public static string GenerateSecp256k1PublicKey(string privateKey, bool useCompression)
{
var Ecc = SecNamedCurves.GetByName("secp256k1");
var DomainParams = new ECDomainParameters(Ecc.Curve, Ecc.G, Ecc.N, Ecc.H);
var bytes = Hex.Hex2Bytes(privateKey);
BigInteger d = new BigInteger(bytes);
ECPoint q = DomainParams.G.Multiply(d);
q = q.Normalize();
var publicParams = new ECPublicKeyParameters(q, DomainParams);
FpPoint fp = new FpPoint(Ecc.Curve, q.AffineXCoord, q.AffineYCoord);
return(Hex.Bytes2Hex(fp.GetEncoded(useCompression)));
}
public static byte[] XOR(string hex1, string hex2)
{
if (hex1.Length != hex2.Length)
{
throw new Exception("XOR cannot run on different length strings.");
}
byte[] bytes1 = Hex.Hex2Bytes(hex1);
byte[] bytes2 = Hex.Hex2Bytes(hex2);
for (int i = 0; i < bytes1.Length; i++)
{
bytes1[i] = (byte)(bytes1[i] ^ bytes2[i]);
}
return(bytes1);
}
public static byte[] InsertAddressVersion(string pubkeyHash, string version)
{
var pubkeyHashBytes = Hex.Hex2Bytes(pubkeyHash);
var versionBytes = Hex.Hex2Bytes(version);
int space = (int)Math.Floor(20f / versionBytes.Length);
byte[] extended = new byte[pubkeyHashBytes.Length + versionBytes.Length];
for (int i = 0, j = 0; i < pubkeyHashBytes.Length; i += space, j++)
{
var len = space;
if (i + space >= pubkeyHashBytes.Length)
{
len = pubkeyHashBytes.Length - i;
}
Buffer.BlockCopy(versionBytes, j, extended, i + j, 1);
Buffer.BlockCopy(pubkeyHashBytes, i, extended, i + j + 1, len);
}
return(extended);
}
