public static CryptoPoint operator *(CryptoPoint left, BigInteger right)
{
var e = right;
if (e == 0 || left == INFINITY)
{
return(INFINITY);
}
var e3 = 3 * e;
var negativeLeft = new CryptoPoint(left.Curve, left.X, -left.Y);
var i = LeftmostBit(e3) / 2;
var result = left;
while (i > 1)
{
result = result.Double();
if ((e3 & i) != 0 && (e & i) == 0)
{
result += left;
}
if ((e3 & i) == 0 && (e & i) != 0)
{
result += negativeLeft;
}
i /= 2;
}
return(result);
}
public string GetPublicKeyFromPrivateKey(string privateKey)
{
BigInteger p = BigInteger.Parse("0FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2F", NumberStyles.HexNumber);
BigInteger b = (BigInteger)7;
BigInteger a = BigInteger.Zero;
BigInteger Gx = BigInteger.Parse("79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798", NumberStyles.HexNumber);
BigInteger Gy = BigInteger.Parse("483ADA7726A3C4655DA4FBFC0E1108A8FD17B448A68554199C47D08FFB10D4B8", NumberStyles.HexNumber);
CryptoCurve curve256 = new CryptoCurve(p, a, b);
CryptoPoint generator256 = new CryptoPoint(curve256, Gx, Gy);
BigInteger secret = BigInteger.Parse(privateKey, NumberStyles.HexNumber);
CryptoPoint pubkeyPoint = generator256 * secret;
return(pubkeyPoint.X.ToString("X") + pubkeyPoint.Y.ToString("X"));
}