public static byte[] SignWithPrivateKey(byte[] privateKey, byte[] hash)
{
try
{
Lock.AcquireWriterLock(Timeout.Infinite);
var recSig = new byte[65];
var compactSig = new byte[65];
Secp256K1.SignRecoverable(recSig, hash, privateKey);
Secp256K1.RecoverableSignatureSerializeCompact(compactSig, out var recoverId, recSig);
compactSig[64] = (byte)recoverId; // put recover id at the last slot
return(compactSig);
}
finally
{
Lock.ReleaseWriterLock();
}
}
public static byte[] SignWithPrivateKey(byte[] privateKey, byte[] hash)
{
try
{
Lock.AcquireWriterLock(Timeout.Infinite);
var recSig = new byte[65];
var compactSig = new byte[65];
if (!Secp256K1.SignRecoverable(recSig, hash, privateKey))
{
throw new SignatureOperationException("Create a recoverable ECDSA signature failed.");
}
if (!Secp256K1.RecoverableSignatureSerializeCompact(compactSig, out var recoverId, recSig))
{
throw new SignatureOperationException("Serialize an ECDSA signature failed.");
}
compactSig[64] = (byte)recoverId; // put recover id at the last slot
return(compactSig);
}
finally
{
Lock.ReleaseWriterLock();
}
}
// mimic of SignHashed of DefaultCrypto.cs but using different chain id
public byte[] SignHashed(byte[] messageHash, byte[] privateKey, bool useNewChainId)
{
if (privateKey.Length != 32)
{
throw new ArgumentException(nameof(privateKey));
}
if (messageHash.Length != 32)
{
throw new ArgumentException(nameof(messageHash));
}
return(EcSign.Benchmark(() =>
{
var sig = new byte[65];
if (!Secp256K1.SignRecoverable(sig, messageHash, privateKey))
{
throw new Exception("secp256k1.sign_recoverable failed");
}
var serialized = new byte[64];
if (!Secp256K1.RecoverableSignatureSerializeCompact(serialized, out var recId, sig))
{
throw new Exception("Cannot serialize recoverable signature: how did it happen?");
}
recId = ChainId(useNewChainId) * 2 + 35 + recId;
var recIdBytes = new byte[useNewChainId ? 2 : 1];
var fullBin = recId.ToBytes().ToArray();
if (useNewChainId)
{
recIdBytes[0] = fullBin[1];
recIdBytes[1] = fullBin[0];
}
else
{
recIdBytes[0] = fullBin[0];
}
return serialized.Concat(recIdBytes).ToArray();
}));
}