private bool FastAggregateVerifyData(IList <byte[]>?publicKeyList, ReadOnlySpan <byte> publicKeysSpan, ReadOnlySpan <byte> data,
ReadOnlySpan <byte> aggregateSignature)
{
// This is independent of the keys set, although other parameters (type of curve, variant, scheme, etc) are relevant.
if (aggregateSignature.Length != SignatureLength)
{
throw new ArgumentOutOfRangeException(nameof(aggregateSignature), aggregateSignature.Length,
$"Signature must be {SignatureLength} bytes long.");
}
EnsureInitialised();
var publicKeyCount = publicKeyList?.Count ?? publicKeysSpan.Length / PublicKeyLength;
var blsPublicKeys = new Bls384Interop.BlsPublicKey[publicKeyCount];
if (publicKeyList == null)
{
if (publicKeysSpan.Length % PublicKeyLength != 0)
{
throw new ArgumentOutOfRangeException(nameof(publicKeysSpan), publicKeysSpan.Length,
$"Public key data must be a multiple of the public key length {PublicKeyLength}.");
}
}
var publicKeysIndex = 0;
for (var blsPublicKeyIndex = 0; blsPublicKeyIndex < publicKeyCount; blsPublicKeyIndex++)
{
var publicKey = (publicKeyList != null)
? publicKeyList[blsPublicKeyIndex]
: publicKeysSpan.Slice(publicKeysIndex, PublicKeyLength);
int publicKeyBytesRead;
unsafe
{
fixed(byte *publicKeyPtr = publicKey)
{
publicKeyBytesRead = Bls384Interop.PublicKeyDeserialize(
ref blsPublicKeys[blsPublicKeyIndex],
publicKeyPtr, PublicKeyLength);
}
}
if (publicKeyBytesRead != PublicKeyLength)
{
throw new Exception(
$"Error deserializing BLS public key {blsPublicKeyIndex}, length: {publicKeyBytesRead}");
}
publicKeysIndex += PublicKeyLength;
}
var aggregateBlsSignature = default(Bls384Interop.BlsSignature);
int signatureBytesRead;
unsafe
{
fixed(byte *signaturePtr = aggregateSignature)
{
signatureBytesRead =
Bls384Interop.SignatureDeserialize(ref aggregateBlsSignature, signaturePtr, SignatureLength);
}
}
if (signatureBytesRead != aggregateSignature.Length)
{
throw new Exception($"Error deserializing BLS signature, length: {signatureBytesRead}");
}
int result;
unsafe
{
fixed(byte *dataPtr = data)
{
result = Bls384Interop.FastAggregateVerify(ref aggregateBlsSignature, blsPublicKeys, publicKeyCount,
dataPtr, data.Length);
}
}
return(result == 1);
}