public override bool TryAggregatePublicKeys(ReadOnlySpan <byte> publicKeys, 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 (publicKeys.Length % PublicKeyLength != 0)
{
throw new ArgumentOutOfRangeException(nameof(publicKeys), publicKeys.Length, $"Public key data must be a multiple of the public key length {PublicKeyLength}.");
}
if (destination.Length < PublicKeyLength)
{
bytesWritten = 0;
return(false);
}
EnsureInitialised();
var aggregateBlsPublicKey = default(Bls384Interop.BlsPublicKey);
for (var index = 0; index < publicKeys.Length; index += PublicKeyLength)
{
var publicKeySlice = publicKeys.Slice(index, PublicKeyLength);
var blsPublicKey = default(Bls384Interop.BlsPublicKey);
int publicKeyBytesRead;
unsafe
{
// Using fixed pointer for input data allows us to pass a slice
fixed(byte *publicKeyPtr = publicKeySlice)
{
publicKeyBytesRead = Bls384Interop.PublicKeyDeserialize(ref blsPublicKey, publicKeyPtr, PublicKeyLength);
}
}
if (publicKeyBytesRead != PublicKeyLength)
{
throw new Exception($"Error deserializing BLS public key, length: {publicKeyBytesRead}");
}
if (index == 0)
{
aggregateBlsPublicKey = blsPublicKey;
}
else
{
Bls384Interop.PublicKeyAdd(ref aggregateBlsPublicKey, ref blsPublicKey);
}
}
unsafe
{
// Using fixed pointer for output data allows us to write directly to destination
fixed(byte *destinationPtr = destination)
{
bytesWritten = Bls384Interop.PublicKeySerialize(destinationPtr, PublicKeyLength, ref aggregateBlsPublicKey);
}
}
if (bytesWritten != PublicKeyLength)
{
throw new Exception($"Error serializing BLS public key, length: {bytesWritten}");
}
return(true);
}
private void EnsurePublicKey()
{
if (_publicKey == null)
{
if (_privateKey != null)
{
EnsureInitialised();
// Standard values are big endian encoding (are using the Herumi deserialize / serialize)
var blsSecretKey = default(Bls384Interop.BlsSecretKey);
int bytesRead;
unsafe
{
fixed(byte *ptr = _privateKey)
{
bytesRead = Bls384Interop.SecretKeyDeserialize(ref blsSecretKey, ptr, _privateKey.Length);
}
}
if (bytesRead != _privateKey.Length)
{
throw new Exception($"Error deserializing BLS private key, length: {bytesRead}");
}
var blsPublicKey = default(Bls384Interop.BlsPublicKey);
Bls384Interop.GetPublicKey(ref blsPublicKey, ref blsSecretKey);
var buffer = new Span <byte>(new byte[PublicKeyLength]);
int bytesWritten;
unsafe
{
fixed(byte *ptr = buffer)
{
bytesWritten = Bls384Interop.PublicKeySerialize(ptr, buffer.Length, ref blsPublicKey);
}
}
if (bytesWritten != buffer.Length)
{
throw new Exception($"Error serializing BLS public key, length: {bytesWritten}");
}
_publicKey = buffer.ToArray();
}
}
}