private static ECDsa LoadPrivateKey(byte[] key)
{
BigInteger privKeyInt = new BigInteger(+1, key);
X9ECParameters parameters = SecNamedCurves.GetByName("secp256k1");
ECPoint ecPoint = parameters.G.Multiply(privKeyInt);
byte[] privKeyX = ecPoint.Normalize().XCoord.ToBigInteger().ToByteArrayUnsigned();
byte[] privKeyY = ecPoint.Normalize().YCoord.ToBigInteger().ToByteArrayUnsigned();
return(ECDsa.Create(new ECParameters
{
Curve = ECCurve.CreateFromFriendlyName("secp256k1"),
D = privKeyInt.ToByteArrayUnsigned(),
Q = new System.Security.Cryptography.ECPoint
{
X = privKeyX,
Y = privKeyY
}
}));
}
private string PrivateKeyHexToPublicKeyHex(string privateKeyHex)
{
byte[] privateKeyBytes = this.ValidateAndGetPrivateKeyBytes(privateKeyHex, 0x00);
if (privateKeyBytes == null)
{
return(null);
}
X9ECParameters curves = SecNamedCurves.GetByName("secp256k1");
BigInteger privateKeyInteger = new BigInteger(privateKeyBytes);
ECPoint p = curves.G.Multiply(privateKeyInteger);
byte[] publicAddress = new byte[65];
byte[] y = p.Normalize().YCoord.ToBigInteger().ToByteArray();
Array.Copy(y, 0, publicAddress, 64 - y.Length + 1, y.Length);
byte[] x = p.Normalize().XCoord.ToBigInteger().ToByteArray();
Array.Copy(x, 0, publicAddress, 32 - x.Length + 1, x.Length);
publicAddress[0] = 4;
return(this.ByteArrayToString(publicAddress));
}
