/// <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
if (attestingIndices.Count() > 1)
{
for (int index = 0; index < attestingIndices.Count() - 1; index++)
{
if (!(attestingIndices[index] < attestingIndices[index + 1]))
{
if (_logger.IsWarn()) Log.InvalidIndexedAttestationNotSorted(_logger, indexedAttestation.Data.Index, indexedAttestation.Data.Slot, 0, index, null);
return false;
}
}
}
// Verify aggregate signature
IEnumerable<BlsPublicKey> publicKeys = attestingIndices.Select(x => state.Validators[(int) (ulong) x].PublicKey);
BlsPublicKey aggregatePublicKey = _cryptographyService.BlsAggregatePublicKeys(publicKeys);
Hash32 messageHash = _cryptographyService.HashTreeRoot(indexedAttestation.Data);
BlsSignature signature = indexedAttestation.Signature;
bool isValid = _cryptographyService.BlsVerify(aggregatePublicKey, messageHash, signature, domain);
if (!isValid)
{
if (_logger.IsWarn()) Log.InvalidIndexedAttestationSignature(_logger, indexedAttestation.Data.Index, indexedAttestation.Data.Slot, null);
return false;
}
return true;
}
public void ProcessBlockHeader(BeaconState state, BeaconBlock block)
{
_logger.LogInformation(Event.ProcessBlock, "Process block header for block {BeaconBlock}", block);
// Verify that the slots match
if (block.Slot != state.Slot)
{
throw new ArgumentOutOfRangeException("block.Slot", block.Slot, $"Block slot must match state slot {state.Slot}.");
}
// Verify that the parent matches
var latestBlockSigningRoot = state.LatestBlockHeader.SigningRoot();
if (block.ParentRoot != latestBlockSigningRoot)
{
throw new ArgumentOutOfRangeException("block.ParentRoot", block.ParentRoot, $"Block parent root must match latest block header root {latestBlockSigningRoot}.");
}
// Save current block as the new latest block
var bodyRoot = block.Body.HashTreeRoot(_miscellaneousParameterOptions.CurrentValue, _maxOperationsPerBlockOptions.CurrentValue);
var newBlockHeader = new BeaconBlockHeader(block.Slot,
block.ParentRoot,
Hash32.Zero, // `state_root` is zeroed and overwritten in the next `process_slot` call
bodyRoot,
new BlsSignature() //`signature` is zeroed
);
state.SetLatestBlockHeader(newBlockHeader);
// Verify proposer is not slashed
var beaconProposerIndex = _beaconStateAccessor.GetBeaconProposerIndex(state);
var proposer = state.Validators[(int)(ulong)beaconProposerIndex];
if (proposer.IsSlashed)
{
throw new Exception("Beacon proposer must not be slashed.");
}
// Verify proposer signature
var signingRoot = block.SigningRoot(_miscellaneousParameterOptions.CurrentValue, _maxOperationsPerBlockOptions.CurrentValue);
var domain = _beaconStateAccessor.GetDomain(state, _signatureDomainOptions.CurrentValue.BeaconProposer, Epoch.None);
var validSignature = _cryptographyService.BlsVerify(proposer.PublicKey, signingRoot, block.Signature, domain);
if (!validSignature)
{
throw new Exception($"Block signature must match proposer public key {proposer.PublicKey}");
}
}