public void MultipleSignatureWays()
{
var privKeyStr = Encoders.Hex.DecodeData("8e812436a0e3323166e1f0e8ba79e19e217b2c4a53c970d4cca0cfb1078979df");
Key key = new Key(privKeyStr);
Assert.AreEqual("04a5bb3b28466f578e6e93fbfd5f75cee1ae86033aa4bbea690e3312c087181eb366f9a1d1d6a437a9bf9fc65ec853b9fd60fa322be3997c47144eb20da658b3d1", key.PubKey.Decompress().ToHex());
var messageToSign = "159817a085f113d099d3d93c051410e9bfe043cc5c20e43aa9a083bf73660145";
var messageBytes = Encoders.Hex.DecodeData(messageToSign);
ECDSASignature signature = key.Sign(new uint256(messageBytes), true);
SecpECDSASignature.TryCreateFromDer(signature.ToDER(), out SecpECDSASignature sig);
var(r, s) = sig;
var R = r.ToBytes();
var S = s.ToBytes();
Assert.AreEqual("38b7dac5ee932ac1bf2bc62c05b792cd93c3b4af61dc02dbb4b93dacb758123f", R.ToHexString());
Assert.AreEqual("08bf123eabe77480787d664ca280dc1f20d9205725320658c39c6c143fd5642d", S.ToHexString());
// Compact signature
byte[] signatureCompact = key.SignCompact(new uint256(messageBytes), true);
if (signatureCompact.Length != 65)
{
throw new ArgumentException(paramName: nameof(signatureCompact), message: "Signature truncated, expected 65");
}
var ss = signatureCompact.AsSpan();
int recid = (ss[0] - 27) & 3;
if (!(
SecpRecoverableECDSASignature.TryCreateFromCompact(ss.Slice(1), recid, out SecpRecoverableECDSASignature sigR) && sigR is SecpRecoverableECDSASignature
)
)
{
throw new InvalidOperationException("Impossible to recover the public key");
}
// V from comapct signature
var(r1, s1, v1) = sigR;
Assert.AreEqual(v1, 0);
// Recoverable signature with Secp256k1 lib
NBitcoin.Secp256k1.ECPrivKey privKey = Context.Instance.CreateECPrivKey(new Scalar(key.ToBytes()));
Assert.AreEqual(key.PubKey.ToBytes(), privKey.CreatePubKey().ToBytes());
privKey.TrySignRecoverable(messageBytes, out SecpRecoverableECDSASignature sigRec);
var(r2, s2, v2) = sigRec;
Assert.AreEqual(r2, r);
Assert.AreEqual(s2, s);
Assert.AreEqual(v2, v1);
}
public void SignWithECPrivKey()
{
var privKeyStr = Encoders.Hex.DecodeData("cdce32b32436ff20c2c32ee55cd245a82fff4c2dc944da855a9e0f00c5d889e4");
Key key = new Key(privKeyStr);
NBitcoin.Secp256k1.ECPrivKey privKey = Context.Instance.CreateECPrivKey(new Scalar(key.ToBytes()));
var messageToSign = "159817a085f113d099d3d93c051410e9bfe043cc5c20e43aa9a083bf73660145";
var messageBytes = Encoders.Hex.DecodeData(messageToSign);
privKey.TrySignRecoverable(messageBytes, out SecpRecoverableECDSASignature sigRec);
var(r, s, v) = sigRec;
var R = r.ToBytes().ToHexString();
var S = s.ToBytes().ToHexString();
Assert.AreEqual("84de8230e66c6507dea6de6d925c76ac0db85d99ddd3c069659d0970ade8876a", R);
Assert.AreEqual("0dcd4adb2e40fcf257da419b88c1e7dd4d92750b63381d8379b96f3b7b8a4498", S);
Assert.AreEqual(1, v);
}
public Signature Sign(byte[] message)
{
if (message.Length != 32)
{
throw new ArgumentException(paramName: nameof(message), message: "Message should be 32 bytes");
}
NBitcoin.Secp256k1.ECPrivKey privKey = Context.Instance.CreateECPrivKey(new Scalar(PrivateKey.ToBytes()));
if (!privKey.TrySignRecoverable(message, out SecpRecoverableECDSASignature sigRec))
{
throw new InvalidOperationException();
}
var(r, s, recId) = sigRec;
return(new Signature()
{
R = r.ToBytes(),
S = s.ToBytes(),
RecId = recId
});
}
