public static string[] GetPublicKey(string privatekey, string curve = "")
{
privatekey = xTool.ConvertTool.RemoveSpace(privatekey);
ECDSABase ecdsa = new ECDSABase(new ECCurve(curve));
BigInteger PrivateKey = BigInteger.Parse("00" + privatekey, System.Globalization.NumberStyles.AllowHexSpecifier);
if (!ECCMath.RangeBetween(PrivateKey, 1, ECCurve.n - 1))
{
throw new Exception("Invalid Private Key");
}
var PublicKey = ECCMath.ScalarMult(PrivateKey, ECCurve.G);
string[] key = new string[2];
key[0] = Util.ToHexString(PublicKey.X, ECCurve.BitLength);
key[1] = Util.ToHexString(PublicKey.Y, ECCurve.BitLength);
return(key);
}
public bool VerifySignature(ECPoint publicKey, BigInteger e, BigInteger[] signature)
{
if (!ECCMath.RangeBetween(signature[0], BigInteger.One, ECCurve.n - 1))
{
return(false);
}
if (!ECCMath.RangeBetween(signature[1], BigInteger.One, ECCurve.n - 1))
{
return(false);
}
BigInteger w = ECCMath.InverseMod(signature[1], ECCurve.n);
BigInteger u1 = ECCMath.MathMod((e * w), ECCurve.n);
BigInteger u2 = ECCMath.MathMod((signature[0] * w), ECCurve.n);
ECPoint point = ECCMath.PointAdd(ECCMath.ScalarMult(u1, ECCurve.G), ECCMath.ScalarMult(u2, publicKey));
//if (ECCMath.IsInfinityPoint(point))
// return false;
return(ECCMath.MathMod(signature[0], ECCurve.n) == ECCMath.MathMod(point.X, ECCurve.n));
}
public static bool VerifyPublickey(string pub_x, string pub_y, string curve = "")
{
pub_x = xTool.ConvertTool.RemoveSpace(pub_x);
pub_y = xTool.ConvertTool.RemoveSpace(pub_y);
ECDSABase ecdsa = new ECDSABase(new ECCurve(curve));
BigInteger x = BigInteger.Parse("00" + pub_x, System.Globalization.NumberStyles.AllowHexSpecifier);
BigInteger y = BigInteger.Parse("00" + pub_y, System.Globalization.NumberStyles.AllowHexSpecifier);
ECPoint p = new ECPoint(x, y);
if (ECCMath.IsInfinityPoint(p))
{
return(false);
}
if (!ECCMath.RangeBetween(x, BigInteger.One, ECCurve.p - 1))
{
return(false);
}
if (!ECCMath.RangeBetween(y, BigInteger.One, ECCurve.p - 1))
{
return(false);
}
if (!ECCMath.IsOnCurve(p))
{
return(false);
}
ECPoint O = ECCMath.ScalarMult(ECCurve.n, p);
if (!ECCMath.IsInfinityPoint(O))
{
return(false);
}
//throw new Exception("O is NOT Infinity Point");
return(true);
}
public bool VerifySignature_SM2(ECPoint publicKey, BigInteger e, BigInteger[] signature)
{
if (!ECCMath.RangeBetween(signature[0], BigInteger.One, ECCurve.n - 1))
{
return(false);
}
if (!ECCMath.RangeBetween(signature[1], BigInteger.One, ECCurve.n - 1))
{
return(false);
}
BigInteger t = ECCMath.MathMod((signature[0] + signature[1]), ECCurve.n);
if (t.IsZero)
{
return(false);
}
ECPoint point = ECCMath.PointAdd(ECCMath.ScalarMult(signature[1], ECCurve.G),
ECCMath.ScalarMult(t, publicKey));
BigInteger R = ECCMath.MathMod((e + point.X), ECCurve.n);
return(R == signature[0]);
}
