📄 desengine.java
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// Decompiled by Jad v1.5.7g. Copyright 2000 Pavel Kouznetsov.
// Jad home page: http://www.geocities.com/SiliconValley/Bridge/8617/jad.html
// Decompiler options: packimports(3) fieldsfirst ansi
// Source File Name: DESEngine.java
package jit.crypto.engines;
import jit.crypto.*;
import jit.crypto.params.KeyParameter;
public class DESEngine
implements BlockCipher
{
protected static final int BLOCK_SIZE = 8;
private int workingKey[];
static short Df_Key[] = {
1, 35, 69, 103, 137, 171, 205, 239, 254, 220,
186, 152, 118, 84, 50, 16, 137, 171, 205, 239,
1, 35, 69, 103
};
static short bytebit[] = {
128, 64, 32, 16, 8, 4, 2, 1
};
static int bigbyte[] = {
0x800000, 0x400000, 0x200000, 0x100000, 0x80000, 0x40000, 0x20000, 0x10000, 32768, 16384,
8192, 4096, 2048, 1024, 512, 256, 128, 64, 32, 16,
8, 4, 2, 1
};
static 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
};
static byte totrot[] = {
1, 2, 4, 6, 8, 10, 12, 14, 15, 17,
19, 21, 23, 25, 27, 28
};
static 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
};
static int SP1[] = {
0x1010400, 0, 0x10000, 0x1010404, 0x1010004, 0x10404, 4, 0x10000, 1024, 0x1010400,
0x1010404, 1024, 0x1000404, 0x1010004, 0x1000000, 4, 1028, 0x1000400, 0x1000400, 0x10400,
0x10400, 0x1010000, 0x1010000, 0x1000404, 0x10004, 0x1000004, 0x1000004, 0x10004, 0, 1028,
0x10404, 0x1000000, 0x10000, 0x1010404, 4, 0x1010000, 0x1010400, 0x1000000, 0x1000000, 1024,
0x1010004, 0x10000, 0x10400, 0x1000004, 1024, 4, 0x1000404, 0x10404, 0x1010404, 0x10004,
0x1010000, 0x1000404, 0x1000004, 1028, 0x10404, 0x1010400, 1028, 0x1000400, 0x1000400, 0,
0x10004, 0x10400, 0, 0x1010004
};
static int SP2[] = {
0x80108020, 0x80008000, 32768, 0x108020, 0x100000, 32, 0x80100020, 0x80008020, 0x80000020, 0x80108020,
0x80108000, 0x80000000, 0x80008000, 0x100000, 32, 0x80100020, 0x108000, 0x100020, 0x80008020, 0,
0x80000000, 32768, 0x108020, 0x80100000, 0x100020, 0x80000020, 0, 0x108000, 32800, 0x80108000,
0x80100000, 32800, 0, 0x108020, 0x80100020, 0x100000, 0x80008020, 0x80100000, 0x80108000, 32768,
0x80100000, 0x80008000, 32, 0x80108020, 0x108020, 32, 32768, 0x80000000, 32800, 0x80108000,
0x100000, 0x80000020, 0x100020, 0x80008020, 0x80000020, 0x100020, 0x108000, 0, 0x80008000, 32800,
0x80000000, 0x80100020, 0x80108020, 0x108000
};
static int SP3[] = {
520, 0x8020200, 0, 0x8020008, 0x8000200, 0, 0x20208, 0x8000200, 0x20008, 0x8000008,
0x8000008, 0x20000, 0x8020208, 0x20008, 0x8020000, 520, 0x8000000, 8, 0x8020200, 512,
0x20200, 0x8020000, 0x8020008, 0x20208, 0x8000208, 0x20200, 0x20000, 0x8000208, 8, 0x8020208,
512, 0x8000000, 0x8020200, 0x8000000, 0x20008, 520, 0x20000, 0x8020200, 0x8000200, 0,
512, 0x20008, 0x8020208, 0x8000200, 0x8000008, 512, 0, 0x8020008, 0x8000208, 0x20000,
0x8000000, 0x8020208, 8, 0x20208, 0x20200, 0x8000008, 0x8020000, 0x8000208, 520, 0x8020000,
0x20208, 8, 0x8020008, 0x20200
};
static int SP4[] = {
0x802001, 8321, 8321, 128, 0x802080, 0x800081, 0x800001, 8193, 0, 0x802000,
0x802000, 0x802081, 129, 0, 0x800080, 0x800001, 1, 8192, 0x800000, 0x802001,
128, 0x800000, 8193, 8320, 0x800081, 1, 8320, 0x800080, 8192, 0x802080,
0x802081, 129, 0x800080, 0x800001, 0x802000, 0x802081, 129, 0, 0, 0x802000,
8320, 0x800080, 0x800081, 1, 0x802001, 8321, 8321, 128, 0x802081, 129,
1, 8192, 0x800001, 8193, 0x802080, 0x800081, 8193, 8320, 0x800000, 0x802001,
128, 0x800000, 8192, 0x802080
};
static int SP5[] = {
256, 0x2080100, 0x2080000, 0x42000100, 0x80000, 256, 0x40000000, 0x2080000, 0x40080100, 0x80000,
0x2000100, 0x40080100, 0x42000100, 0x42080000, 0x80100, 0x40000000, 0x2000000, 0x40080000, 0x40080000, 0,
0x40000100, 0x42080100, 0x42080100, 0x2000100, 0x42080000, 0x40000100, 0, 0x42000000, 0x2080100, 0x2000000,
0x42000000, 0x80100, 0x80000, 0x42000100, 256, 0x2000000, 0x40000000, 0x2080000, 0x42000100, 0x40080100,
0x2000100, 0x40000000, 0x42080000, 0x2080100, 0x40080100, 256, 0x2000000, 0x42080000, 0x42080100, 0x80100,
0x42000000, 0x42080100, 0x2080000, 0, 0x40080000, 0x42000000, 0x80100, 0x2000100, 0x40000100, 0x80000,
0, 0x40080000, 0x2080100, 0x40000100
};
static int SP6[] = {
0x20000010, 0x20400000, 16384, 0x20404010, 0x20400000, 16, 0x20404010, 0x400000, 0x20004000, 0x404010,
0x400000, 0x20000010, 0x400010, 0x20004000, 0x20000000, 16400, 0, 0x400010, 0x20004010, 16384,
0x404000, 0x20004010, 16, 0x20400010, 0x20400010, 0, 0x404010, 0x20404000, 16400, 0x404000,
0x20404000, 0x20000000, 0x20004000, 16, 0x20400010, 0x404000, 0x20404010, 0x400000, 16400, 0x20000010,
0x400000, 0x20004000, 0x20000000, 16400, 0x20000010, 0x20404010, 0x404000, 0x20400000, 0x404010, 0x20404000,
0, 0x20400010, 16, 16384, 0x20400000, 0x404010, 16384, 0x400010, 0x20004010, 0,
0x20404000, 0x20000000, 0x400010, 0x20004010
};
static int SP7[] = {
0x200000, 0x4200002, 0x4000802, 0, 2048, 0x4000802, 0x200802, 0x4200800, 0x4200802, 0x200000,
0, 0x4000002, 2, 0x4000000, 0x4200002, 2050, 0x4000800, 0x200802, 0x200002, 0x4000800,
0x4000002, 0x4200000, 0x4200800, 0x200002, 0x4200000, 2048, 2050, 0x4200802, 0x200800, 2,
0x4000000, 0x200800, 0x4000000, 0x200800, 0x200000, 0x4000802, 0x4000802, 0x4200002, 0x4200002, 2,
0x200002, 0x4000000, 0x4000800, 0x200000, 0x4200800, 2050, 0x200802, 0x4200800, 2050, 0x4000002,
0x4200802, 0x4200000, 0x200800, 0, 2, 0x4200802, 0, 0x200802, 0x4200000, 2048,
0x4000002, 0x4000800, 2048, 0x200002
};
static int SP8[] = {
0x10001040, 4096, 0x40000, 0x10041040, 0x10000000, 0x10001040, 64, 0x10000000, 0x40040, 0x10040000,
0x10041040, 0x41000, 0x10041000, 0x41040, 4096, 64, 0x10040000, 0x10000040, 0x10001000, 4160,
0x41000, 0x40040, 0x10040040, 0x10041000, 4160, 0, 0, 0x10040040, 0x10000040, 0x10001000,
0x41040, 0x40000, 0x41040, 0x40000, 0x10041000, 4096, 64, 0x10040040, 4096, 0x41040,
0x10001000, 64, 0x10000040, 0x10040000, 0x10040040, 0x10000000, 0x40000, 0x10001040, 0, 0x10041040,
0x40040, 0x10000040, 0x10040000, 0x10001000, 0x10001040, 0, 0x10041040, 0x41000, 0x41000, 4160,
4160, 0x40040, 0x10000000, 0x10041000
};
public DESEngine()
{
workingKey = null;
}
public void init(boolean encrypting, CipherParameters params)
{
if(params instanceof KeyParameter)
{
workingKey = generateWorkingKey(encrypting, ((KeyParameter)params).getKey());
return;
} else
{
throw new IllegalArgumentException("invalid parameter passed to DES init - ".concat(String.valueOf(String.valueOf(params.getClass().getName()))));
}
}
public String getAlgorithmName()
{
return "DES";
}
public int getBlockSize()
{
return 8;
}
public int processBlock(byte in[], int inOff, byte out[], int outOff)
{
if(workingKey == null)
throw new IllegalStateException("DES engine not initialised");
if(inOff + 8 > in.length)
throw new DataLengthException("input buffer too short");
if(outOff + 8 > out.length)
{
throw new DataLengthException("output buffer too short");
} else
{
desFunc(workingKey, in, inOff, out, outOff);
return 8;
}
}
public void reset()
{
}
protected int[] generateWorkingKey(boolean encrypting, byte key[])
{
int newKey[] = new int[32];
boolean pc1m[] = new boolean[56];
boolean pcr[] = new boolean[56];
for(int j = 0; j < 56; j++)
{
int l = pc1[j];
pc1m[j] = (key[l >>> 3] & bytebit[l & 0x7]) != 0;
}
for(int i = 0; i < 16; i++)
{
int m;
if(encrypting)
m = i << 1;
else
m = 15 - i << 1;
int n = m + 1;
newKey[m] = newKey[n] = 0;
for(int j = 0; j < 28; j++)
{
int l = j + totrot[i];
if(l < 28)
pcr[j] = pc1m[l];
else
pcr[j] = pc1m[l - 28];
}
for(int j = 28; j < 56; j++)
{
int 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];
}
}
for(int i = 0; i != 32; i += 2)
{
int i1 = newKey[i];
int i2 = newKey[i + 1];
newKey[i] = (i1 & 0xfc0000) << 6 | (i1 & 0xfc0) << 10 | (i2 & 0xfc0000) >>> 10 | (i2 & 0xfc0) >>> 6;
newKey[i + 1] = (i1 & 0x3f000) << 12 | (i1 & 0x3f) << 16 | (i2 & 0x3f000) >>> 4 | i2 & 0x3f;
}
return newKey;
}
protected void desFunc(int wKey[], byte in[], int inOff, byte out[], int outOff)
{
int left = (in[inOff + 0] & 0xff) << 24;
left |= (in[inOff + 1] & 0xff) << 16;
left |= (in[inOff + 2] & 0xff) << 8;
left |= in[inOff + 3] & 0xff;
int right = (in[inOff + 4] & 0xff) << 24;
right |= (in[inOff + 5] & 0xff) << 16;
right |= (in[inOff + 6] & 0xff) << 8;
right |= in[inOff + 7] & 0xff;
int work = (left >>> 4 ^ right) & 0xf0f0f0f;
right ^= work;
left ^= work << 4;
work = (left >>> 16 ^ right) & 0xffff;
right ^= work;
left ^= work << 16;
work = (right >>> 2 ^ left) & 0x33333333;
left ^= work;
right ^= work << 2;
work = (right >>> 8 ^ left) & 0xff00ff;
left ^= work;
right ^= work << 8;
right = (right << 1 | right >>> 31 & 0x1) & 0xffffffff;
work = (left ^ right) & 0xaaaaaaaa;
left ^= work;
right ^= work;
left = (left << 1 | left >>> 31 & 0x1) & 0xffffffff;
for(int round = 0; round < 8; round++)
{
work = right << 28 | right >>> 4;
work ^= wKey[round * 4 + 0];
int 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) & 0xff00ff;
right ^= work;
left ^= work << 8;
work = (left >>> 2 ^ right) & 0x33333333;
right ^= work;
left ^= work << 2;
work = (right >>> 16 ^ left) & 0xffff;
left ^= work;
right ^= work << 16;
work = (right >>> 4 ^ left) & 0xf0f0f0f;
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);
}
static
{
BLOCK_SIZE = 8;
}
}
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