/// <summary>
/// Public key operation. Encrypts biInput with the keydata
/// in the given public key packet.
/// </summary>
/// <param name="biInput">The plaintext that is about to
/// be encrypted</param>
/// <param name="pkpKey">The public key packet with the key
/// material for the encryption</param>
/// <returns>The encrypted ciphertext.</returns>
/// <remarks>No remarks.</remarks>
public override BigInteger[] Encrypt(BigInteger biInput, PublicKeyPacket pkpKey)
{
EG_Public_Key epkKey = new EG_Public_Key();
epkKey.p = pkpKey.KeyMaterial[0];
epkKey.g = pkpKey.KeyMaterial[1];
epkKey.y = pkpKey.KeyMaterial[2];
BigInteger k = new BigInteger();
//Random number needed for encryption
k = BigInteger.genRandom(epkKey.p.bitCount() - 1);
while (k > (epkKey.p - 1))
{
k = new BigInteger();
k = BigInteger.genRandom(epkKey.p.bitCount() - 1);
}
BigInteger B = epkKey.g.modPow(k, epkKey.p);
BigInteger c = epkKey.y.modPow(k, epkKey.p);
c = (biInput * c) % epkKey.p;
//BigInteger c = (biInput * epkKey.y.modPow(k, epkKey.p)) % epkKey.p;
BigInteger[] biOutput = new BigInteger[2];
biOutput[0] = B;
biOutput[1] = c;
return(biOutput);
}
/// <summary>
/// Public key operation. Encrypts biInput with the keydata
/// in the given public key packet.
/// </summary>
/// <param name="biInput">The plaintext that is about to
/// be encrypted</param>
/// <param name="pkpKey">The public key packet with the key
/// material for the encryption</param>
/// <returns>The encrypted ciphertext.</returns>
/// <remarks>No remarks.</remarks>
public override BigInteger[] Encrypt(BigInteger biInput, PublicKeyPacket pkpKey)
{
EG_Public_Key epkKey = new EG_Public_Key();
epkKey.p = pkpKey.KeyMaterial[0];
epkKey.g = pkpKey.KeyMaterial[1];
epkKey.y = pkpKey.KeyMaterial[2];
BigInteger k = new BigInteger();
//Random number needed for encryption
k = BigInteger.genRandom(epkKey.p.bitCount()-1);
while (k > (epkKey.p-1)) {
k = new BigInteger();
k = BigInteger.genRandom(epkKey.p.bitCount()-1);
}
BigInteger B = epkKey.g.modPow(k, epkKey.p);
BigInteger c = epkKey.y.modPow(k, epkKey.p);
c = (biInput * c) % epkKey.p;
//BigInteger c = (biInput * epkKey.y.modPow(k, epkKey.p)) % epkKey.p;
BigInteger[] biOutput = new BigInteger[2];
biOutput[0] = B;
biOutput[1] = c;
return biOutput;
}
