public SignedEcCommitment GenerateDerivedCommitment(long pollId, SelectionCommitmentRequest request)
{
if (request is null)
{
throw new ArgumentNullException(nameof(request));
}
EcPollRecord poll = _dataAccessService.GetEcPoll(pollId);
byte[][] assetIds = poll.Candidates.Select(c => c.AssetId.HexStringToByteArray()).ToArray();
bool res1 = ConfidentialAssetsHelper.VerifySurjectionProof(request.CandidateCommitmentProofs, request.Commitment);
if (!res1)
{
throw new ArgumentException("Verification to candidate commitments failed");
}
foreach (var candidateCommitment in request.CandidateCommitments)
{
bool res2 = ConfidentialAssetsHelper.VerifyIssuanceSurjectionProof(candidateCommitment.IssuanceProof, candidateCommitment.Commitment, assetIds);
if (!res2)
{
throw new ArgumentException($"Verification of candidate's {candidateCommitment.Commitment.ToHexString()} issuance proof failed");
}
}
byte[] ecBlindingFactor = ConfidentialAssetsHelper.GetRandomSeed();
byte[] ecCommitment = ConfidentialAssetsHelper.BlindAssetCommitment(request.Commitment, ecBlindingFactor);
_dataAccessService.AddPollSelection(pollId, ecCommitment.ToHexString(), ecBlindingFactor.ToHexString());
var persistency = _executionContextManager.ResolveStateExecutionServices(poll.AccountId);
var signature = persistency.ClientCryptoService.Sign(ecCommitment);
return(new SignedEcCommitment
{
EcCommitment = ecCommitment,
Signature = signature
});
}