregate_verification_key;
 use crypto::asymmetric::{encryption, identity};
 use gateway_client::GatewayClient;
 use gateway_requests::registration::handshake::SharedKeys;
-#[cfg(feature = "coconut")]
-use network_defaults::{BANDWIDTH_VALUE, VOUCHER_INFO};
 use nymsphinx::addressing::clients::Recipient;
 use nymsphinx::addressing::nodes::NodeIdentity;
 use rand::rngs::OsRng;
@@ -29,16 +18,14 @@ use std::sync::Arc;
 use std::time::Duration;
 use topology::{filter::VersionFilterable, gateway};
 use url::Url;
-#[cfg(feature = "coconut")]
-use validator_client::nymd::tx::Hash;
 
 use crate::client::config::Config;
 use crate::commands::override_config;
 #[cfg(feature = "eth")]
 #[cfg(not(feature = "coconut"))]
 use crate::commands::{
-    DEFAULT_ETH_ENDPOINT, DEFAULT_ETH_PRIVATE_KEY, ETH_ENDPOINT_ARG_NAME, ETH_PRIVATE_KEY_ARG_NAME,
-    TESTNET_MODE_ARG_NAME,
+    DEFAULT_ETH_ENDPOINT, DEFAULT_ETH_PRIVATE_KEY, ENABLED_CREDENTIALS_MODE_ARG_NAME,
+    ETH_ENDPOINT_ARG_NAME, ETH_PRIVATE_KEY_ARG_NAME,
 };
 
 pub fn command_args<'a, 'b>() -> clap::App<'a, 'b> {
@@ -79,68 +66,28 @@ pub fn command_args<'a, 'b>() -> clap::App<'a, 'b> {
     #[cfg(not(feature = "coconut"))]
         let app = app
         .arg(
-            Arg::with_name(TESTNET_MODE_ARG_NAME)
-                .long(TESTNET_MODE_ARG_NAME)
-                .help("Set this client to work in a testnet mode that would attempt to use gateway without bandwidth credential requirement. If this value is set, --eth_endpoint and --eth_private_key don't need to be set.")
+            Arg::with_name(ENABLED_CREDENTIALS_MODE_ARG_NAME)
+                .long(ENABLED_CREDENTIALS_MODE_ARG_NAME)
+                .help("Set this client to work in a disabled credentials mode that would attempt to use gateway without bandwidth credential requirement. If this value is set, --eth_endpoint and --eth_private_key don't need to be set.")
                 .conflicts_with_all(&[ETH_ENDPOINT_ARG_NAME, ETH_PRIVATE_KEY_ARG_NAME])
         )
         .arg(Arg::with_name(ETH_ENDPOINT_ARG_NAME)
             .long(ETH_ENDPOINT_ARG_NAME)
             .help("URL of an Ethereum full node that we want to use for getting bandwidth tokens from ERC20 tokens. If you don't want to set this value, use --testnet-mode instead")
             .takes_value(true)
-            .default_value_if(TESTNET_MODE_ARG_NAME, None, DEFAULT_ETH_ENDPOINT)
+            .default_value_if(ENABLED_CREDENTIALS_MODE_ARG_NAME, None, DEFAULT_ETH_ENDPOINT)
             .required(true))
         .arg(Arg::with_name(ETH_PRIVATE_KEY_ARG_NAME)
             .long(ETH_PRIVATE_KEY_ARG_NAME)
             .help("Ethereum private key used for obtaining bandwidth tokens from ERC20 tokens. If you don't want to set this value, use --testnet-mode instead")
             .takes_value(true)
-            .default_value_if(TESTNET_MODE_ARG_NAME, None, DEFAULT_ETH_PRIVATE_KEY)
+            .default_value_if(ENABLED_CREDENTIALS_MODE_ARG_NAME, None, DEFAULT_ETH_PRIVATE_KEY)
             .required(true)
         );
 
     app
 }
 
-// this behaviour should definitely be changed, we shouldn't
-// need to get bandwidth credential for registration
-#[cfg(feature = "coconut")]
-async fn _prepare_temporary_credential(validators: &[Url], raw_identity: &[u8]) -> Credential {
-    let verification_key = obtain_aggregate_verification_key(validators)
-        .await
-        .expect("could not obtain aggregate verification key of validators");
-
-    let params = Parameters::new(TOTAL_ATTRIBUTES).unwrap();
-    let mut rng = OsRng;
-    let bandwidth_credential_attributes = BandwidthVoucher::new(
-        &params,
-        BANDWIDTH_VALUE.to_string(),
-        VOUCHER_INFO.to_string(),
-        Hash::new([0; 32]),
-        // workaround for putting a valid value here, without deriving clone for the private
-        // key, until we have actual useful values
-        identity::PrivateKey::from_base58_string(
-            identity::KeyPair::new(&mut rng)
-                .private_key()
-                .to_base58_string(),
-        )
-        .unwrap(),
-        encryption::KeyPair::new(&mut rng).private_key().clone(),
-    );
-
-    let bandwidth_credential =
-        obtain_aggregate_signature(&params, &bandwidth_credential_attributes, validators)
-            .await
-            .expect("could not obtain bandwidth credential");
-
-    prepare_for_spending(
-        raw_identity,
-        &bandwidth_credential,
-        &bandwidth_credential_attributes,
-        &verification_key,
-    )
-    .expect("could not prepare out bandwidth credential for spending")
-}
-
 async fn register_with_gateway(
     gateway: &gateway::Node,
     our_identity: Arc<identity::KeyPair>,

clients/native/src/commands/mod.rs

@@ -5,7 +5,7 @@ use crate::client::config::{Config, SocketType};
 use clap::ArgMatches;
 use url::Url;
 
-pub(crate) const TESTNET_MODE_ARG_NAME: &str = "testnet-mode";
+pub(crate) const ENABLED_CREDENTIALS_MODE_ARG_NAME: &str = "enabled-credentials-mode";
 #[cfg(not(feature = "coconut"))]
 pub(crate) const ETH_ENDPOINT_ARG_NAME: &str = "eth_endpoint";
 #[cfg(not(feature = "coconut"))]
@@ -72,8 +72,8 @@ pub(crate) fn override_config(mut config: Config, matches: &ArgMatches<'_>) -> C
             .with_eth_private_key(DEFAULT_ETH_PRIVATE_KEY);
     }
 
-    if !cfg!(feature = "eth") || matches.is_present(TESTNET_MODE_ARG_NAME) {
-        config.get_base_mut().with_testnet_mode(true)
+    if matches.is_present(ENABLED_CREDENTIALS_MODE_ARG_NAME) {
+        config.get_base_mut().with_disabled_credentials(false)
     }
 
     config

clients/native/src/commands/run.rs

@@ -6,7 +6,9 @@ use crate::client::NymClient;
 use crate::commands::override_config;
 #[cfg(feature = "eth")]
 #[cfg(not(feature = "coconut"))]
-use crate::commands::{ETH_ENDPOINT_ARG_NAME, ETH_PRIVATE_KEY_ARG_NAME, TESTNET_MODE_ARG_NAME};
+use crate::commands::{
+    ENABLED_CREDENTIALS_MODE_ARG_NAME, ETH_ENDPOINT_ARG_NAME, ETH_PRIVATE_KEY_ARG_NAME,
+};
 use clap::{App, Arg, ArgMatches};
 use config::NymConfig;
 use log::*;
@@ -46,9 +48,9 @@ pub fn command_args<'a, 'b>() -> clap::App<'a, 'b> {
     #[cfg(not(feature = "coconut"))]
         let app = app
         .arg(
-            Arg::with_name(TESTNET_MODE_ARG_NAME)
-                .long(TESTNET_MODE_ARG_NAME)
-                .help("Set this client to work in a testnet mode that would attempt to use gateway without bandwidth credential requirement. If this value is set, --eth_endpoint and --eth_private_key don't need to be set.")
+            Arg::with_name(ENABLED_CREDENTIALS_MODE_ARG_NAME)
+                .long(ENABLED_CREDENTIALS_MODE_ARG_NAME)
+                .help("Set this client to work in a enabled credentials mode that would attempt to use gateway with bandwidth credential requirement. If this value is set, --eth_endpoint and --eth_private_key don't need to be set.")
                 .conflicts_with_all(&[ETH_ENDPOINT_ARG_NAME, ETH_PRIVATE_KEY_ARG_NAME])
         )
         .arg(Arg::with_name(ETH_ENDPOINT_ARG_NAME)

clients/native/src/main.rs

@@ -2,6 +2,7 @@
 // SPDX-License-Identifier: Apache-2.0
 
 use clap::{crate_version, App, ArgMatches};
+use network_defaults::DEFAULT_NETWORK;
 
 pub mod client;
 pub mod commands;
@@ -67,6 +68,7 @@ fn long_version() -> String {
 {:<20}{}
 {:<20}{}
 {:<20}{}
+{:<20}{}
 "#,
         "Build Timestamp:",
         env!("VERGEN_BUILD_TIMESTAMP"),
@@ -84,6 +86,8 @@ fn long_version() -> String {
         env!("VERGEN_RUSTC_CHANNEL"),
         "cargo Profile:",
         env!("VERGEN_CARGO_PROFILE"),
+        "Network:",
+        DEFAULT_NETWORK
     )
 }
 

clients/socks5/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "nym-socks5-client"
-version = "1.0.0-rc.1"
+version = "1.0.1"
 authors = ["Dave Hrycyszyn <futurechimp@users.noreply.github.com>"]
 edition = "2021"
 rust-version = "1.56"
@@ -27,6 +27,7 @@ url = "2.2"
 client-core = { path = "../client-core" }
 coconut-interface = { path = "../../common/coconut-interface", optional = true }
 credentials = { path = "../../common/credentials", optional = true }
+credential-storage = { path = "../../common/credential-storage" }
 config = { path = "../../common/config" }
 crypto = { path = "../../common/crypto" }
 gateway-client = { path = "../../common/client-libs/gateway-client" }
@@ -37,12 +38,12 @@ socks5-requests = { path = "../../common/socks5/requests" }
 topology = { path = "../../common/topology" }
 pemstore = { path = "../../common/pemstore" }
 proxy-helpers = { path = "../../common/socks5/proxy-helpers" }
-validator-client = { path = "../../common/client-libs/validator-client" }
+validator-client = { path = "../../common/client-libs/validator-client", features = ["nymd-client"] }
 version-checker = { path = "../../common/version-checker" }
 network-defaults = { path = "../../common/network-defaults" }
 
 [features]
-coconut = ["coconut-interface", "credentials", "gateway-requests/coconut", "gateway-client/coconut", "credentials/coconut"]
+coconut = ["coconut-interface", "credentials", "gateway-requests/coconut", "gateway-client/coconut", "credentials/coconut", "client-core/coconut"]
 eth = []
 
 [build-dependencies]

clients/socks5/src/client/config/template.rs

@@ -19,9 +19,9 @@ version = '{{ client.version }}'
 # Human readable ID of this particular client.
 id = '{{ client.id }}'
 
-# Indicates whether this client is running in a testnet mode, thus attempting
+# Indicates whether this client is running in a disabled credentials mode, thus attempting
 # to claim bandwidth without presenting bandwidth credentials.
-testnet_mode = {{ client.testnet_mode }}
+disabled_credentials_mode = {{ client.disabled_credentials_mode }}
 
 # Addresses to APIs running on validator from which the client gets the view of the network.
 validator_api_urls = [
@@ -46,10 +46,8 @@ public_encryption_key_file = '{{ client.public_encryption_key_file }}'
 # sent but not received back.
 reply_encryption_key_store_path = '{{ client.reply_encryption_key_store_path }}'
 
-# Path to directory containing public/private keys used for bandwidth token purchase.
-# Those are saved in case of emergency, to be able to reclaim bandwidth tokens.
-# The public key is the name of the file, while the private key is the content.
-backup_bandwidth_token_keys_dir = '{{ client.backup_bandwidth_token_keys_dir }}'
+# Path to the database containing bandwidth credentials
+database_path = '{{ client.database_path }}'
 
 # Ethereum private key.
 eth_private_key = '{{ client.eth_private_key }}'

clients/socks5/src/client/mod.rs

@@ -162,14 +162,16 @@ impl NymClient {
 
         #[cfg(feature = "coconut")]
         let bandwidth_controller = BandwidthController::new(
+            credential_storage::initialise_storage(self.config.get_base().get_database_path())
+                .await,
             self.config.get_base().get_validator_api_endpoints(),
-            *self.key_manager.identity_keypair().public_key(),
         );
         #[cfg(not(feature = "coconut"))]
         let bandwidth_controller = BandwidthController::new(
+            credential_storage::initialise_storage(self.config.get_base().get_database_path())
+                .await,
             self.config.get_base().get_eth_endpoint(),
             self.config.get_base().get_eth_private_key(),
-            self.config.get_base().get_backup_bandwidth_token_keys_dir(),
         )
         .expect("Could not create bandwidth controller");
 
@@ -185,8 +187,8 @@ impl NymClient {
             Some(bandwidth_controller),
         );
 
-        if self.config.get_base().get_testnet_mode() {
-            gateway_client.set_testnet_mode(true)
+        if self.config.get_base().get_disabled_credentials_mode() {
+            gateway_client.set_disabled_credentials_mode(true)
         }
         gateway_client
             .authenticate_and_start()

clients/socks5/src/commands/init.rs

@@ -4,21 +4,10 @@
 use clap::{App, Arg, ArgMatches};
 use client_core::client::key_manager::KeyManager;
 use client_core::config::persistence::key_pathfinder::ClientKeyPathfinder;
-#[cfg(feature = "coconut")]
-use coconut_interface::{Credential, Parameters};
 use config::NymConfig;
-#[cfg(feature = "coconut")]
-use credentials::coconut::{
-    bandwidth::prepare_for_spending, bandwidth::BandwidthVoucher, bandwidth::TOTAL_ATTRIBUTES,
-    utils::obtain_aggregate_signature,
-};
-#[cfg(feature = "coconut")]
-use credentials::obtain_aggregate_verification_key;
 use crypto::asymmetric::{encryption, identity};
 use gateway_client::GatewayClient;
 use gateway_requests::registration::handshake::SharedKeys;
-#[cfg(feature = "coconut")]
-use network_defaults::BANDWIDTH_VALUE;
 use nymsphinx::addressing::clients::Recipient;
 use nymsphinx::addressing::nodes::NodeIdentity;
 use rand::{prelude::SliceRandom, rngs::OsRng, thread_rng};
@@ -27,16 +16,14 @@ use std::sync::Arc;
 use std::time::Duration;
 use topology::{filter::VersionFilterable, gateway};
 use url::Url;
-#[cfg(feature = "coconut")]
-use validator_client::nymd::tx::Hash;
 
 use crate::client::config::Config;
 use crate::commands::override_config;
 #[cfg(feature = "eth")]
 #[cfg(not(feature = "coconut"))]
 use crate::commands::{
-    DEFAULT_ETH_ENDPOINT, DEFAULT_ETH_PRIVATE_KEY, ETH_ENDPOINT_ARG_NAME, ETH_PRIVATE_KEY_ARG_NAME,
-    TESTNET_MODE_ARG_NAME,
+    DEFAULT_ETH_ENDPOINT, DEFAULT_ETH_PRIVATE_KEY, ENABLED_CREDENTIALS_MODE_ARG_NAME,
+    ETH_ENDPOINT_ARG_NAME, ETH_PRIVATE_KEY_ARG_NAME,
 };
 
 pub fn command_args<'a, 'b>() -> clap::App<'a, 'b> {
@@ -79,68 +66,28 @@ pub fn command_args<'a, 'b>() -> clap::App<'a, 'b> {
     #[cfg(not(feature = "coconut"))]
         let app = app
         .arg(
-            Arg::with_name(TESTNET_MODE_ARG_NAME)
-                .long(TESTNET_MODE_ARG_NAME)
-                .help("Set this client to work in a testnet mode that would attempt to use gateway without bandwidth credential requirement. If this value is set, --eth_endpoint and --eth_private_key don't need to be set.")
+            Arg::with_name(ENABLED_CREDENTIALS_MODE_ARG_NAME)
+                .long(ENABLED_CREDENTIALS_MODE_ARG_NAME)
+                .help("Set this client to work in a enabled credentials mode that would attempt to use gateway with bandwidth credential requirement. If this value is set, --eth_endpoint and --eth_private_key don't need to be set.")
                 .conflicts_with_all(&[ETH_ENDPOINT_ARG_NAME, ETH_PRIVATE_KEY_ARG_NAME])
         )
         .arg(Arg::with_name(ETH_ENDPOINT_ARG_NAME)
             .long(ETH_ENDPOINT_ARG_NAME)
             .help("URL of an Ethereum full node that we want to use for getting bandwidth tokens from ERC20 tokens. If you don't want to set this value, use --testnet-mode instead")
             .takes_value(true)
-            .default_value_if(TESTNET_MODE_ARG_NAME, None, DEFAULT_ETH_ENDPOINT)
+            .default_value_if(ENABLED_CREDENTIALS_MODE_ARG_NAME, None, DEFAULT_ETH_ENDPOINT)
             .required(true))
         .arg(Arg::with_name(ETH_PRIVATE_KEY_ARG_NAME)
             .long(ETH_PRIVATE_KEY_ARG_NAME)
             .help("Ethereum private key used for obtaining bandwidth tokens from ERC20 tokens. If you don't want to set this value, use --testnet-mode instead")
             .takes_value(true)
-            .default_value_if(TESTNET_MODE_ARG_NAME, None, DEFAULT_ETH_PRIVATE_KEY)
+            .default_value_if(ENABLED_CREDENTIALS_MODE_ARG_NAME, None, DEFAULT_ETH_PRIVATE_KEY)
             .required(true)
         );
 
     app
 }
 
-// this behaviour should definitely be changed, we shouldn't
-// need to get bandwidth credential for registration
-#[cfg(feature = "coconut")]
-async fn _prepare_temporary_credential(validators: &[Url], raw_identity: &[u8]) -> Credential {
-    let verification_key = obtain_aggregate_verification_key(validators)
-        .await
-        .expect("could not obtain aggregate verification key of validators");
-
-    let params = Parameters::new(TOTAL_ATTRIBUTES).unwrap();
-    let mut rng = OsRng;
-    let bandwidth_credential_attributes = BandwidthVoucher::new(
-        &params,
-        BANDWIDTH_VALUE.to_string(),
-        network_defaults::VOUCHER_INFO.to_string(),
-        Hash::new([0; 32]),
-        // workaround for putting a valid value here, without deriving clone for the private
-        // key, until we have actual useful values
-        identity::PrivateKey::from_base58_string(
-            identity::KeyPair::new(&mut rng)
-                .private_key()
-                .to_base58_string(),
-        )
-        .unwrap(),
-        encryption::KeyPair::new(&mut rng).private_key().clone(),
-    );
-
-    let bandwidth_credential =
-        obtain_aggregate_signature(&params, &bandwidth_credential_attributes, validators)
-            .await
-            .expect("could not obtain bandwidth credential");
-
-    prepare_for_spending(
-        raw_identity,
-        &bandwidth_credential,
-        &bandwidth_credential_attributes,
-        &verification_key,
-    )
-    .expect("could not prepare out bandwidth credential for spending")
-}
-
 async fn register_with_gateway(
     gateway: &gateway::Node,
     our_identity: Arc<identity::KeyPair>,

clients/socks5/src/commands/mod.rs

@@ -9,7 +9,7 @@ pub(crate) mod init;
 pub(crate) mod run;
 pub(crate) mod upgrade;
 
-pub(crate) const TESTNET_MODE_ARG_NAME: &str = "testnet-mode";
+pub(crate) const ENABLED_CREDENTIALS_MODE_ARG_NAME: &str = "enabled-credentials-mode";
 #[cfg(not(feature = "coconut"))]
 pub(crate) const ETH_ENDPOINT_ARG_NAME: &str = "eth_endpoint";
 #[cfg(not(feature = "coconut"))]
@@ -68,8 +68,8 @@ pub(crate) fn override_config(mut config: Config, matches: &ArgMatches<'_>) -> C
             .with_eth_private_key(DEFAULT_ETH_PRIVATE_KEY);
     }
 
-    if !cfg!(feature = "eth") || matches.is_present(TESTNET_MODE_ARG_NAME) {
-        config.get_base_mut().with_testnet_mode(true)
+    if matches.is_present(ENABLED_CREDENTIALS_MODE_ARG_NAME) {
+        config.get_base_mut().with_disabled_credentials(false)
     }
 
     config

clients/socks5/src/commands/run.rs

@@ -6,7 +6,9 @@ use crate::client::NymClient;
 use crate::commands::override_config;
 #[cfg(feature = "eth")]
 #[cfg(not(feature = "coconut"))]
-use crate::commands::{ETH_ENDPOINT_ARG_NAME, ETH_PRIVATE_KEY_ARG_NAME, TESTNET_MODE_ARG_NAME};
+use crate::commands::{
+    ENABLED_CREDENTIALS_MODE_ARG_NAME, ETH_ENDPOINT_ARG_NAME, ETH_PRIVATE_KEY_ARG_NAME,
+};
 use clap::{App, Arg, ArgMatches};
 use config::NymConfig;
 use log::*;
@@ -52,9 +54,9 @@ pub fn command_args<'a, 'b>() -> clap::App<'a, 'b> {
     #[cfg(not(feature = "coconut"))]
     let app = app
         .arg(
-            Arg::with_name(TESTNET_MODE_ARG_NAME)
-                .long(TESTNET_MODE_ARG_NAME)
-                .help("Set this client to work in a testnet mode that would attempt to use gateway without bandwidth credential requirement. If this value is set, --eth_endpoint and --eth_private_key don't need to be set.")
+            Arg::with_name(ENABLED_CREDENTIALS_MODE_ARG_NAME)
+                .long(ENABLED_CREDENTIALS_MODE_ARG_NAME)
+                .help("Set this client to work in a disabled credentials mode that would attempt to use gateway without bandwidth credential requirement. If this value is set, --eth_endpoint and --eth_private_key don't need to be set.")
                 .conflicts_with_all(&[ETH_ENDPOINT_ARG_NAME, ETH_PRIVATE_KEY_ARG_NAME])
         )
         .arg(Arg::with_name(ETH_ENDPOINT_ARG_NAME)

clients/socks5/src/main.rs

@@ -2,6 +2,7 @@
 // SPDX-License-Identifier: Apache-2.0
 
 use clap::{crate_version, App, ArgMatches};
+use network_defaults::DEFAULT_NETWORK;
 
 pub mod client;
 mod commands;
@@ -67,6 +68,7 @@ fn long_version() -> String {
 {:<20}{}
 {:<20}{}
 {:<20}{}
+{:<20}{}
 "#,
         "Build Timestamp:",
         env!("VERGEN_BUILD_TIMESTAMP"),
@@ -84,6 +86,8 @@ fn long_version() -> String {
         env!("VERGEN_RUSTC_CHANNEL"),
         "cargo Profile:",
         env!("VERGEN_CARGO_PROFILE"),
+        "Network:",
+        DEFAULT_NETWORK
     )
 }
 

clients/socks5/src/socks/client.rs

@@ -16,7 +16,7 @@ use proxy_helpers::connection_controller::{
 };
 use proxy_helpers::proxy_runner::ProxyRunner;
 use rand::RngCore;
-use socks5_requests::{ConnectionId, RemoteAddress, Request};
+use socks5_requests::{ConnectionId, Message, RemoteAddress, Request};
 use std::io;
 use std::net::SocketAddr;
 use std::pin::Pin;
@@ -224,8 +224,9 @@ impl SocksClient {
 
     async fn send_connect_to_mixnet(&mut self, remote_address: RemoteAddress) {
         let req = Request::new_connect(self.connection_id, remote_address, self.self_address);
+        let msg = Message::Request(req);
 
-        let input_message = InputMessage::new_fresh(self.service_provider, req.into_bytes(), false);
+        let input_message = InputMessage::new_fresh(self.service_provider, msg.into_bytes(), false);
         self.input_sender.unbounded_send(input_message).unwrap();
     }
 
@@ -252,7 +253,8 @@ impl SocksClient {
         )
         .run(move |conn_id, read_data, socket_closed| {
             let provider_request = Request::new_send(conn_id, read_data, socket_closed);
-            InputMessage::new_fresh(recipient, provider_request.into_bytes(), false)
+            let provider_message = Message::Request(provider_request);
+            InputMessage::new_fresh(recipient, provider_message.into_bytes(), false)
         })
         .await
         .into_inner();

clients/webassembly/Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "nym-client-wasm"
 authors = ["Dave Hrycyszyn <futurechimp@users.noreply.github.com>", "Jedrzej Stuczynski <andrew@nymtech.net>"]
-version = "1.0.0-rc.1"
+version = "1.0.1"
 edition = "2021"
 keywords = ["nym", "sphinx", "wasm", "webassembly", "privacy", "client"]
 license = "Apache-2.0"

clients/webassembly/js-example/package-lock.json

@@ -24,8 +24,7 @@
     },
     "../pkg": {
       "name": "@nymproject/nym-client-wasm",
-      "version": "0.12.0",
-      "license": "Apache-2.0"
+      "version": "0.0.1"
     },
     "node_modules/@discoveryjs/json-ext": {
       "version": "0.5.7",
@@ -586,9 +585,9 @@
       }
     },
     "node_modules/async": {
-      "version": "2.6.3",
-      "resolved": "https://registry.npmjs.org/async/-/async-2.6.3.tgz",
-      "integrity": "sha512-zflvls11DCy+dQWzTW2dzuilv8Z5X/pjfmZOWba6TNIVDm+2UDaJmXSOXlasHKfNBs8oo3M0aT50fDEWfKZjXg==",
+      "version": "2.6.4",
+      "resolved": "https://registry.npmjs.org/async/-/async-2.6.4.tgz",
+      "integrity": "sha512-mzo5dfJYwAn29PeiJ0zvwTo04zj8HDJj0Mn8TD7sno7q12prdbnasKJHhkm2c1LgrhlJ0teaea8860oxi51mGA==",
       "dev": true,
       "dependencies": {
         "lodash": "^4.17.14"
@@ -4305,9 +4304,9 @@
       "dev": true
     },
     "async": {
-      "version": "2.6.3",
-      "resolved": "https://registry.npmjs.org/async/-/async-2.6.3.tgz",
-      "integrity": "sha512-zflvls11DCy+dQWzTW2dzuilv8Z5X/pjfmZOWba6TNIVDm+2UDaJmXSOXlasHKfNBs8oo3M0aT50fDEWfKZjXg==",
+      "version": "2.6.4",
+      "resolved": "https://registry.npmjs.org/async/-/async-2.6.4.tgz",
+      "integrity": "sha512-mzo5dfJYwAn29PeiJ0zvwTo04zj8HDJj0Mn8TD7sno7q12prdbnasKJHhkm2c1LgrhlJ0teaea8860oxi51mGA==",
       "dev": true,
       "requires": {
         "lodash": "^4.17.14"

clients/webassembly/src/client/mod.rs

@@ -26,7 +26,7 @@ const DEFAULT_GATEWAY_RESPONSE_TIMEOUT: Duration = Duration::from_millis(1_500);
 #[wasm_bindgen]
 pub struct NymClient {
     validator_server: Url,
-    testnet_mode: bool,
+    disabled_credentials_mode: bool,
 
     // TODO: technically this doesn't need to be an Arc since wasm is run on a single thread
     // however, once we eventually combine this code with the native-client's, it will make things
@@ -72,7 +72,7 @@ impl NymClient {
 
             on_message: None,
             on_gateway_connect: None,
-            testnet_mode: true,
+            disabled_credentials_mode: true,
         }
     }
 
@@ -85,9 +85,12 @@ impl NymClient {
         self.on_gateway_connect = Some(on_connect)
     }
 
-    pub fn set_testnet_mode(&mut self, testnet_mode: bool) {
-        console_log!("Setting testnet mode to {}", testnet_mode);
-        self.testnet_mode = testnet_mode;
+    pub fn set_disabled_credentials_mode(&mut self, disabled_credentials_mode: bool) {
+        console_log!(
+            "Setting disabled credentials mode to {}",
+            disabled_credentials_mode
+        );
+        self.disabled_credentials_mode = disabled_credentials_mode;
     }
 
     fn self_recipient(&self) -> Recipient {
@@ -107,14 +110,8 @@ impl NymClient {
 
     // Right now it's impossible to have async exported functions to take `&self` rather than self
     pub async fn initial_setup(self) -> Self {
-        let testnet_mode = self.testnet_mode;
+        let disabled_credentials_mode = self.disabled_credentials_mode;
 
-        #[cfg(feature = "coconut")]
-        let bandwidth_controller = Some(gateway_client::bandwidth::BandwidthController::new(
-            vec![self.validator_server.clone()],
-            *self.identity.public_key(),
-        ));
-        #[cfg(not(feature = "coconut"))]
         let bandwidth_controller = None;
 
         let mut client = self.get_and_update_topology().await;
@@ -135,8 +132,8 @@ impl NymClient {
             bandwidth_controller,
         );
 
-        if testnet_mode {
-            gateway_client.set_testnet_mode(true)
+        if disabled_credentials_mode {
+            gateway_client.set_disabled_credentials_mode(true)
         }
 
         gateway_client

common/client-libs/gateway-client/Cargo.toml

@@ -17,9 +17,9 @@ url = "2.2"
 rand = { version = "0.7.3", features = ["wasm-bindgen"] }
 secp256k1 = "0.20.3"
 web3 = { version = "0.17.0", default-features = false }
+async-trait = { version = "0.1.51" }
 
 # internal
-cosmrs = { version = "0.4.1", optional = true }
 credentials = { path = "../../credentials" }
 crypto = { path = "../../crypto" }
 gateway-requests = { path = "../../../gateway/gateway-requests" }
@@ -41,6 +41,9 @@ features = ["macros", "rt", "net", "sync", "time"]
 [target."cfg(not(target_arch = \"wasm32\"))".dependencies.tokio-tungstenite]
 version = "0.14"
 
+[target."cfg(not(target_arch = \"wasm32\"))".dependencies.credential-storage]
+path = "../../credential-storage"
+
 # wasm-only dependencies
 [target."cfg(target_arch = \"wasm32\")".dependencies.wasm-bindgen]
 version = "0.2"
@@ -69,6 +72,6 @@ features = ["js"]
 #url = "2.1"
 
 [features]
-coconut = ["gateway-requests/coconut", "coconut-interface", "validator-client", "credentials/coconut", "cosmrs"]
+coconut = ["gateway-requests/coconut", "coconut-interface", "validator-client", "credentials/coconut"]
 wasm = ["web3/wasm", "web3/http", "web3/signing"]
 default = ["web3/default"]

common/client-libs/gateway-client/src/bandwidth.rs

@@ -1,33 +1,35 @@
 // Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
 // SPDX-License-Identifier: Apache-2.0
 
+#[cfg(target_arch = "wasm32")]
+use crate::wasm_storage::{Storage, StorageError};
 #[cfg(feature = "coconut")]
-use cosmrs::tx::Hash;
+use coconut_interface::Base58;
+#[cfg(feature = "coconut")]
+#[cfg(not(target_arch = "wasm32"))]
+use credential_storage::error::StorageError;
+#[cfg(not(target_arch = "wasm32"))]
+use credential_storage::storage::Storage;
 #[cfg(feature = "coconut")]
 use credentials::coconut::{
-    bandwidth::{prepare_for_spending, BandwidthVoucher, TOTAL_ATTRIBUTES},
-    utils::{obtain_aggregate_signature, obtain_aggregate_verification_key},
+    bandwidth::prepare_for_spending, utils::obtain_aggregate_verification_key,
 };
 #[cfg(not(feature = "coconut"))]
 use credentials::token::bandwidth::TokenCredential;
-#[cfg(feature = "coconut")]
-use crypto::asymmetric::encryption;
+#[cfg(not(feature = "coconut"))]
 use crypto::asymmetric::identity;
-use network_defaults::BANDWIDTH_VALUE;
 #[cfg(not(feature = "coconut"))]
 use network_defaults::{
-    eth_contract::ETH_ERC20_JSON_ABI, eth_contract::ETH_JSON_ABI, ETH_BURN_FUNCTION_NAME,
-    ETH_CONTRACT_ADDRESS, ETH_ERC20_APPROVE_FUNCTION_NAME, ETH_ERC20_CONTRACT_ADDRESS,
-    ETH_MIN_BLOCK_DEPTH, TOKENS_TO_BURN, UTOKENS_TO_BURN,
+    eth_contract::ETH_ERC20_JSON_ABI, eth_contract::ETH_JSON_ABI, BANDWIDTH_VALUE,
+    ETH_BURN_FUNCTION_NAME, ETH_CONTRACT_ADDRESS, ETH_ERC20_APPROVE_FUNCTION_NAME,
+    ETH_ERC20_CONTRACT_ADDRESS, ETH_MIN_BLOCK_DEPTH, TOKENS_TO_BURN, UTOKENS_TO_BURN,
 };
 #[cfg(not(feature = "coconut"))]
 use pemstore::traits::PemStorableKeyPair;
+#[cfg(not(feature = "coconut"))]
 use rand::rngs::OsRng;
 #[cfg(not(feature = "coconut"))]
 use secp256k1::SecretKey;
-#[cfg(not(feature = "coconut"))]
-use std::io::{Read, Write};
-#[cfg(not(feature = "coconut"))]
 use std::str::FromStr;
 #[cfg(not(feature = "coconut"))]
 use web3::{
@@ -68,35 +70,35 @@ pub fn eth_erc20_contract(web3: Web3<Http>) -> Contract<Http> {
 }
 
 #[derive(Clone)]
-pub struct BandwidthController {
+pub struct BandwidthController<St: Storage> {
+    storage: St,
     #[cfg(feature = "coconut")]
     validator_endpoints: Vec<url::Url>,
-    #[cfg(feature = "coconut")]
-    identity: identity::PublicKey,
     #[cfg(not(feature = "coconut"))]
     contract: Contract<Http>,
     #[cfg(not(feature = "coconut"))]
     erc20_contract: Contract<Http>,
     #[cfg(not(feature = "coconut"))]
     eth_private_key: SecretKey,
-    #[cfg(not(feature = "coconut"))]
-    backup_bandwidth_token_keys_dir: std::path::PathBuf,
 }
 
-impl BandwidthController {
+impl<St> BandwidthController<St>
+where
+    St: Storage + Clone + 'static,
+{
     #[cfg(feature = "coconut")]
-    pub fn new(validator_endpoints: Vec<url::Url>, identity: identity::PublicKey) -> Self {
+    pub fn new(storage: St, validator_endpoints: Vec<url::Url>) -> Self {
         BandwidthController {
+            storage,
             validator_endpoints,
-            identity,
         }
     }
 
     #[cfg(not(feature = "coconut"))]
     pub fn new(
+        storage: St,
         eth_endpoint: String,
         eth_private_key: String,
-        backup_bandwidth_token_keys_dir: std::path::PathBuf,
     ) -> Result<Self, GatewayClientError> {
         // Fail early, on invalid url
         let transport =
@@ -109,60 +111,42 @@ impl BandwidthController {
             .map_err(|_| GatewayClientError::InvalidEthereumPrivateKey)?;
 
         Ok(BandwidthController {
+            storage,
             contract,
             erc20_contract,
             eth_private_key,
-            backup_bandwidth_token_keys_dir,
         })
     }
 
     #[cfg(not(feature = "coconut"))]
-    fn backup_keypair(&self, keypair: &identity::KeyPair) -> Result<(), GatewayClientError> {
-        std::fs::create_dir_all(&self.backup_bandwidth_token_keys_dir)?;
-        let file_path = self
-            .backup_bandwidth_token_keys_dir
-            .join(keypair.public_key().to_base58_string());
-        let mut file = std::fs::File::create(file_path)?;
-        file.write_all(&keypair.private_key().to_bytes())?;
+    async fn backup_keypair(&self, keypair: &identity::KeyPair) -> Result<(), GatewayClientError> {
+        self.storage
+            .insert_erc20_credential(
+                keypair.public_key().to_base58_string(),
+                keypair.private_key().to_base58_string(),
+            )
+            .await?;
 
         Ok(())
     }
 
     #[cfg(not(feature = "coconut"))]
-    fn restore_keypair(&self) -> Result<identity::KeyPair, GatewayClientError> {
-        std::fs::create_dir_all(&self.backup_bandwidth_token_keys_dir)?;
-        let file = std::fs::read_dir(&self.backup_bandwidth_token_keys_dir)?
-            .find(|entry| {
-                entry
-                    .as_ref()
-                    .map(|entry| entry.path().is_file())
-                    .unwrap_or(false)
-            })
-            .unwrap_or_else(|| Err(std::io::Error::from(std::io::ErrorKind::NotFound)))?;
-        let file_path = file.path();
-        let pub_key = file_path
-            .file_name()
-            .ok_or_else(|| std::io::Error::from(std::io::ErrorKind::NotFound))?
-            .to_str()
-            .ok_or_else(|| std::io::Error::from(std::io::ErrorKind::NotFound))?;
-        let mut priv_key = vec![];
-        std::fs::File::open(file_path.clone())?.read_to_end(&mut priv_key)?;
-        Ok(identity::KeyPair::from_keys(
-            identity::PrivateKey::from_bytes(&priv_key).unwrap(),
-            identity::PublicKey::from_base58_string(pub_key).unwrap(),
-        ))
+    async fn restore_keypair(&self) -> Result<identity::KeyPair, GatewayClientError> {
+        let data = self.storage.get_next_erc20_credential().await?;
+        let public_key = identity::PublicKey::from_base58_string(data.public_key).unwrap();
+        let private_key = identity::PrivateKey::from_base58_string(data.private_key).unwrap();
+
+        Ok(identity::KeyPair::from_keys(private_key, public_key))
     }
 
     #[cfg(not(feature = "coconut"))]
-    fn mark_keypair_as_spent(&self, keypair: &identity::KeyPair) -> Result<(), GatewayClientError> {
-        let mut spent_dir = self.backup_bandwidth_token_keys_dir.clone();
-        spent_dir.push("spent");
-        std::fs::create_dir_all(&spent_dir)?;
-        let file_path_old = self
-            .backup_bandwidth_token_keys_dir
-            .join(keypair.public_key().to_base58_string());
-        let file_path_new = spent_dir.join(keypair.public_key().to_base58_string());
-        std::fs::rename(file_path_old, file_path_new)?;
+    async fn mark_keypair_as_spent(
+        &self,
+        keypair: &identity::KeyPair,
+    ) -> Result<(), GatewayClientError> {
+        self.storage
+            .consume_erc20_credential(keypair.public_key().to_base58_string())
+            .await?;
 
         Ok(())
     }
@@ -172,39 +156,24 @@ impl BandwidthController {
         &self,
     ) -> Result<coconut_interface::Credential, GatewayClientError> {
         let verification_key = obtain_aggregate_verification_key(&self.validator_endpoints).await?;
-        let params = coconut_interface::Parameters::new(TOTAL_ATTRIBUTES).unwrap();
-
-        let mut rng = OsRng;
-        // TODO: Decide what is the value and additional info associated with the bandwidth voucher
-        let bandwidth_credential_attributes = BandwidthVoucher::new(
-            &params,
-            BANDWIDTH_VALUE.to_string(),
-            network_defaults::VOUCHER_INFO.to_string(),
-            Hash::new([0; 32]),
-            // workaround for putting a valid value here, without deriving clone for the private
-            // key, until we have actual useful values
-            identity::PrivateKey::from_base58_string(
-                identity::KeyPair::new(&mut rng)
-                    .private_key()
-                    .to_base58_string(),
-            )
-            .unwrap(),
-            encryption::KeyPair::new(&mut rng).private_key().clone(),
-        );
-
-        let bandwidth_credential = obtain_aggregate_signature(
-            &params,
-            &bandwidth_credential_attributes,
-            &self.validator_endpoints,
-        )
-        .await?;
-        // the above would presumably be loaded from a file
+        let bandwidth_credential = self.storage.get_next_coconut_credential().await?;
+        let voucher_value = u64::from_str(&bandwidth_credential.voucher_value)
+            .map_err(|_| StorageError::InconsistentData)?;
+        let voucher_info = bandwidth_credential.voucher_info.clone();
+        let serial_number =
+            coconut_interface::Attribute::try_from_bs58(bandwidth_credential.serial_number)?;
+        let binding_number =
+            coconut_interface::Attribute::try_from_bs58(bandwidth_credential.binding_number)?;
+        let signature =
+            coconut_interface::Signature::try_from_bs58(bandwidth_credential.signature)?;
 
         // the below would only be executed once we know where we want to spend it (i.e. which gateway and stuff)
         Ok(prepare_for_spending(
-            &self.identity.to_bytes(),
-            &bandwidth_credential,
-            &bandwidth_credential_attributes,
+            voucher_value,
+            voucher_info,
+            serial_number,
+            binding_number,
+            &signature,
             &verification_key,
         )?)
     }
@@ -215,12 +184,12 @@ impl BandwidthController {
         gateway_identity: identity::PublicKey,
         gateway_owner: String,
     ) -> Result<TokenCredential, GatewayClientError> {
-        let kp = match self.restore_keypair() {
+        let kp = match self.restore_keypair().await {
             Ok(kp) => kp,
             Err(_) => {
                 let mut rng = OsRng;
                 let kp = identity::KeyPair::new(&mut rng);
-                self.backup_keypair(&kp)?;
+                self.backup_keypair(&kp).await?;
                 kp
             }
         };
@@ -230,7 +199,7 @@ impl BandwidthController {
         self.buy_token_credential(verification_key, signed_verification_key, gateway_owner)
             .await?;
 
-        self.mark_keypair_as_spent(&kp)?;
+        self.mark_keypair_as_spent(&kp).await?;
 
         let message: Vec<u8> = verification_key
             .to_bytes()

common/client-libs/gateway-client/src/client.rs

@@ -9,8 +9,12 @@ pub use crate::packet_router::{
     AcknowledgementReceiver, AcknowledgementSender, MixnetMessageReceiver, MixnetMessageSender,
 };
 use crate::socket_state::{PartiallyDelegated, SocketState};
+#[cfg(target_arch = "wasm32")]
+use crate::wasm_storage::PersistentStorage;
 #[cfg(feature = "coconut")]
 use coconut_interface::Credential;
+#[cfg(not(target_arch = "wasm32"))]
+use credential_storage::PersistentStorage;
 #[cfg(not(feature = "coconut"))]
 use credentials::token::bandwidth::TokenCredential;
 use crypto::asymmetric::identity;
@@ -41,7 +45,7 @@ const DEFAULT_RECONNECTION_BACKOFF: Duration = Duration::from_secs(5);
 
 pub struct GatewayClient {
     authenticated: bool,
-    testnet_mode: bool,
+    disabled_credentials_mode: bool,
     bandwidth_remaining: i64,
     gateway_address: String,
     gateway_identity: identity::PublicKey,
@@ -51,7 +55,7 @@ pub struct GatewayClient {
     connection: SocketState,
     packet_router: PacketRouter,
     response_timeout_duration: Duration,
-    bandwidth_controller: Option<BandwidthController>,
+    bandwidth_controller: Option<BandwidthController<PersistentStorage>>,
 
     // reconnection related variables
     /// Specifies whether client should try to reconnect to gateway on connection failure.
@@ -75,11 +79,11 @@ impl GatewayClient {
         mixnet_message_sender: MixnetMessageSender,
         ack_sender: AcknowledgementSender,
         response_timeout_duration: Duration,
-        bandwidth_controller: Option<BandwidthController>,
+        bandwidth_controller: Option<BandwidthController<PersistentStorage>>,
     ) -> Self {
         GatewayClient {
             authenticated: false,
-            testnet_mode: false,
+            disabled_credentials_mode: true,
             bandwidth_remaining: 0,
             gateway_address,
             gateway_identity,
@@ -96,8 +100,8 @@ impl GatewayClient {
         }
     }
 
-    pub fn set_testnet_mode(&mut self, testnet_mode: bool) {
-        self.testnet_mode = testnet_mode
+    pub fn set_disabled_credentials_mode(&mut self, disabled_credentials_mode: bool) {
+        self.disabled_credentials_mode = disabled_credentials_mode
     }
 
     // TODO: later convert into proper builder methods
@@ -130,7 +134,7 @@ impl GatewayClient {
 
         GatewayClient {
             authenticated: false,
-            testnet_mode: false,
+            disabled_credentials_mode: true,
             bandwidth_remaining: 0,
             gateway_address,
             gateway_identity,
@@ -544,13 +548,13 @@ impl GatewayClient {
         if self.shared_key.is_none() {
             return Err(GatewayClientError::NoSharedKeyAvailable);
         }
-        if self.bandwidth_controller.is_none() && !self.testnet_mode {
+        if self.bandwidth_controller.is_none() && !self.disabled_credentials_mode {
             return Err(GatewayClientError::NoBandwidthControllerAvailable);
         }
 
         warn!("Not enough bandwidth. Trying to get more bandwidth, this might take a while");
-        if self.testnet_mode {
-            info!("The client is running in testnet mode - attempting to claim bandwidth without a credential");
+        if self.disabled_credentials_mode {
+            info!("The client is running in disabled credentials mode - attempting to claim bandwidth without a credential");
             return self.try_claim_testnet_bandwidth().await;
         }
 

common/client-libs/gateway-client/src/error.rs

@@ -1,6 +1,10 @@
 // Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
 // SPDX-License-Identifier: Apache-2.0
 
+#[cfg(target_arch = "wasm32")]
+use crate::wasm_storage::StorageError;
+#[cfg(not(target_arch = "wasm32"))]
+use credential_storage::error::StorageError;
 use gateway_requests::registration::handshake::error::HandshakeError;
 use std::io;
 use thiserror::Error;
@@ -21,15 +25,18 @@ pub enum GatewayClientError {
     #[error("There was a network error - {0}")]
     NetworkError(#[from] WsError),
 
+    #[error("There was a credential storage error - {0}")]
+    CredentialStorageError(#[from] StorageError),
+
+    #[cfg(feature = "coconut")]
+    #[error("Coconut error - {0}")]
+    CoconutError(#[from] coconut_interface::CoconutError),
+
     // TODO: see if `JsValue` is a reasonable type for this
     #[cfg(target_arch = "wasm32")]
     #[error("There was a network error")]
     NetworkErrorWasm(JsValue),
 
-    #[cfg(not(feature = "coconut"))]
-    #[error("Keypair IO error - {0}")]
-    IOError(#[from] std::io::Error),
-
     #[cfg(not(feature = "coconut"))]
     #[error("Could not burn ERC20 token in Ethereum smart contract - {0}")]
     BurnTokenError(#[from] Web3Error),
@@ -69,6 +76,9 @@ pub enum GatewayClientError {
     #[error("Client does not have enough bandwidth: estimated {0}, remaining: {1}")]
     NotEnoughBandwidth(i64, i64),
 
+    #[error("There are no more bandwidth credentials acquired. Please buy some more if you want to use the mixnet")]
+    NoMoreBandwidthCredentials,
+
     #[error("Received an unexpected response")]
     UnexpectedResponse,
 

common/client-libs/gateway-client/src/lib.rs

@@ -13,6 +13,8 @@ pub mod client;
 pub mod error;
 pub mod packet_router;
 pub mod socket_state;
+#[cfg(feature = "wasm")]
+mod wasm_storage;
 
 /// Helper method for reading from websocket stream. Helps to flatten the structure.
 pub(crate) fn cleanup_socket_message(

common/client-libs/gateway-client/src/wasm_storage.rs

@@ -0,0 +1,98 @@
+// Copyright 2022 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use async_trait::async_trait;
+use thiserror::Error;
+
+#[derive(Error, Debug)]
+pub enum StorageError {
+    #[error("Wasm client is not yet supported")]
+    WasmNotSupported,
+
+    #[allow(dead_code)]
+    #[error("Code shouldn't reach this point")]
+    InconsistentData,
+}
+
+#[derive(Clone)]
+pub struct PersistentStorage {}
+
+pub struct CoconutCredential {
+    pub id: i64,
+    pub voucher_value: String,
+    pub voucher_info: String,
+    pub serial_number: String,
+    pub binding_number: String,
+    pub signature: String,
+}
+
+pub struct ERC20Credential {
+    pub id: i64,
+    pub public_key: String,
+    pub private_key: String,
+    pub consumed: bool,
+}
+
+#[async_trait]
+pub trait Storage: Send + Sync {
+    async fn insert_coconut_credential(
+        &self,
+        voucher_value: String,
+        voucher_info: String,
+        serial_number: String,
+        binding_number: String,
+        signature: String,
+    ) -> Result<(), StorageError>;
+
+    async fn get_next_coconut_credential(&self) -> Result<CoconutCredential, StorageError>;
+
+    async fn remove_coconut_credential(&self, id: i64) -> Result<(), StorageError>;
+
+    async fn insert_erc20_credential(
+        &self,
+        public_key: String,
+        private_key: String,
+    ) -> Result<(), StorageError>;
+
+    async fn get_next_erc20_credential(&self) -> Result<ERC20Credential, StorageError>;
+
+    async fn consume_erc20_credential(&self, public_key: String) -> Result<(), StorageError>;
+}
+
+#[async_trait]
+impl Storage for PersistentStorage {
+    async fn insert_coconut_credential(
+        &self,
+        _voucher_value: String,
+        _voucher_info: String,
+        _serial_number: String,
+        _binding_number: String,
+        _signature: String,
+    ) -> Result<(), StorageError> {
+        Err(StorageError::WasmNotSupported)
+    }
+
+    async fn get_next_coconut_credential(&self) -> Result<CoconutCredential, StorageError> {
+        Err(StorageError::WasmNotSupported)
+    }
+
+    async fn remove_coconut_credential(&self, _id: i64) -> Result<(), StorageError> {
+        Err(StorageError::WasmNotSupported)
+    }
+
+    async fn insert_erc20_credential(
+        &self,
+        _public_key: String,
+        _private_key: String,
+    ) -> Result<(), StorageError> {
+        Err(StorageError::WasmNotSupported)
+    }
+
+    async fn get_next_erc20_credential(&self) -> Result<ERC20Credential, StorageError> {
+        Err(StorageError::WasmNotSupported)
+    }
+
+    async fn consume_erc20_credential(&self, _public_key: String) -> Result<(), StorageError> {
+        Err(StorageError::WasmNotSupported)
+    }
+}

common/client-libs/mixnet-client/src/client.rs

@@ -133,20 +133,14 @@ impl Client {
         if current_attempt == 0 {
             None
         } else {
-            // according to https://github.com/tokio-rs/tokio/issues/1953 there's an undocumented
-            // limit of tokio delay of about 2 years.
-            // let's ensure our delay is always on a sane side of being maximum 1 hour.
-            let maximum_sane_delay = Duration::from_secs(60 * 60);
+            let exp = 2_u32.checked_pow(current_attempt);
+            let backoff = exp
+                .and_then(|exp| self.config.initial_reconnection_backoff.checked_mul(exp))
+                .unwrap_or(self.config.maximum_reconnection_backoff);
 
             Some(std::cmp::min(
-                maximum_sane_delay,
-                std::cmp::min(
-                    self.config
-                        .initial_reconnection_backoff
-                        .checked_mul(2_u32.pow(current_attempt))
-                        .unwrap_or(self.config.maximum_reconnection_backoff),
-                    self.config.maximum_reconnection_backoff,
-                ),
+                backoff,
+                self.config.maximum_reconnection_backoff,
             ))
         }
     }
@@ -254,3 +248,45 @@ impl SendWithoutResponse for Client {
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn dummy_client() -> Client {
+        Client::new(Config {
+            initial_reconnection_backoff: Duration::from_millis(10_000),
+            maximum_reconnection_backoff: Duration::from_millis(300_000),
+            initial_connection_timeout: Duration::from_millis(1_500),
+            maximum_connection_buffer_size: 128,
+        })
+    }
+
+    #[test]
+    fn determining_backoff_works_regardless_of_attempt() {
+        let client = dummy_client();
+        assert!(client.determine_backoff(0).is_none());
+        assert!(client.determine_backoff(1).is_some());
+        assert!(client.determine_backoff(2).is_some());
+        assert_eq!(
+            client.determine_backoff(16).unwrap(),
+            client.config.maximum_reconnection_backoff
+        );
+        assert_eq!(
+            client.determine_backoff(32).unwrap(),
+            client.config.maximum_reconnection_backoff
+        );
+        assert_eq!(
+            client.determine_backoff(1024).unwrap(),
+            client.config.maximum_reconnection_backoff
+        );
+        assert_eq!(
+            client.determine_backoff(65536).unwrap(),
+            client.config.maximum_reconnection_backoff
+        );
+        assert_eq!(
+            client.determine_backoff(u32::MAX).unwrap(),
+            client.config.maximum_reconnection_backoff
+        );
+    }
+}

common/client-libs/validator-client/Cargo.toml

@@ -37,7 +37,7 @@ prost = { version = "0.9", default-features = false, optional = true }
 flate2 = { version = "1.0.20", optional = true }
 sha2 = { version = "0.9.5", optional = true }
 itertools = { version = "0.10", optional = true }
-cosmwasm-std = { version = "1.0.0-beta6", optional = true }
+cosmwasm-std = { version = "1.0.0-beta8", optional = true }
 
 [dev-dependencies]
 ts-rs = "6.1.2"

common/client-libs/validator-client/src/client.rs

@@ -5,6 +5,9 @@ use crate::{validator_api, ValidatorClientError};
 use coconut_interface::{BlindSignRequestBody, BlindedSignatureResponse, VerificationKeyResponse};
 use mixnet_contract_common::{GatewayBond, IdentityKeyRef, MixNodeBond};
 use url::Url;
+
+#[cfg(feature = "nymd-client")]
+use validator_api_requests::models::UptimeResponse;
 use validator_api_requests::models::{
     CoreNodeStatusResponse, MixnodeStatusResponse, RewardEstimationResponse,
     StakeSaturationResponse,
@@ -153,6 +156,10 @@ impl Client<SigningNymdClient> {
         )?;
         Ok(())
     }
+
+    pub fn set_nymd_simulated_gas_multiplier(&mut self, multiplier: f32) {
+        self.nymd.set_simulated_gas_multiplier(multiplier)
+    }
 }
 
 #[cfg(feature = "nymd-client")]
@@ -260,13 +267,14 @@ impl<C> Client<C> {
         &self,
         address: String,
         mix_identity: IdentityKey,
+        proxy: Option<String>,
     ) -> Result<u128, ValidatorClientError>
     where
         C: CosmWasmClient + Sync,
     {
         Ok(self
             .nymd
-            .get_delegator_rewards(address, mix_identity)
+            .get_delegator_rewards(address, mix_identity, proxy)
             .await?
             .u128())
     }
@@ -274,13 +282,14 @@ impl<C> Client<C> {
     pub async fn get_pending_delegation_events(
         &self,
         owner_address: String,
+        proxy_address: Option<String>,
     ) -> Result<Vec<DelegationEvent>, ValidatorClientError>
     where
         C: CosmWasmClient + Sync,
     {
         Ok(self
             .nymd
-            .get_pending_delegation_events(owner_address)
+            .get_pending_delegation_events(owner_address, proxy_address)
             .await?)
     }
 
@@ -576,6 +585,12 @@ impl<C> Client<C> {
         Ok(delegations)
     }
 
+    pub async fn get_mixnode_avg_uptimes(
+        &self,
+    ) -> Result<Vec<UptimeResponse>, ValidatorClientError> {
+        Ok(self.validator_api.get_mixnode_avg_uptimes().await?)
+    }
+
     pub async fn blind_sign(
         &self,
         request_body: &BlindSignRequestBody,

common/client-libs/validator-client/src/nymd/cosmwasm_client/client.rs

@@ -8,9 +8,7 @@ use crate::nymd::cosmwasm_client::types::{
 };
 use crate::nymd::error::NymdError;
 use async_trait::async_trait;
-use cosmrs::proto::cosmos::auth::v1beta1::{
-    BaseAccount, QueryAccountRequest, QueryAccountResponse,
-};
+use cosmrs::proto::cosmos::auth::v1beta1::{QueryAccountRequest, QueryAccountResponse};
 use cosmrs::proto::cosmos::bank::v1beta1::{
     QueryAllBalancesRequest, QueryAllBalancesResponse, QueryBalanceRequest, QueryBalanceResponse,
     QueryTotalSupplyRequest, QueryTotalSupplyResponse,
@@ -32,12 +30,26 @@ use cosmwasm_std::Coin as CosmWasmCoin;
 use prost::Message;
 use serde::{Deserialize, Serialize};
 use std::convert::{TryFrom, TryInto};
+use std::time::Duration;
 
 #[async_trait]
-impl CosmWasmClient for HttpClient {}
+impl CosmWasmClient for HttpClient {
+    fn broadcast_polling_rate(&self) -> Duration {
+        Duration::from_secs(4)
+    }
+
+    fn broadcast_timeout(&self) -> Duration {
+        Duration::from_secs(60)
+    }
+}
 
 #[async_trait]
 pub trait CosmWasmClient: rpc::Client {
+    // this should probably get redesigned, but I'm leaving those like that temporarily to fix
+    // the underlying issue more quickly
+    fn broadcast_polling_rate(&self) -> Duration;
+    fn broadcast_timeout(&self) -> Duration;
+
     // helper method to remove duplicate code involved in making abci requests with protobuf messages
     // TODO: perhaps it should have an additional argument to determine whether the response should
     // require proof?
@@ -83,21 +95,16 @@ pub trait CosmWasmClient: rpc::Client {
             .make_abci_query::<_, QueryAccountResponse>(path, req)
             .await?;
 
-        let base_account = res
-            .account
-            .map(|account| BaseAccount::decode(account.value.as_ref()))
-            .transpose()?;
-
-        base_account
-            .map(|base_account| base_account.try_into())
-            .transpose()
+        res.account.map(TryFrom::try_from).transpose()
     }
 
     async fn get_sequence(&self, address: &AccountId) -> Result<SequenceResponse, NymdError> {
-        let base_account = self
+        let account = self
             .get_account(address)
             .await?
             .ok_or_else(|| NymdError::NonExistentAccountError(address.clone()))?;
+        let base_account = account.try_get_base_account()?;
+
         Ok(SequenceResponse {
             account_number: base_account.account_number,
             sequence: base_account.sequence,
@@ -260,6 +267,42 @@ pub trait CosmWasmClient: rpc::Client {
         Ok(rpc::Client::broadcast_tx_commit(self, tx).await?)
     }
 
+    async fn broadcast_tx(&self, tx: Transaction) -> Result<TxResponse, NymdError> {
+        let broadcasted = CosmWasmClient::broadcast_tx_sync(self, tx).await?;
+
+        if broadcasted.code.is_err() {
+            let code_val = broadcasted.code.value();
+            return Err(NymdError::BroadcastTxErrorDeliverTx {
+                hash: broadcasted.hash,
+                height: None,
+                code: code_val,
+                raw_log: broadcasted.log.to_string(),
+            });
+        }
+
+        let tx_hash = broadcasted.hash;
+
+        let start = tokio::time::Instant::now();
+        loop {
+            log::debug!(
+                "Polling for result of including {} in a block...",
+                broadcasted.hash
+            );
+            if tokio::time::Instant::now().duration_since(start) >= self.broadcast_timeout() {
+                return Err(NymdError::BroadcastTimeout {
+                    hash: tx_hash,
+                    timeout: self.broadcast_timeout(),
+                });
+            }
+
+            if let Ok(poll_res) = self.get_tx(tx_hash).await {
+                return Ok(poll_res);
+            }
+
+            tokio::time::sleep(self.broadcast_polling_rate()).await;
+        }
+    }
+
     async fn get_codes(&self) -> Result<Vec<Code>, NymdError> {
         let path = Some("/cosmwasm.wasm.v1.Query/Codes".parse().unwrap());
 

common/client-libs/validator-client/src/nymd/cosmwasm_client/helpers.rs

@@ -3,7 +3,9 @@
 
 use crate::nymd::error::NymdError;
 use cosmrs::proto::cosmos::base::query::v1beta1::{PageRequest, PageResponse};
+use cosmrs::proto::cosmos::base::v1beta1::Coin as ProtoCoin;
 use cosmrs::rpc::endpoint::broadcast;
+use cosmrs::Coin;
 use flate2::write::GzEncoder;
 use flate2::Compression;
 use std::io::Write;
@@ -17,7 +19,7 @@ impl CheckResponse for broadcast::tx_commit::Response {
         if self.check_tx.code.is_err() {
             return Err(NymdError::BroadcastTxErrorCheckTx {
                 hash: self.hash,
-                height: self.height,
+                height: Some(self.height),
                 code: self.check_tx.code.value(),
                 raw_log: self.check_tx.log.value().to_owned(),
             });
@@ -26,7 +28,7 @@ impl CheckResponse for broadcast::tx_commit::Response {
         if self.deliver_tx.code.is_err() {
             return Err(NymdError::BroadcastTxErrorDeliverTx {
                 hash: self.hash,
-                height: self.height,
+                height: Some(self.height),
                 code: self.deliver_tx.code.value(),
                 raw_log: self.deliver_tx.log.value().to_owned(),
             });
@@ -36,6 +38,21 @@ impl CheckResponse for broadcast::tx_commit::Response {
     }
 }
 
+impl CheckResponse for crate::nymd::TxResponse {
+    fn check_response(self) -> Result<Self, NymdError> {
+        if self.tx_result.code.is_err() {
+            return Err(NymdError::BroadcastTxErrorDeliverTx {
+                hash: self.hash,
+                height: Some(self.height),
+                code: self.tx_result.code.value(),
+                raw_log: self.tx_result.log.value().to_owned(),
+            });
+        }
+
+        Ok(self)
+    }
+}
+
 pub(crate) fn compress_wasm_code(code: &[u8]) -> Result<Vec<u8>, NymdError> {
     // using compression level 9, same as cosmjs, that optimises for size
     let mut encoder = GzEncoder::new(Vec::new(), Compression::best());
@@ -65,3 +82,14 @@ pub(crate) fn next_page_key(pagination_info: Option<PageResponse>) -> Option<Vec
 
     None
 }
+
+pub(crate) fn parse_proto_coin_vec(value: Vec<ProtoCoin>) -> Result<Vec<Coin>, NymdError> {
+    value
+        .into_iter()
+        .map(|proto_coin| {
+            Coin::try_from(&proto_coin).map_err(|_| NymdError::MalformedCoin {
+                coin_representation: format!("{:?}", proto_coin),
+            })
+        })
+        .collect()
+}

common/client-libs/validator-client/src/nymd/cosmwasm_client/signing_client.rs

@@ -2,6 +2,7 @@
 // SPDX-License-Identifier: Apache-2.0
 
 use std::convert::TryInto;
+use std::time::Duration;
 
 use async_trait::async_trait;
 use cosmrs::bank::MsgSend;
@@ -24,7 +25,7 @@ use crate::nymd::cosmwasm_client::types::*;
 use crate::nymd::error::NymdError;
 use crate::nymd::fee::{Fee, DEFAULT_SIMULATED_GAS_MULTIPLIER};
 use crate::nymd::wallet::DirectSecp256k1HdWallet;
-use crate::nymd::{CosmosCoin, GasPrice};
+use crate::nymd::{CosmosCoin, GasPrice, TxResponse};
 
 // we need to have **a** valid secp256k1 signature for simulation purposes.
 // it doesn't matter what it is as long as it parses correctly
@@ -35,6 +36,9 @@ const DUMMY_SECP256K1_SIGNATURE: &[u8] = &[
     91,
 ];
 
+const DEFAULT_BROADCAST_POLLING_RATE: Duration = Duration::from_secs(4);
+const DEFAULT_BROADCAST_TIMEOUT: Duration = Duration::from_secs(60);
+
 #[async_trait]
 pub trait SigningCosmWasmClient: CosmWasmClient {
     fn signer(&self) -> &DirectSecp256k1HdWallet;
@@ -111,12 +115,12 @@ pub trait SigningCosmWasmClient: CosmWasmClient {
         .map_err(|_| NymdError::SerializationError("MsgStoreCode".to_owned()))?;
 
         let tx_res = self
-            .sign_and_broadcast_commit(sender_address, vec![upload_msg], fee, memo)
+            .sign_and_broadcast(sender_address, vec![upload_msg], fee, memo)
             .await?
             .check_response()?;
 
-        let logs = parse_raw_logs(tx_res.deliver_tx.log)?;
-        let gas_info = GasInfo::new(tx_res.deliver_tx.gas_wanted, tx_res.deliver_tx.gas_used);
+        let logs = parse_raw_logs(tx_res.tx_result.log)?;
+        let gas_info = GasInfo::new(tx_res.tx_result.gas_wanted, tx_res.tx_result.gas_used);
 
         // TODO: should those strings be extracted into some constants?
         // the reason I think unwrap here is fine is that if the transaction succeeded and those
@@ -172,12 +176,12 @@ pub trait SigningCosmWasmClient: CosmWasmClient {
         .map_err(|_| NymdError::SerializationError("MsgInstantiateContract".to_owned()))?;
 
         let tx_res = self
-            .sign_and_broadcast_commit(sender_address, vec![init_msg], fee, memo)
+            .sign_and_broadcast(sender_address, vec![init_msg], fee, memo)
             .await?
             .check_response()?;
 
-        let logs = parse_raw_logs(tx_res.deliver_tx.log)?;
-        let gas_info = GasInfo::new(tx_res.deliver_tx.gas_wanted, tx_res.deliver_tx.gas_used);
+        let logs = parse_raw_logs(tx_res.tx_result.log)?;
+        let gas_info = GasInfo::new(tx_res.tx_result.gas_wanted, tx_res.tx_result.gas_used);
 
         // TODO: should those strings be extracted into some constants?
         // the reason I think unwrap here is fine is that if the transaction succeeded and those
@@ -214,14 +218,14 @@ pub trait SigningCosmWasmClient: CosmWasmClient {
         .map_err(|_| NymdError::SerializationError("MsgUpdateAdmin".to_owned()))?;
 
         let tx_res = self
-            .sign_and_broadcast_commit(sender_address, vec![change_admin_msg], fee, memo)
+            .sign_and_broadcast(sender_address, vec![change_admin_msg], fee, memo)
             .await?
             .check_response()?;
 
-        let gas_info = GasInfo::new(tx_res.deliver_tx.gas_wanted, tx_res.deliver_tx.gas_used);
+        let gas_info = GasInfo::new(tx_res.tx_result.gas_wanted, tx_res.tx_result.gas_used);
 
         Ok(ChangeAdminResult {
-            logs: parse_raw_logs(tx_res.deliver_tx.log)?,
+            logs: parse_raw_logs(tx_res.tx_result.log)?,
             transaction_hash: tx_res.hash,
             gas_info,
         })
@@ -242,14 +246,14 @@ pub trait SigningCosmWasmClient: CosmWasmClient {
         .map_err(|_| NymdError::SerializationError("MsgClearAdmin".to_owned()))?;
 
         let tx_res = self
-            .sign_and_broadcast_commit(sender_address, vec![change_admin_msg], fee, memo)
+            .sign_and_broadcast(sender_address, vec![change_admin_msg], fee, memo)
             .await?
             .check_response()?;
 
-        let gas_info = GasInfo::new(tx_res.deliver_tx.gas_wanted, tx_res.deliver_tx.gas_used);
+        let gas_info = GasInfo::new(tx_res.tx_result.gas_wanted, tx_res.tx_result.gas_used);
 
         Ok(ChangeAdminResult {
-            logs: parse_raw_logs(tx_res.deliver_tx.log)?,
+            logs: parse_raw_logs(tx_res.tx_result.log)?,
             transaction_hash: tx_res.hash,
             gas_info,
         })
@@ -277,14 +281,14 @@ pub trait SigningCosmWasmClient: CosmWasmClient {
         .map_err(|_| NymdError::SerializationError("MsgMigrateContract".to_owned()))?;
 
         let tx_res = self
-            .sign_and_broadcast_commit(sender_address, vec![migrate_msg], fee, memo)
+            .sign_and_broadcast(sender_address, vec![migrate_msg], fee, memo)
             .await?
             .check_response()?;
 
-        let gas_info = GasInfo::new(tx_res.deliver_tx.gas_wanted, tx_res.deliver_tx.gas_used);
+        let gas_info = GasInfo::new(tx_res.tx_result.gas_wanted, tx_res.tx_result.gas_used);
 
         Ok(MigrateResult {
-            logs: parse_raw_logs(tx_res.deliver_tx.log)?,
+            logs: parse_raw_logs(tx_res.tx_result.log)?,
             transaction_hash: tx_res.hash,
             gas_info,
         })
@@ -312,14 +316,15 @@ pub trait SigningCosmWasmClient: CosmWasmClient {
         .map_err(|_| NymdError::SerializationError("MsgExecuteContract".to_owned()))?;
 
         let tx_res = self
-            .sign_and_broadcast_commit(sender_address, vec![execute_msg], fee, memo)
+            .sign_and_broadcast(sender_address, vec![execute_msg], fee, memo)
             .await?
             .check_response()?;
 
-        let gas_info = GasInfo::new(tx_res.deliver_tx.gas_wanted, tx_res.deliver_tx.gas_used);
+        let gas_info = GasInfo::new(tx_res.tx_result.gas_wanted, tx_res.tx_result.gas_used);
 
         Ok(ExecuteResult {
-            logs: parse_raw_logs(tx_res.deliver_tx.log)?,
+            logs: parse_raw_logs(tx_res.tx_result.log)?,
+            data: tx_res.tx_result.data,
             transaction_hash: tx_res.hash,
             gas_info,
         })
@@ -352,14 +357,15 @@ pub trait SigningCosmWasmClient: CosmWasmClient {
             .collect::<Result<_, _>>()?;
 
         let tx_res = self
-            .sign_and_broadcast_commit(sender_address, messages, fee, memo)
+            .sign_and_broadcast(sender_address, messages, fee, memo)
             .await?
             .check_response()?;
 
-        let gas_info = GasInfo::new(tx_res.deliver_tx.gas_wanted, tx_res.deliver_tx.gas_used);
+        let gas_info = GasInfo::new(tx_res.tx_result.gas_wanted, tx_res.tx_result.gas_used);
 
         Ok(ExecuteResult {
-            logs: parse_raw_logs(tx_res.deliver_tx.log)?,
+            logs: parse_raw_logs(tx_res.tx_result.log)?,
+            data: tx_res.tx_result.data,
             transaction_hash: tx_res.hash,
             gas_info,
         })
@@ -372,7 +378,7 @@ pub trait SigningCosmWasmClient: CosmWasmClient {
         amount: Vec<Coin>,
         fee: Fee,
         memo: impl Into<String> + Send + 'static,
-    ) -> Result<broadcast::tx_commit::Response, NymdError> {
+    ) -> Result<TxResponse, NymdError> {
         let send_msg = MsgSend {
             from_address: sender_address.clone(),
             to_address: recipient_address.clone(),
@@ -381,7 +387,7 @@ pub trait SigningCosmWasmClient: CosmWasmClient {
         .to_any()
         .map_err(|_| NymdError::SerializationError("MsgSend".to_owned()))?;
 
-        self.sign_and_broadcast_commit(sender_address, vec![send_msg], fee, memo)
+        self.sign_and_broadcast(sender_address, vec![send_msg], fee, memo)
             .await?
             .check_response()
     }
@@ -392,7 +398,7 @@ pub trait SigningCosmWasmClient: CosmWasmClient {
         msgs: I,
         fee: Fee,
         memo: impl Into<String> + Send + 'static,
-    ) -> Result<broadcast::tx_commit::Response, NymdError>
+    ) -> Result<TxResponse, NymdError>
     where
         I: IntoIterator<Item = (AccountId, Vec<Coin>)> + Send,
     {
@@ -409,7 +415,7 @@ pub trait SigningCosmWasmClient: CosmWasmClient {
             })
             .collect::<Result<_, _>>()?;
 
-        self.sign_and_broadcast_commit(sender_address, messages, fee, memo)
+        self.sign_and_broadcast(sender_address, messages, fee, memo)
             .await?
             .check_response()
     }
@@ -421,7 +427,7 @@ pub trait SigningCosmWasmClient: CosmWasmClient {
         amount: Coin,
         fee: Fee,
         memo: impl Into<String> + Send + 'static,
-    ) -> Result<broadcast::tx_commit::Response, NymdError> {
+    ) -> Result<TxResponse, NymdError> {
         let delegate_msg = MsgDelegate {
             delegator_address: delegator_address.to_owned(),
             validator_address: validator_address.to_owned(),
@@ -430,7 +436,7 @@ pub trait SigningCosmWasmClient: CosmWasmClient {
         .to_any()
         .map_err(|_| NymdError::SerializationError("MsgDelegate".to_owned()))?;
 
-        self.sign_and_broadcast_commit(delegator_address, vec![delegate_msg], fee, memo)
+        self.sign_and_broadcast(delegator_address, vec![delegate_msg], fee, memo)
             .await?
             .check_response()
     }
@@ -442,7 +448,7 @@ pub trait SigningCosmWasmClient: CosmWasmClient {
         amount: Coin,
         fee: Fee,
         memo: impl Into<String> + Send + 'static,
-    ) -> Result<broadcast::tx_commit::Response, NymdError> {
+    ) -> Result<TxResponse, NymdError> {
         let undelegate_msg = MsgUndelegate {
             delegator_address: delegator_address.to_owned(),
             validator_address: validator_address.to_owned(),
@@ -451,7 +457,7 @@ pub trait SigningCosmWasmClient: CosmWasmClient {
         .to_any()
         .map_err(|_| NymdError::SerializationError("MsgUndelegate".to_owned()))?;
 
-        self.sign_and_broadcast_commit(delegator_address, vec![undelegate_msg], fee, memo)
+        self.sign_and_broadcast(delegator_address, vec![undelegate_msg], fee, memo)
             .await?
             .check_response()
     }
@@ -462,7 +468,7 @@ pub trait SigningCosmWasmClient: CosmWasmClient {
         validator_address: &AccountId,
         fee: Fee,
         memo: impl Into<String> + Send + 'static,
-    ) -> Result<broadcast::tx_commit::Response, NymdError> {
+    ) -> Result<TxResponse, NymdError> {
         let withdraw_msg = MsgWithdrawDelegatorReward {
             delegator_address: delegator_address.to_owned(),
             validator_address: validator_address.to_owned(),
@@ -470,7 +476,7 @@ pub trait SigningCosmWasmClient: CosmWasmClient {
         .to_any()
         .map_err(|_| NymdError::SerializationError("MsgWithdrawDelegatorReward".to_owned()))?;
 
-        self.sign_and_broadcast_commit(delegator_address, vec![withdraw_msg], fee, memo)
+        self.sign_and_broadcast(delegator_address, vec![withdraw_msg], fee, memo)
             .await?
             .check_response()
     }
@@ -573,6 +579,27 @@ pub trait SigningCosmWasmClient: CosmWasmClient {
         CosmWasmClient::broadcast_tx_commit(self, tx_bytes.into()).await
     }
 
+    /// Broadcast a transaction to the network and monitors its inclusion in a block.
+    async fn sign_and_broadcast(
+        &self,
+        signer_address: &AccountId,
+        messages: Vec<Any>,
+        fee: Fee,
+        memo: impl Into<String> + Send + 'static,
+    ) -> Result<TxResponse, NymdError> {
+        let memo = memo.into();
+        let fee = self
+            .determine_transaction_fee(signer_address, &messages, fee, &memo)
+            .await?;
+
+        let tx_raw = self.sign(signer_address, messages, fee, memo).await?;
+        let tx_bytes = tx_raw
+            .to_bytes()
+            .map_err(|_| NymdError::SerializationError("Tx".to_owned()))?;
+
+        self.broadcast_tx(tx_bytes.into()).await
+    }
+
     fn sign_direct(
         &self,
         signer_address: &AccountId,
@@ -638,6 +665,9 @@ pub struct Client {
     rpc_client: HttpClient,
     signer: DirectSecp256k1HdWallet,
     gas_price: GasPrice,
+
+    broadcast_polling_rate: Duration,
+    broadcast_timeout: Duration,
 }
 
 impl Client {
@@ -654,8 +684,18 @@ impl Client {
             rpc_client,
             signer,
             gas_price,
+            broadcast_polling_rate: DEFAULT_BROADCAST_POLLING_RATE,
+            broadcast_timeout: DEFAULT_BROADCAST_TIMEOUT,
         })
     }
+
+    pub fn set_broadcast_polling_rate(&mut self, broadcast_polling_rate: Duration) {
+        self.broadcast_polling_rate = broadcast_polling_rate
+    }
+
+    pub fn set_broadcast_timeout(&mut self, broadcast_timeout: Duration) {
+        self.broadcast_timeout = broadcast_timeout
+    }
 }
 
 #[async_trait]
@@ -669,7 +709,15 @@ impl rpc::Client for Client {
 }
 
 #[async_trait]
-impl CosmWasmClient for Client {}
+impl CosmWasmClient for Client {
+    fn broadcast_polling_rate(&self) -> Duration {
+        self.broadcast_polling_rate
+    }
+
+    fn broadcast_timeout(&self) -> Duration {
+        self.broadcast_timeout
+    }
+}
 
 #[async_trait]
 impl SigningCosmWasmClient for Client {

common/client-libs/validator-client/src/nymd/cosmwasm_client/types.rs

@@ -1,23 +1,35 @@
-// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// Copyright 2021-2022 - Nym Technologies SA <contact@nymtech.net>
 // SPDX-License-Identifier: Apache-2.0
 
 // TODO: There's a significant argument to pull those out of the package and make a PR on https://github.com/cosmos/cosmos-rust/
 
+use crate::nymd::cosmwasm_client::helpers::parse_proto_coin_vec;
 use crate::nymd::cosmwasm_client::logs::Log;
 use crate::nymd::error::NymdError;
 use cosmrs::crypto::PublicKey;
-use cosmrs::proto::cosmos::auth::v1beta1::BaseAccount;
+use cosmrs::proto::cosmos::auth::v1beta1::{
+    BaseAccount as ProtoBaseAccount, ModuleAccount as ProtoModuleAccount,
+};
 use cosmrs::proto::cosmos::base::abci::v1beta1::{
     GasInfo as ProtoGasInfo, Result as ProtoAbciResult,
 };
 use cosmrs::proto::cosmos::tx::v1beta1::SimulateResponse as ProtoSimulateResponse;
+use cosmrs::proto::cosmos::vesting::v1beta1::{
+    BaseVestingAccount as ProtoBaseVestingAccount,
+    ContinuousVestingAccount as ProtoContinuousVestingAccount,
+    DelayedVestingAccount as ProtoDelayedVestingAccount, Period as ProtoPeriod,
+    PeriodicVestingAccount as ProtoPeriodicVestingAccount,
+    PermanentLockedAccount as ProtoPermanentLockedAccount,
+};
 use cosmrs::proto::cosmwasm::wasm::v1::{
     CodeInfoResponse, ContractCodeHistoryEntry as ProtoContractCodeHistoryEntry,
     ContractCodeHistoryOperationType, ContractInfo as ProtoContractInfo,
 };
+use cosmrs::tendermint::abci::Data;
 use cosmrs::tendermint::{abci, chain};
 use cosmrs::tx::{AccountNumber, Gas, SequenceNumber};
-use cosmrs::{tx, AccountId, Coin};
+use cosmrs::{tx, AccountId, Any, Coin};
+use prost::Message;
 use serde::Serialize;
 use std::convert::{TryFrom, TryInto};
 
@@ -32,8 +44,11 @@ pub struct SequenceResponse {
     pub sequence: SequenceNumber,
 }
 
+/// BaseAccount defines a base account type. It contains all the necessary fields
+/// for basic account functionality. Any custom account type should extend this
+/// type for additional functionality (e.g. vesting).
 #[derive(Debug)]
-pub struct Account {
+pub struct BaseAccount {
     /// Bech32 account address
     pub address: AccountId,
     pub pubkey: Option<PublicKey>,
@@ -41,10 +56,10 @@ pub struct Account {
     pub sequence: SequenceNumber,
 }
 
-impl TryFrom<BaseAccount> for Account {
+impl TryFrom<ProtoBaseAccount> for BaseAccount {
     type Error = NymdError;
 
-    fn try_from(value: BaseAccount) -> Result<Self, Self::Error> {
+    fn try_from(value: ProtoBaseAccount) -> Result<Self, Self::Error> {
         let address: AccountId = value
             .address
             .parse()
@@ -56,7 +71,7 @@ impl TryFrom<BaseAccount> for Account {
             .transpose()
             .map_err(|_| NymdError::InvalidPublicKey(address.clone()))?;
 
-        Ok(Account {
+        Ok(BaseAccount {
             address,
             pubkey,
             account_number: value.account_number,
@@ -65,6 +80,261 @@ impl TryFrom<BaseAccount> for Account {
     }
 }
 
+/// ModuleAccount defines an account for modules that holds coins on a pool.
+#[derive(Debug)]
+pub struct ModuleAccount {
+    pub base_account: Option<BaseAccount>,
+    pub name: String,
+    pub permissions: Vec<String>,
+}
+
+impl TryFrom<ProtoModuleAccount> for ModuleAccount {
+    type Error = NymdError;
+
+    fn try_from(value: ProtoModuleAccount) -> Result<Self, Self::Error> {
+        let base_account = value.base_account.map(TryFrom::try_from).transpose()?;
+
+        Ok(ModuleAccount {
+            base_account,
+            name: value.name,
+            permissions: value.permissions,
+        })
+    }
+}
+
+/// BaseVestingAccount implements the VestingAccount interface. It contains all
+/// the necessary fields needed for any vesting account implementation.
+#[derive(Debug)]
+pub struct BaseVestingAccount {
+    pub base_account: Option<BaseAccount>,
+    pub original_vesting: Vec<Coin>,
+    pub delegated_free: Vec<Coin>,
+    pub delegated_vesting: Vec<Coin>,
+    pub end_time: i64,
+}
+
+impl TryFrom<ProtoBaseVestingAccount> for BaseVestingAccount {
+    type Error = NymdError;
+
+    fn try_from(value: ProtoBaseVestingAccount) -> Result<Self, Self::Error> {
+        let base_account = value.base_account.map(TryFrom::try_from).transpose()?;
+
+        let original_vesting = parse_proto_coin_vec(value.original_vesting)?;
+        let delegated_free = parse_proto_coin_vec(value.delegated_free)?;
+        let delegated_vesting = parse_proto_coin_vec(value.delegated_vesting)?;
+
+        Ok(BaseVestingAccount {
+            base_account,
+            original_vesting,
+            delegated_free,
+            delegated_vesting,
+            end_time: value.end_time,
+        })
+    }
+}
+
+/// ContinuousVestingAccount implements the VestingAccount interface. It
+/// continuously vests by unlocking coins linearly with respect to time.
+#[derive(Debug)]
+pub struct ContinuousVestingAccount {
+    pub base_vesting_account: Option<BaseVestingAccount>,
+    pub start_time: i64,
+}
+
+impl TryFrom<ProtoContinuousVestingAccount> for ContinuousVestingAccount {
+    type Error = NymdError;
+
+    fn try_from(value: ProtoContinuousVestingAccount) -> Result<Self, Self::Error> {
+        let base_vesting_account = value
+            .base_vesting_account
+            .map(TryFrom::try_from)
+            .transpose()?;
+
+        Ok(ContinuousVestingAccount {
+            base_vesting_account,
+            start_time: value.start_time,
+        })
+    }
+}
+
+/// DelayedVestingAccount implements the VestingAccount interface. It vests all
+/// coins after a specific time, but non prior. In other words, it keeps them
+/// locked until a specified time.
+#[derive(Debug)]
+pub struct DelayedVestingAccount {
+    pub base_vesting_account: Option<BaseVestingAccount>,
+}
+
+impl TryFrom<ProtoDelayedVestingAccount> for DelayedVestingAccount {
+    type Error = NymdError;
+
+    fn try_from(value: ProtoDelayedVestingAccount) -> Result<Self, Self::Error> {
+        let base_vesting_account = value
+            .base_vesting_account
+            .map(TryFrom::try_from)
+            .transpose()?;
+
+        Ok(DelayedVestingAccount {
+            base_vesting_account,
+        })
+    }
+}
+
+/// Period defines a length of time and amount of coins that will vest.
+#[derive(Debug)]
+pub struct Period {
+    pub length: i64,
+    pub amount: Vec<Coin>,
+}
+
+impl TryFrom<ProtoPeriod> for Period {
+    type Error = NymdError;
+
+    fn try_from(value: ProtoPeriod) -> Result<Self, Self::Error> {
+        Ok(Period {
+            length: value.length,
+            amount: parse_proto_coin_vec(value.amount)?,
+        })
+    }
+}
+
+/// PeriodicVestingAccount implements the VestingAccount interface. It
+/// periodically vests by unlocking coins during each specified period.
+#[derive(Debug)]
+pub struct PeriodicVestingAccount {
+    pub base_vesting_account: Option<BaseVestingAccount>,
+    pub start_time: i64,
+    pub vesting_periods: Vec<Period>,
+}
+
+impl TryFrom<ProtoPeriodicVestingAccount> for PeriodicVestingAccount {
+    type Error = NymdError;
+
+    fn try_from(value: ProtoPeriodicVestingAccount) -> Result<Self, Self::Error> {
+        let base_vesting_account = value
+            .base_vesting_account
+            .map(TryFrom::try_from)
+            .transpose()?;
+
+        let vesting_periods = value
+            .vesting_periods
+            .into_iter()
+            .map(TryFrom::try_from)
+            .collect::<Result<_, _>>()?;
+
+        Ok(PeriodicVestingAccount {
+            base_vesting_account,
+            start_time: value.start_time,
+            vesting_periods,
+        })
+    }
+}
+
+/// PermanentLockedAccount implements the VestingAccount interface. It does
+/// not ever release coins, locking them indefinitely. Coins in this account can
+/// still be used for delegating and for governance votes even while locked.
+#[derive(Debug)]
+pub struct PermanentLockedAccount {
+    pub base_vesting_account: Option<BaseVestingAccount>,
+}
+
+impl TryFrom<ProtoPermanentLockedAccount> for PermanentLockedAccount {
+    type Error = NymdError;
+
+    fn try_from(value: ProtoPermanentLockedAccount) -> Result<Self, Self::Error> {
+        let base_vesting_account = value
+            .base_vesting_account
+            .map(TryFrom::try_from)
+            .transpose()?;
+
+        Ok(PermanentLockedAccount {
+            base_vesting_account,
+        })
+    }
+}
+
+#[derive(Debug)]
+pub enum Account {
+    Base(BaseAccount),
+    Module(ModuleAccount),
+    BaseVesting(BaseVestingAccount),
+    ContinuousVesting(ContinuousVestingAccount),
+    DelayedVesting(DelayedVestingAccount),
+    PeriodicVesting(PeriodicVestingAccount),
+    PermanentLockedVesting(PermanentLockedAccount),
+}
+
+impl Account {
+    pub fn try_get_base_account(&self) -> Result<&BaseAccount, NymdError> {
+        match self {
+            Account::Base(acc) => Ok(acc),
+            Account::Module(acc) => acc
+                .base_account
+                .as_ref()
+                .ok_or(NymdError::NoBaseAccountInformationAvailable),
+            Account::BaseVesting(acc) => acc
+                .base_account
+                .as_ref()
+                .ok_or(NymdError::NoBaseAccountInformationAvailable),
+            Account::ContinuousVesting(acc) => acc
+                .base_vesting_account
+                .as_ref()
+                .and_then(|vesting_acc| vesting_acc.base_account.as_ref())
+                .ok_or(NymdError::NoBaseAccountInformationAvailable),
+            Account::DelayedVesting(acc) => acc
+                .base_vesting_account
+                .as_ref()
+                .and_then(|vesting_acc| vesting_acc.base_account.as_ref())
+                .ok_or(NymdError::NoBaseAccountInformationAvailable),
+            Account::PeriodicVesting(acc) => acc
+                .base_vesting_account
+                .as_ref()
+                .and_then(|vesting_acc| vesting_acc.base_account.as_ref())
+                .ok_or(NymdError::NoBaseAccountInformationAvailable),
+            Account::PermanentLockedVesting(acc) => acc
+                .base_vesting_account
+                .as_ref()
+                .and_then(|vesting_acc| vesting_acc.base_account.as_ref())
+                .ok_or(NymdError::NoBaseAccountInformationAvailable),
+        }
+    }
+}
+
+impl TryFrom<Any> for Account {
+    type Error = NymdError;
+
+    fn try_from(raw_account: Any) -> Result<Self, Self::Error> {
+        match raw_account.type_url.as_ref() {
+            "/cosmos.auth.v1beta1.BaseAccount" => Ok(Account::Base(
+                ProtoBaseAccount::decode(raw_account.value.as_ref())?.try_into()?,
+            )),
+            "/cosmos.auth.v1beta1.ModuleAccount" => Ok(Account::Module(
+                ProtoModuleAccount::decode(raw_account.value.as_ref())?.try_into()?,
+            )),
+            "/cosmos.vesting.v1beta1.BaseVestingAccount" => Ok(Account::BaseVesting(
+                ProtoBaseVestingAccount::decode(raw_account.value.as_ref())?.try_into()?,
+            )),
+            "/cosmos.vesting.v1beta1.ContinuousVestingAccount" => Ok(Account::ContinuousVesting(
+                ProtoContinuousVestingAccount::decode(raw_account.value.as_ref())?.try_into()?,
+            )),
+            "/cosmos.vesting.v1beta1.DelayedVestingAccount" => Ok(Account::DelayedVesting(
+                ProtoDelayedVestingAccount::decode(raw_account.value.as_ref())?.try_into()?,
+            )),
+            "/cosmos.vesting.v1beta1.PeriodicVestingAccount" => Ok(Account::PeriodicVesting(
+                ProtoPeriodicVestingAccount::decode(raw_account.value.as_ref())?.try_into()?,
+            )),
+            "/cosmos.vesting.v1beta1.PermanentLockedAccount" => {
+                Ok(Account::PermanentLockedVesting(
+                    ProtoPermanentLockedAccount::decode(raw_account.value.as_ref())?.try_into()?,
+                ))
+            }
+            _ => Err(NymdError::UnsupportedAccountType {
+                type_url: raw_account.type_url,
+            }),
+        }
+    }
+}
+
 #[derive(Debug)]
 pub struct Code {
     pub code_id: ContractCodeId,
@@ -403,6 +673,8 @@ pub struct MigrateResult {
 pub struct ExecuteResult {
     pub logs: Vec<Log>,
 
+    pub data: Data,
+
     /// Transaction hash (might be used as transaction ID)
     pub transaction_hash: tx::Hash,
 

common/client-libs/validator-client/src/nymd/error.rs

@@ -5,6 +5,7 @@ use crate::nymd::cosmwasm_client::types::ContractCodeId;
 use cosmrs::tendermint::{abci, block};
 use cosmrs::{bip32, tx, AccountId};
 use std::io;
+use std::time::Duration;
 use thiserror::Error;
 
 pub use cosmrs::rpc::error::{
@@ -81,21 +82,21 @@ pub enum NymdError {
     MalformedLogString,
 
     #[error(
-    "Error when broadcasting tx {hash} at height {height}. Error occurred during CheckTx phase. Code: {code}; Raw log: {raw_log}"
+    "Error when broadcasting tx {hash} at height {height:?}. Error occurred during CheckTx phase. Code: {code}; Raw log: {raw_log}"
     )]
     BroadcastTxErrorCheckTx {
         hash: tx::Hash,
-        height: block::Height,
+        height: Option<block::Height>,
         code: u32,
         raw_log: String,
     },
 
     #[error(
-    "Error when broadcasting tx {hash} at height {height}. Error occurred during DeliverTx phase. Code: {code}; Raw log: {raw_log}"
+    "Error when broadcasting tx {hash} at height {height:?}. Error occurred during DeliverTx phase. Code: {code}; Raw log: {raw_log}"
     )]
     BroadcastTxErrorDeliverTx {
         hash: tx::Hash,
-        height: block::Height,
+        height: Option<block::Height>,
         code: u32,
         raw_log: String,
     },
@@ -108,6 +109,18 @@ pub enum NymdError {
 
     #[error("Abci query failed with code {0} - {1}")]
     AbciError(u32, abci::Log),
+
+    #[error("Unsupported account type: {type_url}")]
+    UnsupportedAccountType { type_url: String },
+
+    #[error("{coin_representation} is not a valid Cosmos Coin")]
+    MalformedCoin { coin_representation: String },
+
+    #[error("This account does not have BaseAccount information available to it")]
+    NoBaseAccountInformationAvailable,
+
+    #[error("Transaction with ID {hash} has been submitted but not yet found on the chain. You might want to check for it later. There was a total wait of {} seconds", .timeout.as_secs())]
+    BroadcastTimeout { hash: tx::Hash, timeout: Duration },
 }
 
 impl NymdError {

common/client-libs/validator-client/src/nymd/mod.rs

@@ -3,12 +3,11 @@
 
 use crate::nymd::cosmwasm_client::signing_client;
 use crate::nymd::cosmwasm_client::types::{
-    ChangeAdminResult, ContractCodeId, ExecuteResult, InstantiateOptions, InstantiateResult,
-    MigrateResult, SequenceResponse, UploadResult,
+    Account, ChangeAdminResult, ContractCodeId, ExecuteResult, InstantiateOptions,
+    InstantiateResult, MigrateResult, SequenceResponse, UploadResult,
 };
 use crate::nymd::error::NymdError;
 use crate::nymd::wallet::DirectSecp256k1HdWallet;
-use cosmrs::rpc::endpoint::broadcast;
 use cosmrs::rpc::Error as TendermintRpcError;
 use cosmrs::rpc::HttpClientUrl;
 use cosmwasm_std::{Coin, Uint128};
@@ -23,12 +22,14 @@ use mixnet_contract_common::{
     PagedRewardedSetResponse, QueryMsg, RewardedSetUpdateDetails,
 };
 use serde::Serialize;
+use std::collections::HashMap;
 use std::convert::TryInto;
 
 pub use crate::nymd::cosmwasm_client::client::CosmWasmClient;
 pub use crate::nymd::cosmwasm_client::signing_client::SigningCosmWasmClient;
 pub use crate::nymd::fee::Fee;
 use crate::nymd::fee::DEFAULT_SIMULATED_GAS_MULTIPLIER;
+pub use cosmrs::bank::MsgSend;
 pub use cosmrs::rpc::endpoint::tx::Response as TxResponse;
 pub use cosmrs::rpc::endpoint::validators::Response as ValidatorResponse;
 pub use cosmrs::rpc::HttpClient as QueryNymdClient;
@@ -43,7 +44,6 @@ pub use cosmrs::tx::{self, Gas};
 pub use cosmrs::Coin as CosmosCoin;
 pub use cosmrs::{AccountId, Decimal, Denom};
 pub use signing_client::Client as SigningNymdClient;
-use std::collections::HashMap;
 pub use traits::{VestingQueryClient, VestingSigningClient};
 
 pub mod cosmwasm_client;
@@ -171,6 +171,10 @@ impl<C> NymdClient<C> {
             .ok_or(NymdError::NoContractAddressAvailable)
     }
 
+    pub fn set_simulated_gas_multiplier(&mut self, multiplier: f32) {
+        self.simulated_gas_multiplier = multiplier;
+    }
+
     pub fn address(&self) -> &AccountId
     where
         C: SigningCosmWasmClient,
@@ -226,6 +230,16 @@ impl<C> NymdClient<C> {
         self.client.get_sequence(self.address()).await
     }
 
+    pub async fn get_account_details(
+        &self,
+        address: &AccountId,
+    ) -> Result<Option<Account>, NymdError>
+    where
+        C: SigningCosmWasmClient + Sync,
+    {
+        self.client.get_account(address).await
+    }
+
     pub async fn get_current_block_timestamp(&self) -> Result<TendermintTime, NymdError>
     where
         C: CosmWasmClient + Sync,
@@ -315,6 +329,7 @@ impl<C> NymdClient<C> {
         &self,
         address: String,
         mix_identity: IdentityKey,
+        proxy: Option<String>,
     ) -> Result<Uint128, NymdError>
     where
         C: CosmWasmClient + Sync,
@@ -322,6 +337,7 @@ impl<C> NymdClient<C> {
         let request = QueryMsg::QueryDelegatorReward {
             address,
             mix_identity,
+            proxy,
         };
         self.client
             .query_contract_smart(self.mixnet_contract_address()?, &request)
@@ -331,11 +347,15 @@ impl<C> NymdClient<C> {
     pub async fn get_pending_delegation_events(
         &self,
         owner_address: String,
+        proxy_address: Option<String>,
     ) -> Result<Vec<DelegationEvent>, NymdError>
     where
         C: CosmWasmClient + Sync,
     {
-        let request = QueryMsg::GetPendingDelegationEvents { owner_address };
+        let request = QueryMsg::GetPendingDelegationEvents {
+            owner_address,
+            proxy_address,
+        };
         self.client
             .query_contract_smart(self.mixnet_contract_address()?, &request)
             .await
@@ -620,7 +640,7 @@ impl<C> NymdClient<C> {
         recipient: &AccountId,
         amount: Vec<CosmosCoin>,
         memo: impl Into<String> + Send + 'static,
-    ) -> Result<broadcast::tx_commit::Response, NymdError>
+    ) -> Result<TxResponse, NymdError>
     where
         C: SigningCosmWasmClient + Sync,
     {
@@ -635,7 +655,7 @@ impl<C> NymdClient<C> {
         &self,
         msgs: Vec<(AccountId, Vec<CosmosCoin>)>,
         memo: impl Into<String> + Send + 'static,
-    ) -> Result<broadcast::tx_commit::Response, NymdError>
+    ) -> Result<TxResponse, NymdError>
     where
         C: SigningCosmWasmClient + Sync,
     {

common/client-libs/validator-client/src/nymd/traits/vesting_signing_client.rs

@@ -256,7 +256,7 @@ impl<C: SigningCosmWasmClient + Sync + Send> VestingSigningClient for NymdClient
                 self.vesting_contract_address()?,
                 &req,
                 fee,
-                "VestingContract::DeledateToMixnode",
+                "VestingContract::DelegateToMixnode",
                 vec![],
             )
             .await

common/client-libs/validator-client/src/nymd/wallet/mod.rs

@@ -197,38 +197,45 @@ impl DirectSecp256k1HdWalletBuilder {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use network_defaults::DEFAULT_NETWORK;
+    use network_defaults::all::Network::*;
 
     #[test]
     fn generating_account_addresses() {
-        let (addr1, addr2, addr3) = match DEFAULT_NETWORK.bech32_prefix() {
-            "punk" => (
-                "punk1jw6mp7d5xqc7w6xm79lha27glmd0vdt32a3fj2",
-                "punk1h5hgn94nsq4kh99rjj794hr5h5q6yfm22mcqqn",
-                "punk17n9flp6jflljg6fp05dsy07wcprf2uuujse962",
-            ),
-            "nymt" => (
-                "nymt1jw6mp7d5xqc7w6xm79lha27glmd0vdt339me94",
-                "nymt1h5hgn94nsq4kh99rjj794hr5h5q6yfm23rjshv",
-                "nymt17n9flp6jflljg6fp05dsy07wcprf2uuufgn4d4",
-            ),
-            _ => panic!("Test needs to be updated with new bech32 prefix"),
-        };
         // test vectors produced from our js wallet
-        let mnemonic_address = vec![
-            ("crush minute paddle tobacco message debate cabin peace bar jacket execute twenty winner view sure mask popular couch penalty fragile demise fresh pizza stove", addr1),
-            ("acquire rebel spot skin gun such erupt pull swear must define ill chief turtle today flower chunk truth battle claw rigid detail gym feel", addr2),
-            ("step income throw wheat mobile ship wave drink pool sudden upset jaguar bar globe rifle spice frost bless glimpse size regular carry aspect ball", addr3)
+        let mnemonics = vec![
+            "crush minute paddle tobacco message debate cabin peace bar jacket execute twenty winner view sure mask popular couch penalty fragile demise fresh pizza stove",
+            "acquire rebel spot skin gun such erupt pull swear must define ill chief turtle today flower chunk truth battle claw rigid detail gym feel",
+            "step income throw wheat mobile ship wave drink pool sudden upset jaguar bar globe rifle spice frost bless glimpse size regular carry aspect ball"
+        ];
+        let prefixes = vec![
+            MAINNET.bech32_prefix(),
+            SANDBOX.bech32_prefix(),
+            QA.bech32_prefix(),
         ];
 
-        for (mnemonic, address) in mnemonic_address.into_iter() {
-            let prefix = DEFAULT_NETWORK.bech32_prefix();
-            let wallet =
-                DirectSecp256k1HdWallet::from_mnemonic(prefix, mnemonic.parse().unwrap()).unwrap();
-            assert_eq!(
-                wallet.try_derive_accounts().unwrap()[0].address,
-                address.parse().unwrap()
-            )
+        for prefix in prefixes {
+            let addrs = match prefix {
+                "nymt" => vec![
+                    "nymt1jw6mp7d5xqc7w6xm79lha27glmd0vdt339me94",
+                    "nymt1h5hgn94nsq4kh99rjj794hr5h5q6yfm23rjshv",
+                    "nymt17n9flp6jflljg6fp05dsy07wcprf2uuufgn4d4",
+                ],
+                "n" => vec![
+                    "n1jw6mp7d5xqc7w6xm79lha27glmd0vdt3l9artf",
+                    "n1h5hgn94nsq4kh99rjj794hr5h5q6yfm2lr52es",
+                    "n17n9flp6jflljg6fp05dsy07wcprf2uuu8g40rf",
+                ],
+                _ => panic!("Test needs to be updated with new bech32 prefix"),
+            };
+            for (idx, mnemonic) in mnemonics.iter().enumerate() {
+                let wallet =
+                    DirectSecp256k1HdWallet::from_mnemonic(prefix, mnemonic.parse().unwrap())
+                        .unwrap();
+                assert_eq!(
+                    wallet.try_derive_accounts().unwrap()[0].address,
+                    addrs[idx].parse().unwrap()
+                )
+            }
         }
     }
 }

common/client-libs/validator-client/src/validator_api/mod.rs

@@ -10,7 +10,7 @@ use std::collections::HashMap;
 use url::Url;
 use validator_api_requests::models::{
     CoreNodeStatusResponse, InclusionProbabilityResponse, MixnodeStatusResponse,
-    RewardEstimationResponse, StakeSaturationResponse,
+    RewardEstimationResponse, StakeSaturationResponse, UptimeResponse,
 };
 
 pub mod error;
@@ -253,6 +253,36 @@ impl Client {
         .await
     }
 
+    pub async fn get_mixnode_avg_uptime(
+        &self,
+        identity: IdentityKeyRef<'_>,
+    ) -> Result<UptimeResponse, ValidatorAPIError> {
+        self.query_validator_api(
+            &[
+                routes::API_VERSION,
+                routes::STATUS_ROUTES,
+                routes::MIXNODE,
+                identity,
+                routes::AVG_UPTIME,
+            ],
+            NO_PARAMS,
+        )
+        .await
+    }
+
+    pub async fn get_mixnode_avg_uptimes(&self) -> Result<Vec<UptimeResponse>, ValidatorAPIError> {
+        self.query_validator_api(
+            &[
+                routes::API_VERSION,
+                routes::STATUS_ROUTES,
+                routes::MIXNODES,
+                routes::AVG_UPTIME,
+            ],
+            NO_PARAMS,
+        )
+        .await
+    }
+
     pub async fn blind_sign(
         &self,
         request_body: &BlindSignRequestBody,

common/client-libs/validator-client/src/validator_api/routes.rs

@@ -26,5 +26,6 @@ pub const SINCE_ARG: &str = "since";
 
 pub const STATUS: &str = "status";
 pub const REWARD_ESTIMATION: &str = "reward-estimation";
+pub const AVG_UPTIME: &str = "avg_uptime";
 pub const STAKE_SATURATION: &str = "stake-saturation";
 pub const INCLUSION_CHANCE: &str = "inclusion-probability";

common/coconut-interface/src/error.rs

@@ -10,4 +10,10 @@ pub enum CoconutInterfaceError {
 
     #[error("Could not decode base 58 string - {0}")]
     MalformedString(#[from] bs58::decode::Error),
+
+    #[error("Not enough public attributes were specified")]
+    NotEnoughPublicAttributes,
+
+    #[error("Could not recover bandwidth value")]
+    InvalidBandwidth,
 }

common/coconut-interface/src/lib.rs

@@ -5,6 +5,7 @@ pub mod error;
 
 use getset::{CopyGetters, Getters};
 use serde::{Deserialize, Serialize};
+use std::str::FromStr;
 
 use error::CoconutInterfaceError;
 
@@ -24,9 +25,11 @@ impl Credential {
     pub fn new(
         n_params: u32,
         theta: Theta,
-        public_attributes: Vec<Vec<u8>>,
+        voucher_value: String,
+        voucher_info: String,
         signature: &Signature,
     ) -> Credential {
+        let public_attributes = vec![voucher_value.into_bytes(), voucher_info.into_bytes()];
         Credential {
             n_params,
             theta,
@@ -35,8 +38,18 @@ impl Credential {
         }
     }
 
-    pub fn public_attributes(&self) -> Vec<Vec<u8>> {
-        self.public_attributes.clone()
+    pub fn voucher_value(&self) -> Result<u64, CoconutInterfaceError> {
+        let bandwidth_vec = self
+            .public_attributes
+            .get(0)
+            .ok_or(CoconutInterfaceError::NotEnoughPublicAttributes)?
+            .to_owned();
+        let bandwidth_str = String::from_utf8(bandwidth_vec)
+            .map_err(|_| CoconutInterfaceError::InvalidBandwidth)?;
+        let value =
+            u64::from_str(&bandwidth_str).map_err(|_| CoconutInterfaceError::InvalidBandwidth)?;
+
+        Ok(value)
     }
 
     pub fn verify(&self, verification_key: &VerificationKey) -> bool {

common/config/Cargo.toml

@@ -7,6 +7,7 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+cfg-if = "1.0.0"
 handlebars = "3.0.1"
 humantime-serde = "1.0"
 log = "0.4"

common/config/src/lib.rs

@@ -4,6 +4,8 @@
 use handlebars::Handlebars;
 use serde::de::DeserializeOwned;
 use serde::Serialize;
+#[cfg(unix)]
+use std::os::unix::fs::PermissionsExt;
 use std::path::PathBuf;
 use std::{fs, io};
 
@@ -64,11 +66,21 @@ pub trait NymConfig: Default + Serialize + DeserializeOwned {
             None => fs::create_dir_all(self.config_directory()),
         }?;
 
-        fs::write(
-            custom_location
-                .unwrap_or_else(|| self.config_directory().join(Self::config_file_name())),
-            templated_config,
-        )
+        let location = custom_location
+            .unwrap_or_else(|| self.config_directory().join(Self::config_file_name()));
+
+        cfg_if::cfg_if! {
+            if #[cfg(unix)] {
+                fs::write(location.clone(), templated_config)?;
+                let mut perms = fs::metadata(location.clone())?.permissions();
+                perms.set_mode(0o600);
+                fs::set_permissions(location, perms)?;
+            } else {
+                fs::write(location, templated_config)?;
+            }
+        }
+
+        Ok(())
     }
 
     fn load_from_file(id: Option<&str>) -> io::Result<Self> {

common/cosmwasm-smart-contracts/coconut-bandwidth-contract/Cargo.toml

@@ -6,5 +6,6 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+cosmwasm-std = "1.0.0-beta6"
 schemars = "0.8"
 serde = { version = "1.0.103", default-features = false, features = ["derive"] }

common/cosmwasm-smart-contracts/coconut-bandwidth-contract/src/msg.rs

@@ -1,18 +1,23 @@
 // Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
 // SPDX-License-Identifier: Apache-2.0
 
+use cosmwasm_std::Coin;
 use schemars::JsonSchema;
 use serde::{Deserialize, Serialize};
 
 use crate::deposit::DepositData;
 
 #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)]
-pub struct InstantiateMsg {}
+pub struct InstantiateMsg {
+    pub multisig_addr: String,
+    pub pool_addr: String,
+}
 
 #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)]
 #[serde(rename_all = "snake_case")]
 pub enum ExecuteMsg {
     DepositFunds { data: DepositData },
+    ReleaseFunds { funds: Coin },
 }
 
 #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)]

common/cosmwasm-smart-contracts/contracts-common/Cargo.toml

@@ -7,4 +7,4 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-cosmwasm-std = "1.0.0-beta6"
+cosmwasm-std = "1.0.0-beta8"

common/cosmwasm-smart-contracts/mixnet-contract/Cargo.toml

@@ -7,7 +7,7 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-cosmwasm-std = "1.0.0-beta6"
+cosmwasm-std = "1.0.0-beta8"
 
 serde = { version = "1.0", features = ["derive"] }
 serde_repr = "0.1"

common/cosmwasm-smart-contracts/mixnet-contract/src/error.rs

@@ -13,4 +13,11 @@ pub enum MixnetContractError {
     },
     #[error("Error casting from U128")]
     CastError,
+    #[error("{source}")]
+    StdErr {
+        #[from]
+        source: cosmwasm_std::StdError,
+    },
+    #[error("Division by zero at {}", line!())]
+    DivisionByZero,
 }

common/cosmwasm-smart-contracts/mixnet-contract/src/interval.rs

@@ -2,6 +2,9 @@
 // SPDX-License-Identifier: Apache-2.0
 
 use cosmwasm_std::Env;
+use schemars::gen::SchemaGenerator;
+use schemars::schema::{InstanceType, Schema, SchemaObject};
+use schemars::JsonSchema;
 use serde::{Deserialize, Serialize};
 use std::convert::TryInto;
 use std::fmt::{Display, Formatter};
@@ -64,6 +67,39 @@ pub struct Interval {
     length: Duration,
 }
 
+impl JsonSchema for Interval {
+    fn schema_name() -> String {
+        "Interval".to_owned()
+    }
+
+    fn json_schema(gen: &mut SchemaGenerator) -> Schema {
+        let mut schema_object = SchemaObject {
+            instance_type: Some(InstanceType::Object.into()),
+            ..SchemaObject::default()
+        };
+
+        let object_validation = schema_object.object();
+        object_validation
+            .properties
+            .insert("id".to_owned(), gen.subschema_for::<u32>());
+        object_validation.required.insert("id".to_owned());
+
+        // PrimitiveDateTime does not implement JsonSchema. However it has a custom
+        // serialization to string, so we just specify the schema to be String.
+        object_validation
+            .properties
+            .insert("start".to_owned(), gen.subschema_for::<String>());
+        object_validation.required.insert("start".to_owned());
+
+        object_validation
+            .properties
+            .insert("length".to_owned(), gen.subschema_for::<Duration>());
+        object_validation.required.insert("length".to_owned());
+
+        Schema::Object(schema_object)
+    }
+}
+
 impl Interval {
     /// Initialize epoch in the contract with default values.
     pub fn init_epoch(env: Env) -> Self {

common/cosmwasm-smart-contracts/mixnet-contract/src/mixnode.rs

@@ -222,13 +222,19 @@ impl DelegatorRewardParams {
     }
 
     pub fn determine_delegation_reward(&self, delegation_amount: Uint128) -> u128 {
+        if self.sigma == 0 {
+            return 0;
+        }
+
         // change all values into their fixed representations
         let delegation_amount = U128::from_num(delegation_amount.u128());
         let circulating_supply = U128::from_num(self.reward_params.circulating_supply());
 
         let scaled_delegation_amount = delegation_amount / circulating_supply;
+
+        // Div by zero checked above
         let delegator_reward =
-            (ONE - self.profit_margin) * scaled_delegation_amount / self.sigma * self.node_profit;
+            (ONE - self.profit_margin) * (scaled_delegation_amount / self.sigma) * self.node_profit;
 
         let reward = delegator_reward.max(U128::ZERO);
         if let Some(int_reward) = reward.checked_cast() {
@@ -250,8 +256,14 @@ impl DelegatorRewardParams {
 #[derive(Debug, Clone, JsonSchema, PartialEq, Serialize, Deserialize, Copy)]
 pub struct StoredNodeRewardResult {
     reward: Uint128,
-    lambda: Uint128,
-    sigma: Uint128,
+
+    #[schemars(with = "String")]
+    #[serde(with = "fixed_U128_as_string")]
+    lambda: U128,
+
+    #[schemars(with = "String")]
+    #[serde(with = "fixed_U128_as_string")]
+    sigma: U128,
 }
 
 impl StoredNodeRewardResult {
@@ -259,11 +271,11 @@ impl StoredNodeRewardResult {
         self.reward
     }
 
-    pub fn lambda(&self) -> Uint128 {
+    pub fn lambda(&self) -> U128 {
         self.lambda
     }
 
-    pub fn sigma(&self) -> Uint128 {
+    pub fn sigma(&self) -> U128 {
         self.sigma
     }
 }
@@ -279,18 +291,8 @@ impl TryFrom<NodeRewardResult> for StoredNodeRewardResult {
                     .checked_cast()
                     .ok_or(MixnetContractError::CastError)?,
             ),
-            lambda: Uint128::new(
-                node_reward_result
-                    .lambda()
-                    .checked_cast()
-                    .ok_or(MixnetContractError::CastError)?,
-            ),
-            sigma: Uint128::new(
-                node_reward_result
-                    .sigma()
-                    .checked_cast()
-                    .ok_or(MixnetContractError::CastError)?,
-            ),
+            lambda: node_reward_result.lambda(),
+            sigma: node_reward_result.sigma(),
         })
     }
 }
@@ -426,17 +428,17 @@ impl MixNodeBond {
         &self,
         params: &RewardParams,
     ) -> Result<(u64, u64, u64), MixnetContractError> {
-        let total_node_reward = self.reward(params);
+        let total_node_reward = self
+            .reward(params)
+            .reward()
+            .checked_to_num::<u128>()
+            .unwrap_or_default();
         let operator_reward = self.operator_reward(params);
-        // TODO: This overestimates the reward by a lot, it should take a Uint128 and return estiamte for that
-        let delegators_reward = self.reward_delegation(self.total_delegation().amount, params);
+        // Total reward has to be the sum of operator and delegator rewards
+        let delegators_reward = total_node_reward - operator_reward;
 
         Ok((
-            total_node_reward
-                .reward()
-                .checked_to_num::<u128>()
-                .unwrap_or_default()
-                .try_into()?,
+            total_node_reward.try_into()?,
             operator_reward.try_into()?,
             delegators_reward.try_into()?,
         ))
@@ -469,12 +471,16 @@ impl MixNodeBond {
 
     pub fn operator_reward(&self, params: &RewardParams) -> u128 {
         let reward = self.reward(params);
+        if reward.sigma == 0 {
+            return 0;
+        }
         let profit = if reward.reward < params.node.operator_cost() {
             U128::from_num(0u128)
         } else {
             reward.reward - params.node.operator_cost()
         };
         let operator_base_reward = reward.reward.min(params.node.operator_cost());
+        // Div by zero checked above
         let operator_reward = (self.profit_margin()
             + (ONE - self.profit_margin()) * reward.lambda / reward.sigma)
             * profit;

common/cosmwasm-smart-contracts/mixnet-contract/src/msg.rs

@@ -171,9 +171,18 @@ pub enum QueryMsg {
     QueryDelegatorReward {
         address: String,
         mix_identity: IdentityKey,
+        proxy: Option<String>,
     },
     GetPendingDelegationEvents {
         owner_address: String,
+        proxy_address: Option<String>,
+    },
+    GetCheckpointsForMixnode {
+        mix_identity: IdentityKey,
+    },
+    GetMixnodeAtHeight {
+        mix_identity: IdentityKey,
+        height: u64,
     },
 }
 

common/cosmwasm-smart-contracts/mixnet-contract/src/reward_params.rs

@@ -25,11 +25,11 @@ impl NodeEpochRewards {
         self.epoch_id
     }
 
-    pub fn sigma(&self) -> Uint128 {
+    pub fn sigma(&self) -> U128 {
         self.result.sigma()
     }
 
-    pub fn lambda(&self) -> Uint128 {
+    pub fn lambda(&self) -> U128 {
         self.result.lambda()
     }
 
@@ -47,20 +47,19 @@ impl NodeEpochRewards {
 
     pub fn node_profit(&self) -> U128 {
         let reward = U128::from_num(self.reward().u128());
-        if reward < self.operator_cost() {
-            U128::from_num(0u128)
-        } else {
-            reward - self.operator_cost()
-        }
+        // if operating cost is higher then the reward node profit is 0
+        reward.saturating_sub(self.operator_cost())
     }
 
     pub fn operator_reward(&self, profit_margin: U128) -> Result<Uint128, MixnetContractError> {
         let reward = self.node_profit();
         let operator_base_reward = reward.min(self.operator_cost());
-        let operator_reward = (profit_margin
-            + (ONE - profit_margin) * U128::from_num(self.lambda().u128())
-                / U128::from_num(self.sigma().u128()))
-            * reward;
+        let div_by_zero_check = if let Some(value) = self.lambda().checked_div(self.sigma()) {
+            value
+        } else {
+            return Err(MixnetContractError::DivisionByZero);
+        };
+        let operator_reward = (profit_margin + (ONE - profit_margin) * div_by_zero_check) * reward;
 
         let reward = (operator_reward + operator_base_reward).max(U128::from_num(0u128));
 
@@ -82,9 +81,15 @@ impl NodeEpochRewards {
         let circulating_supply = U128::from_num(epoch_reward_params.circulating_supply());
 
         let scaled_delegation_amount = delegation_amount / circulating_supply;
-        let delegator_reward = (ONE - profit_margin) * scaled_delegation_amount
-            / U128::from_num(self.sigma().u128())
-            * self.node_profit();
+
+        let check_div_by_zero =
+            if let Some(value) = scaled_delegation_amount.checked_div(self.sigma()) {
+                value
+            } else {
+                return Err(MixnetContractError::DivisionByZero);
+            };
+
+        let delegator_reward = (ONE - profit_margin) * check_div_by_zero * self.node_profit();
 
         let reward = delegator_reward.max(U128::ZERO);
         if let Some(int_reward) = reward.checked_cast() {
@@ -201,6 +206,11 @@ impl RewardParams {
         let denom = self.active_set_work_factor() * U128::from_num(self.rewarded_set_size())
             - (self.active_set_work_factor() - ONE) * U128::from_num(self.idle_nodes().u128());
 
+        if denom == 0 {
+            return U128::ZERO;
+        }
+
+        // Div by zero checked above
         if self.in_active_set() {
             // work_active = factor / (factor * self.network.k[month] - (factor - 1) * idle_nodes)
             self.active_set_work_factor() / denom * self.rewarded_set_size()

common/cosmwasm-smart-contracts/vesting-contract/Cargo.toml

@@ -6,11 +6,11 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-cosmwasm-std = "1.0.0-beta6"
+cosmwasm-std = "1.0.0-beta8"
 mixnet-contract-common = { path = "../mixnet-contract" }
 serde = { version = "1.0", features = ["derive"] }
 schemars = "0.8"
-cw-storage-plus = "0.13.1"
+cw-storage-plus = "0.13.2"
 config = { path = "../../config" }
 
 [dev-dependencies]

common/cosmwasm-smart-contracts/vesting-contract/src/messages.rs

@@ -49,6 +49,10 @@ impl VestingSpecification {
 #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)]
 #[serde(rename_all = "snake_case")]
 pub enum ExecuteMsg {
+    CompoundDelegatorReward {
+        mix_identity: String,
+    },
+    CompoundOperatorReward {},
     UpdateMixnodeConfig {
         profit_margin_percent: u8,
     },

common/credential-storage/Cargo.toml

@@ -0,0 +1,20 @@
+[package]
+name = "credential-storage"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+async-trait = { version = "0.1.51" }
+nymcoconut = { path = "../nymcoconut" }
+
+log = "0.4"
+sqlx = { version = "0.5", features = ["runtime-tokio-rustls", "sqlite", "macros", "migrate"]}
+thiserror = "1.0"
+tokio = { version = "1.4", features = [ "rt-multi-thread", "net", "signal", "fs" ] }
+
+
+[build-dependencies]
+sqlx = { version = "0.5", features = ["runtime-tokio-rustls", "sqlite", "macros", "migrate"] }
+tokio = { version = "1.4", features = ["rt-multi-thread", "macros"] }

common/credential-storage/build.rs

@@ -0,0 +1,30 @@
+/*
+ * Copyright 2022 - Nym Technologies SA <contact@nymtech.net>
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+use sqlx::{Connection, SqliteConnection};
+use std::env;
+
+#[tokio::main]
+async fn main() {
+    let out_dir = env::var("OUT_DIR").unwrap();
+    let database_path = format!("{}/coconut-credential-example.sqlite", out_dir);
+
+    let mut conn = SqliteConnection::connect(&*format!("sqlite://{}?mode=rwc", database_path))
+        .await
+        .expect("Failed to create SQLx database connection");
+
+    sqlx::migrate!("./migrations")
+        .run(&mut conn)
+        .await
+        .expect("Failed to perform SQLx migrations");
+
+    #[cfg(target_family = "unix")]
+    println!("cargo:rustc-env=DATABASE_URL=sqlite://{}", &database_path);
+
+    #[cfg(target_family = "windows")]
+    // for some strange reason we need to add a leading `/` to the windows path even though it's
+    // not a valid windows path... but hey, it works...
+    println!("cargo:rustc-env=DATABASE_URL=sqlite:///{}", &database_path);
+}

common/credential-storage/migrations/20220408120000_initial_tables.sql

@@ -0,0 +1,22 @@
+/*
+ * Copyright 2022 - Nym Technologies SA <contact@nymtech.net>
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+CREATE TABLE coconut_credentials
+(
+    id                  INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
+    voucher_value       TEXT    NOT NULL,
+    voucher_info        TEXT    NOT NULL,
+    serial_number       TEXT    NOT NULL,
+    binding_number      TEXT    NOT NULL,
+    signature           TEXT    NOT NULL UNIQUE
+);
+
+CREATE TABLE erc20_credentials
+(
+    id                  INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
+    public_key          TEXT    NOT NULL,
+    private_key         TEXT    NOT NULL,
+    consumed            BOOLEAN NOT NULL
+);

common/credential-storage/src/coconut.rs

@@ -0,0 +1,67 @@
+// Copyright 2022 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use crate::models::CoconutCredential;
+
+#[derive(Clone)]
+pub(crate) struct CoconutCredentialManager {
+    connection_pool: sqlx::SqlitePool,
+}
+
+impl CoconutCredentialManager {
+    /// Creates new instance of the `CoconutCredentialManager` with the provided sqlite connection pool.
+    ///
+    /// # Arguments
+    ///
+    /// * `connection_pool`: database connection pool to use.
+    pub(crate) fn new(connection_pool: sqlx::SqlitePool) -> Self {
+        CoconutCredentialManager { connection_pool }
+    }
+
+    /// Inserts provided signature into the database.
+    ///
+    /// # Arguments
+    ///
+    /// * `voucher_value`: Plaintext bandwidth value of the credential.
+    /// * `voucher_info`: Plaintext information of the credential.
+    /// * `serial_number`: Base58 representation of the serial number attribute.
+    /// * `binding_number`: Base58 representation of the binding number attribute.
+    /// * `signature`: Coconut credential in the form of a signature.
+    pub(crate) async fn insert_coconut_credential(
+        &self,
+        voucher_value: String,
+        voucher_info: String,
+        serial_number: String,
+        binding_number: String,
+        signature: String,
+    ) -> Result<(), sqlx::Error> {
+        sqlx::query!(
+            "INSERT INTO coconut_credentials(voucher_value, voucher_info, serial_number, binding_number, signature) VALUES (?, ?, ?, ?, ?)",
+            voucher_value, voucher_info, serial_number, binding_number, signature
+        )
+        .execute(&self.connection_pool)
+        .await?;
+        Ok(())
+    }
+
+    /// Tries to retrieve one of the stored, unused credentials.
+    pub(crate) async fn get_next_coconut_credential(
+        &self,
+    ) -> Result<CoconutCredential, sqlx::Error> {
+        sqlx::query_as!(CoconutCredential, "SELECT * FROM coconut_credentials")
+            .fetch_one(&self.connection_pool)
+            .await
+    }
+
+    /// Removes from the database the specified credential.
+    ///
+    /// # Arguments
+    ///
+    /// * `id`: Database id.
+    pub(crate) async fn remove_coconut_credential(&self, id: i64) -> Result<(), sqlx::Error> {
+        sqlx::query!("DELETE FROM coconut_credentials WHERE id = ?", id)
+            .execute(&self.connection_pool)
+            .await?;
+        Ok(())
+    }
+}

common/credential-storage/src/erc20.rs

@@ -0,0 +1,71 @@
+// Copyright 2022 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use crate::models::ERC20Credential;
+
+#[derive(Clone)]
+pub(crate) struct ERC20CredentialManager {
+    connection_pool: sqlx::SqlitePool,
+}
+
+impl ERC20CredentialManager {
+    /// Creates new instance of the `ERC20CredentialManager` with the provided sqlite connection pool.
+    ///
+    /// # Arguments
+    ///
+    /// * `connection_pool`: database connection pool to use.
+    pub(crate) fn new(connection_pool: sqlx::SqlitePool) -> Self {
+        ERC20CredentialManager { connection_pool }
+    }
+
+    /// Inserts provided signature into the database.
+    ///
+    /// # Arguments
+    ///
+    /// * `public_key`: Base58 representation of a public key.
+    /// * `private_key`: Base58 representation of a private key.
+    pub(crate) async fn insert_erc20_credential(
+        &self,
+        public_key: String,
+        private_key: String,
+    ) -> Result<(), sqlx::Error> {
+        sqlx::query!(
+            "INSERT INTO erc20_credentials(public_key, private_key, consumed) VALUES (?, ?, ?)",
+            public_key,
+            private_key,
+            false,
+        )
+        .execute(&self.connection_pool)
+        .await?;
+        Ok(())
+    }
+
+    /// Tries to retrieve one of the stored, unused credentials.
+    pub(crate) async fn get_next_erc20_credential(&self) -> Result<ERC20Credential, sqlx::Error> {
+        sqlx::query_as!(
+            ERC20Credential,
+            "SELECT * FROM erc20_credentials WHERE consumed = false"
+        )
+        .fetch_one(&self.connection_pool)
+        .await
+    }
+
+    /// Mark a credential as being consumed.
+    pub(crate) async fn consume_erc20_credential(
+        &self,
+        public_key: String,
+    ) -> Result<(), sqlx::Error> {
+        sqlx::query!(
+            r#"
+                UPDATE erc20_credentials
+                SET consumed = true
+                WHERE public_key = ?
+            "#,
+            public_key
+        )
+        .execute(&self.connection_pool)
+        .await?;
+
+        Ok(())
+    }
+}

common/credential-storage/src/error.rs

@@ -0,0 +1,16 @@
+// Copyright 2022 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use thiserror::Error;
+
+#[derive(Error, Debug)]
+pub enum StorageError {
+    #[error("Database experienced an internal error - {0}")]
+    InternalDatabaseError(#[from] sqlx::Error),
+
+    #[error("Failed to perform database migration - {0}")]
+    MigrationError(#[from] sqlx::migrate::MigrateError),
+
+    #[error("Inconsistent data in database")]
+    InconsistentData,
+}

common/credential-storage/src/lib.rs

@@ -0,0 +1,144 @@
+/*
+ * Copyright 2022 - Nym Technologies SA <contact@nymtech.net>
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+use crate::coconut::CoconutCredentialManager;
+use crate::erc20::ERC20CredentialManager;
+use crate::error::StorageError;
+use crate::storage::Storage;
+
+use crate::models::{CoconutCredential, ERC20Credential};
+use async_trait::async_trait;
+use log::{debug, error};
+use sqlx::ConnectOptions;
+use std::path::{Path, PathBuf};
+
+mod coconut;
+mod erc20;
+pub mod error;
+mod models;
+pub mod storage;
+
+// note that clone here is fine as upon cloning the same underlying pool will be used
+#[derive(Clone)]
+pub struct PersistentStorage {
+    coconut_credential_manager: CoconutCredentialManager,
+    erc20_credential_manager: ERC20CredentialManager,
+}
+
+impl PersistentStorage {
+    /// Initialises `PersistentStorage` using the provided path.
+    ///
+    /// # Arguments
+    ///
+    /// * `database_path`: path to the database.
+    pub async fn init<P: AsRef<Path> + Send>(database_path: P) -> Result<Self, StorageError> {
+        debug!(
+            "Attempting to connect to database {:?}",
+            database_path.as_ref().as_os_str()
+        );
+
+        let mut opts = sqlx::sqlite::SqliteConnectOptions::new()
+            .filename(database_path)
+            .create_if_missing(true);
+
+        opts.disable_statement_logging();
+
+        let connection_pool = match sqlx::SqlitePool::connect_with(opts).await {
+            Ok(db) => db,
+            Err(err) => {
+                error!("Failed to connect to SQLx database: {}", err);
+                return Err(err.into());
+            }
+        };
+
+        if let Err(err) = sqlx::migrate!("./migrations").run(&connection_pool).await {
+            error!("Failed to perform migration on the SQLx database: {}", err);
+            return Err(err.into());
+        }
+
+        Ok(PersistentStorage {
+            coconut_credential_manager: CoconutCredentialManager::new(connection_pool.clone()),
+            erc20_credential_manager: ERC20CredentialManager::new(connection_pool),
+        })
+    }
+}
+
+#[async_trait]
+impl Storage for PersistentStorage {
+    async fn insert_coconut_credential(
+        &self,
+        voucher_value: String,
+        voucher_info: String,
+        serial_number: String,
+        binding_number: String,
+        signature: String,
+    ) -> Result<(), StorageError> {
+        self.coconut_credential_manager
+            .insert_coconut_credential(
+                voucher_value,
+                voucher_info,
+                serial_number,
+                binding_number,
+                signature,
+            )
+            .await?;
+
+        Ok(())
+    }
+
+    async fn get_next_coconut_credential(&self) -> Result<CoconutCredential, StorageError> {
+        let credential = self
+            .coconut_credential_manager
+            .get_next_coconut_credential()
+            .await?;
+
+        Ok(credential)
+    }
+
+    async fn remove_coconut_credential(&self, id: i64) -> Result<(), StorageError> {
+        self.coconut_credential_manager
+            .remove_coconut_credential(id)
+            .await?;
+
+        Ok(())
+    }
+
+    async fn insert_erc20_credential(
+        &self,
+        public_key: String,
+        private_key: String,
+    ) -> Result<(), StorageError> {
+        self.erc20_credential_manager
+            .insert_erc20_credential(public_key, private_key)
+            .await?;
+
+        Ok(())
+    }
+
+    async fn get_next_erc20_credential(&self) -> Result<ERC20Credential, StorageError> {
+        let credential = self
+            .erc20_credential_manager
+            .get_next_erc20_credential()
+            .await?;
+
+        Ok(credential)
+    }
+
+    async fn consume_erc20_credential(&self, public_key: String) -> Result<(), StorageError> {
+        let credential = self
+            .erc20_credential_manager
+            .consume_erc20_credential(public_key)
+            .await?;
+
+        Ok(credential)
+    }
+}
+
+pub async fn initialise_storage(path: PathBuf) -> PersistentStorage {
+    match PersistentStorage::init(path).await {
+        Err(err) => panic!("failed to initialise credential storage - {}", err),
+        Ok(storage) => storage,
+    }
+}

common/credential-storage/src/models.rs

@@ -0,0 +1,20 @@
+// Copyright 2022 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+pub struct CoconutCredential {
+    #[allow(dead_code)]
+    pub id: i64,
+    pub voucher_value: String,
+    pub voucher_info: String,
+    pub serial_number: String,
+    pub binding_number: String,
+    pub signature: String,
+}
+
+pub struct ERC20Credential {
+    #[allow(dead_code)]
+    pub id: i64,
+    pub public_key: String,
+    pub private_key: String,
+    pub consumed: bool,
+}

common/credential-storage/src/storage.rs

@@ -0,0 +1,52 @@
+// Copyright 2022 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use async_trait::async_trait;
+
+use crate::models::{CoconutCredential, ERC20Credential};
+use crate::StorageError;
+
+#[async_trait]
+pub trait Storage: Send + Sync {
+    /// Inserts provided signature into the database.
+    ///
+    /// # Arguments
+    ///
+    /// * `signature`: Coconut credential in the form of a signature.
+    async fn insert_coconut_credential(
+        &self,
+        voucher_value: String,
+        voucher_info: String,
+        serial_number: String,
+        binding_number: String,
+        signature: String,
+    ) -> Result<(), StorageError>;
+
+    /// Tries to retrieve one of the stored, unused credentials.
+    async fn get_next_coconut_credential(&self) -> Result<CoconutCredential, StorageError>;
+
+    /// Removes from the database the specified credential.
+    ///
+    /// # Arguments
+    ///
+    /// * `signature`: Coconut credential in the form of a signature.
+    async fn remove_coconut_credential(&self, id: i64) -> Result<(), StorageError>;
+
+    /// Inserts provided signature into the database.
+    ///
+    /// # Arguments
+    ///
+    /// * `public_key`: Base58 representation of a public key.
+    /// * `private_key`: Base58 representation of a private key.
+    async fn insert_erc20_credential(
+        &self,
+        public_key: String,
+        private_key: String,
+    ) -> Result<(), StorageError>;
+
+    /// Tries to retrieve one of the stored, unused credential data.
+    async fn get_next_erc20_credential(&self) -> Result<ERC20Credential, StorageError>;
+
+    /// Mark a credential as being consumed.
+    async fn consume_erc20_credential(&self, public_key: String) -> Result<(), StorageError>;
+}

common/credentials/src/coconut/bandwidth.rs

@@ -11,7 +11,6 @@ use coconut_interface::{
     PrivateAttribute, PublicAttribute, Signature, VerificationKey,
 };
 use crypto::asymmetric::{encryption, identity};
-use network_defaults::BANDWIDTH_VALUE;
 
 use cosmrs::tx::Hash;
 
@@ -159,29 +158,27 @@ impl BandwidthVoucher {
 
     pub fn sign(&self, request: &BlindSignRequest) -> identity::Signature {
         let mut message = request.to_bytes();
-        message.extend_from_slice(self.tx_hash.as_bytes());
+        message.extend_from_slice(self.tx_hash.to_string().as_bytes());
         self.signing_key.sign(&message)
     }
 }
 
 pub fn prepare_for_spending(
-    raw_identity: &[u8],
+    voucher_value: u64,
+    voucher_info: String,
+    serial_number: PrivateAttribute,
+    binding_number: PrivateAttribute,
     signature: &Signature,
-    attributes: &BandwidthVoucher,
     verification_key: &VerificationKey,
 ) -> Result<Credential, Error> {
-    let public_attributes = vec![
-        raw_identity.to_vec(),
-        BANDWIDTH_VALUE.to_be_bytes().to_vec(),
-    ];
-
     let params = Parameters::new(TOTAL_ATTRIBUTES)?;
 
     prepare_credential_for_spending(
         &params,
-        public_attributes,
-        attributes.serial_number,
-        attributes.binding_number,
+        voucher_value,
+        voucher_info,
+        serial_number,
+        binding_number,
         signature,
         verification_key,
     )

common/credentials/src/coconut/utils.rs

@@ -11,7 +11,7 @@ use crypto::shared_key::recompute_shared_key;
 use crypto::symmetric::stream_cipher;
 use url::Url;
 
-use crate::coconut::bandwidth::{BandwidthVoucher, PRIVATE_ATTRIBUTES};
+use crate::coconut::bandwidth::{BandwidthVoucher, PRIVATE_ATTRIBUTES, PUBLIC_ATTRIBUTES};
 use crate::coconut::params::{
     ValidatorApiCredentialEncryptionAlgorithm, ValidatorApiCredentialHkdfAlgorithm,
 };
@@ -175,7 +175,8 @@ pub async fn obtain_aggregate_signature(
 // TODO: better type flow
 pub fn prepare_credential_for_spending(
     params: &Parameters,
-    public_attributes: Vec<Vec<u8>>,
+    voucher_value: u64,
+    voucher_info: String,
     serial_number: Attribute,
     binding_number: Attribute,
     signature: &Signature,
@@ -190,9 +191,10 @@ pub fn prepare_credential_for_spending(
     )?;
 
     Ok(Credential::new(
-        (public_attributes.len() + PRIVATE_ATTRIBUTES as usize) as u32,
+        PUBLIC_ATTRIBUTES + PRIVATE_ATTRIBUTES,
         theta,
-        public_attributes,
+        voucher_value.to_string(),
+        voucher_info,
         signature,
     ))
 }

common/credentials/src/error.rs

@@ -2,7 +2,7 @@
 // SPDX-License-Identifier: Apache-2.0
 
 #[cfg(feature = "coconut")]
-use coconut_interface::CoconutError;
+use coconut_interface::{error::CoconutInterfaceError, CoconutError};
 use crypto::asymmetric::encryption::KeyRecoveryError;
 use validator_client::ValidatorClientError;
 
@@ -17,18 +17,16 @@ pub enum Error {
     NoValidatorsAvailable,
 
     #[cfg(feature = "coconut")]
-    #[error("Run into a coconut error - {0}")]
+    #[error("Ran into a coconut error - {0}")]
     CoconutError(#[from] CoconutError),
 
-    #[error("Run into a validato client error - {0}")]
+    #[cfg(feature = "coconut")]
+    #[error("Ran into a coconut interface error - {0}")]
+    CoconutInterfaceError(#[from] CoconutInterfaceError),
+
+    #[error("Ran into a validator client error - {0}")]
     ValidatorClientError(#[from] ValidatorClientError),
 
-    #[error("Not enough public attributes were specified")]
-    NotEnoughPublicAttributes,
-
-    #[error("Bandwidth is expected to be represented on 8 bytes")]
-    InvalidBandwidthSize,
-
     #[error("Bandwidth operation overflowed. {0}")]
     BandwidthOverflow(String),
 

common/crypto/Cargo.toml

@@ -19,6 +19,8 @@ cipher = { version = "0.4.3", optional = true }
 x25519-dalek = { version = "1.1", optional = true }
 ed25519-dalek = { version = "1.0", optional = true }
 rand = { version = "0.7.3", features = ["wasm-bindgen"], optional = true }
+serde_bytes = { version = "0.11.6", optional = true }
+serde_crate = { version = "1.0", optional = true, default_features = false, package = "serde" }
 subtle-encoding = { version = "0.5", features =  ["bech32-preview"]}
 
 # internal
@@ -30,6 +32,7 @@ config = { path="../../common/config" }
 rand_chacha = "0.2"
 
 [features]
+serde = ["serde_crate", "serde_bytes", "ed25519-dalek/serde", "x25519-dalek/serde"]
 asymmetric = ["x25519-dalek", "ed25519-dalek"]
 hashing = ["blake3", "digest", "hkdf", "hmac", "generic-array"]
 symmetric = ["aes", "ctr", "cipher", "generic-array"]

common/crypto/dkg/Cargo.toml

@@ -0,0 +1,41 @@
+[package]
+name = "dkg"
+version = "0.1.0"
+edition = "2021"
+resolver = "2"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+bitvec = "1.0.0"
+
+# unfortunately until https://github.com/zkcrypto/bls12_381/issues/10 is resolved, we have to rely on the fork
+# as we need to be able to serialize Gt so that we could create the lookup table for baby-step-giant-step algorithm
+bls12_381 = { git = "https://github.com/jstuczyn/bls12_381", branch ="gt-serialisation", default-features = false, features = ["alloc", "pairings", "experimental", "zeroize"] }
+
+bs58 = "0.4"
+
+lazy_static = "1.4.0"
+rand = { version = "0.8.5", default-features = false}
+rand_chacha = "0.3"
+rand_core = "0.6.3"
+sha2 = "0.9"
+serde = "1.0"
+serde_derive = "1.0"
+thiserror = "1.0"
+zeroize = { version = "1.4", features = ["zeroize_derive"] }
+
+[dependencies.group]
+version = "0.11"
+default-features = false
+
+[dependencies.ff]
+version = "0.11"
+default-features = false
+
+[dev-dependencies]
+criterion = "0.3"
+
+[[bench]]
+name = "benchmarks"
+harness = false

common/crypto/dkg/benches/benchmarks.rs

@@ -0,0 +1,547 @@
+// Copyright 2022 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use bls12_381::{G1Projective, G2Affine, G2Prepared, Scalar};
+use criterion::{black_box, criterion_group, criterion_main, Criterion};
+use dkg::bte::encryption::BabyStepGiantStepLookup;
+use dkg::bte::proof_chunking::ProofOfChunking;
+use dkg::bte::proof_discrete_log::ProofOfDiscreteLog;
+use dkg::bte::proof_sharing::ProofOfSecretSharing;
+use dkg::bte::{
+    decrypt_share, encrypt_shares, keygen, proof_chunking, proof_sharing, setup, DecryptionKey,
+    Epoch, PublicKey,
+};
+use dkg::interpolation::polynomial::Polynomial;
+use dkg::{Dealing, NodeIndex, Share};
+use ff::Field;
+use rand_core::{RngCore, SeedableRng};
+use std::collections::BTreeMap;
+
+pub fn precompute_default_bsgs_table(c: &mut Criterion) {
+    c.bench_function("bsgs default table", |b| {
+        b.iter(|| black_box(BabyStepGiantStepLookup::default()))
+    });
+}
+
+pub fn precomputing_g2_generator_for_miller_loop(c: &mut Criterion) {
+    let g2 = G2Affine::generator();
+    c.bench_function("precomputing G2Prepared", |b| {
+        b.iter(|| black_box(G2Prepared::from(g2)))
+    });
+}
+
+fn prepare_keys(
+    mut rng: impl RngCore,
+    nodes: usize,
+) -> (BTreeMap<NodeIndex, PublicKey>, Vec<DecryptionKey>) {
+    let params = setup();
+    let mut node_indices = (0..nodes).map(|_| rng.next_u64()).collect::<Vec<_>>();
+    node_indices.sort_unstable();
+
+    let mut receivers = BTreeMap::new();
+    let mut dks = Vec::new();
+    for index in &node_indices {
+        let (dk, pk) = keygen(&params, &mut rng);
+        receivers.insert(*index, *pk.public_key());
+        dks.push(dk)
+    }
+
+    (receivers, dks)
+}
+
+pub fn creating_dealing_for_3_parties(c: &mut Criterion) {
+    let dummy_seed = [42u8; 32];
+    let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+    let params = setup();
+    let threshold = 2;
+    let epoch = Epoch::new(2);
+
+    let (receivers, _) = prepare_keys(&mut rng, 3);
+
+    c.bench_function("creating single dealing for 3 parties (threshold 2)", |b| {
+        b.iter(|| {
+            black_box({
+                Dealing::create(
+                    &mut rng,
+                    &params,
+                    receivers.keys().next().copied().unwrap(),
+                    threshold,
+                    epoch,
+                    &receivers,
+                    None,
+                )
+            })
+        })
+    });
+}
+
+pub fn verifying_dealing_made_for_3_parties_and_recovering_share(c: &mut Criterion) {
+    let dummy_seed = [42u8; 32];
+    let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+    let params = setup();
+    let threshold = 2;
+    let epoch = Epoch::new(2);
+
+    let (receivers, mut dks) = prepare_keys(&mut rng, 3);
+    let (dealing, _) = Dealing::create(
+        &mut rng,
+        &params,
+        receivers.keys().next().copied().unwrap(),
+        threshold,
+        epoch,
+        &receivers,
+        None,
+    );
+
+    let first_key = dks.get_mut(0).unwrap();
+    first_key.try_update_to(epoch, &params, &mut rng).unwrap();
+
+    c.bench_function(
+        "verifying single dealing made for 3 parties (threshold 2) and recovering share",
+        |b| {
+            b.iter(|| {
+                assert!(dealing
+                    .verify(&params, epoch, threshold, &receivers, None)
+                    .is_ok());
+                black_box(decrypt_share(first_key, 0, &dealing.ciphertexts, epoch, None).unwrap());
+            })
+        },
+    );
+}
+
+pub fn creating_dealing_for_20_parties(c: &mut Criterion) {
+    let dummy_seed = [42u8; 32];
+    let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+    let params = setup();
+    let threshold = 14;
+    let epoch = Epoch::new(2);
+
+    let (receivers, _) = prepare_keys(&mut rng, 20);
+
+    c.bench_function(
+        "creating single dealing for 20 parties (threshold 14)",
+        |b| {
+            b.iter(|| {
+                black_box({
+                    Dealing::create(
+                        &mut rng,
+                        &params,
+                        receivers.keys().next().copied().unwrap(),
+                        threshold,
+                        epoch,
+                        &receivers,
+                        None,
+                    )
+                })
+            })
+        },
+    );
+}
+
+pub fn verifying_dealing_made_for_20_parties_and_recovering_share(c: &mut Criterion) {
+    let dummy_seed = [42u8; 32];
+    let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+    let params = setup();
+    let threshold = 14;
+    let epoch = Epoch::new(2);
+
+    let (receivers, mut dks) = prepare_keys(&mut rng, 20);
+    let (dealing, _) = Dealing::create(
+        &mut rng,
+        &params,
+        receivers.keys().next().copied().unwrap(),
+        threshold,
+        epoch,
+        &receivers,
+        None,
+    );
+
+    let first_key = dks.get_mut(0).unwrap();
+    first_key.try_update_to(epoch, &params, &mut rng).unwrap();
+
+    c.bench_function(
+        "verifying single dealing made for 20 parties (threshold 14) and recovering share",
+        |b| {
+            b.iter(|| {
+                assert!(dealing
+                    .verify(&params, epoch, threshold, &receivers, None)
+                    .is_ok());
+                black_box(decrypt_share(first_key, 0, &dealing.ciphertexts, epoch, None).unwrap());
+            })
+        },
+    );
+}
+
+pub fn creating_dealing_for_100_parties(c: &mut Criterion) {
+    let dummy_seed = [42u8; 32];
+    let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+    let params = setup();
+    let threshold = 67;
+    let epoch = Epoch::new(2);
+
+    let (receivers, _) = prepare_keys(&mut rng, 100);
+
+    c.bench_function(
+        "creating single dealing for 100 parties (threshold 67)",
+        |b| {
+            b.iter(|| {
+                black_box({
+                    Dealing::create(
+                        &mut rng,
+                        &params,
+                        receivers.keys().next().copied().unwrap(),
+                        threshold,
+                        epoch,
+                        &receivers,
+                        None,
+                    )
+                })
+            })
+        },
+    );
+}
+
+pub fn verifying_dealing_made_for_100_parties_and_recovering_share(c: &mut Criterion) {
+    let dummy_seed = [42u8; 32];
+    let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+    let params = setup();
+    let threshold = 67;
+    let epoch = Epoch::new(2);
+
+    let (receivers, mut dks) = prepare_keys(&mut rng, 100);
+    let (dealing, _) = Dealing::create(
+        &mut rng,
+        &params,
+        receivers.keys().next().copied().unwrap(),
+        threshold,
+        epoch,
+        &receivers,
+        None,
+    );
+
+    let first_key = dks.get_mut(0).unwrap();
+    first_key.try_update_to(epoch, &params, &mut rng).unwrap();
+
+    c.bench_function(
+        "verifying single dealing made for 100 parties (threshold 67) and recovering share",
+        |b| {
+            b.iter(|| {
+                assert!(dealing
+                    .verify(&params, epoch, threshold, &receivers, None)
+                    .is_ok());
+                black_box(decrypt_share(first_key, 0, &dealing.ciphertexts, epoch, None).unwrap());
+            })
+        },
+    );
+}
+
+pub fn creating_proof_of_key_possession(c: &mut Criterion) {
+    let dummy_seed = [42u8; 32];
+    let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+
+    let g1 = G1Projective::generator();
+    let x = Scalar::random(&mut rng);
+    let y = g1 * x;
+
+    c.bench_function("creating proof of key possession", |b| {
+        b.iter(|| black_box(ProofOfDiscreteLog::construct(&mut rng, &y, &x)))
+    });
+}
+
+pub fn verifying_proof_of_key_possession(c: &mut Criterion) {
+    let dummy_seed = [42u8; 32];
+    let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+
+    let g1 = G1Projective::generator();
+    let x = Scalar::random(&mut rng);
+    let y = g1 * x;
+
+    let zk_proof = ProofOfDiscreteLog::construct(&mut rng, &y, &x);
+    c.bench_function("verifying proof of key possession", |b| {
+        b.iter(|| black_box(zk_proof.verify(&y)))
+    });
+}
+
+pub fn creating_proof_of_chunking_for_100_parties(c: &mut Criterion) {
+    let dummy_seed = [42u8; 32];
+    let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+    let params = setup();
+    let epoch = Epoch::new(2);
+
+    let (receivers, _) = prepare_keys(&mut rng, 100);
+
+    let polynomial = Polynomial::new_random(&mut rng, 67);
+    let shares = receivers
+        .keys()
+        .map(|&node_index| polynomial.evaluate_at(&Scalar::from(node_index)).into())
+        .collect::<Vec<_>>();
+
+    let remote_share_key_pairs = shares
+        .iter()
+        .zip(receivers.values())
+        .map(|(share, key)| (share, key))
+        .collect::<Vec<_>>();
+    let ordered_public_keys = receivers.values().copied().collect::<Vec<_>>();
+
+    let (ciphertexts, hazmat) = encrypt_shares(&remote_share_key_pairs, epoch, &params, &mut rng);
+
+    c.bench_function("creating proof of chunking for 100 parties", |b| {
+        b.iter(|| {
+            let chunking_instance =
+                proof_chunking::Instance::new(&ordered_public_keys, &ciphertexts);
+            black_box(
+                ProofOfChunking::construct(&mut rng, chunking_instance, hazmat.r(), &shares)
+                    .expect("failed to construct proof of chunking"),
+            )
+        })
+    });
+}
+
+pub fn verifying_proof_of_chunking_for_100_parties(c: &mut Criterion) {
+    let dummy_seed = [42u8; 32];
+    let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+    let params = setup();
+    let epoch = Epoch::new(2);
+
+    let (receivers, _) = prepare_keys(&mut rng, 100);
+
+    let polynomial = Polynomial::new_random(&mut rng, 67);
+    let shares = receivers
+        .keys()
+        .map(|&node_index| polynomial.evaluate_at(&Scalar::from(node_index)).into())
+        .collect::<Vec<_>>();
+
+    let remote_share_key_pairs = shares
+        .iter()
+        .zip(receivers.values())
+        .map(|(share, key)| (share, key))
+        .collect::<Vec<_>>();
+    let ordered_public_keys = receivers.values().copied().collect::<Vec<_>>();
+
+    let (ciphertexts, hazmat) = encrypt_shares(&remote_share_key_pairs, epoch, &params, &mut rng);
+
+    let chunking_instance = proof_chunking::Instance::new(&ordered_public_keys, &ciphertexts);
+    let proof_of_chunking =
+        ProofOfChunking::construct(&mut rng, chunking_instance, hazmat.r(), &shares)
+            .expect("failed to construct proof of chunking");
+
+    c.bench_function("verifying proof of chunking for 100 parties", |b| {
+        b.iter(|| {
+            let chunking_instance =
+                proof_chunking::Instance::new(&ordered_public_keys, &ciphertexts);
+            black_box(proof_of_chunking.verify(chunking_instance))
+        })
+    });
+}
+
+pub fn creating_proof_of_secret_sharing_for_100_parties(c: &mut Criterion) {
+    let dummy_seed = [42u8; 32];
+    let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+    let params = setup();
+    let epoch = Epoch::new(2);
+
+    let (receivers, _) = prepare_keys(&mut rng, 100);
+
+    let polynomial = Polynomial::new_random(&mut rng, 67);
+    let shares = receivers
+        .keys()
+        .map(|&node_index| polynomial.evaluate_at(&Scalar::from(node_index)).into())
+        .collect::<Vec<_>>();
+
+    let remote_share_key_pairs = shares
+        .iter()
+        .zip(receivers.values())
+        .map(|(share, key)| (share, key))
+        .collect::<Vec<_>>();
+
+    let (ciphertexts, hazmat) = encrypt_shares(&remote_share_key_pairs, epoch, &params, &mut rng);
+
+    let combined_ciphertexts = ciphertexts.combine_ciphertexts();
+    let combined_r = hazmat.combine_rs();
+    let combined_rr = ciphertexts.combine_rs();
+    let public_coefficients = polynomial.public_coefficients();
+
+    c.bench_function("creating proof of secret sharing for 100 parties", |b| {
+        b.iter(|| {
+            let sharing_instance = proof_sharing::Instance::new(
+                &receivers,
+                &public_coefficients,
+                &combined_rr,
+                &combined_ciphertexts,
+            );
+            black_box(
+                ProofOfSecretSharing::construct(&mut rng, sharing_instance, &combined_r, &shares)
+                    .expect("failed to construct proof of secret sharing"),
+            )
+        })
+    });
+}
+
+pub fn verifying_proof_of_secret_sharing_for_100_parties(c: &mut Criterion) {
+    let dummy_seed = [42u8; 32];
+    let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+    let params = setup();
+    let epoch = Epoch::new(2);
+
+    let (receivers, _) = prepare_keys(&mut rng, 100);
+
+    let polynomial = Polynomial::new_random(&mut rng, 67);
+    let shares = receivers
+        .keys()
+        .map(|&node_index| polynomial.evaluate_at(&Scalar::from(node_index)).into())
+        .collect::<Vec<_>>();
+
+    let remote_share_key_pairs = shares
+        .iter()
+        .zip(receivers.values())
+        .map(|(share, key)| (share, key))
+        .collect::<Vec<_>>();
+
+    let (ciphertexts, hazmat) = encrypt_shares(&remote_share_key_pairs, epoch, &params, &mut rng);
+
+    let combined_ciphertexts = ciphertexts.combine_ciphertexts();
+    let combined_r = hazmat.combine_rs();
+    let combined_rr = ciphertexts.combine_rs();
+    let public_coefficients = polynomial.public_coefficients();
+    let sharing_instance = proof_sharing::Instance::new(
+        &receivers,
+        &public_coefficients,
+        &combined_rr,
+        &combined_ciphertexts,
+    );
+    let proof_of_secret_sharing =
+        ProofOfSecretSharing::construct(&mut rng, sharing_instance, &combined_r, &shares)
+            .expect("failed to construct proof of secret sharing");
+
+    c.bench_function("verifying proof of secret sharing for 100 parties", |b| {
+        b.iter(|| {
+            let sharing_instance = proof_sharing::Instance::new(
+                &receivers,
+                &public_coefficients,
+                &combined_rr,
+                &combined_ciphertexts,
+            );
+            black_box(proof_of_secret_sharing.verify(sharing_instance))
+        })
+    });
+}
+
+pub fn single_share_encryption(c: &mut Criterion) {
+    let dummy_seed = [42u8; 32];
+    let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+    let params = setup();
+    let epoch = Epoch::new(2);
+    let (_, pk) = keygen(&params, &mut rng);
+
+    let polynomial = Polynomial::new_random(&mut rng, 3);
+    let share: Share = polynomial.evaluate_at(&Scalar::from(42)).into();
+
+    c.bench_function("single share encryption", |b| {
+        b.iter(|| {
+            black_box(encrypt_shares(
+                &[(&share, pk.public_key())],
+                epoch,
+                &params,
+                &mut rng,
+            ))
+        })
+    });
+}
+
+pub fn share_encryption_100(c: &mut Criterion) {
+    let dummy_seed = [42u8; 32];
+    let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+    let params = setup();
+    let epoch = Epoch::new(2);
+
+    let (receivers, _) = prepare_keys(&mut rng, 100);
+    let polynomial = Polynomial::new_random(&mut rng, 3);
+    let shares = receivers
+        .keys()
+        .map(|&node_index| polynomial.evaluate_at(&Scalar::from(node_index)).into())
+        .collect::<Vec<_>>();
+
+    let remote_share_key_pairs = shares
+        .iter()
+        .zip(receivers.values())
+        .map(|(share, key)| (share, key))
+        .collect::<Vec<_>>();
+
+    c.bench_function("100 shares encryption", |b| {
+        b.iter(|| {
+            black_box(encrypt_shares(
+                &remote_share_key_pairs,
+                epoch,
+                &params,
+                &mut rng,
+            ))
+        })
+    });
+}
+
+pub fn share_decryption(c: &mut Criterion) {
+    let dummy_seed = [42u8; 32];
+    let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+    let params = setup();
+    let epoch = Epoch::new(2);
+    let (mut dk, pk) = keygen(&params, &mut rng);
+
+    let polynomial = Polynomial::new_random(&mut rng, 3);
+    let share: Share = polynomial.evaluate_at(&Scalar::from(42)).into();
+    let (ciphertexts, _) = encrypt_shares(&[(&share, pk.public_key())], epoch, &params, &mut rng);
+    dk.try_update_to(epoch, &params, &mut rng).unwrap();
+
+    c.bench_function("single share decryption", |b| {
+        b.iter(|| black_box(decrypt_share(&dk, 0, &ciphertexts, epoch, None)))
+    });
+}
+
+criterion_group!(
+    utils,
+    precompute_default_bsgs_table,
+    precomputing_g2_generator_for_miller_loop,
+);
+
+criterion_group!(
+    dealings_creation,
+    creating_dealing_for_3_parties,
+    creating_dealing_for_20_parties,
+    creating_dealing_for_100_parties,
+);
+
+// note: in our setting each party will have to create at least 4 dealings (one per attribute in credential)
+// and verify 99 * 4 of them (4 from each other dealer)
+criterion_group!(
+    dealings_verification,
+    verifying_dealing_made_for_3_parties_and_recovering_share,
+    verifying_dealing_made_for_20_parties_and_recovering_share,
+    verifying_dealing_made_for_100_parties_and_recovering_share,
+);
+
+criterion_group!(
+    proofs_of_knowledge,
+    creating_proof_of_key_possession,
+    verifying_proof_of_key_possession,
+    creating_proof_of_chunking_for_100_parties,
+    verifying_proof_of_chunking_for_100_parties,
+    creating_proof_of_secret_sharing_for_100_parties,
+    verifying_proof_of_secret_sharing_for_100_parties
+);
+
+criterion_group!(
+    encryption,
+    single_share_encryption,
+    share_encryption_100,
+    share_decryption,
+);
+
+criterion_main!(
+    utils,
+    dealings_creation,
+    dealings_verification,
+    proofs_of_knowledge,
+    encryption
+);
+
+// TODO: benchmark using affine vs projective representation throughout the crate
+// (when conversion / serialization / computation is involved)

common/crypto/dkg/src/bte/encryption.rs

@@ -0,0 +1,772 @@
+// Copyright 2022 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use crate::bte::keys::{DecryptionKey, PublicKey};
+use crate::bte::{Epoch, Params, CHUNK_SIZE, G2_GENERATOR_PREPARED, NUM_CHUNKS, PAIRING_BASE};
+use crate::error::DkgError;
+use crate::utils::{combine_g1_chunks, combine_scalar_chunks, deserialize_g1, deserialize_g2};
+use crate::{Chunk, ChunkedShare, Share};
+use bls12_381::{G1Affine, G1Projective, G2Prepared, G2Projective, Gt, Scalar};
+use ff::Field;
+use group::{Curve, Group, GroupEncoding};
+use rand_core::RngCore;
+use std::collections::HashMap;
+use std::ops::Neg;
+use zeroize::Zeroize;
+
+#[derive(Debug)]
+#[cfg_attr(test, derive(Clone, PartialEq))]
+pub struct Ciphertexts {
+    pub rr: [G1Projective; NUM_CHUNKS],
+    pub ss: [G1Projective; NUM_CHUNKS],
+    pub zz: [G2Projective; NUM_CHUNKS],
+    pub ciphertext_chunks: Vec<[G1Projective; NUM_CHUNKS]>,
+}
+
+impl Ciphertexts {
+    pub fn verify_integrity(&self, params: &Params, epoch: Epoch) -> bool {
+        // if this checks fails it means the ciphertext is undefined as values
+        // in `r`, `s` and `z` are meaningless since technically this ciphertext
+        // has been created for 0 parties
+        if self.ciphertext_chunks.is_empty() {
+            return false;
+        }
+
+        let g1_neg = G1Affine::generator().neg();
+        let f = epoch
+            .as_extended_tau(&self.rr, &self.ss, &self.ciphertext_chunks)
+            .evaluate_f(params);
+
+        // we have to use `f` in up to `NUM_CHUNKS` pairings (if everything is valid),
+        // so perform some precomputation on it
+        let f_prepared = G2Prepared::from(f.to_affine());
+
+        // for each triple (R_i, S_i, Z_i) check whether e(g1, Z_i) == e(R_j, f) • e(S_i, h),
+        // which is equivalent to checking whether e(R_j, f) • e(S_i, h) • e(g1, Z_i)^-1 == id
+        // and due to bilinear property whether e(R_j, f) • e(S_i, h) • e(g1^-1, Z_i) == id
+        for i in 0..self.rr.len() {
+            let miller = bls12_381::multi_miller_loop(&[
+                (&self.rr[i].to_affine(), &f_prepared),
+                (&self.ss[i].to_affine(), &params._h_prepared),
+                (&g1_neg, &G2Prepared::from(self.zz[i].to_affine())),
+            ]);
+            let res = miller.final_exponentiation();
+            if !bool::from(res.is_identity()) {
+                return false;
+            }
+        }
+
+        true
+    }
+
+    pub fn combine_rs(&self) -> G1Projective {
+        combine_g1_chunks(&self.rr)
+    }
+
+    // required for the purposes of the proof of secret sharing
+    pub fn combine_ciphertexts(&self) -> Vec<G1Projective> {
+        self.ciphertext_chunks
+            .iter()
+            .map(|share_ciphertext| combine_g1_chunks(share_ciphertext))
+            .collect()
+    }
+
+    pub(crate) fn to_bytes(&self) -> Vec<u8> {
+        let num_receivers = self.ciphertext_chunks.len();
+
+        let mut bytes = Vec::with_capacity(NUM_CHUNKS * ((num_receivers + 2) * 48 + 96) + 4);
+        for r_i in &self.rr {
+            bytes.extend_from_slice(r_i.to_bytes().as_ref())
+        }
+        for s_i in &self.ss {
+            bytes.extend_from_slice(s_i.to_bytes().as_ref())
+        }
+        for z_i in &self.zz {
+            bytes.extend_from_slice(z_i.to_bytes().as_ref())
+        }
+
+        bytes.extend_from_slice(&(num_receivers as u32).to_be_bytes());
+        for c_i in &self.ciphertext_chunks {
+            for c_ij in c_i {
+                bytes.extend_from_slice(c_ij.to_bytes().as_ref())
+            }
+        }
+
+        bytes
+    }
+
+    pub(crate) fn try_from_bytes(bytes: &[u8]) -> Result<Self, DkgError> {
+        // at the very minimum we must have enough bytes for a single receiver
+        if bytes.len() < NUM_CHUNKS * (3 * 48 + 96) + 4 {
+            return Err(DkgError::new_deserialization_failure(
+                "Ciphertexts",
+                "insufficient number of bytes provided",
+            ));
+        }
+
+        let mut rr = Vec::with_capacity(NUM_CHUNKS);
+        let mut ss = Vec::with_capacity(NUM_CHUNKS);
+        let mut zz = Vec::with_capacity(NUM_CHUNKS);
+
+        let mut i = 0;
+        for _ in 0..NUM_CHUNKS {
+            rr.push(deserialize_g1(&bytes[i..i + 48]).ok_or_else(|| {
+                DkgError::new_deserialization_failure("Ciphertexts.r", "invalid curve point")
+            })?);
+            i += 48;
+        }
+        for _ in 0..NUM_CHUNKS {
+            ss.push(deserialize_g1(&bytes[i..i + 48]).ok_or_else(|| {
+                DkgError::new_deserialization_failure("Ciphertexts.s", "invalid curve point")
+            })?);
+            i += 48;
+        }
+        for _ in 0..NUM_CHUNKS {
+            zz.push(deserialize_g2(&bytes[i..i + 96]).ok_or_else(|| {
+                DkgError::new_deserialization_failure("Ciphertexts.z", "invalid curve point")
+            })?);
+            i += 96;
+        }
+
+        let num_receivers = u32::from_be_bytes(bytes[i..i + 4].try_into().unwrap()) as usize;
+        i += 4;
+
+        if bytes[i..].len() != num_receivers * NUM_CHUNKS * 48 {
+            return Err(DkgError::new_deserialization_failure(
+                "Ciphertexts",
+                "invalid number of bytes provided",
+            ));
+        }
+
+        let mut ciphertext_chunks = Vec::with_capacity(num_receivers);
+
+        for _ in 0..num_receivers {
+            let mut ci = Vec::with_capacity(NUM_CHUNKS);
+            for _ in 0..NUM_CHUNKS {
+                ci.push(deserialize_g1(&bytes[i..i + 48]).ok_or_else(|| {
+                    DkgError::new_deserialization_failure(
+                        "Ciphertexts.ciphertext_chunks",
+                        "invalid curve point",
+                    )
+                })?);
+                i += 48;
+            }
+
+            // this unwrap is fine as we have exactly NUM_CHUNKS elements in each vector
+            ciphertext_chunks.push(ci.try_into().unwrap())
+        }
+
+        // and the same is true here, the unwraps are fine as we have exactly NUM_CHUNKS elements in each as required
+        Ok(Ciphertexts {
+            rr: rr.try_into().unwrap(),
+            ss: ss.try_into().unwrap(),
+            zz: zz.try_into().unwrap(),
+            ciphertext_chunks,
+        })
+    }
+}
+
+#[derive(Zeroize)]
+#[zeroize(drop)]
+/// Randomness generated during ciphertext generation that is required for proofs of knowledge.
+/// It must be handled with extreme care as its misuse might help malicious parties to recover
+/// the underlying plaintext.
+pub struct HazmatRandomness {
+    r: [Scalar; NUM_CHUNKS],
+    s: [Scalar; NUM_CHUNKS],
+}
+
+impl HazmatRandomness {
+    pub fn r(&self) -> &[Scalar; NUM_CHUNKS] {
+        &self.r
+    }
+
+    pub fn s(&self) -> &[Scalar; NUM_CHUNKS] {
+        &self.s
+    }
+
+    pub fn combine_rs(&self) -> Scalar {
+        combine_scalar_chunks(&self.r)
+    }
+}
+
+pub fn encrypt_shares(
+    shares: &[(&Share, &PublicKey)],
+    epoch: Epoch,
+    params: &Params,
+    mut rng: impl RngCore,
+) -> (Ciphertexts, HazmatRandomness) {
+    let g1 = G1Projective::generator();
+
+    let mut rand_rs = Vec::with_capacity(NUM_CHUNKS);
+    let mut rand_ss = Vec::with_capacity(NUM_CHUNKS);
+    let mut rr = Vec::with_capacity(NUM_CHUNKS);
+    let mut ss = Vec::with_capacity(NUM_CHUNKS);
+
+    // generate relevant re-usable pseudorandom data
+    for _ in 0..NUM_CHUNKS {
+        let rand_r = Scalar::random(&mut rng);
+        let rand_s = Scalar::random(&mut rng);
+
+        // g1^r
+        let rr_i = g1 * rand_r;
+        // g1^s
+        let ss_i = g1 * rand_s;
+
+        rand_rs.push(rand_r);
+        rand_ss.push(rand_s);
+
+        rr.push(rr_i);
+        ss.push(ss_i);
+    }
+
+    // produce per-chunk ciphertexts
+    let mut cc = Vec::with_capacity(shares.len());
+
+    for (share, pk) in shares {
+        let m = share.to_chunks();
+
+        let mut ci = Vec::with_capacity(NUM_CHUNKS);
+
+        for (j, chunk) in m.chunks.iter().enumerate() {
+            // can't really have a more efficient implementation until https://github.com/zkcrypto/bls12_381/pull/70 is merged...
+            let c = pk.0 * rand_rs[j] + g1 * Scalar::from(*chunk as u64);
+            ci.push(c)
+        }
+
+        // the conversion must succeed since we must have EXACTLY `NUM_CHUNKS` elements
+        cc.push(ci.try_into().unwrap())
+    }
+
+    // convert into arrays, note that the unwraps are fine as we have exactly `NUM_CHUNKS` elements in each vector
+    let rr = rr.try_into().unwrap();
+    let ss = ss.try_into().unwrap();
+
+    let f = epoch.as_extended_tau(&rr, &ss, &cc).evaluate_f(params);
+
+    let mut zz = Vec::with_capacity(NUM_CHUNKS);
+    for i in 0..NUM_CHUNKS {
+        zz.push(f * rand_rs[i] + params.h * rand_ss[i]);
+    }
+
+    // the conversions here must also succeed since the other vecs also have `NUM_CHUNKS` elements
+    (
+        Ciphertexts {
+            rr,
+            ss,
+            zz: zz.try_into().unwrap(),
+            ciphertext_chunks: cc,
+        },
+        HazmatRandomness {
+            r: rand_rs.try_into().unwrap(),
+            s: rand_ss.try_into().unwrap(),
+        },
+    )
+}
+
+pub fn decrypt_share(
+    dk: &DecryptionKey,
+    // in the case of multiple receivers, specifies which index of ciphertext chunks should be used
+    i: usize,
+    ciphertext: &Ciphertexts,
+    epoch: Epoch,
+    lookup_table: Option<&BabyStepGiantStepLookup>,
+) -> Result<Share, DkgError> {
+    let mut plaintext = ChunkedShare::default();
+
+    let decryption_node = dk.try_get_compatible_node(epoch)?;
+    let extended_tau = epoch.as_extended_tau(
+        &ciphertext.rr,
+        &ciphertext.ss,
+        &ciphertext.ciphertext_chunks,
+    );
+
+    if i >= ciphertext.ciphertext_chunks.len() {
+        return Err(DkgError::UnavailableCiphertext(i));
+    }
+
+    let height = decryption_node.tau.height();
+    let b_neg = decryption_node
+        .ds
+        .iter()
+        .chain(decryption_node.dh.iter())
+        .zip(extended_tau.0.iter().by_vals().skip(height))
+        .filter(|(_, i)| *i)
+        .map(|(d_i, _)| d_i)
+        .fold(decryption_node.b, |acc, d_i| acc + d_i)
+        .neg()
+        .to_affine();
+
+    let e_neg = decryption_node.e.neg().to_affine();
+
+    for j in 0..NUM_CHUNKS {
+        let rr_j = &ciphertext.rr[j];
+        let ss_j = &ciphertext.ss[j];
+        let zz_j = ciphertext.zz[j].to_affine();
+        let cc_ij = &ciphertext.ciphertext_chunks[i][j];
+
+        let miller = bls12_381::multi_miller_loop(&[
+            (&cc_ij.to_affine(), &G2_GENERATOR_PREPARED),
+            (&rr_j.to_affine(), &G2Prepared::from(b_neg)),
+            (&decryption_node.a.to_affine(), &G2Prepared::from(zz_j)),
+            (&ss_j.to_affine(), &G2Prepared::from(e_neg)),
+        ]);
+        let m = miller.final_exponentiation();
+
+        plaintext.chunks[j] = baby_step_giant_step(&m, &PAIRING_BASE, lookup_table)?;
+    }
+
+    plaintext.try_into()
+}
+
+pub struct BabyStepGiantStepLookup {
+    base: Gt,
+    m: Chunk,
+    lookup: HashMap<[u8; 576], Chunk>,
+}
+
+impl BabyStepGiantStepLookup {
+    pub fn precompute(base: &Gt) -> Self {
+        let mut lookup = HashMap::new();
+        let mut g = Gt::identity();
+
+        // 1. m ← Ceiling(√n)
+        let m = (CHUNK_SIZE as f32).sqrt().ceil() as Chunk;
+
+        // 2. For all j where 0 ≤ j < m:
+        for j in 0..m {
+            // Compute α^j and store the pair (j, α^j) in a table.
+            lookup.insert(g.to_uncompressed(), j);
+            g += base;
+        }
+
+        BabyStepGiantStepLookup {
+            base: *base,
+            m,
+            lookup,
+        }
+    }
+
+    pub fn try_solve(&self, target: &Gt) -> Result<Chunk, DkgError> {
+        // 3. Compute α^{−m}
+        let m_neg = Scalar::from(self.m as u64).neg();
+        let alpha_m = self.base * m_neg;
+
+        // 4. γ ← β. (set γ = β)
+        let mut gamma = *target;
+
+        // 5. For all i where 0 ≤ i < m:
+        for i in 0..self.m {
+            // 1. Check to see if γ is the second component (αj) of any pair in the table.
+            if let Some(j) = self.lookup.get(&gamma.to_uncompressed()) {
+                // 2. If so, return im + j.
+                return Ok(i * self.m + j);
+            } else {
+                // 3. If not, γ ← γ • α^{−m}.
+                gamma += alpha_m;
+            }
+        }
+
+        Err(DkgError::UnsolvableDiscreteLog)
+    }
+}
+
+impl Default for BabyStepGiantStepLookup {
+    fn default() -> Self {
+        BabyStepGiantStepLookup::precompute(&PAIRING_BASE)
+    }
+}
+
+/// Attempts to solve the discrete log problem g^m, where g is in the Gt group and
+/// m should be within the [0, CHUNK_MAX] range.
+///
+/// The implementation follows the following algorithm: https://en.wikipedia.org/wiki/Baby-step_giant-step#The_algorithm
+///
+/// # Arguments
+///
+/// * `target`: the result of the exponentiation, M in M = g^m,
+/// * `base`: the base used for exponentiation, g in M = g^m
+/// * `lookup_table`: precomputed table containing (j, α^j) pairs
+pub fn baby_step_giant_step(
+    target: &Gt,
+    base: &Gt,
+    lookup_table: Option<&BabyStepGiantStepLookup>,
+) -> Result<Chunk, DkgError> {
+    if let Some(lookup_table) = lookup_table {
+        // compute expected m to make sure the provided lookup is valid
+        let m = (CHUNK_SIZE as f32).sqrt().ceil() as Chunk;
+
+        if &lookup_table.base != base || lookup_table.lookup.len() != m as usize {
+            return Err(DkgError::MismatchedLookupTable);
+        }
+
+        lookup_table.try_solve(target)
+    } else {
+        BabyStepGiantStepLookup::precompute(base).try_solve(target)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::bte::{keygen, setup, DEFAULT_BSGS_TABLE};
+    use rand_core::SeedableRng;
+
+    fn verify_hazmat_rand(ciphertext: &Ciphertexts, randomness: &HazmatRandomness) {
+        let g1 = G1Projective::generator();
+
+        for i in 0..ciphertext.rr.len() {
+            assert_eq!(ciphertext.rr[i], g1 * randomness.r[i]);
+            assert_eq!(ciphertext.ss[i], g1 * randomness.s[i]);
+        }
+    }
+
+    #[test]
+    fn baby_giant_100_without_table() {
+        let dummy_seed = [1u8; 32];
+        let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+
+        for i in 0u64..100 {
+            let base = Gt::random(&mut rng);
+            let x = (rng.next_u64() + i) % CHUNK_SIZE as u64;
+            let target = base * Scalar::from(x);
+
+            assert_eq!(
+                baby_step_giant_step(&target, &base, None).unwrap(),
+                x as Chunk
+            );
+        }
+    }
+
+    #[test]
+    fn baby_giant_100_with_table() {
+        let dummy_seed = [1u8; 32];
+        let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+        let base = Gt::random(&mut rng);
+        let lookup_table = BabyStepGiantStepLookup::precompute(&base);
+        let table = Some(&lookup_table);
+
+        for i in 0u64..100 {
+            let x = (rng.next_u64() + i) % CHUNK_SIZE as u64;
+            let target = base * Scalar::from(x);
+
+            assert_eq!(
+                baby_step_giant_step(&target, &base, table).unwrap(),
+                x as Chunk
+            );
+        }
+    }
+
+    #[test]
+    fn share_decryption_20() {
+        let dummy_seed = [1u8; 32];
+        let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+        let params = setup();
+
+        let (decryption_key1, public_key1) = keygen(&params, &mut rng);
+        let (decryption_key2, public_key2) = keygen(&params, &mut rng);
+        let epoch = Epoch::new(0);
+
+        let lookup_table = &DEFAULT_BSGS_TABLE;
+
+        for _ in 0..10 {
+            let m1 = Share::random(&mut rng);
+            let m2 = Share::random(&mut rng);
+            let shares = &[(&m1, &public_key1.key), (&m2, &public_key2.key)];
+
+            let (ciphertext, hazmat) = encrypt_shares(shares, epoch, &params, &mut rng);
+            verify_hazmat_rand(&ciphertext, &hazmat);
+
+            let recovered1 =
+                decrypt_share(&decryption_key1, 0, &ciphertext, epoch, Some(lookup_table)).unwrap();
+            let recovered2 =
+                decrypt_share(&decryption_key2, 1, &ciphertext, epoch, Some(lookup_table)).unwrap();
+            assert_eq!(m1, recovered1);
+            assert_eq!(m2, recovered2);
+        }
+    }
+
+    #[test]
+    fn share_encryption_under_nonzero_epoch() {
+        let dummy_seed = [1u8; 32];
+        let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+        let params = setup();
+
+        let (mut decryption_key1, public_key1) = keygen(&params, &mut rng);
+        let (mut decryption_key2, public_key2) = keygen(&params, &mut rng);
+        let epoch = Epoch::new(12345);
+        decryption_key1
+            .try_update_to(epoch, &params, &mut rng)
+            .unwrap();
+        decryption_key2
+            .try_update_to(epoch, &params, &mut rng)
+            .unwrap();
+
+        let lookup_table = &DEFAULT_BSGS_TABLE;
+
+        for _ in 0..10 {
+            let m1 = Share::random(&mut rng);
+            let m2 = Share::random(&mut rng);
+            let shares = &[(&m1, &public_key1.key), (&m2, &public_key2.key)];
+
+            let (ciphertext, hazmat) = encrypt_shares(shares, epoch, &params, &mut rng);
+            verify_hazmat_rand(&ciphertext, &hazmat);
+
+            let recovered1 =
+                decrypt_share(&decryption_key1, 0, &ciphertext, epoch, Some(lookup_table)).unwrap();
+            let recovered2 =
+                decrypt_share(&decryption_key2, 1, &ciphertext, epoch, Some(lookup_table)).unwrap();
+            assert_eq!(m1, recovered1);
+            assert_eq!(m2, recovered2);
+        }
+    }
+
+    #[test]
+    fn decryption_with_root_key() {
+        let dummy_seed = [42u8; 32];
+        let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+        let params = setup();
+
+        let (root_key, public_key) = keygen(&params, &mut rng);
+
+        let share = Share::random(&mut rng);
+
+        let epoch0 = Epoch::new(0);
+        let epoch42 = Epoch::new(42);
+        let epoch_big = Epoch::new(3292547435);
+
+        let (ciphertext1, hazmat1) =
+            encrypt_shares(&[(&share, &public_key.key)], epoch0, &params, &mut rng);
+        verify_hazmat_rand(&ciphertext1, &hazmat1);
+
+        let (ciphertext2, hazmat2) =
+            encrypt_shares(&[(&share, &public_key.key)], epoch42, &params, &mut rng);
+        verify_hazmat_rand(&ciphertext2, &hazmat2);
+
+        let (ciphertext3, hazmat3) =
+            encrypt_shares(&[(&share, &public_key.key)], epoch_big, &params, &mut rng);
+        verify_hazmat_rand(&ciphertext3, &hazmat3);
+
+        let recovered1 = decrypt_share(&root_key, 0, &ciphertext1, epoch0, None).unwrap();
+        let recovered2 = decrypt_share(&root_key, 0, &ciphertext2, epoch42, None).unwrap();
+        let recovered3 = decrypt_share(&root_key, 0, &ciphertext3, epoch_big, None).unwrap();
+
+        assert_eq!(share, recovered1);
+        assert_eq!(share, recovered2);
+        assert_eq!(share, recovered3);
+    }
+
+    #[test]
+    fn update_and_decrypt_10() {
+        let dummy_seed = [1u8; 32];
+        let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+        let params = setup();
+
+        let (mut decryption_key, public_key) = keygen(&params, &mut rng);
+
+        for epoch_value in 0..10 {
+            let epoch = Epoch::new(epoch_value);
+            let share = Share::random(&mut rng);
+            decryption_key
+                .try_update_to(epoch, &params, &mut rng)
+                .unwrap();
+
+            let (ciphertext, hazmat) =
+                encrypt_shares(&[(&share, &public_key.key)], epoch, &params, &mut rng);
+            verify_hazmat_rand(&ciphertext, &hazmat);
+
+            let recovered = decrypt_share(&decryption_key, 0, &ciphertext, epoch, None).unwrap();
+            assert_eq!(share, recovered);
+        }
+    }
+
+    #[test]
+    fn reblinding_node_doesnt_affect_decryption() {
+        let dummy_seed = [1u8; 32];
+        let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+        let params = setup();
+
+        let (mut decryption_key, public_key) = keygen(&params, &mut rng);
+
+        let epoch = Epoch::new(12345);
+        decryption_key
+            .try_update_to(epoch, &params, &mut rng)
+            .unwrap();
+        for node in decryption_key.nodes.iter_mut() {
+            node.reblind(&params, &mut rng);
+        }
+        let share = Share::random(&mut rng);
+
+        let (ciphertext, hazmat) =
+            encrypt_shares(&[(&share, &public_key.key)], epoch, &params, &mut rng);
+        verify_hazmat_rand(&ciphertext, &hazmat);
+
+        let recovered = decrypt_share(&decryption_key, 0, &ciphertext, epoch, None).unwrap();
+        assert_eq!(share, recovered);
+
+        // attempt to update the key again so we have to derive fresh nodes using previous reblinded results
+        let epoch2 = Epoch::new(67890);
+        decryption_key
+            .try_update_to(epoch2, &params, &mut rng)
+            .unwrap();
+        for node in decryption_key.nodes.iter_mut() {
+            node.reblind(&params, &mut rng);
+        }
+        let share2 = Share::random(&mut rng);
+
+        let (ciphertext, hazmat) =
+            encrypt_shares(&[(&share2, &public_key.key)], epoch2, &params, &mut rng);
+        verify_hazmat_rand(&ciphertext, &hazmat);
+
+        let recovered = decrypt_share(&decryption_key, 0, &ciphertext, epoch2, None).unwrap();
+        assert_eq!(share2, recovered);
+    }
+
+    #[test]
+    fn ciphertext_integrity_check_passes_for_valid_data() {
+        let params = setup();
+
+        let dummy_seed = [1u8; 32];
+        let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+
+        let (mut dk, public_key) = keygen(&params, &mut rng);
+        let epoch = Epoch::new(1);
+
+        dk.try_update_to(epoch, &params, &mut rng).unwrap();
+        let share = Share::random(&mut rng);
+        let (ciphertext, _) =
+            encrypt_shares(&[(&share, &public_key.key)], epoch, &params, &mut rng);
+        assert!(ciphertext.verify_integrity(&params, epoch))
+    }
+
+    #[test]
+    fn ciphertext_integrity_check_passes_fails_for_malformed_data() {
+        let params = setup();
+
+        let dummy_seed = [1u8; 32];
+        let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+
+        let (mut dk, public_key) = keygen(&params, &mut rng);
+        let epoch = Epoch::new(1);
+
+        dk.try_update_to(epoch, &params, &mut rng).unwrap();
+        let share = Share::random(&mut rng);
+        let (ciphertext, _) =
+            encrypt_shares(&[(&share, &public_key.key)], epoch, &params, &mut rng);
+
+        let mut bad_cipher1 = ciphertext.clone();
+        bad_cipher1.rr[4] = G1Projective::generator();
+        assert!(!bad_cipher1.verify_integrity(&params, epoch));
+
+        let mut bad_cipher2 = ciphertext.clone();
+        bad_cipher2.ss[4] = G1Projective::generator();
+        assert!(!bad_cipher2.verify_integrity(&params, epoch));
+
+        let mut bad_cipher3 = ciphertext;
+        bad_cipher3.zz[4] = G2Projective::generator();
+        assert!(!bad_cipher3.verify_integrity(&params, epoch));
+    }
+
+    #[test]
+    fn ciphertext_integrity_check_passes_fails_for_wrong_epoch() {
+        let params = setup();
+
+        let dummy_seed = [1u8; 32];
+        let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+
+        let (mut dk, public_key) = keygen(&params, &mut rng);
+        let epoch = Epoch::new(1);
+
+        dk.try_update_to(epoch, &params, &mut rng).unwrap();
+        let share = Share::random(&mut rng);
+        let (ciphertext, _) =
+            encrypt_shares(&[(&share, &public_key.key)], epoch, &params, &mut rng);
+
+        let another_epoch = Epoch::new(2);
+        assert!(!ciphertext.verify_integrity(&params, another_epoch))
+    }
+
+    #[test]
+    fn ciphertext_combining() {
+        let params = setup();
+
+        let dummy_seed = [1u8; 32];
+        let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+
+        let nodes = 3;
+
+        let mut shares = Vec::new();
+        let mut public_keys = Vec::new();
+        for _ in 0..nodes {
+            shares.push(Share::random(&mut rng));
+            let (_, pk) = keygen(&params, &mut rng);
+            public_keys.push(*pk.public_key());
+        }
+
+        let refs = shares.iter().zip(public_keys.iter()).collect::<Vec<_>>();
+        let (ciphertext, hazmat) = encrypt_shares(&refs, Epoch::new(42), &params, &mut rng);
+
+        let combined_r = combine_scalar_chunks(hazmat.r());
+        let combined_rr = ciphertext.combine_rs();
+        let combined_ciphertexts = ciphertext.combine_ciphertexts();
+
+        let g1 = G1Projective::generator();
+        for i in 0..nodes {
+            let expected = public_keys[i].0 * combined_r + g1 * shares[i].0;
+            assert_eq!(expected, combined_ciphertexts[i]);
+            assert_eq!(combined_rr, g1 * combined_r);
+        }
+    }
+
+    #[test]
+    fn ciphertexts_roundtrip() {
+        fn random_ciphertexts(mut rng: impl RngCore, num_receivers: usize) -> Ciphertexts {
+            Ciphertexts {
+                rr: (0..NUM_CHUNKS)
+                    .map(|_| G1Projective::random(&mut rng))
+                    .collect::<Vec<_>>()
+                    .try_into()
+                    .unwrap(),
+                ss: (0..NUM_CHUNKS)
+                    .map(|_| G1Projective::random(&mut rng))
+                    .collect::<Vec<_>>()
+                    .try_into()
+                    .unwrap(),
+                zz: (0..NUM_CHUNKS)
+                    .map(|_| G2Projective::random(&mut rng))
+                    .collect::<Vec<_>>()
+                    .try_into()
+                    .unwrap(),
+                ciphertext_chunks: (0..num_receivers)
+                    .map(|_| {
+                        (0..NUM_CHUNKS)
+                            .map(|_| G1Projective::random(&mut rng))
+                            .collect::<Vec<_>>()
+                            .try_into()
+                            .unwrap()
+                    })
+                    .collect(),
+            }
+        }
+
+        let dummy_seed = [1u8; 32];
+        let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+
+        let good_ciphertexts = vec![
+            random_ciphertexts(&mut rng, 1),
+            random_ciphertexts(&mut rng, 2),
+            random_ciphertexts(&mut rng, 10),
+        ];
+
+        for ciphertexts in &good_ciphertexts {
+            let bytes = ciphertexts.to_bytes();
+            let recovered = Ciphertexts::try_from_bytes(&bytes).unwrap();
+            assert_eq!(ciphertexts, &recovered);
+        }
+
+        // ciphertext for 0 receivers is invalid by default
+        let ciphertexts = random_ciphertexts(&mut rng, 0);
+        let bytes = ciphertexts.to_bytes();
+        assert!(Ciphertexts::try_from_bytes(&bytes).is_err());
+    }
+}

common/crypto/dkg/src/bte/keys.rs

@@ -0,0 +1,875 @@
+// Copyright 2022 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use crate::bte::proof_discrete_log::ProofOfDiscreteLog;
+use crate::bte::{Epoch, Params, Tau};
+use crate::error::DkgError;
+use crate::utils::{deserialize_g1, deserialize_g2, deserialize_scalar};
+use bls12_381::{G1Projective, G2Projective, Scalar};
+use ff::Field;
+use group::GroupEncoding;
+use rand_core::RngCore;
+use zeroize::Zeroize;
+
+#[derive(Debug, Zeroize)]
+#[zeroize(drop)]
+#[cfg_attr(test, derive(Clone, PartialEq))]
+pub(crate) struct Node {
+    pub(crate) tau: Tau,
+
+    // g1^rho
+    pub(crate) a: G1Projective,
+
+    // g2^x
+    pub(crate) b: G2Projective,
+
+    // f_i^rho, up to lambda_t elements
+    pub(crate) ds: Vec<G2Projective>,
+
+    // fh_i^rho, always lambda_h elements
+    pub(crate) dh: Vec<G2Projective>,
+
+    // h^rho
+    pub(crate) e: G2Projective,
+}
+
+impl Node {
+    fn new_root(
+        a: G1Projective,
+        b: G2Projective,
+        ds: Vec<G2Projective>,
+        dh: Vec<G2Projective>,
+        e: G2Projective,
+    ) -> Self {
+        Node {
+            tau: Tau::new_root(),
+            a,
+            b,
+            ds,
+            dh,
+            e,
+        }
+    }
+
+    fn is_root(&self) -> bool {
+        self.tau.0.is_empty()
+    }
+
+    pub(crate) fn reblind(&mut self, params: &Params, mut rng: impl RngCore) {
+        let delta = Scalar::random(&mut rng);
+        self.a += G1Projective::generator() * delta;
+
+        // TODO: or do we have to do full tau evaluation here?
+        self.b += self.tau.evaluate_partial_f(params) * delta;
+        self.ds
+            .iter_mut()
+            .zip(params.fs.iter().skip(self.tau.height()))
+            .for_each(|(d_i, f_i)| *d_i += f_i * delta);
+        self.dh
+            .iter_mut()
+            .zip(params.fh.iter())
+            .for_each(|(d_i, f_i)| *d_i += f_i * delta);
+
+        self.e += params.h * delta;
+    }
+
+    // note: it's unsafe to use this method outside `try_update_to` as
+    // we have guaranteed there that `self` is parent of the target
+    // and that `self.tau != target_tau`
+    /// Given `self` with `Tau1` and `target_tau` with `Tau2`, such that `Tau1` prefixes `Tau2`,
+    /// i.e. `Tau2 == Tau1 || SUFFIX`, and `Tau2` is a leaf node, derive all required crypto material
+    /// for its construction.
+    fn derive_target_child_with_partials(
+        &self,
+        params: &Params,
+        target_tau: Tau,
+        partial_b: &G2Projective,
+        partial_f: &G2Projective,
+        mut rng: impl RngCore,
+    ) -> Self {
+        debug_assert!(self.tau.is_parent_of(&target_tau));
+        debug_assert_ne!(self.tau, target_tau);
+
+        let delta = Scalar::random(&mut rng);
+        let a = self.a + G1Projective::generator() * delta;
+        let b = partial_b + partial_f * delta;
+        let ds = self
+            .ds
+            .iter()
+            .zip(params.fs.iter())
+            .skip(target_tau.height())
+            .map(|(d_i, f_i)| d_i + f_i * delta)
+            .collect();
+        let dh = self
+            .dh
+            .iter()
+            .zip(params.fh.iter())
+            .map(|(dh_i, fh_i)| dh_i + fh_i * delta)
+            .collect();
+        let e = self.e + params.h * delta;
+
+        Node {
+            tau: target_tau,
+            a,
+            b,
+            ds,
+            dh,
+            e,
+        }
+    }
+
+    // note: it's unsafe to use this method outside `try_update_to` as
+    // we have guaranteed there that `self` is parent of the target
+    // and that `self.tau != target_tau`
+    /// Given `self` with `Tau1` and `most_direct_parent` with `Tau2`, such that `Tau1` prefixes `Tau2`,
+    /// i.e. `Tau2 == Tau1 || SUFFIX`, derive node with `Tau3 = Tau2 || 1`
+    fn derive_right_nonfinal_child_of_with_partials(
+        &self,
+        params: &Params,
+        most_direct_parent: Tau,
+        partial_b: &G2Projective,
+        partial_f: &G2Projective,
+        mut rng: impl RngCore,
+    ) -> Self {
+        let right_branch = most_direct_parent.right_child();
+
+        debug_assert!(self.tau.is_parent_of(&most_direct_parent));
+        debug_assert!(self.tau.is_parent_of(&right_branch));
+        debug_assert_ne!(self.tau, right_branch);
+
+        // n is height difference between self and the child
+        let n = right_branch.height() - self.tau.height();
+
+        // i is the index of the last bit we just added
+        let i = right_branch.height() - 1;
+
+        let delta = Scalar::random(&mut rng);
+        let a = self.a + G1Projective::generator() * delta;
+        let d0 = self.ds[n - 1];
+        let b = partial_b + d0 + (partial_f + params.fs[i]) * delta;
+        let ds = self
+            .ds
+            .iter()
+            .skip(n)
+            .zip(params.fs.iter().skip(right_branch.height()))
+            .map(|(d_i, f_i)| d_i + f_i * delta)
+            .collect();
+        let dh = self
+            .dh
+            .iter()
+            .zip(params.fh.iter())
+            .map(|(dh_i, fh_i)| dh_i + fh_i * delta)
+            .collect();
+
+        let e = self.e + params.h * delta;
+
+        Node {
+            tau: right_branch,
+            a,
+            b,
+            ds,
+            dh,
+            e,
+        }
+    }
+
+    // tau_bytes_len || tau || a || b || len_ds || ds || len_dh || dh || e
+    pub(crate) fn to_bytes(&self) -> Vec<u8> {
+        let g1_elements = 1;
+        let g2_elements = self.ds.len() + self.dh.len() + 2;
+
+        let tau_bytes = self.tau.to_bytes();
+
+        // the extra 12 comes from the triple u32 we use for encoding lengths of tau, ds and dh
+        let mut bytes =
+            Vec::with_capacity(tau_bytes.len() + g1_elements * 48 + g2_elements * 96 + 12);
+
+        bytes.extend_from_slice(&((tau_bytes.len() as u32).to_be_bytes()));
+        bytes.extend_from_slice(&tau_bytes);
+        bytes.extend_from_slice(self.a.to_bytes().as_ref());
+        bytes.extend_from_slice(self.b.to_bytes().as_ref());
+        bytes.extend_from_slice(&((self.ds.len() as u32).to_be_bytes()));
+        for d_i in &self.ds {
+            bytes.extend_from_slice(d_i.to_bytes().as_ref());
+        }
+        bytes.extend_from_slice(&((self.dh.len() as u32).to_be_bytes()));
+        for dh_i in &self.dh {
+            bytes.extend_from_slice(dh_i.to_bytes().as_ref());
+        }
+        bytes.extend_from_slice(self.e.to_bytes().as_ref());
+
+        bytes
+    }
+
+    pub fn try_from_bytes(bytes: &[u8]) -> Result<Self, DkgError> {
+        // at the very least we require bytes for:
+        // - tau_len ( 4 )
+        // - tau ( could be 0 for root node )
+        // - a ( 48 )
+        // - b ( 96 )
+        // - length indication of ds ( 4 )
+        // - length indication of dh ( 4 )
+        // - e ( 96 )
+        if bytes.len() < 4 + 48 + 96 + 4 + 4 + 96 {
+            return Err(DkgError::new_deserialization_failure(
+                "Node",
+                "insufficient number of bytes provided",
+            ));
+        }
+
+        let tau_len = u32::from_be_bytes((&bytes[..4]).try_into().unwrap()) as usize;
+        let mut i = 4;
+
+        let tau = Tau::try_from_bytes(&bytes[i..i + tau_len])?;
+        i += tau_len;
+
+        // perform another length check to account for bytes consumed by tau
+        if bytes[i..].len() < 48 + 96 + 4 + 4 + 96 {
+            return Err(DkgError::new_deserialization_failure(
+                "Node",
+                "insufficient number of bytes provided",
+            ));
+        }
+
+        let a = deserialize_g1(&bytes[i..i + 48]).ok_or_else(|| {
+            DkgError::new_deserialization_failure("Node.a", "invalid curve point")
+        })?;
+        i += 48;
+
+        let b = deserialize_g2(&bytes[i..i + 96]).ok_or_else(|| {
+            DkgError::new_deserialization_failure("Node.b", "invalid curve point")
+        })?;
+        i += 96;
+
+        let ds_len = u32::from_be_bytes((&bytes[i..i + 4]).try_into().unwrap()) as usize;
+        i += 4;
+
+        if bytes[i..].len() < ds_len * 96 + 4 {
+            return Err(DkgError::new_deserialization_failure(
+                "Node",
+                "insufficient number of bytes provided (ds)",
+            ));
+        }
+
+        let mut ds = Vec::with_capacity(ds_len);
+        for j in 0..ds_len {
+            let d_i = deserialize_g2(&bytes[i..i + 96]).ok_or_else(|| {
+                DkgError::new_deserialization_failure(
+                    format!("Node.ds_{}", j),
+                    "invalid curve point",
+                )
+            })?;
+
+            ds.push(d_i);
+            i += 96;
+        }
+
+        let dh_len = u32::from_be_bytes((&bytes[i..i + 4]).try_into().unwrap()) as usize;
+        i += 4;
+
+        if bytes[i..].len() != (dh_len + 1) * 96 {
+            return Err(DkgError::new_deserialization_failure(
+                "Node",
+                "insufficient number of bytes provided (dh)",
+            ));
+        }
+
+        let mut dh = Vec::with_capacity(dh_len);
+        for j in 0..dh_len {
+            let dh_i = deserialize_g2(&bytes[i..i + 96]).ok_or_else(|| {
+                DkgError::new_deserialization_failure(
+                    format!("Node.dh_{}", j),
+                    "invalid curve point",
+                )
+            })?;
+
+            dh.push(dh_i);
+            i += 96;
+        }
+
+        let e = deserialize_g2(&bytes[i..]).ok_or_else(|| {
+            DkgError::new_deserialization_failure("Node.h", "invalid curve point")
+        })?;
+
+        Ok(Node {
+            tau,
+            a,
+            b,
+            ds,
+            dh,
+            e,
+        })
+    }
+}
+
+// produces public key and a decryption key for the root of the tree
+pub fn keygen(params: &Params, mut rng: impl RngCore) -> (DecryptionKey, PublicKeyWithProof) {
+    let g1 = G1Projective::generator();
+    let g2 = G2Projective::generator();
+
+    let mut x = Scalar::random(&mut rng);
+    let y = g1 * x;
+
+    let proof = ProofOfDiscreteLog::construct(&mut rng, &y, &x);
+
+    let mut rho = Scalar::random(&mut rng);
+
+    let a = g1 * rho;
+    let b = g2 * x + params.f0 * rho;
+
+    let ds = params.fs.iter().map(|f_i| f_i * rho).collect();
+    let dh = params.fh.iter().map(|fh_i| fh_i * rho).collect();
+    let e = params.h * rho;
+
+    let dk = DecryptionKey::new_root(Node::new_root(a, b, ds, dh, e));
+
+    let public_key = PublicKey(y);
+    let key_with_proof = PublicKeyWithProof {
+        key: public_key,
+        proof,
+    };
+
+    x.zeroize();
+    rho.zeroize();
+
+    (dk, key_with_proof)
+}
+
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub struct PublicKey(pub(crate) G1Projective);
+
+impl PublicKey {
+    pub fn verify(&self, proof: &ProofOfDiscreteLog) -> bool {
+        proof.verify(&self.0)
+    }
+}
+
+#[derive(Debug)]
+#[cfg_attr(test, derive(PartialEq))]
+pub struct PublicKeyWithProof {
+    pub(crate) key: PublicKey,
+    pub(crate) proof: ProofOfDiscreteLog,
+}
+
+impl PublicKeyWithProof {
+    pub fn verify(&self) -> bool {
+        self.key.verify(&self.proof)
+    }
+
+    pub fn public_key(&self) -> &PublicKey {
+        &self.key
+    }
+
+    pub fn to_bytes(&self) -> Vec<u8> {
+        // we have 2 G1 elements and 1 Scalar
+        let mut bytes = Vec::with_capacity(2 * 48 + 32);
+        bytes.extend_from_slice(self.key.0.to_bytes().as_ref());
+        bytes.extend_from_slice(self.proof.rand_commitment.to_bytes().as_ref());
+        bytes.extend_from_slice(self.proof.response.to_bytes().as_ref());
+
+        bytes
+    }
+
+    pub fn try_from_bytes(bytes: &[u8]) -> Result<Self, DkgError> {
+        if bytes.len() != 2 * 48 + 32 {
+            return Err(DkgError::new_deserialization_failure(
+                "PublicKeyWithProof",
+                "provided bytes had invalid length",
+            ));
+        }
+
+        let y_bytes = &bytes[..48];
+        let commitment_bytes = &bytes[48..96];
+        let response_bytes = &bytes[96..];
+
+        let y = deserialize_g1(y_bytes).ok_or_else(|| {
+            DkgError::new_deserialization_failure("PublicKeyWithProof.key.0", "invalid curve point")
+        })?;
+
+        let rand_commitment = deserialize_g1(commitment_bytes).ok_or_else(|| {
+            DkgError::new_deserialization_failure(
+                "PublicKeyWithProof.proof.rand_commitment",
+                "invalid curve point",
+            )
+        })?;
+
+        let response = deserialize_scalar(response_bytes).ok_or_else(|| {
+            DkgError::new_deserialization_failure(
+                "PublicKeyWithProof.proof.response",
+                "invalid scalar",
+            )
+        })?;
+
+        Ok(PublicKeyWithProof {
+            key: PublicKey(y),
+            proof: ProofOfDiscreteLog {
+                rand_commitment,
+                response,
+            },
+        })
+    }
+}
+
+#[derive(Debug, Zeroize)]
+#[zeroize(drop)]
+#[cfg_attr(test, derive(PartialEq))]
+pub struct DecryptionKey {
+    // note that the nodes are ordered from "right" to "left"
+    pub(crate) nodes: Vec<Node>,
+}
+
+impl DecryptionKey {
+    fn new_root(root_node: Node) -> Self {
+        DecryptionKey {
+            nodes: vec![root_node],
+        }
+    }
+
+    fn current(&self) -> Result<&Node, DkgError> {
+        // we must have at least a single node, otherwise we have a malformed key
+        self.nodes.last().ok_or(DkgError::MalformedDecryptionKey)
+    }
+
+    pub fn current_epoch(&self, params: &Params) -> Result<Option<Epoch>, DkgError> {
+        let current_node = self.current()?;
+        if current_node.is_root() {
+            Ok(None)
+        } else {
+            Epoch::try_from_tau(&current_node.tau, params).map(Option::Some)
+        }
+    }
+
+    pub(crate) fn try_get_compatible_node(&self, epoch: Epoch) -> Result<&Node, DkgError> {
+        let tau = epoch.as_tau();
+        self.nodes
+            .iter()
+            .rev()
+            .find(|node| node.tau.is_parent_of(&tau))
+            .ok_or(DkgError::ExpiredKey)
+    }
+
+    pub fn try_update_to_next_epoch(
+        &mut self,
+        params: &Params,
+        mut rng: impl RngCore,
+    ) -> Result<(), DkgError> {
+        if self.nodes.is_empty() {
+            return Err(DkgError::MalformedDecryptionKey);
+        }
+
+        let mut target_epoch = Epoch::new(0);
+        if self.nodes.len() == 1 && self.nodes[0].is_root() {
+            return self.try_update_to(target_epoch, params, &mut rng);
+        }
+
+        // unwrap is fine as we have asserted self.nodes is not empty
+        self.nodes.pop().unwrap();
+
+        if let Some(tail) = self.nodes.last() {
+            target_epoch = tail.tau.lowest_valid_epoch_child(params)?;
+        } else {
+            // essentially our key consisted of only a single node and it wasn't a root,
+            // so either it was malformed or we somehow reached the final epoch and wanted to update
+            // beyond that. Either way, update to l + 1 is impossible
+            return Err(DkgError::MalformedDecryptionKey);
+        }
+
+        self.try_update_to(target_epoch, params, &mut rng)
+    }
+
+    /// Attempts to update `self` to the provided `epoch`. If the update is not possible,
+    /// because the target was in the past or the key is malformed, an error is returned.
+    ///
+    /// Note that this method mutates the key in place and if the original key was malformed,
+    /// there are no guarantees about its internal state post-call.
+    pub fn try_update_to(
+        &mut self,
+        target_epoch: Epoch,
+        params: &Params,
+        mut rng: impl RngCore,
+    ) -> Result<(), DkgError> {
+        if self.nodes.is_empty() {
+            // somehow we have an empty decryption key
+            return Err(DkgError::MalformedDecryptionKey);
+        }
+
+        // makes it easier to work with since we will be generating non-leaf nodes
+        let target_tau = target_epoch.as_tau();
+        let current_tau = &self.current()?.tau;
+
+        if current_tau == &target_tau {
+            // our key is already updated to the target
+            return Ok(());
+        }
+
+        if current_tau > &target_tau {
+            // we cannot derive keys for past epochs
+            return Err(DkgError::TargetEpochUpdateInThePast);
+        }
+
+        // drop the nodes that are no longer required and get the most direct parent for the target epoch available
+        let mut parent = loop {
+            // if pop() fails the key is malformed since we checked that the target_epoch > current_epoch,
+            // hence the update should have been possible
+            let tail = self.nodes.pop().ok_or(DkgError::MalformedDecryptionKey)?;
+            if tail.tau.is_parent_of(&target_tau) {
+                break tail;
+            }
+        };
+
+        // essentially the case of updating epoch n to n + 1, where n is even;
+        // in that case the last two nodes are [..., epoch_{n+1}, epoch_n]
+        // so we just have to reblind the n+1 node and we're done
+        if parent.tau == target_tau {
+            parent.reblind(params, &mut rng);
+            self.nodes.push(parent);
+            return Ok(());
+        }
+
+        // accumulators, note that the previous elements have already been included by the parent,
+        // i.e. for example for parent at height l <= n, b = g2^x * f0^rho * d1^{tau_1} * ... * dl^{tau_l}
+        // new_b_accumulator = b * d1^{tau_1} * d2^{tau_2} * ... * dn^{tau_n}
+        // new_f_accumulator = f0 * f1^{tau_1} * f2^{tau_2} * ... * fn^{tau_n} (up to lambda_t)
+        let mut new_b_accumulator = parent.b;
+        let mut new_f_accumulator = parent.tau.evaluate_partial_f(params);
+
+        let parent_height = parent.tau.height();
+
+        // path from the parent to the child
+        for (n, bit) in target_tau
+            .0
+            .iter()
+            .by_vals()
+            .skip(parent.tau.height())
+            .enumerate()
+        {
+            // ith bit of the [child] epoch
+            // note that n represents height difference between parent and the current bit
+            let i = n + parent_height;
+
+            // if the bit is NOT set, push the right '1' subtree (for future keys)
+            // so for example if given parent with some `PREFIX` tau and target_epoch being `PREFIX || 010`,
+            // in the first loop iteration we're going to look at bit `0` and
+            // derive child node `PREFIX || 1` so that in the future we could derive keys for all other epochs starting with `PREFIX || 1`
+            // in the next loop iteration we're going to look at bit `1` and simply update the accumulators,
+            // as we don't need to generate any "left" nodes as all of them would have constructed epochs that are already in the past
+            // finally, in the last iteration, we look at the bit `0` and derive node `PREFIX || 011`,
+            // i.e. the one that FOLLOWS the target node.
+            if !bit {
+                let direct_parent = target_tau.try_get_parent_at_height(i)?;
+
+                self.nodes
+                    .push(parent.derive_right_nonfinal_child_of_with_partials(
+                        params,
+                        direct_parent,
+                        &new_b_accumulator,
+                        &new_f_accumulator,
+                        &mut rng,
+                    ));
+            } else {
+                // only update the accumulators when the bit is set, as d^0 == identity, so there's
+                // no point in doing anything else;
+                // note that we don't have to generate any new nodes when going into the right branch
+                // of the tree as everything on the left would have been in the past, so we don't care about them
+                new_b_accumulator += parent.ds[n]; // add d0
+                new_f_accumulator += params.fs[i]; // f_i
+            }
+        }
+
+        self.nodes.push(parent.derive_target_child_with_partials(
+            params,
+            target_epoch.as_tau(),
+            &new_b_accumulator,
+            &new_f_accumulator,
+            &mut rng,
+        ));
+
+        Ok(())
+    }
+
+    pub fn to_bytes(&self) -> Vec<u8> {
+        let num_nodes = self.nodes.len() as u32;
+
+        // unfortunately we're not going to know the expected capacity
+        let mut bytes = Vec::new();
+        bytes.extend_from_slice(&num_nodes.to_be_bytes());
+
+        for node in &self.nodes {
+            let mut node_bytes = node.to_bytes();
+            bytes.extend_from_slice(&((node_bytes.len() as u32).to_be_bytes()));
+            bytes.append(&mut node_bytes)
+        }
+
+        bytes
+    }
+
+    pub fn try_from_bytes(b: &[u8]) -> Result<Self, DkgError> {
+        // we have to be able to read the length of nodes
+        if b.len() < 4 {
+            return Err(DkgError::new_deserialization_failure(
+                "DecryptionKey",
+                "insufficient number of bytes provided",
+            ));
+        }
+        let nodes_len = u32::from_be_bytes([b[0], b[1], b[2], b[3]]) as usize;
+        let mut nodes = Vec::with_capacity(nodes_len);
+
+        let mut i = 4;
+        for _ in 0..nodes_len {
+            // check if we can actually read the length...
+            if b[i..].len() < 4 {
+                return Err(DkgError::new_deserialization_failure(
+                    "DecryptionKey.Node",
+                    "insufficient number of bytes provided for BTE Node recovery",
+                ));
+            }
+
+            let node_bytes = u32::from_be_bytes([b[i], b[i + 1], b[i + 2], b[i + 3]]) as usize;
+            if b[i + 4..].len() < node_bytes {
+                return Err(DkgError::new_deserialization_failure(
+                    "DecryptionKey.Node",
+                    "insufficient number of bytes provided for BTE Node recovery",
+                ));
+            }
+            i += 4;
+
+            let node = Node::try_from_bytes(&b[i..i + node_bytes])?;
+            nodes.push(node);
+            i += node_bytes;
+        }
+
+        Ok(DecryptionKey { nodes })
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::bte::setup;
+    use bitvec::bitvec;
+    use bitvec::order::Msb0;
+    use rand_core::SeedableRng;
+
+    #[test]
+    fn basic_coverage_nodes() {
+        // it's some basic test I've been performing when writing the update function, but figured
+        // might as well put it into a unit test. note that it doesn't check the entire structure,
+        // but just the few last nodes of low height
+
+        let params = setup();
+
+        let dummy_seed = [1u8; 32];
+        let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+
+        let (mut dk, _) = keygen(&params, &mut rng);
+
+        let root_node_copy = dk.nodes.clone();
+
+        // this is a root node
+        assert_eq!(dk.nodes.len(), 1);
+        assert!(dk.nodes[0].is_root());
+
+        // we have to have a node for right branch on each height (1, 01, 001, ... etc)
+        // plus an additional one for the two left-most leaves (epochs "0" and "1")
+        dk.try_update_to(Epoch::new(0), &params, &mut rng).unwrap();
+        assert_eq!(dk.nodes.len(), 33);
+
+        let expected_last = Tau::new(0);
+        // (and yes, I had to look up those names in a thesaurus)
+        let expected_penultimate = Tau::new(1);
+        // note that this value is 31bit long
+        let expected_antepenultimate = Tau(bitvec![u32, Msb0;
+            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+            0, 1
+        ]);
+
+        let mut nodes_iter = dk.nodes.iter().rev();
+        assert_eq!(expected_last, nodes_iter.next().unwrap().tau);
+        assert_eq!(expected_penultimate, nodes_iter.next().unwrap().tau);
+        assert_eq!(expected_antepenultimate, nodes_iter.next().unwrap().tau);
+
+        let mut epoch_zero_nodes = dk.nodes.clone();
+
+        // nodes for epoch1 should be identical for those for epoch0 minus the 00..00 leaf
+        dk.try_update_to(Epoch::new(1), &params, &mut rng).unwrap();
+        assert_eq!(dk.nodes.len(), 32);
+        epoch_zero_nodes.pop().unwrap();
+        assert_eq!(
+            epoch_zero_nodes
+                .iter()
+                .map(|node| node.tau.clone())
+                .collect::<Vec<_>>(),
+            dk.nodes
+                .iter()
+                .map(|node| node.tau.clone())
+                .collect::<Vec<_>>()
+        );
+
+        dk.try_update_to(Epoch::new(2), &params, &mut rng).unwrap();
+        dk.try_update_to(Epoch::new(3), &params, &mut rng).unwrap();
+        dk.try_update_to(Epoch::new(4), &params, &mut rng).unwrap();
+
+        let expected_last = Tau::new(4);
+        let expected_penultimate = Tau::new(5);
+        let expected_antepenultimate = Tau(bitvec![u32, Msb0;
+            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1
+        ]);
+        let expected_preantepenultimate = Tau(bitvec![u32, Msb0;
+            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1
+        ]);
+        assert_eq!(dk.nodes.len(), 32);
+        let mut nodes_iter = dk.nodes.iter().rev();
+        assert_eq!(expected_last, nodes_iter.next().unwrap().tau);
+        assert_eq!(expected_penultimate, nodes_iter.next().unwrap().tau);
+        assert_eq!(expected_antepenultimate, nodes_iter.next().unwrap().tau);
+        assert_eq!(expected_preantepenultimate, nodes_iter.next().unwrap().tau);
+
+        // the result should be the same of regardless if we update incrementally or go to the target immediately
+        let mut new_root = DecryptionKey {
+            nodes: root_node_copy,
+        };
+        new_root
+            .try_update_to(Epoch::new(4), &params, &mut rng)
+            .unwrap();
+        assert_eq!(
+            dk.nodes
+                .iter()
+                .map(|node| node.tau.clone())
+                .collect::<Vec<_>>(),
+            new_root
+                .nodes
+                .iter()
+                .map(|node| node.tau.clone())
+                .collect::<Vec<_>>()
+        );
+
+        // getting expected nodes for those epochs is non-trivial for test purposes, but the last node
+        // should ALWAYS be equal to the target epoch
+        dk.try_update_to(Epoch::new(42), &params, &mut rng).unwrap();
+        assert_eq!(dk.nodes.last().unwrap().tau, Tau::new(42));
+        dk.try_update_to(Epoch::new(123456), &params, &mut rng)
+            .unwrap();
+        assert_eq!(dk.nodes.last().unwrap().tau, Tau::new(123456));
+        dk.try_update_to(Epoch::new(3292547435), &params, &mut rng)
+            .unwrap();
+        assert_eq!(dk.nodes.last().unwrap().tau, Tau::new(3292547435));
+
+        // trying to go to past epochs fails
+        assert!(dk
+            .try_update_to(Epoch::new(531), &params, &mut rng)
+            .is_err())
+    }
+
+    #[test]
+    fn updating_to_next_epoch() {
+        let params = setup();
+
+        let dummy_seed = [1u8; 32];
+        let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+
+        let (mut dk, _) = keygen(&params, &mut rng);
+
+        // for root node current epoch is `None`
+        assert_eq!(None, dk.current_epoch(&params).unwrap());
+
+        // for root node it should result in epoch 0
+        dk.try_update_to_next_epoch(&params, &mut rng).unwrap();
+        assert_eq!(Some(Epoch::new(0)), dk.current_epoch(&params).unwrap());
+
+        dk.try_update_to_next_epoch(&params, &mut rng).unwrap();
+        assert_eq!(Some(Epoch::new(1)), dk.current_epoch(&params).unwrap());
+
+        dk.try_update_to_next_epoch(&params, &mut rng).unwrap();
+        assert_eq!(Some(Epoch::new(2)), dk.current_epoch(&params).unwrap());
+
+        // if we start from some non-root epoch, it should result in l + 1
+        dk.try_update_to(Epoch::new(42), &params, &mut rng).unwrap();
+        dk.try_update_to_next_epoch(&params, &mut rng).unwrap();
+        assert_eq!(Some(Epoch::new(43)), dk.current_epoch(&params).unwrap());
+
+        dk.try_update_to(Epoch::new(12345), &params, &mut rng)
+            .unwrap();
+        dk.try_update_to_next_epoch(&params, &mut rng).unwrap();
+        assert_eq!(Some(Epoch::new(12346)), dk.current_epoch(&params).unwrap());
+
+        dk.try_update_to(Epoch::new(3292547435), &params, &mut rng)
+            .unwrap();
+        dk.try_update_to_next_epoch(&params, &mut rng).unwrap();
+        assert_eq!(
+            Some(Epoch::new(3292547436)),
+            dk.current_epoch(&params).unwrap()
+        );
+    }
+
+    #[test]
+    fn public_key_with_proof_roundtrip() {
+        let params = setup();
+
+        let dummy_seed = [1u8; 32];
+        let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+
+        let (_, pk) = keygen(&params, &mut rng);
+        let bytes = pk.to_bytes();
+        let recovered = PublicKeyWithProof::try_from_bytes(&bytes).unwrap();
+
+        assert_eq!(pk, recovered)
+    }
+
+    #[test]
+    fn bte_node_roundtrip() {
+        let params = setup();
+
+        let dummy_seed = [1u8; 32];
+        let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+
+        let (mut dk, _) = keygen(&params, &mut rng);
+
+        let root_node = dk.nodes[0].clone();
+        let bytes = root_node.to_bytes();
+        let recovered = Node::try_from_bytes(&bytes).unwrap();
+        assert_eq!(root_node, recovered);
+
+        dk.try_update_to(Epoch::new(3292547435), &params, &mut rng)
+            .unwrap();
+        for node in &dk.nodes {
+            let bytes = node.to_bytes();
+            let recovered = Node::try_from_bytes(&bytes).unwrap();
+            assert_eq!(node, &recovered);
+        }
+    }
+
+    #[test]
+    fn decryption_key_node_roundtrip() {
+        let params = setup();
+
+        let dummy_seed = [1u8; 32];
+        let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+
+        let (mut dk, _) = keygen(&params, &mut rng);
+
+        let bytes = dk.to_bytes();
+        let recovered = DecryptionKey::try_from_bytes(&bytes).unwrap();
+        assert_eq!(dk, recovered);
+
+        dk.try_update_to(Epoch::new(0), &params, &mut rng).unwrap();
+        let bytes = dk.to_bytes();
+        let recovered = DecryptionKey::try_from_bytes(&bytes).unwrap();
+        assert_eq!(dk, recovered);
+
+        dk.try_update_to(Epoch::new(1), &params, &mut rng).unwrap();
+        let bytes = dk.to_bytes();
+        let recovered = DecryptionKey::try_from_bytes(&bytes).unwrap();
+        assert_eq!(dk, recovered);
+
+        dk.try_update_to(Epoch::new(42), &params, &mut rng).unwrap();
+        let bytes = dk.to_bytes();
+        let recovered = DecryptionKey::try_from_bytes(&bytes).unwrap();
+        assert_eq!(dk, recovered);
+
+        dk.try_update_to(Epoch::new(3292547435), &params, &mut rng)
+            .unwrap();
+        let bytes = dk.to_bytes();
+        let recovered = DecryptionKey::try_from_bytes(&bytes).unwrap();
+        assert_eq!(dk, recovered);
+    }
+}

common/crypto/dkg/src/bte/mod.rs

@@ -0,0 +1,463 @@
+// Copyright 2022 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use crate::error::DkgError;
+use crate::utils::{hash_g2, RandomOracleBuilder};
+use crate::{Chunk, Share};
+use bitvec::field::BitField;
+use bitvec::order::Msb0;
+use bitvec::vec::BitVec;
+use bitvec::view::BitView;
+use bls12_381::{G1Affine, G1Projective, G2Affine, G2Prepared, G2Projective, Gt};
+use group::Curve;
+use lazy_static::lazy_static;
+use zeroize::Zeroize;
+
+pub mod encryption;
+pub mod keys;
+pub mod proof_chunking;
+pub mod proof_discrete_log;
+pub mod proof_sharing;
+
+pub use encryption::{decrypt_share, encrypt_shares, Ciphertexts};
+pub use keys::{keygen, DecryptionKey, PublicKey, PublicKeyWithProof};
+
+lazy_static! {
+    pub(crate) static ref PAIRING_BASE: Gt =
+        bls12_381::pairing(&G1Affine::generator(), &G2Affine::generator());
+    pub(crate) static ref G2_GENERATOR_PREPARED: G2Prepared =
+        G2Prepared::from(G2Affine::generator());
+    pub(crate) static ref DEFAULT_BSGS_TABLE: encryption::BabyStepGiantStepLookup =
+        encryption::BabyStepGiantStepLookup::default();
+}
+
+// Domain tries to follow guidelines specified by:
+// https://datatracker.ietf.org/doc/html/draft-irtf-cfrg-hash-to-curve-11#section-3.1
+const SETUP_DOMAIN: &[u8] = b"NYM_COCONUT_NIDKG_V01_CS01_WITH_BLS12381G2_XMD:SHA-256_SSWU_RO_SETUP";
+
+// this particular domain is not for curve hashing, but might as well also follow the same naming pattern
+const TREE_TAU_EXTENSION_DOMAIN: &[u8] = b"NYM_COCONUT_NIDKG_V01_CS01_SHA-256_TREE_EXTENSION";
+
+const MAX_EPOCHS_EXP: usize = 32;
+const HASH_SECURITY_PARAM: usize = 256;
+
+// note: CHUNK_BYTES * NUM_CHUNKS must equal to SCALAR_SIZE
+pub const CHUNK_BYTES: usize = 2;
+pub const NUM_CHUNKS: usize = 16;
+pub const SCALAR_SIZE: usize = 32;
+
+/// In paper B; number of distinct chunks
+pub const CHUNK_SIZE: usize = 1 << (CHUNK_BYTES << 3);
+
+pub(crate) type EpochStore = u32;
+
+#[derive(Clone, Debug, PartialEq, PartialOrd)]
+// None empty bitvec implies this is a root node
+pub(crate) struct Tau(BitVec<EpochStore, Msb0>);
+
+impl Tau {
+    pub fn new_root() -> Self {
+        Tau(BitVec::new())
+    }
+
+    // TODO: perhaps this should be explicitly moved to some test module
+    #[cfg(test)]
+    pub(crate) fn new(epoch: EpochStore) -> Self {
+        Tau(epoch.view_bits().to_bitvec())
+    }
+
+    #[allow(unused)]
+    pub fn left_child(&self) -> Self {
+        let mut child = self.0.clone();
+        child.push(false);
+        Tau(child)
+    }
+
+    pub fn right_child(&self) -> Self {
+        let mut child = self.0.clone();
+        child.push(true);
+        Tau(child)
+    }
+
+    pub fn is_leaf(&self, params: &Params) -> bool {
+        self.height() == params.lambda_t
+    }
+
+    pub fn try_get_parent_at_height(&self, height: usize) -> Result<Self, DkgError> {
+        if height > self.0.len() {
+            return Err(DkgError::NotAValidParent);
+        }
+
+        Ok(Tau(self.0[..height].to_bitvec()))
+    }
+
+    // essentially is this tau prefixing the other
+    pub fn is_parent_of(&self, other: &Tau) -> bool {
+        if self.0.len() > other.0.len() {
+            return false;
+        }
+
+        for (i, b) in self.0.iter().enumerate() {
+            if b != other.0[i] {
+                return false;
+            }
+        }
+
+        true
+    }
+
+    pub fn lowest_valid_epoch_child(&self, params: &Params) -> Result<Epoch, DkgError> {
+        if self.0.len() > params.lambda_t {
+            // this node is already BELOW a valid leaf-epoch node. it can only happen
+            // if either some invariant was broken or additional data was pushed to `tau`
+            // in order compute some intermediate results, but in that case this method should have
+            // never been called anyway. tl;dr: if this is called, the underlying key is malformed
+            return Err(DkgError::NotAValidParent);
+        }
+        let mut child = self.0.clone();
+        for _ in 0..(params.lambda_t - self.0.len()) {
+            child.push(false)
+        }
+
+        // the unwrap here is fine as we ensure we have exactly `params.tree_height` bits here
+        // (we could just propagate the error instead of unwraping and putting it behind an `Ok` anyway
+        // but I'd prefer to just blow up since this would be a serious error
+        Ok(Epoch::try_from_tau(&Tau(child), params).unwrap())
+    }
+
+    pub fn height(&self) -> usize {
+        self.0.len()
+    }
+
+    fn extend(
+        &self,
+        rr: &[G1Projective; NUM_CHUNKS],
+        ss: &[G1Projective; NUM_CHUNKS],
+        cc: &[[G1Projective; NUM_CHUNKS]],
+    ) -> Self {
+        let mut random_oracle_builder = RandomOracleBuilder::new(TREE_TAU_EXTENSION_DOMAIN);
+        random_oracle_builder.update_with_g1_elements(rr.iter());
+        random_oracle_builder.update_with_g1_elements(ss.iter());
+        for ciphertext_chunks in cc {
+            random_oracle_builder.update_with_g1_elements(ciphertext_chunks.iter());
+        }
+
+        let tau_mem = self.0.as_raw_slice();
+        assert_eq!(tau_mem.len(), 1, "tau length invariant was broken");
+        random_oracle_builder.update(&tau_mem[0].to_be_bytes());
+
+        let oracle_output = random_oracle_builder.finalize();
+        debug_assert_eq!(oracle_output.len() * 8, HASH_SECURITY_PARAM);
+
+        let mut extended_tau = self.clone();
+        for byte in oracle_output {
+            extended_tau
+                .0
+                .extend_from_bitslice(byte.view_bits::<Msb0>())
+        }
+
+        extended_tau
+    }
+
+    // considers all lambda_t + lambda_h bits
+    fn evaluate_f(&self, params: &Params) -> G2Projective {
+        self.0
+            .iter()
+            .by_vals()
+            .zip(params.fs.iter().chain(params.fh.iter()))
+            .filter(|(i, _)| *i)
+            .map(|(_, f_i)| f_i)
+            .fold(params.f0, |acc, f_i| acc + f_i)
+    }
+
+    // only considers up to lambda_t bits
+    fn evaluate_partial_f(&self, params: &Params) -> G2Projective {
+        self.0
+            .iter()
+            .by_vals()
+            .zip(params.fs.iter())
+            .filter(|(i, _)| *i)
+            .map(|(_, f_i)| f_i)
+            .fold(params.f0, |acc, f_i| acc + f_i)
+    }
+
+    pub(crate) fn to_bytes(&self) -> Vec<u8> {
+        let len_bytes = (self.0.len() as u32).to_be_bytes();
+        len_bytes
+            .into_iter()
+            .chain(self.0.chunks(8).map(BitField::load_be))
+            .collect()
+    }
+
+    pub(crate) fn try_from_bytes(b: &[u8]) -> Result<Self, DkgError> {
+        if b.len() < 4 {
+            return Err(DkgError::new_deserialization_failure(
+                "Tau",
+                "insufficient number of bytes provided",
+            ));
+        }
+        let tau_len = u32::from_be_bytes([b[0], b[1], b[2], b[3]]) as usize;
+
+        // maximum theoretical length
+        if tau_len > MAX_EPOCHS_EXP + HASH_SECURITY_PARAM {
+            return Err(DkgError::new_deserialization_failure(
+                "Tau",
+                format!(
+                    "malformed length {} is greater than maximum {}",
+                    tau_len,
+                    MAX_EPOCHS_EXP + HASH_SECURITY_PARAM
+                ),
+            ));
+        }
+
+        if tau_len == 0 {
+            if b.len() != 4 {
+                Err(DkgError::new_deserialization_failure(
+                    "Tau",
+                    "malformed bytes",
+                ))
+            } else {
+                Ok(Tau::new_root())
+            }
+        } else if b.len() == 4 {
+            Err(DkgError::new_deserialization_failure(
+                "Tau",
+                "insufficient number of bytes provided",
+            ))
+        } else {
+            let mut inner = BitVec::repeat(false, tau_len);
+            for (slot, &byte) in inner.chunks_mut(8).zip(b[4..].iter()) {
+                slot.store_be(byte);
+            }
+
+            Ok(Tau(inner))
+        }
+    }
+}
+
+impl Zeroize for Tau {
+    fn zeroize(&mut self) {
+        for v in self.0.as_raw_mut_slice() {
+            v.zeroize()
+        }
+    }
+}
+
+#[derive(Copy, Clone, Debug, PartialEq, PartialOrd)]
+pub struct Epoch(EpochStore);
+
+impl Epoch {
+    pub fn new(value: EpochStore) -> Self {
+        Epoch(value)
+    }
+
+    pub(crate) fn as_tau(&self) -> Tau {
+        (*self).into()
+    }
+
+    pub(crate) fn as_extended_tau(
+        &self,
+        rr: &[G1Projective; NUM_CHUNKS],
+        ss: &[G1Projective; NUM_CHUNKS],
+        cc: &[[G1Projective; NUM_CHUNKS]],
+    ) -> Tau {
+        self.as_tau().extend(rr, ss, cc)
+    }
+
+    pub(crate) fn try_from_tau(tau: &Tau, params: &Params) -> Result<Self, DkgError> {
+        if !tau.is_leaf(params) {
+            Err(DkgError::MalformedEpoch)
+        } else {
+            Ok(Epoch(tau.0.load_be()))
+        }
+    }
+}
+
+impl From<Epoch> for Tau {
+    fn from(epoch: Epoch) -> Self {
+        Tau(epoch.0.view_bits().to_bitvec())
+    }
+}
+
+impl From<EpochStore> for Epoch {
+    fn from(epoch: EpochStore) -> Self {
+        Epoch(epoch)
+    }
+}
+
+pub struct Params {
+    /// Maximum size of an epoch, in bits.
+    pub lambda_t: usize,
+
+    /// Security parameter of our $H_{\Lamda_H}$ hash function
+    pub lambda_h: usize,
+
+    // keeping f0 separate from the rest of the curve points makes it easier to work with tau
+    f0: G2Projective,
+    fs: Vec<G2Projective>, // f_1, f_2, .... f_{lambda_t} in the paper
+    fh: Vec<G2Projective>, // f_{lambda_t+1}, f_{lambda_t+1}, .... f_{lambda_t+lambda_h} in the paper
+    h: G2Projective,
+
+    /// Precomputed `h` used for the miller loop
+    _h_prepared: G2Prepared,
+}
+
+pub fn setup() -> Params {
+    let f0 = hash_g2(b"f0", SETUP_DOMAIN);
+
+    let fs = (1..=MAX_EPOCHS_EXP)
+        .map(|i| hash_g2(format!("f{}", i), SETUP_DOMAIN))
+        .collect();
+
+    let fh = (0..HASH_SECURITY_PARAM)
+        .map(|i| hash_g2(format!("fh{}", i), SETUP_DOMAIN))
+        .collect();
+
+    let h = hash_g2(b"h", SETUP_DOMAIN);
+
+    Params {
+        lambda_t: MAX_EPOCHS_EXP,
+        lambda_h: HASH_SECURITY_PARAM,
+        f0,
+        fs,
+        fh,
+        h,
+        _h_prepared: G2Prepared::from(h.to_affine()),
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use bitvec::bitvec;
+    use bitvec::order::Msb0;
+
+    #[test]
+    fn creating_tau_from_epoch() {
+        assert!(Tau::new_root().0.is_empty());
+
+        let zero = Tau::new(0);
+        assert!(zero.0.iter().by_vals().all(|b| !b));
+
+        let one = Tau::new(1);
+        let mut iter = one.0.iter().by_vals();
+        // first 31 bits are 0, the last one is 1
+        for _ in 0..31 {
+            assert!(!iter.next().unwrap())
+        }
+        assert!(iter.next().unwrap());
+
+        // 101010 in binary
+        let forty_two = Tau::new(42);
+        // first 26 bits are not set
+        let mut iter = forty_two.0.iter().by_vals();
+        for _ in 0..26 {
+            assert!(!iter.next().unwrap())
+        }
+        assert!(iter.next().unwrap());
+        assert!(!iter.next().unwrap());
+        assert!(iter.next().unwrap());
+        assert!(!iter.next().unwrap());
+        assert!(iter.next().unwrap());
+        assert!(!iter.next().unwrap());
+
+        // value that requires an actual u32 (i.e. takes 4 bytes to represent)
+        // 11000100_01000000_01001001_01101011 in binary
+        let big_val = Tau::new(3292547435);
+        let expected = bitvec![u32, Msb0;
+            1, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1,
+            0, 1, 1
+        ];
+        assert_eq!(expected, big_val.0)
+    }
+
+    #[test]
+    fn getting_parent_at_height() {
+        let tau = Tau(bitvec![u32, Msb0; 1,0,1,1,0,0,1]);
+
+        let expected_0 = Tau(BitVec::new());
+        let expected_1 = Tau(bitvec![u32, Msb0; 1]);
+        let expected_5 = Tau(bitvec![u32, Msb0; 1,0,1,1,0]);
+
+        assert_eq!(expected_0, tau.try_get_parent_at_height(0).unwrap());
+        assert_eq!(expected_1, tau.try_get_parent_at_height(1).unwrap());
+        assert_eq!(expected_5, tau.try_get_parent_at_height(5).unwrap());
+        assert_eq!(tau, tau.try_get_parent_at_height(7).unwrap());
+        assert!(tau.try_get_parent_at_height(8).is_err())
+    }
+
+    #[test]
+    fn converting_tau_to_epoch() {
+        let params = setup();
+
+        let tau0: Tau = Epoch::new(0).into();
+        let tau1: Tau = Epoch::new(1).into();
+        let tau42: Tau = Epoch::new(42).into();
+        let tau_big: Tau = Epoch::new(3292547435).into();
+
+        assert_eq!(Epoch::new(0), Epoch::try_from_tau(&tau0, &params).unwrap());
+        assert_eq!(Epoch::new(1), Epoch::try_from_tau(&tau1, &params).unwrap());
+        assert_eq!(
+            Epoch::new(42),
+            Epoch::try_from_tau(&tau42, &params).unwrap()
+        );
+        assert_eq!(
+            Epoch::new(3292547435),
+            Epoch::try_from_tau(&tau_big, &params).unwrap()
+        );
+
+        assert!(Epoch::try_from_tau(&Tau(BitVec::new()), &params).is_err());
+        assert!(Epoch::try_from_tau(&Tau(bitvec![u32, Msb0; 1,0,1,1,0]), &params).is_err());
+        let _31bit_tau = Tau(bitvec![u32, Msb0;
+            1, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1,
+            0, 1
+        ]);
+        assert!(Epoch::try_from_tau(&_31bit_tau, &params).is_err());
+
+        let _33bit_tau = Tau(bitvec![u32, Msb0;
+            1, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1,
+            0, 1, 1, 0
+        ]);
+        assert!(Epoch::try_from_tau(&_33bit_tau, &params).is_err());
+    }
+
+    #[test]
+    fn tau_roundtrip() {
+        let good_taus = vec![
+            Tau::new_root(),
+            Tau::new(0),
+            Tau::new(1),
+            Tau::new(2),
+            Tau::new(42),
+            Tau::new(123456),
+            Tau::new(3292547435),
+            Tau::new(u32::MAX),
+        ];
+
+        for tau in good_taus {
+            let bytes = tau.to_bytes();
+            let recovered = Tau::try_from_bytes(&bytes).unwrap();
+            assert_eq!(tau, recovered);
+        }
+
+        // more valid variants
+        let mut another_tau = Tau::new(u32::MAX);
+        another_tau.0.push(true);
+        another_tau.0.push(false);
+        another_tau.0.push(true);
+
+        let bytes = another_tau.to_bytes();
+        let recovered = Tau::try_from_bytes(&bytes).unwrap();
+        assert_eq!(another_tau, recovered);
+
+        // ensure there are no panics
+        let big_length_bytes = [255, 255, 255, 255, 42];
+        assert!(Tau::try_from_bytes(&big_length_bytes).is_err());
+
+        assert!(Tau::try_from_bytes(&[]).is_err());
+        assert!(Tau::try_from_bytes(&[1, 1, 1, 1]).is_err());
+        assert!(Tau::try_from_bytes(&[0, 0, 0, 1]).is_err());
+        assert!(Tau::try_from_bytes(&[1, 0, 0, 0]).is_err());
+        assert!(Tau::try_from_bytes(&[1, 0, 0]).is_err());
+    }
+}

common/crypto/dkg/src/bte/proof_discrete_log.rs

@@ -0,0 +1,94 @@
+// Copyright 2022 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use crate::utils::hash_to_scalar;
+use bls12_381::{G1Projective, Scalar};
+use ff::Field;
+use group::GroupEncoding;
+use rand_core::RngCore;
+use zeroize::Zeroize;
+
+// Domain tries to follow guidelines specified by:
+// https://datatracker.ietf.org/doc/html/draft-irtf-cfrg-hash-to-curve-11#section-3.1
+const DISCRETE_LOG_DOMAIN: &[u8] =
+    b"NYM_COCONUT_NIDKG_V01_CS01_WITH_BLS12381_XMD:SHA-256_SSWU_RO_PROOF_DISCRETE_LOG";
+
+#[derive(Debug)]
+#[cfg_attr(test, derive(PartialEq))]
+pub struct ProofOfDiscreteLog {
+    pub(crate) rand_commitment: G1Projective,
+    pub(crate) response: Scalar,
+}
+
+impl ProofOfDiscreteLog {
+    pub fn construct(mut rng: impl RngCore, public: &G1Projective, witness: &Scalar) -> Self {
+        let mut rand_x = Scalar::random(&mut rng);
+        let rand_commitment = G1Projective::generator() * rand_x;
+        let challenge = Self::compute_challenge(public, &rand_commitment);
+
+        let response = rand_x + challenge * witness;
+        rand_x.zeroize();
+
+        ProofOfDiscreteLog {
+            rand_commitment,
+            response,
+        }
+    }
+
+    // note: we don't have to explicitly check whether points are on correct curves / fields
+    // as if they weren't, they'd fail to get deserialized
+    pub fn verify(&self, public: &G1Projective) -> bool {
+        let challenge = Self::compute_challenge(public, &self.rand_commitment);
+
+        // y^c • a == g1^rand_x
+        public * challenge + self.rand_commitment == G1Projective::generator() * self.response
+    }
+
+    pub(crate) fn compute_challenge(public: &G1Projective, rand_commit: &G1Projective) -> Scalar {
+        let public_bytes = public.to_bytes();
+        let rand_commit_bytes = rand_commit.to_bytes();
+
+        let mut bytes = Vec::with_capacity(96);
+        bytes.extend_from_slice(public_bytes.as_ref());
+        bytes.extend_from_slice(rand_commit_bytes.as_ref());
+
+        hash_to_scalar(bytes, DISCRETE_LOG_DOMAIN)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use rand_core::SeedableRng;
+
+    #[test]
+    fn should_verify_a_valid_proof() {
+        let dummy_seed = [1u8; 32];
+        let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+
+        let witness = Scalar::random(&mut rng);
+        let public = G1Projective::generator() * witness;
+
+        let proof = ProofOfDiscreteLog::construct(&mut rng, &public, &witness);
+
+        assert!(proof.verify(&public))
+    }
+
+    #[test]
+    fn should_fail_on_invalid_proof() {
+        let dummy_seed = [1u8; 32];
+        let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+
+        let witness = Scalar::random(&mut rng);
+        let public = G1Projective::generator() * witness;
+
+        let other_witness = Scalar::random(&mut rng);
+        let other_public = G1Projective::generator() * other_witness;
+
+        let proof = ProofOfDiscreteLog::construct(&mut rng, &public, &witness);
+        let other_proof = ProofOfDiscreteLog::construct(&mut rng, &other_public, &other_witness);
+
+        assert!(!proof.verify(&other_public));
+        assert!(!other_proof.verify(&public));
+    }
+}

common/crypto/dkg/src/bte/proof_sharing.rs

@@ -0,0 +1,615 @@
+// Copyright 2022 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use crate::bte::PublicKey;
+use crate::error::DkgError;
+use crate::interpolation::polynomial::PublicCoefficients;
+use crate::utils::{deserialize_g1, deserialize_g2, deserialize_scalar, hash_to_scalar};
+use crate::{NodeIndex, Share};
+use bls12_381::{G1Projective, G2Projective, Scalar};
+use ff::Field;
+use group::GroupEncoding;
+use rand_core::RngCore;
+use std::collections::BTreeMap;
+
+// Domain tries to follow guidelines specified by:
+// https://datatracker.ietf.org/doc/html/draft-irtf-cfrg-hash-to-curve-11#section-3.1
+const INSTANCE_DOMAIN: &[u8] =
+    b"NYM_COCONUT_NIDKG_V01_CS01_WITH_BLS12381_XMD:SHA-256_SSWU_RO_PROOF_SECRET_SHARING_INSTANCE";
+
+const CHALLENGE_DOMAIN: &[u8] =
+    b"NYM_COCONUT_NIDKG_V01_CS01_WITH_BLS12381_XMD:SHA-256_SSWU_RO_PROOF_SECRET_SHARING_CHALLENGE";
+
+#[cfg_attr(test, derive(Clone))]
+pub struct Instance<'a> {
+    public_keys: &'a BTreeMap<NodeIndex, PublicKey>,
+    public_coefficients: &'a PublicCoefficients,
+    combined_randomizer: &'a G1Projective,
+    combined_ciphertexts: &'a [G1Projective],
+}
+
+impl<'a> Instance<'a> {
+    pub fn new(
+        public_keys: &'a BTreeMap<NodeIndex, PublicKey>,
+        public_coefficients: &'a PublicCoefficients,
+        combined_randomizer: &'a G1Projective,
+        combined_ciphertexts: &'a [G1Projective],
+    ) -> Instance<'a> {
+        Instance {
+            public_keys,
+            public_coefficients,
+            combined_randomizer,
+            combined_ciphertexts,
+        }
+    }
+
+    fn hash_to_scalar(&self) -> Scalar {
+        let g1s = self.public_keys.len() + 1 + self.combined_ciphertexts.len();
+        let g2s = self.public_coefficients.size();
+        let mut bytes = Vec::with_capacity(g1s * 48 + g2s * 96);
+
+        for pk in self.public_keys.values() {
+            bytes.extend_from_slice(pk.0.to_bytes().as_ref())
+        }
+        for coeff in self.public_coefficients.inner() {
+            bytes.extend_from_slice(coeff.to_bytes().as_ref())
+        }
+        bytes.extend_from_slice(self.combined_randomizer.to_bytes().as_ref());
+
+        for ciphertext in self.combined_ciphertexts {
+            bytes.extend_from_slice(ciphertext.to_bytes().as_ref())
+        }
+
+        hash_to_scalar(&bytes, INSTANCE_DOMAIN)
+    }
+
+    fn validate(&self) -> bool {
+        if self.public_keys.is_empty() || self.public_coefficients.is_empty() {
+            return false;
+        }
+
+        if self.public_keys.len() != self.combined_ciphertexts.len() {
+            return false;
+        }
+
+        true
+    }
+}
+
+#[derive(Debug)]
+#[cfg_attr(test, derive(Clone, PartialEq))]
+pub struct ProofOfSecretSharing {
+    ff: G1Projective,
+    aa: G2Projective,
+    yy: G1Projective,
+    response_r: Scalar,
+    response_alpha: Scalar,
+}
+
+impl ProofOfSecretSharing {
+    pub fn construct(
+        mut rng: impl RngCore,
+        instance: Instance,
+        witness_r: &Scalar,
+        witnesses_s: &[Share],
+    ) -> Result<Self, DkgError> {
+        if !instance.validate() {
+            return Err(DkgError::MalformedProofOfSharingInstance);
+        }
+
+        let g1 = G1Projective::generator();
+        let g2 = G2Projective::generator();
+
+        let x = instance.hash_to_scalar();
+
+        // alpha, rho ← random_scalars
+        let alpha = Scalar::random(&mut rng);
+        let rho = Scalar::random(&mut rng);
+
+        // F = g1^rho
+        let ff = g1 * rho;
+        // A = g2^alpha
+        let aa = g2 * alpha;
+
+        // Y = (y_1^{x^1} • ...  y_n^{x^n})^rho • g1^alpha
+        // produce intermediate product (y_1^{x^1} • ...  y_n^{x^n})
+        let product =
+            instance
+                .public_keys
+                .values()
+                .rev()
+                .fold(G1Projective::identity(), |mut acc, pk| {
+                    acc += pk.0;
+                    acc *= x;
+                    acc
+                });
+        let yy = product * rho + g1 * alpha;
+
+        let challenge = Self::compute_challenge(&x, &ff, &aa, &yy);
+
+        // response_r = r • challenge + rho
+        let response_r = witness_r * challenge + rho;
+
+        // response_alpha = (share_1 • x^1 + ... share_n • x^n) • challenge + alpha
+        // produce intermediate sum (share_1 • x^1 + ... share_n • x^n)
+        let sum = witnesses_s
+            .iter()
+            .rev()
+            .fold(Scalar::zero(), |mut acc, witness| {
+                acc += witness.inner();
+                acc *= x;
+                acc
+            });
+        let response_alpha = sum * challenge + alpha;
+
+        Ok(ProofOfSecretSharing {
+            ff,
+            aa,
+            yy,
+            response_r,
+            response_alpha,
+        })
+    }
+
+    pub fn verify(&self, instance: Instance) -> bool {
+        if !instance.validate() {
+            return false;
+        }
+
+        let g1 = G1Projective::generator();
+        let g2 = G2Projective::generator();
+
+        let x = instance.hash_to_scalar();
+        let challenge = Self::compute_challenge(&x, &self.ff, &self.aa, &self.yy);
+
+        // check if R^challenge * F == g1^response_r
+        if instance.combined_randomizer * challenge + self.ff != g1 * self.response_r {
+            return false;
+        }
+
+        // check if
+        // (A_0 ^ (id1^0 • x^1 + ... idn^0 • x^n) • ... A_{t-1} ^ (id1^{t-1} • x^{t-1} + ... idn^{t-1} • x^n))^challenge * A
+        // ==
+        // g2^response_alpha
+        let product = instance
+            .public_coefficients
+            .inner()
+            .iter()
+            .enumerate()
+            .fold(G2Projective::identity(), |mut acc, (k, coeff)| {
+                // intermediate (id1^k • x^1 + ... + idn^k • x^n) sum
+                let sum: Scalar = instance
+                    .public_keys
+                    .keys()
+                    .enumerate()
+                    .map(|(i, node_id)| {
+                        let id_scalar = Scalar::from(*node_id);
+                        id_scalar.pow(&[k as u64, 0, 0, 0]) * x.pow(&[(i + 1) as u64, 0, 0, 0])
+                    })
+                    .sum();
+
+                acc += coeff * sum;
+                acc
+            });
+
+        if product * challenge + self.aa != g2 * self.response_alpha {
+            return false;
+        }
+
+        // check if
+        // (ciphertext_1 ^ (x^1) • ... ciphertext_n ^ (x^n)) ^ challenge • Y
+        // ==
+        // (pk_1 ^ (x^1) • ... pk_n ^ (x^n)) ^ response_r • g1^response_alpha
+
+        let product_1 = instance.combined_ciphertexts.iter().rev().fold(
+            G1Projective::identity(),
+            |mut acc, ciphertext| {
+                acc += ciphertext;
+                acc *= x;
+                acc
+            },
+        );
+
+        let product_2 =
+            instance
+                .public_keys
+                .values()
+                .rev()
+                .fold(G1Projective::identity(), |mut acc, pk| {
+                    acc += pk.0;
+                    acc *= x;
+                    acc
+                });
+
+        if product_1 * challenge + self.yy != product_2 * self.response_r + g1 * self.response_alpha
+        {
+            return false;
+        }
+
+        true
+    }
+
+    pub(crate) fn compute_challenge(
+        commitment: &Scalar,
+        blinder_g1: &G1Projective,
+        blinder_g2: &G2Projective,
+        blinded_instance: &G1Projective,
+    ) -> Scalar {
+        let mut bytes = Vec::with_capacity(224);
+
+        bytes.extend_from_slice(commitment.to_bytes().as_ref());
+        bytes.extend_from_slice(blinder_g1.to_bytes().as_ref());
+        bytes.extend_from_slice(blinder_g2.to_bytes().as_ref());
+        bytes.extend_from_slice(blinded_instance.to_bytes().as_ref());
+
+        hash_to_scalar(&bytes, CHALLENGE_DOMAIN)
+    }
+
+    pub(crate) fn to_bytes(&self) -> Vec<u8> {
+        // we have 2 G1 elements, single G2 element and 2 scalars
+        let mut bytes = Vec::with_capacity(2 * 48 + 96 + 2 * 32);
+        bytes.extend_from_slice(self.ff.to_bytes().as_ref());
+        bytes.extend_from_slice(self.aa.to_bytes().as_ref());
+        bytes.extend_from_slice(self.yy.to_bytes().as_ref());
+        bytes.extend_from_slice(self.response_r.to_bytes().as_ref());
+        bytes.extend_from_slice(self.response_alpha.to_bytes().as_ref());
+        bytes
+    }
+
+    pub(crate) fn try_from_bytes(bytes: &[u8]) -> Result<Self, DkgError> {
+        if bytes.len() != 2 * 48 + 96 + 2 * 32 {
+            return Err(DkgError::new_deserialization_failure(
+                "ProofOfSecretSharing",
+                "invalid number of bytes provided",
+            ));
+        }
+
+        let mut i = 0;
+        let f = deserialize_g1(&bytes[i..i + 48]).ok_or_else(|| {
+            DkgError::new_deserialization_failure("ProofOfSecretSharing.f", "invalid curve point")
+        })?;
+        i += 48;
+
+        let a = deserialize_g2(&bytes[i..i + 96]).ok_or_else(|| {
+            DkgError::new_deserialization_failure("ProofOfSecretSharing.a", "invalid curve point")
+        })?;
+        i += 96;
+
+        let y = deserialize_g1(&bytes[i..i + 48]).ok_or_else(|| {
+            DkgError::new_deserialization_failure("ProofOfSecretSharing.y", "invalid curve point")
+        })?;
+        i += 48;
+
+        let response_r = deserialize_scalar(&bytes[i..i + 32]).ok_or_else(|| {
+            DkgError::new_deserialization_failure(
+                "ProofOfSecretSharing.response_r",
+                "invalid scalar",
+            )
+        })?;
+        i += 32;
+
+        let response_alpha = deserialize_scalar(&bytes[i..]).ok_or_else(|| {
+            DkgError::new_deserialization_failure(
+                "ProofOfSecretSharing.response_alpha",
+                "invalid scalar",
+            )
+        })?;
+
+        Ok(ProofOfSecretSharing {
+            ff: f,
+            aa: a,
+            yy: y,
+            response_r,
+            response_alpha,
+        })
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::interpolation::polynomial::Polynomial;
+    use group::Group;
+    use rand_core::SeedableRng;
+
+    const NODES: u64 = 50;
+    const THRESHOLD: u64 = 40;
+
+    fn setup(
+        mut rng: impl RngCore,
+    ) -> (
+        BTreeMap<NodeIndex, PublicKey>,
+        PublicCoefficients,
+        G1Projective,
+        Vec<G1Projective>,
+        Scalar,
+        Vec<Share>,
+    ) {
+        let g1 = G1Projective::generator();
+
+        let mut pks = BTreeMap::new();
+        let polynomial = Polynomial::new_random(&mut rng, THRESHOLD - 1);
+        let public_coefficients = polynomial.public_coefficients();
+
+        let mut shares: Vec<Share> = Vec::new();
+        let mut node_indices = (0..NODES).map(|_| rng.next_u64()).collect::<Vec<_>>();
+        node_indices.sort_unstable();
+
+        for node_index in node_indices {
+            let share = polynomial.evaluate_at(&Scalar::from(node_index));
+            shares.push(share.into());
+            pks.insert(node_index, PublicKey(g1 * Scalar::random(&mut rng)));
+        }
+
+        let r = Scalar::random(&mut rng);
+        let rr = g1 * r;
+
+        let ciphertexts = pks
+            .values()
+            .zip(&shares)
+            .map(|(pk, share)| pk.0 * r + g1 * share.inner())
+            .collect();
+        (pks, public_coefficients, rr, ciphertexts, r, shares)
+    }
+
+    #[test]
+    fn should_fail_to_create_proof_with_invalid_instance() {
+        let dummy_seed = [1u8; 32];
+        let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+
+        let g1 = G1Projective::generator();
+
+        let mut pks = BTreeMap::new();
+        let polynomial = Polynomial::new_random(&mut rng, THRESHOLD - 1);
+        let public_coefficients = polynomial.public_coefficients();
+
+        let mut shares: Vec<Share> = Vec::new();
+        for _ in 0..NODES {
+            let node_index = rng.next_u64();
+            let share = polynomial.evaluate_at(&Scalar::from(node_index));
+            shares.push(share.into());
+            pks.insert(node_index, PublicKey(g1 * Scalar::random(&mut rng)));
+        }
+
+        let r = Scalar::random(&mut rng);
+        let rr = g1 * r;
+
+        let mut shares = Vec::new();
+        for node_id in 1..NODES + 1 {
+            let share = polynomial.evaluate_at(&Scalar::from(node_id));
+            shares.push(share);
+        }
+
+        let ciphertexts = pks
+            .values()
+            .zip(&shares)
+            .map(|(pk, share)| pk.0 * r + g1 * share)
+            .collect::<Vec<_>>();
+
+        // no public keys
+        let bad_instance1 = Instance {
+            public_keys: &BTreeMap::new(),
+            public_coefficients: &public_coefficients,
+            combined_randomizer: &rr,
+            combined_ciphertexts: &ciphertexts,
+        };
+        assert!(!bad_instance1.validate());
+
+        // no public coefficients
+        let bad_instance2 = Instance {
+            public_keys: &pks,
+            public_coefficients: &PublicCoefficients {
+                coefficients: Vec::new(),
+            },
+            combined_randomizer: &rr,
+            combined_ciphertexts: &ciphertexts,
+        };
+        assert!(!bad_instance2.validate());
+
+        // no ciphertexts
+        let bad_instance3 = Instance {
+            public_keys: &pks,
+            public_coefficients: &public_coefficients,
+            combined_randomizer: &rr,
+            combined_ciphertexts: &[],
+        };
+        assert!(!bad_instance3.validate());
+
+        // public_keys.len() != combined_ciphertexts.len()
+        let bad_ciphertexts = ciphertexts.iter().skip(1).cloned().collect::<Vec<_>>();
+
+        let bad_instance4 = Instance {
+            public_keys: &pks,
+            public_coefficients: &public_coefficients,
+            combined_randomizer: &rr,
+            combined_ciphertexts: &bad_ciphertexts,
+        };
+        assert!(!bad_instance4.validate());
+
+        // changed index of one of the keys
+        let mut bad_pks = pks.clone();
+        let first_id = bad_pks.keys().copied().take(1).collect::<Vec<_>>();
+        let first_val = bad_pks.remove(&first_id[0]).unwrap();
+        bad_pks.insert(rng.next_u64(), first_val);
+
+        let bad_instance5 = Instance {
+            public_keys: &bad_pks,
+            public_coefficients: &public_coefficients,
+            combined_randomizer: &rr,
+            combined_ciphertexts: &bad_ciphertexts,
+        };
+        assert!(!bad_instance5.validate());
+
+        let good_instance = Instance {
+            public_keys: &pks,
+            public_coefficients: &public_coefficients,
+            combined_randomizer: &rr,
+            combined_ciphertexts: &ciphertexts,
+        };
+        assert!(good_instance.validate())
+    }
+
+    #[test]
+    fn should_verify_a_valid_proof() {
+        let dummy_seed = [1u8; 32];
+        let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+
+        let (public_keys, public_coefficients, rr, ciphertexts, r, shares) = setup(&mut rng);
+
+        let instance = Instance {
+            public_keys: &public_keys,
+            public_coefficients: &public_coefficients,
+            combined_randomizer: &rr,
+            combined_ciphertexts: &ciphertexts,
+        };
+
+        let sharing_proof =
+            ProofOfSecretSharing::construct(&mut rng, instance.clone(), &r, &shares).unwrap();
+
+        assert!(sharing_proof.verify(instance))
+    }
+
+    #[test]
+    fn should_fail_to_verify_proof_with_invalid_instance() {
+        let dummy_seed = [1u8; 32];
+        let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+
+        let (public_keys, public_coefficients, rr, ciphertexts, r, shares) = setup(&mut rng);
+
+        let instance = Instance {
+            public_keys: &public_keys,
+            public_coefficients: &public_coefficients,
+            combined_randomizer: &rr,
+            combined_ciphertexts: &ciphertexts,
+        };
+
+        let sharing_proof =
+            ProofOfSecretSharing::construct(&mut rng, instance.clone(), &r, &shares).unwrap();
+
+        // no public keys
+        let bad_instance1 = Instance {
+            public_keys: &BTreeMap::new(),
+            public_coefficients: &public_coefficients,
+            combined_randomizer: &rr,
+            combined_ciphertexts: &ciphertexts,
+        };
+        assert!(!sharing_proof.verify(bad_instance1));
+
+        // no public coefficients
+        let bad_instance2 = Instance {
+            public_keys: &public_keys,
+            public_coefficients: &PublicCoefficients {
+                coefficients: Vec::new(),
+            },
+            combined_randomizer: &rr,
+            combined_ciphertexts: &ciphertexts,
+        };
+        assert!(!sharing_proof.verify(bad_instance2));
+
+        // no ciphertexts
+        let bad_instance3 = Instance {
+            public_keys: &public_keys,
+            public_coefficients: &public_coefficients,
+            combined_randomizer: &rr,
+            combined_ciphertexts: &[],
+        };
+        assert!(!sharing_proof.verify(bad_instance3));
+
+        // public_keys.len() != combined_ciphertexts.len()
+        let bad_ciphertexts = ciphertexts.iter().skip(1).cloned().collect::<Vec<_>>();
+
+        let bad_instance4 = Instance {
+            public_keys: &public_keys,
+            public_coefficients: &public_coefficients,
+            combined_randomizer: &rr,
+            combined_ciphertexts: &bad_ciphertexts,
+        };
+        assert!(!sharing_proof.verify(bad_instance4));
+    }
+
+    #[test]
+    fn should_fail_to_verify_proof_with_wrong_instance() {
+        let dummy_seed = [1u8; 32];
+        let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+
+        let (public_keys, public_coefficients, rr, ciphertexts, r, shares) = setup(&mut rng);
+
+        let instance = Instance {
+            public_keys: &public_keys,
+            public_coefficients: &public_coefficients,
+            combined_randomizer: &rr,
+            combined_ciphertexts: &ciphertexts,
+        };
+
+        let sharing_proof =
+            ProofOfSecretSharing::construct(&mut rng, instance.clone(), &r, &shares).unwrap();
+
+        let (public_keys, public_coefficients, rr, ciphertexts, _, _) = setup(&mut rng);
+        let bad_instance = Instance {
+            public_keys: &public_keys,
+            public_coefficients: &public_coefficients,
+            combined_randomizer: &rr,
+            combined_ciphertexts: &ciphertexts,
+        };
+
+        assert!(!sharing_proof.verify(bad_instance));
+    }
+
+    #[test]
+    fn should_fail_to_verify_invalid_proof() {
+        let dummy_seed = [1u8; 32];
+        let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+
+        let (public_keys, public_coefficients, rr, ciphertexts, r, shares) = setup(&mut rng);
+
+        let instance = Instance {
+            public_keys: &public_keys,
+            public_coefficients: &public_coefficients,
+            combined_randomizer: &rr,
+            combined_ciphertexts: &ciphertexts,
+        };
+
+        let good_proof =
+            ProofOfSecretSharing::construct(&mut rng, instance.clone(), &r, &shares).unwrap();
+
+        let mut bad_proof = good_proof.clone();
+        bad_proof.ff = G1Projective::generator();
+        assert!(!bad_proof.verify(instance.clone()));
+
+        let mut bad_proof = good_proof.clone();
+        bad_proof.aa = G2Projective::generator();
+        assert!(!bad_proof.verify(instance.clone()));
+
+        let mut bad_proof = good_proof.clone();
+        bad_proof.yy = G1Projective::generator();
+        assert!(!bad_proof.verify(instance.clone()));
+
+        let mut bad_proof = good_proof.clone();
+        bad_proof.response_r = Scalar::from(42);
+        assert!(!bad_proof.verify(instance.clone()));
+
+        let mut bad_proof = good_proof;
+        bad_proof.response_alpha = Scalar::from(42);
+        assert!(!bad_proof.verify(instance));
+    }
+
+    #[test]
+    fn proof_of_secret_sharing_roundtrip() {
+        let dummy_seed = [1u8; 32];
+        let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+
+        let proof_fixture = ProofOfSecretSharing {
+            ff: G1Projective::random(&mut rng),
+            aa: G2Projective::random(&mut rng),
+            yy: G1Projective::random(&mut rng),
+            response_r: Scalar::random(&mut rng),
+            response_alpha: Scalar::random(&mut rng),
+        };
+
+        let bytes = proof_fixture.to_bytes();
+        let recovered = ProofOfSecretSharing::try_from_bytes(&bytes).unwrap();
+        assert_eq!(proof_fixture, recovered);
+
+        assert!(ProofOfSecretSharing::try_from_bytes(&bytes[1..]).is_err())
+    }
+}

common/crypto/dkg/src/dealing.rs

@@ -0,0 +1,500 @@
+// Copyright 2022 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use crate::bte::proof_chunking::ProofOfChunking;
+use crate::bte::proof_sharing::ProofOfSecretSharing;
+use crate::bte::{
+    encrypt_shares, proof_chunking, proof_sharing, Ciphertexts, Epoch, Params, PublicKey,
+};
+use crate::error::DkgError;
+use crate::interpolation::polynomial::{Polynomial, PublicCoefficients};
+use crate::interpolation::{
+    perform_lagrangian_interpolation_at_origin, perform_lagrangian_interpolation_at_x,
+};
+use crate::{NodeIndex, Share, Threshold};
+use bls12_381::{G2Projective, Scalar};
+use rand_core::RngCore;
+use std::collections::BTreeMap;
+use zeroize::Zeroize;
+
+#[derive(Debug)]
+#[cfg_attr(test, derive(PartialEq))]
+pub struct Dealing {
+    pub public_coefficients: PublicCoefficients,
+    pub ciphertexts: Ciphertexts,
+    pub proof_of_chunking: ProofOfChunking,
+    pub proof_of_sharing: ProofOfSecretSharing,
+}
+
+impl Dealing {
+    // I'm not a big fan of this function signature, but I'm not clear on how to improve it while
+    // allowing the dealer to skip decryption of its own share if it was also one of the receivers
+    pub fn create(
+        mut rng: impl RngCore,
+        params: &Params,
+        dealer_index: NodeIndex,
+        threshold: Threshold,
+        epoch: Epoch,
+        // BTreeMap ensures the keys are sorted by their indices
+        receivers: &BTreeMap<NodeIndex, PublicKey>,
+        prior_resharing_secret: Option<Scalar>,
+    ) -> (Self, Option<Share>) {
+        assert!(threshold > 0);
+
+        let mut polynomial = Polynomial::new_random(&mut rng, threshold - 1);
+        if let Some(prior_secret) = prior_resharing_secret {
+            polynomial.set_constant_coefficient(prior_secret)
+        }
+
+        let mut shares = receivers
+            .keys()
+            .map(|&node_index| polynomial.evaluate_at(&Scalar::from(node_index)).into())
+            .collect::<Vec<_>>();
+
+        let remote_share_key_pairs = shares
+            .iter()
+            .zip(receivers.values())
+            .map(|(share, key)| (share, key))
+            .collect::<Vec<_>>();
+        let ordered_public_keys = receivers.values().copied().collect::<Vec<_>>();
+
+        let (ciphertexts, hazmat) =
+            encrypt_shares(&remote_share_key_pairs, epoch, params, &mut rng);
+
+        // create proofs of knowledge
+        let chunking_instance = proof_chunking::Instance::new(&ordered_public_keys, &ciphertexts);
+        let proof_of_chunking =
+            ProofOfChunking::construct(&mut rng, chunking_instance, hazmat.r(), &shares)
+                .expect("failed to construct proof of chunking");
+
+        let combined_ciphertexts = ciphertexts.combine_ciphertexts();
+        let mut combined_r = hazmat.combine_rs();
+        let combined_rr = ciphertexts.combine_rs();
+
+        let public_coefficients = polynomial.public_coefficients();
+        let sharing_instance = proof_sharing::Instance::new(
+            receivers,
+            &public_coefficients,
+            &combined_rr,
+            &combined_ciphertexts,
+        );
+        let proof_of_sharing =
+            ProofOfSecretSharing::construct(&mut rng, sharing_instance, &combined_r, &shares)
+                .expect("failed to construct proof of secret sharing");
+
+        combined_r.zeroize();
+
+        let dealing = Dealing {
+            public_coefficients,
+            ciphertexts,
+            proof_of_chunking,
+            proof_of_sharing,
+        };
+
+        let dealers_key_index = receivers
+            .keys()
+            .position(|node_index| node_index == &dealer_index);
+        if let Some(dealer_key_index) = dealers_key_index {
+            let dealers_share = shares.remove(dealer_key_index);
+            shares.zeroize();
+            (dealing, Some(dealers_share))
+        } else {
+            (dealing, None)
+        }
+    }
+
+    // rather than returning a bool for whether the dealing is valid or not, a Result is returned
+    // instead so that we would have more information regarding a possible failure cause
+    pub fn verify(
+        &self,
+        params: &Params,
+        epoch: Epoch,
+        threshold: Threshold,
+        receivers: &BTreeMap<NodeIndex, PublicKey>,
+        prior_resharing_public: Option<G2Projective>,
+    ) -> Result<(), DkgError> {
+        if threshold == 0 || threshold as usize > receivers.len() {
+            return Err(DkgError::InvalidThreshold {
+                actual: threshold as usize,
+                participating: receivers.len(),
+            });
+        }
+
+        if self.ciphertexts.ciphertext_chunks.len() != receivers.len() {
+            return Err(DkgError::WrongCiphertextSize {
+                actual: self.ciphertexts.ciphertext_chunks.len(),
+                expected: receivers.len(),
+            });
+        }
+
+        if self.public_coefficients.size() != threshold as usize {
+            return Err(DkgError::WrongPublicCoefficientsSize {
+                actual: self.public_coefficients.size(),
+                expected: threshold as usize,
+            });
+        }
+
+        if !self.ciphertexts.verify_integrity(params, epoch) {
+            return Err(DkgError::FailedCiphertextIntegrityCheck);
+        }
+
+        // TODO: perhaps change the underlying arguments in proofs of knowledge to avoid this allocation?
+        let sorted_receivers = receivers.values().copied().collect::<Vec<_>>();
+
+        let chunking_instance = proof_chunking::Instance::new(&sorted_receivers, &self.ciphertexts);
+        if !self.proof_of_chunking.verify(chunking_instance) {
+            return Err(DkgError::InvalidProofOfChunking);
+        }
+
+        let combined_randomizer = &self.ciphertexts.combine_rs();
+        let combined_ciphertexts = &self.ciphertexts.combine_ciphertexts();
+
+        let sharing_instance = proof_sharing::Instance::new(
+            receivers,
+            &self.public_coefficients,
+            combined_randomizer,
+            combined_ciphertexts,
+        );
+
+        if !self.proof_of_sharing.verify(sharing_instance) {
+            return Err(DkgError::InvalidProofOfSharing);
+        }
+
+        if let Some(prior_public) = prior_resharing_public {
+            let dealt_public = &self.public_coefficients[0];
+            if dealt_public != &prior_public {
+                return Err(DkgError::InvalidResharing);
+            }
+        }
+
+        Ok(())
+    }
+
+    // coeff_len || coeff || cc_len || cc || pi_c_len || pi_c || pi_s_len || pi_s
+    pub fn to_bytes(&self) -> Vec<u8> {
+        let mut bytes = Vec::new();
+
+        let mut coefficients_bytes = self.public_coefficients.to_bytes();
+        bytes.extend_from_slice(&(coefficients_bytes.len() as u32).to_be_bytes());
+        bytes.append(&mut coefficients_bytes);
+
+        let mut ciphertexts_bytes = self.ciphertexts.to_bytes();
+        bytes.extend_from_slice(&(ciphertexts_bytes.len() as u32).to_be_bytes());
+        bytes.append(&mut ciphertexts_bytes);
+
+        let mut proof_sharing_bytes = self.proof_of_sharing.to_bytes();
+        bytes.extend_from_slice(&(proof_sharing_bytes.len() as u32).to_be_bytes());
+        bytes.append(&mut proof_sharing_bytes);
+
+        let mut proof_chunking_bytes = self.proof_of_chunking.to_bytes();
+        bytes.extend_from_slice(&(proof_chunking_bytes.len() as u32).to_be_bytes());
+        bytes.append(&mut proof_chunking_bytes);
+
+        bytes
+    }
+
+    pub fn try_from_bytes(bytes: &[u8]) -> Result<Self, DkgError> {
+        // can we read the length of serialized public coefficients?
+        if bytes.len() < 4 {
+            return Err(DkgError::new_deserialization_failure(
+                "Dealing",
+                "insufficient number of bytes provided",
+            ));
+        }
+
+        let mut i = 0;
+        let coefficients_bytes_len =
+            u32::from_be_bytes((&bytes[i..i + 4]).try_into().unwrap()) as usize;
+        i += 4;
+        let public_coefficients =
+            PublicCoefficients::try_from_bytes(&bytes[i..i + coefficients_bytes_len])?;
+        i += coefficients_bytes_len;
+
+        let ciphertexts_bytes_len =
+            u32::from_be_bytes((&bytes[i..i + 4]).try_into().unwrap()) as usize;
+        i += 4;
+        let ciphertexts = Ciphertexts::try_from_bytes(&bytes[i..i + ciphertexts_bytes_len])?;
+        i += ciphertexts_bytes_len;
+
+        let proof_of_sharing_bytes_len =
+            u32::from_be_bytes((&bytes[i..i + 4]).try_into().unwrap()) as usize;
+        i += 4;
+        let proof_of_sharing =
+            ProofOfSecretSharing::try_from_bytes(&bytes[i..i + proof_of_sharing_bytes_len])?;
+        i += proof_of_sharing_bytes_len;
+
+        let proof_of_chunking_bytes_len =
+            u32::from_be_bytes((&bytes[i..i + 4]).try_into().unwrap()) as usize;
+        i += 4;
+
+        if bytes[i..].len() != proof_of_chunking_bytes_len {
+            return Err(DkgError::new_deserialization_failure(
+                "Dealing",
+                "invalid number of bytes provided",
+            ));
+        }
+
+        let proof_of_chunking = ProofOfChunking::try_from_bytes(&bytes[i..])?;
+
+        Ok(Dealing {
+            public_coefficients,
+            ciphertexts,
+            proof_of_chunking,
+            proof_of_sharing,
+        })
+    }
+}
+
+// this assumes all dealings have been verified
+pub fn try_recover_verification_keys(
+    dealings: &[Dealing],
+    threshold: Threshold,
+    receivers: &BTreeMap<NodeIndex, PublicKey>,
+) -> Result<(G2Projective, Vec<G2Projective>), DkgError> {
+    if dealings.is_empty() {
+        return Err(DkgError::NoDealingsAvailable);
+    }
+
+    let threshold_usize = threshold as usize;
+
+    if !dealings
+        .iter()
+        .all(|dealing| dealing.public_coefficients.size() == threshold_usize)
+    {
+        return Err(DkgError::MismatchedDealings);
+    }
+
+    // currently we expect every dealer to also be a receiver. This restriction might be relaxed in the future
+    if dealings.len() != receivers.len() {
+        return Err(DkgError::MismatchedDealings);
+    }
+
+    let indices = receivers.keys().collect::<Vec<_>>();
+
+    // Compute A0, ..., A_{t-1}
+    let mut interpolated_coefficients = Vec::with_capacity(threshold_usize);
+    for k in 0..threshold_usize {
+        let mut samples = Vec::with_capacity(indices.len());
+        for (j, dealing) in dealings.iter().enumerate() {
+            samples.push((
+                Scalar::from(*indices[j]),
+                *dealing.public_coefficients.nth(k),
+            ))
+        }
+        let interpolated = perform_lagrangian_interpolation_at_origin(&samples)?;
+        interpolated_coefficients.push(interpolated);
+    }
+
+    let master_verification_key = interpolated_coefficients[0];
+
+    let interpolated_coefficients = PublicCoefficients {
+        coefficients: interpolated_coefficients,
+    };
+
+    // shvk_j = A0^{j^0} * A1^{j^1} * ... * A_{t-1}^{j^{t-1}}
+    let verification_key_shares = receivers
+        .keys()
+        .map(|index| interpolated_coefficients.evaluate_at(&Scalar::from(*index)))
+        .collect();
+
+    Ok((master_verification_key, verification_key_shares))
+}
+
+pub fn verify_verification_keys(
+    master_key: &G2Projective,
+    shares: &[G2Projective],
+    receivers: &BTreeMap<NodeIndex, PublicKey>,
+    threshold: Threshold,
+) -> Result<(), DkgError> {
+    if shares.len() != receivers.len() {
+        return Err(DkgError::NotEnoughReceiversProvided);
+    }
+
+    if threshold as usize > receivers.len() {
+        return Err(DkgError::InvalidThreshold {
+            actual: threshold as usize,
+            participating: receivers.len(),
+        });
+    }
+
+    let indices = receivers.keys().copied().collect::<Vec<_>>();
+
+    let indices_with_origin = std::iter::once(&0)
+        .chain(receivers.keys())
+        .collect::<Vec<_>>();
+    let all_shares = std::iter::once(master_key)
+        .chain(shares.iter())
+        .collect::<Vec<_>>();
+
+    for (i, share) in shares.iter().enumerate() {
+        let samples = indices_with_origin
+            .iter()
+            .zip(all_shares.iter())
+            .map(|(&node_index, &share)| (Scalar::from(*node_index), *share))
+            .take(threshold as usize)
+            .collect::<Vec<_>>();
+        let interpolated =
+            perform_lagrangian_interpolation_at_x(&Scalar::from(indices[i]), &samples)?;
+        if share != &interpolated {
+            return Err(DkgError::MismatchedVerificationKey);
+        }
+    }
+
+    Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::bte::{decrypt_share, keygen, setup};
+    use crate::combine_shares;
+    use rand_core::SeedableRng;
+
+    #[test]
+    fn recovering_partial_verification_keys() {
+        // START OF SETUP
+        let dummy_seed = [42u8; 32];
+        let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+        let params = setup();
+
+        let threshold = 2;
+        let node_indices = vec![1, 4, 7];
+
+        let mut receivers = BTreeMap::new();
+        let mut full_keys = Vec::new();
+        for index in &node_indices {
+            let (dk, pk) = keygen(&params, &mut rng);
+            receivers.insert(*index, *pk.public_key());
+            full_keys.push((dk, pk))
+        }
+
+        // start off in a defined epoch (i.e. not root);
+        let epoch = Epoch::new(2);
+
+        let dealings = node_indices
+            .iter()
+            .map(|&dealer_index| {
+                Dealing::create(
+                    &mut rng,
+                    &params,
+                    dealer_index,
+                    threshold,
+                    epoch,
+                    &receivers,
+                    None,
+                )
+                .0
+            })
+            .collect::<Vec<_>>();
+
+        let mut derived_secrets = Vec::new();
+        for (i, (ref mut dk, _)) in full_keys.iter_mut().enumerate() {
+            dk.try_update_to(epoch, &params, &mut rng).unwrap();
+
+            let shares = dealings
+                .iter()
+                .map(|dealing| decrypt_share(dk, i, &dealing.ciphertexts, epoch, None).unwrap())
+                .collect();
+            derived_secrets.push(
+                combine_shares(shares, &receivers.keys().copied().collect::<Vec<_>>()).unwrap(),
+            )
+        }
+
+        let master_secret = perform_lagrangian_interpolation_at_origin(&[
+            (Scalar::from(node_indices[2]), derived_secrets[2]),
+            (Scalar::from(node_indices[1]), derived_secrets[1]),
+        ])
+        .unwrap();
+
+        // END OF SETUP
+        let (recovered_master, recovered_partials) =
+            try_recover_verification_keys(&dealings, threshold, &receivers).unwrap();
+
+        let g2 = G2Projective::generator();
+        assert_eq!(g2 * master_secret, recovered_master);
+
+        assert_eq!(g2 * derived_secrets[0], recovered_partials[0]);
+        assert_eq!(g2 * derived_secrets[1], recovered_partials[1]);
+        assert_eq!(g2 * derived_secrets[2], recovered_partials[2]);
+    }
+
+    #[test]
+    fn verifying_partial_verification_keys() {
+        let dummy_seed = [42u8; 32];
+        let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+        let params = setup();
+
+        let threshold = 2;
+        let node_indices = vec![1, 4, 7];
+
+        let mut receivers = BTreeMap::new();
+        let mut full_keys = Vec::new();
+        for index in &node_indices {
+            let (dk, pk) = keygen(&params, &mut rng);
+            receivers.insert(*index, *pk.public_key());
+            full_keys.push((dk, pk))
+        }
+
+        // start off in a defined epoch (i.e. not root);
+        let epoch = Epoch::new(2);
+
+        let dealings = node_indices
+            .iter()
+            .map(|&dealer_index| {
+                Dealing::create(
+                    &mut rng,
+                    &params,
+                    dealer_index,
+                    threshold,
+                    epoch,
+                    &receivers,
+                    None,
+                )
+                .0
+            })
+            .collect::<Vec<_>>();
+
+        let (recovered_master, recovered_partials) =
+            try_recover_verification_keys(&dealings, threshold, &receivers).unwrap();
+
+        assert!(verify_verification_keys(
+            &recovered_master,
+            &recovered_partials,
+            &receivers,
+            threshold
+        )
+        .is_ok())
+    }
+
+    #[test]
+    fn dealing_roundtrip() {
+        let dummy_seed = [1u8; 32];
+        let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+        let params = setup();
+
+        let parties = 5;
+        let threshold = ((parties as f32 * 2.) / 3. + 1.) as Threshold;
+        let node_indices = (1..=parties).collect::<Vec<_>>();
+        let epoch = Epoch::new(2);
+
+        let mut receivers = BTreeMap::new();
+        for index in &node_indices {
+            let (_, pk) = keygen(&params, &mut rng);
+            receivers.insert(*index, *pk.public_key());
+        }
+
+        let (dealing, _) = Dealing::create(
+            &mut rng,
+            &params,
+            node_indices[0],
+            threshold,
+            epoch,
+            &receivers,
+            None,
+        );
+
+        let bytes = dealing.to_bytes();
+        let recovered = Dealing::try_from_bytes(&bytes).unwrap();
+        assert_eq!(dealing, recovered);
+    }
+}

common/crypto/dkg/src/error.rs

@@ -0,0 +1,114 @@
+// Copyright 2022 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use thiserror::Error;
+
+#[derive(Debug, Error)]
+pub enum DkgError {
+    #[error("Provided set of values contained duplicate coordinate")]
+    DuplicateCoordinate,
+
+    #[error("The public key is malformed")]
+    MalformedPublicKey,
+
+    #[error("The decryption key is malformed")]
+    MalformedDecryptionKey,
+
+    #[error("Could not solve the discrete log")]
+    UnsolvableDiscreteLog,
+
+    #[error("Received share is malformed")]
+    MalformedShare,
+
+    #[error("The share encrypted under index {0} doesn't exist")]
+    UnavailableCiphertext(usize),
+
+    #[error("The provided lookup table is mismatched")]
+    MismatchedLookupTable,
+
+    #[error("Failed to verify proof of discrete logarithm")]
+    InvalidProofOfDiscreteLog,
+
+    #[error("Tried to construct proof of sharing with an invalid instance")]
+    MalformedProofOfSharingInstance,
+
+    #[error("Tried to construct proof of chunking with an invalid instance")]
+    MalformedProofOfChunkingInstance,
+
+    #[error("Aborted construction of proof of chunking - could not complete it within specified number of attempts")]
+    AbortedProofOfChunking,
+
+    #[error("Tried to update the decryption key to an epoch in the past")]
+    TargetEpochUpdateInThePast,
+
+    #[error("Provided epoch is malformed")]
+    MalformedEpoch,
+
+    #[error("Provided node is not a valid parent")]
+    NotAValidParent,
+
+    #[error("Provided decryption key has expired")]
+    ExpiredKey,
+
+    #[error("Provided threshold value ({actual}) is either 0 or larger than the total number of the participating parties ({participating})")]
+    InvalidThreshold { actual: usize, participating: usize },
+
+    #[error(
+    "Provided ciphertext has been generated for a different number of participating parties (expected: {expected}, actual: {actual})"
+    )]
+    WrongCiphertextSize { actual: usize, expected: usize },
+
+    #[error(
+    "Provided public coefficients have been generated for a different number of participating parties (expected: {expected}, actual: {actual})"
+    )]
+    WrongPublicCoefficientsSize { actual: usize, expected: usize },
+
+    #[error("The provided ciphertexts failed integrity check")]
+    FailedCiphertextIntegrityCheck,
+
+    #[error("The provided proof of secret sharing was invalid")]
+    InvalidProofOfSharing,
+
+    #[error("The provided proof of chunking was invalid")]
+    InvalidProofOfChunking,
+
+    #[error("Failed to deserialize {name} - {reason}")]
+    DeserializationFailure { name: String, reason: String },
+
+    #[error("No dealings were provided")]
+    NoDealingsAvailable,
+
+    #[error("Provided dealings were created under different parameters")]
+    MismatchedDealings,
+
+    #[error(
+        "Not enough dealings are available. We have {available} while require at least {required}"
+    )]
+    NotEnoughDealingsAvailable { available: usize, required: usize },
+
+    #[error("Received different number of x and y coordinates for lagrangian interpolation (xs: {x}, ys: {y})")]
+    MismatchedLagrangianSamplesLengths { x: usize, y: usize },
+
+    #[error("Derived partial verification key is mismatched")]
+    MismatchedVerificationKey,
+
+    #[error("Insufficient number of receivers was provided")]
+    NotEnoughReceiversProvided,
+
+    #[error(
+        "The reshared dealing has different public constant coefficient than its prior variant"
+    )]
+    InvalidResharing,
+}
+
+impl DkgError {
+    pub fn new_deserialization_failure<S: Into<String>, T: Into<String>>(
+        name: S,
+        reason: T,
+    ) -> DkgError {
+        DkgError::DeserializationFailure {
+            name: name.into(),
+            reason: reason.into(),
+        }
+    }
+}

common/crypto/dkg/src/interpolation/mod.rs

@@ -0,0 +1,157 @@
+// Copyright 2022 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use crate::error::DkgError;
+use bls12_381::Scalar;
+use core::iter::Sum;
+use core::ops::Mul;
+use std::collections::HashSet;
+
+pub mod polynomial;
+
+fn contains_duplicates(vals: &[Scalar]) -> bool {
+    let mut set = HashSet::new();
+
+    for x in vals {
+        if !set.insert(x.to_bytes()) {
+            return true;
+        }
+    }
+
+    false
+}
+
+#[inline]
+fn generate_lagrangian_coefficients_at_x(
+    x: &Scalar,
+    points: &[Scalar],
+) -> Result<Vec<Scalar>, DkgError> {
+    let num_points = points.len();
+    if num_points == 0 {
+        return Ok(Vec::new());
+    } else if num_points == 1 {
+        return Ok(vec![Scalar::one()]);
+    }
+
+    if contains_duplicates(points) {
+        return Err(DkgError::DuplicateCoordinate);
+    }
+
+    let mut res = Vec::with_capacity(points.len());
+
+    for (i, xi) in points.iter().enumerate() {
+        let mut numerator = Scalar::one();
+        let mut denominator = Scalar::one();
+
+        for (j, xj) in points.iter().enumerate() {
+            if j != i {
+                // numerator = (x - xs[0]) * ... * (x - xs[j]), j != i
+                numerator *= x - xj;
+
+                // denominator = (xs[i] - x[0]) * ... * (xs[i] - x[j]), j != i
+                denominator *= xi - xj;
+            }
+        }
+
+        // 1 / denominator
+        let inv: Scalar =
+            Option::from(denominator.invert()).ok_or(DkgError::DuplicateCoordinate)?;
+
+        // numerator / denominator
+        res.push(numerator * inv)
+    }
+
+    Ok(res)
+}
+
+/// Performs a Lagrange interpolation at specified x for a polynomial defined by set of coordinates
+/// (x, f(x)), where x is a `Scalar` and f(x) is a generic type that can be obtained by evaluating `f` at `x`.
+/// It can be used for Scalars, G1 and G2 points.
+pub fn perform_lagrangian_interpolation_at_x<T>(
+    x: &Scalar,
+    points: &[(Scalar, T)],
+) -> Result<T, DkgError>
+where
+    T: Sum,
+    for<'a> &'a T: Mul<Scalar, Output = T>,
+{
+    let xs = points.iter().map(|p| p.0).collect::<Vec<_>>();
+    let coefficients = generate_lagrangian_coefficients_at_x(x, &xs)?;
+
+    Ok(coefficients
+        .into_iter()
+        .zip(points.iter().map(|p| &p.1))
+        .map(|(coeff, y)| y * coeff)
+        .sum())
+}
+
+/// Performs a Lagrange interpolation at the origin for a polynomial defined by set of coordinates
+/// (x, f(x)), where x is a `Scalar` and f(x) is a generic type that can be obtained by evaluating `f` at `x`.
+/// It can be used for Scalars, G1 and G2 points.
+pub fn perform_lagrangian_interpolation_at_origin<T>(points: &[(Scalar, T)]) -> Result<T, DkgError>
+where
+    T: Sum,
+    for<'a> &'a T: Mul<Scalar, Output = T>,
+{
+    perform_lagrangian_interpolation_at_x(&Scalar::zero(), points)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn performing_lagrangian_scalar_interpolation_at_origin() {
+        // x^2 + 3
+        // x, f(x):
+        // 1, 4,
+        // 2, 7,
+        // 3, 12,
+        let points = vec![
+            (Scalar::from(1), Scalar::from(4)),
+            (Scalar::from(2), Scalar::from(7)),
+            (Scalar::from(3), Scalar::from(12)),
+        ];
+        assert_eq!(
+            Scalar::from(3),
+            perform_lagrangian_interpolation_at_origin(&points).unwrap()
+        );
+
+        // x^3 + 3x^2 - 5x + 11
+        // x, f(x):
+        // 1, 10
+        // 2, 21
+        // 3, 50
+        // 4, 103
+        let points = vec![
+            (Scalar::from(1), Scalar::from(10)),
+            (Scalar::from(2), Scalar::from(21)),
+            (Scalar::from(3), Scalar::from(50)),
+            (Scalar::from(4), Scalar::from(103)),
+        ];
+        assert_eq!(
+            Scalar::from(11),
+            perform_lagrangian_interpolation_at_origin(&points).unwrap()
+        );
+
+        // more points than it is required
+        // x^2 + x + 10
+        // x, f(x)
+        // 1, 12
+        // 2, 16
+        // 3, 22
+        // 4, 30
+        // 5, 40
+        let points = vec![
+            (Scalar::from(1), Scalar::from(12)),
+            (Scalar::from(2), Scalar::from(16)),
+            (Scalar::from(3), Scalar::from(22)),
+            (Scalar::from(4), Scalar::from(30)),
+            (Scalar::from(5), Scalar::from(40)),
+        ];
+        assert_eq!(
+            Scalar::from(10),
+            perform_lagrangian_interpolation_at_origin(&points).unwrap()
+        );
+    }
+}

common/crypto/dkg/src/interpolation/polynomial.rs

@@ -0,0 +1,395 @@
+// Copyright 2022 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use crate::error::DkgError;
+use crate::utils::deserialize_g2;
+use bls12_381::{G2Projective, Scalar};
+use ff::Field;
+use group::GroupEncoding;
+use rand_core::RngCore;
+use std::ops::{Add, Index, IndexMut};
+use zeroize::Zeroize;
+
+#[derive(Clone, Debug, PartialEq)]
+pub struct PublicCoefficients {
+    pub(crate) coefficients: Vec<G2Projective>,
+}
+
+impl PublicCoefficients {
+    pub(crate) fn size(&self) -> usize {
+        self.coefficients.len()
+    }
+
+    pub(crate) fn nth(&self, n: usize) -> &G2Projective {
+        &self.coefficients[n]
+    }
+
+    pub(crate) fn is_empty(&self) -> bool {
+        self.coefficients.is_empty()
+    }
+
+    pub(crate) fn inner(&self) -> &[G2Projective] {
+        &self.coefficients
+    }
+
+    pub(crate) fn evaluate_at(&self, x: &Scalar) -> G2Projective {
+        if self.coefficients.is_empty() {
+            G2Projective::identity()
+            // if x is zero then we can ignore most of the expensive computation and
+            // just return the last term of the polynomial
+        } else if x.is_zero().into() {
+            // we checked that coefficients are not empty so unwrap here is fine
+            *self.coefficients.first().unwrap()
+        } else {
+            self.coefficients
+                .iter()
+                .enumerate()
+                // coefficient[n] * x ^ n
+                .map(|(i, coefficient)| coefficient * x.pow(&[i as u64, 0, 0, 0]))
+                .sum()
+        }
+    }
+
+    pub(crate) fn to_bytes(&self) -> Vec<u8> {
+        let coeffs = self.coefficients.len();
+        let mut bytes = Vec::with_capacity(4 + 96 * coeffs);
+        bytes.extend_from_slice(&((coeffs as u32).to_be_bytes()));
+        for coeff in &self.coefficients {
+            bytes.extend_from_slice(coeff.to_bytes().as_ref())
+        }
+
+        bytes
+    }
+
+    pub(crate) fn try_from_bytes(b: &[u8]) -> Result<Self, DkgError> {
+        if b.len() < 4 {
+            return Err(DkgError::new_deserialization_failure(
+                "PublicCoefficients",
+                "insufficient number of bytes provided",
+            ));
+        }
+
+        let coeffs = u32::from_be_bytes([b[0], b[1], b[2], b[3]]) as usize;
+        let mut coefficients = Vec::with_capacity(coeffs);
+
+        if b.len() != 4 + coeffs * 96 {
+            return Err(DkgError::new_deserialization_failure(
+                "PublicCoefficients",
+                "insufficient number of bytes provided",
+            ));
+        }
+
+        let mut i = 4;
+        for _ in 0..coeffs {
+            let coefficient = deserialize_g2(&b[i..i + 96]).ok_or_else(|| {
+                DkgError::new_deserialization_failure(
+                    "PublicCoefficients.coefficient",
+                    "invalid curve point",
+                )
+            })?;
+
+            coefficients.push(coefficient);
+            i += 96;
+        }
+
+        Ok(PublicCoefficients { coefficients })
+    }
+}
+
+impl Index<usize> for PublicCoefficients {
+    type Output = G2Projective;
+
+    fn index(&self, index: usize) -> &Self::Output {
+        self.coefficients.index(index)
+    }
+}
+
+impl IndexMut<usize> for PublicCoefficients {
+    fn index_mut(&mut self, index: usize) -> &mut Self::Output {
+        self.coefficients.index_mut(index)
+    }
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Zeroize)]
+#[zeroize(drop)]
+pub struct Polynomial {
+    coefficients: Vec<Scalar>,
+}
+
+impl Polynomial {
+    // for polynomial of degree n, we generate n+1 values
+    // (for example for degree 1, like y = x + 2, we need [2,1])
+    /// Creates new pseudorandom polynomial of specified degree.
+    pub fn new_random(mut rng: impl RngCore, degree: u64) -> Self {
+        Polynomial {
+            coefficients: (0..=degree).map(|_| Scalar::random(&mut rng)).collect(),
+        }
+    }
+
+    /// Creates new polynomial with provided coefficients.
+    pub fn new(coefficients: Vec<Scalar>) -> Self {
+        Polynomial { coefficients }
+    }
+
+    pub fn set_constant_coefficient(&mut self, value: Scalar) {
+        if self.coefficients.is_empty() {
+            self.coefficients = vec![value]
+        } else {
+            self.coefficients[0] = value
+        }
+    }
+
+    /// Creates a zero-polynomial, i.e. p(x) = 0
+    pub const fn zero() -> Self {
+        Polynomial {
+            coefficients: Vec::new(),
+        }
+    }
+
+    /// Returns public coefficients associated with this polynomial.
+    pub fn public_coefficients(&self) -> PublicCoefficients {
+        let g2 = G2Projective::generator();
+        let coefficients = self.coefficients.iter().map(|a_i| g2 * a_i).collect();
+
+        PublicCoefficients { coefficients }
+    }
+
+    /// Evaluates the polynomial at point x.
+    pub fn evaluate_at(&self, x: &Scalar) -> Scalar {
+        if self.coefficients.is_empty() {
+            Scalar::zero()
+            // if x is zero then we can ignore most of the expensive computation and
+            // just return the last term of the polynomial
+        } else if x.is_zero().into() {
+            // we checked that coefficients are not empty so unwrap here is fine
+            *self.coefficients.first().unwrap()
+        } else {
+            self.coefficients
+                .iter()
+                .enumerate()
+                // coefficient[n] * x ^ n
+                .map(|(i, coefficient)| coefficient * x.pow(&[i as u64, 0, 0, 0]))
+                .sum()
+        }
+    }
+}
+
+impl Index<usize> for Polynomial {
+    type Output = Scalar;
+
+    fn index(&self, index: usize) -> &Self::Output {
+        self.coefficients.index(index)
+    }
+}
+
+impl IndexMut<usize> for Polynomial {
+    fn index_mut(&mut self, index: usize) -> &mut Self::Output {
+        self.coefficients.index_mut(index)
+    }
+}
+
+impl<'b> Add<&'b Polynomial> for Polynomial {
+    type Output = Polynomial;
+
+    fn add(self, rhs: &'b Polynomial) -> Polynomial {
+        &self + rhs
+    }
+}
+
+impl<'a> Add<Polynomial> for &'a Polynomial {
+    type Output = Polynomial;
+
+    fn add(self, rhs: Polynomial) -> Polynomial {
+        self + &rhs
+    }
+}
+
+impl Add<Polynomial> for Polynomial {
+    type Output = Polynomial;
+
+    fn add(self, rhs: Polynomial) -> Polynomial {
+        &self + &rhs
+    }
+}
+
+impl<'a, 'b> Add<&'b Polynomial> for &'a Polynomial {
+    type Output = Polynomial;
+
+    fn add(self, rhs: &'b Polynomial) -> Self::Output {
+        let len = self.coefficients.len();
+        let rhs_len = rhs.coefficients.len();
+
+        // to have easier bound checks
+        if rhs_len > len {
+            return rhs + self;
+        }
+
+        // we know len >= rhs_len and hence the output will also be of size len
+        let mut res = Vec::with_capacity(len);
+
+        for i in 0..len {
+            if let Some(rhs_coeff) = rhs.coefficients.get(i) {
+                res.push(self[i] + rhs_coeff)
+            } else {
+                res.push(self[i])
+            }
+        }
+
+        Polynomial { coefficients: res }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use rand_core::SeedableRng;
+
+    #[test]
+    fn polynomial_evaluation() {
+        // y = 42 (it should be 42 regardless of x)
+        let poly = Polynomial {
+            coefficients: vec![Scalar::from(42)],
+        };
+
+        assert_eq!(Scalar::from(42), poly.evaluate_at(&Scalar::from(1)));
+        assert_eq!(Scalar::from(42), poly.evaluate_at(&Scalar::from(0)));
+        assert_eq!(Scalar::from(42), poly.evaluate_at(&Scalar::from(10)));
+
+        // y = x + 10, at x = 2 (exp: 12)
+        let poly = Polynomial {
+            coefficients: vec![Scalar::from(10), Scalar::from(1)],
+        };
+
+        assert_eq!(Scalar::from(12), poly.evaluate_at(&Scalar::from(2)));
+
+        // y = x^4 - 5x^2 + 2x - 3, at x = 3 (exp: 39)
+        let poly = Polynomial {
+            coefficients: vec![
+                (-Scalar::from(3)),
+                Scalar::from(2),
+                (-Scalar::from(5)),
+                Scalar::zero(),
+                Scalar::from(1),
+            ],
+        };
+
+        assert_eq!(Scalar::from(39), poly.evaluate_at(&Scalar::from(3)));
+
+        // empty polynomial
+        let poly = Polynomial::zero();
+
+        // should always be 0
+        assert_eq!(Scalar::from(0), poly.evaluate_at(&Scalar::from(1)));
+        assert_eq!(Scalar::from(0), poly.evaluate_at(&Scalar::from(0)));
+        assert_eq!(Scalar::from(0), poly.evaluate_at(&Scalar::from(10)));
+    }
+
+    #[test]
+    fn polynomial_addition() {
+        let empty = Polynomial::zero();
+        let p1 = Polynomial {
+            coefficients: vec![Scalar::from(1), Scalar::from(2), Scalar::from(3)],
+        };
+        let p2 = Polynomial {
+            coefficients: vec![Scalar::from(4), Scalar::from(5)],
+        };
+        let expected_sum = Polynomial {
+            coefficients: vec![Scalar::from(5), Scalar::from(7), Scalar::from(3)],
+        };
+
+        assert_eq!(p1, &p1 + &empty);
+        assert_eq!(p1, empty + &p1);
+        assert_eq!(expected_sum, &p1 + &p2);
+        assert_eq!(expected_sum, &p2 + &p1);
+    }
+
+    #[test]
+    fn public_coefficients_evaluation() {
+        // we use the same values as in polynomial evaluation test
+
+        let g2 = G2Projective::generator();
+
+        // y = 42 (it should be 42 regardless of x)
+        let coeffs = PublicCoefficients {
+            coefficients: vec![g2 * Scalar::from(42)],
+        };
+
+        assert_eq!(g2 * Scalar::from(42), coeffs.evaluate_at(&Scalar::from(1)));
+        assert_eq!(g2 * Scalar::from(42), coeffs.evaluate_at(&Scalar::from(0)));
+        assert_eq!(g2 * Scalar::from(42), coeffs.evaluate_at(&Scalar::from(10)));
+
+        // y = x + 10, at x = 2 (exp: 12)
+        let poly = PublicCoefficients {
+            coefficients: vec![g2 * Scalar::from(10), g2 * Scalar::from(1)],
+        };
+
+        assert_eq!(g2 * Scalar::from(12), poly.evaluate_at(&Scalar::from(2)));
+
+        // y = x^4 - 5x^2 + 2x - 3, at x = 3 (exp: 39)
+        let coeffs = PublicCoefficients {
+            coefficients: vec![
+                (-g2 * Scalar::from(3)),
+                g2 * Scalar::from(2),
+                (-g2 * Scalar::from(5)),
+                G2Projective::identity(),
+                g2 * Scalar::from(1),
+            ],
+        };
+
+        assert_eq!(g2 * Scalar::from(39), coeffs.evaluate_at(&Scalar::from(3)));
+
+        // empty coefficients
+        let coeffs = PublicCoefficients {
+            coefficients: Vec::new(),
+        };
+
+        // should always be 0
+        assert_eq!(
+            G2Projective::identity(),
+            coeffs.evaluate_at(&Scalar::from(1))
+        );
+        assert_eq!(
+            G2Projective::identity(),
+            coeffs.evaluate_at(&Scalar::from(0))
+        );
+        assert_eq!(
+            G2Projective::identity(),
+            coeffs.evaluate_at(&Scalar::from(10))
+        );
+    }
+
+    #[test]
+    fn public_coefficients_roundtrip() {
+        let dummy_seed = [1u8; 32];
+        let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+
+        let good = vec![
+            Polynomial::zero().public_coefficients(),
+            Polynomial::new_random(&mut rng, 0).public_coefficients(),
+            Polynomial::new_random(&mut rng, 1).public_coefficients(),
+            Polynomial::new_random(&mut rng, 4).public_coefficients(),
+            Polynomial::new_random(&mut rng, 15).public_coefficients(),
+        ];
+
+        for coefficient in good {
+            let bytes = coefficient.to_bytes();
+            let recovered = PublicCoefficients::try_from_bytes(&bytes).unwrap();
+            assert_eq!(coefficient, recovered);
+        }
+
+        assert!(PublicCoefficients::try_from_bytes(&[]).is_err());
+        assert!(PublicCoefficients::try_from_bytes(&[1]).is_err());
+        assert!(PublicCoefficients::try_from_bytes(&[1, 2, 3, 4]).is_err());
+
+        let g2 = G2Projective::generator().to_bytes();
+        let mut bad_length = Vec::new();
+        bad_length.extend_from_slice(&2u32.to_be_bytes());
+        bad_length.extend_from_slice(g2.as_ref());
+        assert!(PublicCoefficients::try_from_bytes(&bad_length).is_err());
+
+        let mut incomplete = Vec::new();
+        incomplete.extend_from_slice(&1u32.to_be_bytes());
+        incomplete.extend_from_slice(&g2.as_ref()[..95]);
+        assert!(PublicCoefficients::try_from_bytes(&incomplete).is_err());
+    }
+}

common/crypto/dkg/src/lib.rs

@@ -0,0 +1,95 @@
+// Copyright 2022 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+// forward-secure public key encryption scheme
+pub mod bte;
+pub mod error;
+pub mod interpolation;
+
+// this entire module is a big placeholder for whatever scheme we decide to use for the
+// secure channel encryption scheme, but I would assume that the top-level API would
+// remain more or less the same
+pub mod dealing;
+pub(crate) mod share;
+pub(crate) mod utils;
+
+pub use dealing::*;
+pub use share::*;
+
+// TODO: presumably this should live in a some different, common, crate?
+pub type Threshold = u64;
+pub type NodeIndex = u64;
+
+#[cfg(test)]
+mod tests {
+    use crate::interpolation::perform_lagrangian_interpolation_at_origin;
+    use crate::interpolation::polynomial::Polynomial;
+    use bls12_381::Scalar;
+    use rand_chacha::rand_core::SeedableRng;
+
+    #[test]
+    fn basic_dummy_secret_sharing() {
+        let degree = 2;
+
+        let dummy_seed = [1u8; 32];
+        let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+
+        let p1 = Polynomial::new_random(&mut rng, degree);
+        let p2 = Polynomial::new_random(&mut rng, degree);
+        let p3 = Polynomial::new_random(&mut rng, degree);
+        let p4 = Polynomial::new_random(&mut rng, degree);
+
+        let zero = Scalar::zero();
+        let one = Scalar::one();
+        let two = Scalar::from(2);
+        let three = Scalar::from(3);
+        let four = Scalar::from(4);
+
+        // i.e. given:
+        // p1 = a1 + x * b1 + ...
+        // p2 = a2 + x * b2 + ...
+        // ...
+        // expected = (a1 + a2 + ...) + x * (b1 + b2 + ...) + ...
+        // note: master polynomial is NEVER explicitly computed
+        let expected_master = &p1 + &p2 + &p3 + &p4;
+
+        let v1_secret = p1.evaluate_at(&one)
+            + p2.evaluate_at(&one)
+            + p3.evaluate_at(&one)
+            + p4.evaluate_at(&one);
+        let v2_secret = p1.evaluate_at(&two)
+            + p2.evaluate_at(&two)
+            + p3.evaluate_at(&two)
+            + p4.evaluate_at(&two);
+        let v3_secret = p1.evaluate_at(&three)
+            + p2.evaluate_at(&three)
+            + p3.evaluate_at(&three)
+            + p4.evaluate_at(&three);
+        let v4_secret = p1.evaluate_at(&four)
+            + p2.evaluate_at(&four)
+            + p3.evaluate_at(&four)
+            + p4.evaluate_at(&four);
+
+        // note that the following would have never happened in actual dkg setting, but it's
+        // used here mostly for a sanity check on the maths used
+        let samples = vec![
+            (one, v1_secret),
+            (two, v2_secret),
+            (three, v3_secret),
+            (four, v4_secret),
+        ];
+        let master_secret = perform_lagrangian_interpolation_at_origin(&samples).unwrap();
+
+        assert_eq!(expected_master.evaluate_at(&zero), master_secret);
+        assert_eq!(expected_master.evaluate_at(&one), v1_secret);
+        assert_eq!(expected_master.evaluate_at(&two), v2_secret);
+        assert_eq!(expected_master.evaluate_at(&three), v3_secret);
+        assert_eq!(expected_master.evaluate_at(&four), v4_secret);
+
+        // since we have 4 parties, but polynomials used are of degree 2, we only need at least 3
+        // issuers to contribute
+        let samples2 = vec![(one, v1_secret), (three, v3_secret), (four, v4_secret)];
+        let master_secret2 = perform_lagrangian_interpolation_at_origin(&samples2).unwrap();
+        assert_eq!(master_secret, master_secret2)
+    }
+}

common/crypto/dkg/src/share.rs

@@ -0,0 +1,130 @@
+// Copyright 2022 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use crate::bte::{CHUNK_BYTES, NUM_CHUNKS, SCALAR_SIZE};
+use crate::error::DkgError;
+use crate::interpolation::perform_lagrangian_interpolation_at_origin;
+use crate::NodeIndex;
+use bls12_381::Scalar;
+use zeroize::Zeroize;
+
+// if this type is changed, one must ensure all values can fit in it
+pub type Chunk = u16;
+
+#[derive(PartialEq, Eq, Debug, Zeroize)]
+#[cfg_attr(test, derive(Clone))]
+#[zeroize(drop)]
+pub struct Share(pub(crate) Scalar);
+
+pub fn combine_shares(shares: Vec<Share>, node_indices: &[NodeIndex]) -> Result<Scalar, DkgError> {
+    if shares.len() != node_indices.len() {
+        return Err(DkgError::MismatchedLagrangianSamplesLengths {
+            x: node_indices.len(),
+            y: shares.len(),
+        });
+    }
+
+    let samples = shares
+        .into_iter()
+        .zip(node_indices.iter())
+        .map(|(share, index)| (Scalar::from(*index), share.0))
+        .collect::<Vec<_>>();
+
+    perform_lagrangian_interpolation_at_origin(&samples)
+}
+
+impl Share {
+    // not really used outside tests
+    #[cfg(test)]
+    pub(crate) fn random(mut rng: impl rand_core::RngCore) -> Self {
+        use ff::Field;
+        Share(Scalar::random(&mut rng))
+    }
+
+    pub(crate) fn to_chunks(&self) -> ChunkedShare {
+        let mut chunks = [0; NUM_CHUNKS];
+        let mut bytes = self.0.to_bytes();
+
+        for (chunk, chunk_bytes) in chunks.iter_mut().zip(bytes[..].chunks_exact(CHUNK_BYTES)) {
+            let mut tmp = [0u8; CHUNK_BYTES];
+            tmp.copy_from_slice(chunk_bytes);
+            *chunk = Chunk::from_le_bytes(tmp)
+        }
+
+        bytes.zeroize();
+        ChunkedShare { chunks }
+    }
+
+    pub(crate) fn inner(&self) -> &Scalar {
+        &self.0
+    }
+}
+
+impl From<Scalar> for Share {
+    fn from(s: Scalar) -> Self {
+        Share(s)
+    }
+}
+
+#[derive(Default, Zeroize)]
+#[cfg_attr(test, derive(Clone))]
+#[zeroize(drop)]
+pub(crate) struct ChunkedShare {
+    pub(crate) chunks: [Chunk; NUM_CHUNKS],
+}
+
+impl From<Share> for ChunkedShare {
+    fn from(share: Share) -> ChunkedShare {
+        share.to_chunks()
+    }
+}
+
+impl TryFrom<ChunkedShare> for Share {
+    type Error = DkgError;
+
+    fn try_from(chunked: ChunkedShare) -> Result<Share, Self::Error> {
+        let mut bytes = [0u8; SCALAR_SIZE];
+        for (chunk, chunk_bytes) in chunked
+            .chunks
+            .iter()
+            .zip(bytes[..].chunks_exact_mut(CHUNK_BYTES))
+        {
+            let tmp = chunk.to_le_bytes();
+            chunk_bytes.copy_from_slice(&tmp[..]);
+        }
+
+        let recovered = Option::from(Scalar::from_bytes(&bytes))
+            .map(Share)
+            .ok_or(DkgError::MalformedShare)?;
+
+        bytes.zeroize();
+        Ok(recovered)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::utils::combine_scalar_chunks;
+    use rand_core::SeedableRng;
+
+    #[test]
+    fn chunking_share() {
+        let dummy_seed = [1u8; 32];
+        let mut rng = rand_chacha::ChaCha20Rng::from_seed(dummy_seed);
+
+        let share = Share::random(&mut rng);
+        let chunks: ChunkedShare = share.clone().into();
+
+        let scalar_chunks = chunks
+            .chunks
+            .iter()
+            .map(|c| Scalar::from(*c as u64))
+            .collect::<Vec<_>>();
+        let expected = combine_scalar_chunks(&scalar_chunks);
+        assert_eq!(expected, share.0);
+
+        let recombined: Share = chunks.try_into().unwrap();
+        assert_eq!(expected, recombined.0);
+    }
+}

common/crypto/dkg/src/todos.md

@@ -0,0 +1,4 @@
+Just a todo file to keep track of what should be changed
+
+- Deriving challenges and oracles should be more streamlined; perhaps some trait for hashing
+- perhaps there could be additional intermediate types in proofs of knowledge (for moves / responses / etc)