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com.bugvm.bouncycastle.crypto.engines.DESEngine Maven / Gradle / Ivy
package com.bugvm.bouncycastle.crypto.engines;
import com.bugvm.bouncycastle.crypto.BlockCipher;
import com.bugvm.bouncycastle.crypto.CipherParameters;
import com.bugvm.bouncycastle.crypto.DataLengthException;
import com.bugvm.bouncycastle.crypto.OutputLengthException;
import com.bugvm.bouncycastle.crypto.params.KeyParameter;
/**
* a class that provides a basic DES engine.
*/
public class DESEngine
implements BlockCipher
{
protected static final int BLOCK_SIZE = 8;
private int[] workingKey = null;
/**
* standard constructor.
*/
public DESEngine()
{
}
/**
* initialise a DES cipher.
*
* @param encrypting whether or not we are for encryption.
* @param params the parameters required to set up the cipher.
* @exception IllegalArgumentException if the params argument is
* inappropriate.
*/
public void init(
boolean encrypting,
CipherParameters params)
{
if (params instanceof KeyParameter)
{
if (((KeyParameter)params).getKey().length > 8)
{
throw new IllegalArgumentException("DES key too long - should be 8 bytes");
}
workingKey = generateWorkingKey(encrypting,
((KeyParameter)params).getKey());
return;
}
throw new IllegalArgumentException("invalid parameter passed to DES init - " + params.getClass().getName());
}
public String getAlgorithmName()
{
return "DES";
}
public int getBlockSize()
{
return BLOCK_SIZE;
}
public int processBlock(
byte[] in,
int inOff,
byte[] out,
int outOff)
{
if (workingKey == null)
{
throw new IllegalStateException("DES engine not initialised");
}
if ((inOff + BLOCK_SIZE) > in.length)
{
throw new DataLengthException("input buffer too short");
}
if ((outOff + BLOCK_SIZE) > out.length)
{
throw new OutputLengthException("output buffer too short");
}
desFunc(workingKey, in, inOff, out, outOff);
return BLOCK_SIZE;
}
public 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 final 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 final short[] bytebit =
{
0200, 0100, 040, 020, 010, 04, 02, 01
};
private static final 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 final 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 final byte[] totrot =
{
1, 2, 4, 6, 8, 10, 12, 14,
15, 17, 19, 21, 23, 25, 27, 28
};
private static final 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 final int[] 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 final int[] 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 final int[] 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 final int[] 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 final int[] 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 final int[] 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 final int[] 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 final int[] 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 & Phil Karn.
* (whoever, and wherever they are!).
*/
protected int[] generateWorkingKey(
boolean encrypting,
byte[] key)
{
int[] newKey = new int[32];
boolean[] pc1m = new boolean[56],
pcr = new boolean[56];
for (int j = 0; j < 56; j++)
{
int l = pc1[j];
pc1m[j] = ((key[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] = ((i1 & 0x00fc0000) << 6) | ((i1 & 0x00000fc0) << 10)
| ((i2 & 0x00fc0000) >>> 10) | ((i2 & 0x00000fc0) >>> 6);
newKey[i + 1] = ((i1 & 0x0003f000) << 12) | ((i1 & 0x0000003f) << 16)
| ((i2 & 0x0003f000) >>> 4) | (i2 & 0x0000003f);
}
return newKey;
}
/**
* the DES engine.
*/
protected void desFunc(
int[] wKey,
byte[] in,
int inOff,
byte[] out,
int outOff)
{
int work, right, left;
left = (in[inOff + 0] & 0xff) << 24;
left |= (in[inOff + 1] & 0xff) << 16;
left |= (in[inOff + 2] & 0xff) << 8;
left |= (in[inOff + 3] & 0xff);
right = (in[inOff + 4] & 0xff) << 24;
right |= (in[inOff + 5] & 0xff) << 16;
right |= (in[inOff + 6] & 0xff) << 8;
right |= (in[inOff + 7] & 0xff);
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) & 1)) & 0xffffffff;
work = (left ^ right) & 0xaaaaaaaa;
left ^= work;
right ^= work;
left = ((left << 1) | ((left >>> 31) & 1)) & 0xffffffff;
for (int round = 0; round < 8; round++)
{
int fval;
work = (right << 28) | (right >>> 4);
work ^= 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 ^ 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 ^= 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 ^ 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);
out[outOff + 0] = (byte)((right >>> 24) & 0xff);
out[outOff + 1] = (byte)((right >>> 16) & 0xff);
out[outOff + 2] = (byte)((right >>> 8) & 0xff);
out[outOff + 3] = (byte)(right & 0xff);
out[outOff + 4] = (byte)((left >>> 24) & 0xff);
out[outOff + 5] = (byte)((left >>> 16) & 0xff);
out[outOff + 6] = (byte)((left >>> 8) & 0xff);
out[outOff + 7] = (byte)(left & 0xff);
}
}
