public EllipticDiffieHellman(EllipticCurve curve, CurvePoint generator, IntX order, byte[] priv = null)
{
this.curve = curve;
this.generator = generator;
// Generate private key
if (priv == null)
{
byte[] max = order.ToArray();
do
{
byte[] p1 = new byte[5 /*rand.Next(max.Length) + 1*/];
rand.GetBytes(p1);
if (p1.Length == max.Length)
{
p1[p1.Length - 1] %= max[max.Length - 1];
}
else
{
p1[p1.Length - 1] &= 127;
}
this.priv = DHHelper.FromArray(p1);
} while (this.priv < 2);
}
else
{
this.priv = DHHelper.FromArray(priv);
}
// Generate public key
pub = curve.Multiply(generator, this.priv);
}
public EllipticDiffieHellman(EllipticCurve curve, CurvePoint generator, BigInteger order, byte[] priv = null)
{
this.curve = curve;
this.generator = generator;
// Generate private key
if (priv == null)
{
this.priv = new BigInteger();
this.priv.GenRandomBits(order.DataLength, rand);
}
else
{
this.priv = new BigInteger(priv);
}
// Generate public key
pub = curve.Multiply(generator, this.priv);
}