public void TestTextEncryption()
{
int keySize;
ElGamalPaddingMode padding = ElGamalPaddingMode.Zeros;
string message = "Programming .NET Security";
var plaintext = Encoding.Default.GetBytes(message);
ElGamal algorithm = new ElGamalManaged();
algorithm.Padding = padding;
for (keySize = 384; keySize <= 1088; keySize += 8)
{
algorithm.KeySize = keySize;
string parametersXML = algorithm.ToXmlString(true);
ElGamal encryptAlgorithm = new ElGamalManaged();
encryptAlgorithm.FromXmlString(algorithm.ToXmlString(false));
byte[] ciphertext = encryptAlgorithm.EncryptData(plaintext);
ElGamal decryptAlgorithm = new ElGamalManaged();
decryptAlgorithm.FromXmlString(algorithm.ToXmlString(true));
byte[] candidatePlaintext = decryptAlgorithm.DecryptData(ciphertext);
CollectionAssert.AreEqual(plaintext, candidatePlaintext, "Failed at keysize: " + keySize.ToString());
}
}
public static void TestTextEncryption(string message = "Programming .NET Security", int keySize = 1024, ElGamalPaddingMode padding = ElGamalPaddingMode.Zeros)
{
Console.WriteLine();
Console.WriteLine("-- Testing string encryption ---");
var plaintext = Encoding.Default.GetBytes(message);
ElGamal algorithm = new ElGamalManaged();
algorithm.KeySize = keySize;
algorithm.Padding = padding;
string parametersXML = algorithm.ToXmlString(true);
Console.WriteLine("\n{0}\n", PrettifyXML(parametersXML));
ElGamal encryptAlgorithm = new ElGamalManaged();
encryptAlgorithm.FromXmlString(algorithm.ToXmlString(false));
byte[] ciphertext = encryptAlgorithm.EncryptData(plaintext);
ElGamal decryptAlgorithm = new ElGamalManaged();
decryptAlgorithm.FromXmlString(algorithm.ToXmlString(true));
byte[] candidatePlaintext = decryptAlgorithm.DecryptData(ciphertext);
Console.WriteLine("Original string: '{0}'", message);
Console.WriteLine("Decrypted string: '{0}'", Encoding.Default.GetString(candidatePlaintext));
Console.WriteLine("Byte arrays equal: {0}", plaintext.SequenceEqual(candidatePlaintext));
Console.WriteLine();
}
