#region Header //Copyright 2011 Cloud Sidekick

#region Header

//Copyright 2011 Cloud Sidekick

//
//Licensed under the Apache License, Version 2.0 (the "License");
//you may not use this file except in compliance with the License.
//You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
//Unless required by applicable law or agreed to in writing, software
//distributed under the License is distributed on an "AS IS" BASIS,
//WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//See the License for the specific language governing permissions and
//limitations under the License.
//

#endregion Header

namespace Encryption

{
using System;
using System.Collections;
using System.Text;

public class Blowfish

{
#region Fields

byte[] key;

Mode mode = Mode.ECB;

#endregion Fields

#region Constructors

///

/// Purpose: To provide a fairly strong bi-directional encryption algorithm
///
/// BLOWFISH ENCRYPTION ALGORITHM
///
/// Encryption and Decryption of Byte Strings using the Blowfish Encryption Algorithm.
/// Blowfish is a block cipher that encrypts data in 8-byte blocks. The algorithm consists
/// of two parts: a key-expansion part and a data-ancryption part. Key expansion converts a
/// variable key of at least 1 and at most 56 bytes into several subkey arrays totaling
/// 4168 bytes. Blowfish has 16 rounds. Each round consists of a key-dependent permutation,
/// and a key and data-dependent substitution. All operations are XORs and additions on 32-bit words.
/// The only additional operations are four indexed array data lookups per round.
/// Blowfish uses a large number of subkeys. These keys must be precomputed before any data
/// encryption or decryption. The P-array consists of 18 32-bit subkeys: P0, P1,...,P17.
/// There are also four 32-bit S-boxes with 256 entries each: S0,0, S0,1,...,S0,255;
/// S1,0, S1,1,...,S1,255; S2,0, S2,1,...,S2,255; S3,0, S3,1,...,S3,255;
///
/// Sample C code downloadable from: http://www.schneier.com/blowfish-download.html
///
///

///

/// Purpose: To create an instance of the Blowfish class that will use the specified key
///

///

public Blowfish(string key)

{
if (key == null || key.Length == 0)
throw new ArgumentNullException("key", "key must be a valid string");

this.key = Encoding.ASCII.GetBytes(key.ToCharArray());

mode = Mode.ECB;
}

#endregion Constructors

#region Enumerations

///

/// This specifies the desired block handling method for the encryption algoritm. The default is EBC
///

public enum Mode
{
///

/// In ECB mode if the same block is encrypted twice with the same key, the resulting ciphertext blocks are the same.
///

ECB = 0,
///

/// In CBC Mode a ciphertext block is obtained by first xoring the plaintext block with the previous ciphertext block, and encrypting the resulting value.
///

CBC = 1
}

#endregion Enumerations

#region Methods

public static string DecryptFromBase64(string key, string inString)

{
Blowfish blowfish = new Blowfish(key);
return blowfish.DecryptBytes(inString);
}

public static string EncryptToBase64(string key, string inString)

{
Blowfish blowfish = new Blowfish(key);
return blowfish.EncryptBytes(inString);
}

///

/// Purpose: To decrypt an encrypted buffer and place the output into a string
/// Note: This function assumes the originally encrypted data was a human-readable string
///

///

///

public string Decrypt(byte[] inBuffer)
{
int internalBufferSize = inBuffer.Length;
if (internalBufferSize % 8 != 0)
internalBufferSize += (8 - (internalBufferSize % 8));
byte[] internalBuffer = DecryptBuffer(inBuffer);
return System.Convert.ToBase64String(internalBuffer);
}

///

/// Purpose: To decrypt an encrypted buffer using the specified mode
///

///

///

///
public byte[] DecryptBuffer(byte[] inBuffer)
{
int internalBufferSize = inBuffer.Length;
if (internalBufferSize % 8 != 0)
internalBufferSize += (8 - (internalBufferSize % 8));
byte[] internalBuffer = new byte[internalBufferSize];
inBuffer.CopyTo(internalBuffer, 0);
byte[] outBuffer = new byte[internalBufferSize];
switch (mode)
{
case Mode.CBC:
BlowfishCBC bfCBC = new BlowfishCBC(key);
bfCBC.Decrypt(inBuffer, 0, outBuffer, 0, inBuffer.Length);
break;
case Mode.ECB:
BlowfishECB bfECB = new BlowfishECB(key);
bfECB.Decrypt(inBuffer, 0, outBuffer, 0, inBuffer.Length);
break;
}
return outBuffer;
}

///

/// Purpose: To decrypt a base64 string that was previously encoded using the EncryptBase64 function.
///

///

///

public string DecryptBytes(string base64String)
{
try
{
byte[] encryptedData = System.Convert.FromBase64String(base64String);
byte[] decryptedData = DecryptBuffer(encryptedData);
string ret = System.Text.Encoding.ASCII.GetString(decryptedData, 0, decryptedData.Length);
// Now strip of any trailing nulls
if (ret.Length > 0)
{
for (int i = ret.Length - 1; i >= 0; i--)
{
if (ret[i] != '\0' && ret[i] > 17)
{
if (i < ret.Length - 1)
ret = ret.Substring(0, i + 1);
break;
}
}
}
return ret;
}
catch
{
return "";
}
}

///

/// Purpose: To Encrypt a string. The output is a raw byte buffer
///

///

///

public byte[] Encrypt(string inString)
{
byte[] byteArray = Encoding.ASCII.GetBytes(inString.ToCharArray());
return EncryptBuffer(byteArray);
}

///

/// Purpose: To encrypt a raw byte buffer using the specified mode. The output is a raw byte buffer
///

///

///

///
public byte[] EncryptBuffer(byte[] inBuffer)
{
int inBufferSize = inBuffer.Length;
if (inBufferSize == 0)
return new byte[0];
// Since this is a block cypher algorithm, we have to encrypt full blocks of data so we
// have to create a new buffer that is an even block size
byte pad = 0;
if (inBufferSize % 8 != 0)
pad = (byte)(8 - (inBufferSize % 8));
else
pad = 8;
int internalBufferSize = inBufferSize + pad;
byte[] internalBuffer = new byte[internalBufferSize];
// Set the pad bytes to the appropriate value
for (int i = inBufferSize; i < internalBufferSize; i++)
internalBuffer[i] = pad;

byte[] outBuffer = new byte[internalBufferSize];

inBuffer.CopyTo(internalBuffer, 0);

//Check the buffer's length - should be > 0 and multiple of 8

if ((internalBufferSize != 0) && (internalBufferSize % 8 == 0))
{
switch (mode)
{
case Mode.CBC:
BlowfishCBC bfCBC = new BlowfishCBC(key);
bfCBC.Encrypt(internalBuffer, 0, outBuffer, 0, internalBuffer.Length);
break;
case Mode.ECB:
BlowfishECB bfECB = new BlowfishECB(key);
bfECB.Encrypt(internalBuffer, 0, outBuffer, 0, internalBuffer.Length);
break;
}
}
return outBuffer;
}

public string EncryptBytes(string inString)

{
byte[] encryptedData = Encrypt(inString);
return System.Convert.ToBase64String(encryptedData);
}

#endregion Methods

}

///

/// Blowfish CBC implementation.
///

///
/// Use this class to encrypt or decrypt byte arrays or a single blocks
/// with Blowfish in CBC (Cipher Block Block Chaining) mode. This is the
/// recommended way to use Blowfish.NET, unless certain requirements
/// (e.g. moving block without decryption) exist.
///
public class BlowfishCBC : BlowfishECB
{
#region Fields

// (we store the IV as two 32bit integers, to void packing and

// unpacking inbetween the handling of data chunks)
uint m_ivHi;
uint m_ivLo;

#endregion Fields

#region Constructors

//////////////////////////////////////////////////////////////////////

public BlowfishCBC(string key)
: base(null, 0, 0)
{
byte[] localKey = Encoding.Convert(Encoding.Unicode, Encoding.ASCII, Encoding.Unicode.GetBytes(key));
Initialize(localKey, 0, 0);
}

public BlowfishCBC(byte[] key)

: base(key, 0, 0)
{
}

///

/// Default constructor. The IV needs to be assigned after the
/// instance has been created.
///

///
public BlowfishCBC(byte[] key, int nOfs, int nLen)
: base(key, nOfs, nLen)
{
}

//////////////////////////////////////////////////////////////////////

///

/// Zero key constructor, call Initialize() to get a properly set up
/// instance, then apply the IV.
///

public BlowfishCBC()
: base(null, 0, 0)
{
}

#endregion Constructors

#region Properties

//////////////////////////////////////////////////////////////////////

///

/// The current initialization vector (IV), which measures one
/// block. Property for convient read and writes.
///

public byte[] IV
{
set
{
SetIV(value, 0);
}

get
{

byte[] result = new byte[BLOCK_SIZE];
GetIV(result, 0);
return result;
}
}

#endregion Properties

#region Methods

//////////////////////////////////////////////////////////////////////

///
public new object Clone()
{
BlowfishCBC result;

result = new BlowfishCBC();

result.m_pbox = (uint[])this.m_pbox.Clone();

result.m_sbox1 = (uint[])this.m_sbox1.Clone();

result.m_sbox2 = (uint[])this.m_sbox2.Clone();
result.m_sbox3 = (uint[])this.m_sbox3.Clone();
result.m_sbox4 = (uint[])this.m_sbox4.Clone();

result.m_block = (byte[])this.m_block.Clone();

result.m_nIsWeakKey = this.m_nIsWeakKey;

result.m_ivHi = this.m_ivHi;

result.m_ivLo = this.m_ivLo;

return result;

}

//////////////////////////////////////////////////////////////////////

///
public new int Decrypt(
byte[] dataIn,
int nPosIn,
byte[] dataOut,
int nPosOut,
int nCount)
{
int nEnd;
uint unHi, unLo, unHiBak, unLoBak;

uint[] sbox1 = m_sbox1;

uint[] sbox2 = m_sbox2;
uint[] sbox3 = m_sbox3;
uint[] sbox4 = m_sbox4;

uint[] pbox = m_pbox;

uint pbox00 = pbox[0];

uint pbox01 = pbox[1];
uint pbox02 = pbox[2];
uint pbox03 = pbox[3];
uint pbox04 = pbox[4];
uint pbox05 = pbox[5];
uint pbox06 = pbox[6];
uint pbox07 = pbox[7];
uint pbox08 = pbox[8];
uint pbox09 = pbox[9];
uint pbox10 = pbox[10];
uint pbox11 = pbox[11];
uint pbox12 = pbox[12];
uint pbox13 = pbox[13];
uint pbox14 = pbox[14];
uint pbox15 = pbox[15];
uint pbox16 = pbox[16];
uint pbox17 = pbox[17];

uint ivHi = m_ivHi;

uint ivLo = m_ivLo;

nCount &= ~(BLOCK_SIZE - 1);

nEnd = nPosIn + nCount;

while (nPosIn < nEnd)

{
unHi = unHiBak = (((uint)dataIn[nPosIn]) << 24) |
(((uint)dataIn[nPosIn + 1]) << 16) |
(((uint)dataIn[nPosIn + 2]) << 8) |
dataIn[nPosIn + 3];

unLo = unLoBak = (((uint)dataIn[nPosIn + 4]) << 24) |

(((uint)dataIn[nPosIn + 5]) << 16) |
(((uint)dataIn[nPosIn + 6]) << 8) |
dataIn[nPosIn + 7];
nPosIn += 8;

unHi ^= pbox17;

unLo ^= (((sbox1[(int)(unHi >> 24)] + sbox2[(int)((unHi >> 16) & 0x0ff)]) ^ sbox3[(int)((unHi >> 8) & 0x0ff)]) + sbox4[(int)(unHi & 0x0ff)]) ^ pbox16;
unHi ^= (((sbox1[(int)(unLo >> 24)] + sbox2[(int)((unLo >> 16) & 0x0ff)]) ^ sbox3[(int)((unLo >> 8) & 0x0ff)]) + sbox4[(int)(unLo & 0x0ff)]) ^ pbox15;
unLo ^= (((sbox1[(int)(unHi >> 24)] + sbox2[(int)((unHi >> 16) & 0x0ff)]) ^ sbox3[(int)((unHi >> 8) & 0x0ff)]) + sbox4[(int)(unHi & 0x0ff)]) ^ pbox14;
unHi ^= (((sbox1[(int)(unLo >> 24)] + sbox2[(int)((unLo >> 16) & 0x0ff)]) ^ sbox3[(int)((unLo >> 8) & 0x0ff)]) + sbox4[(int)(unLo & 0x0ff)]) ^ pbox13;
unLo ^= (((sbox1[(int)(unHi >> 24)] + sbox2[(int)((unHi >> 16) & 0x0ff)]) ^ sbox3[(int)((unHi >> 8) & 0x0ff)]) + sbox4[(int)(unHi & 0x0ff)]) ^ pbox12;
unHi ^= (((sbox1[(int)(unLo >> 24)] + sbox2[(int)((unLo >> 16) & 0x0ff)]) ^ sbox3[(int)((unLo >> 8) & 0x0ff)]) + sbox4[(int)(unLo & 0x0ff)]) ^ pbox11;
unLo ^= (((sbox1[(int)(unHi >> 24)] + sbox2[(int)((unHi >> 16) & 0x0ff)]) ^ sbox3[(int)((unHi >> 8) & 0x0ff)]) + sbox4[(int)(unHi & 0x0ff)]) ^ pbox10;
unHi ^= (((sbox1[(int)(unLo >> 24)] + sbox2[(int)((unLo >> 16) & 0x0ff)]) ^ sbox3[(int)((unLo >> 8) & 0x0ff)]) + sbox4[(int)(unLo & 0x0ff)]) ^ pbox09;
unLo ^= (((sbox1[(int)(unHi >> 24)] + sbox2[(int)((unHi >> 16) & 0x0ff)]) ^ sbox3[(int)((unHi >> 8) & 0x0ff)]) + sbox4[(int)(unHi & 0x0ff)]) ^ pbox08;
unHi ^= (((sbox1[(int)(unLo >> 24)] + sbox2[(int)((unLo >> 16) & 0x0ff)]) ^ sbox3[(int)((unLo >> 8) & 0x0ff)]) + sbox4[(int)(unLo & 0x0ff)]) ^ pbox07;
unLo ^= (((sbox1[(int)(unHi >> 24)] + sbox2[(int)((unHi >> 16) & 0x0ff)]) ^ sbox3[(int)((unHi >> 8) & 0x0ff)]) + sbox4[(int)(unHi & 0x0ff)]) ^ pbox06;
unHi ^= (((sbox1[(int)(unLo >> 24)] + sbox2[(int)((unLo >> 16) & 0x0ff)]) ^ sbox3[(int)((unLo >> 8) & 0x0ff)]) + sbox4[(int)(unLo & 0x0ff)]) ^ pbox05;
unLo ^= (((sbox1[(int)(unHi >> 24)] + sbox2[(int)((unHi >> 16) & 0x0ff)]) ^ sbox3[(int)((unHi >> 8) & 0x0ff)]) + sbox4[(int)(unHi & 0x0ff)]) ^ pbox04;
unHi ^= (((sbox1[(int)(unLo >> 24)] + sbox2[(int)((unLo >> 16) & 0x0ff)]) ^ sbox3[(int)((unLo >> 8) & 0x0ff)]) + sbox4[(int)(unLo & 0x0ff)]) ^ pbox03;
unLo ^= (((sbox1[(int)(unHi >> 24)] + sbox2[(int)((unHi >> 16) & 0x0ff)]) ^ sbox3[(int)((unHi >> 8) & 0x0ff)]) + sbox4[(int)(unHi & 0x0ff)]) ^ pbox02;
unHi ^= (((sbox1[(int)(unLo >> 24)] + sbox2[(int)((unLo >> 16) & 0x0ff)]) ^ sbox3[(int)((unLo >> 8) & 0x0ff)]) + sbox4[(int)(unLo & 0x0ff)]) ^ pbox01;

unLo ^= ivHi ^ pbox00;

unHi ^= ivLo;

dataOut[nPosOut] = (byte)(unLo >> 24);

dataOut[nPosOut + 1] = (byte)(unLo >> 16);
dataOut[nPosOut + 2] = (byte)(unLo >> 8);
dataOut[nPosOut + 3] = (byte)unLo;

dataOut[nPosOut + 4] = (byte)(unHi >> 24);

dataOut[nPosOut + 5] = (byte)(unHi >> 16);
dataOut[nPosOut + 6] = (byte)(unHi >> 8);
dataOut[nPosOut + 7] = (byte)unHi;

ivHi = unHiBak;

ivLo = unLoBak;

nPosOut += 8;

}

m_ivHi = ivHi;

m_ivLo = ivLo;

return nCount;

}

//////////////////////////////////////////////////////////////////////

///
public new void DecryptBlock(
uint unHi,
uint unLo,
out uint unOutHi,
out uint unOutLo)
{
byte[] block;

block = m_block;

block[0] = (byte)(unHi >> 24);

block[1] = (byte)(unHi >> 16);
block[2] = (byte)(unHi >> 8);
block[3] = (byte)unHi;
block[4] = (byte)(unLo >> 24);
block[5] = (byte)(unLo >> 16);
block[6] = (byte)(unLo >> 8);
block[7] = (byte)unLo;

Decrypt(block, 0, block, 0, BLOCK_SIZE);

unOutHi = (((uint)block[0]) << 24) |

(((uint)block[1]) << 16) |
(((uint)block[2]) << 8) |
block[3];

unOutLo = (((uint)block[4]) << 24) |

(((uint)block[5]) << 16) |
(((uint)block[6]) << 8) |
block[7];
}

//////////////////////////////////////////////////////////////////////

///
public new int Encrypt(
byte[] dataIn,
int nPosIn,
byte[] dataOut,
int nPosOut,
int nCount)
{
int nEnd;
uint unSwap;

uint[] sbox1 = m_sbox1;

uint[] sbox2 = m_sbox2;
uint[] sbox3 = m_sbox3;
uint[] sbox4 = m_sbox4;

uint[] pbox = m_pbox;

uint pbox00 = pbox[0];

uint pbox01 = pbox[1];
uint pbox02 = pbox[2];
uint pbox03 = pbox[3];
uint pbox04 = pbox[4];
uint pbox05 = pbox[5];
uint pbox06 = pbox[6];
uint pbox07 = pbox[7];
uint pbox08 = pbox[8];
uint pbox09 = pbox[9];
uint pbox10 = pbox[10];
uint pbox11 = pbox[11];
uint pbox12 = pbox[12];
uint pbox13 = pbox[13];
uint pbox14 = pbox[14];
uint pbox15 = pbox[15];
uint pbox16 = pbox[16];
uint pbox17 = pbox[17];

// (a little, but nifty trick: we don't need an extra IV pair, but

// we use the local block cache in reversed order)
uint unHi = m_ivHi;
uint unLo = m_ivLo;

nCount &= ~(BLOCK_SIZE - 1);

nEnd = nPosIn + nCount;

while (nPosIn < nEnd)

{
unHi ^= (((uint)dataIn[nPosIn]) << 24) |
(((uint)dataIn[nPosIn + 1]) << 16) |
(((uint)dataIn[nPosIn + 2]) << 8) |
dataIn[nPosIn + 3];

unLo ^= (((uint)dataIn[nPosIn + 4]) << 24) |

(((uint)dataIn[nPosIn + 5]) << 16) |
(((uint)dataIn[nPosIn + 6]) << 8) |
dataIn[nPosIn + 7];

nPosIn += 8;

unHi ^= pbox00;

unLo ^= (((sbox1[(int)(unHi >> 24)] + sbox2[(int)((unHi >> 16) & 0x0ff)]) ^ sbox3[(int)((unHi >> 8) & 0x0ff)]) + sbox4[(int)(unHi & 0x0ff)]) ^ pbox01;
unHi ^= (((sbox1[(int)(unLo >> 24)] + sbox2[(int)((unLo >> 16) & 0x0ff)]) ^ sbox3[(int)((unLo >> 8) & 0x0ff)]) + sbox4[(int)(unLo & 0x0ff)]) ^ pbox02;
unLo ^= (((sbox1[(int)(unHi >> 24)] + sbox2[(int)((unHi >> 16) & 0x0ff)]) ^ sbox3[(int)((unHi >> 8) & 0x0ff)]) + sbox4[(int)(unHi & 0x0ff)]) ^ pbox03;
unHi ^= (((sbox1[(int)(unLo >> 24)] + sbox2[(int)((unLo >> 16) & 0x0ff)]) ^ sbox3[(int)((unLo >> 8) & 0x0ff)]) + sbox4[(int)(unLo & 0x0ff)]) ^ pbox04;
unLo ^= (((sbox1[(int)(unHi >> 24)] + sbox2[(int)((unHi >> 16) & 0x0ff)]) ^ sbox3[(int)((unHi >> 8) & 0x0ff)]) + sbox4[(int)(unHi & 0x0ff)]) ^ pbox05;
unHi ^= (((sbox1[(int)(unLo >> 24)] + sbox2[(int)((unLo >> 16) & 0x0ff)]) ^ sbox3[(int)((unLo >> 8) & 0x0ff)]) + sbox4[(int)(unLo & 0x0ff)]) ^ pbox06;
unLo ^= (((sbox1[(int)(unHi >> 24)] + sbox2[(int)((unHi >> 16) & 0x0ff)]) ^ sbox3[(int)((unHi >> 8) & 0x0ff)]) + sbox4[(int)(unHi & 0x0ff)]) ^ pbox07;
unHi ^= (((sbox1[(int)(unLo >> 24)] + sbox2[(int)((unLo >> 16) & 0x0ff)]) ^ sbox3[(int)((unLo >> 8) & 0x0ff)]) + sbox4[(int)(unLo & 0x0ff)]) ^ pbox08;
unLo ^= (((sbox1[(int)(unHi >> 24)] + sbox2[(int)((unHi >> 16) & 0x0ff)]) ^ sbox3[(int)((unHi >> 8) & 0x0ff)]) + sbox4[(int)(unHi & 0x0ff)]) ^ pbox09;
unHi ^= (((sbox1[(int)(unLo >> 24)] + sbox2[(int)((unLo >> 16) & 0x0ff)]) ^ sbox3[(int)((unLo >> 8) & 0x0ff)]) + sbox4[(int)(unLo & 0x0ff)]) ^ pbox10;
unLo ^= (((sbox1[(int)(unHi >> 24)] + sbox2[(int)((unHi >> 16) & 0x0ff)]) ^ sbox3[(int)((unHi >> 8) & 0x0ff)]) + sbox4[(int)(unHi & 0x0ff)]) ^ pbox11;
unHi ^= (((sbox1[(int)(unLo >> 24)] + sbox2[(int)((unLo >> 16) & 0x0ff)]) ^ sbox3[(int)((unLo >> 8) & 0x0ff)]) + sbox4[(int)(unLo & 0x0ff)]) ^ pbox12;
unLo ^= (((sbox1[(int)(unHi >> 24)] + sbox2[(int)((unHi >> 16) & 0x0ff)]) ^ sbox3[(int)((unHi >> 8) & 0x0ff)]) + sbox4[(int)(unHi & 0x0ff)]) ^ pbox13;
unHi ^= (((sbox1[(int)(unLo >> 24)] + sbox2[(int)((unLo >> 16) & 0x0ff)]) ^ sbox3[(int)((unLo >> 8) & 0x0ff)]) + sbox4[(int)(unLo & 0x0ff)]) ^ pbox14;
unLo ^= (((sbox1[(int)(unHi >> 24)] + sbox2[(int)((unHi >> 16) & 0x0ff)]) ^ sbox3[(int)((unHi >> 8) & 0x0ff)]) + sbox4[(int)(unHi & 0x0ff)]) ^ pbox15;
unHi ^= (((sbox1[(int)(unLo >> 24)] + sbox2[(int)((unLo >> 16) & 0x0ff)]) ^ sbox3[(int)((unLo >> 8) & 0x0ff)]) + sbox4[(int)(unLo & 0x0ff)]) ^ pbox16;

// ... which makes this swap necessary

unSwap = unLo ^ pbox17;
unLo = unHi;
unHi = unSwap;

dataOut[nPosOut] = (byte)(unHi >> 24);

dataOut[nPosOut + 1] = (byte)(unHi >> 16);
dataOut[nPosOut + 2] = (byte)(unHi >> 8);
dataOut[nPosOut + 3] = (byte)unHi;

dataOut[nPosOut + 4] = (byte)(unLo >> 24);

dataOut[nPosOut + 5] = (byte)(unLo >> 16);
dataOut[nPosOut + 6] = (byte)(unLo >> 8);
dataOut[nPosOut + 7] = (byte)unLo;

nPosOut += 8;

}

m_ivHi = unHi;

m_ivLo = unLo;

return nCount;

}

//////////////////////////////////////////////////////////////////////

///
public new void EncryptBlock(
uint unHi,
uint unLo,
out uint unOutHi,
out uint unOutLo)
{
byte[] block;
block = m_block;

block[0] = (byte)(unHi >> 24);

block[1] = (byte)(unHi >> 16);
block[2] = (byte)(unHi >> 8);
block[3] = (byte)unHi;
block[4] = (byte)(unLo >> 24);
block[5] = (byte)(unLo >> 16);
block[6] = (byte)(unLo >> 8);
block[7] = (byte)unLo;

Encrypt(block, 0, block, 0, BLOCK_SIZE);

unOutHi = (((uint)block[0]) << 24) |

(((uint)block[1]) << 16) |
(((uint)block[2]) << 8) |
block[3];

unOutLo = (((uint)block[4]) << 24) |

(((uint)block[5]) << 16) |
(((uint)block[6]) << 8) |
block[7];
}

///

/// Gets the current IV material (of the size of one block).
///

///
buffer to copy the IV to

///
where to start copying

public void GetIV(
byte[] buf,
int nOfs)
{
uint ivHi = m_ivHi;
uint ivLo = m_ivLo;

buf[nOfs++] = (byte)(ivHi >> 24);

buf[nOfs++] = (byte)(ivHi >> 16);
buf[nOfs++] = (byte)(ivHi >> 8);
buf[nOfs++] = (byte)ivHi;

buf[nOfs++] = (byte)(ivLo >> 24);

buf[nOfs++] = (byte)(ivLo >> 16);
buf[nOfs++] = (byte)(ivLo >> 8);
buf[nOfs] = (byte)ivLo;
}

//////////////////////////////////////////////////////////////////////

///
public new void Invalidate()
{
base.Invalidate();

m_ivHi = m_ivLo = 0;

}

//////////////////////////////////////////////////////////////////////

///

/// Sets the initialization vector (IV).
///

///
buffer containing the new IV material

///
where the IV material starts

public void SetIV(
byte[] buf,
int nOfs)
{
m_ivHi = (((uint)buf[nOfs]) << 24) |
(((uint)buf[nOfs + 1]) << 16) |
(((uint)buf[nOfs + 2]) << 8) |
buf[nOfs + 3];

m_ivLo = (((uint)buf[nOfs + 4]) << 24) |

(((uint)buf[nOfs + 5]) << 16) |
(((uint)buf[nOfs + 6]) << 8) |
buf[nOfs + 7];
}

#endregion Methods

}

///

/// Blowfish ECB implementation.
///

///
/// Use this class to encrypt or decrypt byte arrays or a single
/// block with Blowfish in the ECB (Electronic Code Book) mode,
/// they key length can be flexible from zero up to 56 bytes.
///
public class BlowfishECB : ICloneable
{
#region Fields

///

/// Block size in bytes.
///

public const int BLOCK_SIZE = 8;

///

/// Maximum (and recommended) key size in bytes.
///

public const int MAX_KEY_LENGTH = 56;

//////////////////////////////////////////////////////////////////////

public static readonly uint[] PBOX_INIT =
{

0x243f6a88, 0x85a308d3, 0x13198a2e, 0x03707344, 0xa4093822, 0x299f31d0,

0x082efa98, 0xec4e6c89, 0x452821e6, 0x38d01377, 0xbe5466cf, 0x34e90c6c,
0xc0ac29b7, 0xc97c50dd, 0x3f84d5b5, 0xb5470917, 0x9216d5d9, 0x8979fb1b
};
public static readonly uint[] SBOX_INIT_1 =
{

0xd1310ba6, 0x98dfb5ac, 0x2ffd72db, 0xd01adfb7, 0xb8e1afed, 0x6a267e96,

0xba7c9045, 0xf12c7f99, 0x24a19947, 0xb3916cf7, 0x0801f2e2, 0x858efc16,
0x636920d8, 0x71574e69, 0xa458fea3, 0xf4933d7e, 0x0d95748f, 0x728eb658,
0x718bcd58, 0x82154aee, 0x7b54a41d, 0xc25a59b5, 0x9c30d539, 0x2af26013,
0xc5d1b023, 0x286085f0, 0xca417918, 0xb8db38ef, 0x8e79dcb0, 0x603a180e,
0x6c9e0e8b, 0xb01e8a3e, 0xd71577c1, 0xbd314b27, 0x78af2fda, 0x55605c60,
0xe65525f3, 0xaa55ab94, 0x57489862, 0x63e81440, 0x55ca396a, 0x2aab10b6,
0xb4cc5c34, 0x1141e8ce, 0xa15486af, 0x7c72e993, 0xb3ee1411, 0x636fbc2a,
0x2ba9c55d, 0x741831f6, 0xce5c3e16, 0x9b87931e, 0xafd6ba33, 0x6c24cf5c,
0x7a325381, 0x28958677, 0x3b8f4898, 0x6b4bb9af, 0xc4bfe81b, 0x66282193,
0x61d809cc, 0xfb21a991, 0x487cac60, 0x5dec8032, 0xef845d5d, 0xe98575b1,
0xdc262302, 0xeb651b88, 0x23893e81, 0xd396acc5, 0x0f6d6ff3, 0x83f44239,
0x2e0b4482, 0xa4842004, 0x69c8f04a, 0x9e1f9b5e, 0x21c66842, 0xf6e96c9a,
0x670c9c61, 0xabd388f0, 0x6a51a0d2, 0xd8542f68, 0x960fa728, 0xab5133a3,
0x6eef0b6c, 0x137a3be4, 0xba3bf050, 0x7efb2a98, 0xa1f1651d, 0x39af0176,
0x66ca593e, 0x82430e88, 0x8cee8619, 0x456f9fb4, 0x7d84a5c3, 0x3b8b5ebe,
0xe06f75d8, 0x85c12073, 0x401a449f, 0x56c16aa6, 0x4ed3aa62, 0x363f7706,
0x1bfedf72, 0x429b023d, 0x37d0d724, 0xd00a1248, 0xdb0fead3, 0x49f1c09b,
0x075372c9, 0x80991b7b, 0x25d479d8, 0xf6e8def7, 0xe3fe501a, 0xb6794c3b,
0x976ce0bd, 0x04c006ba, 0xc1a94fb6, 0x409f60c4, 0x5e5c9ec2, 0x196a2463,
0x68fb6faf, 0x3e6c53b5, 0x1339b2eb, 0x3b52ec6f, 0x6dfc511f, 0x9b30952c,
0xcc814544, 0xaf5ebd09, 0xbee3d004, 0xde334afd, 0x660f2807, 0x192e4bb3,
0xc0cba857, 0x45c8740f, 0xd20b5f39, 0xb9d3fbdb, 0x5579c0bd, 0x1a60320a,
0xd6a100c6, 0x402c7279, 0x679f25fe, 0xfb1fa3cc, 0x8ea5e9f8, 0xdb3222f8,
0x3c7516df, 0xfd616b15, 0x2f501ec8, 0xad0552ab, 0x323db5fa, 0xfd238760,
0x53317b48, 0x3e00df82, 0x9e5c57bb, 0xca6f8ca0, 0x1a87562e, 0xdf1769db,
0xd542a8f6, 0x287effc3, 0xac6732c6, 0x8c4f5573, 0x695b27b0, 0xbbca58c8,
0xe1ffa35d, 0xb8f011a0, 0x10fa3d98, 0xfd2183b8, 0x4afcb56c, 0x2dd1d35b,
0x9a53e479, 0xb6f84565, 0xd28e49bc, 0x4bfb9790, 0xe1ddf2da, 0xa4cb7e33,
0x62fb1341, 0xcee4c6e8, 0xef20cada, 0x36774c01, 0xd07e9efe, 0x2bf11fb4,
0x95dbda4d, 0xae909198, 0xeaad8e71, 0x6b93d5a0, 0xd08ed1d0, 0xafc725e0,
0x8e3c5b2f, 0x8e7594b7, 0x8ff6e2fb, 0xf2122b64, 0x8888b812, 0x900df01c,
0x4fad5ea0, 0x688fc31c, 0xd1cff191, 0xb3a8c1ad, 0x2f2f2218, 0xbe0e1777,
0xea752dfe, 0x8b021fa1, 0xe5a0cc0f, 0xb56f74e8, 0x18acf3d6, 0xce89e299,
0xb4a84fe0, 0xfd13e0b7, 0x7cc43b81, 0xd2ada8d9, 0x165fa266, 0x80957705,
0x93cc7314, 0x211a1477, 0xe6ad2065, 0x77b5fa86, 0xc75442f5, 0xfb9d35cf,
0xebcdaf0c, 0x7b3e89a0, 0xd6411bd3, 0xae1e7e49, 0x00250e2d, 0x2071b35e,
0x226800bb, 0x57b8e0af, 0x2464369b, 0xf009b91e, 0x5563911d, 0x59dfa6aa,
0x78c14389, 0xd95a537f, 0x207d5ba2, 0x02e5b9c5, 0x83260376, 0x6295cfa9,
0x11c81968, 0x4e734a41, 0xb3472dca, 0x7b14a94a, 0x1b510052, 0x9a532915,
0xd60f573f, 0xbc9bc6e4, 0x2b60a476, 0x81e67400, 0x08ba6fb5, 0x571be91f,
0xf296ec6b, 0x2a0dd915, 0xb6636521, 0xe7b9f9b6, 0xff34052e, 0xc5855664,
0x53b02d5d, 0xa99f8fa1, 0x08ba4799, 0x6e85076a
};
public static readonly uint[] SBOX_INIT_2 =
{

0x4b7a70e9, 0xb5b32944,

0xdb75092e, 0xc4192623, 0xad6ea6b0, 0x49a7df7d, 0x9cee60b8, 0x8fedb266,
0xecaa8c71, 0x699a17ff, 0x5664526c, 0xc2b19ee1, 0x193602a5, 0x75094c29,
0xa0591340, 0xe4183a3e, 0x3f54989a, 0x5b429d65, 0x6b8fe4d6, 0x99f73fd6,
0xa1d29c07, 0xefe830f5, 0x4d2d38e6, 0xf0255dc1, 0x4cdd2086, 0x8470eb26,
0x6382e9c6, 0x021ecc5e, 0x09686b3f, 0x3ebaefc9, 0x3c971814, 0x6b6a70a1,
0x687f3584, 0x52a0e286, 0xb79c5305, 0xaa500737, 0x3e07841c, 0x7fdeae5c,
0x8e7d44ec, 0x5716f2b8, 0xb03ada37, 0xf0500c0d, 0xf01c1f04, 0x0200b3ff,
0xae0cf51a, 0x3cb574b2, 0x25837a58, 0xdc0921bd, 0xd19113f9, 0x7ca92ff6,
0x94324773, 0x22f54701, 0x3ae5e581, 0x37c2dadc, 0xc8b57634, 0x9af3dda7,
0xa9446146, 0x0fd0030e, 0xecc8c73e, 0xa4751e41, 0xe238cd99, 0x3bea0e2f,
0x3280bba1, 0x183eb331, 0x4e548b38, 0x4f6db908, 0x6f420d03, 0xf60a04bf,
0x2cb81290, 0x24977c79, 0x5679b072, 0xbcaf89af, 0xde9a771f, 0xd9930810,
0xb38bae12, 0xdccf3f2e, 0x5512721f, 0x2e6b7124, 0x501adde6, 0x9f84cd87,
0x7a584718, 0x7408da17, 0xbc9f9abc, 0xe94b7d8c, 0xec7aec3a, 0xdb851dfa,
0x63094366, 0xc464c3d2, 0xef1c1847, 0x3215d908, 0xdd433b37, 0x24c2ba16,
0x12a14d43, 0x2a65c451, 0x50940002, 0x133ae4dd, 0x71dff89e, 0x10314e55,
0x81ac77d6, 0x5f11199b, 0x043556f1, 0xd7a3c76b, 0x3c11183b, 0x5924a509,
0xf28fe6ed, 0x97f1fbfa, 0x9ebabf2c, 0x1e153c6e, 0x86e34570, 0xeae96fb1,
0x860e5e0a, 0x5a3e2ab3, 0x771fe71c, 0x4e3d06fa, 0x2965dcb9, 0x99e71d0f,
0x803e89d6, 0x5266c825, 0x2e4cc978, 0x9c10b36a, 0xc6150eba, 0x94e2ea78,
0xa5fc3c53, 0x1e0a2df4, 0xf2f74ea7, 0x361d2b3d, 0x1939260f, 0x19c27960,
0x5223a708, 0xf71312b6, 0xebadfe6e, 0xeac31f66, 0xe3bc4595, 0xa67bc883,
0xb17f37d1, 0x018cff28, 0xc332ddef, 0xbe6c5aa5, 0x65582185, 0x68ab9802,
0xeecea50f, 0xdb2f953b, 0x2aef7dad, 0x5b6e2f84, 0x1521b628, 0x29076170,
0xecdd4775, 0x619f1510, 0x13cca830, 0xeb61bd96, 0x0334fe1e, 0xaa0363cf,
0xb5735c90, 0x4c70a239, 0xd59e9e0b, 0xcbaade14, 0xeecc86bc, 0x60622ca7,
0x9cab5cab, 0xb2f3846e, 0x648b1eaf, 0x19bdf0ca, 0xa02369b9, 0x655abb50,
0x40685a32, 0x3c2ab4b3, 0x319ee9d5, 0xc021b8f7, 0x9b540b19, 0x875fa099,
0x95f7997e, 0x623d7da8, 0xf837889a, 0x97e32d77, 0x11ed935f, 0x16681281,
0x0e358829, 0xc7e61fd6, 0x96dedfa1, 0x7858ba99, 0x57f584a5, 0x1b227263,
0x9b83c3ff, 0x1ac24696, 0xcdb30aeb, 0x532e3054, 0x8fd948e4, 0x6dbc3128,
0x58ebf2ef, 0x34c6ffea, 0xfe28ed61, 0xee7c3c73, 0x5d4a14d9, 0xe864b7e3,
0x42105d14, 0x203e13e0, 0x45eee2b6, 0xa3aaabea, 0xdb6c4f15, 0xfacb4fd0,
0xc742f442, 0xef6abbb5, 0x654f3b1d, 0x41cd2105, 0xd81e799e, 0x86854dc7,
0xe44b476a, 0x3d816250, 0xcf62a1f2, 0x5b8d2646, 0xfc8883a0, 0xc1c7b6a3,
0x7f1524c3, 0x69cb7492, 0x47848a0b, 0x5692b285, 0x095bbf00, 0xad19489d,
0x1462b174, 0x23820e00, 0x58428d2a, 0x0c55f5ea, 0x1dadf43e, 0x233f7061,
0x3372f092, 0x8d937e41, 0xd65fecf1, 0x6c223bdb, 0x7cde3759, 0xcbee7460,
0x4085f2a7, 0xce77326e, 0xa6078084, 0x19f8509e, 0xe8efd855, 0x61d99735,
0xa969a7aa, 0xc50c06c2, 0x5a04abfc, 0x800bcadc, 0x9e447a2e, 0xc3453484,
0xfdd56705, 0x0e1e9ec9, 0xdb73dbd3, 0x105588cd, 0x675fda79, 0xe3674340,
0xc5c43465, 0x713e38d8, 0x3d28f89e, 0xf16dff20, 0x153e21e7, 0x8fb03d4a,
0xe6e39f2b, 0xdb83adf7
};
public static readonly uint[] SBOX_INIT_3 =
{

0xe93d5a68, 0x948140f7, 0xf64c261c, 0x94692934,

0x411520f7, 0x7602d4f7, 0xbcf46b2e, 0xd4a20068, 0xd4082471, 0x3320f46a,
0x43b7d4b7, 0x500061af, 0x1e39f62e, 0x97244546, 0x14214f74, 0xbf8b8840,
0x4d95fc1d, 0x96b591af, 0x70f4ddd3, 0x66a02f45, 0xbfbc09ec, 0x03bd9785,
0x7fac6dd0, 0x31cb8504, 0x96eb27b3, 0x55fd3941, 0xda2547e6, 0xabca0a9a,
0x28507825, 0x530429f4, 0x0a2c86da, 0xe9b66dfb, 0x68dc1462, 0xd7486900,
0x680ec0a4, 0x27a18dee, 0x4f3ffea2, 0xe887ad8c, 0xb58ce006, 0x7af4d6b6,
0xaace1e7c, 0xd3375fec, 0xce78a399, 0x406b2a42, 0x20fe9e35, 0xd9f385b9,
0xee39d7ab, 0x3b124e8b, 0x1dc9faf7, 0x4b6d1856, 0x26a36631, 0xeae397b2,
0x3a6efa74, 0xdd5b4332, 0x6841e7f7, 0xca7820fb, 0xfb0af54e, 0xd8feb397,
0x454056ac, 0xba489527, 0x55533a3a, 0x20838d87, 0xfe6ba9b7, 0xd096954b,
0x55a867bc, 0xa1159a58, 0xcca92963, 0x99e1db33, 0xa62a4a56, 0x3f3125f9,
0x5ef47e1c, 0x9029317c, 0xfdf8e802, 0x04272f70, 0x80bb155c, 0x05282ce3,
0x95c11548, 0xe4c66d22, 0x48c1133f, 0xc70f86dc, 0x07f9c9ee, 0x41041f0f,
0x404779a4, 0x5d886e17, 0x325f51eb, 0xd59bc0d1, 0xf2bcc18f, 0x41113564,
0x257b7834, 0x602a9c60, 0xdff8e8a3, 0x1f636c1b, 0x0e12b4c2, 0x02e1329e,
0xaf664fd1, 0xcad18115, 0x6b2395e0, 0x333e92e1, 0x3b240b62, 0xeebeb922,
0x85b2a20e, 0xe6ba0d99, 0xde720c8c, 0x2da2f728, 0xd0127845, 0x95b794fd,
0x647d0862, 0xe7ccf5f0, 0x5449a36f, 0x877d48fa, 0xc39dfd27, 0xf33e8d1e,
0x0a476341, 0x992eff74, 0x3a6f6eab, 0xf4f8fd37, 0xa812dc60, 0xa1ebddf8,
0x991be14c, 0xdb6e6b0d, 0xc67b5510, 0x6d672c37, 0x2765d43b, 0xdcd0e804,
0xf1290dc7, 0xcc00ffa3, 0xb5390f92, 0x690fed0b, 0x667b9ffb, 0xcedb7d9c,
0xa091cf0b, 0xd9155ea3, 0xbb132f88, 0x515bad24, 0x7b9479bf, 0x763bd6eb,
0x37392eb3, 0xcc115979, 0x8026e297, 0xf42e312d, 0x6842ada7, 0xc66a2b3b,
0x12754ccc, 0x782ef11c, 0x6a124237, 0xb79251e7, 0x06a1bbe6, 0x4bfb6350,
0x1a6b1018, 0x11caedfa, 0x3d25bdd8, 0xe2e1c3c9, 0x44421659, 0x0a121386,
0xd90cec6e, 0xd5abea2a, 0x64af674e, 0xda86a85f, 0xbebfe988, 0x64e4c3fe,
0x9dbc8057, 0xf0f7c086, 0x60787bf8, 0x6003604d, 0xd1fd8346, 0xf6381fb0,
0x7745ae04, 0xd736fccc, 0x83426b33, 0xf01eab71, 0xb0804187, 0x3c005e5f,
0x77a057be, 0xbde8ae24, 0x55464299, 0xbf582e61, 0x4e58f48f, 0xf2ddfda2,
0xf474ef38, 0x8789bdc2, 0x5366f9c3, 0xc8b38e74, 0xb475f255, 0x46fcd9b9,
0x7aeb2661, 0x8b1ddf84, 0x846a0e79, 0x915f95e2, 0x466e598e, 0x20b45770,
0x8cd55591, 0xc902de4c, 0xb90bace1, 0xbb8205d0, 0x11a86248, 0x7574a99e,
0xb77f19b6, 0xe0a9dc09, 0x662d09a1, 0xc4324633, 0xe85a1f02, 0x09f0be8c,
0x4a99a025, 0x1d6efe10, 0x1ab93d1d, 0x0ba5a4df, 0xa186f20f, 0x2868f169,
0xdcb7da83, 0x573906fe, 0xa1e2ce9b, 0x4fcd7f52, 0x50115e01, 0xa70683fa,
0xa002b5c4, 0x0de6d027, 0x9af88c27, 0x773f8641, 0xc3604c06, 0x61a806b5,
0xf0177a28, 0xc0f586e0, 0x006058aa, 0x30dc7d62, 0x11e69ed7, 0x2338ea63,
0x53c2dd94, 0xc2c21634, 0xbbcbee56, 0x90bcb6de, 0xebfc7da1, 0xce591d76,
0x6f05e409, 0x4b7c0188, 0x39720a3d, 0x7c927c24, 0x86e3725f, 0x724d9db9,
0x1ac15bb4, 0xd39eb8fc, 0xed545578, 0x08fca5b5, 0xd83d7cd3, 0x4dad0fc4,
0x1e50ef5e, 0xb161e6f8, 0xa28514d9, 0x6c51133c, 0x6fd5c7e7, 0x56e14ec4,
0x362abfce, 0xddc6c837, 0xd79a3234, 0x92638212, 0x670efa8e, 0x406000e0
};
public static readonly uint[] SBOX_INIT_4 =
{

0x3a39ce37, 0xd3faf5cf, 0xabc27737, 0x5ac52d1b, 0x5cb0679e, 0x4fa33742,

0xd3822740, 0x99bc9bbe, 0xd5118e9d, 0xbf0f7315, 0xd62d1c7e, 0xc700c47b,
0xb78c1b6b, 0x21a19045, 0xb26eb1be, 0x6a366eb4, 0x5748ab2f, 0xbc946e79,
0xc6a376d2, 0x6549c2c8, 0x530ff8ee, 0x468dde7d, 0xd5730a1d, 0x4cd04dc6,
0x2939bbdb, 0xa9ba4650, 0xac9526e8, 0xbe5ee304, 0xa1fad5f0, 0x6a2d519a,
0x63ef8ce2, 0x9a86ee22, 0xc089c2b8, 0x43242ef6, 0xa51e03aa, 0x9cf2d0a4,
0x83c061ba, 0x9be96a4d, 0x8fe51550, 0xba645bd6, 0x2826a2f9, 0xa73a3ae1,
0x4ba99586, 0xef5562e9, 0xc72fefd3, 0xf752f7da, 0x3f046f69, 0x77fa0a59,
0x80e4a915, 0x87b08601, 0x9b09e6ad, 0x3b3ee593, 0xe990fd5a, 0x9e34d797,
0x2cf0b7d9, 0x022b8b51, 0x96d5ac3a, 0x017da67d, 0xd1cf3ed6, 0x7c7d2d28,
0x1f9f25cf, 0xadf2b89b, 0x5ad6b472, 0x5a88f54c, 0xe029ac71, 0xe019a5e6,
0x47b0acfd, 0xed93fa9b, 0xe8d3c48d, 0x283b57cc, 0xf8d56629, 0x79132e28,
0x785f0191, 0xed756055, 0xf7960e44, 0xe3d35e8c, 0x15056dd4, 0x88f46dba,
0x03a16125, 0x0564f0bd, 0xc3eb9e15, 0x3c9057a2, 0x97271aec, 0xa93a072a,
0x1b3f6d9b, 0x1e6321f5, 0xf59c66fb, 0x26dcf319, 0x7533d928, 0xb155fdf5,
0x03563482, 0x8aba3cbb, 0x28517711, 0xc20ad9f8, 0xabcc5167, 0xccad925f,
0x4de81751, 0x3830dc8e, 0x379d5862, 0x9320f991, 0xea7a90c2, 0xfb3e7bce,
0x5121ce64, 0x774fbe32, 0xa8b6e37e, 0xc3293d46, 0x48de5369, 0x6413e680,
0xa2ae0810, 0xdd6db224, 0x69852dfd, 0x09072166, 0xb39a460a, 0x6445c0dd,
0x586cdecf, 0x1c20c8ae, 0x5bbef7dd, 0x1b588d40, 0xccd2017f, 0x6bb4e3bb,
0xdda26a7e, 0x3a59ff45, 0x3e350a44, 0xbcb4cdd5, 0x72eacea8, 0xfa6484bb,
0x8d6612ae, 0xbf3c6f47, 0xd29be463, 0x542f5d9e, 0xaec2771b, 0xf64e6370,
0x740e0d8d, 0xe75b1357, 0xf8721671, 0xaf537d5d, 0x4040cb08, 0x4eb4e2cc,
0x34d2466a, 0x0115af84, 0xe1b00428, 0x95983a1d, 0x06b89fb4, 0xce6ea048,
0x6f3f3b82, 0x3520ab82, 0x011a1d4b, 0x277227f8, 0x611560b1, 0xe7933fdc,
0xbb3a792b, 0x344525bd, 0xa08839e1, 0x51ce794b, 0x2f32c9b7, 0xa01fbac9,
0xe01cc87e, 0xbcc7d1f6, 0xcf0111c3, 0xa1e8aac7, 0x1a908749, 0xd44fbd9a,
0xd0dadecb, 0xd50ada38, 0x0339c32a, 0xc6913667, 0x8df9317c, 0xe0b12b4f,
0xf79e59b7, 0x43f5bb3a, 0xf2d519ff, 0x27d9459c, 0xbf97222c, 0x15e6fc2a,
0x0f91fc71, 0x9b941525, 0xfae59361, 0xceb69ceb, 0xc2a86459, 0x12baa8d1,
0xb6c1075e, 0xe3056a0c, 0x10d25065, 0xcb03a442, 0xe0ec6e0e, 0x1698db3b,
0x4c98a0be, 0x3278e964, 0x9f1f9532, 0xe0d392df, 0xd3a0342b, 0x8971f21e,
0x1b0a7441, 0x4ba3348c, 0xc5be7120, 0xc37632d8, 0xdf359f8d, 0x9b992f2e,
0xe60b6f47, 0x0fe3f11d, 0xe54cda54, 0x1edad891, 0xce6279cf, 0xcd3e7e6f,
0x1618b166, 0xfd2c1d05, 0x848fd2c5, 0xf6fb2299, 0xf523f357, 0xa6327623,
0x93a83531, 0x56cccd02, 0xacf08162, 0x5a75ebb5, 0x6e163697, 0x88d273cc,
0xde966292, 0x81b949d0, 0x4c50901b, 0x71c65614, 0xe6c6c7bd, 0x327a140a,
0x45e1d006, 0xc3f27b9a, 0xc9aa53fd, 0x62a80f00, 0xbb25bfe2, 0x35bdd2f6,
0x71126905, 0xb2040222, 0xb6cbcf7c, 0xcd769c2b, 0x53113ec0, 0x1640e3d3,
0x38abbd60, 0x2547adf0, 0xba38209c, 0xf746ce76, 0x77afa1c5, 0x20756060,
0x85cbfe4e, 0x8ae88dd8, 0x7aaaf9b0, 0x4cf9aa7e, 0x1948c25c, 0x02fb8a8c,
0x01c36ae4, 0xd6ebe1f9, 0x90d4f869, 0xa65cdea0, 0x3f09252d, 0xc208e69f,
0xb74e6132, 0xce77e25b, 0x578fdfe3, 0x3ac372e6
};

protected byte[] m_block = new byte[BLOCK_SIZE];

protected int m_nIsWeakKey;
protected uint[] m_pbox = new uint[PBOX_ENTRIES];
protected uint[] m_sbox1 = new uint[SBOX_ENTRIES];
protected uint[] m_sbox2 = new uint[SBOX_ENTRIES];
protected uint[] m_sbox3 = new uint[SBOX_ENTRIES];
protected uint[] m_sbox4 = new uint[SBOX_ENTRIES];

//////////////////////////////////////////////////////////////////////

const int PBOX_ENTRIES = 18;
const int SBOX_ENTRIES = 256;

//////////////////////////////////////////////////////////////////////

static readonly byte[] TEST_KEY = { 0x1c, 0x58, 0x7f, 0x1c, 0x13, 0x92, 0x4f, 0xef };
static readonly uint[] TEST_VECTOR_CIPHER = { 0x55cb3774, 0xd13ef201 };
static readonly uint[] TEST_VECTOR_PLAIN = { 0x30553228, 0x6d6f295a };

#endregion Fields

#region Constructors

//////////////////////////////////////////////////////////////////////

///

/// Zero constructor, properly initializes an instance. Call
/// Initialize() afterwards to set up a valid key.
///

public BlowfishECB()
{
Initialize(null, 0, 0);
}

public BlowfishECB(string key)

{
byte[] localKey = Encoding.Convert(Encoding.Unicode, Encoding.ASCII, Encoding.Unicode.GetBytes(key));
Initialize(localKey, 0, 0);
}

public BlowfishECB(byte[] key)

{
Initialize(key, 0, 0);
}

//////////////////////////////////////////////////////////////////////

///

/// Standard constructor.
///

///
public BlowfishECB(
byte[] key,
int nOfs,
int nLen)
{
Initialize(key, nOfs, nLen);
}

#endregion Constructors

#region Properties

//////////////////////////////////////////////////////////////////////

///

/// To check if the key used is weak, which means that eventually
/// an attack is easier to apply than simple brute force on keys;
/// due to the randomness such a case is very unlikely to happen.
///

public bool IsWeakKey
{
get
{
// (NOTE: for performance reason we don't do the weak key
// check during the initialization, but on demand only)

if (-1 == m_nIsWeakKey)

{
m_nIsWeakKey = 0;

int nI, nJ;

for (nI = 0; nI < SBOX_ENTRIES - 1; nI++)
{
nJ = nI + 1;
while (nJ < SBOX_ENTRIES)
{
if ((m_sbox1[nI] == m_sbox1[nJ]) |
(m_sbox2[nI] == m_sbox2[nJ]) |
(m_sbox3[nI] == m_sbox3[nJ]) |
(m_sbox4[nI] == m_sbox4[nJ])) break;
else nJ++;
}
if (nJ < SBOX_ENTRIES)
{
m_nIsWeakKey = 1;
break;
}
}
}

return (1 == m_nIsWeakKey);

}
}

#endregion Properties

#region Methods

///

/// Executes a selftest
///

///
/// Call this method to make sure that the instance is able to produce
/// valid output according to the specification.
///
///
/// true: selftest passed / false: selftest failed
///
public static bool RunSelfTest()
{
uint unHi, unLo;
BlowfishECB bfe;

unHi = TEST_VECTOR_PLAIN[0];

unLo = TEST_VECTOR_PLAIN[1];

bfe = new BlowfishECB(TEST_KEY, 0, TEST_KEY.Length);

bfe.EncryptBlock(unHi, unLo, out unHi, out unLo);

if ((TEST_VECTOR_CIPHER[0] != unHi) ||

(TEST_VECTOR_CIPHER[1] != unLo))
{
return false;
}

bfe.DecryptBlock(unHi, unLo, out unHi, out unLo);

if ((TEST_VECTOR_PLAIN[0] != unHi) ||

(TEST_VECTOR_PLAIN[1] != unLo))
{
return false;
}

return true;

}

//////////////////////////////////////////////////////////////////////

///

/// Returns an identical, non-shallow copy of the current instance.
/// This can be very useful if you need multiple instances all using
/// the same key, since the expensive cipher setup will be bypassed.
///

///
/// The new instance, which usually typecasted back.
///
public object Clone()
{
BlowfishECB result;

result = new BlowfishECB();

result.m_pbox = (uint[])this.m_pbox.Clone();

result.m_sbox1 = (uint[])this.m_sbox1.Clone();

result.m_sbox2 = (uint[])this.m_sbox2.Clone();
result.m_sbox3 = (uint[])this.m_sbox3.Clone();
result.m_sbox4 = (uint[])this.m_sbox4.Clone();

result.m_block = (byte[])this.m_block.Clone();

result.m_nIsWeakKey = this.m_nIsWeakKey;

return result;

}

//////////////////////////////////////////////////////////////////////

///

/// Decrypts single bytes.
///

///
/// Use this method to decrypt bytes from one array to another one.
/// You can also use the same array for input and output. Note that
/// the number of bytes must be adjusted to the block size of the
/// algorithm. Overlapping bytes will not be decrypted. No check for
/// buffer overflows are made.
///
///
input buffer

///
where to start reading in the input buffer

///
output buffer

///
where to start writing to the output buffer

///
number ob bytes to decrypt

///

/// number of bytes processed
///
public int Decrypt(
byte[] dataIn,
int nPosIn,
byte[] dataOut,
int nPosOut,
int nCount)
{
int nEnd;
uint unHi, unLo;

uint[] sbox1 = m_sbox1;

uint[] sbox2 = m_sbox2;
uint[] sbox3 = m_sbox3;
uint[] sbox4 = m_sbox4;

uint[] pbox = m_pbox;

uint pbox00 = pbox[0];

uint pbox01 = pbox[1];
uint pbox02 = pbox[2];
uint pbox03 = pbox[3];
uint pbox04 = pbox[4];
uint pbox05 = pbox[5];
uint pbox06 = pbox[6];
uint pbox07 = pbox[7];
uint pbox08 = pbox[8];
uint pbox09 = pbox[9];
uint pbox10 = pbox[10];
uint pbox11 = pbox[11];
uint pbox12 = pbox[12];
uint pbox13 = pbox[13];
uint pbox14 = pbox[14];
uint pbox15 = pbox[15];
uint pbox16 = pbox[16];
uint pbox17 = pbox[17];

nCount &= ~(BLOCK_SIZE - 1);

nEnd = nPosIn + nCount;

while (nPosIn < nEnd)

{
unHi = (((uint)dataIn[nPosIn]) << 24) |
(((uint)dataIn[nPosIn + 1]) << 16) |
(((uint)dataIn[nPosIn + 2]) << 8) |
dataIn[nPosIn + 3];

unLo = (((uint)dataIn[nPosIn + 4]) << 24) |

(((uint)dataIn[nPosIn + 5]) << 16) |
(((uint)dataIn[nPosIn + 6]) << 8) |
dataIn[nPosIn + 7];
nPosIn += 8;

unHi ^= pbox17;

unLo ^= (((sbox1[(int)(unHi >> 24)] + sbox2[(int)((unHi >> 16) & 0x0ff)]) ^ sbox3[(int)((unHi >> 8) & 0x0ff)]) + sbox4[(int)(unHi & 0x0ff)]) ^ pbox16;
unHi ^= (((sbox1[(int)(unLo >> 24)] + sbox2[(int)((unLo >> 16) & 0x0ff)]) ^ sbox3[(int)((unLo >> 8) & 0x0ff)]) + sbox4[(int)(unLo & 0x0ff)]) ^ pbox15;
unLo ^= (((sbox1[(int)(unHi >> 24)] + sbox2[(int)((unHi >> 16) & 0x0ff)]) ^ sbox3[(int)((unHi >> 8) & 0x0ff)]) + sbox4[(int)(unHi & 0x0ff)]) ^ pbox14;
unHi ^= (((sbox1[(int)(unLo >> 24)] + sbox2[(int)((unLo >> 16) & 0x0ff)]) ^ sbox3[(int)((unLo >> 8) & 0x0ff)]) + sbox4[(int)(unLo & 0x0ff)]) ^ pbox13;
unLo ^= (((sbox1[(int)(unHi >> 24)] + sbox2[(int)((unHi >> 16) & 0x0ff)]) ^ sbox3[(int)((unHi >> 8) & 0x0ff)]) + sbox4[(int)(unHi & 0x0ff)]) ^ pbox12;
unHi ^= (((sbox1[(int)(unLo >> 24)] + sbox2[(int)((unLo >> 16) & 0x0ff)]) ^ sbox3[(int)((unLo >> 8) & 0x0ff)]) + sbox4[(int)(unLo & 0x0ff)]) ^ pbox11;
unLo ^= (((sbox1[(int)(unHi >> 24)] + sbox2[(int)((unHi >> 16) & 0x0ff)]) ^ sbox3[(int)((unHi >> 8) & 0x0ff)]) + sbox4[(int)(unHi & 0x0ff)]) ^ pbox10;
unHi ^= (((sbox1[(int)(unLo >> 24)] + sbox2[(int)((unLo >> 16) & 0x0ff)]) ^ sbox3[(int)((unLo >> 8) & 0x0ff)]) + sbox4[(int)(unLo & 0x0ff)]) ^ pbox09;
unLo ^= (((sbox1[(int)(unHi >> 24)] + sbox2[(int)((unHi >> 16) & 0x0ff)]) ^ sbox3[(int)((unHi >> 8) & 0x0ff)]) + sbox4[(int)(unHi & 0x0ff)]) ^ pbox08;
unHi ^= (((sbox1[(int)(unLo >> 24)] + sbox2[(int)((unLo >> 16) & 0x0ff)]) ^ sbox3[(int)((unLo >> 8) & 0x0ff)]) + sbox4[(int)(unLo & 0x0ff)]) ^ pbox07;
unLo ^= (((sbox1[(int)(unHi >> 24)] + sbox2[(int)((unHi >> 16) & 0x0ff)]) ^ sbox3[(int)((unHi >> 8) & 0x0ff)]) + sbox4[(int)(unHi & 0x0ff)]) ^ pbox06;
unHi ^= (((sbox1[(int)(unLo >> 24)] + sbox2[(int)((unLo >> 16) & 0x0ff)]) ^ sbox3[(int)((unLo >> 8) & 0x0ff)]) + sbox4[(int)(unLo & 0x0ff)]) ^ pbox05;
unLo ^= (((sbox1[(int)(unHi >> 24)] + sbox2[(int)((unHi >> 16) & 0x0ff)]) ^ sbox3[(int)((unHi >> 8) & 0x0ff)]) + sbox4[(int)(unHi & 0x0ff)]) ^ pbox04;
unHi ^= (((sbox1[(int)(unLo >> 24)] + sbox2[(int)((unLo >> 16) & 0x0ff)]) ^ sbox3[(int)((unLo >> 8) & 0x0ff)]) + sbox4[(int)(unLo & 0x0ff)]) ^ pbox03;
unLo ^= (((sbox1[(int)(unHi >> 24)] + sbox2[(int)((unHi >> 16) & 0x0ff)]) ^ sbox3[(int)((unHi >> 8) & 0x0ff)]) + sbox4[(int)(unHi & 0x0ff)]) ^ pbox02;
unHi ^= (((sbox1[(int)(unLo >> 24)] + sbox2[(int)((unLo >> 16) & 0x0ff)]) ^ sbox3[(int)((unLo >> 8) & 0x0ff)]) + sbox4[(int)(unLo & 0x0ff)]) ^ pbox01;

unLo ^= pbox00;

dataOut[nPosOut] = (byte)(unLo >> 24);

dataOut[nPosOut + 1] = (byte)(unLo >> 16);
dataOut[nPosOut + 2] = (byte)(unLo >> 8);
dataOut[nPosOut + 3] = (byte)unLo;

dataOut[nPosOut + 4] = (byte)(unHi >> 24);

dataOut[nPosOut + 5] = (byte)(unHi >> 16);
dataOut[nPosOut + 6] = (byte)(unHi >> 8);
dataOut[nPosOut + 7] = (byte)unHi;

nPosOut += 8;

}

return nCount;

}

//////////////////////////////////////////////////////////////////////

///

/// Decrypts a single block.
///

///
high 32bit word of the block
///
low 32bit word of the block
///
where to put the decrypted high word
///
where to put the decrypted low word
public void DecryptBlock(
uint unHi,
uint unLo,
out uint unOutHi,
out uint unOutLo)
{
byte[] block;

block = m_block;

block[0] = (byte)(unHi >> 24);

block[1] = (byte)(unHi >> 16);
block[2] = (byte)(unHi >> 8);
block[3] = (byte)unHi;
block[4] = (byte)(unLo >> 24);
block[5] = (byte)(unLo >> 16);
block[6] = (byte)(unLo >> 8);
block[7] = (byte)unLo;

Decrypt(block, 0, block, 0, BLOCK_SIZE);

unOutHi = (((uint)block[0]) << 24) |

(((uint)block[1]) << 16) |
(((uint)block[2]) << 8) |
block[3];

unOutLo = (((uint)block[4]) << 24) |

(((uint)block[5]) << 16) |
(((uint)block[6]) << 8) |
block[7];
}

//////////////////////////////////////////////////////////////////////

///

/// Encrypts byte buffers
///

///
/// Use this method to encrypt bytes from one array to another one.
/// You can also use the same array for input and output. Note that
/// the number of bytes must be adjusted to the block size of the
/// algorithm. Overlapping bytes will not be encrypted. No check for
/// buffer overflows are made.
///
///
input buffer
///
where to start reading in the input buffer
///
output buffer
///
where to start writing to the output buffer
///
number ob bytes to encrypt
///
/// number of bytes processed
///
public int Encrypt(
byte[] dataIn,
int nPosIn,
byte[] dataOut,
int nPosOut,
int nCount)
{
int nEnd;
uint unHi, unLo;

uint[] sbox1 = m_sbox1;

uint[] sbox2 = m_sbox2;
uint[] sbox3 = m_sbox3;
uint[] sbox4 = m_sbox4;

uint[] pbox = m_pbox;

uint pbox00 = pbox[0];

uint pbox01 = pbox[1];
uint pbox02 = pbox[2];
uint pbox03 = pbox[3];
uint pbox04 = pbox[4];
uint pbox05 = pbox[5];
uint pbox06 = pbox[6];
uint pbox07 = pbox[7];
uint pbox08 = pbox[8];
uint pbox09 = pbox[9];
uint pbox10 = pbox[10];
uint pbox11 = pbox[11];
uint pbox12 = pbox[12];
uint pbox13 = pbox[13];
uint pbox14 = pbox[14];
uint pbox15 = pbox[15];
uint pbox16 = pbox[16];
uint pbox17 = pbox[17];

nCount &= ~(BLOCK_SIZE - 1);

nEnd = nPosIn + nCount;

while (nPosIn < nEnd)

{
unHi = (((uint)dataIn[nPosIn]) << 24) |
(((uint)dataIn[nPosIn + 1]) << 16) |
(((uint)dataIn[nPosIn + 2]) << 8) |
dataIn[nPosIn + 3];

unLo = (((uint)dataIn[nPosIn + 4]) << 24) |

(((uint)dataIn[nPosIn + 5]) << 16) |
(((uint)dataIn[nPosIn + 6]) << 8) |
dataIn[nPosIn + 7];
nPosIn += 8;

unHi ^= pbox00;

unLo ^= (((sbox1[(int)(unHi >> 24)] + sbox2[(int)((unHi >> 16) & 0x0ff)]) ^ sbox3[(int)((unHi >> 8) & 0x0ff)]) + sbox4[(int)(unHi & 0x0ff)]) ^ pbox01;
unHi ^= (((sbox1[(int)(unLo >> 24)] + sbox2[(int)((unLo >> 16) & 0x0ff)]) ^ sbox3[(int)((unLo >> 8) & 0x0ff)]) + sbox4[(int)(unLo & 0x0ff)]) ^ pbox02;
unLo ^= (((sbox1[(int)(unHi >> 24)] + sbox2[(int)((unHi >> 16) & 0x0ff)]) ^ sbox3[(int)((unHi >> 8) & 0x0ff)]) + sbox4[(int)(unHi & 0x0ff)]) ^ pbox03;
unHi ^= (((sbox1[(int)(unLo >> 24)] + sbox2[(int)((unLo >> 16) & 0x0ff)]) ^ sbox3[(int)((unLo >> 8) & 0x0ff)]) + sbox4[(int)(unLo & 0x0ff)]) ^ pbox04;
unLo ^= (((sbox1[(int)(unHi >> 24)] + sbox2[(int)((unHi >> 16) & 0x0ff)]) ^ sbox3[(int)((unHi >> 8) & 0x0ff)]) + sbox4[(int)(unHi & 0x0ff)]) ^ pbox05;
unHi ^= (((sbox1[(int)(unLo >> 24)] + sbox2[(int)((unLo >> 16) & 0x0ff)]) ^ sbox3[(int)((unLo >> 8) & 0x0ff)]) + sbox4[(int)(unLo & 0x0ff)]) ^ pbox06;
unLo ^= (((sbox1[(int)(unHi >> 24)] + sbox2[(int)((unHi >> 16) & 0x0ff)]) ^ sbox3[(int)((unHi >> 8) & 0x0ff)]) + sbox4[(int)(unHi & 0x0ff)]) ^ pbox07;
unHi ^= (((sbox1[(int)(unLo >> 24)] + sbox2[(int)((unLo >> 16) & 0x0ff)]) ^ sbox3[(int)((unLo >> 8) & 0x0ff)]) + sbox4[(int)(unLo & 0x0ff)]) ^ pbox08;
unLo ^= (((sbox1[(int)(unHi >> 24)] + sbox2[(int)((unHi >> 16) & 0x0ff)]) ^ sbox3[(int)((unHi >> 8) & 0x0ff)]) + sbox4[(int)(unHi & 0x0ff)]) ^ pbox09;
unHi ^= (((sbox1[(int)(unLo >> 24)] + sbox2[(int)((unLo >> 16) & 0x0ff)]) ^ sbox3[(int)((unLo >> 8) & 0x0ff)]) + sbox4[(int)(unLo & 0x0ff)]) ^ pbox10;
unLo ^= (((sbox1[(int)(unHi >> 24)] + sbox2[(int)((unHi >> 16) & 0x0ff)]) ^ sbox3[(int)((unHi >> 8) & 0x0ff)]) + sbox4[(int)(unHi & 0x0ff)]) ^ pbox11;
unHi ^= (((sbox1[(int)(unLo >> 24)] + sbox2[(int)((unLo >> 16) & 0x0ff)]) ^ sbox3[(int)((unLo >> 8) & 0x0ff)]) + sbox4[(int)(unLo & 0x0ff)]) ^ pbox12;
unLo ^= (((sbox1[(int)(unHi >> 24)] + sbox2[(int)((unHi >> 16) & 0x0ff)]) ^ sbox3[(int)((unHi >> 8) & 0x0ff)]) + sbox4[(int)(unHi & 0x0ff)]) ^ pbox13;
unHi ^= (((sbox1[(int)(unLo >> 24)] + sbox2[(int)((unLo >> 16) & 0x0ff)]) ^ sbox3[(int)((unLo >> 8) & 0x0ff)]) + sbox4[(int)(unLo & 0x0ff)]) ^ pbox14;
unLo ^= (((sbox1[(int)(unHi >> 24)] + sbox2[(int)((unHi >> 16) & 0x0ff)]) ^ sbox3[(int)((unHi >> 8) & 0x0ff)]) + sbox4[(int)(unHi & 0x0ff)]) ^ pbox15;
unHi ^= (((sbox1[(int)(unLo >> 24)] + sbox2[(int)((unLo >> 16) & 0x0ff)]) ^ sbox3[(int)((unLo >> 8) & 0x0ff)]) + sbox4[(int)(unLo & 0x0ff)]) ^ pbox16;

unLo ^= pbox17;

dataOut[nPosOut] = (byte)(unLo >> 24);

dataOut[nPosOut + 1] = (byte)(unLo >> 16);
dataOut[nPosOut + 2] = (byte)(unLo >> 8);
dataOut[nPosOut + 3] = (byte)unLo;

dataOut[nPosOut + 4] = (byte)(unHi >> 24);

dataOut[nPosOut + 5] = (byte)(unHi >> 16);
dataOut[nPosOut + 6] = (byte)(unHi >> 8);
dataOut[nPosOut + 7] = (byte)unHi;

nPosOut += 8;

}

return nCount;

}

//////////////////////////////////////////////////////////////////////

///

/// Encrypts a single block.
///

///
high 32bit word of the block
///
low 32bit word of the block
///
where to put the encrypted high word
///
where to put the encrypted low word
public void EncryptBlock(
uint unHi,
uint unLo,
out uint unOutHi,
out uint unOutLo)
{
byte[] block;
block = m_block;

block[0] = (byte)(unHi >> 24);

block[1] = (byte)(unHi >> 16);
block[2] = (byte)(unHi >> 8);
block[3] = (byte)unHi;
block[4] = (byte)(unLo >> 24);
block[5] = (byte)(unLo >> 16);
block[6] = (byte)(unLo >> 8);
block[7] = (byte)unLo;

Encrypt(block, 0, block, 0, BLOCK_SIZE);

unOutHi = (((uint)block[0]) << 24) |

(((uint)block[1]) << 16) |
(((uint)block[2]) << 8) |
block[3];

unOutLo = (((uint)block[4]) << 24) |

(((uint)block[5]) << 16) |
(((uint)block[6]) << 8) |
block[7];
}

public void Initialize(string key)

{
byte[] localKey = Encoding.Convert(Encoding.Unicode, Encoding.ASCII, Encoding.Unicode.GetBytes(key));
Initialize(localKey, 0, 0);
}

//////////////////////////////////////////////////////////////////////

///

/// Resets the instance with a key material. Allows the switch of
/// keys at runtime without any object allocation.
///

///
/// Buffer with the (binary) key material.
///
///
/// Position at which the key material starts in the buffer.
///
///
/// Size of the key material (up to MAX_KEY_LENGTH bytes).
///
public void Initialize(
byte[] key,
int nOfs,
int nLen)
{
int nI, nJ, nKeyPos, nKeyEnd;
uint unBuild, unHi, unLo;
uint[] box;

m_nIsWeakKey = -1;

Array.Copy(PBOX_INIT, 0, m_pbox, 0, PBOX_INIT.Length);

Array.Copy(SBOX_INIT_1, 0, m_sbox1, 0, SBOX_INIT_1.Length);
Array.Copy(SBOX_INIT_2, 0, m_sbox2, 0, SBOX_INIT_2.Length);
Array.Copy(SBOX_INIT_3, 0, m_sbox3, 0, SBOX_INIT_3.Length);
Array.Copy(SBOX_INIT_4, 0, m_sbox4, 0, SBOX_INIT_4.Length);

if (nOfs < 0)

throw new ArgumentOutOfRangeException("nOfs");
if (nLen < 0 || nLen > key.Length)
throw new ArgumentOutOfRangeException("nLen");
if (key.Length < nOfs + nLen)
throw new ArgumentOutOfRangeException("nLen or nOfs");
if (0 == nLen)
nLen = key.Length - nOfs;

nKeyPos = nOfs;

nKeyEnd = nOfs + nLen;
unBuild = 0;

for (nI = 0; nI < PBOX_ENTRIES; nI++)

{
for (nJ = 0; nJ < 4; nJ++)
{
unBuild = (unBuild << 8) | key[nKeyPos];

if (++nKeyPos == nKeyEnd)

{
nKeyPos = nOfs;
}
}
m_pbox[nI] ^= unBuild;
}

unHi = unLo = 0;

box = m_pbox;

for (nI = 0; nI < PBOX_ENTRIES; )
{
EncryptBlock(unHi, unLo, out unHi, out unLo);
box[nI++] = unHi;
box[nI++] = unLo;
}
box = m_sbox1;
for (nI = 0; nI < SBOX_ENTRIES; )
{
EncryptBlock(unHi, unLo, out unHi, out unLo);
box[nI++] = unHi;
box[nI++] = unLo;
}
box = m_sbox2;
for (nI = 0; nI < SBOX_ENTRIES; )
{
EncryptBlock(unHi, unLo, out unHi, out unLo);
box[nI++] = unHi;
box[nI++] = unLo;
}
box = m_sbox3;
for (nI = 0; nI < SBOX_ENTRIES; )
{
EncryptBlock(unHi, unLo, out unHi, out unLo);
box[nI++] = unHi;
box[nI++] = unLo;
}
box = m_sbox4;
for (nI = 0; nI < SBOX_ENTRIES; )
{
EncryptBlock(unHi, unLo, out unHi, out unLo);
box[nI++] = unHi;
box[nI++] = unLo;
}
}

//////////////////////////////////////////////////////////////////////

///

/// Deletes all internal data structures and invalidates this instance.
///

///
/// Call this method as soon as the work with a particular instance is
/// done. By this no sensitive translated key material remains. The
/// instance is invalid after this call and usage can lead to unexpected
/// results.
///
public void Invalidate()
{
Array.Clear(m_pbox, 0, m_pbox.Length);

Array.Clear(m_sbox1, 0, m_sbox1.Length);

Array.Clear(m_sbox2, 0, m_sbox2.Length);
Array.Clear(m_sbox3, 0, m_sbox3.Length);
Array.Clear(m_sbox4, 0, m_sbox4.Length);

Array.Clear(m_block, 0, m_block.Length);

}

#endregion Methods

}
}