Chore/additional helpers (#4585)

* exposed additional helpers

* changes lost in rebasing

common/cosmwasm-smart-contracts/coconut-dkg/src/types.rs

@@ -328,4 +328,8 @@ impl EpochState {
     pub fn is_dealing_exchange(&self) -> bool {
         matches!(self, EpochState::DealingExchange { .. })
     }
+
+    pub fn is_waiting_initialisation(&self) -> bool {
+        matches!(self, EpochState::WaitingInitialisation)
+    }
 }

common/credentials-interface/src/lib.rs

@@ -8,11 +8,11 @@ use std::str::FromStr;
 use thiserror::Error;
 
 pub use nym_coconut::{
-    aggregate_signature_shares_and_verify, aggregate_verification_keys, blind_sign, hash_to_scalar,
-    keygen, prepare_blind_sign, prove_bandwidth_credential, verify_credential, Attribute, Base58,
-    BlindSignRequest, BlindedSerialNumber, BlindedSignature, Bytable, CoconutError, KeyPair,
-    Parameters, PrivateAttribute, PublicAttribute, SecretKey, Signature, SignatureShare,
-    VerificationKey, VerifyCredentialRequest,
+    aggregate_signature_shares, aggregate_signature_shares_and_verify, aggregate_verification_keys,
+    blind_sign, hash_to_scalar, keygen, prepare_blind_sign, prove_bandwidth_credential,
+    verify_credential, Attribute, Base58, BlindSignRequest, BlindedSerialNumber, BlindedSignature,
+    Bytable, CoconutError, KeyPair, Parameters, PrivateAttribute, PublicAttribute, SecretKey,
+    Signature, SignatureShare, VerificationKey, VerifyCredentialRequest,
 };
 
 pub const VOUCHER_INFO_TYPE: &str = "BandwidthVoucher";

common/credentials/src/coconut/bandwidth/issuance.rs

@@ -10,9 +10,9 @@ use crate::coconut::bandwidth::{
 use crate::coconut::utils::scalar_serde_helper;
 use crate::error::Error;
 use nym_credentials_interface::{
-    aggregate_signature_shares_and_verify, hash_to_scalar, prepare_blind_sign, Attribute,
-    BlindedSerialNumber, BlindedSignature, Parameters, PrivateAttribute, PublicAttribute,
-    Signature, SignatureShare, VerificationKey,
+    aggregate_signature_shares, aggregate_signature_shares_and_verify, hash_to_scalar,
+    prepare_blind_sign, Attribute, BlindedSerialNumber, BlindedSignature, Parameters,
+    PrivateAttribute, PublicAttribute, Signature, SignatureShare, VerificationKey,
 };
 use nym_crypto::asymmetric::{encryption, identity};
 use nym_validator_client::nym_api::EpochId;
@@ -266,6 +266,13 @@ impl IssuanceBandwidthCredential {
         self.unblind_signature(validator_vk, &signing_data, blinded_signature)
     }
 
+    pub fn unchecked_aggregate_signature_shares(
+        &self,
+        shares: &[SignatureShare],
+    ) -> Result<Signature, Error> {
+        aggregate_signature_shares(shares).map_err(Error::SignatureAggregationError)
+    }
+
     pub fn aggregate_signature_shares(
         &self,
         verification_key: &VerificationKey,

common/credentials/src/coconut/bandwidth/voucher.rs

@@ -6,7 +6,7 @@ use crate::coconut::utils::scalar_serde_helper;
 use crate::error::Error;
 use nym_api_requests::coconut::BlindSignRequestBody;
 use nym_credentials_interface::{
-    hash_to_scalar, Attribute, BlindSignRequest, BlindedSignature, PublicAttribute,
+    hash_to_scalar, Attribute, BlindSignRequest, BlindedSignature, CredentialType, PublicAttribute,
 };
 use nym_crypto::asymmetric::{encryption, identity};
 use nym_validator_client::nyxd::{Coin, Hash};
@@ -123,6 +123,10 @@ impl BandwidthVoucherIssuanceData {
         &self.value_prehashed
     }
 
+    pub fn typ() -> CredentialType {
+        CredentialType::Voucher
+    }
+
     pub fn tx_hash(&self) -> Hash {
         self.deposit_tx_hash
     }

common/nymcoconut/src/scheme/issuance.rs

@@ -157,6 +157,10 @@ impl BlindSignRequest {
         )
     }
 
+    pub fn verify_commitment_hash(&self, public_attributes: &[&Attribute]) -> bool {
+        self.commitment_hash == compute_hash(self.commitment, public_attributes)
+    }
+
     pub fn get_commitment_hash(&self) -> G1Projective {
         self.commitment_hash
     }