/// <inheritdoc />
public override bool TryAggregateSignatures(ReadOnlySpan <byte> signatures, Span <byte> destination,
out int bytesWritten)
{
// This is independent of the keys set, although other parameters (type of curve, variant, scheme, etc) are relevant.
if (signatures.Length % SignatureLength != 0)
{
throw new ArgumentOutOfRangeException(nameof(signatures), signatures.Length,
$"Signature data must be a multiple of the signature length {SignatureLength}.");
}
if (destination.Length < SignatureLength)
{
bytesWritten = 0;
return(false);
}
EnsureInitialised();
var aggregateBlsSignature = default(Bls384Interop.BlsSignature);
for (var index = 0; index < signatures.Length; index += SignatureLength)
{
var signatureSlice = signatures.Slice(index, SignatureLength);
var blsSignature = default(Bls384Interop.BlsSignature);
int signatureBytesRead;
unsafe
{
// Using fixed pointer for input data allows us to pass a slice
fixed(byte *signaturePtr = signatureSlice)
{
signatureBytesRead =
Bls384Interop.SignatureDeserialize(ref blsSignature, signaturePtr, SignatureLength);
}
}
if (signatureBytesRead != SignatureLength)
{
throw new Exception($"Error deserializing BLS signature, length: {signatureBytesRead}");
}
if (index == 0)
{
aggregateBlsSignature = blsSignature;
}
else
{
Bls384Interop.SignatureAdd(ref aggregateBlsSignature, ref blsSignature);
}
}
unsafe
{
// Using fixed pointer for output data allows us to write directly to destination
fixed(byte *destinationPtr = destination)
{
bytesWritten =
Bls384Interop.SignatureSerialize(destinationPtr, SignatureLength, ref aggregateBlsSignature);
}
}
if (bytesWritten != SignatureLength)
{
throw new Exception($"Error serializing BLS signature, length: {bytesWritten}");
}
return(true);
}
