Data Observatory: add more logging for coingecko API failures

* bump up stats and run prebuild

* fix typos

.dockerignore

@@ -3,4 +3,5 @@
 .gitignore
 **/node_modules
 **/target
+target-otel
 dist

.github/workflows/ci-build-upload-binaries.yml

@@ -3,13 +3,28 @@ name: ci-build-upload-binaries
 on:
   workflow_dispatch:
     inputs:
+      feature_profile:
+        description: "Select a predefined cargo feature profile"
+        required: false
+        default: "none"
+        type: choice
+        options:
+          - none
+          - tokio-console
+          - otel
+          - otel,tokio-console
+      extra_features:
+        description: "Additional comma-separated cargo features (e.g. feat1,feat2)"
+        required: false
+        default: ""
+        type: string
       add_tokio_unstable:
-        description: 'True to add RUSTFLAGS="--cfg tokio_unstable"'
-        required: true
+        description: 'Force RUSTFLAGS="--cfg tokio_unstable" (auto-set when tokio-console is selected)'
+        required: false
         default: false
         type: boolean
       enable_deb:
-        description: "True to enable cargo-deb installation and .deb package building"
+        description: "Enable cargo-deb installation and .deb package building"
         required: false
         default: false
         type: boolean
@@ -21,7 +36,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        platform: [ arc-linux-latest ]
+        platform: [arc-linux-latest]
 
     runs-on: ${{ matrix.platform }}
     env:
@@ -36,38 +51,62 @@ jobs:
           OUTPUT_DIR: ci-builds/${{ github.ref_name }}
         run: |
           rm -rf ci-builds || true
-          mkdir -p $OUTPUT_DIR
-          echo $OUTPUT_DIR
+          mkdir -p "$OUTPUT_DIR"
+          echo "$OUTPUT_DIR"
+
       - name: Install Dependencies (Linux)
         run: sudo apt-get update && sudo apt-get -y install libudev-dev
 
-      - name: Sets env vars for tokio if set in manual dispatch inputs
-        if: github.event_name == 'workflow_dispatch' && inputs.add_tokio_unstable == true
+      - name: Resolve cargo features and RUSTFLAGS
+        if: github.event_name == 'workflow_dispatch'
+        shell: bash
         run: |
-          echo "RUSTFLAGS=--cfg tokio_unstable" >> $GITHUB_ENV
-          echo "CARGO_FEATURES=--features tokio-console" >> $GITHUB_ENV
+          FEATURES=""
+          PROFILE="${{ inputs.feature_profile }}"
+          EXTRA="${{ inputs.extra_features }}"
+
+          if [[ "$PROFILE" != "none" && -n "$PROFILE" ]]; then
+            FEATURES="$PROFILE"
+          fi
+
+          if [[ -n "$EXTRA" ]]; then
+            if [[ -n "$FEATURES" ]]; then
+              FEATURES="${FEATURES},${EXTRA}"
+            else
+              FEATURES="$EXTRA"
+            fi
+          fi
+
+          if [[ -n "$FEATURES" ]]; then
+            echo "CARGO_FEATURES=--features ${FEATURES}" >> "$GITHUB_ENV"
+            echo "::notice::Selected cargo features: $FEATURES"
+          else
+            echo "::notice::No additional cargo features selected"
+          fi
+
+          if [[ "$FEATURES" == *"tokio-console"* ]] || [[ "${{ inputs.add_tokio_unstable }}" == "true" ]]; then
+            echo "RUSTFLAGS=--cfg tokio_unstable" >> "$GITHUB_ENV"
+            echo "::notice::Enabled RUSTFLAGS --cfg tokio_unstable"
+          fi
+
       - name: Install Rust toolchain
-        uses: actions-rs/toolchain@v1
+        uses: dtolnay/rust-toolchain@master
         with:
           toolchain: ${{ vars.REQUIRED_RUSTC_VERSION }}
 
       - name: Build all binaries
-        uses: actions-rs/cargo@v1
-        with:
-          command: build
-          args: --workspace --release ${{ env.CARGO_FEATURES }}
+        shell: bash
+        run: cargo build --workspace --release ${{ env.CARGO_FEATURES }}
 
       - name: Install cargo-deb
-        uses: actions-rs/cargo@v1
-        with:
-          command: install
-          args: cargo-deb
         if: github.event_name == 'workflow_dispatch' && inputs.enable_deb == true
+        shell: bash
+        run: cargo install cargo-deb
 
       - name: Build deb packages
+        if: github.event_name == 'workflow_dispatch' && inputs.enable_deb == true
         shell: bash
         run: make deb
-        if: github.event_name == 'workflow_dispatch' && inputs.enable_deb == true
 
       - name: Upload Artifact
         if: github.event_name == 'workflow_dispatch'
@@ -84,24 +123,22 @@ jobs:
             target/release/nym-node
           retention-days: 30
 
-      # If this was a pull_request or nightly, upload to build server
-
       - name: Prepare build output
-        # if: github.event_name == 'schedule' || github.event_name == 'pull_request'
         shell: bash
         env:
           OUTPUT_DIR: ci-builds/${{ github.ref_name }}
         run: |
-          cp target/release/nym-client $OUTPUT_DIR
-          cp target/release/nym-socks5-client $OUTPUT_DIR
-          cp target/release/nym-api $OUTPUT_DIR
-          cp target/release/nym-network-requester $OUTPUT_DIR
-          cp target/release/nymvisor $OUTPUT_DIR
-          cp target/release/nym-node $OUTPUT_DIR
-          cp target/release/nym-cli $OUTPUT_DIR
-          if [ ${{ github.event_name == 'workflow_dispatch' && inputs.enable_deb == true }} = true ]; then
-            cp target/debian/*.deb $OUTPUT_DIR
+          cp target/release/nym-client "$OUTPUT_DIR"
+          cp target/release/nym-socks5-client "$OUTPUT_DIR"
+          cp target/release/nym-api "$OUTPUT_DIR"
+          cp target/release/nym-network-requester "$OUTPUT_DIR"
+          cp target/release/nymvisor "$OUTPUT_DIR"
+          cp target/release/nym-node "$OUTPUT_DIR"
+          cp target/release/nym-cli "$OUTPUT_DIR"
+          if [[ "${{ github.event_name }}" == "workflow_dispatch" && "${{ inputs.enable_deb }}" == "true" ]]; then
+            cp target/debian/*.deb "$OUTPUT_DIR"
           fi
+
       - name: Deploy branch to CI www
         continue-on-error: true
         uses: easingthemes/ssh-deploy@main

.github/workflows/ci-build.yml

@@ -10,6 +10,7 @@ on:
       - 'nym-api/**'
       - 'nym-authenticator-client/**'
       - 'nym-credential-proxy/**'
+      - 'nym-gateway-probe/**'
       - 'nym-ip-packet-client/**'
       - 'nym-network-monitor/**'
       - 'nym-node/**'
@@ -89,7 +90,7 @@ jobs:
         uses: actions-rs/cargo@v1
         with:
           command: clippy
-          args: --workspace --all-targets --exclude nym-gateway-probe -- -D warnings
+          args: --workspace --all-targets --exclude nym-gateway-probe --exclude nym-node-status-api -- -D warnings
 
       - name: Clippy (non-macos)
         if: contains(matrix.os, 'linux') || contains(matrix.os, 'windows')
@@ -104,6 +105,14 @@ jobs:
         with:
           command: build
 
+        # only build on linux because of wg FFI bindings of its dependency (network probe)
+      - name: Build nym-node-status-api (linux only)
+        if: runner.os == 'Linux'
+        uses: actions-rs/cargo@v1
+        with:
+          command: build
+          args: -p nym-node-status-api
+
       - name: Build all examples
         if: contains(matrix.os, 'linux')
         uses: actions-rs/cargo@v1

.github/workflows/ci-check-ns-api-version.yml

@@ -3,7 +3,7 @@ name: ci-check-ns-api-version
 on:
   pull_request:
     paths:
-      - "nym-node-status-api/**"
+      - "nym-node-status-api/nym-node-status-api/**"
 
 env:
   WORKING_DIRECTORY: "nym-node-status-api/nym-node-status-api"
@@ -16,7 +16,7 @@ jobs:
         uses: actions/checkout@v6
 
       - name: Get version from cargo.toml
-        uses: mikefarah/yq@v4.50.1
+        uses: mikefarah/yq@v4.52.2
         id: get_version
         with:
           cmd: yq -oy '.package.version' ${{ env.WORKING_DIRECTORY }}/Cargo.toml

.github/workflows/ci-check-nym-stats-api-version.yml

@@ -16,7 +16,7 @@ jobs:
         uses: actions/checkout@v6
 
       - name: Get version from cargo.toml
-        uses: mikefarah/yq@v4.50.1
+        uses: mikefarah/yq@v4.52.2
         id: get_version
         with:
           cmd: yq -oy '.package.version' ${{ env.WORKING_DIRECTORY }}/Cargo.toml

.github/workflows/ci-crates-publish-dry-run.yml

@@ -0,0 +1,79 @@
+name: Publish to crates.io (dry run)
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: "Version to publish (e.g. 1.21.0)"
+        required: true
+        type: string
+
+env:
+  CI_BOT_AUTHOR: "Nym bot"
+  CI_BOT_EMAIL: "nym-bot@users.noreply.github.com"
+
+jobs:
+  publish-dry-run:
+    runs-on: arc-linux-latest
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v6
+
+      - name: Configure git identity
+        run: |
+          git config --global user.name "${{ env.CI_BOT_AUTHOR }}"
+          git config --global user.email "${{ env.CI_BOT_EMAIL }}"
+
+      - name: Install rust toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+
+      - name: Install cargo-workspaces
+        run: cargo install cargo-workspaces
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: "20"
+
+      - name: Validate version format
+        run: |
+          if ! npx semver "${{ inputs.version }}"; then
+            echo "Error: '${{ inputs.version }}' is not valid semver"
+            exit 1
+          fi
+
+      - name: Get current version
+        id: current_version
+        run: |
+          VERSION=$(grep -oP '^\s*version\s*=\s*"\K[0-9]+\.[0-9]+\.[0-9]+' Cargo.toml | head -1)
+          echo "version=$VERSION" >> $GITHUB_OUTPUT
+
+      - name: Update workspace dependencies
+        run: |
+          sed -i '/path = /s/version = "${{ steps.current_version.outputs.version }}"/version = "${{ inputs.version }}"/g' Cargo.toml
+
+      - name: Bump versions (local only)
+        run: |
+          cargo workspaces version custom ${{ inputs.version }} \
+            --allow-branch ${{ github.ref_name }} \
+            --no-git-commit \
+
+      # Dry run may show cascading dependency errors because packages aren't
+      # actually uploaded - these are expected and ignored. We check for real
+      # errors like packaging failures, missing metadata, or invalid Cargo.toml.
+      - name: Publish (dry run)
+        run: |
+          output=$(cargo workspaces publish --dry-run --allow-dirty 2>&1) || true
+          echo "$output"
+
+          # Check for real errors (not cascading dependency errors)
+          # Cascading errors mention "crates.io index", real errors mention "Cargo.toml"
+          echo "$output" | grep -i "Cargo.toml" && exit 1 || true
+
+      # Show the list of packages published
+      - name: Show package versions
+        run: cargo workspaces list --long

.github/workflows/ci-crates-publish-resume.yml

@@ -0,0 +1,59 @@
+# This is in case, for whatever reason, a publication run fails, and we need to restart halfway down the list, of unbumped/unpublished crates.
+name: Resume crates.io publish
+
+on:
+  workflow_dispatch:
+    inputs:
+      resume_after:
+        description: "Last successfully published crate (will start from the next one)"
+        required: true
+        type: string
+      publish_interval:
+        description: "Seconds to wait between publishes"
+        required: false
+        default: "600"
+        type: string
+
+jobs:
+  publish:
+    runs-on: arc-linux-latest
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v6
+
+      - name: Install rust toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+
+      - name: Install cargo-workspaces
+        run: cargo install cargo-workspaces
+
+      # Get crates in publish order, skip up to and including resume_after
+      - name: Publish remaining crates
+        env:
+          CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}
+        run: |
+          CRATES=$(cargo workspaces plan 2>/dev/null | sed -n '/^${{ inputs.resume_after }}$/,$p' | tail -n +2)
+
+          if [ -z "$CRATES" ]; then
+            echo "Error: No crates found after '${{ inputs.resume_after }}'"
+            echo "Check the crate name matches exactly from 'cargo workspaces plan'"
+            exit 1
+          fi
+
+          echo "Will publish the following crates:"
+          echo "$CRATES"
+          echo ""
+
+          echo "$CRATES" | while read crate; do
+            echo "Publishing $crate..."
+            cargo publish -p "$crate" --allow-dirty
+            echo "Waiting ${{ inputs.publish_interval }}s before next publish..."
+            sleep ${{ inputs.publish_interval }}
+          done
+
+      - name: Show package versions
+        run: cargo workspaces list --long

.github/workflows/ci-crates-publish.yml

@@ -0,0 +1,86 @@
+name: Publish crates to crates.io
+
+on:
+  workflow_dispatch:
+    inputs:
+      publish_interval:
+        description: "Seconds to wait between publishes (600 for first publish, 60 after)"
+        required: false
+        default: "600"
+        type: string
+      backup_author:
+        description: "Second team member added as owner of the crate"
+        required: false
+        default: "jstuczyn"
+        type: string
+
+jobs:
+  publish:
+    runs-on: arc-linux-latest
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v6
+
+      - name: Install rust toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+
+      - name: Install cargo-workspaces
+        run: cargo install cargo-workspaces
+
+      # `--publish-as-is` skips version bumping since that's done in a separate CI job.
+      - name: Publish
+        env:
+          CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}
+        run: |
+          cargo workspaces publish \
+            --publish-as-is \
+            --publish-interval ${{ inputs.publish_interval }}
+
+      - name: Show package versions
+        run: cargo workspaces list --long
+
+      - name: Add team as crate owners
+        env:
+          CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}
+        run: |
+          TEAM="github:nymtech:core"
+          echo "Checking and adding $TEAM as owner to workspace crates..."
+
+          cargo workspaces list | while read crate; do
+            echo "Checking $crate..."
+
+            if cargo owner --list "$crate" 2>/dev/null | grep -q "$TEAM"; then
+              echo "  $TEAM already owns $crate, skipping"
+            else
+              echo "  Adding $TEAM as owner of $crate..."
+              cargo owner --add "$TEAM" "$crate"
+              sleep 2
+            fi
+          done
+
+          echo "Done!"
+
+      - name: Add secondary member as crate owner
+        env:
+          CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}
+        run: |
+          TEAM_MEMBER="${{ inputs.backup_author }}"
+          echo "Checking and adding $TEAM_MEMBER as owner to workspace crates..."
+
+          cargo workspaces list | while read crate; do
+            echo "Checking $crate..."
+
+            if cargo owner --list "$crate" 2>/dev/null | grep -q "$TEAM_MEMBER"; then
+              echo "  $TEAM_MEMBER already owns $crate, skipping"
+            else
+              echo "  Adding $TEAM_MEMBER as owner of $crate..."
+              cargo owner --add "$TEAM_MEMBER" "$crate"
+              sleep 2
+            fi
+          done
+
+          echo "Done!"

.github/workflows/ci-crates-version-bump.yml

@@ -0,0 +1,74 @@
+name: Bump crate versions
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: "Version to set (e.g. 1.21.0)"
+        required: true
+        type: string
+
+env:
+  CI_BOT_AUTHOR: "Nym bot"
+  CI_BOT_EMAIL: "nym-bot@users.noreply.github.com"
+
+jobs:
+  version-bump:
+    runs-on: arc-linux-latest
+    permissions:
+      contents: write
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v6
+
+      - name: Configure git identity
+        run: |
+          git config --global user.name "${{ env.CI_BOT_AUTHOR }}"
+          git config --global user.email "${{ env.CI_BOT_EMAIL }}"
+
+      - name: Install rust toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+
+      - name: Install cargo-workspaces
+        run: cargo install cargo-workspaces
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: "20"
+
+      - name: Validate version format
+        run: |
+          if ! npx semver "${{ inputs.version }}"; then
+            echo "Error: '${{ inputs.version }}' is not valid semver"
+            exit 1
+          fi
+
+      - name: Get current version
+        id: current_version
+        run: |
+          VERSION=$(grep -oP '^\s*version\s*=\s*"\K[0-9]+\.[0-9]+\.[0-9]+' Cargo.toml | head -1)
+          echo "version=$VERSION" >> $GITHUB_OUTPUT
+
+      - name: Update workspace dependencies
+        run: |
+          sed -i '/path = /s/version = "${{ steps.current_version.outputs.version }}"/version = "${{ inputs.version }}"/g' Cargo.toml
+
+      - name: Bump versions
+        run: |
+          cargo workspaces version custom ${{ inputs.version }} \
+            --no-git-commit \
+            --yes
+
+      - name: Commit and push version bump
+        run: |
+          git add -A
+          git commit -m "crates release: bump version to ${{ inputs.version }}"
+          git push
+
+      - name: Show package versions
+        run: cargo workspaces list --long

.github/workflows/ci-docs-linkcheck.yml

@@ -0,0 +1,21 @@
+name: ci-docs-linkcheck
+
+on:
+  workflow_dispatch:
+  push:
+    paths:
+      - "documentation/docs/**"
+      - ".github/workflows/ci-docs-linkcheck.yml"
+      - "lychee.toml"
+
+jobs:
+  linkcheck:
+    runs-on: arc-linux-latest
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Check links
+        uses: lycheeverse/lychee-action@v2
+        with:
+          args: ${{ github.workspace }}/documentation/docs/ --config ${{ github.workspace }}/lychee.toml --root-dir ${{ github.workspace }}/documentation/docs/pages/
+          fail: true

.github/workflows/publish-crates-io-dry-run.yml

@@ -1,43 +0,0 @@
-name: Publish to crates.io (dry run)
-
-on:
-  workflow_dispatch:
-    inputs:
-      version:
-        description: "Version to publish (e.g. 1.21.0)"
-        required: true
-        type: string
-
-jobs:
-  publish-dry-run:
-    runs-on: arc-ubuntu-22.04-dind
-    steps:
-      - name: Checkout repo
-        uses: actions/checkout@v6
-
-      - name: Install rust toolchain
-        uses: actions-rs/toolchain@v1
-        with:
-          profile: minimal
-          toolchain: stable
-          override: true
-
-      - name: Install cargo-workspaces
-        run: cargo install cargo-workspaces
-
-      - name: Bump versions (local only)
-        run: |
-          cargo workspaces version ${{ inputs.version }} \
-            --no-git-commit \
-            --no-git-tag \
-            --no-git-push \
-            --yes
-
-      # Note: Dry run may show cascading dependency errors because packages
-      # aren't actually uploaded. Check if the missing dependency has an
-      # "aborting upload due to dry run" message earlier in the output - if so,
-      # it would succeed in a real publish since cargo-workspaces publishes in
-      # dependency order. cargo-workspaces doesn't fail on err, so there isn't
-      # a good way to check this at the moment.
-      - name: Publish (dry run)
-        run: cargo workspaces publish --from-git --dry-run --allow-dirty

.github/workflows/publish-crates-io.yml

@@ -1,47 +0,0 @@
-name: Publish to crates.io
-
-on:
-  workflow_dispatch:
-    inputs:
-      version:
-        description: "Version to publish (e.g. 1.21.0)"
-        required: true
-        type: string
-
-jobs:
-  publish:
-    runs-on: arc-ubuntu-22.04-dind
-    steps:
-      - name: Checkout repo
-        uses: actions/checkout@v6
-
-      - name: Install rust toolchain
-        uses: actions-rs/toolchain@v1
-        with:
-          profile: minimal
-          toolchain: stable
-          override: true
-
-      - name: Install cargo-workspaces
-        run: cargo install cargo-workspaces
-
-      # - name: Configure git
-      #   run: |
-      #     git config user.name "github-actions[bot]"
-      #     git config user.email "github-actions[bot]@users.noreply.github.com"
-
-      - name: Bump versions
-        run: |
-          cargo workspaces version ${{ inputs.version }} \
-            --no-git-push \
-            --no-git-tag \
-            --yes
-
-      - name: Publish
-        env:
-          CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}
-        run: cargo workspaces publish --from-git --no-git-commit
-
-      # - name: Push version commit
-      #   run: |
-      #     git push origin HEAD

.github/workflows/push-credential-proxy.yaml

@@ -26,7 +26,7 @@ jobs:
           git config --global user.name "Lawrence Stalder"
 
       - name: Get version from cargo.toml
-        uses: mikefarah/yq@v4.50.1
+        uses: mikefarah/yq@v4.52.2
         id: get_version
         with:
           cmd: yq -oy '.package.version' ${{ env.WORKING_DIRECTORY }}/nym-credential-proxy/Cargo.toml

.github/workflows/push-data-observatory.yaml

@@ -26,7 +26,7 @@ jobs:
           git config --global user.name "Lawrence Stalder"
 
       - name: Get version from cargo.toml
-        uses: mikefarah/yq@v4.50.1
+        uses: mikefarah/yq@v4.52.2
         id: get_version
         with:
           cmd: yq -oy '.package.version' ${{ env.WORKING_DIRECTORY }}/Cargo.toml

.github/workflows/push-network-monitor.yaml

@@ -26,7 +26,7 @@ jobs:
           git config --global user.name "Lawrence Stalder"
 
       - name: Get version from cargo.toml
-        uses: mikefarah/yq@v4.50.1
+        uses: mikefarah/yq@v4.52.2
         id: get_version
         with:
           cmd: yq -oy '.package.version' ${{ env.WORKING_DIRECTORY }}/nym-network-monitor/Cargo.toml

.github/workflows/push-nym-api.yaml

@@ -26,7 +26,7 @@ jobs:
           git config --global user.name "Lawrence Stalder"
 
       - name: Get version from cargo.toml
-        uses: mikefarah/yq@v4.50.1
+        uses: mikefarah/yq@v4.52.2
         id: get_version
         with:
           cmd: yq -oy '.package.version' ${{ env.WORKING_DIRECTORY }}/nym-api/Cargo.toml

.github/workflows/push-nym-node.yaml

@@ -26,7 +26,7 @@ jobs:
           git config --global user.name "Lawrence Stalder"
 
       - name: Get version from cargo.toml
-        uses: mikefarah/yq@v4.50.1
+        uses: mikefarah/yq@v4.52.2
         id: get_version
         with:
           cmd: yq -oy '.package.version' ${{ env.WORKING_DIRECTORY }}/Cargo.toml

.github/workflows/push-nym-statistics-api.yaml

@@ -26,7 +26,7 @@ jobs:
           git config --global user.name "Lawrence Stalder"
 
       - name: Get version from cargo.toml
-        uses: mikefarah/yq@v4.50.1
+        uses: mikefarah/yq@v4.52.2
         id: get_version
         with:
           cmd: yq -oy '.package.version' ${{ env.WORKING_DIRECTORY }}/Cargo.toml

.github/workflows/push-nyx-chain-watcher.yaml

@@ -8,7 +8,7 @@ env:
 
 jobs:
   build-container:
-    runs-on: arc-ubuntu-22.04-dind
+    runs-on: ubuntu-latest
     steps:
       - name: Login to Harbor
         uses: docker/login-action@v3
@@ -26,7 +26,7 @@ jobs:
           git config --global user.name "Lawrence Stalder"
 
       - name: Get version from cargo.toml
-        uses: mikefarah/yq@v4.50.1
+        uses: mikefarah/yq@v4.52.2
         id: get_version
         with:
           cmd: yq -oy '.package.version' ${{ env.WORKING_DIRECTORY }}/Cargo.toml

.github/workflows/push-validator-rewarder.yaml

@@ -26,7 +26,7 @@ jobs:
           git config --global user.name "Lawrence Stalder"
 
       - name: Get version from cargo.toml
-        uses: mikefarah/yq@v4.50.1
+        uses: mikefarah/yq@v4.52.2
         id: get_version
         with:
           cmd: yq -oy '.package.version' ${{ env.WORKING_DIRECTORY }}/Cargo.toml

.github/workflows/resume-publish-crates-io.yml

@@ -0,0 +1,41 @@
+name: Resume publish to crates.io
+
+on:
+  workflow_dispatch:
+    inputs:
+      resume_after:
+        description: "Last successfully published crate (will start from the next one)"
+        required: true
+        type: string
+
+jobs:
+  publish:
+    runs-on: arc-linux-latest
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v6
+
+      - name: Install rust toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+
+      - name: Install cargo-workspaces
+        run: cargo install cargo-workspaces
+
+      - name: Publish remaining crates
+        env:
+          CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}
+        run: |
+          # Get crates in publish order, skip up to and including resume_after
+          cargo workspaces plan 2>/dev/null | sed -n '/^${{ inputs.resume_after }}$/,$p' | tail -n +2 | while read crate; do
+            echo "Publishing $crate..."
+            cargo publish -p "$crate" --allow-dirty
+            echo "Waiting 600s before next publish..."
+            sleep 600
+          done
+
+      - name: Show package versions
+        run: cargo workspaces list --long

.gitignore

@@ -67,7 +67,6 @@ nym-api/redocly/formatted-openapi.json
 *.profraw
 .beads
 CLAUDE.md
-docs
 .claude
 .superego
 
@@ -77,3 +76,4 @@ docs
 .claude/settings.json
 
 /notes
+/target-otel

CHANGELOG.md

@@ -4,6 +4,168 @@ Post 1.0.0 release, the changelog format is based on [Keep a Changelog](https://
 
 ## [Unreleased]
 
+## [2026.3-parmigiano] (2026-02-10)
+
+- chore: disable LP on parmigiano branch ([#6422])
+- revert mixnet-based client fautly changes from LP ([#6420])
+- [LP fix] Registration client with fallback ([#6419])
+- Lp/ip pool fixes ([#6412])
+- [LP-fix] expose wg psk for the vpn-client ([#6411])
+- LP-fix : configurable LP timeouts ([#6409])
+- LP-fix : add LP x25519 key to the description ([#6408])
+- use rng that is Send ([#6404])
+- use local kem key instead of local x25519 ([#6402])
+- [LP Gateway Probe] CLI and behavior improvements  ([#6400])
+- lp: attempt to negotiate (and use) protocol version ([#6399])
+- bugfix: use correct reserved bytes when parsing LpHeader ([#6398])
+- Lp/bugfix/share ip allocation ([#6395])
+- feat: use hex-encoding for lp key digests ([#6394])
+- Add socks5 test to gateway-probe ([#6393])
+- [LP Gateway probe] Improve file structure ([#6391])
+- Reduce the size of `HttpClientError` ([#6390])
+- Lp/two step dvpn reg ([#6386])
+- Add extra configured nym api url to env ([#6382])
+- Lp/dvpn psk injection ([#6378])
+- LP: include signing key digests to LP responses ([#6373])
+- Lp/use noise x25519 ([#6372])
+- Topology fallback ([#6363])
+- NS API socks5 support ([#6361])
+- LP: modified LPRemotePeer to dynamically choose required KEM key hash ([#6358])
+- Fix KKT Integration into LP ([#6357])
+- LP: mixnet reg fixes ([#6356])
+- LP: announced KEM key hashes ([#6349])
+- revert faulty drop changes ([#6346])
+- small qol changes ([#6340])
+- Apply configured api urls via env ([#6337])
+- lp chore: make sure to take reserved bytes straight from the header ([#6336])
+- LP: x25519/ed22519 cleanup round ([#6335])
+- Lp/encrypted kkt ([#6331])
+- ensure packets with incompatible versions are rejected ([#6326])
+- standarise lp serialisation: ([#6324])
+- Upgrade to def_guard_wireguard v0.8.0 ([#6315])
+- Max/crates io prep v2 ([#6270])
+
+[#6422]: https://github.com/nymtech/nym/pull/6422
+[#6420]: https://github.com/nymtech/nym/pull/6420
+[#6419]: https://github.com/nymtech/nym/pull/6419
+[#6412]: https://github.com/nymtech/nym/pull/6412
+[#6411]: https://github.com/nymtech/nym/pull/6411
+[#6409]: https://github.com/nymtech/nym/pull/6409
+[#6408]: https://github.com/nymtech/nym/pull/6408
+[#6404]: https://github.com/nymtech/nym/pull/6404
+[#6402]: https://github.com/nymtech/nym/pull/6402
+[#6400]: https://github.com/nymtech/nym/pull/6400
+[#6399]: https://github.com/nymtech/nym/pull/6399
+[#6398]: https://github.com/nymtech/nym/pull/6398
+[#6395]: https://github.com/nymtech/nym/pull/6395
+[#6394]: https://github.com/nymtech/nym/pull/6394
+[#6393]: https://github.com/nymtech/nym/pull/6393
+[#6391]: https://github.com/nymtech/nym/pull/6391
+[#6390]: https://github.com/nymtech/nym/pull/6390
+[#6386]: https://github.com/nymtech/nym/pull/6386
+[#6382]: https://github.com/nymtech/nym/pull/6382
+[#6378]: https://github.com/nymtech/nym/pull/6378
+[#6373]: https://github.com/nymtech/nym/pull/6373
+[#6372]: https://github.com/nymtech/nym/pull/6372
+[#6363]: https://github.com/nymtech/nym/pull/6363
+[#6361]: https://github.com/nymtech/nym/pull/6361
+[#6358]: https://github.com/nymtech/nym/pull/6358
+[#6357]: https://github.com/nymtech/nym/pull/6357
+[#6356]: https://github.com/nymtech/nym/pull/6356
+[#6349]: https://github.com/nymtech/nym/pull/6349
+[#6346]: https://github.com/nymtech/nym/pull/6346
+[#6340]: https://github.com/nymtech/nym/pull/6340
+[#6337]: https://github.com/nymtech/nym/pull/6337
+[#6336]: https://github.com/nymtech/nym/pull/6336
+[#6335]: https://github.com/nymtech/nym/pull/6335
+[#6331]: https://github.com/nymtech/nym/pull/6331
+[#6326]: https://github.com/nymtech/nym/pull/6326
+[#6324]: https://github.com/nymtech/nym/pull/6324
+[#6315]: https://github.com/nymtech/nym/pull/6315
+[#6270]: https://github.com/nymtech/nym/pull/6270
+
+## [2026.2-oscypek] (2026-01-27)
+
+- bugfix: downgrade gateway protocol to clients proposed version ([#6377])
+- bugfix: ack fix ([#6364])
+- Cherry pick/api urls oscypek ([#6348])
+- Update nix to v0.30.1 ([#6316])
+- Deriving Serialize for GatewayData ([#6314])
+- chore: remove repetitive words in comment ([#6313])
+- [bugfix] Sqlite transaction escalation was causing errors  ([#6299])
+- DNS static table pre-resolve ([#6297])
+- Add Copy+Clone to nym_api_provider::Config ([#6296])
+- [chore] clippy fixes and use fixed rust version from REQUIRED_RUSTC_VERSION ([#6295])
+- build(deps): bump SonarSource/sonarqube-scan-action from 6 to 7 ([#6294])
+- build(deps): bump mikefarah/yq from 4.49.2 to 4.50.1 ([#6293])
+- build(deps): bump actions/upload-artifact from 5 to 6 ([#6292])
+- build(deps): bump actions/download-artifact from 6 to 7 ([#6291])
+- build(deps): bump js-yaml from 3.14.1 to 3.14.2 in /documentation/docs ([#6290])
+- build(deps): bump next from 15.4.9 to 15.4.10 in /nym-node-status-api/nym-node-status-ui ([#6289])
+- build(deps): bump next from 14.2.33 to 14.2.35 ([#6288])
+- LP Registration + Telescoping + Gateway Probe Localnet Mode ([#6286])
+- build(deps): bump next from 15.5.7 to 15.5.9 in /documentation/docs ([#6285])
+- build(deps): bump next from 15.4.7 to 15.4.9 in /nym-node-status-api/nym-node-status-ui ([#6284])
+- Minor DNS improvements ([#6283])
+- HTTP client without default features ([#6281])
+- DNS: reduce number of attempts ([#6278])
+- [bugfix] use proper mixing delay instead of poisson delay in cover traffic ([#6269])
+- build(deps): bump node-forge from 1.3.1 to 1.3.3 in /wasm/zknym-lib/internal-dev ([#6261])
+- build(deps-dev): bump node-forge from 1.3.1 to 1.3.3 in /wasm/mix-fetch/internal-dev ([#6260])
+- build(deps-dev): bump node-forge from 1.3.1 to 1.3.2 in /wasm/client/internal-dev ([#6251])
+- build(deps): bump node-forge from 1.3.1 to 1.3.2 in /nym-credential-proxy/vpn-api-lib-wasm/internal-dev ([#6250])
+- [Feature] Fallback gateway listener and remove legacy key support ([#6249])
+- build(deps-dev): bump node-forge from 1.3.0 to 1.3.2 in /clients/native/examples/js-examples/websocket ([#6248])
+- build(deps): bump node-forge from 1.3.1 to 1.3.2 ([#6246])
+- build(deps): bump pnpm/action-setup from 4.1.0 to 4.2.0 ([#6245])
+- build(deps): bump actions/download-artifact from 5 to 6 ([#6244])
+- build(deps): bump actions/checkout from 4 to 6 ([#6243])
+- build(deps): bump mikefarah/yq from 4.48.1 to 4.49.2 ([#6242])
+- build(deps): bump actions/upload-artifact from 4 to 5 ([#6241])
+- fix: fix assertion ([#6238])
+- Initial changes to support extra configurable parameters and to print… ([#6237])
+- Data Observatory ([#6172])
+
+[#6377]: https://github.com/nymtech/nym/pull/6377
+[#6364]: https://github.com/nymtech/nym/pull/6364
+[#6348]: https://github.com/nymtech/nym/pull/6348
+[#6316]: https://github.com/nymtech/nym/pull/6316
+[#6314]: https://github.com/nymtech/nym/pull/6314
+[#6313]: https://github.com/nymtech/nym/pull/6313
+[#6299]: https://github.com/nymtech/nym/pull/6299
+[#6297]: https://github.com/nymtech/nym/pull/6297
+[#6296]: https://github.com/nymtech/nym/pull/6296
+[#6295]: https://github.com/nymtech/nym/pull/6295
+[#6294]: https://github.com/nymtech/nym/pull/6294
+[#6293]: https://github.com/nymtech/nym/pull/6293
+[#6292]: https://github.com/nymtech/nym/pull/6292
+[#6291]: https://github.com/nymtech/nym/pull/6291
+[#6290]: https://github.com/nymtech/nym/pull/6290
+[#6289]: https://github.com/nymtech/nym/pull/6289
+[#6288]: https://github.com/nymtech/nym/pull/6288
+[#6286]: https://github.com/nymtech/nym/pull/6286
+[#6285]: https://github.com/nymtech/nym/pull/6285
+[#6284]: https://github.com/nymtech/nym/pull/6284
+[#6283]: https://github.com/nymtech/nym/pull/6283
+[#6281]: https://github.com/nymtech/nym/pull/6281
+[#6278]: https://github.com/nymtech/nym/pull/6278
+[#6269]: https://github.com/nymtech/nym/pull/6269
+[#6261]: https://github.com/nymtech/nym/pull/6261
+[#6260]: https://github.com/nymtech/nym/pull/6260
+[#6251]: https://github.com/nymtech/nym/pull/6251
+[#6250]: https://github.com/nymtech/nym/pull/6250
+[#6249]: https://github.com/nymtech/nym/pull/6249
+[#6248]: https://github.com/nymtech/nym/pull/6248
+[#6246]: https://github.com/nymtech/nym/pull/6246
+[#6245]: https://github.com/nymtech/nym/pull/6245
+[#6244]: https://github.com/nymtech/nym/pull/6244
+[#6243]: https://github.com/nymtech/nym/pull/6243
+[#6242]: https://github.com/nymtech/nym/pull/6242
+[#6241]: https://github.com/nymtech/nym/pull/6241
+[#6238]: https://github.com/nymtech/nym/pull/6238
+[#6237]: https://github.com/nymtech/nym/pull/6237
+[#6172]: https://github.com/nymtech/nym/pull/6172
+
 ## [2026.1-niolo] (2026-01-13)
 
 - bugfix: mozzarella -> niolo config migration ([#6259])

Cargo.toml

@@ -174,7 +174,7 @@ members = [
     "wasm/node-tester",
     "wasm/zknym-lib",
     "nym-gateway-probe",
-    "integration-tests", "common/nym-lp-transport",
+    "integration-tests", "common/nym-lp-transport", "common/nym-kkt-ciphersuite",
 ]
 
 default-members = [
@@ -185,7 +185,6 @@ default-members = [
     "nym-credential-proxy/nym-credential-proxy",
     "nym-node",
     "nym-node-status-api/nym-node-status-agent",
-    "nym-node-status-api/nym-node-status-api",
     "nym-statistics-api",
     "nym-validator-rewarder",
     "nyx-chain-watcher",
@@ -206,7 +205,7 @@ edition = "2024"
 license = "Apache-2.0"
 rust-version = "1.85"
 readme = "README.md"
-version = "1.20.1"
+version = "1.20.4"
 
 [workspace.dependencies]
 addr = "0.15.6"
@@ -233,7 +232,7 @@ blake3 = "1.7.0"
 bloomfilter = "3.0.1"
 bs58 = "0.5.1"
 bytecodec = "0.4.15"
-bytes = "1.10.1"
+bytes = "1.11.1"
 cargo_metadata = "0.19.2"
 celes = "2.6.0"
 cfg-if = "1.0.0"
@@ -304,13 +303,16 @@ ledger-transport = "0.10.0"
 ledger-transport-hid = "0.10.0"
 log = "0.4"
 mime = "0.3.17"
+mock_instant = "0.6.0"
 moka = { version = "0.12", features = ["future"] }
 nix = "0.30.1"
 notify = "5.1.0"
 num_enum = "0.7.5"
 once_cell = "1.21.3"
-opentelemetry = "0.19.0"
-opentelemetry-jaeger = "0.18.0"
+opentelemetry = "0.31.0"
+opentelemetry_sdk = "0.31.0"
+opentelemetry-otlp = "0.31.0"
+tonic = "0.14.4"
 parking_lot = "0.12.3"
 pem = "0.8"
 petgraph = "0.6.5"
@@ -320,12 +322,13 @@ publicsuffix = "2.3.0"
 proc_pidinfo = "0.1.3"
 quote = "1"
 rand = "0.8.5"
+rand09 = { package = "rand", version = "=0.9.2" }
 rand_chacha = "0.3"
 rand_core = "0.6.3"
 rand_distr = "0.4"
 rayon = "1.5.1"
 regex = "1.10.6"
-reqwest = { version = "0.12.15", default-features = false }
+reqwest = { version = "0.13.1", default-features = false }
 rs_merkle = "1.5.0"
 schemars = "0.8.22"
 semver = "1.0.26"
@@ -367,9 +370,8 @@ tower = "0.5.2"
 tower-http = "0.6.6"
 tracing = "0.1.41"
 tracing-log = "0.2"
-tracing-opentelemetry = "0.19.0"
+tracing-opentelemetry = "0.32.1"
 tracing-subscriber = "0.3.20"
-tracing-tree = "0.2.2"
 tracing-indicatif = "0.3.9"
 tracing-test = "0.2.5"
 ts-rs = "10.1.0"
@@ -381,7 +383,7 @@ url = "2.5"
 utoipa = "5.2"
 utoipa-swagger-ui = "8.1"
 utoipauto = "0.2"
-uuid = "*"
+uuid = "1.19.0"
 vergen = { version = "=8.3.1", default-features = false }
 vergen-gitcl = { version = "1.0.8", default-features = false }
 walkdir = "2"
@@ -391,105 +393,106 @@ zeroize = "1.7.0"
 prometheus = { version = "0.14.0" }
 
 # Workspace dep definitions required by crates.io publication - we need a workspace version since `cargo workspaces` doesn't work with path imports from crate manifests
-nym-api-requests = { version = "1.20.1", path = "nym-api/nym-api-requests" }
-nym-authenticator-requests = { version = "1.20.1", path = "common/authenticator-requests" }
-nym-async-file-watcher = { version = "1.20.1", path = "common/async-file-watcher" }
-nym-authenticator-client = { version = "1.20.1", path = "nym-authenticator-client" }
-nym-bandwidth-controller = { version = "1.20.1", path = "common/bandwidth-controller" }
-nym-bin-common = { version = "1.20.1", path = "common/bin-common" }
-nym-cache = { version = "1.20.1", path = "common/nym-cache" }
-nym-client-core = { version = "1.20.1", path = "common/client-core", default-features = false }
-nym-client-core-config-types = { version = "1.20.1", path = "common/client-core/config-types" }
-nym-client-core-gateways-storage = { version = "1.20.1", path = "common/client-core/gateways-storage" }
-nym-client-core-surb-storage = { version = "1.20.1", path = "common/client-core/surb-storage" }
-nym-client-websocket-requests = { version = "1.20.1", path = "clients/native/websocket-requests" }
-nym-common = { version = "1.20.1", path = "common/nym-common" }
-nym-compact-ecash = { version = "1.20.1", path = "common/nym_offline_compact_ecash" }
-nym-config = { version = "1.20.1", path = "common/config" }
-nym-contracts-common = { version = "1.20.1", path = "common/cosmwasm-smart-contracts/contracts-common" }
-nym-coconut-dkg-common = { version = "1.20.1", path = "common/cosmwasm-smart-contracts/coconut-dkg" }
-nym-credential-storage = { version = "1.20.1", path = "common/credential-storage" }
-nym-credential-utils = { version = "1.20.1", path = "common/credential-utils" }
-nym-credential-proxy-lib = { version = "1.20.1", path = "common/credential-proxy" }
-nym-credentials = { version = "1.20.1", path = "common/credentials", default-features = false }
-nym-credentials-interface = { version = "1.20.1", path = "common/credentials-interface" }
-nym-credential-proxy-requests = { version = "1.20.1", path = "nym-credential-proxy/nym-credential-proxy-requests", default-features = false }
-nym-credential-verification = { version = "1.20.1", path = "common/credential-verification" }
-nym-crypto = { version = "1.20.1", path = "common/crypto", default-features = false }
-nym-dkg = { version = "1.20.1", path = "common/dkg" }
-nym-ecash-contract-common = { version = "1.20.1", path = "common/cosmwasm-smart-contracts/ecash-contract" }
-nym-ecash-signer-check = { version = "1.20.1", path = "common/ecash-signer-check" }
-nym-ecash-signer-check-types = { version = "1.20.1", path = "common/ecash-signer-check-types" }
-nym-ecash-time = { version = "1.20.1", path = "common/ecash-time" }
-nym-exit-policy = { version = "1.20.1", path = "common/exit-policy" }
-nym-ffi-shared = { version = "1.20.1", path = "sdk/ffi/shared" }
-nym-gateway-client = { version = "1.20.1", path = "common/client-libs/gateway-client", default-features = false }
-nym-gateway-requests = { version = "1.20.1", path = "common/gateway-requests" }
-nym-gateway-storage = { version = "1.20.1", path = "common/gateway-storage" }
-nym-gateway-stats-storage = { version = "1.20.1", path = "common/gateway-stats-storage" }
-nym-group-contract-common = { version = "1.20.1", path = "common/cosmwasm-smart-contracts/group-contract" }
-nym-http-api-client = { version = "1.20.1", path = "common/http-api-client" }
-nym-http-api-client-macro = { version = "1.20.1", path = "common/http-api-client-macro" }
-nym-http-api-common = { version = "1.20.1", path = "common/http-api-common", default-features = false }
-nym-id = { version = "1.20.1", path = "common/nym-id" }
-nym-ip-packet-client = { version = "1.20.1", path = "nym-ip-packet-client" }
-nym-ip-packet-requests = { version = "1.20.1", path = "common/ip-packet-requests" }
-nym-metrics = { version = "1.20.1", path = "common/nym-metrics" }
-nym-mixnet-client = { version = "1.20.1", path = "common/client-libs/mixnet-client" }
-nym-mixnet-contract-common = { version = "1.20.1", path = "common/cosmwasm-smart-contracts/mixnet-contract" }
-nym-multisig-contract-common = { version = "1.20.1", path = "common/cosmwasm-smart-contracts/multisig-contract" }
-nym-network-defaults = { version = "1.20.1", path = "common/network-defaults" }
-nym-node-tester-utils = { version = "1.20.1", path = "common/node-tester-utils" }
-nym-noise = { version = "1.20.1", path = "common/nymnoise" }
-nym-noise-keys = { version = "1.20.1", path = "common/nymnoise/keys" }
-nym-nonexhaustive-delayqueue = { version = "1.20.1", path = "common/nonexhaustive-delayqueue" }
-nym-node-requests = { version = "1.20.1", path = "nym-node/nym-node-requests", default-features = false }
-nym-node-metrics = { version = "1.20.1", path = "nym-node/nym-node-metrics" }
-nym-ordered-buffer = { version = "1.20.1", path = "common/socks5/ordered-buffer" }
-nym-outfox = { version = "1.20.1", path = "nym-outfox" }
-nym-registration-common = { version = "1.20.1", path = "common/registration" }
-nym-pemstore = { version = "1.20.1", path = "common/pemstore" }
-nym-performance-contract-common = { version = "1.20.1", path = "common/cosmwasm-smart-contracts/nym-performance-contract" }
-nym-sdk = { version = "1.20.1", path = "sdk/rust/nym-sdk" }
-nym-serde-helpers = { version = "1.20.1", path = "common/serde-helpers" }
-nym-service-providers-common = { version = "1.20.1", path = "service-providers/common" }
-nym-service-provider-requests-common = { version = "1.20.1", path = "common/service-provider-requests-common" }
-nym-socks5-client-core = { version = "1.20.1", path = "common/socks5-client-core" }
-nym-socks5-proxy-helpers = { version = "1.20.1", path = "common/socks5/proxy-helpers" }
-nym-socks5-requests = { version = "1.20.1", path = "common/socks5/requests" }
-nym-sphinx = { version = "1.20.1", path = "common/nymsphinx" }
-nym-sphinx-acknowledgements = { version = "1.20.1", path = "common/nymsphinx/acknowledgements" }
-nym-sphinx-addressing = { version = "1.20.1", path = "common/nymsphinx/addressing" }
-nym-sphinx-anonymous-replies = { version = "1.20.1", path = "common/nymsphinx/anonymous-replies" }
-nym-sphinx-chunking = { version = "1.20.1", path = "common/nymsphinx/chunking" }
-nym-sphinx-cover = { version = "1.20.1", path = "common/nymsphinx/cover" }
-nym-sphinx-forwarding = { version = "1.20.1", path = "common/nymsphinx/forwarding" }
-nym-sphinx-framing = { version = "1.20.1", path = "common/nymsphinx/framing" }
-nym-sphinx-params = { version = "1.20.1", path = "common/nymsphinx/params" }
-nym-sphinx-routing = { version = "1.20.1", path = "common/nymsphinx/routing" }
-nym-sphinx-types = { version = "1.20.1", path = "common/nymsphinx/types" }
-nym-statistics-common = { version = "1.20.1", path = "common/statistics" }
-nym-store-cipher = { version = "1.20.1", path = "common/store-cipher" }
-nym-task = { version = "1.20.1", path = "common/task" }
-nym-tun = { version = "1.20.1", path = "common/tun" }
-nym-test-utils = { version = "1.20.1", path = "common/test-utils" }
-nym-ticketbooks-merkle = { version = "1.20.1", path = "common/ticketbooks-merkle" }
-nym-topology = { version = "1.20.1", path = "common/topology" }
-nym-types = { version = "1.20.1", path = "common/types" }
-nym-upgrade-mode-check = { version = "1.20.1", path = "common/upgrade-mode-check" }
-nym-validator-client = { version = "1.20.1", path = "common/client-libs/validator-client", default-features = false }
-nym-vesting-contract-common = { version = "1.20.1", path = "common/cosmwasm-smart-contracts/vesting-contract" }
-nym-verloc = { version = "1.20.1", path = "common/verloc" }
-nym-wireguard = { version = "1.20.1", path = "common/wireguard" }
-nym-wireguard-types = { version = "1.20.1", path = "common/wireguard-types" }
-nym-wireguard-private-metadata-shared =  { version = "1.20.1", path = "common/wireguard-private-metadata/shared" }
-nym-wireguard-private-metadata-client =  { version = "1.20.1", path = "common/wireguard-private-metadata/client" }
-nym-wireguard-private-metadata-server =  { version = "1.20.1", path = "common/wireguard-private-metadata/server" }
+nym-api-requests = { version = "1.20.4", path = "nym-api/nym-api-requests" }
+nym-authenticator-requests = { version = "1.20.4", path = "common/authenticator-requests" }
+nym-async-file-watcher = { version = "1.20.4", path = "common/async-file-watcher" }
+nym-authenticator-client = { version = "1.20.4", path = "nym-authenticator-client" }
+nym-bandwidth-controller = { version = "1.20.4", path = "common/bandwidth-controller" }
+nym-bin-common = { version = "1.20.4", path = "common/bin-common" }
+nym-cache = { version = "1.20.4", path = "common/nym-cache" }
+nym-client-core = { version = "1.20.4", path = "common/client-core", default-features = false }
+nym-client-core-config-types = { version = "1.20.4", path = "common/client-core/config-types" }
+nym-client-core-gateways-storage = { version = "1.20.4", path = "common/client-core/gateways-storage" }
+nym-client-core-surb-storage = { version = "1.20.4", path = "common/client-core/surb-storage" }
+nym-client-websocket-requests = { version = "1.20.4", path = "clients/native/websocket-requests" }
+nym-common = { version = "1.20.4", path = "common/nym-common" }
+nym-compact-ecash = { version = "1.20.4", path = "common/nym_offline_compact_ecash" }
+nym-config = { version = "1.20.4", path = "common/config" }
+nym-contracts-common = { version = "1.20.4", path = "common/cosmwasm-smart-contracts/contracts-common" }
+nym-coconut-dkg-common = { version = "1.20.4", path = "common/cosmwasm-smart-contracts/coconut-dkg" }
+nym-credential-storage = { version = "1.20.4", path = "common/credential-storage" }
+nym-credential-utils = { version = "1.20.4", path = "common/credential-utils" }
+nym-credential-proxy-lib = { version = "1.20.4", path = "common/credential-proxy" }
+nym-credentials = { version = "1.20.4", path = "common/credentials", default-features = false }
+nym-credentials-interface = { version = "1.20.4", path = "common/credentials-interface" }
+nym-credential-proxy-requests = { version = "1.20.4", path = "nym-credential-proxy/nym-credential-proxy-requests", default-features = false }
+nym-credential-verification = { version = "1.20.4", path = "common/credential-verification" }
+nym-crypto = { version = "1.20.4", path = "common/crypto", default-features = false }
+nym-dkg = { version = "1.20.4", path = "common/dkg" }
+nym-ecash-contract-common = { version = "1.20.4", path = "common/cosmwasm-smart-contracts/ecash-contract" }
+nym-ecash-signer-check = { version = "1.20.4", path = "common/ecash-signer-check" }
+nym-ecash-signer-check-types = { version = "1.20.4", path = "common/ecash-signer-check-types" }
+nym-ecash-time = { version = "1.20.4", path = "common/ecash-time" }
+nym-exit-policy = { version = "1.20.4", path = "common/exit-policy" }
+nym-ffi-shared = { version = "1.20.4", path = "sdk/ffi/shared" }
+nym-gateway-client = { version = "1.20.4", path = "common/client-libs/gateway-client", default-features = false }
+nym-gateway-requests = { version = "1.20.4", path = "common/gateway-requests" }
+nym-gateway-storage = { version = "1.20.4", path = "common/gateway-storage" }
+nym-gateway-stats-storage = { version = "1.20.4", path = "common/gateway-stats-storage" }
+nym-group-contract-common = { version = "1.20.4", path = "common/cosmwasm-smart-contracts/group-contract" }
+nym-http-api-client = { version = "1.20.4", path = "common/http-api-client" }
+nym-http-api-client-macro = { version = "1.20.4", path = "common/http-api-client-macro" }
+nym-http-api-common = { version = "1.20.4", path = "common/http-api-common", default-features = false }
+nym-id = { version = "1.20.4", path = "common/nym-id" }
+nym-ip-packet-client = { version = "1.20.4", path = "nym-ip-packet-client" }
+nym-ip-packet-requests = { version = "1.20.4", path = "common/ip-packet-requests" }
+nym-kkt-ciphersuite = { path = "common/nym-kkt-ciphersuite" }
+nym-metrics = { version = "1.20.4", path = "common/nym-metrics" }
+nym-mixnet-client = { version = "1.20.4", path = "common/client-libs/mixnet-client" }
+nym-mixnet-contract-common = { version = "1.20.4", path = "common/cosmwasm-smart-contracts/mixnet-contract" }
+nym-multisig-contract-common = { version = "1.20.4", path = "common/cosmwasm-smart-contracts/multisig-contract" }
+nym-network-defaults = { version = "1.20.4", path = "common/network-defaults" }
+nym-node-tester-utils = { version = "1.20.4", path = "common/node-tester-utils" }
+nym-noise = { version = "1.20.4", path = "common/nymnoise" }
+nym-noise-keys = { version = "1.20.4", path = "common/nymnoise/keys" }
+nym-nonexhaustive-delayqueue = { version = "1.20.4", path = "common/nonexhaustive-delayqueue" }
+nym-node-requests = { version = "1.20.4", path = "nym-node/nym-node-requests", default-features = false }
+nym-node-metrics = { version = "1.20.4", path = "nym-node/nym-node-metrics" }
+nym-ordered-buffer = { version = "1.20.4", path = "common/socks5/ordered-buffer" }
+nym-outfox = { version = "1.20.4", path = "nym-outfox" }
+nym-registration-common = { version = "1.20.4", path = "common/registration" }
+nym-pemstore = { version = "1.20.4", path = "common/pemstore" }
+nym-performance-contract-common = { version = "1.20.4", path = "common/cosmwasm-smart-contracts/nym-performance-contract" }
+nym-sdk = { version = "1.20.4", path = "sdk/rust/nym-sdk" }
+nym-serde-helpers = { version = "1.20.4", path = "common/serde-helpers" }
+nym-service-providers-common = { version = "1.20.4", path = "service-providers/common" }
+nym-service-provider-requests-common = { version = "1.20.4", path = "common/service-provider-requests-common" }
+nym-socks5-client-core = { version = "1.20.4", path = "common/socks5-client-core" }
+nym-socks5-proxy-helpers = { version = "1.20.4", path = "common/socks5/proxy-helpers" }
+nym-socks5-requests = { version = "1.20.4", path = "common/socks5/requests" }
+nym-sphinx = { version = "1.20.4", path = "common/nymsphinx" }
+nym-sphinx-acknowledgements = { version = "1.20.4", path = "common/nymsphinx/acknowledgements" }
+nym-sphinx-addressing = { version = "1.20.4", path = "common/nymsphinx/addressing" }
+nym-sphinx-anonymous-replies = { version = "1.20.4", path = "common/nymsphinx/anonymous-replies" }
+nym-sphinx-chunking = { version = "1.20.4", path = "common/nymsphinx/chunking" }
+nym-sphinx-cover = { version = "1.20.4", path = "common/nymsphinx/cover" }
+nym-sphinx-forwarding = { version = "1.20.4", path = "common/nymsphinx/forwarding" }
+nym-sphinx-framing = { version = "1.20.4", path = "common/nymsphinx/framing" }
+nym-sphinx-params = { version = "1.20.4", path = "common/nymsphinx/params" }
+nym-sphinx-routing = { version = "1.20.4", path = "common/nymsphinx/routing" }
+nym-sphinx-types = { version = "1.20.4", path = "common/nymsphinx/types" }
+nym-statistics-common = { version = "1.20.4", path = "common/statistics" }
+nym-store-cipher = { version = "1.20.4", path = "common/store-cipher" }
+nym-task = { version = "1.20.4", path = "common/task" }
+nym-tun = { version = "1.20.4", path = "common/tun" }
+nym-test-utils = { version = "1.20.4", path = "common/test-utils" }
+nym-ticketbooks-merkle = { version = "1.20.4", path = "common/ticketbooks-merkle" }
+nym-topology = { version = "1.20.4", path = "common/topology" }
+nym-types = { version = "1.20.4", path = "common/types" }
+nym-upgrade-mode-check = { version = "1.20.4", path = "common/upgrade-mode-check" }
+nym-validator-client = { version = "1.20.4", path = "common/client-libs/validator-client", default-features = false }
+nym-vesting-contract-common = { version = "1.20.4", path = "common/cosmwasm-smart-contracts/vesting-contract" }
+nym-verloc = { version = "1.20.4", path = "common/verloc" }
+nym-wireguard = { version = "1.20.4", path = "common/wireguard" }
+nym-wireguard-types = { version = "1.20.4", path = "common/wireguard-types" }
+nym-wireguard-private-metadata-shared = { version = "1.20.4", path = "common/wireguard-private-metadata/shared" }
+nym-wireguard-private-metadata-client = { version = "1.20.4", path = "common/wireguard-private-metadata/client" }
+nym-wireguard-private-metadata-server = { version = "1.20.4", path = "common/wireguard-private-metadata/server" }
 nym-sqlx-pool-guard = { version = "1.2.0", path = "nym-sqlx-pool-guard" }
-nym-wasm-client-core = { version = "1.20.1", path = "common/wasm/client-core" }
-nym-wasm-storage = { version = "1.20.1", path = "common/wasm/storage" }
-nym-wasm-utils = { version = "1.20.1", path = "common/wasm/utils", default-features = false }
-nyxd-scraper-shared = { version = "1.20.1", path = "common/nyxd-scraper-shared" }
+nym-wasm-client-core = { version = "1.20.4", path = "common/wasm/client-core" }
+nym-wasm-storage = { version = "1.20.4", path = "common/wasm/storage" }
+nym-wasm-utils = { version = "1.20.4", path = "common/wasm/utils", default-features = false }
+nyxd-scraper-shared = { version = "1.20.4", path = "common/nyxd-scraper-shared" }
 
 # coconut/DKG related
 # unfortunately until https://github.com/zkcrypto/nym-bls12_381-fork/issues/10 is resolved, we have to rely on the fork

clients/native/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "nym-client"
-version = "1.1.68"
+version = "1.1.70"
 authors = ["Dave Hrycyszyn <futurechimp@users.noreply.github.com>", "Jędrzej Stuczyński <andrew@nymtech.net>"]
 description = "Implementation of the Nym Client"
 edition = "2021"

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

@@ -19,7 +19,7 @@
   "license": "Apache-2.0",
   "devDependencies": {
     "clean-webpack-plugin": "^4.0.0",
-    "webpack": "^5.76.0",
+    "webpack": "^5.105.0",
     "webpack-cli": "^4.9.2",
     "webpack-dev-server": "^4.7.4"
   },

clients/socks5/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "nym-socks5-client"
-version = "1.1.68"
+version = "1.1.70"
 authors = ["Dave Hrycyszyn <futurechimp@users.noreply.github.com>"]
 description = "A SOCKS5 localhost proxy that converts incoming messages to Sphinx and sends them to a Nym address"
 edition = "2021"

common/authenticator-requests/src/lib.rs

@@ -18,6 +18,7 @@ mod util;
 mod version;
 
 pub use error::Error;
+pub use util::{authenticator_ipv4_to_ipv6, authenticator_ipv6_to_ipv4};
 pub use v6 as latest;
 pub use version::AuthenticatorVersion;
 

common/authenticator-requests/src/response.rs

@@ -7,6 +7,7 @@ use crate::traits::{
     TopUpBandwidthResponse, UpgradeModeStatus,
 };
 use crate::{v2, v3, v4, v5, v6};
+use nym_sphinx::addressing::Recipient;
 
 #[derive(Debug)]
 pub enum AuthenticatorResponse {
@@ -17,6 +18,17 @@ pub enum AuthenticatorResponse {
     UpgradeMode(Box<dyn UpgradeModeStatus + Send + Sync + 'static>),
 }
 
+pub struct SerialisedResponse {
+    pub bytes: Vec<u8>,
+    pub reply_to: Option<Recipient>,
+}
+
+impl SerialisedResponse {
+    pub fn new(bytes: Vec<u8>, reply_to: Option<Recipient>) -> Self {
+        Self { bytes, reply_to }
+    }
+}
+
 impl UpgradeModeStatus for AuthenticatorResponse {
     fn upgrade_mode_status(&self) -> CurrentUpgradeModeStatus {
         match self {

common/authenticator-requests/src/util.rs

@@ -1,6 +1,38 @@
 // Copyright 2024 - Nym Technologies SA <contact@nymtech.net>
 // SPDX-License-Identifier: Apache-2.0
 
+use nym_network_defaults::{WG_TUN_DEVICE_IP_ADDRESS_V4, WG_TUN_DEVICE_IP_ADDRESS_V6};
+use std::net::{Ipv4Addr, Ipv6Addr};
+
+pub fn authenticator_ipv6_to_ipv4(addr: Ipv6Addr) -> Ipv4Addr {
+    let before_last_byte = addr.octets()[14];
+    let last_byte = addr.octets()[15];
+
+    Ipv4Addr::new(
+        WG_TUN_DEVICE_IP_ADDRESS_V4.octets()[0],
+        WG_TUN_DEVICE_IP_ADDRESS_V4.octets()[1],
+        before_last_byte,
+        last_byte,
+    )
+}
+
+pub fn authenticator_ipv4_to_ipv6(addr: Ipv4Addr) -> Ipv6Addr {
+    let before_last_byte = addr.octets()[2];
+    let last_byte = addr.octets()[3];
+
+    let last_bytes = ((before_last_byte as u16) << 8) | last_byte as u16;
+    Ipv6Addr::new(
+        WG_TUN_DEVICE_IP_ADDRESS_V6.segments()[0],
+        WG_TUN_DEVICE_IP_ADDRESS_V6.segments()[1],
+        WG_TUN_DEVICE_IP_ADDRESS_V6.segments()[2],
+        WG_TUN_DEVICE_IP_ADDRESS_V6.segments()[3],
+        WG_TUN_DEVICE_IP_ADDRESS_V6.segments()[4],
+        WG_TUN_DEVICE_IP_ADDRESS_V6.segments()[5],
+        WG_TUN_DEVICE_IP_ADDRESS_V6.segments()[6],
+        last_bytes,
+    )
+}
+
 #[cfg(test)]
 pub(crate) mod tests {
     pub(crate) const CREDENTIAL_BYTES: [u8; 1245] = [

common/authenticator-requests/src/v4/registration.rs

@@ -2,9 +2,9 @@
 // SPDX-License-Identifier: Apache-2.0
 
 use crate::error::Error;
+use crate::util::{authenticator_ipv4_to_ipv6, authenticator_ipv6_to_ipv4};
 use base64::{Engine, engine::general_purpose};
 use nym_credentials_interface::CredentialSpendingData;
-use nym_network_defaults::constants::{WG_TUN_DEVICE_IP_ADDRESS_V4, WG_TUN_DEVICE_IP_ADDRESS_V6};
 use nym_wireguard_types::PeerPublicKey;
 use serde::{Deserialize, Serialize};
 use std::collections::HashMap;
@@ -56,27 +56,11 @@ impl fmt::Display for IpPair {
 
 impl From<IpAddr> for IpPair {
     fn from(value: IpAddr) -> Self {
-        let (before_last_byte, last_byte) = match value {
-            std::net::IpAddr::V4(ipv4_addr) => (ipv4_addr.octets()[2], ipv4_addr.octets()[3]),
-            std::net::IpAddr::V6(ipv6_addr) => (ipv6_addr.octets()[14], ipv6_addr.octets()[15]),
+        let (ipv4, ipv6) = match value {
+            IpAddr::V4(ipv4) => (ipv4, authenticator_ipv4_to_ipv6(ipv4)),
+            IpAddr::V6(ipv6_addr) => (authenticator_ipv6_to_ipv4(ipv6_addr), ipv6_addr),
         };
-        let last_bytes = ((before_last_byte as u16) << 8) | last_byte as u16;
-        let ipv4 = Ipv4Addr::new(
-            WG_TUN_DEVICE_IP_ADDRESS_V4.octets()[0],
-            WG_TUN_DEVICE_IP_ADDRESS_V4.octets()[1],
-            before_last_byte,
-            last_byte,
-        );
-        let ipv6 = Ipv6Addr::new(
-            WG_TUN_DEVICE_IP_ADDRESS_V6.segments()[0],
-            WG_TUN_DEVICE_IP_ADDRESS_V6.segments()[1],
-            WG_TUN_DEVICE_IP_ADDRESS_V6.segments()[2],
-            WG_TUN_DEVICE_IP_ADDRESS_V6.segments()[3],
-            WG_TUN_DEVICE_IP_ADDRESS_V6.segments()[4],
-            WG_TUN_DEVICE_IP_ADDRESS_V6.segments()[5],
-            WG_TUN_DEVICE_IP_ADDRESS_V6.segments()[6],
-            last_bytes,
-        );
+
         IpPair::new(ipv4, ipv6)
     }
 }

common/authenticator-requests/src/v5/registration.rs

@@ -2,9 +2,9 @@
 // SPDX-License-Identifier: Apache-2.0
 
 use crate::error::Error;
+use crate::util::{authenticator_ipv4_to_ipv6, authenticator_ipv6_to_ipv4};
 use base64::{Engine, engine::general_purpose};
 use nym_credentials_interface::CredentialSpendingData;
-use nym_network_defaults::constants::{WG_TUN_DEVICE_IP_ADDRESS_V4, WG_TUN_DEVICE_IP_ADDRESS_V6};
 use nym_wireguard_types::PeerPublicKey;
 use serde::{Deserialize, Serialize};
 use std::collections::HashMap;
@@ -54,27 +54,11 @@ impl fmt::Display for IpPair {
 
 impl From<IpAddr> for IpPair {
     fn from(value: IpAddr) -> Self {
-        let (before_last_byte, last_byte) = match value {
-            std::net::IpAddr::V4(ipv4_addr) => (ipv4_addr.octets()[2], ipv4_addr.octets()[3]),
-            std::net::IpAddr::V6(ipv6_addr) => (ipv6_addr.octets()[14], ipv6_addr.octets()[15]),
+        let (ipv4, ipv6) = match value {
+            IpAddr::V4(ipv4) => (ipv4, authenticator_ipv4_to_ipv6(ipv4)),
+            IpAddr::V6(ipv6_addr) => (authenticator_ipv6_to_ipv4(ipv6_addr), ipv6_addr),
         };
-        let last_bytes = ((before_last_byte as u16) << 8) | last_byte as u16;
-        let ipv4 = Ipv4Addr::new(
-            WG_TUN_DEVICE_IP_ADDRESS_V4.octets()[0],
-            WG_TUN_DEVICE_IP_ADDRESS_V4.octets()[1],
-            before_last_byte,
-            last_byte,
-        );
-        let ipv6 = Ipv6Addr::new(
-            WG_TUN_DEVICE_IP_ADDRESS_V6.segments()[0],
-            WG_TUN_DEVICE_IP_ADDRESS_V6.segments()[1],
-            WG_TUN_DEVICE_IP_ADDRESS_V6.segments()[2],
-            WG_TUN_DEVICE_IP_ADDRESS_V6.segments()[3],
-            WG_TUN_DEVICE_IP_ADDRESS_V6.segments()[4],
-            WG_TUN_DEVICE_IP_ADDRESS_V6.segments()[5],
-            WG_TUN_DEVICE_IP_ADDRESS_V6.segments()[6],
-            last_bytes,
-        );
+
         IpPair::new(ipv4, ipv6)
     }
 }

common/authenticator-requests/src/v6/registration.rs

@@ -3,13 +3,12 @@
 
 use crate::error::Error;
 use crate::models::BandwidthClaim;
+use crate::util::{authenticator_ipv4_to_ipv6, authenticator_ipv6_to_ipv4};
 use base64::{Engine, engine::general_purpose};
-use nym_network_defaults::constants::{WG_TUN_DEVICE_IP_ADDRESS_V4, WG_TUN_DEVICE_IP_ADDRESS_V6};
 use nym_wireguard_types::PeerPublicKey;
 use serde::{Deserialize, Serialize};
 use std::collections::HashMap;
 use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
-use std::time::SystemTime;
 use std::{fmt, ops::Deref, str::FromStr};
 
 #[cfg(feature = "verify")]
@@ -20,13 +19,11 @@ use nym_crypto::asymmetric::x25519::{PrivateKey, PublicKey};
 use sha2::Sha256;
 
 pub type PendingRegistrations = HashMap<PeerPublicKey, RegistrationData>;
-pub type PrivateIPs = HashMap<IpPair, Taken>;
 
 #[cfg(feature = "verify")]
 pub type HmacSha256 = Hmac<Sha256>;
 
 pub type Nonce = u64;
-pub type Taken = Option<SystemTime>;
 
 #[derive(Copy, Clone, Debug, PartialEq, Eq, Hash, Serialize, Deserialize)]
 pub struct IpPair {
@@ -54,27 +51,11 @@ impl fmt::Display for IpPair {
 
 impl From<IpAddr> for IpPair {
     fn from(value: IpAddr) -> Self {
-        let (before_last_byte, last_byte) = match value {
-            IpAddr::V4(ipv4_addr) => (ipv4_addr.octets()[2], ipv4_addr.octets()[3]),
-            IpAddr::V6(ipv6_addr) => (ipv6_addr.octets()[14], ipv6_addr.octets()[15]),
+        let (ipv4, ipv6) = match value {
+            IpAddr::V4(ipv4) => (ipv4, authenticator_ipv4_to_ipv6(ipv4)),
+            IpAddr::V6(ipv6_addr) => (authenticator_ipv6_to_ipv4(ipv6_addr), ipv6_addr),
         };
-        let last_bytes = ((before_last_byte as u16) << 8) | last_byte as u16;
-        let ipv4 = Ipv4Addr::new(
-            WG_TUN_DEVICE_IP_ADDRESS_V4.octets()[0],
-            WG_TUN_DEVICE_IP_ADDRESS_V4.octets()[1],
-            before_last_byte,
-            last_byte,
-        );
-        let ipv6 = Ipv6Addr::new(
-            WG_TUN_DEVICE_IP_ADDRESS_V6.segments()[0],
-            WG_TUN_DEVICE_IP_ADDRESS_V6.segments()[1],
-            WG_TUN_DEVICE_IP_ADDRESS_V6.segments()[2],
-            WG_TUN_DEVICE_IP_ADDRESS_V6.segments()[3],
-            WG_TUN_DEVICE_IP_ADDRESS_V6.segments()[4],
-            WG_TUN_DEVICE_IP_ADDRESS_V6.segments()[5],
-            WG_TUN_DEVICE_IP_ADDRESS_V6.segments()[6],
-            last_bytes,
-        );
+
         IpPair::new(ipv4, ipv6)
     }
 }

common/bandwidth-controller/src/mock.rs

@@ -21,7 +21,7 @@ pub struct MockBandwidthController {
 impl BandwidthTicketProvider for MockBandwidthController {
     async fn get_ecash_ticket(
         &self,
-        _ticket_type: TicketType,
+        ticket_type: TicketType,
         _gateway_id: PublicKey,
         tickets_to_spend: u32,
     ) -> Result<PreparedCredential, BandwidthControllerError> {
@@ -100,6 +100,10 @@ impl BandwidthTicketProvider for MockBandwidthController {
         let mut credential = CredentialSpendingData::try_from_bytes(&CREDENTIAL_BYTES)
             .expect("Failed to deserialize test credential - this is a bug in the test harness");
 
+        // change the ticket type to the requested ticket
+        // note that verification outside mocks is going to fail
+        credential.payment.t_type = ticket_type.to_repr() as u8;
+
         // Update spend_date to today to pass validation
         credential.spend_date = OffsetDateTime::now_utc().date();
 

common/bandwidth-controller/src/traits.rs

@@ -57,3 +57,22 @@ where
         Ok(Some(token))
     }
 }
+
+#[cfg_attr(target_arch = "wasm32", async_trait(?Send))]
+#[cfg_attr(not(target_arch = "wasm32"), async_trait)]
+impl<T: BandwidthTicketProvider + ?Sized + Send> BandwidthTicketProvider for Box<T> {
+    async fn get_ecash_ticket(
+        &self,
+        ticket_type: TicketType,
+        gateway_id: ed25519::PublicKey,
+        tickets_to_spend: u32,
+    ) -> Result<PreparedCredential, BandwidthControllerError> {
+        (**self)
+            .get_ecash_ticket(ticket_type, gateway_id, tickets_to_spend)
+            .await
+    }
+
+    async fn get_upgrade_mode_token(&self) -> Result<Option<String>, BandwidthControllerError> {
+        (**self).get_upgrade_mode_token().await
+    }
+}

common/bin-common/Cargo.toml

@@ -19,12 +19,15 @@ serde_json = { workspace = true, optional = true }
 
 ## tracing
 tracing-subscriber = { workspace = true, features = ["env-filter"], optional = true }
-tracing-tree = { workspace = true, optional = true }
 tracing = { workspace = true, optional = true }
-opentelemetry-jaeger = { workspace = true, features = ["rt-tokio", "collector_client", "isahc_collector_client"], optional = true }
 tracing-opentelemetry = { workspace = true, optional = true }
 utoipa = { workspace = true, optional = true }
-opentelemetry = { workspace = true, features = ["rt-tokio"], optional = true }
+opentelemetry = { workspace = true, features = ["trace"], optional = true }
+
+## otel-otlp (modern OTLP export to SigNoz/any OTLP collector)
+opentelemetry_sdk = { workspace = true, features = ["trace"], optional = true }
+opentelemetry-otlp = { workspace = true, features = ["grpc-tonic", "trace", "tls-roots"], optional = true }
+tonic = { workspace = true, optional = true }
 
 
 [build-dependencies]
@@ -35,13 +38,14 @@ default = []
 openapi = ["utoipa"]
 output_format = ["serde_json", "dep:clap"]
 bin_info_schema = ["schemars"]
-basic_tracing = ["dep:tracing", "tracing-subscriber"]
-tracing = [
+basic_tracing = ["dep:tracing", "dep:tracing-subscriber"]
+otel-otlp = [
     "basic_tracing",
-    "tracing-tree",
-    "opentelemetry-jaeger",
-    "tracing-opentelemetry",
-    "opentelemetry",
+    "dep:opentelemetry",
+    "dep:opentelemetry_sdk",
+    "dep:opentelemetry-otlp",
+    "dep:tracing-opentelemetry",
+    "dep:tonic",
 ]
 clap = ["dep:clap", "dep:clap_complete", "dep:clap_complete_fig"]
 models = []

common/bin-common/src/build_information/mod.rs

@@ -124,6 +124,10 @@ impl BinaryBuildInformation {
     }
 }
 
+// to whoever is thinking of modifying this struct.
+// you MUST NOT change its structure in any way - adding, removing or changing fields
+// otherwise, it will break old clients as bincode serialisation is not backwards compatible
+// even if you put `#[serde(default)]` all over the place
 #[derive(Clone, Debug, Serialize, Deserialize, PartialEq, Eq)]
 #[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
 #[cfg_attr(feature = "bin_info_schema", derive(schemars::JsonSchema))]

common/bin-common/src/logging/mod.rs

@@ -4,16 +4,9 @@
 use serde::{Deserialize, Serialize};
 use std::io::IsTerminal;
 
-#[cfg(feature = "tracing")]
-pub use opentelemetry;
-#[cfg(feature = "tracing")]
-pub use opentelemetry_jaeger;
-#[cfg(feature = "tracing")]
-pub use tracing_opentelemetry;
-#[cfg(feature = "tracing")]
+// Re-export tracing_subscriber for consumers that need to compose layers
+#[cfg(feature = "basic_tracing")]
 pub use tracing_subscriber;
-#[cfg(feature = "tracing")]
-pub use tracing_tree;
 
 #[derive(Debug, Default, Copy, Clone, Deserialize, PartialEq, Eq, Serialize)]
 #[serde(deny_unknown_fields)]
@@ -69,40 +62,106 @@ pub fn setup_tracing_logger() {
     build_tracing_logger().init()
 }
 
-// TODO: This has to be a macro, running it as a function does not work for the file_appender for some reason
-#[cfg(feature = "tracing")]
-#[macro_export]
-macro_rules! setup_tracing {
-    ($service_name: expr) => {
-        use nym_bin_common::logging::tracing_subscriber::layer::SubscriberExt;
-        use nym_bin_common::logging::tracing_subscriber::util::SubscriberInitExt;
+/// Initialize an OpenTelemetry tracing layer that exports spans via OTLP/gRPC.
+///
+/// This produces a layer compatible with `tracing_subscriber::registry()` that
+/// sends traces to any OTLP-compatible collector (SigNoz, Grafana Tempo, etc).
+///
+/// Returns both the tracing layer and the [`SdkTracerProvider`] so the caller
+/// can invoke [`SdkTracerProvider::shutdown`] for graceful flush on exit.
+///
+/// # Arguments
+/// * `service_name` - The service name reported to the collector (e.g. "nym-node")
+/// * `endpoint` - The OTLP/gRPC collector endpoint (e.g. "http://localhost:4317"
+///   or "https://ingest.eu.signoz.cloud:443" for SigNoz Cloud)
+/// * `ingestion_key` - Optional SigNoz Cloud ingestion key. When provided, it is
+///   sent as the `signoz-ingestion-key` gRPC metadata header on every export.
+/// * `environment` - Deployment environment label (e.g. "sandbox", "mainnet", "canary").
+///   Attached as the `deployment.environment` OTel resource attribute.
+/// * `sample_ratio` - Trace sampling ratio in 0.0..=1.0 (e.g. 0.1 = 10% of traces).
+///   Used to limit cost when exporting from many nodes; clamped to [0.0, 1.0].
+/// * `export_timeout_secs` - Timeout in seconds for each OTLP export batch. Prevents
+///   unbounded blocking if the collector is slow or unreachable.
+#[cfg(feature = "otel-otlp")]
+pub fn init_otel_layer<S>(
+    service_name: &str,
+    endpoint: &str,
+    ingestion_key: Option<&str>,
+    environment: &str,
+    sample_ratio: f64,
+    export_timeout_secs: u64,
+) -> Result<
+    (
+        tracing_opentelemetry::OpenTelemetryLayer<S, opentelemetry_sdk::trace::SdkTracer>,
+        opentelemetry_sdk::trace::SdkTracerProvider,
+    ),
+    Box<dyn std::error::Error + Send + Sync>,
+>
+where
+    S: tracing::Subscriber + for<'a> tracing_subscriber::registry::LookupSpan<'a>,
+{
+    use opentelemetry::trace::TracerProvider as _;
+    use opentelemetry_otlp::WithExportConfig;
+    use opentelemetry_otlp::WithTonicConfig;
+    use opentelemetry_sdk::trace::Sampler;
+    use std::time::Duration;
 
-        let registry = nym_bin_common::logging::tracing_subscriber::Registry::default()
-            .with(nym_bin_common::logging::tracing_subscriber::EnvFilter::from_default_env())
-            .with(
-                nym_bin_common::logging::tracing_tree::HierarchicalLayer::new(4)
-                    .with_targets(true)
-                    .with_bracketed_fields(true),
-            );
+    // Validate endpoint URI early to fail with a clear message
+    if !endpoint.starts_with("http://") && !endpoint.starts_with("https://") {
+        return Err(format!(
+            "invalid OTLP endpoint URI: {endpoint} (must start with http:// or https://)"
+        )
+        .into());
+    }
 
-        let tracer = nym_bin_common::logging::opentelemetry_jaeger::new_collector_pipeline()
-            .with_endpoint("http://44.199.230.10:14268/api/traces")
-            .with_service_name($service_name)
-            .with_isahc()
-            .with_trace_config(
-                nym_bin_common::logging::opentelemetry::sdk::trace::config().with_sampler(
-                    nym_bin_common::logging::opentelemetry::sdk::trace::Sampler::TraceIdRatioBased(
-                        0.1,
-                    ),
-                ),
-            )
-            .install_batch(nym_bin_common::logging::opentelemetry::runtime::Tokio)
-            .expect("Could not init tracer");
+    let sample_ratio_clamped = sample_ratio.clamp(0.0, 1.0);
 
-        let telemetry = nym_bin_common::logging::tracing_opentelemetry::layer().with_tracer(tracer);
+    let mut builder = opentelemetry_otlp::SpanExporter::builder()
+        .with_tonic()
+        .with_endpoint(endpoint)
+        .with_timeout(Duration::from_secs(export_timeout_secs));
 
-        registry.with(telemetry).init();
-    };
+    // Explicitly configure TLS when the endpoint uses HTTPS
+    if endpoint.starts_with("https://") {
+        builder =
+            builder.with_tls_config(tonic::transport::ClientTlsConfig::new().with_native_roots());
+    }
+
+    if let Some(key) = ingestion_key {
+        let mut metadata = tonic::metadata::MetadataMap::new();
+        metadata.insert(
+            "signoz-ingestion-key",
+            key.parse()
+                .map_err(|_| "invalid ingestion key format (value redacted)")?,
+        );
+        builder = builder.with_metadata(metadata);
+    }
+
+    let exporter = builder
+        .build()
+        .map_err(|e| format!("failed to build OTLP exporter for endpoint {endpoint}: {e}"))?;
+
+    let tracer_provider = opentelemetry_sdk::trace::SdkTracerProvider::builder()
+        .with_sampler(Sampler::TraceIdRatioBased(sample_ratio_clamped))
+        .with_batch_exporter(exporter)
+        .with_resource(
+            opentelemetry_sdk::Resource::builder()
+                .with_service_name(service_name.to_owned())
+                .with_attribute(opentelemetry::KeyValue::new(
+                    "deployment.environment",
+                    environment.to_owned(),
+                ))
+                .build(),
+        )
+        .build();
+
+    opentelemetry::global::set_tracer_provider(tracer_provider.clone());
+    let tracer = tracer_provider.tracer(service_name.to_owned());
+
+    Ok((
+        tracing_opentelemetry::layer().with_tracer(tracer),
+        tracer_provider,
+    ))
 }
 
 pub fn banner(crate_name: &str, crate_version: &str) -> String {

common/client-core/src/client/base_client/storage/mod.rs

@@ -26,7 +26,7 @@ use crate::{
     error::ClientCoreError,
 };
 #[cfg(all(not(target_arch = "wasm32"), feature = "fs-credentials-storage"))]
-use nym_credential_storage::persistent_storage::PersistentStorage as PersistentCredentialStorage;
+pub use nym_credential_storage::persistent_storage::PersistentStorage as PersistentCredentialStorage;
 
 pub use nym_client_core_gateways_storage as gateways_storage;
 pub use nym_client_core_gateways_storage::{GatewaysDetailsStore, InMemGatewaysDetails};

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

@@ -128,54 +128,95 @@ impl ManagedConnection {
 
     async fn run(self) {
         let address = self.address;
+        let reconnection_attempt = self.current_reconnection.load(Ordering::Acquire);
+        let connect_start = tokio::time::Instant::now();
         let connection_fut = TcpStream::connect(address);
 
         let conn = match tokio::time::timeout(self.connection_timeout, connection_fut).await {
             Ok(stream_res) => match stream_res {
                 Ok(stream) => {
-                    debug!("Managed to establish connection to {}", self.address);
+                    let connect_ms = connect_start.elapsed().as_millis() as u64;
+                    debug!(
+                        peer = %address,
+                        connect_ms,
+                        "Managed to establish connection to {}", self.address
+                    );
 
+                    let noise_start = tokio::time::Instant::now();
                     let noise_stream =
                         match upgrade_noise_initiator(stream, &self.noise_config).await {
                             Ok(noise_stream) => noise_stream,
                             Err(err) => {
-                                error!("Failed to perform Noise handshake with {address} - {err}");
-                                // we failed to finish the noise handshake - increase reconnection attempt
+                                let noise_handshake_ms = noise_start.elapsed().as_millis() as u64;
+                                warn!(
+                                    event = "connection.failed.noise",
+                                    peer = %address,
+                                    error = %err,
+                                    connect_ms,
+                                    noise_handshake_ms,
+                                    reconnection_attempt,
+                                    exit_reason = "noise_error",
+                                    "Failed to perform Noise initiator handshake with {address}"
+                                );
                                 self.current_reconnection.fetch_add(1, Ordering::SeqCst);
                                 return;
                             }
                         };
-                    // if we managed to connect AND do the noise handshake, reset the reconnection count (whatever it might have been)
+                    let noise_handshake_ms = noise_start.elapsed().as_millis() as u64;
                     self.current_reconnection.store(0, Ordering::Release);
-                    debug!("Noise initiator handshake completed for {:?}", address);
+                    debug!(
+                        peer = %address,
+                        connect_ms,
+                        noise_handshake_ms,
+                        "Noise initiator handshake completed for {:?}", address
+                    );
                     Framed::new(noise_stream, NymCodec)
                 }
                 Err(err) => {
-                    debug!("failed to establish connection to {address} (err: {err})",);
+                    let connect_ms = connect_start.elapsed().as_millis() as u64;
+                    warn!(
+                        event = "connection.failed.connect",
+                        peer = %address,
+                        error = %err,
+                        connect_ms,
+                        reconnection_attempt,
+                        exit_reason = "connect_error",
+                        "failed to establish connection to {address}"
+                    );
                     return;
                 }
             },
             Err(_) => {
-                debug!(
+                let connect_ms = connect_start.elapsed().as_millis() as u64;
+                warn!(
+                    event = "connection.failed.timeout",
+                    peer = %address,
+                    timeout_ms = self.connection_timeout.as_millis() as u64,
+                    connect_ms,
+                    reconnection_attempt,
+                    exit_reason = "timeout",
                     "failed to connect to {address} within {:?}",
                     self.connection_timeout
                 );
-
-                // we failed to connect - increase reconnection attempt
                 self.current_reconnection.fetch_add(1, Ordering::SeqCst);
                 return;
             }
         };
 
-        // Take whatever the receiver channel produces and put it on the connection.
-        // We could have as well used conn.send_all(receiver.map(Ok)), but considering we don't care
-        // about neither receiver nor the connection, it doesn't matter which one gets consumed
         if let Err(err) = self.message_receiver.map(Ok).forward(conn).await {
-            warn!("Failed to forward packets to {address}: {err}");
+            warn!(
+                event = "connection.forward_error",
+                peer = %address,
+                error = %err,
+                exit_reason = "forward_error",
+                "Failed to forward packets to {address}: {err}"
+            );
         }
 
         debug!(
-            "connection manager to {address} is finished. Either the connection failed or mixnet client got dropped",
+            peer = %address,
+            exit_reason = "sender_dropped",
+            "connection manager to {address} finished"
         );
     }
 }
@@ -272,16 +313,18 @@ impl SendWithoutResponse for Client {
         trace!("Sending packet to {address}");
 
         // TODO: optimisation for the future: rather than constantly using legacy encoding,
-        // once we're addressing by node_id (and thus have full node info here),
-        // we could simply infer supported encoding based on their version
+        // use the mix packet type / flags to pick encoding per packet
         let framed_packet =
             FramedNymPacket::from_mix_packet(packet, self.config.use_legacy_packet_encoding);
 
         let Some(sender) = self.active_connections.get_mut(&address) else {
             // there was never a connection to begin with
-            debug!("establishing initial connection to {address}");
-            // it's not a 'big' error, but we did not manage to send the packet, but queue the packet
-            // for sending for as soon as the connection is created
+            debug!(
+                event = "mixclient.try_send",
+                peer = %address,
+                result = "not_connected",
+                "establishing initial connection to {address}"
+            );
             self.make_connection(address, framed_packet);
             return Err(io::Error::new(
                 io::ErrorKind::NotConnected,
@@ -289,15 +332,24 @@ impl SendWithoutResponse for Client {
             ));
         };
 
+        let channel_capacity = sender.channel.max_capacity();
+        let channel_available = sender.channel.capacity();
+        let channel_used = channel_capacity - channel_available;
+
         let sending_res = sender.channel.try_send(framed_packet);
         drop(sender);
 
         sending_res.map_err(|err| {
             match err {
                 TrySendError::Full(_) => {
-                    debug!("Connection to {address} seems to not be able to handle all the traffic - dropping the current packet");
-                    // it's not a 'big' error, but we did not manage to send the packet
-                    // if the queue is full, we can't really do anything but to drop the packet
+                    warn!(
+                        event = "mixclient.try_send",
+                        peer = %address,
+                        result = "full_dropped",
+                        channel_capacity,
+                        channel_used,
+                        "dropping packet: connection buffer to {address} is full ({channel_used}/{channel_capacity})"
+                    );
                     io::Error::new(
                         io::ErrorKind::WouldBlock,
                         "connection queue is full",
@@ -305,11 +357,13 @@ impl SendWithoutResponse for Client {
                 }
                 TrySendError::Closed(dropped) => {
                     debug!(
-                        "Connection to {address} seems to be dead. attempting to re-establish it...",
+                        event = "mixclient.try_send",
+                        peer = %address,
+                        result = "closed_reconnecting",
+                        channel_capacity,
+                        channel_used,
+                        "connection to {address} dead, attempting re-establishment"
                     );
-
-                    // it's not a 'big' error, but we did not manage to send the packet, but queue
-                    // it up to send it as soon as the connection is re-established
                     self.make_connection(address, dropped);
                     io::Error::new(
                         io::ErrorKind::ConnectionAborted,

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

@@ -76,7 +76,7 @@ features = ["json"]
 
 [target."cfg(not(target_arch = \"wasm32\"))".dependencies.reqwest]
 workspace = true
-features = ["json", "rustls-tls"]
+features = ["json", "rustls"]
 
 [dev-dependencies]
 anyhow = { workspace = true }

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

@@ -20,7 +20,7 @@ use nym_api_requests::ecash::{
 };
 use nym_api_requests::models::{
     ApiHealthResponse, GatewayCoreStatusResponse, HistoricalPerformanceResponse,
-    MixnodeCoreStatusResponse, NymNodeDescription,
+    MixnodeCoreStatusResponse, NymNodeDescriptionV1,
 };
 use nym_api_requests::nym_nodes::{
     NodesByAddressesResponse, SemiSkimmedNodesWithMetadata, SkimmedNode, SkimmedNodesWithMetadata,
@@ -273,48 +273,23 @@ impl<C, S> Client<C, S> {
         Ok(history)
     }
 
-    // TODO: combine with NymApiClient...
+    // #[deprecated(note = "use get_all_cached_described_nodes_v2 instead")]
     pub async fn get_all_cached_described_nodes(
         &self,
-    ) -> Result<Vec<NymNodeDescription>, ValidatorClientError> {
-        // TODO: deal with paging in macro or some helper function or something, because it's the same pattern everywhere
-        let mut page = 0;
-        let mut descriptions = Vec::new();
-
-        loop {
-            let mut res = self.nym_api.get_nodes_described(Some(page), None).await?;
-
-            descriptions.append(&mut res.data);
-            if descriptions.len() < res.pagination.total {
-                page += 1
-            } else {
-                break;
-            }
-        }
-
-        Ok(descriptions)
+    ) -> Result<Vec<NymNodeDescriptionV1>, ValidatorClientError> {
+        Ok(self.nym_api.get_all_described_nodes().await?)
     }
 
-    // TODO: combine with NymApiClient...
+    // pub async fn get_all_cached_described_nodes_v2(
+    //     &self,
+    // ) -> Result<Vec<NymNodeDescriptionV2>, ValidatorClientError> {
+    //     Ok(self.nym_api.get_all_described_nodes_v2().await?)
+    // }
+
     pub async fn get_all_cached_bonded_nym_nodes(
         &self,
     ) -> Result<Vec<NymNodeDetails>, ValidatorClientError> {
-        // TODO: deal with paging in macro or some helper function or something, because it's the same pattern everywhere
-        let mut page = 0;
-        let mut bonds = Vec::new();
-
-        loop {
-            let mut res = self.nym_api.get_nym_nodes(Some(page), None).await?;
-
-            bonds.append(&mut res.data);
-            if bonds.len() < res.pagination.total {
-                page += 1
-            } else {
-                break;
-            }
-        }
-
-        Ok(bonds)
+        self.nym_api.get_all_bonded_nym_nodes().await
     }
 
     pub async fn blind_sign(
@@ -498,9 +473,10 @@ impl NymApiClient {
         Ok(self.nym_api.health().await?)
     }
 
+    // #[deprecated(note = "use .get_all_described_nodes_v2 instead")]
     pub async fn get_all_described_nodes(
         &self,
-    ) -> Result<Vec<NymNodeDescription>, ValidatorClientError> {
+    ) -> Result<Vec<NymNodeDescriptionV1>, ValidatorClientError> {
         // TODO: deal with paging in macro or some helper function or something, because it's the same pattern everywhere
         let mut page = 0;
         let mut descriptions = Vec::new();
@@ -519,6 +495,30 @@ impl NymApiClient {
         Ok(descriptions)
     }
 
+    // pub async fn get_all_described_nodes_v2(
+    //     &self,
+    // ) -> Result<Vec<NymNodeDescriptionV2>, ValidatorClientError> {
+    //     // TODO: deal with paging in macro or some helper function or something, because it's the same pattern everywhere
+    //     let mut page = 0;
+    //     let mut descriptions = Vec::new();
+    //
+    //     loop {
+    //         let mut res = self
+    //             .nym_api
+    //             .get_nodes_described_v2(Some(page), None)
+    //             .await?;
+    //
+    //         descriptions.append(&mut res.data);
+    //         if descriptions.len() < res.pagination.total {
+    //             page += 1
+    //         } else {
+    //             break;
+    //         }
+    //     }
+    //
+    //     Ok(descriptions)
+    // }
+
     pub async fn get_all_bonded_nym_nodes(
         &self,
     ) -> Result<Vec<NymNodeDetails>, ValidatorClientError> {

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

@@ -17,7 +17,8 @@ use nym_api_requests::ecash::VerificationKeyResponse;
 use nym_api_requests::models::{
     AnnotationResponse, ApiHealthResponse, BinaryBuildInformationOwned, ChainBlocksStatusResponse,
     ChainStatusResponse, KeyRotationInfoResponse, NodePerformanceResponse, NodeRefreshBody,
-    NymNodeDescription, PerformanceHistoryResponse, RewardedSetResponse, SignerInformationResponse,
+    NymNodeDescriptionV1, PerformanceHistoryResponse, RewardedSetResponse,
+    SignerInformationResponse,
 };
 use nym_api_requests::nym_nodes::{
     NodesByAddressesRequestBody, NodesByAddressesResponse, PaginatedCachedNodesResponseV1,
@@ -116,11 +117,12 @@ pub trait NymApiClientExt: ApiClient {
     }
 
     #[tracing::instrument(level = "debug", skip_all)]
+    // #[deprecated(note = "use .get_nodes_described_v2 instead")]
     async fn get_nodes_described(
         &self,
         page: Option<u32>,
         per_page: Option<u32>,
-    ) -> Result<PaginatedResponse<NymNodeDescription>, NymAPIError> {
+    ) -> Result<PaginatedResponse<NymNodeDescriptionV1>, NymAPIError> {
         let mut params = Vec::new();
 
         if let Some(page) = page {
@@ -142,6 +144,33 @@ pub trait NymApiClientExt: ApiClient {
         .await
     }
 
+    // #[tracing::instrument(level = "debug", skip_all)]
+    // async fn get_nodes_described_v2(
+    //     &self,
+    //     page: Option<u32>,
+    //     per_page: Option<u32>,
+    // ) -> Result<PaginatedResponse<NymNodeDescriptionV2>, NymAPIError> {
+    //     let mut params = Vec::new();
+    //
+    //     if let Some(page) = page {
+    //         params.push(("page", page.to_string()))
+    //     }
+    //
+    //     if let Some(per_page) = per_page {
+    //         params.push(("per_page", per_page.to_string()))
+    //     }
+    //
+    //     self.get_json(
+    //         &[
+    //             routes::V2_API_VERSION,
+    //             routes::NYM_NODES_ROUTES,
+    //             routes::NYM_NODES_DESCRIBED,
+    //         ],
+    //         &params,
+    //     )
+    //     .await
+    // }
+
     async fn get_current_rewarded_set(&self) -> Result<RewardedSetResponse, NymAPIError> {
         self.get_rewarded_set().await
     }
@@ -273,7 +302,9 @@ pub trait NymApiClientExt: ApiClient {
         Ok(SkimmedNodesWithMetadata::new(nodes, metadata))
     }
 
-    async fn get_all_described_nodes(&self) -> Result<Vec<NymNodeDescription>, NymAPIError> {
+    // #[deprecated(note = "use .get_all_described_nodes_v2 instead")]
+    // #[allow(deprecated)]
+    async fn get_all_described_nodes(&self) -> Result<Vec<NymNodeDescriptionV1>, NymAPIError> {
         // TODO: deal with paging in macro or some helper function or something, because it's the same pattern everywhere
         let mut page = 0;
         let mut descriptions = Vec::new();
@@ -292,6 +323,25 @@ pub trait NymApiClientExt: ApiClient {
         Ok(descriptions)
     }
 
+    // async fn (&self) -> Result<Vec<NymNodeDescriptionV2>, NymAPIError> {
+    //     // TODO: deal with paging in macro or some helper function or something, because it's the same pattern everywhere
+    //     let mut page = 0;
+    //     let mut descriptions = Vec::new();
+    //
+    //     loop {
+    //         let mut res = self.get_nodes_described_v2(Some(page), None).await?;
+    //
+    //         descriptions.append(&mut res.data);
+    //         if descriptions.len() < res.pagination.total {
+    //             page += 1
+    //         } else {
+    //             break;
+    //         }
+    //     }
+    //
+    //     Ok(descriptions)
+    // }
+
     #[tracing::instrument(level = "debug", skip_all)]
     async fn get_nym_nodes(
         &self,

common/credential-proxy/Cargo.toml

@@ -19,7 +19,7 @@ bs58 = { workspace = true }
 futures = { workspace = true }
 humantime = { workspace = true }
 rand = { workspace = true }
-reqwest = { workspace = true, features = ["rustls-tls"] }
+reqwest = { workspace = true, features = ["rustls"] }
 serde = { workspace = true, features = ["derive"] }
 serde_json = { workspace = true }
 strum = { workspace = true, features = ["derive"] }

common/credential-verification/src/lib.rs

@@ -22,6 +22,8 @@ pub mod ecash;
 pub mod error;
 pub mod upgrade_mode;
 
+const MOCK_BANDWIDTH: i64 = 2024 * 1024 * 1024;
+
 // Histogram buckets for ecash verification duration (in seconds)
 const ECASH_VERIFICATION_DURATION_BUCKETS: &[f64] =
     &[0.001, 0.005, 0.01, 0.05, 0.1, 0.5, 1.0, 2.0, 5.0];
@@ -111,6 +113,13 @@ impl CredentialVerifier {
     }
 
     pub async fn verify(&mut self) -> Result<i64> {
+        if self.ecash_verifier.is_mock() {
+            // if we're in the mock mode (local testing), skip cryptographic verification
+            // and just return a dummy bandwidth value since we don't have blockchain access
+            // Return a reasonable test bandwidth value (e.g., 1GB in bytes)
+            return Ok(MOCK_BANDWIDTH);
+        }
+
         let start = Instant::now();
         nym_metrics::inc!("ecash_verification_attempts");
 

common/credential-verification/src/upgrade_mode.rs

@@ -291,3 +291,40 @@ struct UpgradeModeStateInner {
     // (and dealing with the async consequences of that)
     status: UpgradeModeStatus,
 }
+
+pub mod testing {
+    use crate::UpgradeModeState;
+    use crate::upgrade_mode::{
+        CheckRequest, UpgradeModeCheckConfig, UpgradeModeCheckRequestSender, UpgradeModeDetails,
+    };
+    use futures::channel::mpsc::UnboundedReceiver;
+    use nym_crypto::asymmetric::ed25519;
+    use std::time::Duration;
+
+    pub fn mock_dummy_upgrade_mode_details() -> (UpgradeModeDetails, UnboundedReceiver<CheckRequest>)
+    {
+        let (um_recheck_tx, um_recheck_rx) = futures::channel::mpsc::unbounded();
+
+        const DUMMY_ATTESTER_ED25519_PRIVATE_KEY: [u8; 32] = [
+            108, 49, 193, 21, 126, 161, 249, 85, 242, 207, 74, 195, 238, 6, 64, 149, 201, 140, 248,
+            163, 122, 170, 79, 198, 87, 85, 36, 29, 243, 92, 64, 161,
+        ];
+
+        pub(crate) fn dummy_attester_public_key() -> ed25519::PublicKey {
+            let private_key =
+                ed25519::PrivateKey::from_bytes(&DUMMY_ATTESTER_ED25519_PRIVATE_KEY).unwrap();
+            private_key.public_key()
+        }
+
+        let upgrade_mode_state = UpgradeModeState::new(dummy_attester_public_key());
+        let upgrade_mode_details = UpgradeModeDetails::new(
+            UpgradeModeCheckConfig {
+                // essentially we never want to trigger this in our tests
+                min_staleness_recheck: Duration::from_nanos(1),
+            },
+            UpgradeModeCheckRequestSender::new(um_recheck_tx),
+            upgrade_mode_state.clone(),
+        );
+        (upgrade_mode_details, um_recheck_rx)
+    }
+}

common/crypto/Cargo.toml

@@ -33,7 +33,7 @@ thiserror = { workspace = true }
 zeroize = { workspace = true, optional = true, features = ["zeroize_derive"] }
 
 # internal
-nym-sphinx-types = { workspace = true }
+nym-sphinx-types = { workspace = true, optional = true }
 nym-pemstore = { workspace = true }
 
 [dev-dependencies]
@@ -51,7 +51,7 @@ serde = ["dep:serde", "serde_bytes", "ed25519-dalek/serde", "x25519-dalek/serde"
 asymmetric = ["x25519-dalek", "ed25519-dalek", "curve25519-dalek", "sha2", "zeroize"]
 hashing = ["blake3", "digest", "hkdf", "hmac", "generic-array", "sha2", "zeroize"]
 stream_cipher = ["aes", "ctr", "cipher", "generic-array"]
-sphinx = ["nym-sphinx-types/sphinx"]
+sphinx = ["nym-sphinx-types", "nym-sphinx-types/sphinx"]
 
 [lints]
 workspace = true

common/ecash-signer-check/Cargo.toml

@@ -15,6 +15,7 @@ description = "Functions to interact with zknym signers, checking their status a
 futures = { workspace = true }
 thiserror = { workspace = true }
 semver = { workspace = true }
+serde = { workspace = true }
 tokio = { workspace = true, features = ["time"] }
 tracing = { workspace = true }
 url = { workspace = true }

common/ecash-signer-check/src/lib.rs

@@ -3,14 +3,9 @@
 
 use crate::client_check::check_client;
 use futures::stream::{FuturesUnordered, StreamExt};
+use nym_ecash_signer_check_types::status::{SignerResult, Status};
 use nym_network_defaults::NymNetworkDetails;
 use nym_validator_client::QueryHttpRpcNyxdClient;
-use nym_validator_client::nyxd::contract_traits::{DkgQueryClient, PagedDkgQueryClient};
-use std::collections::HashMap;
-use url::Url;
-
-pub use error::SignerCheckError;
-use nym_ecash_signer_check_types::status::{SignerResult, Status};
 use nym_validator_client::ecash::models::EcashSignerStatusResponse;
 use nym_validator_client::models::{
     ChainBlocksStatusResponse, ChainStatusResponse, SignerInformationResponse,
@@ -18,6 +13,12 @@ use nym_validator_client::models::{
 use nym_validator_client::nyxd::contract_traits::dkg_query_client::{
     ContractVKShare, DealerDetails, Epoch,
 };
+use nym_validator_client::nyxd::contract_traits::{DkgQueryClient, PagedDkgQueryClient};
+use serde::{Deserialize, Serialize};
+use std::collections::HashMap;
+use url::Url;
+
+pub use error::SignerCheckError;
 
 mod client_check;
 pub mod error;
@@ -31,6 +32,7 @@ pub type TypedSignerResult = SignerResult<
 pub type LocalChainStatus = Status<ChainStatusResponse, ChainBlocksStatusResponse>;
 pub type SigningStatus = Status<SignerInformationResponse, EcashSignerStatusResponse>;
 
+#[derive(Serialize, Deserialize)]
 pub struct SignersTestResult {
     pub threshold: Option<u64>,
     pub results: Vec<TypedSignerResult>,

common/gateway-storage/migrations/20260127120000_add_wireguard_peer_psk.sql

@@ -0,0 +1,7 @@
+/*
+ * Copyright 2026 - Nym Technologies SA <contact@nymtech.net>
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+ALTER TABLE wireguard_peer
+    ADD COLUMN psk VARCHAR;

common/gateway-storage/src/lib.rs

@@ -577,4 +577,21 @@ impl BandwidthGatewayStorage for GatewayStorage {
             .await?;
         Ok(())
     }
+
+    /// Update the stored PSK of the wireguard peer.
+    ///
+    /// # Arguments
+    ///
+    /// * `public_key`: the unique public key of the wireguard peer.
+    /// * `psk`: the PSK of the wireguard peer.
+    async fn update_peer_psk(
+        &self,
+        public_key: &str,
+        psk: Option<&str>,
+    ) -> Result<(), GatewayStorageError> {
+        self.wireguard_peer_manager
+            .update_peer_psk(public_key, psk)
+            .await?;
+        Ok(())
+    }
 }

common/gateway-storage/src/models.rs

@@ -2,6 +2,7 @@
 // SPDX-License-Identifier: GPL-3.0-only
 
 use crate::{error::GatewayStorageError, make_bincode_serializer};
+use defguard_wireguard_rs::key::Key;
 use nym_credentials_interface::{AvailableBandwidth, ClientTicket, CredentialSpendingData};
 use nym_gateway_requests::shared_key::SharedSymmetricKey;
 use sqlx::FromRow;
@@ -95,6 +96,7 @@ pub struct WireguardPeer {
     pub public_key: String,
     pub allowed_ips: Vec<u8>,
     pub client_id: i64,
+    pub psk: Option<String>,
 }
 
 impl WireguardPeer {
@@ -110,6 +112,7 @@ impl WireguardPeer {
                     source,
                 })?,
             client_id,
+            psk: value.preshared_key.map(|psk| psk.to_lower_hex()),
         })
     }
 }
@@ -132,6 +135,11 @@ impl TryFrom<WireguardPeer> for defguard_wireguard_rs::host::Peer {
                 field_key: "allowed_ips",
                 source,
             })?,
+            preshared_key: value
+                .psk
+                .map(|psk| Key::decode(&psk))
+                .transpose()
+                .map_err(|_| Self::Error::TypeConversion { field_key: "psk" })?,
             ..Default::default()
         })
     }

common/gateway-storage/src/traits.rs

@@ -170,6 +170,18 @@ pub trait BandwidthGatewayStorage: dyn_clone::DynClone {
     /// * `peer_public_key`: wireguard public key of the peer to be removed.
     async fn remove_wireguard_peer(&self, peer_public_key: &str)
     -> Result<(), GatewayStorageError>;
+
+    /// Update the stored PSK of the wireguard peer.
+    ///
+    /// # Arguments
+    ///
+    /// * `public_key`: the unique public key of the wireguard peer.
+    /// * `psk`: the PSK of the wireguard peer.
+    async fn update_peer_psk(
+        &self,
+        public_key: &str,
+        psk: Option<&str>,
+    ) -> Result<(), GatewayStorageError>;
 }
 
 #[cfg(feature = "mock")]
@@ -507,5 +519,16 @@ pub mod mock {
             self.write().await.wireguard_peers.remove(peer_public_key);
             Ok(())
         }
+
+        async fn update_peer_psk(
+            &self,
+            public_key: &str,
+            psk: Option<&str>,
+        ) -> Result<(), GatewayStorageError> {
+            if let Some(peer) = self.write().await.wireguard_peers.get_mut(public_key) {
+                peer.psk = psk.map(|psk| psk.to_owned())
+            }
+            Ok(())
+        }
     }
 }

common/gateway-storage/src/wireguard_peers.rs

@@ -98,4 +98,29 @@ impl WgPeerManager {
         .await?;
         Ok(())
     }
+
+    /// Update the stored PSK of the wireguard peer.
+    ///
+    /// # Arguments
+    ///
+    /// * `public_key`: the unique public key of the wireguard peer.
+    /// * `psk`: the PSK of the wireguard peer.
+    pub(crate) async fn update_peer_psk(
+        &self,
+        public_key: &str,
+        psk: Option<&str>,
+    ) -> Result<(), sqlx::Error> {
+        sqlx::query!(
+            r#"
+                UPDATE wireguard_peer
+                SET psk = ?
+                WHERE public_key = ?
+            "#,
+            psk,
+            public_key,
+        )
+        .execute(&self.connection_pool)
+        .await?;
+        Ok(())
+    }
 }

common/http-api-client/Cargo.toml

@@ -21,7 +21,7 @@ debug-inventory = ["nym-http-api-client-macro/debug-inventory"]
 async-trait = { workspace = true }
 bincode = { workspace = true }
 cfg-if = { workspace = true}
-reqwest = { workspace = true, features = ["json", "gzip", "deflate", "brotli", "zstd", "rustls-tls"] }
+reqwest = { workspace = true, features = ["json", "gzip", "deflate", "brotli", "zstd", "rustls"] }
 http.workspace = true
 url = { workspace = true }
 once_cell = { workspace = true }

common/http-api-client/src/dns.rs

@@ -46,7 +46,10 @@ use std::{
     collections::HashMap,
     net::{IpAddr, SocketAddr},
     str::FromStr,
-    sync::{Arc, LazyLock},
+    sync::{
+        Arc, LazyLock,
+        atomic::{AtomicBool, Ordering::Relaxed},
+    },
     time::Duration,
 };
 
@@ -70,14 +73,23 @@ pub(crate) const DEFAULT_QUERY_TIMEOUT: Duration = Duration::from_secs(5);
 
 impl ClientBuilder {
     /// Override the DNS resolver implementation used by the underlying http client.
+    /// This forces the use of an independent request executor (via [`Self::non_shared`]).
     pub fn dns_resolver<R: Resolve + 'static>(mut self, resolver: Arc<R>) -> Self {
-        self.reqwest_client_builder = self.reqwest_client_builder.dns_resolver(resolver);
+        self = self.non_shared();
+        // because of the call to non-shared this conditional should always run.
+        if let Some(rb) = self.reqwest_client_builder {
+            self.reqwest_client_builder = Some(rb.dns_resolver(resolver));
+        }
         self.use_secure_dns = false;
         self
     }
 
-    /// Override the DNS resolver implementation used by the underlying http client.
+    /// Override the DNS resolver implementation used by the underlying http client. If
+    /// [`Self::dns_resolver`] is called directly that will take priority over this, there is no
+    /// need to call both.
+    /// This forces the use of an independent request executor (via [`Self::non_shared`]).
     pub fn no_hickory_dns(mut self) -> Self {
+        self = self.non_shared();
         self.use_secure_dns = false;
         self
     }
@@ -129,7 +141,8 @@ pub struct HickoryDnsResolver {
     // Tokio Runtime in initialization, so we must delay the actual
     // construction of the resolver.
     state: Arc<OnceCell<TokioResolver>>,
-    fallback: Option<Arc<OnceCell<TokioResolver>>>,
+    use_system: Arc<AtomicBool>,
+    system_resolver: Arc<OnceCell<TokioResolver>>,
     static_base: Option<Arc<OnceCell<StaticResolver>>>,
     use_shared: bool,
     /// Overall timeout for dns lookup associated with any individual host resolution. For example,
@@ -141,7 +154,8 @@ impl Default for HickoryDnsResolver {
     fn default() -> Self {
         Self {
             state: Default::default(),
-            fallback: Default::default(),
+            use_system: Arc::new(AtomicBool::new(false)),
+            system_resolver: Default::default(),
             static_base: Some(Default::default()),
             use_shared: true,
             overall_dns_timeout: DEFAULT_OVERALL_LOOKUP_TIMEOUT,
@@ -151,16 +165,28 @@ impl Default for HickoryDnsResolver {
 
 impl Resolve for HickoryDnsResolver {
     fn resolve(&self, name: Name) -> Resolving {
-        let resolver = self.state.clone();
-        let maybe_fallback = self.fallback.clone();
-        let maybe_static = self.static_base.clone();
+        let use_system = self.use_system.load(std::sync::atomic::Ordering::Relaxed);
         let use_shared = self.use_shared;
+        let resolver = if use_system {
+            match self
+                .system_resolver
+                .get_or_try_init(|| HickoryDnsResolver::new_resolver_system(use_shared))
+            {
+                Ok(r) => r.clone(),
+                Err(e) => return Box::pin(return_err(e)),
+            }
+        } else {
+            self.state
+                .get_or_init(|| HickoryDnsResolver::new_resolver(use_shared))
+                .clone()
+        };
+
+        let maybe_static = self.static_base.clone();
         let overall_dns_timeout = self.overall_dns_timeout;
         Box::pin(async move {
             resolve(
                 name,
                 resolver,
-                maybe_fallback,
                 maybe_static,
                 use_shared,
                 overall_dns_timeout,
@@ -171,16 +197,17 @@ impl Resolve for HickoryDnsResolver {
     }
 }
 
+async fn return_err(e: ResolveError) -> Result<Addrs, Box<dyn std::error::Error + Send + Sync>> {
+    Err(Box::new(e) as Box<dyn std::error::Error + Send + Sync>)
+}
+
 async fn resolve(
     name: Name,
-    resolver: Arc<OnceCell<TokioResolver>>,
-    maybe_fallback: Option<Arc<OnceCell<TokioResolver>>>,
+    resolver: TokioResolver,
     maybe_static: Option<Arc<OnceCell<StaticResolver>>>,
     independent: bool,
     overall_dns_timeout: Duration,
 ) -> Result<Addrs, ResolveError> {
-    let resolver = resolver.get_or_init(|| HickoryDnsResolver::new_resolver(independent));
-
     // try checking the static table to see if any of the addresses in the table have been
     // looked up previously within the timeout to where we are not yet ready to try the
     // default resolver yet again.
@@ -214,22 +241,6 @@ async fn resolve(
         }
     };
 
-    // If the primary resolver encountered an error, attempt a lookup using the fallback
-    // resolver if one is configured.
-    if let Some(ref fallback) = maybe_fallback {
-        let resolver =
-            fallback.get_or_try_init(|| HickoryDnsResolver::new_resolver_system(independent))?;
-
-        let resolve_fut =
-            tokio::time::timeout(overall_dns_timeout, resolver.lookup_ip(name.as_str()));
-        if let Ok(Ok(lookup)) = resolve_fut.await {
-            let addrs: Addrs = Box::new(SocketAddrs {
-                iter: lookup.into_iter(),
-            });
-            return Ok(addrs);
-        }
-    }
-
     // If no record has been found and a static map of fallback addresses is configured
     // check the table for our entry
     if let Some(ref static_resolver) = maybe_static {
@@ -258,6 +269,11 @@ impl Iterator for SocketAddrs {
 }
 
 impl HickoryDnsResolver {
+    /// Returns an instance of the shared resolver.
+    pub fn shared() -> Self {
+        SHARED_RESOLVER.clone()
+    }
+
     /// Attempt to resolve a domain name to a set of ['IpAddr']s
     pub async fn resolve_str(
         &self,
@@ -265,10 +281,20 @@ impl HickoryDnsResolver {
     ) -> Result<impl Iterator<Item = IpAddr> + use<>, ResolveError> {
         let n =
             Name::from_str(name).map_err(|_| ResolveError::InvalidNameError(name.to_string()))?;
+        let use_system = self.use_system.load(std::sync::atomic::Ordering::Relaxed);
+        let resolver = if use_system {
+            self.system_resolver
+                .get_or_try_init(|| HickoryDnsResolver::new_resolver_system(self.use_shared))?
+                .clone()
+        } else {
+            self.state
+                .get_or_init(|| HickoryDnsResolver::new_resolver(self.use_shared))
+                .clone()
+        };
+
         resolve(
             n,
-            self.state.clone(),
-            self.fallback.clone(),
+            resolver,
             self.static_base.clone(),
             self.use_shared,
             self.overall_dns_timeout,
@@ -298,13 +324,11 @@ impl HickoryDnsResolver {
     fn new_resolver_system(use_shared: bool) -> Result<TokioResolver, ResolveError> {
         // using a closure here is slightly gross, but this makes sure that if the
         // lazy-init returns an error it can be handled by the client
-        if !use_shared || SHARED_RESOLVER.fallback.is_none() {
+        if !use_shared {
             new_resolver_system()
         } else {
             Ok(SHARED_RESOLVER
-                .fallback
-                .as_ref()
-                .unwrap()
+                .system_resolver
                 .get_or_try_init(new_resolver_system)?
                 .clone())
         }
@@ -320,45 +344,80 @@ impl HickoryDnsResolver {
         }
     }
 
-    /// Enable fallback to the system default resolver if the primary (DoX) resolver fails
-    pub fn enable_system_fallback(&mut self) -> Result<(), ResolveError> {
-        self.fallback = Some(Default::default());
-        let _ = self
-            .fallback
-            .as_ref()
-            .unwrap()
-            .get_or_try_init(new_resolver_system)?;
+    /// Swap the primary internal resolver to the system resolver rather than the
+    /// configured custom resolver.
+    pub fn use_system_resolver(&self) {
+        self.use_system.store(true, Relaxed);
 
-        // IF THIS INSTANCE IS A FRONT FOR THE SHARED RESOLVER SHOULDN'T THIS FN ENABLE THE SYSTEM FALLBACK FOR THE SHARED RESOLVER TOO?
-        // if self.use_shared {
-        //     SHARED_RESOLVER.enable_system_fallback()?;
-        // }
-        Ok(())
+        if self.use_shared {
+            SHARED_RESOLVER.use_system_resolver();
+        }
     }
 
-    /// Disable fallback resolution. If the primary resolver fails the error is
-    /// returned immediately
-    pub fn disable_system_fallback(&mut self) {
-        self.fallback = None;
+    /// Swap the primary internal resolver to the configured custom resolver rather than the
+    /// system resolver.
+    pub fn use_configured_resolver(&self) {
+        self.use_system.store(false, Relaxed);
 
-        // // IF THIS INSTANCE IS A FRONT FOR THE SHARED RESOLVER SHOULDN'T THIS FN ENABLE THE SYSTEM FALLBACK FOR THE SHARED RESOLVER TOO?
-        // if self.use_shared {
-        //     SHARED_RESOLVER.fallback = None;
-        // }
+        if self.use_shared {
+            SHARED_RESOLVER.use_configured_resolver();
+        }
     }
 
-    /// Get the current map of hostname to address in use by the fallback static lookup if one
+    /// Clear entries from the static table that would return entries during the pre-resolve stage.
+    /// This means that all lookups will attempt to use the network resolver again before the static
+    /// table is consulted.
+    ///  
+    /// Entries elevated to pre-resolve from fallback (added from default or using
+    /// [`set_fallback`]`) will have their cache timeout cleared. Entries added directly to
+    /// pre-resolve (using [`Self::set_static_preresolve`]) will be removed.
+    pub fn clear_preresolve(&self) {
+        debug!("clearing pre-resolve table");
+        if let Some(cell) = &self.static_base
+            && let Some(static_base) = cell.get()
+        {
+            static_base.clear_preresolve()
+        }
+    }
+
+    /// Get the current map of hostnames to addresses used in the fallback static lookup stage if one
     /// exists.
     pub fn get_static_fallbacks(&self) -> Option<HashMap<String, Vec<IpAddr>>> {
-        Some(self.static_base.as_ref()?.get()?.get_addrs())
+        Some(self.static_base.as_ref()?.get()?.get_fallback_addrs())
     }
 
     /// Set (or overwrite) the map of addresses used in the fallback static hostname lookup
-    pub fn set_static_fallbacks(&mut self, addrs: HashMap<String, Vec<IpAddr>>) {
-        let cell = OnceCell::new();
-        cell.set(StaticResolver::new(addrs))
-            .expect("infallible assign");
-        self.static_base = Some(Arc::new(cell));
+    pub fn set_fallback_addrs(&mut self, addrs: HashMap<String, Vec<IpAddr>>) {
+        debug!("setting fallback entries for {:?}", addrs.keys());
+        if self.static_base.is_none() {
+            let cell = OnceCell::new();
+            self.static_base = Some(Arc::new(cell));
+        }
+        self.static_base
+            .as_ref()
+            .unwrap()
+            .get_or_init(|| Self::new_static_fallback(self.use_shared))
+            .set_fallback(addrs);
+    }
+
+    /// Get the current map of hostnames to addresses used in the preresolve static lookup stage
+    /// if one exists.
+    pub fn get_static_preresolve(&self) -> Option<HashMap<String, Vec<IpAddr>>> {
+        Some(self.static_base.as_ref()?.get()?.get_preresolve_addrs())
+    }
+
+    /// Set (or overwrite) the map of addresses used in the preresolve static hostname lookup
+    pub fn set_static_preresolve(&mut self, addrs: HashMap<String, Vec<IpAddr>>) {
+        debug!("setting pre-resolve entries for {:?}", addrs.keys());
+        if self.static_base.is_none() {
+            let cell = OnceCell::new();
+            self.static_base = Some(Arc::new(cell));
+        }
+        self.static_base
+            .as_ref()
+            .unwrap()
+            .get_or_init(|| Self::new_static_fallback(self.use_shared))
+            .set_preresolve(addrs);
     }
 
     /// Successfully resolved addresses are cached for a minimum of 30 minutes
@@ -495,7 +554,7 @@ fn new_resolver_system() -> Result<TokioResolver, ResolveError> {
 }
 
 fn new_default_static_fallback() -> StaticResolver {
-    StaticResolver::new(constants::default_static_addrs())
+    StaticResolver::new().with_fallback(constants::default_static_addrs())
 }
 
 /// Do a trial resolution using each nameserver individually to test which are working and which
@@ -532,10 +591,7 @@ mod test {
     use super::*;
     use itertools::Itertools;
     use std::collections::HashMap;
-    use std::{
-        net::{IpAddr, Ipv4Addr, Ipv6Addr},
-        time::Instant,
-    };
+    use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
 
     /// IP addresses guaranteed to fail attempts to resolve
     ///
@@ -552,7 +608,7 @@ mod test {
         let var_name = HickoryDnsResolver::default();
         let resolver = var_name;
         let client = reqwest::ClientBuilder::new()
-            .dns_resolver(resolver.into())
+            .dns_resolver(resolver)
             .build()
             .unwrap();
 
@@ -597,7 +653,7 @@ mod test {
         let example_ip6: IpAddr = "dead::beef".parse().unwrap();
         addr_map.insert(example_domain.to_string(), vec![example_ip4, example_ip6]);
 
-        resolver.set_static_fallbacks(addr_map);
+        resolver.set_fallback_addrs(addr_map);
 
         let mut addrs = resolver.resolve_str(example_domain).await?;
         assert!(addrs.contains(&example_ip4));
@@ -738,18 +794,19 @@ mod test {
         }
 
         #[tokio::test]
-        #[ignore]
-        // this test is dependent of external network setup -- i.e. blocking all traffic to the default
-        // resolvers. Otherwise the default resolvers will succeed without using the static fallback,
-        // making the test pointless
+        #[cfg(any())] // #[ignore] we run --ignore in CI/CD assuming it just means slow -_-
+        // This test impacts the state of the shared resolver and as such is disabled to avoid
+        // interference with other tests.
+        //
+        // this test is dependent of external network setup -- i.e. blocking all traffic to the
+        // default resolvers. Otherwise the default resolvers will succeed without using the static
+        // fallback, making the test pointless
         async fn dns_lookup_failure_on_shared() -> Result<(), ResolveError> {
-            let time_start = Instant::now();
-            let r = OnceCell::new();
-            r.set(build_broken_resolver().expect("failed to build resolver"))
-                .expect("broken resolver init error");
+            let resolver1 = HickoryDnsResolver::shared();
 
-            // create a new resolver that won't mess with the shared resolver used by other tests
-            let resolver = HickoryDnsResolver::default();
+            let time_start = std::time::Instant::now();
+            // create a new resolver that uses the shared resolver
+            let resolver = HickoryDnsResolver::shared();
 
             // successful lookup using fallback to static resolver
             let domain = "rpc.nymtech.net";
@@ -758,9 +815,27 @@ mod test {
                 .await
                 .expect("failed to resolve address in static lookup");
 
-            println!(
-                "{}ms resolved {domain}",
-                (Instant::now() - time_start).as_millis()
+            let lookup_dur = Instant::now() - time_start;
+            assert!(
+                lookup_dur > resolver.overall_dns_timeout,
+                "expected lookup timeout - took {}ms",
+                (lookup_dur).as_millis()
+            );
+
+            let time_start = std::time::Instant::now();
+            // successful lookup using pre-resolve entry promoted from fallback
+            let domain = "rpc.nymtech.net";
+            let _ = resolver1
+                .resolve_str(domain)
+                .await
+                .expect("domain expected to be in pre-resolve");
+
+            // this lookup should basically be instant as we are using pre-resolve
+            let lookup_dur = std::time::Instant::now() - time_start;
+            assert!(
+                lookup_dur < Duration::from_millis(10),
+                "expected instant - took {}ms",
+                (lookup_dur).as_millis()
             );
 
             // unsuccessful lookup - primary times out, and not in static table
@@ -771,5 +846,62 @@ mod test {
             // assert!(result.is_err_and(|e| matches!(e, ResolveError::ResolveError(e) if e.is_nx_domain())));
             Ok(())
         }
+
+        #[tokio::test]
+        #[cfg(any())] // #[ignore] we run --ignore in CI/CD assuming it just means slow -_-
+        // This test impacts the state of the shared resolver and as such is disabled to avoid
+        // interference with other tests.
+        async fn setting_dns_fallbacks_with_shared_resolver() -> Result<(), ResolveError> {
+            let resolver1 = HickoryDnsResolver::shared();
+
+            // create a new resolver that uses the shared resolver
+            let mut resolver = HickoryDnsResolver::shared();
+
+            let example_domains = [
+                String::from("static1.nymvpn.com"),
+                String::from("static2.nymvpn.com"),
+            ];
+            let mut addr_map1 = HashMap::new();
+            addr_map1.insert(
+                example_domains[0].clone(),
+                vec![Ipv4Addr::new(10, 10, 10, 10).into()],
+            );
+            addr_map1.insert(
+                example_domains[1].clone(),
+                vec![Ipv4Addr::new(1, 1, 1, 1).into()],
+            );
+
+            resolver.set_static_preresolve(addr_map1);
+
+            let time_start = std::time::Instant::now();
+            // successful lookup using pre-resolve entry promoted from fallback
+            let _ = resolver1
+                .resolve_str(&example_domains[0])
+                .await
+                .expect("domain expected to be in pre-resolve");
+
+            // this lookup should basically be instant as we are using pre-resolve
+            let lookup_dur = std::time::Instant::now() - time_start;
+            assert!(
+                lookup_dur < Duration::from_millis(10),
+                "expected instant - took {}ms",
+                (lookup_dur).as_millis()
+            );
+
+            // After clearing the pre-resolve in one instance of the shared resolver ...
+            resolver.clear_preresolve();
+
+            // ... other instances have their pre-resolve entries cleared.
+            let prereslve_lookup = resolver1
+                .static_base
+                .as_ref()
+                .unwrap()
+                .get()
+                .unwrap()
+                .pre_resolve(&example_domains[0]);
+            assert!(prereslve_lookup.is_none());
+
+            Ok(())
+        }
     }
 }

common/http-api-client/src/dns/constants.rs

@@ -51,6 +51,9 @@ pub const VERCEL_COM_IPS: &[IpAddr] = &[
     IpAddr::V4(Ipv4Addr::new(198, 169, 1, 193)),
 ];
 
+pub const NYM_API_CDN: &str = "cdn1.media-platform.net";
+pub const NYM_API_CDN_IPS: &[IpAddr] = &[IpAddr::V4(Ipv4Addr::new(172, 104, 178, 252))];
+
 pub const NYM_COM_DOMAIN: &str = "nym.com";
 pub const NYM_COM_IPS: &[IpAddr] = &[IpAddr::V4(Ipv4Addr::new(76, 76, 21, 22))];
 
@@ -69,6 +72,12 @@ pub const NYM_RPC_IPS: &[IpAddr] = &[
     )),
 ];
 
+#[allow(unused)]
+pub fn empty_static_addrs() -> HashMap<String, Vec<IpAddr>> {
+    HashMap::new()
+}
+
+#[allow(unused)]
 pub fn default_static_addrs() -> HashMap<String, Vec<IpAddr>> {
     let mut m = HashMap::new();
     m.insert(NYM_API_DOMAIN.to_string(), NYM_API_IPS.to_vec());
@@ -88,6 +97,7 @@ pub fn default_static_addrs() -> HashMap<String, Vec<IpAddr>> {
     m.insert(YELP_FASTLY_DOMAIN.to_string(), YELP_FASTLY_IPS.to_vec());
     m.insert(VERCEL_APP_DOMAIN.to_string(), VERCEL_APP_IPS.to_vec());
     m.insert(VERCEL_COM_DOMAIN.to_string(), VERCEL_COM_IPS.to_vec());
+    m.insert(NYM_API_CDN.to_string(), NYM_API_CDN_IPS.to_vec());
     m.insert(NYM_COM_DOMAIN.to_string(), NYM_COM_IPS.to_vec());
     m.insert(NYM_STATS_API_DOMAIN.to_string(), NYM_STATS_API_IPS.to_vec());
     m.insert(NYM_RPC_DOMAIN.to_string(), NYM_RPC_IPS.to_vec());

common/http-api-client/src/dns/static_resolver.rs

@@ -14,42 +14,78 @@ const DEFAULT_PRE_RESOLVE_TIMEOUT: Duration = super::DEFAULT_POSITIVE_LOOKUP_CAC
 
 #[derive(Debug, Default, Clone)]
 pub struct StaticResolver {
-    static_addr_map: Arc<Mutex<HashMap<String, Entry>>>,
+    fallback_addr_map: Arc<Mutex<HashMap<String, Vec<IpAddr>>>>,
+    preresolve_addr_map: Arc<Mutex<HashMap<String, Entry>>>,
     pre_resolve_timeout: Option<Duration>,
 }
 
+#[derive(Debug, Clone, Default)]
+enum PreResolveStatus {
+    #[default]
+    Valid,
+    ValidUntil(Instant),
+}
+
 #[derive(Debug, Clone, Default)]
 struct Entry {
-    valid_for_pre_resolve_until: Option<Instant>,
+    status: PreResolveStatus,
     addrs: Vec<IpAddr>,
 }
 
 impl Entry {
     fn new(addrs: Vec<IpAddr>) -> Self {
         Self {
-            valid_for_pre_resolve_until: None,
+            status: PreResolveStatus::Valid,
             addrs,
         }
     }
+
+    fn new_timeout(addrs: Vec<IpAddr>, timeout: Duration) -> Self {
+        Self {
+            status: PreResolveStatus::ValidUntil(Instant::now() + timeout),
+            addrs,
+        }
+    }
+
+    fn is_valid(&self) -> bool {
+        match self.status {
+            PreResolveStatus::Valid => true,
+            PreResolveStatus::ValidUntil(t) => t > Instant::now(),
+        }
+    }
 }
 
 impl StaticResolver {
-    pub fn new(static_entries: HashMap<String, Vec<IpAddr>>) -> StaticResolver {
-        debug!("building static resolver");
-        let static_entries = static_entries
-            .into_iter()
-            .map(|(name, ips)| (name, Entry::new(ips)))
-            .collect();
+    pub fn new() -> StaticResolver {
         Self {
-            static_addr_map: Arc::new(Mutex::new(static_entries)),
+            fallback_addr_map: Arc::new(Mutex::new(HashMap::new())),
+            preresolve_addr_map: Arc::new(Mutex::new(HashMap::new())),
             pre_resolve_timeout: Some(DEFAULT_PRE_RESOLVE_TIMEOUT),
         }
     }
 
-    /// Return the full set of domain names and associated addresses stored in this static lookup table
-    pub fn get_addrs(&self) -> HashMap<String, Vec<IpAddr>> {
+    /// Initialize the contents of the pre-resolve table for this instance of the static resolver
+    #[allow(unused)]
+    pub fn with_preresolve(mut self, entries: HashMap<String, Vec<IpAddr>>) -> Self {
+        let entries = entries
+            .into_iter()
+            .map(|(name, ips)| (name, Entry::new(ips)))
+            .collect();
+        self.preresolve_addr_map = Arc::new(Mutex::new(entries));
+        self
+    }
+
+    /// Initialize the contenes of the fallback table for this instance of the static resolver
+    pub fn with_fallback(mut self, entries: HashMap<String, Vec<IpAddr>>) -> Self {
+        self.fallback_addr_map = Arc::new(Mutex::new(entries));
+        self
+    }
+
+    /// Return the set of domain names and associated addresses stored in the pre-resolve static
+    /// lookup table
+    pub fn get_preresolve_addrs(&self) -> HashMap<String, Vec<IpAddr>> {
         let mut out = HashMap::new();
-        self.static_addr_map
+        self.preresolve_addr_map
             .lock()
             .unwrap()
             .iter()
@@ -59,6 +95,38 @@ impl StaticResolver {
         out
     }
 
+    /// Return the set of domain names and associated addresses stored in the fallback static lookup
+    /// table
+    pub fn get_fallback_addrs(&self) -> HashMap<String, Vec<IpAddr>> {
+        self.fallback_addr_map.lock().unwrap().clone()
+    }
+
+    /// Set (or overwrite) the map of static addresses to be returned only after attempting a lookup
+    /// over the network resolver.
+    pub fn set_fallback(&self, addrs: HashMap<String, Vec<IpAddr>>) {
+        self.fallback_addr_map.lock().unwrap().extend(addrs);
+    }
+
+    /// Clear entries from the static table that would return entries during the pre-resolve stage.
+    /// This means that all lookups will attempt to use the network resolver again before the static
+    /// table is consulted.
+    ///  
+    /// Entries elevated to pre-resolve from fallback (added from default or using
+    /// [`set_fallback`]`) will have their cache timeout cleared. Entries added directly to
+    /// pre-resolve (using [`Self::preresolve_to_addrs`]) will be removed.
+    pub fn clear_preresolve(&self) {
+        *self.preresolve_addr_map.lock().unwrap() = HashMap::new();
+    }
+
+    /// Set (or overwrite) the map of static addresses and mark these domains to be returned
+    /// WITHOUT attempting a lookup over the network resolver.
+    pub fn set_preresolve(&self, addrs: HashMap<String, Vec<IpAddr>>) {
+        let mut current_map = self.preresolve_addr_map.lock().unwrap();
+        for (domain, ips) in addrs.into_iter() {
+            _ = current_map.insert(domain, Entry::new(ips))
+        }
+    }
+
     /// Change the timeout for which domains can be pre-resolved after they are looked up in the
     /// static lookup table.
     #[allow(unused)]
@@ -71,44 +139,58 @@ impl StaticResolver {
     /// recently (within the configured timeout) looked it up previously in this static table using
     /// a regular resolve.
     pub fn pre_resolve(&self, name: &str) -> Option<Vec<IpAddr>> {
-        debug!("found {name:?} in pre-resolve static table resolver");
-
-        self.pre_resolve_timeout?;
-
-        self.static_addr_map
+        self.preresolve_addr_map
             .lock()
             .unwrap()
             .get(name)
-            .filter(|e| {
-                e.valid_for_pre_resolve_until
-                    .is_some_and(|t| t > Instant::now())
+            .filter(|entry| entry.is_valid())
+            .map(|entry| {
+                debug!("pre-resolve lookup hit for \"{name:?}\" in static table resolver");
+                entry.addrs.clone()
             })
-            .map(|e| e.addrs.clone())
     }
 
     #[allow(unused)]
     pub fn resolve_str(&self, name: &str) -> Option<Vec<IpAddr>> {
         Self::resolve_inner(
-            self.static_addr_map.lock().unwrap(),
+            self.fallback_addr_map.lock().unwrap(),
+            self.preresolve_addr_map.lock().unwrap(),
             name,
             self.pre_resolve_timeout,
         )
-        .map(|e| e.addrs)
     }
 
     fn resolve_inner(
-        mut table: MutexGuard<'_, HashMap<String, Entry>>,
+        fallback_table: MutexGuard<'_, HashMap<String, Vec<IpAddr>>>,
+        mut preresolve_table: MutexGuard<'_, HashMap<String, Entry>>,
         name: &str,
-        timeout: Option<Duration>,
-    ) -> Option<Entry> {
-        let resolved = table.get_mut(name)?;
+        pre_resolve_cache_timeout: Option<Duration>,
+    ) -> Option<Vec<IpAddr>> {
+        let resolved = fallback_table.get(name)?;
 
-        debug!("found {name:?} in static table resolver");
+        debug!("lookup hit for \"{name:?}\" in static table resolver");
 
-        if let Some(pre_resolve_timeout) = timeout {
-            // We had to look this entry up and a pre-resolve duration is defined, so it will
-            // trigger in pre-resolve lookups for the next _timeout_ window.
-            resolved.valid_for_pre_resolve_until = Some(Instant::now() + pre_resolve_timeout);
+        // We had to look this entry up and a pre-resolve duration is defined, so it will
+        // trigger in pre-resolve lookups for the next _timeout_ window if it wasn't already
+        // triggering.
+        if let Some(pre_resolve_timeout) = pre_resolve_cache_timeout {
+            match preresolve_table.get_mut(name) {
+                None => {
+                    _ = preresolve_table.insert(
+                        name.to_string(),
+                        Entry::new_timeout(resolved.clone(), pre_resolve_timeout),
+                    );
+                }
+                // Not sure how we would get cases where this is Some( ) -- it requires having a
+                // Valid entry in the preresolve table and still doing a lookup against fallback.
+                Some(entry) if matches!(entry.status, PreResolveStatus::ValidUntil(_)) => {
+                    _ = preresolve_table.insert(
+                        name.to_string(),
+                        Entry::new_timeout(resolved.clone(), pre_resolve_timeout),
+                    );
+                }
+                _ => {}
+            }
         }
         Some(resolved.clone())
     }
@@ -117,13 +199,23 @@ impl StaticResolver {
 impl Resolve for StaticResolver {
     fn resolve(&self, name: Name) -> Resolving {
         debug!("looking up {name:?} in static resolver");
-        let addr_map = self.static_addr_map.clone();
+        // these should clone arcs, not the actual tables
+        let fallback_addr_map = self.fallback_addr_map.clone();
+        let presesolve_addr_map = self.preresolve_addr_map.clone();
         let timeout = self.pre_resolve_timeout;
+        // Also the returned future doesn't try to take the lock on the tables until the
+        // future is awaited, so no blocking issues.
         Box::pin(async move {
-            let addr_map = addr_map.lock().unwrap();
-            let lookup = match Self::resolve_inner(addr_map, name.as_str(), timeout) {
+            let fallback_addr_map = fallback_addr_map.lock().unwrap();
+            let presesolve_addr_map = presesolve_addr_map.lock().unwrap();
+            let lookup = match Self::resolve_inner(
+                fallback_addr_map,
+                presesolve_addr_map,
+                name.as_str(),
+                timeout,
+            ) {
                 None => return Err(ResolveError::StaticLookupMiss.into()),
-                Some(entry) => entry.addrs,
+                Some(addrs) => addrs,
             };
             let addrs: Addrs = Box::new(
                 lookup
@@ -142,6 +234,7 @@ mod test {
 
     use super::*;
     use std::error::Error as StdError;
+    use std::net::Ipv4Addr;
     use std::str::FromStr;
 
     #[tokio::test]
@@ -149,7 +242,7 @@ mod test {
         let example_domain = String::from("static.nymvpn.com");
 
         // lookup for domain for which there is no entry
-        let resolver = StaticResolver::new(HashMap::new());
+        let resolver = StaticResolver::new();
 
         let url = reqwest::dns::Name::from_str(&example_domain).unwrap();
         let result = resolver.resolve(url).await;
@@ -166,7 +259,7 @@ mod test {
         addr_map.insert(example_domain.clone(), vec![example_ip4, example_ip6]);
 
         let url = reqwest::dns::Name::from_str(&example_domain).unwrap();
-        let resolver = StaticResolver::new(addr_map);
+        let resolver = StaticResolver::new().with_fallback(addr_map);
         let mut addrs = resolver.resolve(url).await?;
         assert!(addrs.contains(&SocketAddr::new(example_ip4, 0)));
         assert!(addrs.contains(&SocketAddr::new(example_ip6, 0)));
@@ -175,7 +268,7 @@ mod test {
     }
 
     #[test]
-    fn static_lookup_pre_resolve() {
+    fn elevate_fallback_to_pre_resolve() {
         let example_duration = Duration::from_secs(3);
         let example_domain = String::from("static.nymvpn.com");
         let mut addr_map = HashMap::new();
@@ -183,24 +276,23 @@ mod test {
         let example_ip6: IpAddr = "dead::beef".parse().unwrap();
         addr_map.insert(example_domain.clone(), vec![example_ip4, example_ip6]);
 
-        let resolver = StaticResolver::new(addr_map).with_pre_resolve_timeout(example_duration);
+        let resolver = StaticResolver::new()
+            .with_fallback(addr_map)
+            .with_pre_resolve_timeout(example_duration);
 
         // ensure that attempting to pre-resolve without first resolving returns none
         let result = resolver.pre_resolve(&example_domain);
         assert!(result.is_none());
 
         // resolving should now update the pre-resolve validity timeout for the entry
-        let entry = StaticResolver::resolve_inner(
-            resolver.static_addr_map.lock().unwrap(),
-            &example_domain,
-            Some(example_duration),
-        )
-        .expect("missing entry???!!!!");
-        assert!(
-            entry
-                .valid_for_pre_resolve_until
-                .is_some_and(|t| t < Instant::now() + example_duration)
-        );
+        let _addrs = resolver
+            .resolve_str(&example_domain)
+            .expect("entry should exist");
+        assert!(matches!(
+            resolver.preresolve_status(&example_domain),
+            Some(PreResolveStatus::ValidUntil(t))
+                if t < Instant::now() + example_duration
+        ));
 
         // check that pre-resolve now returns the expected record
         let addrs = resolver
@@ -214,4 +306,139 @@ mod test {
         let result = resolver.pre_resolve(&example_domain);
         assert!(result.is_none());
     }
+
+    #[test]
+    fn set_and_use_preresolve() {
+        let example_duration = Duration::from_secs(3);
+        let example_domains = [
+            String::from("static1.nymvpn.com"),
+            String::from("static2.nymvpn.com"),
+            String::from("preresolve.nymvpn.com"),
+        ];
+        let mut addr_map1 = HashMap::new();
+        addr_map1.insert(
+            example_domains[0].clone(),
+            vec![Ipv4Addr::new(10, 10, 10, 10).into()],
+        );
+        addr_map1.insert(
+            example_domains[1].clone(),
+            vec![Ipv4Addr::new(1, 1, 1, 1).into()],
+        );
+
+        let mut addr_map2 = HashMap::new();
+        addr_map2.insert(
+            example_domains[1].clone(),
+            vec![Ipv4Addr::new(1, 1, 1, 1).into()],
+        );
+        addr_map2.insert(
+            example_domains[2].clone(),
+            vec![Ipv4Addr::new(8, 8, 8, 8).into()],
+        );
+
+        let resolver = StaticResolver::new()
+            .with_fallback(addr_map1)
+            .with_pre_resolve_timeout(example_duration);
+
+        // Attempting to pre-resolve without setting the table returns none
+        let result = resolver.pre_resolve(&example_domains[0]);
+        assert!(result.is_none());
+
+        resolver.set_preresolve(addr_map2);
+
+        // After setting the pre-resolve, addresses in the the table are returned
+        let result = resolver.pre_resolve(&example_domains[1]);
+        assert!(result.is_some());
+
+        // If the domain wasn't in the pre-resolve table it returns none.
+        let result = resolver.pre_resolve(&example_domains[0]);
+        assert!(result.is_none());
+
+        resolver.clear_preresolve();
+    }
+
+    #[test]
+    fn preresolve_with_fallback() {
+        let example_duration = Duration::from_secs(3);
+        let example_domains = [
+            String::from("static1.nymvpn.com"),
+            String::from("static2.nymvpn.com"),
+            String::from("preresolve.nymvpn.com"),
+        ];
+        let mut addr_map1 = HashMap::new();
+        addr_map1.insert(
+            example_domains[0].clone(),
+            vec![Ipv4Addr::new(10, 10, 10, 10).into()],
+        );
+        addr_map1.insert(
+            example_domains[1].clone(),
+            vec![Ipv4Addr::new(1, 1, 1, 1).into()],
+        );
+
+        let mut addr_map2 = HashMap::new();
+        addr_map2.insert(
+            example_domains[1].clone(),
+            vec![Ipv4Addr::new(1, 1, 1, 1).into()],
+        );
+        addr_map2.insert(
+            example_domains[2].clone(),
+            vec![Ipv4Addr::new(8, 8, 8, 8).into()],
+        );
+
+        let resolver = StaticResolver::new()
+            .with_fallback(addr_map1)
+            .with_preresolve(addr_map2)
+            .with_pre_resolve_timeout(example_duration);
+
+        // when using both pre-resolve and fallback elevating entries from fallback to pre-resolve
+        // leaves the entries as `Valid`.
+        assert!(matches!(
+            resolver.preresolve_status(&example_domains[1]),
+            Some(PreResolveStatus::Valid)
+        ));
+        let _addrs = resolver
+            .resolve_str(&example_domains[1])
+            .expect("entry should exist");
+        assert!(matches!(
+            resolver.preresolve_status(&example_domains[1]),
+            Some(PreResolveStatus::Valid)
+        ));
+
+        // entries not already in pre-resolve get elevated with a timeout.
+        assert!(!resolver.preresolve_contains(&example_domains[0]));
+        let _addrs = resolver
+            .resolve_str(&example_domains[0])
+            .expect("entry should exist");
+        assert!(resolver.preresolve_contains(&example_domains[0]));
+        assert!(matches!(
+            resolver.preresolve_status(&example_domains[0]),
+            Some(PreResolveStatus::ValidUntil(_))
+        ));
+
+        // clearing the pre-resolve table doesn't impact the fallback table.
+        resolver.clear_preresolve();
+        assert!(!resolver.preresolve_contains(&example_domains[0]));
+        assert!(!resolver.preresolve_contains(&example_domains[1]));
+        assert!(!resolver.preresolve_contains(&example_domains[2]));
+        assert!(!resolver.fallback_contains(&example_domains[0]));
+        assert!(!resolver.fallback_contains(&example_domains[1]));
+    }
+
+    /// convenience functions for testing
+    impl StaticResolver {
+        fn preresolve_status(&self, name: &str) -> Option<PreResolveStatus> {
+            self.preresolve_addr_map
+                .lock()
+                .unwrap()
+                .get(name)
+                .map(|e| e.status.clone())
+        }
+
+        fn preresolve_contains(&self, name: &str) -> bool {
+            self.preresolve_addr_map.lock().unwrap().contains_key(name)
+        }
+
+        fn fallback_contains(&self, name: &str) -> bool {
+            self.preresolve_addr_map.lock().unwrap().contains_key(name)
+        }
+    }
 }

common/http-api-client/src/fronted.rs

@@ -3,15 +3,21 @@
 
 //! Utilities for and implementation of request tunneling
 
-use std::sync::atomic::{AtomicBool, Ordering};
+use std::sync::{
+    Arc, LazyLock, RwLock,
+    atomic::{AtomicBool, Ordering},
+};
 use tracing::warn;
 
-use crate::ClientBuilder;
+use crate::{Client, ClientBuilder};
+
+static SHARED_FRONTING_POLICY: LazyLock<Arc<RwLock<FrontPolicy>>> =
+    LazyLock::new(|| Arc::new(RwLock::new(FrontPolicy::Off)));
 
 // #[cfg(feature = "tunneling")]
 #[derive(Debug)]
 pub(crate) struct Front {
-    pub(crate) policy: FrontPolicy,
+    pub(crate) policy: Arc<RwLock<FrontPolicy>>,
     enabled: AtomicBool,
 }
 
@@ -19,7 +25,7 @@ impl Clone for Front {
     fn clone(&self) -> Self {
         Self {
             policy: self.policy.clone(),
-            enabled: AtomicBool::new(self.enabled.load(Ordering::Relaxed)),
+            enabled: AtomicBool::new(false),
         }
     }
 }
@@ -27,13 +33,30 @@ impl Clone for Front {
 impl Front {
     pub(crate) fn new(policy: FrontPolicy) -> Self {
         Self {
-            enabled: AtomicBool::new(policy == FrontPolicy::Always),
+            enabled: AtomicBool::new(false),
+            policy: Arc::new(RwLock::new(policy)),
+        }
+    }
+
+    pub(crate) fn off() -> Self {
+        Self::new(FrontPolicy::Off)
+    }
+
+    pub(crate) fn shared() -> Self {
+        let policy = SHARED_FRONTING_POLICY.clone();
+        Self {
+            enabled: AtomicBool::new(false),
             policy,
         }
     }
 
+    pub(crate) fn set_policy(&self, policy: FrontPolicy) {
+        *self.policy.write().unwrap() = policy;
+        self.enabled.store(false, Ordering::Relaxed);
+    }
+
     pub(crate) fn is_enabled(&self) -> bool {
-        match self.policy {
+        match *self.policy.read().unwrap() {
             FrontPolicy::Off => false,
             FrontPolicy::OnRetry => self.enabled.load(Ordering::Relaxed),
             FrontPolicy::Always => true,
@@ -46,14 +69,13 @@ impl Front {
         if self.is_enabled() {
             return;
         }
-        if matches!(self.policy, FrontPolicy::OnRetry) {
+        if matches!(*self.policy.read().unwrap(), FrontPolicy::OnRetry) {
             self.enabled.store(true, Ordering::Relaxed);
         }
     }
 }
 
 #[derive(Debug, Default, PartialEq, Clone)]
-#[cfg(feature = "tunneling")]
 /// Policy for when to use domain fronting for HTTP requests.
 pub enum FrontPolicy {
     /// Always use domain fronting for all requests.
@@ -66,29 +88,208 @@ pub enum FrontPolicy {
 }
 
 impl ClientBuilder {
-    /// Enable and configure request tunneling for API requests.
-    #[cfg(feature = "tunneling")]
-    pub fn with_fronting(mut self, policy: FrontPolicy) -> Self {
-        let front = Front::new(policy);
+    /// Enable and configure request tunneling for API requests. If no front policy is
+    /// provided the shared fronting policy will be used.
+    pub fn with_fronting(mut self, policy: Option<FrontPolicy>) -> Self {
+        let front = if let Some(p) = policy {
+            Front::new(p)
+        } else {
+            Front::shared()
+        };
 
         // Check if any of the supplied urls even support fronting
         if !self.urls.iter().any(|url| url.has_front()) {
             warn!(
-                "fronting is enabled, but none of the supplied urls have configured fronting domains"
+                "fronting is enabled, but none of the supplied urls have configured fronting domains: {:?}",
+                self.urls
             );
         }
 
-        self.front = Some(front);
+        self.front = front;
 
         self
     }
 }
 
+impl Client {
+    /// Set the policy for enabling fronting. If fronting was previously unset this will set it, and
+    /// make it possible to enable (i.e [`FrontPolicy::Off`] will not enable it).
+    ///
+    /// Calling this function sets a custom policy for this client, disconnecting it from the shared
+    /// fronting policy -- i.e. changes applied through [`Client::set_shared_front_policy`] will not
+    /// be impact this client.
+    pub fn set_front_policy(&mut self, policy: FrontPolicy) {
+        self.front.set_policy(policy)
+    }
+
+    /// Set the fronting policy for this client to follow the shared policy.
+    pub fn use_shared_front_policy(&mut self) {
+        self.front = Front::shared();
+    }
+
+    /// Set the fronting policy for all clients using the shared policy.
+    //
+    // NOTE: this does not reset the per-instance enabled flag like it will when using
+    // [`Front::set_front_policy`]. So if a client is using shared policy with the `OnRetry` policy
+    // and this function is used to swap that policy away from and then back to `OnRetry` the
+    // fronting will still be enabled. Noting this here just in case this triggers any corner cases
+    // down the road.
+    pub fn set_shared_front_policy(policy: FrontPolicy) {
+        *SHARED_FRONTING_POLICY.write().unwrap() = policy;
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
     use crate::{ApiClientCore, NO_PARAMS, Url};
 
+    impl Front {
+        pub(crate) fn policy(&self) -> FrontPolicy {
+            self.policy.read().unwrap().clone()
+        }
+    }
+
+    /// Policy can be set for an independent client and the update is applied properly
+    #[test]
+    fn set_policy_independent_client() {
+        let url1 = Url::new(
+            "https://validator.global.ssl.fastly.net",
+            Some(vec!["https://yelp.global.ssl.fastly.net"]),
+        )
+        .unwrap();
+
+        let mut client1 = ClientBuilder::new(url1.clone())
+            .unwrap()
+            .with_fronting(Some(FrontPolicy::Off))
+            .build()
+            .unwrap();
+        assert!(client1.front.policy() == FrontPolicy::Off);
+
+        let client2 = ClientBuilder::new(url1.clone())
+            .unwrap()
+            .with_fronting(Some(FrontPolicy::OnRetry))
+            .build()
+            .unwrap();
+
+        // Ensure that setting the policy for a client it gets properly applied.
+        client1.set_front_policy(FrontPolicy::Always);
+        assert!(client1.front.policy() == FrontPolicy::Always);
+
+        // ensure that setting the policy in a client NOT using the shared policy does NOT update
+        // the policy used by another client.
+        assert!(client2.front.policy() == FrontPolicy::OnRetry);
+
+        // Ensure that the policy takes effect and is applied when setting host headers on outgoing
+        // requests
+        let req = client1
+            .create_request(reqwest::Method::GET, &["/"], NO_PARAMS, None::<&()>)
+            .unwrap()
+            .build()
+            .unwrap();
+
+        let expected_host = url1.host_str().unwrap();
+        assert!(
+            req.headers()
+                .get(reqwest::header::HOST)
+                .is_some_and(|h| h.to_str().unwrap() == expected_host),
+            "{:?} != {:?}",
+            expected_host,
+            req,
+        );
+
+        let expected_front = url1.front_str().unwrap();
+        assert!(
+            req.url()
+                .host()
+                .is_some_and(|url| url.to_string() == expected_front),
+            "{:?} != {:?}",
+            expected_front,
+            req,
+        );
+    }
+
+    /// Policy can be set for the shared client and the update is applied properly
+    // NOTE THIS TEST IS DISABLED BECAUSE IT INTERACTS WITH THE SHARED POLICY AND AS SUCH CAN HAVE
+    // AN IMPACT ON OTHER TESTS
+    #[test]
+    #[cfg(any())] // #[ignore] we run --ignore in CI/CD assuming it just means slow -_-
+    fn set_policy_shared_client() {
+        let url1 = Url::new(
+            "https://validator.global.ssl.fastly.net",
+            Some(vec!["https://yelp.global.ssl.fastly.net"]),
+        )
+        .unwrap();
+
+        Client::set_shared_front_policy(FrontPolicy::Off);
+        assert!(*SHARED_FRONTING_POLICY.read().unwrap() == FrontPolicy::Off);
+
+        let client1 = ClientBuilder::new(url1.clone())
+            .unwrap()
+            .with_fronting(None)
+            .build()
+            .unwrap();
+        assert!(client1.front.policy() == FrontPolicy::Off);
+
+        let mut client2 = ClientBuilder::new(url1.clone())
+            .unwrap()
+            .with_fronting(Some(FrontPolicy::Off))
+            .build()
+            .unwrap();
+
+        // Ensure that setting the shared policy gets properly applied
+        Client::set_shared_front_policy(FrontPolicy::Always);
+        assert!(client1.front.policy() == FrontPolicy::Always);
+
+        // Setting the shared policy should NOT update clients NOT using the shared policy.
+        assert!(client2.front.policy() == FrontPolicy::Off);
+
+        // Ensure that the policy takes effect and is applied when setting host headers on outgoing
+        // requests
+        let req = client1
+            .create_request(reqwest::Method::GET, &["/"], NO_PARAMS, None::<&()>)
+            .unwrap()
+            .build()
+            .unwrap();
+
+        let expected_host = url1.host_str().unwrap();
+        assert!(
+            req.headers()
+                .get(reqwest::header::HOST)
+                .is_some_and(|h| h.to_str().unwrap() == expected_host),
+            "{:?} != {:?}",
+            expected_host,
+            req,
+        );
+
+        let expected_front = url1.front_str().unwrap();
+        assert!(
+            req.url()
+                .host()
+                .is_some_and(|url| url.to_string() == expected_front),
+            "{:?} != {:?}",
+            expected_front,
+            req,
+        );
+
+        // ensure that setting to the shared policy works
+        client2.use_shared_front_policy();
+        assert!(client2.front.policy() == FrontPolicy::Always);
+
+        // ensure that if the policy is OnRetry then the `enabled` fields are still independent,
+        // despite the policy being shared.
+        Client::set_shared_front_policy(FrontPolicy::OnRetry);
+        assert!(client1.front.policy() == FrontPolicy::OnRetry);
+        assert!(client2.front.policy() == FrontPolicy::OnRetry);
+
+        assert!(!client1.front.is_enabled());
+        assert!(!client2.front.is_enabled());
+
+        client1.front.retry_enable();
+        assert!(client1.front.is_enabled());
+        assert!(!client2.front.is_enabled());
+    }
+
     #[tokio::test]
     async fn nym_api_works() {
         let url1 = Url::new(
@@ -104,7 +305,7 @@ mod tests {
 
         let client = ClientBuilder::new(url1)
             .expect("bad url")
-            .with_fronting(FrontPolicy::Always)
+            .with_fronting(Some(FrontPolicy::Always))
             .build()
             .expect("failed to build client");
 
@@ -140,7 +341,7 @@ mod tests {
 
         let client = ClientBuilder::new_with_urls(vec![url1, url2])
             .expect("bad url")
-            .with_fronting(FrontPolicy::Always)
+            .with_fronting(Some(FrontPolicy::Always))
             .build()
             .expect("failed to build client");
 

common/http-api-client/src/lib.rs

@@ -136,6 +136,7 @@
 //! ```
 #![warn(missing_docs)]
 
+use http::header::USER_AGENT;
 pub use inventory;
 pub use reqwest;
 pub use reqwest::ClientBuilder as ReqwestClientBuilder;
@@ -147,6 +148,7 @@ pub mod registry;
 use crate::path::RequestPath;
 use async_trait::async_trait;
 use bytes::Bytes;
+use cfg_if::cfg_if;
 use http::HeaderMap;
 use http::header::{ACCEPT, CONTENT_TYPE};
 use itertools::Itertools;
@@ -161,9 +163,7 @@ use std::time::Duration;
 use thiserror::Error;
 use tracing::{debug, instrument, warn};
 
-#[cfg(not(target_arch = "wasm32"))]
-use std::net::SocketAddr;
-use std::sync::Arc;
+use std::sync::{Arc, LazyLock};
 
 #[cfg(feature = "tunneling")]
 mod fronted;
@@ -195,6 +195,8 @@ use nym_http_api_client_macro::client_defaults;
 /// high and chatty protocols take a while to complete.
 pub const DEFAULT_TIMEOUT: Duration = Duration::from_secs(30);
 
+const NYM_OUTER_SNI_HEADER: &str = "NYM-ORIGINAL-OUTER-SNI";
+
 #[cfg(not(target_arch = "wasm32"))]
 client_defaults!(
     priority = -100;
@@ -206,6 +208,24 @@ client_defaults!(
     user_agent = format!("nym-http-api-client/{}", env!("CARGO_PKG_VERSION"))
 );
 
+static SHARED_CLIENT: LazyLock<reqwest::Client> = LazyLock::new(|| {
+    tracing::info!("Initializing shared HTTP client");
+    cfg_if! {
+        if #[cfg(target_arch = "wasm32")] {
+            reqwest::ClientBuilder::new().build()
+                .expect("failed to initialize shared http client")
+        } else {
+            let mut builder = default_builder();
+
+            builder = builder.dns_resolver(Arc::new(HickoryDnsResolver::default()));
+
+            builder
+                .build()
+                .expect("failed to initialize shared http client")
+        }
+    }
+});
+
 /// Collection of URL Path Segments
 pub type PathSegments<'a> = &'a [&'a str];
 /// Collection of HTTP Request Parameters
@@ -327,16 +347,22 @@ pub enum HttpClientError {
         source: reqwest::Error,
     },
 
+    #[error("failed to parse header value: {source}")]
+    InvalidHeaderValue {
+        #[source]
+        source: http::Error,
+    },
+
     #[error("failed to send request for {url}: {source}")]
     RequestSendFailure {
-        url: reqwest::Url,
+        url: Box<reqwest::Url>,
         #[source]
         source: ReqwestErrorWrapper,
     },
 
     #[error("failed to read response body from {url}: {source}")]
     ResponseReadFailure {
-        url: reqwest::Url,
+        url: Box<reqwest::Url>,
         headers: Box<HeaderMap>,
         status: StatusCode,
         #[source]
@@ -353,7 +379,7 @@ pub enum HttpClientError {
     },
 
     #[error("the requested resource could not be found at {url}")]
-    NotFound { url: reqwest::Url },
+    NotFound { url: Box<reqwest::Url> },
 
     #[error("attempted to use domain fronting and clone a request containing stream data")]
     AttemptedToCloneStreamRequest,
@@ -365,7 +391,7 @@ pub enum HttpClientError {
         "the request for {url} failed with status '{status}'. no additional error message provided. response headers: {headers:?}"
     )]
     RequestFailure {
-        url: reqwest::Url,
+        url: Box<reqwest::Url>,
         status: StatusCode,
         headers: Box<HeaderMap>,
     },
@@ -374,7 +400,7 @@ pub enum HttpClientError {
         "the returned response from {url} was empty. status: '{status}'. response headers: {headers:?}"
     )]
     EmptyResponse {
-        url: reqwest::Url,
+        url: Box<reqwest::Url>,
         status: StatusCode,
         headers: Box<HeaderMap>,
     },
@@ -383,7 +409,7 @@ pub enum HttpClientError {
         "failed to resolve request for {url}. status: '{status}'. response headers: {headers:?}. additional error message: {error}"
     )]
     EndpointFailure {
-        url: reqwest::Url,
+        url: Box<reqwest::Url>,
         status: StatusCode,
         headers: Box<HeaderMap>,
         error: String,
@@ -453,7 +479,7 @@ impl HttpClientError {
 
     pub fn request_send_error(url: reqwest::Url, source: reqwest::Error) -> Self {
         HttpClientError::RequestSendFailure {
-            url,
+            url: Box::new(url),
             source: ReqwestErrorWrapper(source),
         }
     }
@@ -554,6 +580,19 @@ pub trait ApiClientCore {
         let req = self.create_request(method, path, params, json_body)?;
         self.send(req).await
     }
+
+    /// If multiple base urls are available rotate to next (e.g. when the current one resulted in an error)
+    ///
+    /// Takes an optional URL argument. If this is none, the current host will be updated automatically.
+    /// If a url is provided first check that the CURRENT host matches the hostname in the URL before
+    /// triggering a rotation. This is meant to prevent parallel requests that fail from rotating the host
+    /// multiple times.
+    fn maybe_rotate_hosts(&self, offending_url: Option<Url>);
+
+    /// If the fronting policy for the client is set to `OnRetry` this function will enable the
+    /// fronting if not already enabled.
+    #[cfg(feature = "tunneling")]
+    fn maybe_enable_fronting(&self, context: impl std::fmt::Debug);
 }
 
 /// A `ClientBuilder` can be used to create a [`Client`] with custom configuration applied consistently
@@ -562,16 +601,18 @@ pub struct ClientBuilder {
     urls: Vec<Url>,
 
     timeout: Option<Duration>,
-    custom_user_agent: bool,
-    reqwest_client_builder: reqwest::ClientBuilder,
+    custom_user_agent: Option<HeaderValue>,
+    reqwest_client_builder: Option<reqwest::ClientBuilder>,
     #[allow(dead_code)] // not dead code, just unused in wasm
     use_secure_dns: bool,
 
     #[cfg(feature = "tunneling")]
-    front: Option<fronted::Front>,
+    front: fronted::Front,
 
     retry_limit: usize,
     serialization: SerializationFormat,
+
+    error: Option<HttpClientError>,
 }
 
 impl ClientBuilder {
@@ -642,10 +683,10 @@ impl ClientBuilder {
 
         let mut builder = Self::new_with_urls(urls)?;
 
-        // Enable domain fronting by default (on retry)
+        // Enable domain fronting using the shared fronting policy
         #[cfg(feature = "tunneling")]
         {
-            builder = builder.with_fronting(FrontPolicy::OnRetry);
+            builder = builder.with_fronting(None);
         }
 
         Ok(builder)
@@ -659,26 +700,31 @@ impl ClientBuilder {
 
         let urls = Self::check_urls(urls);
 
-        #[cfg(target_arch = "wasm32")]
-        let reqwest_client_builder = reqwest::ClientBuilder::new();
-
-        #[cfg(not(target_arch = "wasm32"))]
-        let reqwest_client_builder = default_builder();
-
         Ok(ClientBuilder {
             urls,
             timeout: None,
-            custom_user_agent: false,
-            reqwest_client_builder,
+            custom_user_agent: None,
+            reqwest_client_builder: None,
             use_secure_dns: true,
             #[cfg(feature = "tunneling")]
-            front: None,
+            front: fronted::Front::off(),
 
             retry_limit: 0,
             serialization: SerializationFormat::Json,
+            error: None,
         })
     }
 
+    /// Configure use of an independent HTTP request executor. This prevents use of beneficial
+    /// features like connection pooling under the hood.
+    #[cfg(not(target_arch = "wasm32"))]
+    pub fn non_shared(mut self) -> Self {
+        if self.reqwest_client_builder.is_none() {
+            self.reqwest_client_builder = Some(default_builder());
+        }
+        self
+    }
+
     /// Add an additional URL to the set usable by this constructed `Client`
     pub fn add_url(mut self, url: Url) -> Self {
         self.urls.push(url);
@@ -723,7 +769,7 @@ impl ClientBuilder {
 
     /// Provide a pre-configured [`reqwest::ClientBuilder`]
     pub fn with_reqwest_builder(mut self, reqwest_builder: reqwest::ClientBuilder) -> Self {
-        self.reqwest_client_builder = reqwest_builder;
+        self.reqwest_client_builder = Some(reqwest_builder);
         self
     }
 
@@ -733,18 +779,12 @@ impl ClientBuilder {
         V: TryInto<HeaderValue>,
         V::Error: Into<http::Error>,
     {
-        self.custom_user_agent = true;
-        self.reqwest_client_builder = self.reqwest_client_builder.user_agent(value);
-        self
-    }
-
-    /// Override DNS resolution for specific domains to particular IP addresses.
-    ///
-    /// Set the port to `0` to use the conventional port for the given scheme (e.g. 80 for http).
-    /// Ports in the URL itself will always be used instead of the port in the overridden addr.
-    #[cfg(not(target_arch = "wasm32"))]
-    pub fn resolve_to_addrs(mut self, domain: &str, addrs: &[SocketAddr]) -> ClientBuilder {
-        self.reqwest_client_builder = self.reqwest_client_builder.resolve_to_addrs(domain, addrs);
+        match value.try_into() {
+            Ok(v) => self.custom_user_agent = Some(v),
+            Err(err) => {
+                self.error = Some(HttpClientError::InvalidHeaderValue { source: err.into() })
+            }
+        }
         self
     }
 
@@ -761,30 +801,33 @@ impl ClientBuilder {
 
     /// Returns a Client that uses this ClientBuilder configuration.
     pub fn build(self) -> Result<Client, HttpClientError> {
+        if let Some(err) = self.error {
+            return Err(err);
+        }
+
         #[cfg(target_arch = "wasm32")]
-        let reqwest_client = self.reqwest_client_builder.build()?;
+        let reqwest_client = Some(reqwest::ClientBuilder::new().build()?);
 
-        // TODO: we should probably be propagating the error rather than panicking,
-        // but that'd break bunch of things due to type changes
         #[cfg(not(target_arch = "wasm32"))]
-        let reqwest_client = {
-            let mut builder = self.reqwest_client_builder;
+        let reqwest_client = self
+            .reqwest_client_builder
+            .map(|mut builder| {
+                // unless explicitly disabled use the DoT/DoH enabled resolver
+                if self.use_secure_dns {
+                    builder = builder.dns_resolver(Arc::new(HickoryDnsResolver::default()));
+                }
 
-            // unless explicitly disabled use the DoT/DoH enabled resolver
-            if self.use_secure_dns {
-                builder = builder.dns_resolver(Arc::new(HickoryDnsResolver::default()));
-            }
-
-            builder
-                .build()
-                .map_err(HttpClientError::reqwest_client_build_error)?
-        };
+                builder
+                    .build()
+                    .map_err(HttpClientError::reqwest_client_build_error)
+            })
+            .transpose()?;
 
         let client = Client {
             base_urls: self.urls,
             current_idx: Arc::new(AtomicUsize::new(0)),
             reqwest_client,
-            using_secure_dns: self.use_secure_dns,
+            custom_user_agent: self.custom_user_agent,
 
             #[cfg(feature = "tunneling")]
             front: self.front,
@@ -804,11 +847,11 @@ impl ClientBuilder {
 pub struct Client {
     base_urls: Vec<Url>,
     current_idx: Arc<AtomicUsize>,
-    reqwest_client: reqwest::Client,
-    using_secure_dns: bool,
+    reqwest_client: Option<reqwest::Client>,
+    custom_user_agent: Option<HeaderValue>,
 
     #[cfg(feature = "tunneling")]
-    front: Option<fronted::Front>,
+    front: fronted::Front,
 
     #[cfg(target_arch = "wasm32")]
     request_timeout: Duration,
@@ -862,8 +905,8 @@ impl Client {
         Client {
             base_urls: vec![new_url],
             current_idx: Arc::new(Default::default()),
-            reqwest_client: self.reqwest_client.clone(),
-            using_secure_dns: self.using_secure_dns,
+            reqwest_client: None,
+            custom_user_agent: None,
 
             #[cfg(feature = "tunneling")]
             front: self.front.clone(),
@@ -897,9 +940,7 @@ impl Client {
 
     #[cfg(feature = "tunneling")]
     fn matches_current_host(&self, url: &Url) -> bool {
-        if let Some(ref front) = self.front
-            && front.is_enabled()
-        {
+        if self.front.is_enabled() {
             url.host_str() == self.current_url().front_str()
         } else {
             url.host_str() == self.current_url().host_str()
@@ -926,9 +967,7 @@ impl Client {
         }
 
         #[cfg(feature = "tunneling")]
-        if let Some(ref front) = self.front
-            && front.is_enabled()
-        {
+        if self.front.is_enabled() {
             // if we are using fronting, try updating to the next front
             let url = self.current_url();
 
@@ -948,9 +987,7 @@ impl Client {
 
             // if fronting is enabled we want to update to a host that has fronts configured
             #[cfg(feature = "tunneling")]
-            if let Some(ref front) = self.front
-                && front.is_enabled()
-            {
+            if self.front.is_enabled() {
                 while next != orig {
                     if self.base_urls[next].has_front() {
                         // we have a front for the next host, so we can use it
@@ -981,14 +1018,12 @@ impl Client {
     /// this method. For example, if the client is configured to rotate hosts after each error, this
     /// method should be called after the host has been updated -- i.e. as part of the subsequent
     /// send.
-    fn apply_hosts_to_req(&self, r: &mut reqwest::Request) -> (&str, Option<&str>) {
+    pub(crate) fn apply_hosts_to_req(&self, r: &mut reqwest::Request) -> (&str, Option<&str>) {
         let url = self.current_url();
         r.url_mut().set_host(url.host_str()).unwrap();
 
         #[cfg(feature = "tunneling")]
-        if let Some(ref front) = self.front
-            && front.is_enabled()
-        {
+        if self.front.is_enabled() {
             if let Some(front_host) = url.front_str() {
                 if let Some(actual_host) = url.host_str() {
                     tracing::debug!(
@@ -1008,6 +1043,13 @@ impl Client {
                         .headers_mut()
                         .insert(reqwest::header::HOST, actual_host_header);
 
+                    // Set a custom header to capture the outer host (used in the SNI) of the request
+                    let front_host_header: HeaderValue =
+                        front_host.parse().unwrap_or(HeaderValue::from_static(""));
+                    _ = r
+                        .headers_mut()
+                        .insert(NYM_OUTER_SNI_HEADER, front_host_header);
+
                     return (url.as_str(), url.front_str());
                 } else {
                     tracing::debug!(
@@ -1048,12 +1090,21 @@ impl ApiClientCore for Client {
 
         self.apply_hosts_to_req(&mut req);
 
-        let mut rb = RequestBuilder::from_parts(self.reqwest_client.clone(), req);
+        let client = if let Some(client) = &self.reqwest_client {
+            client.clone()
+        } else {
+            SHARED_CLIENT.clone()
+        };
+        let mut rb = RequestBuilder::from_parts(client, req);
 
         rb = rb
             .header(ACCEPT, self.serialization.content_type())
             .header(CONTENT_TYPE, self.serialization.content_type());
 
+        if let Some(user_agent) = &self.custom_user_agent {
+            rb = rb.header(USER_AGENT, user_agent.clone());
+        }
+
         if let Some(body) = body {
             match self.serialization {
                 SerializationFormat::Json => {
@@ -1096,16 +1147,19 @@ impl ApiClientCore for Client {
 
             #[cfg(target_arch = "wasm32")]
             let response: Result<Response, HttpClientError> = {
-                Ok(wasmtimer::tokio::timeout(
-                    self.request_timeout,
-                    self.reqwest_client.execute(req),
+                let client = self.reqwest_client.as_ref().unwrap_or(&*SHARED_CLIENT);
+                Ok(
+                    wasmtimer::tokio::timeout(self.request_timeout, client.execute(req))
+                        .await
+                        .map_err(|_timeout| HttpClientError::RequestTimeout)??,
                 )
-                .await
-                .map_err(|_timeout| HttpClientError::RequestTimeout)??)
             };
 
             #[cfg(not(target_arch = "wasm32"))]
-            let response = self.reqwest_client.execute(req).await;
+            let response = {
+                let client = self.reqwest_client.as_ref().unwrap_or(&*SHARED_CLIENT);
+                client.execute(req).await
+            };
 
             match response {
                 Ok(resp) => return Ok(resp),
@@ -1121,20 +1175,10 @@ impl ApiClientCore for Client {
 
                     if is_network_err {
                         // if we have multiple urls, update to the next
-                        self.update_host(Some(url.clone()));
+                        self.maybe_rotate_hosts(Some(url.clone()));
 
                         #[cfg(feature = "tunneling")]
-                        if let Some(ref front) = self.front {
-                            // If fronting is set to be enabled on error, enable domain fronting as we
-                            // have encountered an error.
-                            let was_enabled = front.is_enabled();
-                            front.retry_enable();
-                            if !was_enabled && front.is_enabled() {
-                                tracing::info!(
-                                    "Domain fronting activated after connection failure: {err}",
-                                );
-                            }
-                        }
+                        self.maybe_enable_fronting(("network", url.as_str(), &err));
                     }
 
                     if attempts < self.retry_limit {
@@ -1158,6 +1202,21 @@ impl ApiClientCore for Client {
             }
         }
     }
+
+    fn maybe_rotate_hosts(&self, offending: Option<Url>) {
+        self.update_host(offending);
+    }
+
+    #[cfg(feature = "tunneling")]
+    fn maybe_enable_fronting(&self, context: impl std::fmt::Debug) {
+        // If fronting is set to be OnRetry, enable domain fronting as we
+        // have encountered an error.
+        let was_enabled = self.front.is_enabled();
+        self.front.retry_enable();
+        if !was_enabled && self.front.is_enabled() {
+            tracing::debug!("Domain fronting activated after failure: {context:?}",);
+        }
+    }
 }
 
 /// Common usage functionality for the http client.
@@ -1310,6 +1369,35 @@ pub trait ApiClient: ApiClientCore {
         self.get_response(path, params).await
     }
 
+    /// Attempt to parse a response object from an HTTP response
+    async fn parse_response<T>(
+        &self,
+        res: Response,
+        allow_empty: bool,
+    ) -> Result<T, HttpClientError>
+    where
+        T: DeserializeOwned,
+    {
+        let url = Url::from(res.url());
+        parse_response(res, allow_empty).await.inspect_err(|e| {
+            if matches!(
+                // if we encounter a read error while we attempt to parse it could be caused by censorship and we should
+                // rotate hosts / enable fronting.
+                e,
+                HttpClientError::ResponseReadFailure {
+                    url: _,
+                    headers: _,
+                    status: _,
+                    source: _,
+                }
+            ) {
+                self.maybe_rotate_hosts(Some(url.clone()));
+                #[cfg(feature = "tunneling")]
+                self.maybe_enable_fronting(("parse/read", url.as_str(), e));
+            }
+        })
+    }
+
     /// 'get' data from the segment-defined path, e.g. `["api", "v1", "mixnodes"]`, with tuple
     /// defined key-value parameters, e.g. `[("since", "12345")]`. Attempt to parse the response
     /// into the provided type `T` based on the content type header
@@ -1327,7 +1415,8 @@ pub trait ApiClient: ApiClientCore {
         let res = self
             .send_request(reqwest::Method::GET, path, params, None::<&()>)
             .await?;
-        parse_response(res, false).await
+
+        self.parse_response(res, false).await
     }
 
     /// 'post' json data to the segment-defined path, e.g. `["api", "v1", "mixnodes"]`, with tuple
@@ -1349,7 +1438,7 @@ pub trait ApiClient: ApiClientCore {
         let res = self
             .send_request(reqwest::Method::POST, path, params, Some(json_body))
             .await?;
-        parse_response(res, false).await
+        self.parse_response(res, false).await
     }
 
     /// 'delete' json data from the segment-defined path, e.g. `["api", "v1", "mixnodes"]`, with
@@ -1369,7 +1458,7 @@ pub trait ApiClient: ApiClientCore {
         let res = self
             .send_request(reqwest::Method::DELETE, path, params, None::<&()>)
             .await?;
-        parse_response(res, false).await
+        self.parse_response(res, false).await
     }
 
     /// 'patch' json data at the segment-defined path, e.g. `["api", "v1", "mixnodes"]`, with tuple
@@ -1391,7 +1480,7 @@ pub trait ApiClient: ApiClientCore {
         let res = self
             .send_request(reqwest::Method::PATCH, path, params, Some(json_body))
             .await?;
-        parse_response(res, false).await
+        self.parse_response(res, false).await
     }
 
     /// `get` json data from the provided absolute endpoint, e.g. `"/api/v1/mixnodes?since=12345"`.
@@ -1403,7 +1492,7 @@ pub trait ApiClient: ApiClientCore {
     {
         let req = self.create_request_endpoint(reqwest::Method::GET, endpoint, None::<&()>)?;
         let res = self.send(req).await?;
-        parse_response(res, false).await
+        self.parse_response(res, false).await
     }
 
     /// `post` json data to the provided absolute endpoint, e.g. `"/api/v1/mixnodes?since=12345"`.
@@ -1420,7 +1509,7 @@ pub trait ApiClient: ApiClientCore {
     {
         let req = self.create_request_endpoint(reqwest::Method::POST, endpoint, Some(json_body))?;
         let res = self.send(req).await?;
-        parse_response(res, false).await
+        self.parse_response(res, false).await
     }
 
     /// `delete` json data from the provided absolute endpoint, e.g.
@@ -1432,7 +1521,7 @@ pub trait ApiClient: ApiClientCore {
     {
         let req = self.create_request_endpoint(reqwest::Method::DELETE, endpoint, None::<&()>)?;
         let res = self.send(req).await?;
-        parse_response(res, false).await
+        self.parse_response(res, false).await
     }
 
     /// `patch` json data at the provided absolute endpoint, e.g. `"/api/v1/mixnodes?since=12345"`.
@@ -1450,7 +1539,7 @@ pub trait ApiClient: ApiClientCore {
         let req =
             self.create_request_endpoint(reqwest::Method::PATCH, endpoint, Some(json_body))?;
         let res = self.send(req).await?;
-        parse_response(res, false).await
+        self.parse_response(res, false).await
     }
 }
 
@@ -1517,7 +1606,7 @@ where
 
     if !allow_empty && let Some(0) = res.content_length() {
         return Err(HttpClientError::EmptyResponse {
-            url,
+            url: Box::new(url),
             status,
             headers: Box::new(headers),
         });
@@ -1530,25 +1619,25 @@ where
             .bytes()
             .await
             .map_err(|source| HttpClientError::ResponseReadFailure {
-                url,
+                url: Box::new(url),
                 headers: Box::new(headers.clone()),
                 status,
                 source: ReqwestErrorWrapper(source),
             })?;
         decode_raw_response(&headers, full)
     } else if res.status() == StatusCode::NOT_FOUND {
-        Err(HttpClientError::NotFound { url })
+        Err(HttpClientError::NotFound { url: Box::new(url) })
     } else {
         let Ok(plaintext) = res.text().await else {
             return Err(HttpClientError::RequestFailure {
-                url,
+                url: Box::new(url),
                 status,
                 headers: Box::new(headers),
             });
         };
 
         Err(HttpClientError::EndpointFailure {
-            url,
+            url: Box::new(url),
             status,
             headers: Box::new(headers),
             error: plaintext,

common/http-api-client/src/tests.rs

@@ -89,7 +89,8 @@ fn sanitizing_urls() {
 // - on error without retries is where we have multiple urls, is the url updated?
 
 #[tokio::test]
-#[ignore] // test relies on external services being available and behaving in a specific way.
+#[cfg(any())] // #[ignore] we run ignore assuming it just means slow in Ci/CD -_-
+// test relies on external services being available and behaving in a specific way.
 async fn api_client_retry() -> Result<(), Box<dyn std::error::Error>> {
     let client = ClientBuilder::new_with_urls(vec![
         "http://broken.nym.test".parse()?, // This should fail because of DNS NXDomain (rotate)
@@ -199,7 +200,7 @@ fn fronted_host_updating() {
     let url = Url::new("http://nym-api.test", Some(vec!["http://cdn1.test"])).unwrap();
     let mut client = ClientBuilder::new(url)
         .unwrap()
-        .with_fronting(crate::fronted::FrontPolicy::Always)
+        .with_fronting(Some(crate::fronted::FrontPolicy::Always))
         .build()
         .unwrap();
 

common/http-api-client/src/url.rs

@@ -123,6 +123,16 @@ impl From<reqwest::Url> for Url {
     }
 }
 
+impl From<&reqwest::Url> for Url {
+    fn from(url: &url::Url) -> Self {
+        Self {
+            url: url.clone(),
+            fronts: None,
+            current_front: Arc::new(AtomicUsize::new(0)),
+        }
+    }
+}
+
 impl AsRef<url::Url> for Url {
     fn as_ref(&self) -> &url::Url {
         &self.url

common/http-api-common/src/lib.rs

@@ -11,8 +11,10 @@ pub mod response;
 #[cfg(feature = "output")]
 pub use response::*;
 
+pub use ::bincode::Options as BincodeOptions;
+
 // be explicit about those values because bincode uses different defaults in different places
-pub fn make_bincode_serializer() -> impl ::bincode::Options {
+pub fn make_bincode_serializer() -> impl BincodeOptions {
     use ::bincode::Options;
     ::bincode::DefaultOptions::new()
         .with_little_endian()

common/network-defaults/Cargo.toml

@@ -6,12 +6,17 @@ edition.workspace = true
 authors.workspace = true
 license.workspace = true
 repository.workspace = true
+# Exclude build.rs from published crate - it's only used for dev-time sync
+# of env files and requires workspace context
+exclude = ["build.rs"]
 
 [dependencies]
 dotenvy = { workspace = true, optional = true }
 log = { workspace = true, optional = true }
 schemars = { workspace = true, features = ["preserve_order"], optional = true }
 serde = { workspace = true, features = ["derive"], optional = true }
+serde_json = {workspace = true, optional = true }
+tracing = {workspace = true, optional = true }
 url = { workspace = true, optional = true }
 utoipa = { workspace = true, optional = true }
 
@@ -20,7 +25,7 @@ utoipa = { workspace = true, optional = true }
 
 [features]
 default = ["env", "network"]
-env = ["dotenvy", "log"]
+env = ["dotenvy", "log", "serde_json", "tracing"]
 network = ["schemars", "serde", "url"]
 utoipa = [ "dep:utoipa" ]
 

common/network-defaults/src/mainnet.rs

@@ -51,6 +51,10 @@ pub const NYM_APIS: &[ApiUrlConst] = &[
         url: "https://nym-frontdoor.global.ssl.fastly.net/api/",
         front_hosts: Some(&["yelp.global.ssl.fastly.net"]),
     },
+    ApiUrlConst {
+        url: "https://cdn1.media-platform.net/api/",
+        front_hosts: None,
+    },
 ];
 
 pub const NYM_VPN_API: &str = "https://nymvpn.com/api/";
@@ -72,6 +76,13 @@ pub const NYM_VPN_APIS: &[ApiUrlConst] = &[
     },
 ];
 
+#[cfg(feature = "env")]
+fn serialize_api_urls(urls: &[ApiUrlConst]) -> String {
+    serde_json::to_string(urls)
+        .inspect_err(|e| tracing::warn!("failed to serialize nym_api_urls for env: {e}"))
+        .unwrap_or_default()
+}
+
 // I'm making clippy mad on purpose, because that url HAS TO be updated and deployed before merging
 pub const EXIT_POLICY_URL: &str =
     "https://nymtech.net/.wellknown/network-requester/exit-policy.txt";
@@ -162,9 +173,11 @@ pub fn export_to_env() {
     );
     set_var_to_default(var_names::NYXD, NYXD_URL);
     set_var_to_default(var_names::NYM_API, NYM_API);
+    set_var_to_default(var_names::NYM_APIS, &serialize_api_urls(NYM_APIS));
     set_var_to_default(var_names::NYXD_WEBSOCKET, NYXD_WS);
     set_var_to_default(var_names::EXIT_POLICY_URL, EXIT_POLICY_URL);
     set_var_to_default(var_names::NYM_VPN_API, NYM_VPN_API);
+    set_var_to_default(var_names::NYM_VPN_APIS, &serialize_api_urls(NYM_VPN_APIS));
     set_var_to_default(
         var_names::UPGRADE_MODE_ATTESTATION_URL,
         UPGRADE_MODE_ATTESTATION_URL,
@@ -211,6 +224,9 @@ pub fn export_to_env_if_not_set() {
     );
     set_var_conditionally_to_default(var_names::NYXD, NYXD_URL);
     set_var_conditionally_to_default(var_names::NYM_API, NYM_API);
+    set_var_conditionally_to_default(var_names::NYM_APIS, &serialize_api_urls(NYM_APIS));
+    set_var_conditionally_to_default(var_names::NYM_VPN_API, NYM_VPN_API);
+    set_var_conditionally_to_default(var_names::NYM_VPN_APIS, &serialize_api_urls(NYM_VPN_APIS));
     set_var_conditionally_to_default(var_names::NYXD_WEBSOCKET, NYXD_WS);
     set_var_conditionally_to_default(var_names::EXIT_POLICY_URL, EXIT_POLICY_URL);
     set_var_conditionally_to_default(

common/network-defaults/src/network.rs

@@ -7,6 +7,13 @@ use serde::{Deserialize, Serialize};
 use std::ops::Not;
 use url::Url;
 
+#[cfg(feature = "env")]
+use crate::var_names;
+#[cfg(feature = "env")]
+use std::env::{VarError, var};
+#[cfg(feature = "env")]
+use std::ffi::OsStr;
+
 #[derive(Clone, Debug, Deserialize, Eq, Hash, PartialEq, Serialize, JsonSchema)]
 #[cfg_attr(feature = "utoipa", derive(utoipa::ToSchema))]
 pub struct ChainDetails {
@@ -55,7 +62,7 @@ pub struct ApiUrl {
     pub front_hosts: Option<Vec<String>>,
 }
 
-#[derive(Copy, Clone)]
+#[derive(Copy, Clone, Debug, Serialize)]
 pub struct ApiUrlConst<'a> {
     pub url: &'a str,
     pub front_hosts: Option<&'a [&'a str]>,
@@ -106,10 +113,6 @@ impl NymNetworkDetails {
 
     #[cfg(feature = "env")]
     pub fn new_from_env() -> Self {
-        use crate::var_names;
-        use std::env::{VarError, var};
-        use std::ffi::OsStr;
-
         fn get_optional_env<K: AsRef<OsStr>>(env: K) -> Option<String> {
             match var(env) {
                 Ok(var) => {
@@ -125,6 +128,11 @@ impl NymNetworkDetails {
         }
 
         let nym_api = var(var_names::NYM_API).expect("nym api not set");
+        let nym_api_urls = try_parse_api_urls(var_names::NYM_APIS).unwrap_or(vec![ApiUrl {
+            url: nym_api.clone(),
+            front_hosts: None,
+        }]);
+        let nym_vpn_api_urls = try_parse_api_urls(var_names::NYM_VPN_APIS);
 
         NymNetworkDetails::new_empty()
             .with_network_name(var(var_names::NETWORK_NAME).expect("network name not set"))
@@ -161,10 +169,8 @@ impl NymNetworkDetails {
             .with_multisig_contract(get_optional_env(var_names::MULTISIG_CONTRACT_ADDRESS))
             .with_coconut_dkg_contract(get_optional_env(var_names::COCONUT_DKG_CONTRACT_ADDRESS))
             .with_nym_vpn_api_url(get_optional_env(var_names::NYM_VPN_API))
-            .with_nym_api_urls(Some(vec![ApiUrl {
-                url: nym_api,
-                front_hosts: None,
-            }]))
+            .with_nym_vpn_api_urls(nym_vpn_api_urls)
+            .with_nym_api_urls(nym_api_urls)
     }
 
     pub fn new_mainnet() -> Self {
@@ -218,6 +224,9 @@ impl NymNetworkDetails {
             }
         }
         unsafe {
+            let nym_api_urls = self.nym_api_urls();
+            let nym_vpn_api_urls = self.nym_vpn_api_urls();
+
             set_var(var_names::NETWORK_NAME, self.network_name);
             set_var(var_names::BECH32_PREFIX, self.chain_details.bech32_account_prefix);
 
@@ -243,9 +252,10 @@ impl NymNetworkDetails {
             set_optional_var(var_names::COCONUT_DKG_CONTRACT_ADDRESS, self.contracts.coconut_dkg_contract_address);
 
             set_optional_var(var_names::NYM_VPN_API, self.nym_vpn_api_url);
+            set_optional_var(var_names::NYM_VPN_APIS, nym_vpn_api_urls);
+            set_optional_var(var_names::NYM_APIS, nym_api_urls);
+
         }
-
-
     }
 
     pub fn default_gas_price_amount(&self) -> f64 {
@@ -355,8 +365,14 @@ impl NymNetworkDetails {
     }
 
     #[must_use]
-    pub fn with_nym_api_urls(mut self, urls: Option<Vec<ApiUrl>>) -> Self {
-        self.nym_api_urls = urls;
+    pub fn with_nym_api_urls(mut self, urls: Vec<ApiUrl>) -> Self {
+        self.nym_api_urls = Some(urls);
+        self
+    }
+
+    #[must_use]
+    pub fn with_nym_vpn_api_urls(mut self, urls: Option<Vec<ApiUrl>>) -> Self {
+        self.nym_vpn_api_urls = urls;
         self
     }
 
@@ -366,6 +382,28 @@ impl NymNetworkDetails {
                 .expect("the provided nym-vpn api url is invalid!")
         })
     }
+
+    #[cfg(feature = "env")]
+    fn nym_api_urls(&self) -> Option<String> {
+        serde_json::to_string(self.nym_api_urls.as_deref()?)
+            .inspect_err(|e| tracing::warn!("failed to serialize nym_api_urls for env: {e}"))
+            .ok()
+    }
+
+    #[cfg(feature = "env")]
+    fn nym_vpn_api_urls(&self) -> Option<String> {
+        serde_json::to_string(self.nym_vpn_api_urls.as_deref()?)
+            .inspect_err(|e| tracing::warn!("failed to serialize nym_vpn_api_urls for env: {e}"))
+            .ok()
+    }
+}
+
+#[cfg(feature = "env")]
+fn try_parse_api_urls(k: impl AsRef<OsStr>) -> Option<Vec<ApiUrl>> {
+    let raw = var(k).ok()?;
+    serde_json::from_str(&raw)
+        .inspect_err(|e| tracing::warn!("failed to parse api urls from env \"{raw:?}\": {e}"))
+        .ok()
 }
 
 #[derive(Debug, Copy, Serialize, Deserialize, Clone, PartialEq, Eq)]

common/network-defaults/src/var_names.rs

@@ -21,9 +21,11 @@ pub const COCONUT_DKG_CONTRACT_ADDRESS: &str = "COCONUT_DKG_CONTRACT_ADDRESS";
 pub const REWARDING_VALIDATOR_ADDRESS: &str = "REWARDING_VALIDATOR_ADDRESS";
 pub const NYXD: &str = "NYXD";
 pub const NYM_API: &str = "NYM_API";
+pub const NYM_APIS: &str = "NYM_APIS";
 pub const NYXD_WEBSOCKET: &str = "NYXD_WS";
 pub const EXIT_POLICY_URL: &str = "EXIT_POLICY";
 pub const NYM_VPN_API: &str = "NYM_VPN_API";
+pub const NYM_VPN_APIS: &str = "NYM_VPN_APIS";
 pub const CLIENT_STATS_COLLECTION_PROVIDER: &str = "CLIENT_STATS_COLLECTION_PROVIDER";
 pub const UPGRADE_MODE_ATTESTATION_URL: &str = "UPGRADE_MODE_ATTESTATION_URL";
 pub const UPGRADE_MODE_ATTESTER_ED25519_BS58_PUBKEY: &str = "UPGRADE_MODE_ATTESTER_ED25519_PUBKEY";

common/nym-kcp/Cargo.toml

@@ -6,6 +6,7 @@ edition = { workspace = true }
 authors = { workspace = true }
 license = { workspace = true }
 repository = { workspace = true }
+publish = false
 
 [lib]
 name = "nym_kcp"

common/nym-kkt-ciphersuite/Cargo.toml

@@ -0,0 +1,26 @@
+[package]
+name = "nym-kkt-ciphersuite"
+authors.workspace = true
+repository.workspace = true
+homepage.workspace = true
+documentation.workspace = true
+edition.workspace = true
+license.workspace = true
+rust-version.workspace = true
+readme.workspace = true
+version.workspace = true
+
+[dependencies]
+thiserror = { workspace = true }
+num_enum = { workspace = true }
+strum = { workspace = true }
+strum_macros = { workspace = true }
+
+blake3 = { workspace = true, optional = true }
+libcrux-sha3 = { git = "https://github.com/cryspen/libcrux", optional = true }
+
+[features]
+digests = ["blake3", "libcrux-sha3"]
+
+[lints]
+workspace = true

common/nym-kkt-ciphersuite/src/error.rs

@@ -0,0 +1,21 @@
+// Copyright 2026 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use thiserror::Error;
+
+#[derive(Debug, Error)]
+pub enum KKTCiphersuiteError {
+    #[error(
+        "attempted to use an insecure encapsulation key hash length. requested: {requested}. minimum: {minimum}"
+    )]
+    InsecureHashLen { requested: u8, minimum: u8 },
+
+    #[error("{raw} does not correspond to any known KEM type encoding")]
+    UnknownKEMType { raw: u8 },
+
+    #[error("{raw} does not correspond to any known Hash Function type encoding")]
+    UnknownHashFunctionType { raw: u8 },
+
+    #[error("{raw} does not correspond to any known Signature Scheme type encoding")]
+    UnknownSignatureSchemeType { raw: u8 },
+}

common/nym-kkt-ciphersuite/src/lib.rs

@@ -0,0 +1,383 @@
+// Copyright 2026 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use crate::error::KKTCiphersuiteError;
+use num_enum::{IntoPrimitive, TryFromPrimitive};
+use std::collections::HashMap;
+use std::fmt::Display;
+use strum_macros::{Display, EnumIter, EnumString};
+
+pub mod error;
+
+pub const DEFAULT_HASH_LEN: usize = 32;
+const _: () = assert!(DEFAULT_HASH_LEN <= u8::MAX as usize);
+
+pub const MINIMUM_SECURE_HASH_LEN: u8 = 16;
+const _: () = assert!(MINIMUM_SECURE_HASH_LEN <= DEFAULT_HASH_LEN as u8);
+
+pub const CIPHERSUITE_ENCODING_LEN: usize = 4;
+
+// no point in importing curve libraries for well-defined constants
+pub mod ed25519 {
+    pub const SECRET_KEY_LENGTH: usize = 32;
+    pub const PUBLIC_KEY_LENGTH: usize = 32;
+    pub const SIGNATURE_LENGTH: usize = 64;
+}
+
+pub mod x25519 {
+    pub const PUBLIC_KEY_LENGTH: usize = 32;
+    pub const SECRET_KEY_LENGTH: usize = 32;
+}
+
+pub mod ml_kem768 {
+    pub const PUBLIC_KEY_LENGTH: usize = 1184;
+}
+
+pub mod mceliece {
+    pub const PUBLIC_KEY_LENGTH: usize = 524160;
+    pub const SECRET_KEY_LENGTH: usize = 13608;
+    pub const CIPHERTEXT_LENGTH: usize = 156;
+}
+
+pub mod xwing {
+    use crate::{ml_kem768, x25519};
+
+    pub const PUBLIC_KEY_LENGTH: usize = x25519::PUBLIC_KEY_LENGTH + ml_kem768::PUBLIC_KEY_LENGTH;
+}
+
+pub type KEMKeyDigests = KeyDigests;
+pub type SigningKeyDigests = KeyDigests;
+
+pub type KeyDigests = HashMap<HashFunction, Vec<u8>>;
+
+#[derive(
+    Clone,
+    Copy,
+    PartialEq,
+    Eq,
+    Hash,
+    Debug,
+    IntoPrimitive,
+    TryFromPrimitive,
+    EnumIter,
+    EnumString,
+    Display,
+)]
+#[strum(ascii_case_insensitive)]
+#[strum(serialize_all = "lowercase")]
+#[repr(u8)]
+pub enum HashFunction {
+    Blake3 = 0,
+    Shake256 = 1,
+    Shake128 = 2,
+    SHA256 = 3,
+}
+
+impl HashFunction {
+    #[cfg(feature = "digests")]
+    pub fn digest<M: AsRef<[u8]>>(&self, data: M, output_length: usize) -> Vec<u8> {
+        let mut out = vec![0u8; output_length];
+        match self {
+            HashFunction::Blake3 => {
+                let mut hasher = blake3::Hasher::new();
+                hasher.update(data.as_ref());
+                hasher.finalize_xof().fill(&mut out);
+                hasher.reset();
+            }
+            HashFunction::Shake256 => libcrux_sha3::shake256_ema(&mut out, data.as_ref()),
+            HashFunction::Shake128 => libcrux_sha3::shake128_ema(&mut out, data.as_ref()),
+            HashFunction::SHA256 => libcrux_sha3::sha256_ema(&mut out, data.as_ref()),
+        }
+
+        out
+    }
+}
+
+#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug, IntoPrimitive)]
+#[repr(u8)]
+pub enum HashLength {
+    Default = 0,
+    #[num_enum(catch_all)]
+    Custom(u8),
+}
+
+impl Display for HashLength {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            HashLength::Default => DEFAULT_HASH_LEN.fmt(f),
+            HashLength::Custom(custom_len) => custom_len.fmt(f),
+        }
+    }
+}
+
+impl HashLength {
+    pub fn decode(raw: u8) -> Result<Self, KKTCiphersuiteError> {
+        // check if we're using encoding for 'default' value
+        if raw == u8::from(Self::Default) {
+            return Ok(Self::Default);
+        }
+        // otherwise, we treat it as a custom length, and we have to validate its security
+        let custom_len = raw;
+
+        if custom_len < MINIMUM_SECURE_HASH_LEN {
+            return Err(KKTCiphersuiteError::InsecureHashLen {
+                requested: custom_len,
+                minimum: MINIMUM_SECURE_HASH_LEN,
+            });
+        }
+        Ok(Self::Custom(custom_len))
+    }
+}
+
+impl TryFrom<Option<u8>> for HashLength {
+    type Error = KKTCiphersuiteError;
+
+    fn try_from(value: Option<u8>) -> Result<Self, Self::Error> {
+        match value {
+            None => Ok(Self::Default),
+            Some(custom_len) => Self::decode(custom_len),
+        }
+    }
+}
+
+impl HashLength {
+    pub const fn value(&self) -> usize {
+        match self {
+            HashLength::Default => DEFAULT_HASH_LEN,
+            HashLength::Custom(custom_len) => *custom_len as usize,
+        }
+    }
+}
+
+#[derive(
+    Clone,
+    Copy,
+    PartialEq,
+    Eq,
+    Hash,
+    Debug,
+    IntoPrimitive,
+    TryFromPrimitive,
+    EnumIter,
+    EnumString,
+    Display,
+)]
+#[strum(ascii_case_insensitive)]
+#[strum(serialize_all = "lowercase")]
+#[repr(u8)]
+pub enum SignatureScheme {
+    Ed25519 = 0,
+}
+
+impl SignatureScheme {
+    pub const fn signing_key_length(&self) -> usize {
+        match self {
+            // 32 bytes
+            SignatureScheme::Ed25519 => ed25519::SECRET_KEY_LENGTH,
+        }
+    }
+
+    pub const fn verification_key_length(&self) -> usize {
+        match self {
+            // 32 bytes
+            SignatureScheme::Ed25519 => ed25519::PUBLIC_KEY_LENGTH,
+        }
+    }
+
+    pub const fn signature_length(&self) -> usize {
+        match self {
+            // 64 bytes
+            SignatureScheme::Ed25519 => ed25519::SIGNATURE_LENGTH,
+        }
+    }
+}
+
+#[derive(
+    Clone,
+    Copy,
+    PartialEq,
+    Eq,
+    Hash,
+    Debug,
+    IntoPrimitive,
+    TryFromPrimitive,
+    EnumIter,
+    EnumString,
+    Display,
+)]
+#[strum(ascii_case_insensitive)]
+#[strum(serialize_all = "lowercase")]
+#[repr(u8)]
+pub enum KEM {
+    XWing = 0,
+    MlKem768 = 1,
+    McEliece = 2,
+    X25519 = 255,
+}
+
+impl KEM {
+    pub fn encapsulation_key_length(&self) -> usize {
+        match self {
+            KEM::MlKem768 => ml_kem768::PUBLIC_KEY_LENGTH,
+            KEM::XWing => xwing::PUBLIC_KEY_LENGTH,
+            KEM::X25519 => x25519::PUBLIC_KEY_LENGTH,
+            KEM::McEliece => mceliece::PUBLIC_KEY_LENGTH,
+        }
+    }
+}
+
+#[derive(Clone, Copy, PartialEq, Debug)]
+pub struct Ciphersuite {
+    hash_function: HashFunction,
+    signature_scheme: SignatureScheme,
+    kem: KEM,
+    hash_length: HashLength,
+    encapsulation_key_length: usize,
+    signing_key_length: usize,
+    verification_key_length: usize,
+    signature_length: usize,
+}
+
+impl Ciphersuite {
+    pub fn new(
+        kem: KEM,
+        hash_function: HashFunction,
+        signature_scheme: SignatureScheme,
+        hash_length: HashLength,
+    ) -> Self {
+        Self {
+            hash_function,
+            signature_scheme,
+            kem,
+            hash_length,
+            encapsulation_key_length: kem.encapsulation_key_length(),
+            signing_key_length: signature_scheme.signing_key_length(),
+            verification_key_length: signature_scheme.verification_key_length(),
+            signature_length: signature_scheme.signature_length(),
+        }
+    }
+
+    pub fn kem_key_len(&self) -> usize {
+        self.encapsulation_key_length
+    }
+
+    pub fn signature_len(&self) -> usize {
+        self.signature_length
+    }
+
+    pub fn signing_key_len(&self) -> usize {
+        self.signing_key_length
+    }
+
+    pub fn verification_key_len(&self) -> usize {
+        self.verification_key_length
+    }
+
+    pub fn hash_function(&self) -> HashFunction {
+        self.hash_function
+    }
+
+    pub fn kem(&self) -> KEM {
+        self.kem
+    }
+
+    pub fn signature_scheme(&self) -> SignatureScheme {
+        self.signature_scheme
+    }
+
+    pub fn hash_len(&self) -> usize {
+        self.hash_length.value()
+    }
+
+    pub fn resolve_ciphersuite(
+        kem: KEM,
+        hash_function: HashFunction,
+        signature_scheme: SignatureScheme,
+        // This should be None 99.9999% of the time
+        custom_hash_length: Option<u8>,
+    ) -> Result<Self, KKTCiphersuiteError> {
+        let hash_length = HashLength::try_from(custom_hash_length)?;
+
+        Ok(Ciphersuite::new(
+            kem,
+            hash_function,
+            signature_scheme,
+            hash_length,
+        ))
+    }
+    pub fn encode(&self) -> [u8; CIPHERSUITE_ENCODING_LEN] {
+        // [kem, hash, hashlen, sig]
+        [
+            self.kem.into(),
+            self.hash_function.into(),
+            self.hash_length.into(),
+            self.signature_scheme.into(),
+        ]
+    }
+
+    pub fn decode(encoding: [u8; CIPHERSUITE_ENCODING_LEN]) -> Result<Self, KKTCiphersuiteError> {
+        let raw_kem = encoding[0];
+        let raw_hash_function = encoding[1];
+        let hash_len = encoding[2];
+        let raw_signature_scheme = encoding[3];
+
+        let kem = KEM::try_from(raw_kem)
+            .map_err(|_| KKTCiphersuiteError::UnknownKEMType { raw: raw_kem })?;
+        let hash_function = HashFunction::try_from(raw_hash_function).map_err(|_| {
+            KKTCiphersuiteError::UnknownHashFunctionType {
+                raw: raw_hash_function,
+            }
+        })?;
+        let hash_length = HashLength::decode(hash_len)?;
+        let signature_scheme = SignatureScheme::try_from(raw_signature_scheme).map_err(|_| {
+            KKTCiphersuiteError::UnknownSignatureSchemeType {
+                raw: raw_signature_scheme,
+            }
+        })?;
+
+        Ok(Self::new(kem, hash_function, signature_scheme, hash_length))
+    }
+}
+
+impl Display for Ciphersuite {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.write_str(
+            &format!(
+                "{}_{}({})_{}",
+                self.kem, self.hash_function, self.hash_length, self.signature_scheme
+            )
+            .to_ascii_lowercase(),
+        )
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::str::FromStr;
+    use strum::IntoEnumIterator;
+
+    #[test]
+    fn kem_display_consistency() {
+        for kem in KEM::iter() {
+            let display = format!("{kem}");
+            assert_eq!(kem, KEM::from_str(&display).unwrap());
+        }
+    }
+
+    #[test]
+    fn hash_function_display_consistency() {
+        for hash_fn in HashFunction::iter() {
+            let display = format!("{hash_fn}");
+            assert_eq!(hash_fn, HashFunction::from_str(&display).unwrap());
+        }
+    }
+
+    #[test]
+    fn signature_scheme_display_consistency() {
+        for scheme in SignatureScheme::iter() {
+            let display = format!("{scheme}");
+            assert_eq!(scheme, SignatureScheme::from_str(&display).unwrap());
+        }
+    }
+}

common/nym-kkt/Cargo.toml

@@ -10,18 +10,19 @@ publish = false
 blake3 = { workspace = true }
 thiserror = { workspace = true }
 num_enum = { workspace = true }
+strum = { workspace = true }
 
 
 # internal
 nym-crypto = { path = "../crypto", features = ["asymmetric", "serde"] }
+nym-kkt-ciphersuite = { workspace = true, features = ["digests"] }
 
 libcrux-kem = { git = "https://github.com/cryspen/libcrux" }
-libcrux-sha3 = { git = "https://github.com/cryspen/libcrux" }
 libcrux-ecdh = { git = "https://github.com/cryspen/libcrux", features = ["codec"] }
 libcrux-chacha20poly1305 = { git = "https://github.com/cryspen/libcrux" }
 
-#rand = "0.9.2"
-rand = "0.9.2"
+# rand 0.9 for libcrux integration (libcrux uses rand 0.9)
+rand09 = { workspace = true }
 zeroize = { workspace = true, features = ["zeroize_derive"] }
 classic-mceliece-rust = { git = "https://github.com/georgio/classic-mceliece-rust", features = ["mceliece460896f", "zeroize"] }
 

common/nym-kkt/benches/benches.rs

@@ -18,13 +18,13 @@ use nym_kkt::{
         responder_ingest_message, responder_process,
     },
 };
-use rand::prelude::*;
+use rand09::prelude::*;
 
 pub fn gen_ed25519_keypair(c: &mut Criterion) {
     c.bench_function("Generate Ed25519 Keypair", |b| {
         b.iter(|| {
             let mut s: [u8; 32] = [0u8; 32];
-            rand::rng().fill_bytes(&mut s);
+            rand09::rng().fill_bytes(&mut s);
             ed25519::KeyPair::from_secret(s, 0)
         });
     });
@@ -33,13 +33,13 @@ pub fn gen_ed25519_keypair(c: &mut Criterion) {
 pub fn gen_mlkem768_keypair(c: &mut Criterion) {
     c.bench_function("Generate MlKem768 Keypair", |b| {
         b.iter(|| {
-            libcrux_kem::key_gen(libcrux_kem::Algorithm::MlKem768, &mut rand::rng()).unwrap()
+            libcrux_kem::key_gen(libcrux_kem::Algorithm::MlKem768, &mut rand09::rng()).unwrap()
         });
     });
 }
 
 pub fn kkt_benchmark(c: &mut Criterion) {
-    let mut rng = rand::rng();
+    let mut rng = rand09::rng();
 
     // generate ed25519 keys
     let mut secret_initiator: [u8; 32] = [0u8; 32];
@@ -54,8 +54,8 @@ pub fn kkt_benchmark(c: &mut Criterion) {
         for hash_function in [
             HashFunction::Blake3,
             HashFunction::SHA256,
-            HashFunction::SHAKE128,
-            HashFunction::SHAKE256,
+            HashFunction::Shake128,
+            HashFunction::Shake256,
         ] {
             let ciphersuite = Ciphersuite::resolve_ciphersuite(
                 kem,
@@ -111,7 +111,7 @@ pub fn kkt_benchmark(c: &mut Criterion) {
                     },
                 );
 
-                let (mut i_context, i_frame) =
+                let (i_context, i_frame) =
                     anonymous_initiator_process(&mut rng, ciphersuite).unwrap();
 
                 c.bench_function(
@@ -143,7 +143,7 @@ pub fn kkt_benchmark(c: &mut Criterion) {
                     },
                 );
 
-                let (mut r_context, _) =
+                let (r_context, _) =
                     responder_ingest_message(&r_context, None, None, &i_frame_r).unwrap();
 
                 c.bench_function(
@@ -153,7 +153,7 @@ pub fn kkt_benchmark(c: &mut Criterion) {
                     |b| {
                         b.iter(|| {
                             responder_process(
-                                &mut r_context,
+                                &r_context,
                                 i_frame_r.session_id(),
                                 responder_ed25519_keypair.private_key(),
                                 &responder_kem_public_key,
@@ -163,7 +163,7 @@ pub fn kkt_benchmark(c: &mut Criterion) {
                     },
                 );
                 let r_frame = responder_process(
-                    &mut r_context,
+                    &r_context,
                     i_frame_r.session_id(),
                     responder_ed25519_keypair.private_key(),
                     &responder_kem_public_key,
@@ -184,7 +184,7 @@ pub fn kkt_benchmark(c: &mut Criterion) {
                     |b| {
                         b.iter(|| {
                             initiator_ingest_response(
-                                &mut i_context,
+                                &i_context,
                                 &r_frame,
                                 &r_frame.context().unwrap(),
                                 responder_ed25519_keypair.public_key(),
@@ -196,7 +196,7 @@ pub fn kkt_benchmark(c: &mut Criterion) {
                 );
 
                 let obtained_key = initiator_ingest_response(
-                    &mut i_context,
+                    &i_context,
                     &r_frame,
                     &r_frame.context().unwrap(),
                     responder_ed25519_keypair.public_key(),
@@ -208,7 +208,7 @@ pub fn kkt_benchmark(c: &mut Criterion) {
             }
             // Initiator, OneWay
             {
-                let (mut i_context, i_frame) = initiator_process(
+                let (i_context, i_frame) = initiator_process(
                     &mut rng,
                     KKTMode::OneWay,
                     ciphersuite,
@@ -262,7 +262,7 @@ pub fn kkt_benchmark(c: &mut Criterion) {
                     },
                 );
 
-                let (mut r_context, r_obtained_key) = responder_ingest_message(
+                let (r_context, r_obtained_key) = responder_ingest_message(
                     &r_context,
                     Some(initiator_ed25519_keypair.public_key()),
                     None,
@@ -279,7 +279,7 @@ pub fn kkt_benchmark(c: &mut Criterion) {
                     |b| {
                         b.iter(|| {
                             responder_process(
-                                &mut r_context,
+                                &r_context,
                                 i_frame_r.session_id(),
                                 responder_ed25519_keypair.private_key(),
                                 &responder_kem_public_key,
@@ -290,7 +290,7 @@ pub fn kkt_benchmark(c: &mut Criterion) {
                 );
 
                 let r_frame = responder_process(
-                    &mut r_context,
+                    &r_context,
                     i_frame_r.session_id(),
                     responder_ed25519_keypair.private_key(),
                     &responder_kem_public_key,
@@ -311,7 +311,7 @@ pub fn kkt_benchmark(c: &mut Criterion) {
                     |b| {
                         b.iter(|| {
                             initiator_ingest_response(
-                                &mut i_context,
+                                &i_context,
                                 &r_frame,
                                 &r_frame.context().unwrap(),
                                 responder_ed25519_keypair.public_key(),
@@ -323,7 +323,7 @@ pub fn kkt_benchmark(c: &mut Criterion) {
                 );
 
                 let i_obtained_key = initiator_ingest_response(
-                    &mut i_context,
+                    &i_context,
                     &r_frame,
                     &r_frame.context().unwrap(),
                     responder_ed25519_keypair.public_key(),
@@ -352,7 +352,7 @@ pub fn kkt_benchmark(c: &mut Criterion) {
                     },
                 );
 
-                let (mut i_context, i_frame) = initiator_process(
+                let (i_context, i_frame) = initiator_process(
                     &mut rng,
                     KKTMode::Mutual,
                     ciphersuite,
@@ -394,7 +394,7 @@ pub fn kkt_benchmark(c: &mut Criterion) {
                     },
                 );
 
-                let (mut r_context, r_obtained_key) = responder_ingest_message(
+                let (r_context, r_obtained_key) = responder_ingest_message(
                     &r_context,
                     Some(initiator_ed25519_keypair.public_key()),
                     Some(&i_dir_hash),
@@ -411,7 +411,7 @@ pub fn kkt_benchmark(c: &mut Criterion) {
                     |b| {
                         b.iter(|| {
                             responder_process(
-                                &mut r_context,
+                                &r_context,
                                 i_frame_r.session_id(),
                                 responder_ed25519_keypair.private_key(),
                                 &responder_kem_public_key,
@@ -422,7 +422,7 @@ pub fn kkt_benchmark(c: &mut Criterion) {
                 );
 
                 let r_frame = responder_process(
-                    &mut r_context,
+                    &r_context,
                     i_frame_r.session_id(),
                     responder_ed25519_keypair.private_key(),
                     &responder_kem_public_key,
@@ -445,7 +445,7 @@ pub fn kkt_benchmark(c: &mut Criterion) {
                     |b| {
                         b.iter(|| {
                             initiator_ingest_response(
-                                &mut i_context,
+                                &i_context,
                                 &r_frame,
                                 &r_frame.context().unwrap(),
                                 responder_ed25519_keypair.public_key(),
@@ -457,7 +457,7 @@ pub fn kkt_benchmark(c: &mut Criterion) {
                 );
 
                 let obtained_key = initiator_ingest_response(
-                    &mut i_context,
+                    &i_context,
                     &r_frame,
                     &r_frame.context().unwrap(),
                     responder_ed25519_keypair.public_key(),

common/nym-kkt/src/ciphersuite.rs

@@ -1,35 +1,10 @@
 // Copyright 2025 - Nym Technologies SA <contact@nymtech.net>
 // SPDX-License-Identifier: Apache-2.0
 
-use std::fmt::Display;
-
-use libcrux_kem::{Algorithm, MlKem768PublicKey};
-use nym_crypto::asymmetric::ed25519;
-
 use crate::error::KKTError;
+use libcrux_kem::Algorithm;
 
-pub const HASH_LEN_256: usize = 32;
-pub const CIPHERSUITE_ENCODING_LEN: usize = 4;
-
-pub const CURVE25519_KEY_LEN: usize = 32;
-
-#[derive(Clone, Copy, Debug, PartialEq)]
-pub enum HashFunction {
-    Blake3,
-    SHAKE128,
-    SHAKE256,
-    SHA256,
-}
-impl Display for HashFunction {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        f.write_str(match self {
-            HashFunction::Blake3 => "Blake3",
-            HashFunction::SHAKE128 => "SHAKE128",
-            HashFunction::SHAKE256 => "SHAKE256",
-            HashFunction::SHA256 => "SHA256",
-        })
-    }
-}
+pub use nym_kkt_ciphersuite::*;
 
 pub enum EncapsulationKey<'a> {
     MlKem768(libcrux_kem::PublicKey),
@@ -87,200 +62,6 @@ impl<'a> EncapsulationKey<'a> {
     }
 }
 
-#[derive(Clone, Copy, Debug, PartialEq)]
-pub enum SignatureScheme {
-    Ed25519,
-}
-impl Display for SignatureScheme {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        f.write_str(match self {
-            SignatureScheme::Ed25519 => "Ed25519",
-        })
-    }
-}
-
-#[derive(Clone, Copy, Debug, PartialEq)]
-pub enum KEM {
-    MlKem768,
-    XWing,
-    X25519,
-    McEliece,
-}
-
-impl Display for KEM {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        f.write_str(match self {
-            KEM::MlKem768 => "MlKem768",
-            KEM::XWing => "XWing",
-            KEM::X25519 => "x25519",
-            KEM::McEliece => "McEliece",
-        })
-    }
-}
-
-#[derive(Clone, Copy, Debug, PartialEq)]
-pub struct Ciphersuite {
-    hash_function: HashFunction,
-    signature_scheme: SignatureScheme,
-    kem: KEM,
-    hash_length: u8,
-    encapsulation_key_length: usize,
-    signing_key_length: usize,
-    verification_key_length: usize,
-    signature_length: usize,
-}
-
-impl Ciphersuite {
-    pub fn kem_key_len(&self) -> usize {
-        self.encapsulation_key_length
-    }
-
-    pub fn signature_len(&self) -> usize {
-        self.signature_length
-    }
-    pub fn signing_key_len(&self) -> usize {
-        self.signing_key_length
-    }
-    pub fn verification_key_len(&self) -> usize {
-        self.verification_key_length
-    }
-    pub fn hash_function(&self) -> HashFunction {
-        self.hash_function
-    }
-    pub fn kem(&self) -> KEM {
-        self.kem
-    }
-    pub fn signature_scheme(&self) -> SignatureScheme {
-        self.signature_scheme
-    }
-    pub fn hash_len(&self) -> usize {
-        self.hash_length as usize
-    }
-
-    pub fn resolve_ciphersuite(
-        kem: KEM,
-        hash_function: HashFunction,
-        signature_scheme: SignatureScheme,
-        // This should be None 99.9999% of the time
-        custom_hash_length: Option<u8>,
-    ) -> Result<Self, KKTError> {
-        let hash_len = match custom_hash_length {
-            Some(l) => {
-                if l < 16 {
-                    return Err(KKTError::InsecureHashLen);
-                } else {
-                    l
-                }
-            }
-            None => HASH_LEN_256 as u8,
-        };
-        Ok(Self {
-            hash_function,
-            signature_scheme,
-            kem,
-            hash_length: hash_len,
-            encapsulation_key_length: match kem {
-                // 1184 bytes
-                KEM::MlKem768 => MlKem768PublicKey::len(),
-                // 1216 bytes = 1184 + 32
-                KEM::XWing => MlKem768PublicKey::len() + CURVE25519_KEY_LEN,
-                // 32 bytes
-                KEM::X25519 => CURVE25519_KEY_LEN,
-                // 524160 bytes
-                KEM::McEliece => classic_mceliece_rust::CRYPTO_PUBLICKEYBYTES,
-            },
-            signing_key_length: match signature_scheme {
-                // 32 bytes
-                SignatureScheme::Ed25519 => ed25519::SECRET_KEY_LENGTH,
-            },
-            verification_key_length: match signature_scheme {
-                // 32 bytes
-                SignatureScheme::Ed25519 => ed25519::PUBLIC_KEY_LENGTH,
-            },
-            signature_length: match signature_scheme {
-                // 64 bytes
-                SignatureScheme::Ed25519 => ed25519::SIGNATURE_LENGTH,
-            },
-        })
-    }
-    pub fn encode(&self) -> [u8; CIPHERSUITE_ENCODING_LEN] {
-        // [kem, hash, hashlen, sig]
-        [
-            match self.kem {
-                KEM::XWing => 0,
-                KEM::MlKem768 => 1,
-                KEM::McEliece => 2,
-                KEM::X25519 => 255,
-            },
-            match self.hash_function {
-                HashFunction::Blake3 => 0,
-                HashFunction::SHAKE256 => 1,
-                HashFunction::SHAKE128 => 2,
-                HashFunction::SHA256 => 3,
-            },
-            match self.hash_length as usize {
-                HASH_LEN_256 => 0u8,
-                _ => self.hash_length,
-            },
-            match self.signature_scheme {
-                SignatureScheme::Ed25519 => 0,
-            },
-        ]
-    }
-    pub fn decode(encoding: [u8; CIPHERSUITE_ENCODING_LEN]) -> Result<Self, KKTError> {
-        let kem = match encoding[0] {
-            0 => KEM::XWing,
-            1 => KEM::MlKem768,
-            2 => KEM::McEliece,
-            255 => KEM::X25519,
-            _ => {
-                return Err(KKTError::CiphersuiteDecodingError {
-                    info: format!("Undefined KEM: {}", encoding[0]),
-                });
-            }
-        };
-        let hash_function = match encoding[1] {
-            0 => HashFunction::Blake3,
-            1 => HashFunction::SHAKE256,
-            2 => HashFunction::SHAKE128,
-            3 => HashFunction::SHA256,
-            _ => {
-                return Err(KKTError::CiphersuiteDecodingError {
-                    info: format!("Undefined Hash Function: {}", encoding[1]),
-                });
-            }
-        };
-
-        let custom_hash_length = match encoding[2] {
-            0 => None,
-            _ => Some(encoding[2]),
-        };
-
-        let signature_scheme = match encoding[3] {
-            0 => SignatureScheme::Ed25519,
-            _ => {
-                return Err(KKTError::CiphersuiteDecodingError {
-                    info: format!("Undefined Signature Scheme: {}", encoding[3]),
-                });
-            }
-        };
-
-        Self::resolve_ciphersuite(kem, hash_function, signature_scheme, custom_hash_length)
-    }
-}
-
-impl Display for Ciphersuite {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        f.write_str(
-            &format!(
-                "{}_{}({})_{}",
-                self.kem, self.hash_function, self.hash_length, self.signature_scheme
-            )
-            .to_ascii_lowercase(),
-        )
-    }
-}
-
 pub const fn map_kem_to_libcrux_kem(kem: KEM) -> Result<Algorithm, KKTError> {
     match kem {
         KEM::MlKem768 => Ok(Algorithm::MlKem768),

common/nym-kkt/src/context.rs

@@ -6,7 +6,7 @@ use crate::{KKT_VERSION, ciphersuite::Ciphersuite, error::KKTError, frame::KKT_S
 use num_enum::{IntoPrimitive, TryFromPrimitive};
 use std::fmt::Display;
 
-pub const KKT_CONTEXT_LEN: usize = 7;
+pub const KKT_CONTEXT_LEN: usize = 3 + CIPHERSUITE_ENCODING_LEN;
 
 // bitmask used: 0b1110_0000
 #[derive(Clone, Copy, PartialEq, Debug, IntoPrimitive, TryFromPrimitive)]
@@ -202,13 +202,11 @@ impl KKTContext {
             info: format!("Header - Invalid KKT Mode: {raw_kkt_mode}"),
         })?;
 
-        let ciphersuite_bytes = header_bytes[2..6].try_into().map_err(|_| {
-            KKTError::CiphersuiteDecodingError {
-                info: format!(
-                    "Incorrect Encoding Length: actual: 4 != expected: {CIPHERSUITE_ENCODING_LEN}",
-                ),
-            }
-        })?;
+        // SAFETY: we're taking exactly `CIPHERSUITE_ENCODING_LEN` bytes
+        #[allow(clippy::unwrap_used)]
+        let ciphersuite_bytes = header_bytes[2..2 + CIPHERSUITE_ENCODING_LEN]
+            .try_into()
+            .unwrap();
 
         Ok(KKTContext {
             version: kkt_version,

common/nym-kkt/src/encryption.rs

@@ -1,14 +1,11 @@
 // Copyright 2025-2026 - Nym Technologies SA <contact@nymtech.net>
 // SPDX-License-Identifier: Apache-2.0
 
-use crate::kkt::KKT_INITIAL_FRAME_AAD;
-use crate::{
-    ciphersuite::CURVE25519_KEY_LEN, context::KKTContext, error::KKTError, frame::KKTFrame,
-};
+use crate::{KKT_INITIAL_FRAME_AAD, context::KKTContext, error::KKTError, frame::KKTFrame};
 use blake3::Hasher;
 use libcrux_chacha20poly1305::{NONCE_LEN, TAG_LEN};
 use nym_crypto::asymmetric::x25519;
-use rand::{CryptoRng, RngCore};
+use rand09::{CryptoRng, RngCore};
 use zeroize::Zeroize;
 
 #[derive(Clone, Copy, Zeroize)]
@@ -36,7 +33,7 @@ impl KKTSessionSecret {
 
     fn try_derive(private_key: &x25519::PrivateKey, public_key: &[u8]) -> Result<Self, KKTError> {
         let mut pub_key: [u8; 32] = [0u8; 32];
-        pub_key.copy_from_slice(&public_key[0..CURVE25519_KEY_LEN]);
+        pub_key.copy_from_slice(&public_key[0..x25519::PUBLIC_KEY_SIZE]);
 
         // Todo: check validity of pk...
         let pk = x25519::PublicKey::from(pub_key);
@@ -71,7 +68,7 @@ where
     let mut encrypted_frame =
         encrypt_kkt_frame(rng, &session_secret_key, kkt_frame, KKT_INITIAL_FRAME_AAD)?;
 
-    let mut output_buffer = Vec::with_capacity(encrypted_frame.len() + CURVE25519_KEY_LEN);
+    let mut output_buffer = Vec::with_capacity(encrypted_frame.len() + x25519::PUBLIC_KEY_SIZE);
     output_buffer.extend_from_slice(ephemeral_public_key.as_bytes());
     output_buffer.append(&mut encrypted_frame);
 
@@ -84,19 +81,19 @@ pub fn decrypt_initial_kkt_frame(
     responder_private_key: &x25519::PrivateKey,
     encrypted_frame_bytes: &[u8],
 ) -> Result<(KKTSessionSecret, KKTFrame, KKTContext), KKTError> {
-    if encrypted_frame_bytes.len() < CURVE25519_KEY_LEN + TAG_LEN + NONCE_LEN {
+    if encrypted_frame_bytes.len() < x25519::PUBLIC_KEY_SIZE + TAG_LEN + NONCE_LEN {
         Err(KKTError::AEADError {
             info: "Encrypted KKT Frame is too short.",
         })
     } else {
         let shared_secret = KKTSessionSecret::try_derive(
             responder_private_key,
-            &encrypted_frame_bytes[0..CURVE25519_KEY_LEN],
+            &encrypted_frame_bytes[0..x25519::PUBLIC_KEY_SIZE],
         )?;
 
         let (kkt_frame, kkt_context) = decrypt_kkt_frame(
             &shared_secret,
-            &encrypted_frame_bytes[CURVE25519_KEY_LEN..],
+            &encrypted_frame_bytes[x25519::PUBLIC_KEY_SIZE..],
             KKT_INITIAL_FRAME_AAD,
         )?;
         Ok((shared_secret, kkt_frame, kkt_context))
@@ -181,12 +178,11 @@ mod test {
     use crate::encryption::{decrypt_kkt_frame, encrypt_kkt_frame};
     use crate::frame::{KKT_SESSION_ID_LEN, KKTFrame};
     use crate::{
-        ciphersuite::HASH_LEN_256,
+        ciphersuite::DEFAULT_HASH_LEN,
         encryption::{KKTSessionSecret, decrypt, encrypt},
         key_utils::generate_keypair_x25519,
     };
-    use rand::{RngCore, SeedableRng, rng};
-    use rand_chacha::ChaCha20Rng;
+    use rand09::{RngCore, SeedableRng, rng};
 
     #[test]
     fn test_keygen() {
@@ -209,7 +205,7 @@ mod test {
     fn test_encryption() {
         let mut rng = rng();
 
-        let mut secret_key = [0u8; HASH_LEN_256];
+        let mut secret_key = [0u8; DEFAULT_HASH_LEN];
         rng.fill_bytes(&mut secret_key);
 
         let mut plaintext = vec![0; 100];
@@ -230,7 +226,7 @@ mod test {
 
     #[test]
     fn kkt_frame_encryption() -> anyhow::Result<()> {
-        let mut rng = ChaCha20Rng::seed_from_u64(42);
+        let mut rng = rand_chacha::ChaCha20Rng::seed_from_u64(42);
         let session_key = KKTSessionSecret::from_bytes([42u8; 32]);
         let aad = b"my-amazing-aad";
 

common/nym-kkt/src/error.rs

@@ -1,19 +1,19 @@
 // Copyright 2025 - Nym Technologies SA <contact@nymtech.net>
 // SPDX-License-Identifier: Apache-2.0
 
+use crate::context::KKTStatus;
+use nym_kkt_ciphersuite::error::KKTCiphersuiteError;
 use std::fmt::Debug;
 use thiserror::Error;
 
-use crate::context::KKTStatus;
-
 #[derive(Error, Debug)]
 pub enum KKTError {
     #[error("Signature constructor error")]
     SigConstructorError,
     #[error("Signature verification error")]
     SigVerifError,
-    #[error("Ciphersuite Decoding Error: {}", info)]
-    CiphersuiteDecodingError { info: String },
+    #[error(transparent)]
+    CiphersuiteDecodingError(#[from] KKTCiphersuiteError),
 
     #[error("KEM mapping failure: {}", info)]
     KEMMapping { info: &'static str },

common/nym-kkt/src/key_utils.rs

@@ -1,9 +1,10 @@
 use crate::ciphersuite::HashFunction;
+use std::collections::HashMap;
 
 use classic_mceliece_rust::keypair_boxed;
 
-use libcrux_sha3;
-use rand::{CryptoRng, RngCore};
+use nym_kkt_ciphersuite::{DEFAULT_HASH_LEN, KeyDigests};
+use rand09::{CryptoRng, RngCore};
 
 pub fn generate_keypair_ed25519<R>(
     rng: &mut R,
@@ -60,7 +61,6 @@ pub fn generate_keypair_mceliece<'a, R>(
     classic_mceliece_rust::PublicKey<'a>,
 )
 where
-    // this is annoying because mceliece lib uses rand 0.8.5...
     R: RngCore + CryptoRng,
 {
     let (encapsulation_key, decapsulation_key) = keypair_boxed(rng);
@@ -72,26 +72,18 @@ pub fn hash_key_bytes(
     hash_length: usize,
     key_bytes: &[u8],
 ) -> Vec<u8> {
-    let mut hashed_key: Vec<u8> = vec![0u8; hash_length];
-    match hash_function {
-        HashFunction::Blake3 => {
-            let mut hasher = blake3::Hasher::new();
-            hasher.update(key_bytes);
-            hasher.finalize_xof().fill(&mut hashed_key);
-            hasher.reset();
-        }
-        HashFunction::SHAKE256 => {
-            libcrux_sha3::shake256_ema(&mut hashed_key, key_bytes);
-        }
-        HashFunction::SHAKE128 => {
-            libcrux_sha3::shake128_ema(&mut hashed_key, key_bytes);
-        }
-        HashFunction::SHA256 => {
-            libcrux_sha3::sha256_ema(&mut hashed_key, key_bytes);
-        }
-    }
+    hash_function.digest(key_bytes, hash_length)
+}
 
-    hashed_key
+/// attempt to produce digests of the provided key using all known [HashFunction] with a default
+/// hash length where variable output is available
+pub fn produce_key_digests(key_bytes: &[u8]) -> KeyDigests {
+    use strum::IntoEnumIterator;
+    let mut digests = HashMap::new();
+    for hash in HashFunction::iter() {
+        digests.insert(hash, hash.digest(key_bytes, DEFAULT_HASH_LEN));
+    }
+    digests
 }
 
 /// This does NOT run in constant time.

common/nym-kkt/src/kkt.rs

@@ -9,7 +9,7 @@
 //! The underlying KKT protocol is implemented in the `session` module.
 
 use nym_crypto::asymmetric::{ed25519, x25519};
-use rand::{CryptoRng, RngCore};
+use rand09::{CryptoRng, RngCore};
 
 use crate::{
     ciphersuite::{Ciphersuite, EncapsulationKey},
@@ -27,16 +27,13 @@ pub use crate::session::{
 use crate::encryption::{KKTSessionSecret, encrypt_initial_kkt_frame};
 use crate::frame::KKTFrame;
 
-pub(crate) const KKT_RESPONSE_AAD: &[u8] = b"KKT_Response";
-pub(crate) const KKT_INITIAL_FRAME_AAD: &[u8] = b"KKT_INITIAL_FRAME";
-
 /// Perform an *Encrypted* request for a KEM public key from a responder (OneWay mode).
 ///
 /// This is the client-side operation that initiates a KKT exchange.
 /// The request will be signed with the provided signing key.
 ///
 /// # Arguments
-/// * `rng` - Random number generator
+/// * `rng` - random number generator
 /// * `ciphersuite` - Negotiated ciphersuite (KEM, hash, signature algorithms)
 /// * `signing_key` - Client's Ed25519 signing key for authentication
 /// * `responder_dh_public_key` - Responder's long-term x25519 Diffie-Hellman public key
@@ -93,7 +90,7 @@ pub fn request_kem_key<R: CryptoRng + RngCore>(
 /// # Example
 /// ```ignore
 /// let gateway_kem_key = validate_kem_response(
-///     &mut context,
+///     &context,
 ///     &session_secret,
 ///     &gateway_verification_key,
 ///     &expected_hash_from_directory,
@@ -202,14 +199,14 @@ mod tests {
 
     fn random_x25519_key() -> x25519::PrivateKey {
         let mut bytes = [0u8; 32];
-        let mut rng = rand::rng();
+        let mut rng = rand09::rng();
         rng.fill_bytes(&mut bytes);
         x25519::PrivateKey::from_secret(bytes)
     }
 
     #[test]
     fn test_kkt_wrappers_oneway_authenticated() {
-        let mut rng = rand::rng();
+        let mut rng = rand09::rng();
 
         // Generate Ed25519 keypairs for both parties
         let mut initiator_secret = [0u8; 32];
@@ -244,7 +241,7 @@ mod tests {
         );
 
         // Client: Request KEM key
-        let (session_key, mut context, request_frame_ciphertext) = request_kem_key(
+        let (session_key, context, request_frame_ciphertext) = request_kem_key(
             &mut rng,
             ciphersuite,
             ed25519_init.private_key(),
@@ -265,7 +262,7 @@ mod tests {
 
         // Client: Validate response
         let obtained_key = validate_kem_response(
-            &mut context,
+            &context,
             &session_key,
             ed25519_resp.public_key(),
             &key_hash,
@@ -279,7 +276,7 @@ mod tests {
 
     #[test]
     fn test_kkt_wrappers_anonymous() {
-        let mut rng = rand::rng();
+        let mut rng = rand09::rng();
 
         // Only responder has keys
         let mut responder_secret = [0u8; 32];
@@ -307,8 +304,7 @@ mod tests {
         );
 
         // Anonymous initiator
-        let (mut context, request_frame) =
-            anonymous_initiator_process(&mut rng, ciphersuite).unwrap();
+        let (context, request_frame) = anonymous_initiator_process(&mut rng, ciphersuite).unwrap();
 
         // Generate the session's shared secret and encrypt the Initiator's request
         let (session_secret, encrypted_request_bytes) =
@@ -327,7 +323,7 @@ mod tests {
 
         // Initiator: Validate response
         let obtained_key = validate_kem_response(
-            &mut context,
+            &context,
             &session_secret,
             responder_keypair.public_key(),
             &key_hash,
@@ -340,7 +336,7 @@ mod tests {
 
     #[test]
     fn test_invalid_signature_rejected() {
-        let mut rng = rand::rng();
+        let mut rng = rand09::rng();
 
         let mut initiator_secret = [0u8; 32];
         rng.fill_bytes(&mut initiator_secret);
@@ -393,7 +389,7 @@ mod tests {
 
     #[test]
     fn test_hash_mismatch_rejected() {
-        let mut rng = rand::rng();
+        let mut rng = rand09::rng();
 
         let mut initiator_secret = [0u8; 32];
         rng.fill_bytes(&mut initiator_secret);
@@ -420,7 +416,7 @@ mod tests {
         // Use WRONG hash
         let wrong_hash = [0u8; 32];
 
-        let (session_key, mut context, request_frame) = request_kem_key(
+        let (session_key, context, request_frame) = request_kem_key(
             &mut rng,
             ciphersuite,
             initiator_keypair.private_key(),
@@ -440,7 +436,7 @@ mod tests {
 
         // Client validates with WRONG hash
         let result = validate_kem_response(
-            &mut context,
+            &context,
             &session_key,
             responder_keypair.public_key(),
             &wrong_hash, // Wrong!

common/nym-kkt/src/lib.rs

@@ -7,17 +7,19 @@ pub mod encryption;
 pub mod error;
 pub mod frame;
 pub mod key_utils;
-pub mod kkt;
+// pub mod kkt;
 pub mod session;
 
 // This must be less than 4 bits
 pub const KKT_VERSION: u8 = 1;
 const _: () = assert!(KKT_VERSION < 1 << 4);
+pub const KKT_RESPONSE_AAD: &[u8] = b"KKT_Response";
+pub(crate) const KKT_INITIAL_FRAME_AAD: &[u8] = b"KKT_INITIAL_FRAME";
 
 #[cfg(test)]
 mod test {
-    use crate::kkt::KKT_RESPONSE_AAD;
     use crate::{
+        KKT_RESPONSE_AAD,
         ciphersuite::{Ciphersuite, EncapsulationKey, HashFunction, KEM},
         encryption::{
             decrypt_initial_kkt_frame, decrypt_kkt_frame, encrypt_initial_kkt_frame,
@@ -36,7 +38,7 @@ mod test {
 
     #[test]
     fn test_kkt_psq_e2e_clear() {
-        let mut rng = rand::rng();
+        let mut rng = rand09::rng();
 
         // generate ed25519 keys
         let initiator_ed25519_keypair = generate_keypair_ed25519(&mut rng, Some(0));
@@ -46,8 +48,8 @@ mod test {
             for hash_function in [
                 HashFunction::Blake3,
                 HashFunction::SHA256,
-                HashFunction::SHAKE128,
-                HashFunction::SHAKE256,
+                HashFunction::Shake128,
+                HashFunction::Shake256,
             ] {
                 let ciphersuite = Ciphersuite::resolve_ciphersuite(
                     kem,
@@ -104,18 +106,18 @@ mod test {
 
                 // Anonymous Initiator, OneWay
                 {
-                    let (mut i_context, i_frame) =
+                    let (i_context, i_frame) =
                         anonymous_initiator_process(&mut rng, ciphersuite).unwrap();
 
                     let i_frame_bytes = i_frame.to_bytes();
 
                     let (i_frame_r, r_context) = KKTFrame::from_bytes(&i_frame_bytes).unwrap();
 
-                    let (mut r_context, _) =
+                    let (r_context, _) =
                         responder_ingest_message(&r_context, None, None, &i_frame_r).unwrap();
 
                     let r_frame = responder_process(
-                        &mut r_context,
+                        &r_context,
                         i_frame_r.session_id(),
                         responder_ed25519_keypair.private_key(),
                         &responder_kem_public_key,
@@ -127,7 +129,7 @@ mod test {
                     let (i_frame_r, i_context_r) = KKTFrame::from_bytes(&r_bytes).unwrap();
 
                     let i_obtained_key = initiator_ingest_response(
-                        &mut i_context,
+                        &i_context,
                         &i_frame_r,
                         &i_context_r,
                         responder_ed25519_keypair.public_key(),
@@ -139,7 +141,7 @@ mod test {
                 }
                 // Initiator, OneWay
                 {
-                    let (mut i_context, i_frame) = initiator_process(
+                    let (i_context, i_frame) = initiator_process(
                         &mut rng,
                         crate::context::KKTMode::OneWay,
                         ciphersuite,
@@ -152,7 +154,7 @@ mod test {
 
                     let (i_frame_r, r_context) = KKTFrame::from_bytes(&i_frame_bytes).unwrap();
 
-                    let (mut r_context, r_obtained_key) = responder_ingest_message(
+                    let (r_context, r_obtained_key) = responder_ingest_message(
                         &r_context,
                         Some(initiator_ed25519_keypair.public_key()),
                         None,
@@ -163,7 +165,7 @@ mod test {
                     assert!(r_obtained_key.is_none());
 
                     let r_frame = responder_process(
-                        &mut r_context,
+                        &r_context,
                         i_frame_r.session_id(),
                         responder_ed25519_keypair.private_key(),
                         &responder_kem_public_key,
@@ -175,7 +177,7 @@ mod test {
                     let (i_frame_r, i_context_r) = KKTFrame::from_bytes(&r_bytes).unwrap();
 
                     let i_obtained_key = initiator_ingest_response(
-                        &mut i_context,
+                        &i_context,
                         &i_frame_r,
                         &i_context_r,
                         responder_ed25519_keypair.public_key(),
@@ -188,7 +190,7 @@ mod test {
 
                 // Initiator, Mutual
                 {
-                    let (mut i_context, i_frame) = initiator_process(
+                    let (i_context, i_frame) = initiator_process(
                         &mut rng,
                         crate::context::KKTMode::Mutual,
                         ciphersuite,
@@ -201,7 +203,7 @@ mod test {
 
                     let (i_frame_r, r_context) = KKTFrame::from_bytes(&i_frame_bytes).unwrap();
 
-                    let (mut r_context, r_obtained_key) = responder_ingest_message(
+                    let (r_context, r_obtained_key) = responder_ingest_message(
                         &r_context,
                         Some(initiator_ed25519_keypair.public_key()),
                         Some(&i_dir_hash),
@@ -212,7 +214,7 @@ mod test {
                     assert_eq!(r_obtained_key.unwrap().encode(), i_kem_key_bytes);
 
                     let r_frame = responder_process(
-                        &mut r_context,
+                        &r_context,
                         i_frame_r.session_id(),
                         responder_ed25519_keypair.private_key(),
                         &responder_kem_public_key,
@@ -224,7 +226,7 @@ mod test {
                     let (i_frame_r, i_context_r) = KKTFrame::from_bytes(&r_bytes).unwrap();
 
                     let i_obtained_key = initiator_ingest_response(
-                        &mut i_context,
+                        &i_context,
                         &i_frame_r,
                         &i_context_r,
                         responder_ed25519_keypair.public_key(),
@@ -239,7 +241,7 @@ mod test {
     }
     #[test]
     fn test_kkt_psq_e2e_encrypted() {
-        let mut rng = rand::rng();
+        let mut rng = rand09::rng();
 
         // generate ed25519 keys
         let initiator_ed25519_keypair = generate_keypair_ed25519(&mut rng, Some(0));
@@ -252,8 +254,8 @@ mod test {
             for hash_function in [
                 HashFunction::Blake3,
                 HashFunction::SHA256,
-                HashFunction::SHAKE128,
-                HashFunction::SHAKE256,
+                HashFunction::Shake128,
+                HashFunction::Shake256,
             ] {
                 let ciphersuite = Ciphersuite::resolve_ciphersuite(
                     kem,
@@ -310,7 +312,7 @@ mod test {
 
                 // Anonymous Initiator, OneWay
                 {
-                    let (mut i_context, i_frame) =
+                    let (i_context, i_frame) =
                         anonymous_initiator_process(&mut rng, ciphersuite).unwrap();
 
                     // encryption - initiator frame
@@ -328,11 +330,11 @@ mod test {
                         decrypt_initial_kkt_frame(responder_x25519_keypair.private_key(), &i_bytes)
                             .unwrap();
 
-                    let (mut r_context, _) =
+                    let (r_context, _) =
                         responder_ingest_message(&i_context_r, None, None, &i_frame_r).unwrap();
 
                     let r_frame = responder_process(
-                        &mut r_context,
+                        &r_context,
                         i_frame_r.session_id(),
                         responder_ed25519_keypair.private_key(),
                         &responder_kem_public_key,
@@ -350,7 +352,7 @@ mod test {
                         decrypt_kkt_frame(&i_session_secret, &r_bytes, KKT_RESPONSE_AAD).unwrap();
 
                     let i_obtained_key = initiator_ingest_response(
-                        &mut i_context,
+                        &i_context,
                         &i_frame_r,
                         &i_context_r,
                         responder_ed25519_keypair.public_key(),
@@ -362,7 +364,7 @@ mod test {
                 }
                 // Initiator, OneWay
                 {
-                    let (mut i_context, i_frame) = initiator_process(
+                    let (i_context, i_frame) = initiator_process(
                         &mut rng,
                         crate::context::KKTMode::OneWay,
                         ciphersuite,
@@ -386,7 +388,7 @@ mod test {
                         decrypt_initial_kkt_frame(responder_x25519_keypair.private_key(), &i_bytes)
                             .unwrap();
 
-                    let (mut r_context, r_obtained_key) = responder_ingest_message(
+                    let (r_context, r_obtained_key) = responder_ingest_message(
                         &r_context,
                         Some(initiator_ed25519_keypair.public_key()),
                         None,
@@ -397,7 +399,7 @@ mod test {
                     assert!(r_obtained_key.is_none());
 
                     let r_frame = responder_process(
-                        &mut r_context,
+                        &r_context,
                         i_frame_r.session_id(),
                         responder_ed25519_keypair.private_key(),
                         &responder_kem_public_key,
@@ -415,7 +417,7 @@ mod test {
                         decrypt_kkt_frame(&i_session_secret, &r_bytes, KKT_RESPONSE_AAD).unwrap();
 
                     let i_obtained_key = initiator_ingest_response(
-                        &mut i_context,
+                        &i_context,
                         &i_frame_r,
                         &i_context_r,
                         responder_ed25519_keypair.public_key(),
@@ -428,7 +430,7 @@ mod test {
 
                 // Initiator, Mutual
                 {
-                    let (mut i_context, i_frame) = initiator_process(
+                    let (i_context, i_frame) = initiator_process(
                         &mut rng,
                         crate::context::KKTMode::Mutual,
                         ciphersuite,
@@ -452,7 +454,7 @@ mod test {
                         decrypt_initial_kkt_frame(responder_x25519_keypair.private_key(), &i_bytes)
                             .unwrap();
 
-                    let (mut r_context, r_obtained_key) = responder_ingest_message(
+                    let (r_context, r_obtained_key) = responder_ingest_message(
                         &i_context_r,
                         Some(initiator_ed25519_keypair.public_key()),
                         Some(&i_dir_hash),
@@ -463,7 +465,7 @@ mod test {
                     assert_eq!(r_obtained_key.unwrap().encode(), i_kem_key_bytes);
 
                     let r_frame = responder_process(
-                        &mut r_context,
+                        &r_context,
                         i_frame_r.session_id(),
                         responder_ed25519_keypair.private_key(),
                         &responder_kem_public_key,
@@ -481,7 +483,7 @@ mod test {
                         decrypt_kkt_frame(&i_session_secret, &r_bytes, KKT_RESPONSE_AAD).unwrap();
 
                     let i_obtained_key = initiator_ingest_response(
-                        &mut i_context,
+                        &i_context,
                         &i_frame_r,
                         &i_context_r,
                         responder_ed25519_keypair.public_key(),

common/nym-kkt/src/session.rs

@@ -1,5 +1,5 @@
 use nym_crypto::asymmetric::ed25519::{self, Signature};
-use rand::{CryptoRng, RngCore};
+use rand09::{CryptoRng, RngCore};
 
 use crate::frame::KKTSessionId;
 use crate::{
@@ -73,7 +73,7 @@ where
 }
 
 pub fn initiator_ingest_response<'a>(
-    own_context: &mut KKTContext,
+    own_context: &KKTContext,
     remote_frame: &KKTFrame,
     remote_context: &KKTContext,
     remote_verification_key: &ed25519::PublicKey,
@@ -201,7 +201,7 @@ pub fn responder_ingest_message<'a>(
 }
 
 pub fn responder_process<'a>(
-    own_context: &mut KKTContext,
+    own_context: &KKTContext,
     session_id: KKTSessionId,
     signing_key: &ed25519::PrivateKey,
     encapsulation_key: &EncapsulationKey<'a>,

common/nym-lp-transport/Cargo.toml

@@ -12,8 +12,9 @@ readme.workspace = true
 publish = false
 
 [dependencies]
-tokio = { workspace = true, features = ["net"] }
+tokio = { workspace = true, features = ["net", "io-util"] }
 nym-test-utils = { path = "../test-utils", optional = true }
+tracing = { workspace = true }
 
 [features]
 io-mocks = ["nym-test-utils"]

common/nym-lp-transport/src/traits.rs

@@ -4,15 +4,100 @@
 #[cfg(feature = "io-mocks")]
 use nym_test_utils::mocks::async_read_write::MockIOStream;
 use std::net::SocketAddr;
-use tokio::io::{AsyncRead, AsyncWrite};
+use tokio::io::{AsyncRead, AsyncReadExt, AsyncWrite, AsyncWriteExt};
 use tokio::net::TcpStream;
+use tracing::debug;
 
 // only used in internal code (and tests)
 #[allow(async_fn_in_trait)]
-pub trait LpTransport: AsyncRead + AsyncWrite + Sized {
+pub trait LpTransport: Sized {
     async fn connect(endpoint: SocketAddr) -> std::io::Result<Self>;
 
     fn set_no_delay(&mut self, nodelay: bool) -> std::io::Result<()>;
+
+    /// Sends a serialised (and optionally encrypted) LP packet over the data stream with length-prefixed framing.
+    ///
+    /// Format: 4-byte big-endian u32 length + packet bytes
+    ///
+    /// # Arguments
+    /// * `packet_data` - The serialised LP packet to send
+    ///
+    /// # Errors
+    /// Returns an error on network transmission fails.
+    async fn send_serialised_packet(&mut self, packet_data: &[u8]) -> std::io::Result<()>;
+
+    /// Receives an LP packet from a TCP stream with length-prefixed framing.
+    ///
+    /// Format: 4-byte big-endian u32 length + packet bytes
+    ///
+    /// # Errors
+    /// Returns an error on network transmission fails.
+    async fn receive_raw_packet(&mut self) -> std::io::Result<Vec<u8>>;
+}
+
+async fn send_serialised_packet_async_write<W>(
+    writer: &mut W,
+    packet_data: &[u8],
+) -> std::io::Result<()>
+where
+    W: AsyncWrite + Unpin,
+{
+    // Send 4-byte length prefix (u32 big-endian)
+    let len = packet_data.len() as u32;
+    writer
+        .write_all(&len.to_be_bytes())
+        .await
+        .inspect_err(|e| debug!("Failed to send packet length: {e}"))?;
+
+    // Send the actual packet data
+    writer
+        .write_all(packet_data)
+        .await
+        .inspect_err(|e| debug!("Failed to send packet data: {e}"))?;
+
+    // Flush to ensure data is sent immediately
+    writer
+        .flush()
+        .await
+        .inspect_err(|e| debug!("Failed to flush stream: {e}"))?;
+
+    tracing::trace!(
+        "Sent LP packet ({} bytes + 4 byte header)",
+        packet_data.len()
+    );
+    Ok(())
+}
+
+async fn receive_raw_packet_async_read<R>(reader: &mut R) -> std::io::Result<Vec<u8>>
+where
+    R: AsyncRead + Unpin,
+{
+    // Read 4-byte length prefix (u32 big-endian)
+    let mut len_buf = [0u8; 4];
+    reader
+        .read_exact(&mut len_buf)
+        .await
+        .inspect_err(|e| debug!("Failed to read packet length: {e}"))?;
+
+    let packet_len = u32::from_be_bytes(len_buf) as usize;
+
+    // Sanity check to prevent huge allocations
+    const MAX_PACKET_SIZE: usize = 65536; // 64KB max
+    if packet_len > MAX_PACKET_SIZE {
+        return Err(std::io::Error::other(format!(
+            "Packet size {packet_len} exceeds maximum {MAX_PACKET_SIZE}",
+        )));
+    }
+
+    // Read the actual packet data
+    let mut packet_buf = vec![0u8; packet_len];
+    reader
+        .read_exact(&mut packet_buf)
+        .await
+        .inspect_err(|e| debug!("Failed to read packet data: {e}"))?;
+
+    tracing::trace!("Received LP packet ({packet_len} bytes + 4 byte header)");
+    Ok(packet_buf)
 }
 
 impl LpTransport for TcpStream {
@@ -24,6 +109,14 @@ impl LpTransport for TcpStream {
         // Set TCP_NODELAY for low latency
         self.set_nodelay(nodelay)
     }
+
+    async fn send_serialised_packet(&mut self, packet_data: &[u8]) -> std::io::Result<()> {
+        send_serialised_packet_async_write(self, packet_data).await
+    }
+
+    async fn receive_raw_packet(&mut self) -> std::io::Result<Vec<u8>> {
+        receive_raw_packet_async_read(self).await
+    }
 }
 
 #[cfg(feature = "io-mocks")]
@@ -35,4 +128,12 @@ impl LpTransport for MockIOStream {
     fn set_no_delay(&mut self, _nodelay: bool) -> std::io::Result<()> {
         Ok(())
     }
+
+    async fn send_serialised_packet(&mut self, packet_data: &[u8]) -> std::io::Result<()> {
+        send_serialised_packet_async_write(self, packet_data).await
+    }
+
+    async fn receive_raw_packet(&mut self) -> std::io::Result<Vec<u8>> {
+        receive_raw_packet_async_read(self).await
+    }
 }

common/nym-lp/Cargo.toml

@@ -17,11 +17,12 @@ sha2 = { workspace = true }
 tracing = { workspace = true }
 rand = { workspace = true }
 # rand 0.9 for KKT integration (nym-kkt uses rand 0.9)
-rand09 = { package = "rand", version = "0.9.2" }
+rand09 = { workspace = true }
 
 nym-crypto = { path = "../crypto", features = ["hashing", "asymmetric"] }
 nym-kkt = { path = "../nym-kkt" }
 nym-lp-common = { path = "../nym-lp-common" }
+nym-lp-transport = { path = "../nym-lp-transport" }
 
 # libcrux dependencies for PSQ (Post-Quantum PSK derivation)
 libcrux-psq = { git = "https://github.com/cryspen/libcrux", features = [
@@ -34,11 +35,21 @@ num_enum = { workspace = true }
 chacha20poly1305 = { workspace = true }
 zeroize = { workspace = true, features = ["zeroize_derive"] }
 
+# needed for the 'mock 'feature
+nym-test-utils = { workspace = true, optional = true }
+
 [dev-dependencies]
 criterion = { version = "0.5", features = ["html_reports"] }
-rand_chacha = "0.3"
+#rand_chacha = "0.3"
+mock_instant = { workspace = true }
 nym-crypto = { path = "../crypto", features = ["rand"] }
+nym-test-utils = { workspace = true }
+anyhow = { workspace = true }
+tokio = { workspace = true, features = ["rt-multi-thread", "macros"] }
+nym-lp-transport = { path = "../nym-lp-transport", features = ["io-mocks"] }
 
+[features]
+mock = ["nym-test-utils", "nym-crypto/rand"]
 
 [[bench]]
 name = "replay_protection"

common/nym-lp/benches/replay_protection.rs

@@ -1,8 +1,8 @@
 use criterion::{BenchmarkId, Criterion, Throughput, black_box, criterion_group, criterion_main};
 use nym_lp::replay::ReceivingKeyCounterValidator;
+use nym_test_utils::helpers::u64_seeded_rng;
 use parking_lot::Mutex;
-use rand::{Rng, SeedableRng};
-use rand_chacha::ChaCha8Rng;
+use rand::Rng;
 use std::sync::Arc;
 
 fn bench_sequential_counters(c: &mut Criterion) {
@@ -47,7 +47,7 @@ fn bench_out_of_order_counters(c: &mut Criterion) {
                 let validator = ReceivingKeyCounterValidator::default();
 
                 // Create random counters within a valid window
-                let mut rng = ChaCha8Rng::seed_from_u64(42);
+                let mut rng = u64_seeded_rng(42);
                 let counters: Vec<u64> = (0..size).map(|_| rng.gen_range(0..1024)).collect();
 
                 b.iter(|| {

common/nym-lp/src/codec.rs

@@ -555,7 +555,7 @@ mod tests {
         buf.extend_from_slice(&[1, 0, 0, 0]); // Version + reserved
         buf.extend_from_slice(&42u32.to_le_bytes()); // Sender index
         buf.extend_from_slice(&123u64.to_le_bytes()); // Counter
-        buf.extend_from_slice(&255u16.to_le_bytes()); // Invalid message type
+        buf.extend_from_slice(&231u16.to_le_bytes()); // Invalid message type
         // Need payload and trailer to meet min_size requirement
         let payload_size = 10; // Arbitrary
         buf.extend_from_slice(&vec![0u8; payload_size]); // Some data
@@ -565,7 +565,7 @@ mod tests {
         let result = parse_lp_packet(&buf, None);
         assert!(result.is_err());
         match result {
-            Err(LpError::InvalidMessageType(255)) => {} // Expected error
+            Err(LpError::InvalidMessageType(231)) => {} // Expected error
             Err(e) => panic!("Expected InvalidMessageType error, got {:?}", e),
             Ok(_) => panic!("Expected error, but got Ok"),
         }
@@ -628,7 +628,7 @@ mod tests {
                 receiver_idx: 42,
                 counter: 123,
             },
-            message: LpMessage::ClientHello(hello_data.clone()),
+            message: LpMessage::ClientHello(hello_data),
             trailer: [0; TRAILER_LEN],
         };
 
@@ -681,7 +681,7 @@ mod tests {
                 receiver_idx: 100,
                 counter: 200,
             },
-            message: LpMessage::ClientHello(hello_data.clone()),
+            message: LpMessage::ClientHello(hello_data),
             trailer: [55; TRAILER_LEN],
         };
 
@@ -757,12 +757,12 @@ mod tests {
     }
 
     #[test]
-    fn test_forward_packet_encode_decode_roundtrip() {
+    fn test_forward_packet_encode_decode_roundtrip_v4() {
         let mut dst = BytesMut::new();
 
         let forward_data = crate::message::ForwardPacketData {
             target_gateway_identity: [77u8; 32],
-            target_lp_address: "1.2.3.4:41264".to_string(),
+            target_lp_address: "1.2.3.4:41264".parse().unwrap(),
             inner_packet_bytes: vec![0xa, 0xb, 0xc, 0xd],
         };
 
@@ -789,7 +789,50 @@ mod tests {
 
         if let LpMessage::ForwardPacket(data) = decoded.message {
             assert_eq!(data.target_gateway_identity, [77u8; 32]);
-            assert_eq!(data.target_lp_address, "1.2.3.4:41264");
+            assert_eq!(data.target_lp_address, "1.2.3.4:41264".parse().unwrap());
+            assert_eq!(data.inner_packet_bytes, vec![0xa, 0xb, 0xc, 0xd]);
+        } else {
+            panic!("Expected ForwardPacket message");
+        }
+    }
+
+    #[test]
+    fn test_forward_packet_encode_decode_roundtrip_v6() {
+        let mut dst = BytesMut::new();
+
+        let forward_data = crate::message::ForwardPacketData {
+            target_gateway_identity: [77u8; 32],
+            target_lp_address: "[dead:beef:4242:c0ff:ee00::1111]:41264".parse().unwrap(),
+            inner_packet_bytes: vec![0xa, 0xb, 0xc, 0xd],
+        };
+
+        let packet = LpPacket {
+            header: LpHeader {
+                protocol_version: 1,
+                reserved: [0u8; 3],
+                receiver_idx: 999,
+                counter: 555,
+            },
+            message: LpMessage::ForwardPacket(forward_data),
+            trailer: [0xff; TRAILER_LEN],
+        };
+
+        // Serialize
+        serialize_lp_packet(&packet, &mut dst, None).unwrap();
+
+        // Parse back
+        let decoded = parse_lp_packet(&dst, None).unwrap();
+
+        // Verify LP protocol handling works correctly
+        assert_eq!(decoded.header.receiver_idx, 999);
+        assert!(matches!(decoded.message.typ(), MessageType::ForwardPacket));
+
+        if let LpMessage::ForwardPacket(data) = decoded.message {
+            assert_eq!(data.target_gateway_identity, [77u8; 32]);
+            assert_eq!(
+                data.target_lp_address,
+                "[dead:beef:4242:c0ff:ee00::1111]:41264".parse().unwrap()
+            );
             assert_eq!(data.inner_packet_bytes, vec![0xa, 0xb, 0xc, 0xd]);
         } else {
             panic!("Expected ForwardPacket message");
@@ -1246,4 +1289,37 @@ mod tests {
             _ => panic!("Expected SubsessionKK1 message"),
         }
     }
+
+    #[test]
+    fn test_serialize_parse_error() {
+        use crate::message::ErrorPacketData;
+
+        let mut dst = BytesMut::new();
+
+        let error_data = ErrorPacketData {
+            message: "this is an error".to_string(),
+        };
+
+        let packet = LpPacket {
+            header: LpHeader {
+                protocol_version: 1,
+                reserved: [0u8; 3],
+                receiver_idx: 42,
+                counter: 200,
+            },
+            message: LpMessage::Error(error_data.clone()),
+            trailer: [0; TRAILER_LEN],
+        };
+
+        serialize_lp_packet(&packet, &mut dst, None).unwrap();
+        let decoded = parse_lp_packet(&dst, None).unwrap();
+
+        assert_eq!(decoded.header.receiver_idx, 42);
+        match decoded.message {
+            LpMessage::Error(data) => {
+                assert_eq!(data.message, "this is an error");
+            }
+            _ => panic!("Expected Error message"),
+        }
+    }
 }

common/nym-lp/src/error.rs

@@ -1,8 +1,11 @@
 // Copyright 2025 - Nym Technologies SA <contact@nymtech.net>
 // SPDX-License-Identifier: Apache-2.0
 
+use crate::message::MessageType;
 use crate::{noise_protocol::NoiseError, replay::ReplayError};
 use nym_crypto::asymmetric::ed25519::Ed25519RecoveryError;
+use nym_kkt::ciphersuite::{HashFunction, KEM};
+use nym_kkt::error::KKTError;
 use thiserror::Error;
 
 #[derive(Error, Debug)]
@@ -90,4 +93,36 @@ pub enum LpError {
     /// Received an LP packet with an incompatible, legacy, version
     #[error("incompatible LP packet version. got: {got}, lowest supported: {lowest_supported}")]
     IncompatibleLegacyPacketVersion { got: u8, lowest_supported: u8 },
+
+    #[error("attempted to create an LP responder without providing a valid KEM key")]
+    ResponderWithMissingKEMKey,
+
+    #[error(
+        "there are no known digests for remote's KEM key with {kem} KEM and {hash_function} hash function"
+    )]
+    NoKnownKEMKeyDigests {
+        kem: KEM,
+        hash_function: HashFunction,
+    },
+
+    #[error("failed to complete KKT/PSQ handshake: {0}")]
+    KKTPSQHandshake(String),
+
+    #[error("failed to complete the KKT exchange: {source}")]
+    KKTFailure {
+        #[from]
+        source: KKTError,
+    },
+}
+
+impl LpError {
+    pub fn kkt_psq_handshake(msg: impl Into<String>) -> Self {
+        Self::KKTPSQHandshake(msg.into())
+    }
+
+    pub fn unexpected_handshake_response(got: MessageType, expected: MessageType) -> LpError {
+        Self::KKTPSQHandshake(format!(
+            "received unexpected response, got: {got:?}, expected: {expected:?}"
+        ))
+    }
 }

common/nym-lp/src/kkt_orchestrator.rs

@@ -184,6 +184,7 @@ pub fn handle_request<'a>(
 #[cfg(test)]
 mod tests {
     use super::*;
+    use crate::peer::mock_peers;
     use nym_kkt::ciphersuite::{HashFunction, KEM, SignatureScheme};
     use nym_kkt::key_utils::{
         generate_keypair_ed25519, generate_keypair_libcrux, generate_keypair_x25519,
@@ -362,16 +363,8 @@ mod tests {
 
     #[test]
     fn test_hash_mismatch_rejected() {
-        let mut rng = rand09::rng();
-
-        // Generate Ed25519 keypairs for both parties
-        let initiator_ed25519_keypair = generate_keypair_ed25519(&mut rng, Some(0));
-        let responder_ed25519_keypair = generate_keypair_ed25519(&mut rng, Some(1));
-
-        let responder_x25519 = generate_keypair_x25519(&mut rng);
-
-        let (_, responder_kem_pk) = generate_keypair_libcrux(&mut rng, KEM::X25519).unwrap();
-        let responder_kem_key = EncapsulationKey::X25519(responder_kem_pk);
+        let (init, resp) = mock_peers();
+        let responder_kem_key = resp.encapsulate_kem_key().unwrap();
 
         let ciphersuite = Ciphersuite::resolve_ciphersuite(
             KEM::X25519,
@@ -386,16 +379,16 @@ mod tests {
 
         let (session_secret, context, request_data) = create_request(
             ciphersuite,
-            initiator_ed25519_keypair.private_key(),
-            responder_x25519.public_key(),
+            init.ed25519.private_key(),
+            resp.x25519.public_key(),
         )
         .unwrap();
 
         let response_data = handle_request(
             &request_data,
-            Some(initiator_ed25519_keypair.public_key()),
-            responder_ed25519_keypair.private_key(),
-            responder_x25519.private_key(),
+            Some(init.ed25519.public_key()),
+            resp.ed25519.private_key(),
+            resp.x25519.private_key(),
             &responder_kem_key,
         )
         .unwrap();
@@ -404,7 +397,7 @@ mod tests {
         let result = process_response(
             context,
             &session_secret,
-            responder_ed25519_keypair.public_key(),
+            resp.ed25519.public_key(),
             &wrong_hash, // Wrong!
             &response_data,
         );

common/nym-lp/src/lib.rs

@@ -4,11 +4,13 @@
 pub mod codec;
 pub mod config;
 pub mod error;
-pub mod kkt_orchestrator;
+// pub mod kkt_orchestrator;
 pub mod message;
 pub mod noise_protocol;
 pub mod packet;
+pub mod peer;
 pub mod psk;
+mod psq;
 pub mod replay;
 pub mod session;
 mod session_integration;
@@ -20,61 +22,139 @@ pub use error::LpError;
 pub use message::{ClientHelloData, LpMessage};
 pub use packet::{BOOTSTRAP_RECEIVER_IDX, LpPacket, OuterHeader};
 pub use replay::{ReceivingKeyCounterValidator, ReplayError};
-pub use session::{LpSession, generate_fresh_salt};
+pub use session::LpSession;
 pub use session_manager::SessionManager;
 pub use state_machine::LpStateMachine;
 
 pub const NOISE_PATTERN: &str = "Noise_XKpsk3_25519_ChaChaPoly_SHA256";
 pub const NOISE_PSK_INDEX: u8 = 3;
 
-#[cfg(test)]
+#[cfg(any(feature = "mock", test))]
+pub struct SessionsMock {
+    pub initiator: LpSession,
+    pub responder: LpSession,
+}
+
+#[cfg(any(feature = "mock", test))]
+impl SessionsMock {
+    pub fn mock_post_handshake(session_id: u32) -> SessionsMock {
+        use crate::peer::mock_peers;
+        use nym_kkt::ciphersuite::{DecapsulationKey, EncapsulationKey};
+
+        let (init, resp) = mock_peers();
+        let resp_remote = resp.as_remote();
+        let init_remote = init.as_remote();
+        let salt = [42u8; 32];
+        let session_id_bytes = session_id.to_le_bytes();
+
+        // skip KKT by just deriving the kem key locally
+        let kem_keys = resp.kem_psq.as_ref().unwrap();
+
+        let libcrux_private_key = libcrux_kem::PrivateKey::decode(
+            libcrux_kem::Algorithm::X25519,
+            kem_keys.private_key().as_bytes(),
+        )
+        .unwrap();
+        let decapsulation_key = DecapsulationKey::X25519(libcrux_private_key);
+
+        let libcrux_public_key = libcrux_kem::PublicKey::decode(
+            libcrux_kem::Algorithm::X25519,
+            kem_keys.public_key().as_bytes(),
+        )
+        .unwrap();
+        let encapsulation_key = EncapsulationKey::X25519(libcrux_public_key);
+
+        // INIT -> RESP: PSQ MSG1
+        let psq_initiator = crate::psk::psq_initiator_create_message(
+            init.x25519.private_key(),
+            &resp_remote.x25519_public,
+            &encapsulation_key,
+            init.ed25519.private_key(),
+            init.ed25519.public_key(),
+            &salt,
+            &session_id_bytes,
+        )
+        .unwrap();
+
+        let psk = psq_initiator.psk;
+        let psq_payload = psq_initiator.payload;
+        let outer_aead_key = crate::codec::OuterAeadKey::from_psk(&psk);
+
+        let noise_state_init = snow::Builder::new(crate::noise_protocol::NoiseProtocol::params())
+            .local_private_key(init.x25519().private_key().as_bytes())
+            .remote_public_key(resp_remote.x25519_public.as_bytes())
+            .psk(crate::NOISE_PSK_INDEX, &psk)
+            .build_initiator()
+            .unwrap();
+        let mut noise_protocol_init = crate::noise_protocol::NoiseProtocol::new(noise_state_init);
+        let noise_msg1 = noise_protocol_init.get_bytes_to_send().unwrap().unwrap();
+
+        let psq_responder = crate::psk::psq_responder_process_message(
+            resp.x25519.private_key(),
+            &init_remote.x25519_public,
+            (&decapsulation_key, &encapsulation_key),
+            &init_remote.ed25519_public,
+            &psq_payload,
+            &salt,
+            &session_id_bytes,
+        )
+        .unwrap();
+
+        let noise_state_resp = snow::Builder::new(crate::noise_protocol::NoiseProtocol::params())
+            .local_private_key(resp.x25519().private_key().as_bytes())
+            .remote_public_key(init_remote.x25519_public.as_bytes())
+            .psk(crate::NOISE_PSK_INDEX, &psk)
+            .build_responder()
+            .unwrap();
+        let mut noise_protocol_resp = crate::noise_protocol::NoiseProtocol::new(noise_state_resp);
+        noise_protocol_resp.read_message(&noise_msg1).unwrap();
+
+        let noise_msg2 = noise_protocol_resp.get_bytes_to_send().unwrap().unwrap();
+        noise_protocol_init.read_message(&noise_msg2).unwrap();
+        let noise_msg3 = noise_protocol_init.get_bytes_to_send().unwrap().unwrap();
+
+        assert!(noise_protocol_init.is_handshake_finished());
+
+        noise_protocol_resp.read_message(&noise_msg3).unwrap();
+        assert!(noise_protocol_resp.is_handshake_finished());
+
+        SessionsMock {
+            initiator: LpSession::new(
+                session_id,
+                1,
+                outer_aead_key.clone(),
+                init,
+                resp_remote,
+                crate::session::PqSharedSecret::new(psq_initiator.pq_shared_secret),
+                noise_protocol_init,
+            ),
+            responder: LpSession::new(
+                session_id,
+                1,
+                outer_aead_key,
+                resp,
+                init_remote,
+                crate::session::PqSharedSecret::new(psq_responder.pq_shared_secret),
+                noise_protocol_resp,
+            ),
+        }
+    }
+
+    // we just need a dummy 'valid' session for simpler tests
+    pub fn mock_initiator() -> LpSession {
+        Self::mock_post_handshake(1234).initiator
+    }
+}
+
+#[cfg(any(feature = "mock", test))]
 pub fn sessions_for_tests() -> (LpSession, LpSession) {
-    use nym_crypto::asymmetric::{ed25519, x25519};
-    use std::sync::Arc;
+    let sessions = SessionsMock::mock_post_handshake(69);
+    (sessions.initiator, sessions.responder)
+}
 
-    let mut rng = rand::thread_rng();
-
-    // X25519 keypairs for Noise protocol
-    let keypair_1 = Arc::new(x25519::KeyPair::new(&mut rng));
-    let keypair_2 = Arc::new(x25519::KeyPair::new(&mut rng));
-
-    // Use a fixed receiver_index for deterministic tests
-    let receiver_index: u32 = 12345;
-
-    // Ed25519 keypairs for PSQ authentication (placeholders for testing)
-    let ed25519_keypair_1 = ed25519::KeyPair::from_secret([1u8; 32], 0);
-    let ed25519_keypair_2 = ed25519::KeyPair::from_secret([2u8; 32], 1);
-
-    let ed25519_keypair1_pubkey = *ed25519_keypair_1.public_key();
-
-    // Use consistent salt for deterministic tests
-    let salt = [1u8; 32];
-
-    // PSQ will always derive the PSK during handshake using X25519 as DHKEM
-
-    let initiator_session = LpSession::new(
-        receiver_index,
-        true,
-        Arc::new(ed25519_keypair_1),
-        keypair_1.clone(),
-        ed25519_keypair_2.public_key(),
-        keypair_2.public_key(),
-        &salt,
-    )
-    .expect("Test session creation failed");
-
-    let responder_session = LpSession::new(
-        receiver_index,
-        false,
-        Arc::new(ed25519_keypair_2),
-        keypair_2.clone(),
-        &ed25519_keypair1_pubkey,
-        keypair_1.public_key(),
-        &salt,
-    )
-    .expect("Test session creation failed");
-
-    (initiator_session, responder_session)
+#[cfg(any(feature = "mock", test))]
+pub fn mock_session_for_test() -> LpSession {
+    SessionsMock::mock_initiator()
 }
 
 #[cfg(test)]
@@ -82,9 +162,8 @@ mod tests {
     use crate::message::LpMessage;
     use crate::packet::{LpHeader, LpPacket, TRAILER_LEN};
     use crate::session_manager::SessionManager;
-    use crate::{LpError, sessions_for_tests};
+    use crate::{LpError, SessionsMock, mock_session_for_test};
     use bytes::BytesMut;
-    use std::sync::Arc;
 
     // Import the new standalone functions
     use crate::codec::{parse_lp_packet, serialize_lp_packet};
@@ -92,7 +171,7 @@ mod tests {
     #[test]
     fn test_replay_protection_integration() {
         // Create session
-        let session = sessions_for_tests().0;
+        let mut session = mock_session_for_test();
 
         // === Packet 1 (Counter 0 - Should succeed) ===
         let packet1 = LpPacket {
@@ -190,48 +269,21 @@ mod tests {
 
     #[test]
     fn test_session_manager_integration() {
-        use nym_crypto::asymmetric::ed25519;
-
         // Create session manager
-        let local_manager = SessionManager::new();
-        let remote_manager = SessionManager::new();
-
-        // Generate Ed25519 keypairs for PSQ authentication
-        let ed25519_keypair_local = ed25519::KeyPair::from_secret([8u8; 32], 0);
-        let ed25519_keypair_remote = ed25519::KeyPair::from_secret([9u8; 32], 1);
-
-        let ed25519_keypair_local_pubkey = *ed25519_keypair_local.public_key();
-        let x25519_keypair_local_pubkey = ed25519_keypair_local_pubkey.to_x25519().unwrap();
-        let x25519_keypair_remote_pubkey = ed25519_keypair_remote.public_key().to_x25519().unwrap();
+        let mut local_manager = SessionManager::new();
+        let mut remote_manager = SessionManager::new();
 
         // Use fixed receiver_index for deterministic test
         let receiver_index: u32 = 54321;
 
-        // Test salt
-        let salt = [46u8; 32];
+        let sessions = SessionsMock::mock_post_handshake(receiver_index);
+        let local_session = sessions.initiator;
+        let remote_session = sessions.responder;
 
         // Create a session via manager
-        let _ = local_manager
-            .create_session_state_machine(
-                receiver_index,
-                Arc::new(ed25519_keypair_local),
-                ed25519_keypair_remote.public_key(),
-                &x25519_keypair_remote_pubkey,
-                true,
-                &salt,
-            )
-            .unwrap();
+        let _ = local_manager.create_session_state_machine(local_session);
+        let _ = remote_manager.create_session_state_machine(remote_session);
 
-        let _ = remote_manager
-            .create_session_state_machine(
-                receiver_index,
-                Arc::new(ed25519_keypair_remote),
-                &ed25519_keypair_local_pubkey,
-                &x25519_keypair_local_pubkey,
-                false,
-                &salt,
-            )
-            .unwrap();
         // === Packet 1 (Counter 0 - Should succeed) ===
         let packet1 = LpPacket {
             header: LpHeader {

common/nym-lp/src/message.rs

@@ -1,16 +1,19 @@
 // Copyright 2025 - Nym Technologies SA <contact@nymtech.net>
 // SPDX-License-Identifier: Apache-2.0
 
-use crate::{BOOTSTRAP_RECEIVER_IDX, LpError};
+use crate::packet::LpHeader;
+use crate::peer::LpRemotePeer;
+use crate::{BOOTSTRAP_RECEIVER_IDX, LpError, LpPacket};
 use bytes::{BufMut, BytesMut};
 use num_enum::{IntoPrimitive, TryFromPrimitive};
 use nym_crypto::asymmetric::{ed25519, x25519};
 use rand::RngCore;
 use serde::{Deserialize, Serialize};
 use std::fmt::{self, Display};
+use std::net::{IpAddr, Ipv4Addr, Ipv6Addr, SocketAddr};
 
 /// Data structure for the ClientHello message
-#[derive(Debug, Clone, Serialize, Deserialize)]
+#[derive(Debug, Clone, Copy, Serialize, Deserialize, PartialEq)]
 pub struct ClientHelloData {
     /// Client-proposed receiver index for session identification (4 bytes)
     /// Auto-generated randomly by the client
@@ -27,6 +30,17 @@ impl ClientHelloData {
     // 4 bytes for receiver index + 32 bytes for client lp key, 32 bytes for client ed25519 key + 32 bytes for salt
     pub const LEN: usize = 100;
 
+    pub fn into_lp_packet(self, protocol_version: u8) -> LpPacket {
+        LpPacket::new(
+            LpHeader::new(
+                BOOTSTRAP_RECEIVER_IDX, // session_id not yet established
+                0,                      // counter starts at 0
+                protocol_version,
+            ),
+            LpMessage::ClientHello(self),
+        )
+    }
+
     fn len(&self) -> usize {
         Self::LEN
     }
@@ -109,6 +123,11 @@ impl ClientHelloData {
             salt: b[68..].try_into().unwrap(),
         })
     }
+
+    /// Attempt to construct remote peer information based on the data provided in this packet.
+    pub fn to_remote_peer(&self) -> LpRemotePeer {
+        LpRemotePeer::new(self.client_ed25519_public_key, self.client_lp_public_key)
+    }
 }
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq, IntoPrimitive, TryFromPrimitive)]
@@ -135,6 +154,8 @@ pub enum MessageType {
     SubsessionReady = 0x000C,
     /// Subsession abort - race winner tells loser to become responder
     SubsessionAbort = 0x000D,
+    /// General error
+    Error = 0x00FF,
 }
 
 impl MessageType {
@@ -151,6 +172,9 @@ impl MessageType {
 pub struct HandshakeData(pub Vec<u8>);
 
 impl HandshakeData {
+    pub(crate) fn new(bytes: Vec<u8>) -> Self {
+        Self(bytes)
+    }
     fn len(&self) -> usize {
         self.0.len()
     }
@@ -168,6 +192,11 @@ impl HandshakeData {
 pub struct EncryptedDataPayload(pub Vec<u8>);
 
 impl EncryptedDataPayload {
+    #[allow(dead_code)]
+    pub(crate) fn new(bytes: Vec<u8>) -> Self {
+        Self(bytes)
+    }
+
     fn len(&self) -> usize {
         self.0.len()
     }
@@ -186,6 +215,10 @@ impl EncryptedDataPayload {
 pub struct KKTRequestData(pub Vec<u8>);
 
 impl KKTRequestData {
+    pub(crate) fn new(bytes: Vec<u8>) -> Self {
+        Self(bytes)
+    }
+
     fn len(&self) -> usize {
         self.0.len()
     }
@@ -204,6 +237,10 @@ impl KKTRequestData {
 pub struct KKTResponseData(pub Vec<u8>);
 
 impl KKTResponseData {
+    pub(crate) fn new(bytes: Vec<u8>) -> Self {
+        Self(bytes)
+    }
+
     fn len(&self) -> usize {
         self.0.len()
     }
@@ -217,15 +254,60 @@ impl KKTResponseData {
     }
 }
 
+/// General human-readable error message
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct ErrorPacketData {
+    pub message: String,
+}
+
+impl ErrorPacketData {
+    pub(crate) fn new(message: impl Into<String>) -> Self {
+        ErrorPacketData {
+            message: message.into(),
+        }
+    }
+
+    fn len(&self) -> usize {
+        // length-encoding + message
+        4 + self.message.len()
+    }
+
+    fn encode(&self, dst: &mut BytesMut) {
+        dst.put_u32_le(self.message.len() as u32);
+        dst.put_slice(self.message.as_bytes());
+    }
+
+    fn decode(bytes: &[u8]) -> Result<Self, LpError> {
+        if bytes.len() < 4 {
+            return Err(LpError::DeserializationError(format!(
+                "Too few bytes to deserialise ErrorPacketData. got {}",
+                bytes.len()
+            )));
+        }
+
+        let message_len = u32::from_le_bytes([bytes[0], bytes[1], bytes[2], bytes[3]]) as usize;
+        if bytes[4..].len() != message_len {
+            return Err(LpError::DeserializationError(format!(
+                "Wrong number of bytes to deserialise ErrorPacketData. got {}. Expected {}",
+                bytes.len(),
+                4 + message_len
+            )));
+        }
+
+        let message = String::from_utf8_lossy(&bytes[4..]).to_string();
+
+        Ok(ErrorPacketData { message })
+    }
+}
+
 /// Packet forwarding request with embedded inner LP packet
 #[derive(Debug, Clone)]
 pub struct ForwardPacketData {
     /// Target gateway's Ed25519 identity (32 bytes)
     pub target_gateway_identity: [u8; 32],
 
-    // TODO: replace it with `SocketAddr`
     /// Target gateway's LP address (IP:port string)
-    pub target_lp_address: String,
+    pub target_lp_address: SocketAddr,
 
     /// Complete inner LP packet bytes (serialized LpPacket)
     /// This is the CLIENT→EXIT gateway packet, encrypted for exit
@@ -233,23 +315,46 @@ pub struct ForwardPacketData {
 }
 
 impl ForwardPacketData {
+    pub fn new(
+        target_gateway_identity: ed25519::PublicKey,
+        target_lp_address: SocketAddr,
+        inner_packet_bytes: Vec<u8>,
+    ) -> Self {
+        ForwardPacketData {
+            target_gateway_identity: target_gateway_identity.to_bytes(),
+            target_lp_address,
+            inner_packet_bytes,
+        }
+    }
+
     fn len(&self) -> usize {
         // 32 bytes target gateway identity
         // +
-        // 4 bytes length of target lp address
+        // 1 byte length of target lp address type
         // +
-        // target_lp_address.len()
+        // {4,16} target_lp_address IPv{4,6}
+        // +
+        // 2 bytes target_lp_address port
         // +
         // 4 bytes of length of inner packet bytes
         // +
         // inner_packet_bytes.len()
-        32 + 4 + self.target_lp_address.len() + 4 + self.inner_packet_bytes.len()
+        match self.target_lp_address {
+            SocketAddr::V4(_) => 32 + 1 + 4 + 2 + 4 + self.inner_packet_bytes.len(),
+            SocketAddr::V6(_) => 32 + 1 + 16 + 2 + 4 + self.inner_packet_bytes.len(),
+        }
     }
 
     fn encode(&self, dst: &mut BytesMut) {
+        let (is_ipv6, ip_bytes) = match &self.target_lp_address {
+            SocketAddr::V4(address) => (false, address.ip().octets().to_vec()),
+            SocketAddr::V6(address) => (true, address.ip().octets().to_vec()),
+        };
+
         dst.put_slice(&self.target_gateway_identity);
-        dst.put_u16_le(self.target_lp_address.len() as u16);
-        dst.put_slice(self.target_lp_address.as_bytes());
+        dst.put_u8(is_ipv6 as u8); // IP type , 0 for ipv4
+        dst.put_slice(&ip_bytes); // IP bytes
+        dst.put_u16_le(self.target_lp_address.port()); // Port
         dst.put_u32_le(self.inner_packet_bytes.len() as u32);
         dst.put_slice(&self.inner_packet_bytes);
     }
@@ -261,42 +366,56 @@ impl ForwardPacketData {
     }
 
     pub fn decode(bytes: &[u8]) -> Result<Self, LpError> {
-        // smallest possible packet with empty address and empty data
-        if bytes.len() < 38 {
+        // smallest possible packet with ipv4 and empty data
+        if bytes.len() < 43 {
+            // 32 + 1 + 4 + 2 + 4 + 0
             return Err(LpError::DeserializationError(format!(
-                "Too few bytes to deserialise ForwardPacketData[1]. got {}",
+                "Too few bytes to deserialise ForwardPacketData. got {}",
                 bytes.len()
             )));
         }
         // SAFETY: we ensured we have sufficient data
         #[allow(clippy::unwrap_used)]
         let target_gateway_identity = bytes[0..32].try_into().unwrap();
-        let target_lp_address_len = u16::from_le_bytes([bytes[32], bytes[33]]);
+        let target_lp_address_is_ipv6 = bytes[32] != 0;
 
-        // smallest possible packet with empty data
-        if bytes[34..].len() < 4 + target_lp_address_len as usize {
-            return Err(LpError::DeserializationError(format!(
-                "Too few bytes to deserialise ForwardPacketData[2]. got {}",
-                bytes.len()
-            )));
-        }
+        let (target_lp_address, next_index) = if target_lp_address_is_ipv6 {
+            // IPv6, first check we have actually enough bytes
+            // smallest possible packet with ipv6 and empty data
+            if bytes.len() < 55 {
+                // 32 + 1 + 16 + 2 + 4 + 0
+                return Err(LpError::DeserializationError(format!(
+                    "Too few bytes to deserialise ipv6 ForwardPacketData. got {}",
+                    bytes.len()
+                )));
+            }
+            // SAFETY: we ensured we have sufficient data, and the length is correct for casting
+            #[allow(clippy::unwrap_used)]
+            let ipv6 = IpAddr::V6(Ipv6Addr::from_octets(bytes[33..49].try_into().unwrap()));
+            let port = u16::from_le_bytes([bytes[49], bytes[50]]);
+            (SocketAddr::new(ipv6, port), 51)
+        } else {
+            // IPv4. Length check done at the start
+            // SAFETY: we ensured we have sufficient data, and the length is correct for casting
+            #[allow(clippy::unwrap_used)]
+            let ipv4 = IpAddr::V4(Ipv4Addr::from_octets(bytes[33..37].try_into().unwrap()));
+            let port = u16::from_le_bytes([bytes[37], bytes[38]]);
+            (SocketAddr::new(ipv4, port), 39)
+        };
 
-        let target_lp_address =
-            String::from_utf8_lossy(&bytes[34..34 + target_lp_address_len as usize]).to_string();
         let inner_packet_bytes_len = u32::from_le_bytes([
-            bytes[34 + target_lp_address_len as usize],
-            bytes[34 + target_lp_address_len as usize + 1],
-            bytes[34 + target_lp_address_len as usize + 2],
-            bytes[34 + target_lp_address_len as usize + 3],
+            bytes[next_index],
+            bytes[next_index + 1],
+            bytes[next_index + 2],
+            bytes[next_index + 3],
         ]);
-        if bytes[34 + target_lp_address_len as usize + 4..].len() != inner_packet_bytes_len as usize
-        {
+        if bytes[next_index + 4..].len() != inner_packet_bytes_len as usize {
             return Err(LpError::DeserializationError(format!(
                 "Expected {inner_packet_bytes_len} bytes to deserialise inner packet bytes of ForwardPacketData. got {}",
-                bytes[34 + target_lp_address_len as usize + 4..].len()
+                bytes[next_index + 4..].len()
             )));
         }
-        let inner_packet_bytes = bytes[34 + target_lp_address_len as usize + 4..].to_vec();
+        let inner_packet_bytes = bytes[next_index + 4..].to_vec();
 
         Ok(ForwardPacketData {
             target_gateway_identity,
@@ -406,6 +525,62 @@ pub enum LpMessage {
     SubsessionReady(SubsessionReadyData),
     /// Subsession abort - race winner tells loser to become responder (empty, signal only)
     SubsessionAbort,
+    /// An error has occurred
+    Error(ErrorPacketData),
+}
+
+impl From<HandshakeData> for LpMessage {
+    fn from(value: HandshakeData) -> Self {
+        LpMessage::Handshake(value)
+    }
+}
+
+impl From<EncryptedDataPayload> for LpMessage {
+    fn from(value: EncryptedDataPayload) -> Self {
+        LpMessage::EncryptedData(value)
+    }
+}
+
+impl From<ClientHelloData> for LpMessage {
+    fn from(value: ClientHelloData) -> Self {
+        LpMessage::ClientHello(value)
+    }
+}
+
+impl From<KKTRequestData> for LpMessage {
+    fn from(value: KKTRequestData) -> Self {
+        LpMessage::KKTRequest(value)
+    }
+}
+
+impl From<KKTResponseData> for LpMessage {
+    fn from(value: KKTResponseData) -> Self {
+        LpMessage::KKTResponse(value)
+    }
+}
+
+impl From<ForwardPacketData> for LpMessage {
+    fn from(value: ForwardPacketData) -> Self {
+        LpMessage::ForwardPacket(value)
+    }
+}
+
+impl From<SubsessionKK1Data> for LpMessage {
+    fn from(value: SubsessionKK1Data) -> Self {
+        LpMessage::SubsessionKK1(value)
+    }
+}
+
+impl From<SubsessionKK2Data> for LpMessage {
+    fn from(value: SubsessionKK2Data) -> Self {
+        LpMessage::SubsessionKK2(value)
+    }
+}
+
+impl From<SubsessionReadyData> for LpMessage {
+    fn from(value: SubsessionReadyData) -> Self {
+        LpMessage::SubsessionReady(value)
+    }
 }
 
 impl Display for LpMessage {
@@ -425,6 +600,7 @@ impl Display for LpMessage {
             LpMessage::SubsessionKK2(_) => write!(f, "SubsessionKK2"),
             LpMessage::SubsessionReady(_) => write!(f, "SubsessionReady"),
             LpMessage::SubsessionAbort => write!(f, "SubsessionAbort"),
+            LpMessage::Error(_) => write!(f, "Error"),
         }
     }
 }
@@ -446,6 +622,7 @@ impl LpMessage {
             LpMessage::SubsessionKK2(_) => &[], // Structured data, serialized in encode_content
             LpMessage::SubsessionReady(_) => &[], // Structured data, serialized in encode_content
             LpMessage::SubsessionAbort => &[],
+            LpMessage::Error(_) => &[], // Structured data, serialized in encode_content (?)
         }
     }
 
@@ -465,6 +642,7 @@ impl LpMessage {
             LpMessage::SubsessionKK2(_) => false, // Always has payload
             LpMessage::SubsessionReady(_) => false, // Always has receiver_index
             LpMessage::SubsessionAbort => true,   // Empty signal
+            LpMessage::Error(_) => false,
         }
     }
 
@@ -484,6 +662,7 @@ impl LpMessage {
             LpMessage::SubsessionKK2(payload) => payload.len(),
             LpMessage::SubsessionReady(payload) => payload.len(),
             LpMessage::SubsessionAbort => 0,
+            LpMessage::Error(payload) => payload.len(),
         }
     }
 
@@ -503,6 +682,7 @@ impl LpMessage {
             LpMessage::SubsessionKK2(_) => MessageType::SubsessionKK2,
             LpMessage::SubsessionReady(_) => MessageType::SubsessionReady,
             LpMessage::SubsessionAbort => MessageType::SubsessionAbort,
+            LpMessage::Error(_) => MessageType::Error,
         }
     }
 
@@ -522,6 +702,7 @@ impl LpMessage {
             LpMessage::SubsessionKK2(data) => data.encode(dst),
             LpMessage::SubsessionReady(data) => data.encode(dst),
             LpMessage::SubsessionAbort => { /* No content - signal only */ }
+            LpMessage::Error(data) => data.encode(dst),
         }
     }
 
@@ -574,6 +755,7 @@ impl LpMessage {
                 content.ensure_empty()?;
                 Ok(LpMessage::SubsessionAbort)
             }
+            MessageType::Error => Ok(LpMessage::Error(ErrorPacketData::decode(content)?)),
         }
     }
 }

common/nym-lp/src/noise_protocol.rs

@@ -82,6 +82,13 @@ pub enum ReadResult {
 // --- Implementation ---
 
 impl NoiseProtocol {
+    pub fn params() -> NoiseParams {
+        // SAFETY: the hardcoded pattern must be valid
+        // and if for some reason it was not, we MUST fail non-gracefully for there is no possible recovery
+        #[allow(clippy::unwrap_used)]
+        crate::NOISE_PATTERN.parse().unwrap()
+    }
+
     /// Creates a new `NoiseProtocol` instance in the Handshaking state.
     ///
     /// Takes an initialized `snow::HandshakeState` (e.g., from `snow::Builder`).
@@ -91,6 +98,46 @@ impl NoiseProtocol {
         }
     }
 
+    fn prepare_handshake_state<'a>(
+        local_private_key: &'a [u8],
+        remote_public_key: &'a [u8],
+        psk: &'a [u8],
+    ) -> snow::Builder<'a> {
+        let psk_index = crate::NOISE_PSK_INDEX;
+        let noise_params = NoiseProtocol::params();
+
+        snow::Builder::new(noise_params)
+            .local_private_key(local_private_key)
+            .remote_public_key(remote_public_key)
+            .psk(psk_index, psk)
+    }
+
+    /// Builds a new `NoiseProtocol` initiator instance with the provided local private key,
+    /// remote public key and psk
+    pub fn build_new_initiator(
+        local_private_key: &[u8],
+        remote_public_key: &[u8],
+        psk: &[u8],
+    ) -> Result<Self, NoiseError> {
+        let handshake_state =
+            Self::prepare_handshake_state(local_private_key, remote_public_key, psk)
+                .build_initiator()?;
+        Ok(Self::new(handshake_state))
+    }
+
+    /// Builds a new `NoiseProtocol` responder instance with the provided local private key,
+    /// remote public key and psk
+    pub fn build_new_responder(
+        local_private_key: &[u8],
+        remote_public_key: &[u8],
+        psk: &[u8],
+    ) -> Result<Self, NoiseError> {
+        let handshake_state =
+            Self::prepare_handshake_state(local_private_key, remote_public_key, psk)
+                .build_responder()?;
+        Ok(Self::new(handshake_state))
+    }
+
     /// Processes a single, complete incoming Noise message frame.
     ///
     /// Assumes the caller handles buffering and framing to provide one full message.
@@ -288,43 +335,3 @@ impl NoiseProtocol {
         }
     }
 }
-
-pub fn create_noise_state(
-    local_private_key: &[u8],
-    remote_public_key: &[u8],
-    psk: &[u8],
-) -> Result<NoiseProtocol, NoiseError> {
-    let pattern_name = crate::NOISE_PATTERN;
-    let psk_index = crate::NOISE_PSK_INDEX;
-    let noise_params: NoiseParams = pattern_name.parse().unwrap();
-
-    let builder = snow::Builder::new(noise_params.clone());
-    // Using dummy remote key as it's not needed for state creation itself
-    // In a real scenario, the key would depend on initiator/responder role
-    let handshake_state = builder
-        .local_private_key(local_private_key)
-        .remote_public_key(remote_public_key) // Use own public as dummy remote
-        .psk(psk_index, psk)
-        .build_initiator()?;
-    Ok(NoiseProtocol::new(handshake_state))
-}
-
-pub fn create_noise_state_responder(
-    local_private_key: &[u8],
-    remote_public_key: &[u8],
-    psk: &[u8],
-) -> Result<NoiseProtocol, NoiseError> {
-    let pattern_name = crate::NOISE_PATTERN;
-    let psk_index = crate::NOISE_PSK_INDEX;
-    let noise_params: NoiseParams = pattern_name.parse().unwrap();
-
-    let builder = snow::Builder::new(noise_params.clone());
-    // Using dummy remote key as it's not needed for state creation itself
-    // In a real scenario, the key would depend on initiator/responder role
-    let handshake_state = builder
-        .local_private_key(local_private_key)
-        .remote_public_key(remote_public_key) // Use own public as dummy remote
-        .psk(psk_index, psk)
-        .build_responder()?;
-    Ok(NoiseProtocol::new(handshake_state))
-}

common/nym-lp/src/packet.rs

@@ -2,7 +2,7 @@
 // SPDX-License-Identifier: Apache-2.0
 
 use crate::LpError;
-use crate::message::LpMessage;
+use crate::message::{LpMessage, MessageType};
 use crate::replay::ReceivingKeyCounterValidator;
 use bytes::{BufMut, BytesMut};
 use nym_lp_common::format_debug_bytes;
@@ -53,6 +53,10 @@ impl LpPacket {
         }
     }
 
+    pub fn typ(&self) -> MessageType {
+        self.message.typ()
+    }
+
     /// Compute a hash of the message payload
     ///
     /// This can be used for message integrity verification or deduplication
@@ -203,9 +207,9 @@ impl LpHeader {
 }
 
 impl LpHeader {
-    pub fn new(receiver_idx: u32, counter: u64) -> Self {
+    pub fn new(receiver_idx: u32, counter: u64, protocol_version: u8) -> Self {
         Self {
-            protocol_version: version::CURRENT,
+            protocol_version,
             reserved: [0u8; 3],
             receiver_idx,
             counter,
@@ -265,7 +269,7 @@ impl LpHeader {
 
         Ok(LpHeader {
             protocol_version,
-            reserved: [0u8; 3],
+            reserved,
             receiver_idx,
             counter,
         })

common/nym-lp/src/peer.rs

@@ -0,0 +1,197 @@
+// Copyright 2026 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use crate::{ClientHelloData, LpError};
+use nym_crypto::asymmetric::{ed25519, x25519};
+use nym_kkt::ciphersuite::{Ciphersuite, KEM, KEMKeyDigests, SignatureScheme, SigningKeyDigests};
+use std::collections::HashMap;
+use std::sync::Arc;
+
+/// Representation of a local Lewes Protocol peer
+/// encapsulating all the known information and keys.
+#[derive(Debug, Clone)]
+pub struct LpLocalPeer {
+    /// Local Ed25519 keys for PSQ authentication
+    pub(crate) ed25519: Arc<ed25519::KeyPair>,
+
+    /// Local x25519 keys (Noise static key)
+    pub(crate) x25519: Arc<x25519::KeyPair>,
+
+    /// Local KEM key used for PSQ
+    pub(crate) kem_psq: Option<Arc<x25519::KeyPair>>,
+}
+
+impl LpLocalPeer {
+    pub fn new(ed25519: Arc<ed25519::KeyPair>, x25519: Arc<x25519::KeyPair>) -> Self {
+        LpLocalPeer {
+            ed25519,
+            x25519,
+            kem_psq: None,
+        }
+    }
+
+    pub fn build_client_hello_data(&self, timestamp: u64) -> ClientHelloData {
+        ClientHelloData::new_with_fresh_salt(
+            *self.x25519().public_key(),
+            *self.ed25519().public_key(),
+            timestamp,
+        )
+    }
+
+    #[must_use]
+    pub fn with_kem_psq_key(mut self, key: Arc<x25519::KeyPair>) -> Self {
+        self.kem_psq = Some(key);
+        self
+    }
+
+    pub fn ed25519(&self) -> &Arc<ed25519::KeyPair> {
+        &self.ed25519
+    }
+
+    pub fn x25519(&self) -> &Arc<x25519::KeyPair> {
+        &self.x25519
+    }
+
+    /// Returns the reference to the KEM Public key of the peer (if available).
+    pub fn get_kem_key_handle(&self) -> Result<&x25519::PublicKey, LpError> {
+        self.kem_psq
+            .as_ref()
+            .map(|kp| kp.public_key())
+            .ok_or(LpError::ResponderWithMissingKEMKey)
+    }
+
+    /// Convert this `LpLocalPeer` into a valid `LpRemotePeer` that can be used within tests
+    #[doc(hidden)]
+    pub fn as_remote(&self) -> LpRemotePeer {
+        let expected_kem_key_digests = match &self.kem_psq {
+            None => HashMap::new(),
+            Some(kem_keys) => {
+                let mut digests = HashMap::new();
+                digests.insert(
+                    KEM::X25519,
+                    nym_kkt::key_utils::produce_key_digests(kem_keys.public_key().as_bytes()),
+                );
+                digests
+            }
+        };
+
+        let mut expected_signing_key_digests = HashMap::new();
+        expected_signing_key_digests.insert(
+            SignatureScheme::Ed25519,
+            nym_kkt::key_utils::produce_key_digests(self.ed25519.public_key().as_bytes()),
+        );
+
+        LpRemotePeer {
+            ed25519_public: *self.ed25519.public_key(),
+            x25519_public: *self.x25519.public_key(),
+            expected_kem_key_digests,
+            expected_signing_key_digests,
+        }
+    }
+
+    // this is only exposed in tests as ideally we should be storing the proper types to begin with
+    #[cfg(test)]
+    pub fn encapsulate_kem_key(&self) -> Option<nym_kkt::ciphersuite::EncapsulationKey<'_>> {
+        let pk_bytes = self.kem_psq.as_ref()?.public_key().to_bytes();
+        let libcrux_pk =
+            libcrux_kem::PublicKey::decode(libcrux_kem::Algorithm::X25519, &pk_bytes).ok()?;
+
+        Some(nym_kkt::ciphersuite::EncapsulationKey::X25519(libcrux_pk))
+    }
+}
+
+/// Representation of a remote Lewes Protocol peer
+/// encapsulating all the known information and keys.
+#[derive(Debug, Clone)]
+pub struct LpRemotePeer {
+    /// Remote Ed25519 public key for PSQ authentication
+    pub(crate) ed25519_public: ed25519::PublicKey,
+
+    /// Remote X25519 public key (Noise static key)
+    pub(crate) x25519_public: x25519::PublicKey,
+
+    /// Expected digests of the remote's KEM key
+    pub(crate) expected_kem_key_digests: HashMap<KEM, KEMKeyDigests>,
+
+    /// Expected digests of the remote's signing key
+    pub(crate) expected_signing_key_digests: HashMap<SignatureScheme, SigningKeyDigests>,
+}
+
+impl LpRemotePeer {
+    pub fn new(ed25519_public: ed25519::PublicKey, x25519_public: x25519::PublicKey) -> Self {
+        LpRemotePeer {
+            ed25519_public,
+            x25519_public,
+            expected_kem_key_digests: Default::default(),
+            expected_signing_key_digests: Default::default(),
+        }
+    }
+
+    pub fn ed25519(&self) -> ed25519::PublicKey {
+        self.ed25519_public
+    }
+
+    pub fn x25519(&self) -> x25519::PublicKey {
+        self.x25519_public
+    }
+
+    #[must_use]
+    pub fn with_key_digests(
+        mut self,
+        expected_kem_key_digests: HashMap<KEM, KEMKeyDigests>,
+        expected_signing_key_digests: HashMap<SignatureScheme, SigningKeyDigests>,
+    ) -> Self {
+        self.expected_kem_key_digests = expected_kem_key_digests;
+        self.expected_signing_key_digests = expected_signing_key_digests;
+        self
+    }
+
+    /// Attempt to retrieve expected KEM key hash of the remote
+    /// for [`nym_kkt::ciphersuite::KEM`] key type and [`nym_kkt::ciphersuite::HashFunction`]
+    /// specified by own [`nym_kkt::ciphersuite::Ciphersuite`]
+    pub(crate) fn expected_kem_key_hash(
+        &self,
+        ciphersuite: Ciphersuite,
+    ) -> Result<Vec<u8>, LpError> {
+        let kem = ciphersuite.kem();
+        let hash_function = ciphersuite.hash_function();
+
+        let digests = self
+            .expected_kem_key_digests
+            .get(&kem)
+            .ok_or(LpError::NoKnownKEMKeyDigests { kem, hash_function })?;
+
+        digests
+            .get(&hash_function)
+            .ok_or(LpError::NoKnownKEMKeyDigests { kem, hash_function })
+            .cloned()
+    }
+}
+
+#[cfg(any(feature = "mock", test))]
+pub fn mock_peer() -> LpLocalPeer {
+    // use deterministic rng
+    let mut rng = nym_test_utils::helpers::deterministic_rng();
+    random_peer(&mut rng)
+}
+
+#[cfg(any(feature = "mock", test))]
+pub fn random_peer<R: rand::CryptoRng + rand::RngCore>(rng: &mut R) -> LpLocalPeer {
+    let ed25519 = Arc::new(ed25519::KeyPair::new(rng));
+    let x25519 = Arc::new(ed25519.to_x25519());
+    let kem_psq = Some(x25519.clone());
+
+    LpLocalPeer {
+        ed25519,
+        x25519,
+        kem_psq,
+    }
+}
+
+#[cfg(any(feature = "mock", test))]
+pub fn mock_peers() -> (LpLocalPeer, LpLocalPeer) {
+    // use deterministic rng
+    let mut rng = nym_test_utils::helpers::deterministic_rng();
+
+    (random_peer(&mut rng), random_peer(&mut rng))
+}

common/nym-lp/src/psq/helpers.rs

@@ -0,0 +1,52 @@
+// Copyright 2026 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use crate::codec::{OuterAeadKey, parse_lp_packet, serialize_lp_packet};
+use crate::{LpError, LpPacket};
+use bytes::BytesMut;
+use nym_lp_transport::traits::LpTransport;
+
+#[cfg(test)]
+use mock_instant::thread_local::{SystemTime, UNIX_EPOCH};
+#[cfg(not(test))]
+use std::time::{SystemTime, UNIX_EPOCH};
+
+pub(crate) fn current_timestamp() -> Result<u64, LpError> {
+    SystemTime::now()
+        .duration_since(UNIX_EPOCH)
+        .map_err(|_| LpError::Internal("System time before UNIX epoch".into()))
+        .map(|d| d.as_secs())
+}
+
+// only used in internal code (and tests)
+#[allow(async_fn_in_trait)]
+pub trait LpTransportHandshakeExt: LpTransport {
+    // the outer key is temporary until the algorithm is changed with psqv2
+    async fn receive_packet(
+        &mut self,
+        outer_key: Option<&OuterAeadKey>,
+    ) -> Result<LpPacket, LpError>
+    where
+        Self: Unpin,
+    {
+        let raw = self.receive_raw_packet().await?;
+        parse_lp_packet(&raw, outer_key)
+    }
+
+    async fn send_packet(
+        &mut self,
+        packet: LpPacket,
+        outer_key: Option<&OuterAeadKey>,
+    ) -> Result<(), LpError>
+    where
+        Self: Unpin,
+    {
+        let mut packet_buf = BytesMut::new();
+
+        serialize_lp_packet(&packet, &mut packet_buf, outer_key)?;
+        self.send_serialised_packet(&packet_buf).await?;
+        Ok(())
+    }
+}
+
+impl<T> LpTransportHandshakeExt for T where T: LpTransport {}

common/nym-lp/src/psq/initiator.rs

@@ -0,0 +1,391 @@
+// Copyright 2026 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use crate::codec::OuterAeadKey;
+use crate::message::{HandshakeData, KKTRequestData, MessageType};
+use crate::noise_protocol::NoiseProtocol;
+use crate::peer::LpRemotePeer;
+use crate::psk::psq_initiator_create_message;
+use crate::psq::helpers::{LpTransportHandshakeExt, current_timestamp};
+use crate::psq::{IntermediateHandshakeFailure, PSQHandshakeState};
+use crate::session::PqSharedSecret;
+use crate::{ClientHelloData, LpError, LpMessage, LpSession};
+use nym_kkt::KKT_RESPONSE_AAD;
+use nym_kkt::ciphersuite::EncapsulationKey;
+use nym_kkt::context::KKTContext;
+use nym_kkt::encryption::{KKTSessionSecret, decrypt_kkt_frame, encrypt_initial_kkt_frame};
+use nym_kkt::session::{anonymous_initiator_process, initiator_ingest_response};
+use nym_lp_transport::traits::LpTransport;
+use rand09::rng;
+use tracing::debug;
+
+impl<'a, S> PSQHandshakeState<'a, S>
+where
+    S: LpTransport + Unpin,
+{
+    /// Generate and send client hello to the responder
+    pub(crate) async fn send_client_hello(&mut self) -> Result<ClientHelloData, LpError> {
+        let protocol = self.protocol_version()?;
+
+        // 1. Generate and send ClientHelloData with fresh salt and both public keys
+        let timestamp = current_timestamp()?;
+
+        let client_hello_data = self.local_peer.build_client_hello_data(timestamp);
+        self.connection
+            .send_packet(client_hello_data.into_lp_packet(protocol), None)
+            .await?;
+        Ok(client_hello_data)
+    }
+
+    /// Attempt to receive an ack to sent client hello. returns a boolean indicating
+    /// whether the request has been successful or whether there has been a collision in receiver
+    /// index requiring a retry
+    pub(crate) async fn receive_client_hello_ack(&mut self) -> Result<bool, LpError> {
+        match self.receive_non_error(None).await?.message {
+            LpMessage::Ack => Ok(true),
+            LpMessage::Collision => Ok(false),
+            other => {
+                // TODO: retry on collision
+                Err(LpError::unexpected_handshake_response(
+                    other.typ(),
+                    MessageType::Ack,
+                ))
+            }
+        }
+    }
+
+    /// Attempt to send KKT request to begin the handshake
+    pub(crate) async fn send_kkt_request(
+        &mut self,
+        session_id: u32,
+        remote_peer: &LpRemotePeer,
+    ) -> Result<(KKTContext, KKTSessionSecret), LpError> {
+        let protocol = self.protocol_version()?;
+
+        let (kkt_context, kkt_frame) = anonymous_initiator_process(&mut rng(), self.ciphersuite)?;
+        let (session_secret, encrypted_frame) =
+            encrypt_initial_kkt_frame(&mut rng(), &remote_peer.x25519_public, &kkt_frame)?;
+        let lp_message = KKTRequestData::new(encrypted_frame).into();
+        let lp_packet = self.next_packet(session_id, protocol, lp_message);
+        self.connection.send_packet(lp_packet, None).await?;
+        Ok((kkt_context, session_secret))
+    }
+
+    /// Attempt to receive a KKT response to the previously sent request and extract (and validate)
+    /// the received encapsulation key
+    pub(crate) async fn receive_kkt_response(
+        &mut self,
+        (kkt_context, session_secret): (KKTContext, KKTSessionSecret),
+        remote_peer: &LpRemotePeer,
+    ) -> Result<EncapsulationKey<'static>, LpError> {
+        let kkt_response = match self.receive_non_error(None).await?.message {
+            LpMessage::KKTResponse(response) => response,
+            other => {
+                return Err(LpError::unexpected_handshake_response(
+                    other.typ(),
+                    MessageType::KKTResponse,
+                ));
+            }
+        };
+        debug!("received KKT response");
+        let expected_kem_key_digest = remote_peer.expected_kem_key_hash(self.ciphersuite)?;
+
+        let (response_frame, remote_context) =
+            decrypt_kkt_frame(&session_secret, &kkt_response.0, KKT_RESPONSE_AAD)?;
+        let encapsulation_key = initiator_ingest_response(
+            &kkt_context,
+            &response_frame,
+            &remote_context,
+            &remote_peer.ed25519_public,
+            &expected_kem_key_digest,
+        )?;
+        Ok(encapsulation_key)
+    }
+
+    /// Attempt to prepare and send initial PSQ msg1
+    pub(crate) async fn send_psq_initiator_message(
+        &mut self,
+        remote_peer: &LpRemotePeer,
+        encapsulation_key: &EncapsulationKey<'_>,
+        salt: &[u8; 32],
+        session_id_bytes: &[u8; 4],
+    ) -> Result<(OuterAeadKey, NoiseProtocol, PqSharedSecret), LpError> {
+        let protocol = self.protocol_version()?;
+        let session_id = u32::from_le_bytes(*session_id_bytes);
+
+        let psq_initiator = psq_initiator_create_message(
+            self.local_peer.x25519.private_key(),
+            &remote_peer.x25519_public,
+            encapsulation_key,
+            self.local_peer.ed25519.private_key(),
+            self.local_peer.ed25519.public_key(),
+            salt,
+            session_id_bytes,
+        )?;
+        let psk = psq_initiator.psk;
+        let psq_payload = psq_initiator.payload;
+
+        // TEMP \/
+        let outer_aead_key = OuterAeadKey::from_psk(&psk);
+        // TEMP /\
+
+        // prepare noise state and msg1
+        let mut noise_protocol = NoiseProtocol::build_new_initiator(
+            self.local_peer.x25519().private_key().as_bytes(),
+            remote_peer.x25519_public.as_bytes(),
+            &psk,
+        )?;
+
+        // prepare noise msg1
+        let noise_msg1 = noise_protocol
+            .get_bytes_to_send()
+            .ok_or_else(|| LpError::kkt_psq_handshake("failed to generate noise msg1"))??;
+        let psq_len = psq_payload.len() as u16;
+        let mut combined = Vec::with_capacity(2 + psq_payload.len() + noise_msg1.len());
+        combined.extend_from_slice(&psq_len.to_le_bytes());
+        combined.extend_from_slice(&psq_payload);
+        combined.extend_from_slice(&noise_msg1);
+
+        let lp_message = HandshakeData::new(combined).into();
+        let lp_packet = self.next_packet(session_id, protocol, lp_message);
+
+        self.connection.send_packet(lp_packet, None).await?;
+        Ok((
+            outer_aead_key,
+            noise_protocol,
+            PqSharedSecret::new(psq_initiator.pq_shared_secret),
+        ))
+    }
+
+    /// Attempt to receive and validate received PSQ msg2
+    pub(crate) async fn receive_psq_responder_message(
+        &mut self,
+        outer_aead_key: &OuterAeadKey,
+        noise_protocol: &mut NoiseProtocol,
+    ) -> Result<(), LpError> {
+        let psq_msg2 = match self
+            .connection
+            .receive_packet(Some(outer_aead_key))
+            .await?
+            .message
+        {
+            LpMessage::Handshake(response) => response.0,
+            other => {
+                return Err(LpError::unexpected_handshake_response(
+                    other.typ(),
+                    MessageType::Handshake,
+                ));
+            }
+        };
+
+        // Extract PSK handle: [u16 handle_len][handle_bytes][noise_msg]
+        if psq_msg2.len() < 2 {
+            return Err(LpError::kkt_psq_handshake("too short msg2 received"));
+        }
+        let handle_len = u16::from_le_bytes([psq_msg2[0], psq_msg2[1]]) as usize;
+        if psq_msg2.len() < 2 + handle_len {
+            return Err(LpError::kkt_psq_handshake("too short msg2 received"));
+        }
+        // Extract and "store" the PSK handle
+        let _psq_handle_bytes = &psq_msg2[2..2 + handle_len];
+        let noise_payload = &psq_msg2[2 + handle_len..];
+
+        // *sigh* ignore the message
+        let _noise_msg2 = noise_protocol.read_message(noise_payload)?;
+        Ok(())
+    }
+
+    /// Attempt to prepare and send final PSQ msg3
+    pub(crate) async fn send_final_psq_message(
+        &mut self,
+        session_id: u32,
+        outer_aead_key: &OuterAeadKey,
+        noise_protocol: &mut NoiseProtocol,
+    ) -> Result<(), LpError> {
+        let protocol = self.protocol_version()?;
+
+        let noise_msg3 = noise_protocol
+            .get_bytes_to_send()
+            .ok_or_else(|| LpError::kkt_psq_handshake("failed to generate noise msg3"))??;
+
+        let lp_message = HandshakeData::new(noise_msg3).into();
+        let lp_packet = self.next_packet(session_id, protocol, lp_message);
+        self.connection
+            .send_packet(lp_packet, Some(outer_aead_key))
+            .await?;
+
+        if !noise_protocol.is_handshake_finished() {
+            return Err(LpError::kkt_psq_handshake(
+                "noise handshake not finished after msg3",
+            ));
+        }
+
+        Ok(())
+    }
+
+    /// Receive final ACK that indicates finalisation of the handshake
+    pub(crate) async fn receive_final_ack(
+        &mut self,
+        outer_aead_key: &OuterAeadKey,
+    ) -> Result<(), LpError> {
+        match self
+            .connection
+            .receive_packet(Some(outer_aead_key))
+            .await?
+            .message
+        {
+            LpMessage::Ack => Ok(()),
+            other => Err(LpError::unexpected_handshake_response(
+                other.typ(),
+                MessageType::Ack,
+            )),
+        }
+    }
+
+    async fn complete_as_initiator_inner(
+        &mut self,
+    ) -> Result<LpSession, IntermediateHandshakeFailure>
+    where
+        S: LpTransport + Unpin,
+    {
+        // 0. retrieve the expected kem key hash. if we don't know it,
+        // there's no point in even trying to start the handshake
+        let Some(remote_peer) = self.remote_peer.take() else {
+            return Err(IntermediateHandshakeFailure::plain(
+                LpError::kkt_psq_handshake("initiator can't proceed without remote information"),
+            ));
+        };
+
+        // 1. Generate and send ClientHelloData with fresh salt and both public keys
+        // and keep retrying until we manage to establish a receiver index without collisions
+        let mut attempt = 0;
+        let client_hello_data = loop {
+            attempt += 1;
+
+            debug!("sending client hello");
+            let client_hello = self
+                .send_client_hello()
+                .await
+                .map_err(IntermediateHandshakeFailure::plain)?;
+            if self
+                .receive_client_hello_ack()
+                .await
+                .map_err(IntermediateHandshakeFailure::plain)?
+            {
+                debug!("received client hello ACK");
+                break client_hello;
+            }
+            debug!("received client hello collision");
+
+            // TODO: make it configurable
+            if attempt > 3 {
+                return Err(IntermediateHandshakeFailure::plain(
+                    LpError::kkt_psq_handshake(
+                        "failed to establish receiver index without collision",
+                    ),
+                ));
+            }
+        };
+        let session_id = client_hello_data.receiver_index;
+        let session_id_bytes = session_id.to_le_bytes();
+        let salt = client_hello_data.salt;
+
+        // 3. prepare and send KKT request
+        debug!("sending KKT request");
+        let kkt_data = self
+            .send_kkt_request(session_id, &remote_peer)
+            .await
+            .map_err(|source| IntermediateHandshakeFailure {
+                session_id: Some(session_id),
+                protocol_version: self.protocol_version,
+                outer_aead_key: None,
+                source,
+            })?;
+
+        // 4. receive and process KKT response
+        let encapsulation_key = self
+            .receive_kkt_response(kkt_data, &remote_peer)
+            .await
+            .map_err(|source| IntermediateHandshakeFailure {
+                session_id: Some(session_id),
+                protocol_version: self.protocol_version,
+                outer_aead_key: None,
+                source,
+            })?;
+        debug!("received KKT response");
+
+        // 5. prepare and send PSQ msg1
+        debug!("sending PSQ msg1");
+        let (outer_aead_key, mut noise_protocol, pq_shared_secret) = self
+            .send_psq_initiator_message(&remote_peer, &encapsulation_key, &salt, &session_id_bytes)
+            .await
+            .map_err(|source| IntermediateHandshakeFailure {
+                session_id: Some(session_id),
+                protocol_version: self.protocol_version,
+                outer_aead_key: None,
+                source,
+            })?;
+
+        // 6. receive and process PSQ msg2
+        debug!("received PSQ msg2");
+        if let Err(source) = self
+            .receive_psq_responder_message(&outer_aead_key, &mut noise_protocol)
+            .await
+        {
+            return Err(IntermediateHandshakeFailure {
+                session_id: Some(session_id),
+                protocol_version: self.protocol_version,
+                outer_aead_key: Some(outer_aead_key),
+                source,
+            });
+        }
+
+        // 7. prepare and send PSQ msg3
+        debug!("sending PSQ msg3");
+        if let Err(source) = self
+            .send_final_psq_message(session_id, &outer_aead_key, &mut noise_protocol)
+            .await
+        {
+            return Err(IntermediateHandshakeFailure {
+                session_id: Some(session_id),
+                protocol_version: self.protocol_version,
+                outer_aead_key: Some(outer_aead_key),
+                source,
+            });
+        }
+
+        // 8. receive final ACK and finalise
+        debug!("received final ACK");
+        if let Err(source) = self.receive_final_ack(&outer_aead_key).await {
+            return Err(IntermediateHandshakeFailure {
+                session_id: Some(session_id),
+                protocol_version: self.protocol_version,
+                outer_aead_key: Some(outer_aead_key),
+                source,
+            });
+        }
+
+        #[allow(clippy::expect_used)]
+        Ok(LpSession::new(
+            session_id,
+            self.protocol_version()
+                .expect("protocol version is known at this point"),
+            outer_aead_key,
+            self.local_peer.clone(),
+            remote_peer,
+            pq_shared_secret,
+            noise_protocol,
+        ))
+    }
+
+    // TODO: missing: receive counter check
+    pub async fn complete_as_initiator(mut self) -> Result<LpSession, LpError>
+    where
+        S: LpTransport + Unpin,
+    {
+        match self.complete_as_initiator_inner().await {
+            Ok(res) => Ok(res),
+            Err(err) => Err(self.try_send_error_packet(err).await),
+        }
+    }
+}

common/nym-lp/src/psq/mod.rs

@@ -0,0 +1,340 @@
+// Copyright 2026 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use crate::codec::OuterAeadKey;
+use crate::message::ErrorPacketData;
+use crate::packet::LpHeader;
+use crate::peer::{LpLocalPeer, LpRemotePeer};
+use crate::psq::helpers::LpTransportHandshakeExt;
+use crate::{LpError, LpMessage, LpPacket};
+use nym_kkt::ciphersuite::Ciphersuite;
+use nym_lp_transport::traits::LpTransport;
+use tracing::debug;
+
+mod helpers;
+mod initiator;
+mod responder;
+
+pub(crate) struct IntermediateHandshakeFailure {
+    /// Session id established during exchange if we managed to derive it
+    session_id: Option<u32>,
+
+    /// Protocol version established during the exchange
+    protocol_version: Option<u8>,
+
+    /// Outer aead key established during exchange if we managed to derive it
+    outer_aead_key: Option<OuterAeadKey>,
+
+    /// The error source
+    source: LpError,
+}
+
+impl IntermediateHandshakeFailure {
+    fn plain(source: LpError) -> IntermediateHandshakeFailure {
+        IntermediateHandshakeFailure {
+            session_id: None,
+            protocol_version: None,
+            outer_aead_key: None,
+            source,
+        }
+    }
+}
+
+pub struct PSQHandshakeState<'a, S> {
+    /// The underlying connection established for the handshake
+    connection: &'a mut S,
+
+    /// Protocol version used for the exchange.
+    /// either known implicitly through the directory (initiator)
+    /// or established through client hello (responder)
+    protocol_version: Option<u8>,
+
+    /// Ciphersuite selected for the KKT/PSQ exchange
+    ciphersuite: Ciphersuite,
+
+    /// Representation of a local Lewes Protocol peer
+    /// encapsulating all the known information and keys.
+    local_peer: LpLocalPeer,
+
+    /// Representation of a remote Lewes Protocol peer
+    /// encapsulating all the known information and keys.
+    remote_peer: Option<LpRemotePeer>,
+
+    /// Counter for outgoing packets
+    sending_counter: u64,
+}
+
+impl<'a, S> PSQHandshakeState<'a, S>
+where
+    S: LpTransport + Unpin,
+{
+    pub fn new(connection: &'a mut S, ciphersuite: Ciphersuite, local_peer: LpLocalPeer) -> Self {
+        PSQHandshakeState {
+            connection,
+            protocol_version: None,
+            ciphersuite,
+            local_peer,
+            remote_peer: None,
+            sending_counter: 0,
+        }
+    }
+
+    #[must_use]
+    pub fn with_protocol_version(mut self, protocol_version: u8) -> Self {
+        self.protocol_version = Some(protocol_version);
+        self
+    }
+
+    #[must_use]
+    pub fn with_remote_peer(mut self, remote_peer: LpRemotePeer) -> Self {
+        self.remote_peer = Some(remote_peer);
+        self
+    }
+
+    fn protocol_version(&self) -> Result<u8, LpError> {
+        self.protocol_version
+            .ok_or_else(|| LpError::kkt_psq_handshake("unknown protocol version"))
+    }
+
+    /// Generates the next counter value for outgoing packets.
+    pub fn next_counter(&mut self) -> u64 {
+        let counter = self.sending_counter;
+        self.sending_counter += 1;
+        counter
+    }
+
+    pub fn next_packet(
+        &mut self,
+        session_id: u32,
+        protocol_version: u8,
+        message: LpMessage,
+    ) -> LpPacket {
+        let counter = self.next_counter();
+        let header = LpHeader::new(session_id, counter, protocol_version);
+        LpPacket::new(header, message)
+    }
+
+    pub(crate) async fn try_send_error_packet(
+        &mut self,
+        err: IntermediateHandshakeFailure,
+    ) -> LpError {
+        // if session_id is not known, we can't send the packet back (with the current design)
+        let (Some(session_id), Some(protocol)) = (err.session_id, err.protocol_version) else {
+            return err.source;
+        };
+        if let Err(err) = self
+            .send_error_packet(
+                session_id,
+                protocol,
+                err.source.to_string(),
+                err.outer_aead_key.as_ref(),
+            )
+            .await
+        {
+            debug!("failed to send back error response: {err}")
+        }
+        err.source
+    }
+
+    /// Attempt to send an error packet
+    pub(crate) async fn send_error_packet(
+        &mut self,
+        session_id: u32,
+        protocol_version: u8,
+        msg: impl Into<String>,
+        outer_aead_key: Option<&OuterAeadKey>,
+    ) -> Result<(), LpError> {
+        let packet = self.next_packet(
+            session_id,
+            protocol_version,
+            LpMessage::Error(ErrorPacketData::new(msg)),
+        );
+        self.connection.send_packet(packet, outer_aead_key).await?;
+        Ok(())
+    }
+
+    /// Attempt to receive a packet from connection, explicitly checking for an error response
+    /// and returning corresponding message if received
+    pub(crate) async fn receive_non_error(
+        &mut self,
+        outer_aead_key: Option<&OuterAeadKey>,
+    ) -> Result<LpPacket, LpError> {
+        let packet = self.connection.receive_packet(outer_aead_key).await?;
+
+        match &packet.message {
+            LpMessage::Error(error_packet) => Err(LpError::kkt_psq_handshake(format!(
+                "remote error: {}",
+                error_packet.message
+            ))),
+            _ => Ok(packet),
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::peer::mock_peers;
+    use crate::psq::helpers::LpTransportHandshakeExt;
+    use crate::psq::responder::DEFAULT_TIMESTAMP_TOLERANCE;
+    use mock_instant::thread_local::MockClock;
+    use nym_kkt::ciphersuite::{HashFunction, HashLength, KEM, SignatureScheme};
+    use nym_test_utils::mocks::async_read_write::MockIOStream;
+    use nym_test_utils::traits::{Leak, TimeboxedSpawnable};
+    use std::time::Duration;
+    use tokio::join;
+
+    #[allow(dead_code)]
+    async fn extract_error(conn: &mut MockIOStream) -> String {
+        let packet = conn.receive_packet(None).await.unwrap();
+        match packet.message {
+            LpMessage::Error(error) => error.message,
+            _ => panic!("non error packet"),
+        }
+    }
+
+    #[tokio::test]
+    async fn e2e_psq_handshake() -> anyhow::Result<()> {
+        let conn_init = MockIOStream::default();
+        let conn_resp = conn_init.try_get_remote_handle();
+
+        // leak the connections (JUST FOR THE PURPOSE OF THIS TEST!)
+        // so they'd get 'static lifetime
+        let conn_init = conn_init.leak();
+        let conn_resp = conn_resp.leak();
+
+        let ciphersuite = Ciphersuite::new(
+            KEM::X25519,
+            HashFunction::Blake3,
+            SignatureScheme::Ed25519,
+            HashLength::Default,
+        );
+
+        let (init, resp) = mock_peers();
+        let resp_remote = resp.as_remote();
+
+        let handshake_init = PSQHandshakeState::new(conn_init, ciphersuite, init)
+            .with_protocol_version(1)
+            .with_remote_peer(resp_remote);
+        let handshake_resp = PSQHandshakeState::new(conn_resp, ciphersuite, resp);
+
+        let resp_fut = handshake_resp.complete_as_responder().spawn_timeboxed();
+        let init_fut = handshake_init.complete_as_initiator().spawn_timeboxed();
+
+        let (session_init, session_resp) = join!(init_fut, resp_fut);
+
+        let session_init = session_init???;
+        let session_resp = session_resp???;
+
+        assert_eq!(session_init.id(), session_resp.id());
+        assert_eq!(
+            session_init.outer_aead_key().as_bytes(),
+            session_resp.outer_aead_key().as_bytes()
+        );
+        assert_eq!(
+            session_init.pq_shared_secret().as_bytes(),
+            session_resp.pq_shared_secret().as_bytes()
+        );
+
+        Ok(())
+    }
+
+    #[tokio::test]
+    async fn preparing_client_hello_initiator() -> anyhow::Result<()> {
+        let mut conn_init = MockIOStream::default();
+        let mut conn_resp = conn_init.try_get_remote_handle();
+
+        let ciphersuite = Ciphersuite::new(
+            KEM::X25519,
+            HashFunction::Blake3,
+            SignatureScheme::Ed25519,
+            HashLength::Default,
+        );
+        let (init, resp) = mock_peers();
+        let resp_remote = resp.as_remote();
+
+        // as initiator
+        let mut handshake_init = PSQHandshakeState::new(&mut conn_init, ciphersuite, init)
+            .with_protocol_version(1)
+            .with_remote_peer(resp_remote);
+
+        // you can generate and send (valid) client hello as initiator
+        let client_hello = handshake_init.send_client_hello().await?;
+        let LpMessage::ClientHello(received_client_hello) =
+            conn_resp.receive_packet(None).await?.message
+        else {
+            panic!("wrong message type");
+        };
+        assert_eq!(client_hello, received_client_hello);
+        Ok(())
+    }
+
+    // essentially make sure you can't accidentally trigger the handshake as the responder
+    #[tokio::test]
+    async fn preparing_client_hello_responder() -> anyhow::Result<()> {
+        let conn_init = MockIOStream::default();
+        let mut conn_resp = conn_init.try_get_remote_handle();
+
+        let ciphersuite = Ciphersuite::new(
+            KEM::X25519,
+            HashFunction::Blake3,
+            SignatureScheme::Ed25519,
+            HashLength::Default,
+        );
+        let (_, resp) = mock_peers();
+
+        // as initiator
+        let mut handshake_resp = PSQHandshakeState::new(&mut conn_resp, ciphersuite, resp);
+
+        // you can generate and send (valid) client hello as initiator
+        let sending_res = handshake_resp.send_client_hello().await;
+        assert!(sending_res.is_err());
+        Ok(())
+    }
+
+    #[tokio::test]
+    async fn test_receive_client_hello_timestamp_too_skewed() -> anyhow::Result<()> {
+        let current_time = Duration::from_secs(10000);
+        MockClock::set_system_time(current_time);
+
+        let too_old = current_time - DEFAULT_TIMESTAMP_TOLERANCE - Duration::from_secs(1);
+        let too_recent = current_time + DEFAULT_TIMESTAMP_TOLERANCE + Duration::from_secs(1);
+
+        let ciphersuite = Ciphersuite::new(
+            KEM::X25519,
+            HashFunction::Blake3,
+            SignatureScheme::Ed25519,
+            HashLength::Default,
+        );
+
+        // TOO OLD
+        let mut conn_init = MockIOStream::default();
+        let mut conn_resp = conn_init.try_get_remote_handle();
+        let (init, resp) = mock_peers();
+
+        let mut handshake_resp = PSQHandshakeState::new(&mut conn_resp, ciphersuite, resp);
+        let client_hello_too_old = init.build_client_hello_data(too_old.as_secs());
+
+        conn_init
+            .send_packet(client_hello_too_old.into_lp_packet(1), None)
+            .await?;
+        let err = handshake_resp.receive_client_hello().await.unwrap_err();
+        assert!(err.to_string().contains("too old"));
+
+        // TOO RECENT
+        let mut conn_init = MockIOStream::default();
+        let mut conn_resp = conn_init.try_get_remote_handle();
+        let (init, resp) = mock_peers();
+
+        let mut handshake_resp = PSQHandshakeState::new(&mut conn_resp, ciphersuite, resp);
+        let client_hello_too_recent = init.build_client_hello_data(too_recent.as_secs());
+
+        conn_init
+            .send_packet(client_hello_too_recent.into_lp_packet(1), None)
+            .await?;
+        let err = handshake_resp.receive_client_hello().await.unwrap_err();
+
+        assert!(err.to_string().contains("too future"));
+        Ok(())
+    }
+}

common/nym-lp/src/psq/responder.rs

@@ -0,0 +1,461 @@
+// Copyright 2026 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use crate::codec::OuterAeadKey;
+use crate::message::{HandshakeData, KKTResponseData, MessageType};
+use crate::noise_protocol::NoiseProtocol;
+use crate::peer::LpRemotePeer;
+use crate::psk::psq_responder_process_message;
+use crate::psq::helpers::{LpTransportHandshakeExt, current_timestamp};
+use crate::psq::{IntermediateHandshakeFailure, PSQHandshakeState};
+use crate::session::PqSharedSecret;
+use crate::{ClientHelloData, LpError, LpMessage, LpSession};
+use nym_kkt::KKT_RESPONSE_AAD;
+use nym_kkt::ciphersuite::{DecapsulationKey, EncapsulationKey};
+use nym_kkt::context::KKTContext;
+use nym_kkt::encryption::{KKTSessionSecret, decrypt_initial_kkt_frame, encrypt_kkt_frame};
+use nym_kkt::frame::KKTSessionId;
+use nym_kkt::session::{responder_ingest_message, responder_process};
+use nym_lp_transport::traits::LpTransport;
+use rand09::rng;
+use std::time::Duration;
+use tracing::debug;
+
+pub const DEFAULT_TIMESTAMP_TOLERANCE: Duration = Duration::from_secs(30);
+
+// this will be removed anyway, so no point in doing anything more than a hardcoded placeholder
+fn validate_client_hello_timestamp(
+    client_timestamp: u64,
+    tolerance: Duration,
+) -> Result<(), LpError> {
+    let now = current_timestamp()?;
+
+    let age = now.abs_diff(client_timestamp);
+    if age > tolerance.as_secs() {
+        let direction = if now >= client_timestamp {
+            "old"
+        } else {
+            "future"
+        };
+
+        return Err(LpError::kkt_psq_handshake(format!(
+            "ClientHello timestamp is too {direction} (age: {age}s, tolerance: {}s)",
+            tolerance.as_secs()
+        )));
+    }
+
+    Ok(())
+}
+
+impl<'a, S> PSQHandshakeState<'a, S>
+where
+    S: LpTransport + Unpin,
+{
+    pub(crate) fn encapsulated_kem_keys(
+        &self,
+    ) -> Result<(DecapsulationKey<'static>, EncapsulationKey<'static>), LpError> {
+        let kem_keys = self
+            .local_peer
+            .kem_psq
+            .as_ref()
+            .ok_or(LpError::ResponderWithMissingKEMKey)?;
+
+        let libcrux_private_key = libcrux_kem::PrivateKey::decode(
+            libcrux_kem::Algorithm::X25519,
+            kem_keys.private_key().as_bytes(),
+        )
+        .map_err(|e| {
+            LpError::KKTError(format!(
+                "Failed to convert X25519 private key to libcrux PrivateKey: {e:?}",
+            ))
+        })?;
+        let dec_key = DecapsulationKey::X25519(libcrux_private_key);
+
+        let libcrux_public_key = libcrux_kem::PublicKey::decode(
+            libcrux_kem::Algorithm::X25519,
+            kem_keys.public_key().as_bytes(),
+        )
+        .map_err(|e| {
+            LpError::KKTError(format!(
+                "Failed to convert X25519 public key to libcrux PublicKey: {e:?}",
+            ))
+        })?;
+        let enc_key = EncapsulationKey::X25519(libcrux_public_key);
+        Ok((dec_key, enc_key))
+    }
+
+    /// Attempt to receive and validate ClientHello
+    pub(crate) async fn receive_client_hello(
+        &mut self,
+    ) -> Result<(ClientHelloData, LpRemotePeer), LpError> {
+        let client_hello_packet = self.receive_non_error(None).await?;
+        let client_hello = match client_hello_packet.message {
+            LpMessage::ClientHello(client_hello) => client_hello,
+            other => {
+                return Err(LpError::unexpected_handshake_response(
+                    other.typ(),
+                    MessageType::ClientHello,
+                ));
+            }
+        };
+
+        validate_client_hello_timestamp(
+            client_hello.extract_timestamp(),
+            DEFAULT_TIMESTAMP_TOLERANCE,
+        )?;
+
+        // TODO: somehow check for collision
+
+        // set version and remote peer information
+        self.protocol_version = Some(client_hello_packet.header.protocol_version);
+        let remote_peer = LpRemotePeer::new(
+            client_hello.client_ed25519_public_key,
+            client_hello.client_lp_public_key,
+        );
+
+        Ok((client_hello, remote_peer))
+    }
+
+    /// Send client hello ACK
+    pub(crate) async fn send_client_hello_ack(&mut self, session_id: u32) -> Result<(), LpError> {
+        let protocol = self.protocol_version()?;
+
+        let ack = self.next_packet(session_id, protocol, LpMessage::Ack);
+        self.connection.send_packet(ack, None).await?;
+        Ok(())
+    }
+
+    /// Attempt to receive and process a KKT request
+    pub(crate) async fn receive_kkt_request(
+        &mut self,
+    ) -> Result<(KKTContext, KKTSessionSecret, KKTSessionId), LpError> {
+        let kkt_request = match self.receive_non_error(None).await?.message {
+            LpMessage::KKTRequest(request) => request.0,
+            other => {
+                return Err(LpError::unexpected_handshake_response(
+                    other.typ(),
+                    MessageType::KKTRequest,
+                ));
+            }
+        };
+
+        let (session_secret, request_frame, remote_context) =
+            decrypt_initial_kkt_frame(self.local_peer.x25519.private_key(), &kkt_request)?;
+        let (context, _) = responder_ingest_message(&remote_context, None, None, &request_frame)?;
+
+        Ok((context, session_secret, request_frame.session_id()))
+    }
+
+    /// Attempt to send KKT response to the previously received request
+    pub(crate) async fn send_kkt_response(
+        &mut self,
+        session_id: u32,
+        (kkt_context, session_secret, kkt_session_id): (KKTContext, KKTSessionSecret, KKTSessionId),
+        encapsulation_key: &EncapsulationKey<'_>,
+    ) -> Result<(), LpError> {
+        let protocol = self.protocol_version()?;
+
+        let response_frame = responder_process(
+            &kkt_context,
+            kkt_session_id,
+            self.local_peer.ed25519().private_key(),
+            encapsulation_key,
+        )?;
+        let encrypted_frame = encrypt_kkt_frame(
+            &mut rng(),
+            &session_secret,
+            &response_frame,
+            KKT_RESPONSE_AAD,
+        )?;
+        let lp_message = KKTResponseData::new(encrypted_frame).into();
+        let lp_packet = self.next_packet(session_id, protocol, lp_message);
+
+        self.connection.send_packet(lp_packet, None).await?;
+        Ok(())
+    }
+
+    /// Attempt to receive and process a PSQ msg1 request
+    pub(crate) async fn receive_psq_initiator_message(
+        &mut self,
+        remote_peer: &LpRemotePeer,
+        local_kem_keypair: (&DecapsulationKey<'_>, &EncapsulationKey<'_>),
+        salt: &[u8; 32],
+        session_id_bytes: &[u8; 4],
+    ) -> Result<(OuterAeadKey, NoiseProtocol, PqSharedSecret, Vec<u8>), LpError> {
+        let psq_msg1 = match self.receive_non_error(None).await?.message {
+            LpMessage::Handshake(response) => response.0,
+            other => {
+                return Err(LpError::unexpected_handshake_response(
+                    other.typ(),
+                    MessageType::Handshake,
+                ));
+            }
+        };
+
+        // Extract PSQ payload: [u16 psq_len][psq_payload][noise_msg]
+        if psq_msg1.len() < 2 {
+            return Err(LpError::kkt_psq_handshake("too short msg1 received"));
+        }
+        let handle_len = u16::from_le_bytes([psq_msg1[0], psq_msg1[1]]) as usize;
+        if psq_msg1.len() < 2 + handle_len {
+            return Err(LpError::kkt_psq_handshake("too short msg1 received"));
+        }
+        let psq_payload = &psq_msg1[2..2 + handle_len];
+        let noise_payload = &psq_msg1[2 + handle_len..];
+
+        // Decapsulate PSK from PSQ payload using X25519 as DHKEM
+        let psq_responder = psq_responder_process_message(
+            self.local_peer.x25519.private_key(),
+            &remote_peer.x25519_public,
+            local_kem_keypair,
+            &remote_peer.ed25519_public,
+            psq_payload,
+            salt,
+            session_id_bytes,
+        )?;
+
+        let psk = psq_responder.psk;
+        let psk_handle = psq_responder.psk_handle;
+
+        // TEMP \/
+        let outer_aead_key = OuterAeadKey::from_psk(&psk);
+        // TEMP /\
+
+        let mut noise_protocol = NoiseProtocol::build_new_responder(
+            self.local_peer.x25519().private_key().as_bytes(),
+            remote_peer.x25519_public.as_bytes(),
+            &psk,
+        )?;
+        noise_protocol.read_message(noise_payload)?;
+
+        Ok((
+            outer_aead_key,
+            noise_protocol,
+            PqSharedSecret::new(psq_responder.pq_shared_secret),
+            psk_handle,
+        ))
+    }
+
+    /// Attempt to prepare and generate a responder PSQ msg2
+    pub(crate) async fn send_psq_responder_message(
+        &mut self,
+        session_id: u32,
+        psk_handle: &[u8],
+        outer_aead_key: &OuterAeadKey,
+        noise_protocol: &mut NoiseProtocol,
+    ) -> Result<(), LpError> {
+        let protocol = self.protocol_version()?;
+
+        let msg2 = noise_protocol
+            .get_bytes_to_send()
+            .ok_or_else(|| LpError::kkt_psq_handshake("failed to generate noise msg2"))??;
+        // Embed PSK handle in message: [u16 handle_len][handle_bytes][noise_msg]
+        let handle_len = psk_handle.len() as u16;
+        let mut combined = Vec::with_capacity(2 + psk_handle.len() + msg2.len());
+        combined.extend_from_slice(&handle_len.to_le_bytes());
+        combined.extend_from_slice(psk_handle);
+        combined.extend_from_slice(&msg2);
+
+        let lp_message = HandshakeData::new(combined).into();
+        let lp_packet = self.next_packet(session_id, protocol, lp_message);
+        self.connection
+            .send_packet(lp_packet, Some(outer_aead_key))
+            .await?;
+        Ok(())
+    }
+
+    /// Attempt to receive and process final PSQ msg3
+    pub(crate) async fn receive_final_psq_message(
+        &mut self,
+        outer_aead_key: &OuterAeadKey,
+        noise_protocol: &mut NoiseProtocol,
+    ) -> Result<(), LpError> {
+        let psq_msg3 = match self
+            .connection
+            .receive_packet(Some(outer_aead_key))
+            .await?
+            .message
+        {
+            LpMessage::Handshake(response) => response.0,
+            other => {
+                return Err(LpError::unexpected_handshake_response(
+                    other.typ(),
+                    MessageType::Handshake,
+                ));
+            }
+        };
+
+        noise_protocol.read_message(&psq_msg3)?;
+        if !noise_protocol.is_handshake_finished() {
+            return Err(LpError::kkt_psq_handshake(
+                "noise handshake not finished after msg3",
+            ));
+        }
+        Ok(())
+    }
+
+    /// Send final ACK to indicate finalisation of the handshake
+    pub(crate) async fn send_final_ack(
+        &mut self,
+        session_id: u32,
+        outer_aead_key: &OuterAeadKey,
+    ) -> Result<(), LpError> {
+        let protocol = self.protocol_version()?;
+
+        let ack = self.next_packet(session_id, protocol, LpMessage::Ack);
+        self.connection
+            .send_packet(ack, Some(outer_aead_key))
+            .await?;
+        Ok(())
+    }
+
+    async fn complete_as_responder_inner(
+        &mut self,
+    ) -> Result<LpSession, IntermediateHandshakeFailure>
+    where
+        S: LpTransport + Unpin,
+    {
+        // 1. receive and validate ClientHello
+        let (client_hello_data, remote_peer) =
+            self.receive_client_hello()
+                .await
+                .map_err(|source| IntermediateHandshakeFailure {
+                    session_id: None,
+                    protocol_version: self.protocol_version,
+                    outer_aead_key: None,
+                    source,
+                })?;
+        debug!("received client hello");
+
+        let session_id = client_hello_data.receiver_index;
+        let session_id_bytes = session_id.to_le_bytes();
+        let salt = client_hello_data.salt;
+
+        // 2. send ack
+        debug!("sending client hello ACK");
+        self.send_client_hello_ack(session_id)
+            .await
+            .map_err(|source| IntermediateHandshakeFailure {
+                session_id: Some(session_id),
+                protocol_version: self.protocol_version,
+                outer_aead_key: None,
+                source,
+            })?;
+
+        // 3. receive and process KKT request
+        let kkt_data =
+            self.receive_kkt_request()
+                .await
+                .map_err(|source| IntermediateHandshakeFailure {
+                    session_id: Some(session_id),
+                    protocol_version: self.protocol_version,
+                    outer_aead_key: None,
+                    source,
+                })?;
+        debug!("received KKT request");
+
+        // TEMP: 'derive' KEM keys
+        let (dec_key, enc_key) =
+            self.encapsulated_kem_keys()
+                .map_err(|source| IntermediateHandshakeFailure {
+                    session_id: Some(session_id),
+                    protocol_version: self.protocol_version,
+                    outer_aead_key: None,
+                    source,
+                })?;
+
+        // 4. prepare and send KKT response
+        debug!("sending KKT response");
+        self.send_kkt_response(session_id, kkt_data, &enc_key)
+            .await
+            .map_err(|source| IntermediateHandshakeFailure {
+                session_id: Some(session_id),
+                protocol_version: self.protocol_version,
+                outer_aead_key: None,
+                source,
+            })?;
+
+        // 5. receive and process PSQ msg1
+        debug!("received PSQ msg1");
+        let (outer_aead_key, mut noise_protocol, pq_shared_secret, psk_handle) = self
+            .receive_psq_initiator_message(
+                &remote_peer,
+                (&dec_key, &enc_key),
+                &salt,
+                &session_id_bytes,
+            )
+            .await
+            .map_err(|source| IntermediateHandshakeFailure {
+                session_id: Some(session_id),
+                protocol_version: self.protocol_version,
+                outer_aead_key: None,
+                source,
+            })?;
+
+        // 6. prepare and send PSQ msg2
+        debug!("sending PSQ msg2");
+        if let Err(source) = self
+            .send_psq_responder_message(
+                session_id,
+                &psk_handle,
+                &outer_aead_key,
+                &mut noise_protocol,
+            )
+            .await
+        {
+            return Err(IntermediateHandshakeFailure {
+                session_id: Some(session_id),
+                protocol_version: self.protocol_version,
+                outer_aead_key: Some(outer_aead_key),
+                source,
+            });
+        }
+
+        // 7. receive and process PSQ msg3
+        debug!("received PSQ msg3");
+        if let Err(source) = self
+            .receive_final_psq_message(&outer_aead_key, &mut noise_protocol)
+            .await
+        {
+            return Err(IntermediateHandshakeFailure {
+                session_id: Some(session_id),
+                protocol_version: self.protocol_version,
+                outer_aead_key: Some(outer_aead_key),
+                source,
+            });
+        }
+
+        // 8. [optionally] send ACK to finalise
+        debug!("sending final ACK");
+        if let Err(source) = self.send_final_ack(session_id, &outer_aead_key).await {
+            return Err(IntermediateHandshakeFailure {
+                session_id: Some(session_id),
+                protocol_version: self.protocol_version,
+                outer_aead_key: Some(outer_aead_key),
+                source,
+            });
+        }
+
+        #[allow(clippy::expect_used)]
+        Ok(LpSession::new(
+            session_id,
+            self.protocol_version()
+                .expect("protocol version is known at this point"),
+            outer_aead_key,
+            self.local_peer.clone(),
+            remote_peer,
+            pq_shared_secret,
+            noise_protocol,
+        ))
+    }
+
+    pub async fn complete_as_responder(mut self) -> Result<LpSession, LpError>
+    where
+        S: LpTransport + Unpin,
+    {
+        match self.complete_as_responder_inner().await {
+            Ok(res) => Ok(res),
+            Err(err) => Err(self.try_send_error_packet(err).await),
+        }
+    }
+}