/// <summary>
/// Check if ``indexed_attestation`` has valid indices and signature.
/// </summary>
public bool IsValidIndexedAttestation(BeaconState state, IndexedAttestation indexedAttestation, Domain domain)
{
MiscellaneousParameters miscellaneousParameters = _miscellaneousParameterOptions.CurrentValue;
IReadOnlyList <ValidatorIndex> attestingIndices = indexedAttestation.AttestingIndices;
// Verify max number of indices
if ((ulong)attestingIndices.Count > miscellaneousParameters.MaximumValidatorsPerCommittee)
{
if (_logger.IsWarn())
{
Log.InvalidIndexedAttestationTooMany(_logger, indexedAttestation.Data.Index,
indexedAttestation.Data.Slot, attestingIndices.Count,
miscellaneousParameters.MaximumValidatorsPerCommittee, null);
}
return(false);
}
// Verify indices are sorted and unique
if (attestingIndices.Count() > 1)
{
for (int index = 0; index < attestingIndices.Count() - 1; index++)
{
if (!(attestingIndices[index] < attestingIndices[index + 1]))
{
if (attestingIndices[index] == attestingIndices[index + 1])
{
if (_logger.IsWarn())
{
Log.InvalidIndexedAttestationNotUnique(_logger, indexedAttestation.Data.Index,
indexedAttestation.Data.Slot, 0, index, null);
}
}
else
{
if (_logger.IsWarn())
{
Log.InvalidIndexedAttestationNotSorted(_logger, indexedAttestation.Data.Index,
indexedAttestation.Data.Slot, 0, index, null);
}
}
return(false);
}
}
}
// TODO: BLS FastAggregateVerify (see spec)
// Verify aggregate signature
IList <BlsPublicKey> publicKeys = attestingIndices.Select(x => state.Validators[(int)(ulong)x].PublicKey)
.ToList();
Root attestationDataRoot = _cryptographyService.HashTreeRoot(indexedAttestation.Data);
Root signingRoot = ComputeSigningRoot(attestationDataRoot, domain);
BlsSignature signature = indexedAttestation.Signature;
//BlsPublicKey aggregatePublicKey = _cryptographyService.BlsAggregatePublicKeys(publicKeys);
//bool isValid = _cryptographyService.BlsVerify(aggregatePublicKey, signingRoot, signature);
bool isValid = _cryptographyService.BlsFastAggregateVerify(publicKeys, signingRoot, signature);
if (!isValid)
{
if (_logger.IsWarn())
{
Log.InvalidIndexedAttestationSignature(_logger, indexedAttestation.Data.Index,
indexedAttestation.Data.Slot, null);
}
return(false);
}
return(true);
}