private static byte[] DecryptKey(byte[] stretchedKey, byte[] buffer, int offset)
{
using var twofish = new TwofishManaged();
twofish.Mode = CipherMode.ECB;
twofish.Padding = PaddingMode.None;
twofish.KeySize = 256;
twofish.Key = stretchedKey;
using var transform = twofish.CreateDecryptor();
return(transform.TransformFinalBlock(buffer, offset, 32));
}
private static byte[] DecryptData(byte[] key, byte[] iv, byte[] buffer, int offset, int length)
{
using var twofish = new TwofishManaged();
twofish.Mode = CipherMode.CBC;
twofish.Padding = PaddingMode.None;
twofish.KeySize = 256;
twofish.Key = key;
twofish.IV = iv;
using var dataDecryptor = twofish.CreateDecryptor();
return(dataDecryptor.TransformFinalBlock(buffer, offset, length));
}
public void Twofish_MultiBlockFinal_ECB_256_Decrypt()
{
var key = ParseBytes("0000000000000000000000000000000000000000000000000000000000000000");
var ct = ParseBytes("57FF739D4DC92C1BD7FC01700CC8216F57FF739D4DC92C1BD7FC01700CC8216F57FF739D4DC92C1BD7FC01700CC8216F");
using (var algorithm = new TwofishManaged()
{
KeySize = 256, Mode = CipherMode.ECB, Padding = PaddingMode.None
}) {
algorithm.Key = key;
var pt = algorithm.CreateDecryptor().TransformFinalBlock(ct, 0, ct.Length);
Assert.AreEqual("000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000", BitConverter.ToString(pt).Replace("-", ""));
}
}
public void Twofish_TransformBlock_Decrypt_UseSameArray()
{
var key = ParseBytes("00000000000000000000000000000000");
var iv = ParseBytes("00000000000000000000000000000000");
var ctpt = ParseBytes("B0DD30E9AB1F1329C1BEE154DDBE88AF8C47A4FE24D56DC027ED503652C9D164CE26E0C6E32BCA8756482B99988E8C79");
using (var twofish = new TwofishManaged()
{
Mode = CipherMode.CBC, Padding = PaddingMode.None, KeySize = 128, Key = key, IV = iv
}) {
using (var transform = twofish.CreateDecryptor()) {
transform.TransformBlock(ctpt, 0, 48, ctpt, 0); //no caching last block if Padding is none
}
}
Assert.AreEqual("The quick brown fox jumps over the lazy dog once", Encoding.UTF8.GetString(ctpt));
}
public void Twofish_MultiBlockFinal_CBC_256_Decrypt()
{
var key = ParseBytes("0000000000000000000000000000000000000000000000000000000000000000");
var iv = ParseBytes("00000000000000000000000000000000");
var ct = ParseBytes("61B5BC459C4E9491DD9E6ACB7478813047BE7250D34F792C17F0C23583C0B040B95C9FAE11107EE9BAC3D79BBFE019EE");
using (var algorithm = new TwofishManaged()
{
KeySize = 256, Mode = CipherMode.CBC, Padding = PaddingMode.None
}) {
algorithm.Key = key;
algorithm.IV = iv;
var pt = algorithm.CreateDecryptor().TransformFinalBlock(ct, 0, ct.Length);
Assert.AreEqual("9F589F5CF6122C32B6BFEC2F2AE8C35A9F589F5CF6122C32B6BFEC2F2AE8C35A9F589F5CF6122C32B6BFEC2F2AE8C35A", BitConverter.ToString(pt).Replace("-", ""));
}
}
public static void Main(string[] args)
{
Console.Title = "Twofish.Tests";
var bIn = Encoding.UTF8.GetBytes("It works!");
byte[] key = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 }; // 128bit key
byte[] iv = { 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1 }; // initialization vector
using (var algorithm = new TwofishManaged {
KeySize = key.Length * 8, Mode = CipherMode.CBC
})
{
byte[] encrypted;
using (var ms = new MemoryStream())
{
using (var transform = algorithm.CreateEncryptor(key, iv))
{
using (var cs = new CryptoStream(ms, transform, CryptoStreamMode.Write))
{
cs.Write(bIn, 0, bIn.Length);
}
}
encrypted = ms.ToArray();
Console.WriteLine($"Encrypted: {BitConverter.ToString(encrypted).Replace("-", string.Empty)}");
}
using (var ms = new MemoryStream())
{
using (var transform = algorithm.CreateDecryptor(key, iv))
{
using (var cs = new CryptoStream(ms, transform, CryptoStreamMode.Write))
{
cs.Write(encrypted, 0, encrypted.Length);
}
}
Console.WriteLine($"Decrypted: {Encoding.UTF8.GetString(ms.ToArray())}");
}
}
Console.Read();
}
public static bool TestTwofish()
{
TwofishManaged twofish = new TwofishManaged();
twofish.Padding = PaddingMode.None;
twofish.Mode = CipherMode.ECB;
byte[] key = new byte[] { 0xD4, 0x3B, 0xB7, 0x55, 0x6E, 0xA3, 0x2E, 0x46, 0xF2, 0xA2, 0x82, 0xB7, 0xD4, 0x5B, 0x4E, 0x0D, 0x57, 0xFF, 0x73, 0x9D, 0x4D, 0xC9, 0x2C, 0x1B, 0xD7, 0xFC, 0x01, 0x70, 0x0C, 0xC8, 0x21, 0x6F };
byte[] plaintext = new byte[] { 0x90, 0xAF, 0xE9, 0x1B, 0xB2, 0x88, 0x54, 0x4F, 0x2C, 0x32, 0xDC, 0x23, 0x9B, 0x26, 0x35, 0xE6 };
byte[] ciphertext = new byte[] { 0x6C, 0xB4, 0x56, 0x1C, 0x40, 0xBF, 0x0A, 0x97, 0x05, 0x93, 0x1C, 0xB6, 0xD4, 0x08, 0xE7, 0xFA };
byte[] initializationVector = new byte[16];
ICryptoTransform encryptor = twofish.CreateEncryptor(key, initializationVector);
ICryptoTransform decryptor = twofish.CreateDecryptor(key, initializationVector);
byte[] result1 = new byte[16];
byte[] result2 = new byte[16];
encryptor.TransformBlock(plaintext, 0, 16, result1, 0);
decryptor.TransformBlock(ciphertext, 0, 16, result2, 0);
return(ByteUtils.AreByteArraysEqual(result1, ciphertext) && ByteUtils.AreByteArraysEqual(result2, plaintext));
}
