public byte[] Decrypt(byte[] file)
{
Twofish fish = new Twofish();
fish.Mode = CipherMode.ECB;
byte[] dummy = { };
//create Twofish Decryptor from our twofish instance
ICryptoTransform decrypt = fish.CreateDecryptor(key, dummy);
System.IO.MemoryStream msD = new System.IO.MemoryStream();
//create crypto stream set to read and do a Twofish decryption transform on incoming bytes
CryptoStream cryptostreamDecr = new CryptoStream(msD, decrypt, CryptoStreamMode.Write);
//write out Twofish encrypted stream
cryptostreamDecr.Write(file, 0, file.Length);
cryptostreamDecr.Close();
byte[] buf = msD.GetBuffer();
// TODO: It might be pretty dangerous to cut on the size of the input buffer
// because of the padding some bytes might be added. However these bytes will
// be only zeros (External.Twofish uses Padding.Zero) so zeros should be OK.
Array.Resize(ref buf, file.Length);
// We can not remove any other padding bytes because we can not distinuish between
// bytes added by the crypto algo and bytes belonging to the original unecrtypted file.
return(buf);
}
public string Decrypt(string encrypted_str)
{
Twofish fish = new Twofish();
fish.Mode = CipherMode.ECB;
byte[] plainText = { };
//create Twofish Decryptor from our twofish instance
ICryptoTransform decrypt = fish.CreateDecryptor(key, plainText);
System.IO.MemoryStream msD = new System.IO.MemoryStream();
//create crypto stream set to read and do a Twofish decryption transform on incoming bytes
CryptoStream cryptostreamDecr = new CryptoStream(msD, decrypt, CryptoStreamMode.Write);
byte[] bytOut = GetBytes(encrypted_str);
//write out Twofish encrypted stream
cryptostreamDecr.Write(bytOut, 0, bytOut.Length);
cryptostreamDecr.Close();
byte[] bytOutD = msD.GetBuffer();
return(GetString(bytOutD));
}
public bool unpackStageTwo()
{
Twofish twofish = new Twofish()
{
Mode = System.Security.Cryptography.CipherMode.CBC,
Key = new byte[] { 0x89, 0x89, 0x89, 0x89, 0x89, 0x89, 0x89, 0x89, 0x89, 0x89, 0x89, 0x89, 0x89, 0x89, 0x89, 0x89 },
IV = new byte[] { 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10 }
};
ICryptoTransform decrypt = twofish.CreateDecryptor();
System.IO.MemoryStream msD = new System.IO.MemoryStream();
CryptoStream cryptostreamDecr = new CryptoStream(msD, decrypt, CryptoStreamMode.Write);
cryptostreamDecr.Write(this.Buffer, 0, this.Buffer.Length);
cryptostreamDecr.Close();
byte[] tmp = msD.GetBuffer();
Console.WriteLine(tmp.Length);
for (int i = 0; i < this.Buffer.Length; i++)
{
this.Buffer[i] = tmp[i];
}
return(true);
}
private static Stream CreateStream(Stream s, bool bEncrypt, byte[] pbKey, byte[] pbIV)
{
ValidateArguments(s, bEncrypt, pbKey, pbIV);
Twofish f = new Twofish();
byte[] pbLocalIV = new byte[16];
Array.Copy(pbIV, pbLocalIV, 16);
f.IV = pbLocalIV;
byte[] pbLocalKey = new byte[32];
Array.Copy(pbKey, pbLocalKey, 32);
f.KeySize = 256;
f.Key = pbLocalKey;
f.Mode = m_rCipherMode;
f.Padding = m_rCipherPadding;
ICryptoTransform iTransform = (bEncrypt ? f.CreateEncryptor() : f.CreateDecryptor());
Debug.Assert(iTransform != null);
if (iTransform == null)
{
throw new SecurityException("Unable to create Twofish transform!");
}
return(new CryptoStream(s, iTransform, bEncrypt ? CryptoStreamMode.Write :
CryptoStreamMode.Read));
}
public void decrypt(byte[] criptedData, byte[] destination)
{
tfDecryptor = tf.CreateDecryptor(tf.Key, tf.IV);
for (int i = 0; i < criptedData.Length / 16; i++)
{
tfDecryptor.TransformBlock(criptedData, i * 16, 16, destination, i * 16);
}
}
/// <summary>
/// Test the twofish cipher in ECB mode
/// </summary>
/// <param name="Key">The used to encrypt the data.</param>
/// <param name="plainText">The plain text.</param>
/// <param name="cryptText">The encrypted text to be used for comparison.</param>
static void TestTwofishCBC(ref byte[] Key, ref byte[] plainText, ref byte[] iv, ref byte[] cryptText)
{
Twofish fish = new Twofish();
fish.Mode = CipherMode.CBC;
System.IO.MemoryStream ms = new System.IO.MemoryStream();
//create Twofish Encryptor from this instance
ICryptoTransform encrypt = fish.CreateEncryptor(Key, iv); // we use the plainText as the IV as in ECB mode the IV is not used
//Create Crypto Stream that transforms file stream using twofish encryption
CryptoStream cryptostream = new CryptoStream(ms, encrypt, CryptoStreamMode.Write);
//write out Twofish encrypted stream
cryptostream.Write(plainText, 0, plainText.Length);
cryptostream.Close();
byte[] bytOut = ms.ToArray();
/*
* // check the first block only
*
* for (int i=0;i<cryptText.Length;i++)
* {
* if (bytOut[i] != cryptText[i])
* {
* Trace.Write("Cryptext match failure\n");
* break;
* }
* }
*/
//create Twofish Decryptor from our twofish instance
ICryptoTransform decrypt = fish.CreateDecryptor(Key, iv);
System.IO.MemoryStream msD = new System.IO.MemoryStream();
//create crypto stream set to read and do a Twofish decryption transform on incoming bytes
CryptoStream cryptostreamDecr = new CryptoStream(msD, decrypt, CryptoStreamMode.Write);
//write out Twofish encrypted stream
cryptostreamDecr.Write(bytOut, 0, bytOut.Length);
cryptostreamDecr.Close();
byte[] bytOutD = msD.GetBuffer();
// check
for (int i = 0; i < plainText.Length; i++)
{
if (bytOutD[i] != plainText[i])
{
Trace.Write("Plaintext match failure\n");
break;
}
}
}
static void Main(string[] args)
{
Console.OutputEncoding = Encoding.Unicode;
Twofish fish = new Twofish();
fish.Mode = CipherMode.ECB;
System.IO.MemoryStream ms = new System.IO.MemoryStream();
byte[] Key = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };
byte[] dummy = { };
//create Twofish Encryptor from this instance
ICryptoTransform encrypt = fish.CreateEncryptor(Key, dummy); // we use the plainText as the IV as in ECB mode the IV is not used
//Create Crypto Stream that transforms file stream using twofish encryption
CryptoStream cryptostream = new CryptoStream(ms, encrypt, CryptoStreamMode.Write);
byte[] plainText = GetBytes("Some string to encrypt");
//write out Twofish encrypted stream
cryptostream.Write(plainText, 0, plainText.Length);
cryptostream.Close();
byte[] bytOut = ms.ToArray();
System.Console.WriteLine("Encrypted string: " + GetString(bytOut));
//create Twofish Decryptor from our twofish instance
ICryptoTransform decrypt = fish.CreateDecryptor(Key, plainText);
System.IO.MemoryStream msD = new System.IO.MemoryStream();
//create crypto stream set to read and do a Twofish decryption transform on incoming bytes
CryptoStream cryptostreamDecr = new CryptoStream(msD, decrypt, CryptoStreamMode.Write);
//write out Twofish encrypted stream
cryptostreamDecr.Write(bytOut, 0, bytOut.Length);
cryptostreamDecr.Close();
byte[] bytOutD = msD.GetBuffer();
System.Console.WriteLine("Decrypted string: " + GetString(bytOutD));
Console.ReadKey();
}
public string shadow_decrypt(string encyptedText)
{
fish = new Twofish();
fish.Mode = CipherMode.ECB;
ms = new System.IO.MemoryStream();
//form.log("we were sent the IM with " + encyptedText);
byte[] encyptedBytes = Utils.StringToBytes(encyptedText);
ICryptoTransform decode = new FromBase64Transform();
//create DES Decryptor from our des instance
ICryptoTransform decrypt = fish.CreateDecryptor(form.getKey(), encyptedBytes);
System.IO.MemoryStream msD = new System.IO.MemoryStream();
CryptoStream cryptostreamDecode = new CryptoStream(new CryptoStream(msD, decrypt, CryptoStreamMode.Write), decode, CryptoStreamMode.Write);
cryptostreamDecode.Write(encyptedBytes, 0, encyptedBytes.Length);
cryptostreamDecode.Close();
byte[] bytOutD = msD.ToArray(); // we should now have our plain text back
form.log("We decrypted " + encyptedText + " to " + Utils.BytesToString(bytOutD), Color.Red);
return("" + this.indicator + "" + Utils.BytesToString(bytOutD));
}
/// <summary>
/// This encrypts our data using twofish and then converts to base64 and then reverses the process
/// </summary>
/// <param name="Key">The Key to use for the encryption stage</param>
/// <param name="plainText">The plain text to encrypt and encode and then to compare when it has been decoded and decrypted</param>
static void Cascade(ref byte[] Key, ref byte[] plainText)
{
Twofish fish = new Twofish();
fish.Mode = CipherMode.ECB;
System.IO.MemoryStream ms = new System.IO.MemoryStream();
// create an encoder
ICryptoTransform encode = new ToBase64Transform();
//create Twofish Encryptor from this instance
ICryptoTransform encrypt = fish.CreateEncryptor(Key, plainText); // we use the plainText as the IV as in ECB mode the IV is not used
// we have to work backwords defining the last link in the chain first
CryptoStream cryptostreamEncode = new CryptoStream(ms, encode, CryptoStreamMode.Write);
CryptoStream cryptostream = new CryptoStream(cryptostreamEncode, encrypt, CryptoStreamMode.Write);
// or we could do this as we don't need to use cryptostreamEncode
//CryptoStream cryptostream = new CryptoStream(new CryptoStream(ms,encode,CryptoStreamMode.Write),
// encrypt,CryptoStreamMode.Write);
cryptostream.Write(plainText, 0, plainText.Length);
cryptostream.Close();
//long pos = ms.Position; // our stream is closed so we cannot find out what the size of the buffer is - daft
byte[] bytOut = ms.ToArray();
// and now we undo what we did
// create a decoder
ICryptoTransform decode = new FromBase64Transform();
//create DES Decryptor from our des instance
ICryptoTransform decrypt = fish.CreateDecryptor(Key, plainText);
System.IO.MemoryStream msD = new System.IO.MemoryStream();
//create crypto stream set to read and do a Twofish decryption transform on incoming bytes
CryptoStream cryptostreamD = new CryptoStream(msD, decrypt, CryptoStreamMode.Write);
CryptoStream cryptostreamDecode = new CryptoStream(cryptostreamD, decode, CryptoStreamMode.Write);
// again we could do the following
//CryptoStream cryptostreamDecode = new CryptoStream(new CryptoStream(msD,decrypt,CryptoStreamMode.Write),
// decode,CryptoStreamMode.Write);
//write out the decrypted stream
cryptostreamDecode.Write(bytOut, 0, bytOut.Length);
cryptostreamDecode.Close();
byte[] bytOutD = msD.ToArray(); // we should now have our plain text back
for (int i = 0; i < plainText.Length; i++)
{
if (bytOutD[i] != plainText[i])
{
Trace.Write("Plaintext match failure");
break;
}
}
}