using System;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Crypto.Utilities;
namespace Org.BouncyCastle.Crypto.Engines{
/// <remarks>A class that provides a basic DES engine.</remarks>
public class DesEngine
: IBlockCipher
{
internal const int BLOCK_SIZE = 8;
private int[] workingKey;
public virtual int[] GetWorkingKey()
{
return workingKey;
}
/**
* initialise a DES cipher.
*
* @param forEncryption whether or not we are for encryption.
* @param parameters the parameters required to set up the cipher.
* @exception ArgumentException if the parameters argument is
* inappropriate.
*/
public virtual void Init(
bool forEncryption,
ICipherParameters parameters)
{
if (!(parameters is KeyParameter))
throw new ArgumentException("invalid parameter passed to DES init - " + parameters.GetType().ToString());
workingKey = GenerateWorkingKey(forEncryption, ((KeyParameter)parameters).GetKey());
}
public virtual string AlgorithmName
{
get { return "DES"; }
}
public bool IsPartialBlockOkay
{
get { return false; }
}
public virtual int GetBlockSize()
{
return BLOCK_SIZE;
}
public virtual int ProcessBlock(
byte[] input,
int inOff,
byte[] output,
int outOff)
{
if (workingKey == null)
throw new InvalidOperationException("DES engine not initialised");
if ((inOff + BLOCK_SIZE) > input.Length)
throw new DataLengthException("input buffer too short");
if ((outOff + BLOCK_SIZE) > output.Length)
throw new DataLengthException("output buffer too short");
DesFunc(workingKey, input, inOff, output, outOff);
return BLOCK_SIZE;
}
public virtual void Reset()
{
}
/**
* what follows is mainly taken from "Applied Cryptography", by
* Bruce Schneier, however it also bears great resemblance to Richard
* Outerbridge's D3DES...
*/
// private static readonly short[] Df_Key =
// {
// 0x01,0x23,0x45,0x67,0x89,0xab,0xcd,0xef,
// 0xfe,0xdc,0xba,0x98,0x76,0x54,0x32,0x10,
// 0x89,0xab,0xcd,0xef,0x01,0x23,0x45,0x67
// };
private static readonly short[] bytebit =
{
128, 64, 32, 16, 8, 4, 2, 1
};
private static readonly int[] bigbyte =
{
0x800000, 0x400000, 0x200000, 0x100000,
0x80000, 0x40000, 0x20000, 0x10000,
0x8000, 0x4000, 0x2000, 0x1000,
0x800, 0x400, 0x200, 0x100,
0x80, 0x40, 0x20, 0x10,
0x8, 0x4, 0x2, 0x1
};
/*
* Use the key schedule specified in the Standard (ANSI X3.92-1981).
*/
private static readonly byte[] pc1 =
{
56, 48, 40, 32, 24, 16, 8, 0, 57, 49, 41, 33, 25, 17,
9, 1, 58, 50, 42, 34, 26, 18, 10, 2, 59, 51, 43, 35,
62, 54, 46, 38, 30, 22, 14, 6, 61, 53, 45, 37, 29, 21,
13, 5, 60, 52, 44, 36, 28, 20, 12, 4, 27, 19, 11, 3
};
private static readonly byte[] totrot =
{
1, 2, 4, 6, 8, 10, 12, 14,
15, 17, 19, 21, 23, 25, 27, 28
};
private static readonly byte[] pc2 =
{
13, 16, 10, 23, 0, 4, 2, 27, 14, 5, 20, 9,
22, 18, 11, 3, 25, 7, 15, 6, 26, 19, 12, 1,
40, 51, 30, 36, 46, 54, 29, 39, 50, 44, 32, 47,
43, 48, 38, 55, 33, 52, 45, 41, 49, 35, 28, 31
};
private static readonly uint[] SP1 =
{
0x01010400, 0x00000000, 0x00010000, 0x01010404,
0x01010004, 0x00010404, 0x00000004, 0x00010000,
0x00000400, 0x01010400, 0x01010404, 0x00000400,
0x01000404, 0x01010004, 0x01000000, 0x00000004,
0x00000404, 0x01000400, 0x01000400, 0x00010400,
0x00010400, 0x01010000, 0x01010000, 0x01000404,
0x00010004, 0x01000004, 0x01000004, 0x00010004,
0x00000000, 0x00000404, 0x00010404, 0x01000000,
0x00010000, 0x01010404, 0x00000004, 0x01010000,
0x01010400, 0x01000000, 0x01000000, 0x00000400,
0x01010004, 0x00010000, 0x00010400, 0x01000004,
0x00000400, 0x00000004, 0x01000404, 0x00010404,
0x01010404, 0x00010004, 0x01010000, 0x01000404,
0x01000004, 0x00000404, 0x00010404, 0x01010400,
0x00000404, 0x01000400, 0x01000400, 0x00000000,
0x00010004, 0x00010400, 0x00000000, 0x01010004
};
private static readonly uint[] SP2 =
{
0x80108020, 0x80008000, 0x00008000, 0x00108020,
0x00100000, 0x00000020, 0x80100020, 0x80008020,
0x80000020, 0x80108020, 0x80108000, 0x80000000,
0x80008000, 0x00100000, 0x00000020, 0x80100020,
0x00108000, 0x00100020, 0x80008020, 0x00000000,
0x80000000, 0x00008000, 0x00108020, 0x80100000,
0x00100020, 0x80000020, 0x00000000, 0x00108000,
0x00008020, 0x80108000, 0x80100000, 0x00008020,
0x00000000, 0x00108020, 0x80100020, 0x00100000,
0x80008020, 0x80100000, 0x80108000, 0x00008000,
0x80100000, 0x80008000, 0x00000020, 0x80108020,
0x00108020, 0x00000020, 0x00008000, 0x80000000,
0x00008020, 0x80108000, 0x00100000, 0x80000020,
0x00100020, 0x80008020, 0x80000020, 0x00100020,
0x00108000, 0x00000000, 0x80008000, 0x00008020,
0x80000000, 0x80100020, 0x80108020, 0x00108000
};
private static readonly uint[] SP3 =
{
0x00000208, 0x08020200, 0x00000000, 0x08020008,
0x08000200, 0x00000000, 0x00020208, 0x08000200,
0x00020008, 0x08000008, 0x08000008, 0x00020000,
0x08020208, 0x00020008, 0x08020000, 0x00000208,
0x08000000, 0x00000008, 0x08020200, 0x00000200,
0x00020200, 0x08020000, 0x08020008, 0x00020208,
0x08000208, 0x00020200, 0x00020000, 0x08000208,
0x00000008, 0x08020208, 0x00000200, 0x08000000,
0x08020200, 0x08000000, 0x00020008, 0x00000208,
0x00020000, 0x08020200, 0x08000200, 0x00000000,
0x00000200, 0x00020008, 0x08020208, 0x08000200,
0x08000008, 0x00000200, 0x00000000, 0x08020008,
0x08000208, 0x00020000, 0x08000000, 0x08020208,
0x00000008, 0x00020208, 0x00020200, 0x08000008,
0x08020000, 0x08000208, 0x00000208, 0x08020000,
0x00020208, 0x00000008, 0x08020008, 0x00020200
};
private static readonly uint[] SP4 =
{
0x00802001, 0x00002081, 0x00002081, 0x00000080,
0x00802080, 0x00800081, 0x00800001, 0x00002001,
0x00000000, 0x00802000, 0x00802000, 0x00802081,
0x00000081, 0x00000000, 0x00800080, 0x00800001,
0x00000001, 0x00002000, 0x00800000, 0x00802001,
0x00000080, 0x00800000, 0x00002001, 0x00002080,
0x00800081, 0x00000001, 0x00002080, 0x00800080,
0x00002000, 0x00802080, 0x00802081, 0x00000081,
0x00800080, 0x00800001, 0x00802000, 0x00802081,
0x00000081, 0x00000000, 0x00000000, 0x00802000,
0x00002080, 0x00800080, 0x00800081, 0x00000001,
0x00802001, 0x00002081, 0x00002081, 0x00000080,
0x00802081, 0x00000081, 0x00000001, 0x00002000,
0x00800001, 0x00002001, 0x00802080, 0x00800081,
0x00002001, 0x00002080, 0x00800000, 0x00802001,
0x00000080, 0x00800000, 0x00002000, 0x00802080
};
private static readonly uint[] SP5 =
{
0x00000100, 0x02080100, 0x02080000, 0x42000100,
0x00080000, 0x00000100, 0x40000000, 0x02080000,
0x40080100, 0x00080000, 0x02000100, 0x40080100,
0x42000100, 0x42080000, 0x00080100, 0x40000000,
0x02000000, 0x40080000, 0x40080000, 0x00000000,
0x40000100, 0x42080100, 0x42080100, 0x02000100,
0x42080000, 0x40000100, 0x00000000, 0x42000000,
0x02080100, 0x02000000, 0x42000000, 0x00080100,
0x00080000, 0x42000100, 0x00000100, 0x02000000,
0x40000000, 0x02080000, 0x42000100, 0x40080100,
0x02000100, 0x40000000, 0x42080000, 0x02080100,
0x40080100, 0x00000100, 0x02000000, 0x42080000,
0x42080100, 0x00080100, 0x42000000, 0x42080100,
0x02080000, 0x00000000, 0x40080000, 0x42000000,
0x00080100, 0x02000100, 0x40000100, 0x00080000,
0x00000000, 0x40080000, 0x02080100, 0x40000100
};
private static readonly uint[] SP6 =
{
0x20000010, 0x20400000, 0x00004000, 0x20404010,
0x20400000, 0x00000010, 0x20404010, 0x00400000,
0x20004000, 0x00404010, 0x00400000, 0x20000010,
0x00400010, 0x20004000, 0x20000000, 0x00004010,
0x00000000, 0x00400010, 0x20004010, 0x00004000,
0x00404000, 0x20004010, 0x00000010, 0x20400010,
0x20400010, 0x00000000, 0x00404010, 0x20404000,
0x00004010, 0x00404000, 0x20404000, 0x20000000,
0x20004000, 0x00000010, 0x20400010, 0x00404000,
0x20404010, 0x00400000, 0x00004010, 0x20000010,
0x00400000, 0x20004000, 0x20000000, 0x00004010,
0x20000010, 0x20404010, 0x00404000, 0x20400000,
0x00404010, 0x20404000, 0x00000000, 0x20400010,
0x00000010, 0x00004000, 0x20400000, 0x00404010,
0x00004000, 0x00400010, 0x20004010, 0x00000000,
0x20404000, 0x20000000, 0x00400010, 0x20004010
};
private static readonly uint[] SP7 =
{
0x00200000, 0x04200002, 0x04000802, 0x00000000,
0x00000800, 0x04000802, 0x00200802, 0x04200800,
0x04200802, 0x00200000, 0x00000000, 0x04000002,
0x00000002, 0x04000000, 0x04200002, 0x00000802,
0x04000800, 0x00200802, 0x00200002, 0x04000800,
0x04000002, 0x04200000, 0x04200800, 0x00200002,
0x04200000, 0x00000800, 0x00000802, 0x04200802,
0x00200800, 0x00000002, 0x04000000, 0x00200800,
0x04000000, 0x00200800, 0x00200000, 0x04000802,
0x04000802, 0x04200002, 0x04200002, 0x00000002,
0x00200002, 0x04000000, 0x04000800, 0x00200000,
0x04200800, 0x00000802, 0x00200802, 0x04200800,
0x00000802, 0x04000002, 0x04200802, 0x04200000,
0x00200800, 0x00000000, 0x00000002, 0x04200802,
0x00000000, 0x00200802, 0x04200000, 0x00000800,
0x04000002, 0x04000800, 0x00000800, 0x00200002
};
private static readonly uint[] SP8 =
{
0x10001040, 0x00001000, 0x00040000, 0x10041040,
0x10000000, 0x10001040, 0x00000040, 0x10000000,
0x00040040, 0x10040000, 0x10041040, 0x00041000,
0x10041000, 0x00041040, 0x00001000, 0x00000040,
0x10040000, 0x10000040, 0x10001000, 0x00001040,
0x00041000, 0x00040040, 0x10040040, 0x10041000,
0x00001040, 0x00000000, 0x00000000, 0x10040040,
0x10000040, 0x10001000, 0x00041040, 0x00040000,
0x00041040, 0x00040000, 0x10041000, 0x00001000,
0x00000040, 0x10040040, 0x00001000, 0x00041040,
0x10001000, 0x00000040, 0x10000040, 0x10040000,
0x10040040, 0x10000000, 0x00040000, 0x10001040,
0x00000000, 0x10041040, 0x00040040, 0x10000040,
0x10040000, 0x10001000, 0x10001040, 0x00000000,
0x10041040, 0x00041000, 0x00041000, 0x00001040,
0x00001040, 0x00040040, 0x10000000, 0x10041000
};
/**
* Generate an integer based working key based on our secret key
* and what we processing we are planning to do.
*
* Acknowledgements for this routine go to James Gillogly and Phil Karn.
* (whoever, and wherever they are!).
*/
protected static int[] GenerateWorkingKey(
bool encrypting,
byte[] key)
{
int[] newKey = new int[32];
bool[] pc1m = new bool[56];
bool[] pcr = new bool[56];
for (int j = 0; j < 56; j++ )
{
int l = pc1[j];
pc1m[j] = ((key[(uint) l >> 3] & bytebit[l & 07]) != 0);
}
for (int i = 0; i < 16; i++)
{
int l, m, n;
if (encrypting)
{
m = i << 1;
}
else
{
m = (15 - i) << 1;
}
n = m + 1;
newKey[m] = newKey[n] = 0;
for (int j = 0; j < 28; j++)
{
l = j + totrot[i];
if ( l < 28 )
{
pcr[j] = pc1m[l];
}
else
{
pcr[j] = pc1m[l - 28];
}
}
for (int j = 28; j < 56; j++)
{
l = j + totrot[i];
if (l < 56 )
{
pcr[j] = pc1m[l];
}
else
{
pcr[j] = pc1m[l - 28];
}
}
for (int j = 0; j < 24; j++)
{
if (pcr[pc2[j]])
{
newKey[m] |= bigbyte[j];
}
if (pcr[pc2[j + 24]])
{
newKey[n] |= bigbyte[j];
}
}
}
//
// store the processed key
//
for (int i = 0; i != 32; i += 2)
{
int i1, i2;
i1 = newKey[i];
i2 = newKey[i + 1];
newKey[i] = (int) ( (uint) ((i1 & 0x00fc0000) << 6) |
(uint) ((i1 & 0x00000fc0) << 10) |
((uint) (i2 & 0x00fc0000) >> 10) |
((uint) (i2 & 0x00000fc0) >> 6));
newKey[i + 1] = (int) ( (uint) ((i1 & 0x0003f000) << 12) |
(uint) ((i1 & 0x0000003f) << 16) |
((uint) (i2 & 0x0003f000) >> 4) |
(uint) (i2 & 0x0000003f));
}
return newKey;
}
/**
* the DES engine.
*/
internal static void DesFunc(
int[] wKey,
byte[] input,
int inOff,
byte[] outBytes,
int outOff)
{
uint left = Pack.BE_To_UInt32(input, inOff);
uint right = Pack.BE_To_UInt32(input, inOff + 4);
uint work;
work = ((left >> 4) ^ right) & 0x0f0f0f0f;
right ^= work;
left ^= (work << 4);
work = ((left >> 16) ^ right) & 0x0000ffff;
right ^= work;
left ^= (work << 16);
work = ((right >> 2) ^ left) & 0x33333333;
left ^= work;
right ^= (work << 2);
work = ((right >> 8) ^ left) & 0x00ff00ff;
left ^= work;
right ^= (work << 8);
right = (right << 1) | (right >> 31);
work = (left ^ right) & 0xaaaaaaaa;
left ^= work;
right ^= work;
left = (left << 1) | (left >> 31);
for (int round = 0; round < 8; round++)
{
uint fval;
work = (right << 28) | (right >> 4);
work ^= (uint)wKey[round * 4 + 0];
fval = SP7[work & 0x3f];
fval |= SP5[(work >> 8) & 0x3f];
fval |= SP3[(work >> 16) & 0x3f];
fval |= SP1[(work >> 24) & 0x3f];
work = right ^ (uint)wKey[round * 4 + 1];
fval |= SP8[ work & 0x3f];
fval |= SP6[(work >> 8) & 0x3f];
fval |= SP4[(work >> 16) & 0x3f];
fval |= SP2[(work >> 24) & 0x3f];
left ^= fval;
work = (left << 28) | (left >> 4);
work ^= (uint)wKey[round * 4 + 2];
fval = SP7[ work & 0x3f];
fval |= SP5[(work >> 8) & 0x3f];
fval |= SP3[(work >> 16) & 0x3f];
fval |= SP1[(work >> 24) & 0x3f];
work = left ^ (uint)wKey[round * 4 + 3];
fval |= SP8[ work & 0x3f];
fval |= SP6[(work >> 8) & 0x3f];
fval |= SP4[(work >> 16) & 0x3f];
fval |= SP2[(work >> 24) & 0x3f];
right ^= fval;
}
right = (right << 31) | (right >> 1);
work = (left ^ right) & 0xaaaaaaaa;
left ^= work;
right ^= work;
left = (left << 31) | (left >> 1);
work = ((left >> 8) ^ right) & 0x00ff00ff;
right ^= work;
left ^= (work << 8);
work = ((left >> 2) ^ right) & 0x33333333;
right ^= work;
left ^= (work << 2);
work = ((right >> 16) ^ left) & 0x0000ffff;
left ^= work;
right ^= (work << 16);
work = ((right >> 4) ^ left) & 0x0f0f0f0f;
left ^= work;
right ^= (work << 4);
Pack.UInt32_To_BE(right, outBytes, outOff);
Pack.UInt32_To_BE(left, outBytes, outOff + 4);
}
}
}
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