public ElGamalCipher(ElGamalKeyStruct elg_current_key)
{
// set the key details
current_key = elg_current_key;
// calculate the blocksizes
plaintext_blocksize = (elg_current_key.P.bitCount() - 1) / 8;
ciphertext_blocksize = ((elg_current_key.P.bitCount() + 7) / 8) * 2; //ciphertext is twice as plaintext
// set the default block for plaintext
block_size = plaintext_blocksize;
}
public ImplementationClass()
{
current_key = new ElGamalKeyStruct();
current_key.P = new BigInteger(0);
current_key.G = new BigInteger(0);
current_key.Y = new BigInteger(0);
current_key.X = new BigInteger(0);
// default key size
KeySizeValue = 384;
//range of keys
LegalKeySizesValue = new[] { new KeySizes(384, 1088, 8) };
}
public ElGamalDecrypt(ElGamalKeyStruct p_struct) : base(p_struct)
{
// set the default block size to be ciphertext
block_size = ciphertext_blocksize;
}
public ElGamalEncrypt(ElGamalKeyStruct p_struct) : base(p_struct)
{
random_number = new Random();
}
