|
public Multiply ( System.Numerics.BigInteger b ) : |
||
| b | System.Numerics.BigInteger | |
| Résultat | ||
public ECPoint GenerateKey(ECPoint publicKey, out byte[] key, BigInteger? k)
{
for (int i = 0; i < 100; i++)
{
if (k == null)
{
byte[] kBytes = new byte[33];
rngCsp.GetBytes(kBytes);
kBytes[32] = 0;
k = new BigInteger(kBytes);
}
if (k.Value.IsZero || k.Value >= Secp256k1.N) continue;
var tag = Secp256k1.G.Multiply(k.Value);
var keyPoint = publicKey.Multiply(k.Value);
if (keyPoint.IsInfinity || tag.IsInfinity) continue;
key = SHA256.DoubleHash(keyPoint.EncodePoint(false));
return tag;
}
throw new Exception("Unable to generate key");
}
public byte[] DecipherKey(BigInteger privateKey, ECPoint tag)
{
var keyPoint = tag.Multiply(privateKey);
var key = SHA256.DoubleHash(keyPoint.EncodePoint(false));
return key;
}
public bool VerifySignature(ECPoint publicKey, byte[] hash, BigInteger r, BigInteger s)
{
if (r >= Secp256k1.N || r.IsZero || s >= Secp256k1.N || s.IsZero)
{
return(false);
}
var z = hash.ToBigIntegerUnsigned(true);
var w = s.ModInverse(Secp256k1.N);
var u1 = (z * w) % Secp256k1.N;
var u2 = (r * w) % Secp256k1.N;
var pt = Secp256k1.G.Multiply(u1).Add(publicKey.Multiply(u2));
var pmod = pt.X % Secp256k1.N;
return(pmod == r);
}
public bool VerifySignature(ECPoint publicKey, byte[] hash, BigInteger r, BigInteger s)
{
if (r >= Secp256k1.N || r.IsZero || s >= Secp256k1.N || s.IsZero)
{
return false;
}
var z = hash.ToBigIntegerUnsigned(true);
var w = s.ModInverse(Secp256k1.N);
var u1 = (z * w) % Secp256k1.N;
var u2 = (r * w) % Secp256k1.N;
var pt = Secp256k1.G.Multiply(u1).Add(publicKey.Multiply(u2));
var pmod = pt.X % Secp256k1.N;
return pmod == r;
}
