public byte[] SignData(Dictionary <string, object> privateKey, byte[] data)
{
var d = BigInt.Parse(privateKey.GetString("d"));
var n = BigInt.Parse(privateKey.GetString("n"));
var m = new BigInt(data);
var s = BigInt.ModPow(m, d, n);
var result = s.ToByteArray();
return(result);
}
public byte[] Encrypt(Dictionary <string, object> publicKey, byte[] data)
{
var e = BigInt.Parse(publicKey.GetString("e"));
var n = BigInt.Parse(publicKey.GetString("n"));
var m = new BigInt(data);
var c = BigInt.ModPow(m, e, n);
var result = c.ToByteArray();
return(result);
}
public byte[] Decrypt(Dictionary <string, object> privateKey, byte[] data)
{
var d = BigInt.Parse(privateKey.GetString("d"));
var n = BigInt.Parse(privateKey.GetString("n"));
var c = new BigInt(data);
var m = BigInt.ModPow(c, d, n);
var result = m.ToByteArray();
return(result);
}
public static bool IsProbablyPrime(this BigInteger value, int witnesses = 10)
{
if (value <= 1 || value.IsEven)
{
return(false);
}
if (witnesses <= 0)
{
witnesses = 10;
}
BigInteger d = value - 1;
int s = 0;
while (d % 2 == 0)
{
d /= 2;
s += 1;
}
Byte[] bytes = new Byte[value.ToByteArray().LongLength];
BigInteger a;
for (int i = 0; i < witnesses; i++)
{
do
{
Rng.GetBytes(bytes);
a = new BigInteger(bytes);
} while (a < 2 || a >= value - 2);
BigInteger x = BigInteger.ModPow(a, d, value);
if (x == 1 || x == value - 1)
{
continue;
}
for (int r = 1; r < s; r++)
{
x = BigInteger.ModPow(x, 2, value);
if (x == 1)
{
return(false);
}
if (x == value - 1)
{
break;
}
}
if (x != value - 1)
{
return(false);
}
}
return(true);
}