public static string GetPublicKeyFromPrivateKey(string privateKey)
{
var p = BigInteger.Parse("0FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2F",
NumberStyles.HexNumber);
var b = (BigInteger)7;
var a = BigInteger.Zero;
var Gx = BigInteger.Parse("79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798",
NumberStyles.HexNumber);
var Gy = BigInteger.Parse("483ADA7726A3C4655DA4FBFC0E1108A8FD17B448A68554199C47D08FFB10D4B8",
NumberStyles.HexNumber);
CurveFp curve256 = new CurveFp(p, a, b);
Point generator256 = new Point(curve256, Gx, Gy);
var secret = BigInteger.Parse(privateKey, NumberStyles.HexNumber);
var pubkeyPoint = generator256 * secret;
return(pubkeyPoint.X.ToString("X") + pubkeyPoint.Y.ToString("X"));
}
public Point(CurveFp curve, BigInteger x, BigInteger y)
{
this.Curve = curve;
this.X = x;
this.Y = y;
}
