/**
* given a message from a given party and the corresponding public key
* calculate the next message in the agreement sequence. In this case
* this will represent the shared secret.
*/
public BigInteger CalculateAgreement(
DHPublicKeyParameters pub,
BigInteger message)
{
if (pub == null)
throw new ArgumentNullException("pub");
if (message == null)
throw new ArgumentNullException("message");
if (!pub.Parameters.Equals(dhParams))
{
throw new ArgumentException("Diffie-Hellman public key has wrong parameters.");
}
BigInteger p = dhParams.P;
return message.ModPow(key.X, p).Multiply(pub.Y.ModPow(privateValue, p)).Mod(p);
}
protected bool Equals(
DHPublicKeyParameters other)
{
return y.Equals(other.y) && base.Equals(other);
}