我有一个nodejs片段,我想用C#实现它.
const sha256 = require('sha256');
const EC = require('elliptic').ec;
const ec = new EC("secp256k1");
// Serialize a number into an 8-byte array. This is a copy/paste primitive, not worth
// getting into the details.
function uvarint64ToBuf (uint) {
const result = [];
while (uint >= 0x80) {
result.push((uint & 0xFF) | 0x80);
uint >>>= 7;
}
result.push(uint | 0);
return new Buffer(result);
}
// Sign transaction with seed
function signTransaction (seed, txnHex) {
const privateKey = ec.keyFromPrivate(seed);
const transactionBytes = new Buffer(txnHex, 'hex');
const transactionHash = new Buffer(sha256.x2(transactionBytes), 'hex');
const signature = privateKey.sign(transactionHash);
const signatureBytes = new Buffer(signature.toDER());
const signatureLength = uvarint64ToBuf(signatureBytes.length);
const signedTransactionBytes = Buffer.concat([
transactionBytes.slice(0, -1),
signatureLength,
signatureBytes
])
return signedTransactionBytes.toString('hex');
}
示例事务十六进制
01efa5060f5fdae5ed9d90e5f076b2c328a64e347d0c87e8e3317daec5a44fe7c8000102bd53e48625f49e60ff6b7a934e3871b54cc2a93a8737352e8320549e42e2322bab0405270000167b22426f6479223a2248656c6c6f20576f726c64227de807d461f4df9efad8a0f3f716002102bd53e48625f49e60ff6b7a934e3871b54cc2a93a8737352e8320549e42e2322b0000
javascript函数返回的签名事务十六进制示例
01efa5060f5fdae5ed9d90e5f076b2c328a64e347d0c87e8e3317daec5a44fe7c8000102bd53e48625f49e60ff6b7a934e3871b54cc2a93a8737352e8320549e42e2322bab0405270000167b22426f6479223a2248656c6c6f20576f726c64227de807d461f4df9efad8a0f3f716002102bd53e48625f49e60ff6b7a934e3871b54cc2a93a8737352e8320549e42e2322b00473045022100c36e2b80f2160304cf640b1296244e7a3873aacf2831098bca3727ad06f4c270022007d3697ceef266a05ad70219d92fbd570f6ec7a5731aaf02718213067d42d1cf
如果你注意到签名的十六进制是TransactionHex + 47 (length of signature) + 473045022100c36e2b80f2160304cf640b1296244e7a3873aacf2831098bca3727ad06f4c270022007d3697ceef266a05ad70219d92fbd570f6ec7a5731aaf02718213067d42d1cf (actual signature)
我试图使用Unity3d中的C#Bouncy Castle库生成签名部分,但没有成功.
这是C代码(source)
public string GetSignature(string privateKey, string message)
{
var curve = SecNamedCurves.GetByName("secp256k1");
var domain = new ECDomainParameters(curve.Curve, curve.G, curve.N, curve.H);
var keyParameters = new ECPrivateKeyParameters(new BigInteger(privateKey, 16), domain);
var signer = new ECDsaSigner(new HMacDsaKCalculator(new Sha256Digest()));
signer.Init(true, keyParameters);
var signature = signer.GenerateSignature(Encoding.UTF8.GetBytes(message));
var r = signature[0];
var s = signature[1];
var otherS = curve.Curve.Order.Subtract(s);
if (s.CompareTo(otherS) == 1)
{
s = otherS;
}
var derSignature = new DerSequence
(
new DerInteger(new BigInteger(1, r.ToByteArray())),
new DerInteger(new BigInteger(1, s.ToByteArray()))
)
.GetDerEncoded();
return Convert(derSignature);
}
public string Convert(byte[] input)
{
return string.Concat(input.Select(x => x.ToString("x2")));
}
public byte[] Convert(string input)
{
if (input.StartsWith("0x")) input = input.Remove(0, 2);
return Enumerable.Range(0, input.Length / 2).Select(x => System.Convert.ToByte(input.Substring(x * 2, 2), 16)).ToArray();
}
这确实会生成一个签名,但它与我上面提到的签名不同.
签名由GetSignature
生成
3044022018a06b1f2b8a1e2f5ea2a78b0d6d98ec483b9fa4345821cfef892be6c825ff4702207958160e533c801dff5e50600206e1cd938d6df74ebfa4b0347a95de67dda986
P.S.Here相当于python对事务进行签名以供参考.