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crypt_des.c
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crypt_des.c
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/*
* Copyright 2004 Hans Leidekker
* Copyright 2006 Mike McCormack
*
* Based on DES.c from libcifs
*
* Copyright (C) 2003, 2004 by Christopher R. Hertel
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "windef.h"
#include "crypt.h"
static const unsigned char InitialPermuteMap[64] =
{
57, 49, 41, 33, 25, 17, 9, 1,
59, 51, 43, 35, 27, 19, 11, 3,
61, 53, 45, 37, 29, 21, 13, 5,
63, 55, 47, 39, 31, 23, 15, 7,
56, 48, 40, 32, 24, 16, 8, 0,
58, 50, 42, 34, 26, 18, 10, 2,
60, 52, 44, 36, 28, 20, 12, 4,
62, 54, 46, 38, 30, 22, 14, 6
};
static const unsigned char KeyPermuteMap[56] =
{
49, 42, 35, 28, 21, 14, 7, 0,
50, 43, 36, 29, 22, 15, 8, 1,
51, 44, 37, 30, 23, 16, 9, 2,
52, 45, 38, 31, 55, 48, 41, 34,
27, 20, 13, 6, 54, 47, 40, 33,
26, 19, 12, 5, 53, 46, 39, 32,
25, 18, 11, 4, 24, 17, 10, 3,
};
static const unsigned char KeyRotation[16] =
{ 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1 };
static const unsigned char KeyCompression[48] =
{
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 const unsigned char DataExpansion[48] =
{
31, 0, 1, 2, 3, 4, 3, 4,
5, 6, 7, 8, 7, 8, 9, 10,
11, 12, 11, 12, 13, 14, 15, 16,
15, 16, 17, 18, 19, 20, 19, 20,
21, 22, 23, 24, 23, 24, 25, 26,
27, 28, 27, 28, 29, 30, 31, 0
};
static const unsigned char SBox[8][64] =
{
{ /* S0 */
14, 0, 4, 15, 13, 7, 1, 4, 2, 14, 15, 2, 11, 13, 8, 1,
3, 10, 10, 6, 6, 12, 12, 11, 5, 9, 9, 5, 0, 3, 7, 8,
4, 15, 1, 12, 14, 8, 8, 2, 13, 4, 6, 9, 2, 1, 11, 7,
15, 5, 12, 11, 9, 3, 7, 14, 3, 10, 10, 0, 5, 6, 0, 13
},
{ /* S1 */
15, 3, 1, 13, 8, 4, 14, 7, 6, 15, 11, 2, 3, 8, 4, 14,
9, 12, 7, 0, 2, 1, 13, 10, 12, 6, 0, 9, 5, 11, 10, 5,
0, 13, 14, 8, 7, 10, 11, 1, 10, 3, 4, 15, 13, 4, 1, 2,
5, 11, 8, 6, 12, 7, 6, 12, 9, 0, 3, 5, 2, 14, 15, 9
},
{ /* S2 */
10, 13, 0, 7, 9, 0, 14, 9, 6, 3, 3, 4, 15, 6, 5, 10,
1, 2, 13, 8, 12, 5, 7, 14, 11, 12, 4, 11, 2, 15, 8, 1,
13, 1, 6, 10, 4, 13, 9, 0, 8, 6, 15, 9, 3, 8, 0, 7,
11, 4, 1, 15, 2, 14, 12, 3, 5, 11, 10, 5, 14, 2, 7, 12
},
{ /* S3 */
7, 13, 13, 8, 14, 11, 3, 5, 0, 6, 6, 15, 9, 0, 10, 3,
1, 4, 2, 7, 8, 2, 5, 12, 11, 1, 12, 10, 4, 14, 15, 9,
10, 3, 6, 15, 9, 0, 0, 6, 12, 10, 11, 1, 7, 13, 13, 8,
15, 9, 1, 4, 3, 5, 14, 11, 5, 12, 2, 7, 8, 2, 4, 14
},
{ /* S4 */
2, 14, 12, 11, 4, 2, 1, 12, 7, 4, 10, 7, 11, 13, 6, 1,
8, 5, 5, 0, 3, 15, 15, 10, 13, 3, 0, 9, 14, 8, 9, 6,
4, 11, 2, 8, 1, 12, 11, 7, 10, 1, 13, 14, 7, 2, 8, 13,
15, 6, 9, 15, 12, 0, 5, 9, 6, 10, 3, 4, 0, 5, 14, 3
},
{ /* S5 */
12, 10, 1, 15, 10, 4, 15, 2, 9, 7, 2, 12, 6, 9, 8, 5,
0, 6, 13, 1, 3, 13, 4, 14, 14, 0, 7, 11, 5, 3, 11, 8,
9, 4, 14, 3, 15, 2, 5, 12, 2, 9, 8, 5, 12, 15, 3, 10,
7, 11, 0, 14, 4, 1, 10, 7, 1, 6, 13, 0, 11, 8, 6, 13
},
{ /* S6 */
4, 13, 11, 0, 2, 11, 14, 7, 15, 4, 0, 9, 8, 1, 13, 10,
3, 14, 12, 3, 9, 5, 7, 12, 5, 2, 10, 15, 6, 8, 1, 6,
1, 6, 4, 11, 11, 13, 13, 8, 12, 1, 3, 4, 7, 10, 14, 7,
10, 9, 15, 5, 6, 0, 8, 15, 0, 14, 5, 2, 9, 3, 2, 12
},
{ /* S7 */
13, 1, 2, 15, 8, 13, 4, 8, 6, 10, 15, 3, 11, 7, 1, 4,
10, 12, 9, 5, 3, 6, 14, 11, 5, 0, 0, 14, 12, 9, 7, 2,
7, 2, 11, 1, 4, 14, 1, 7, 9, 4, 12, 10, 14, 8, 2, 13,
0, 15, 6, 12, 10, 9, 13, 0, 15, 3, 3, 5, 5, 6, 8, 11
}
};
static const unsigned char PBox[32] =
{
15, 6, 19, 20, 28, 11, 27, 16,
0, 14, 22, 25, 4, 17, 30, 9,
1, 7, 23, 13, 31, 26, 2, 8,
18, 12, 29, 5, 21, 10, 3, 24
};
static const unsigned char FinalPermuteMap[64] =
{
7, 39, 15, 47, 23, 55, 31, 63,
6, 38, 14, 46, 22, 54, 30, 62,
5, 37, 13, 45, 21, 53, 29, 61,
4, 36, 12, 44, 20, 52, 28, 60,
3, 35, 11, 43, 19, 51, 27, 59,
2, 34, 10, 42, 18, 50, 26, 58,
1, 33, 9, 41, 17, 49, 25, 57,
0, 32, 8, 40, 16, 48, 24, 56
};
#define CLRBIT( STR, IDX ) ( (STR)[(IDX)/8] &= ~(0x01 << (7 - ((IDX)%8))) )
#define SETBIT( STR, IDX ) ( (STR)[(IDX)/8] |= (0x01 << (7 - ((IDX)%8))) )
#define GETBIT( STR, IDX ) (( ((STR)[(IDX)/8]) >> (7 - ((IDX)%8)) ) & 0x01)
static void Permute( unsigned char *dst, const unsigned char *src, const unsigned char *map, const int mapsize )
{
int bitcount, i;
for (i = 0; i < mapsize; i++)
dst[i] = 0;
bitcount = mapsize * 8;
for (i = 0; i < bitcount; i++)
{
if (GETBIT( src, map[i] ))
SETBIT( dst, i );
}
}
static void KeyShiftLeft( unsigned char *key, const int numbits )
{
int i;
unsigned char keep = key[0];
for (i = 0; i < numbits; i++)
{
int j;
for (j = 0; j < 7; j++)
{
if (j && (key[j] & 0x80))
key[j-1] |= 0x01;
key[j] <<= 1;
}
if (GETBIT( key, 27 ))
{
CLRBIT( key, 27 );
SETBIT( key, 55 );
}
if (keep & 0x80)
SETBIT( key, 27 );
keep <<= 1;
}
}
static void KeyShiftRight( unsigned char *key, const int numbits )
{
int i;
unsigned char keep = key[6];
for (i = 0; i < numbits; i++)
{
int j;
for (j = 6; j >= 0; j--)
{
if (j!=6 && (key[j] & 0x01))
key[j+1] |= 0x80;
key[j] >>= 1;
}
if (GETBIT( key, 28 ))
{
CLRBIT( key, 28 );
SETBIT( key, 0 );
}
if (keep & 0x01)
SETBIT( key, 28 );
keep >>= 1;
}
}
static void sbox( unsigned char *dst, const unsigned char *src )
{
int i;
for (i = 0; i < 4; i++)
dst[i] = 0;
for (i = 0; i < 8; i++)
{
int j, Snum, bitnum;
for (Snum = j = 0, bitnum = (i * 6); j < 6; j++, bitnum++)
{
Snum <<= 1;
Snum |= GETBIT( src, bitnum );
}
if (0 == (i%2))
dst[i/2] |= ((SBox[i][Snum]) << 4);
else
dst[i/2] |= SBox[i][Snum];
}
}
static void xor( unsigned char *dst, const unsigned char *a, const unsigned char *b, const int count )
{
int i;
for (i = 0; i < count; i++)
dst[i] = a[i] ^ b[i];
}
unsigned char *CRYPT_DEShash( unsigned char *dst, const unsigned char *key, const unsigned char *src )
{
int i;
unsigned char K[7];
unsigned char D[8];
Permute( K, key, KeyPermuteMap, 7 );
Permute( D, src, InitialPermuteMap, 8 );
for (i = 0; i < 16; i++)
{
int j;
unsigned char *L = D;
unsigned char *R = &(D[4]);
unsigned char Rexp[6];
unsigned char Rn[4];
unsigned char SubK[6];
KeyShiftLeft( K, KeyRotation[i] );
Permute( SubK, K, KeyCompression, 6 );
Permute( Rexp, R, DataExpansion, 6 );
xor( Rexp, Rexp, SubK, 6 );
sbox( Rn, Rexp );
Permute( Rexp, Rn, PBox, 4 );
xor( Rn, L, Rexp, 4 );
for (j = 0; j < 4; j++)
{
L[j] = R[j];
R[j] = Rn[j];
}
}
Permute( dst, D, FinalPermuteMap, 8 );
return dst;
}
unsigned char *CRYPT_DESunhash( unsigned char *dst, const unsigned char *key, const unsigned char *src )
{
int i;
unsigned char K[7];
unsigned char D[8];
Permute( K, key, KeyPermuteMap, 7 );
Permute( D, src, InitialPermuteMap, 8 );
for (i = 0; i < 16; i++)
{
int j;
unsigned char *L = D;
unsigned char *R = &(D[4]);
unsigned char Rexp[6];
unsigned char Rn[4];
unsigned char SubK[6];
Permute( SubK, K, KeyCompression, 6 );
Permute( Rexp, R, DataExpansion, 6 );
xor( Rexp, Rexp, SubK, 6 );
sbox( Rn, Rexp );
Permute( Rexp, Rn, PBox, 4 );
xor( Rn, L, Rexp, 4 );
for (j = 0; j < 4; j++)
{
L[j] = R[j];
R[j] = Rn[j];
}
KeyShiftRight( K, KeyRotation[15 - i] );
}
Permute( dst, D, FinalPermuteMap, 8 );
return dst;
}