2 * Copyright 2004 Hans Leidekker
3 * Copyright 2006 Mike McCormack
5 * Based on DES.c from libcifs
7 * Copyright (C) 2003, 2004 by Christopher R. Hertel
9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with this library; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
27 static const unsigned char InitialPermuteMap[64] =
29 57, 49, 41, 33, 25, 17, 9, 1,
30 59, 51, 43, 35, 27, 19, 11, 3,
31 61, 53, 45, 37, 29, 21, 13, 5,
32 63, 55, 47, 39, 31, 23, 15, 7,
33 56, 48, 40, 32, 24, 16, 8, 0,
34 58, 50, 42, 34, 26, 18, 10, 2,
35 60, 52, 44, 36, 28, 20, 12, 4,
36 62, 54, 46, 38, 30, 22, 14, 6
39 static const unsigned char KeyPermuteMap[56] =
41 49, 42, 35, 28, 21, 14, 7, 0,
42 50, 43, 36, 29, 22, 15, 8, 1,
43 51, 44, 37, 30, 23, 16, 9, 2,
44 52, 45, 38, 31, 55, 48, 41, 34,
45 27, 20, 13, 6, 54, 47, 40, 33,
46 26, 19, 12, 5, 53, 46, 39, 32,
47 25, 18, 11, 4, 24, 17, 10, 3,
50 static const unsigned char KeyRotation[16] =
51 { 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1 };
53 static const unsigned char KeyCompression[48] =
55 13, 16, 10, 23, 0, 4, 2, 27,
56 14, 5, 20, 9, 22, 18, 11, 3,
57 25, 7, 15, 6, 26, 19, 12, 1,
58 40, 51, 30, 36, 46, 54, 29, 39,
59 50, 44, 32, 47, 43, 48, 38, 55,
60 33, 52, 45, 41, 49, 35, 28, 31
63 static const unsigned char DataExpansion[48] =
65 31, 0, 1, 2, 3, 4, 3, 4,
66 5, 6, 7, 8, 7, 8, 9, 10,
67 11, 12, 11, 12, 13, 14, 15, 16,
68 15, 16, 17, 18, 19, 20, 19, 20,
69 21, 22, 23, 24, 23, 24, 25, 26,
70 27, 28, 27, 28, 29, 30, 31, 0
73 static const unsigned char SBox[8][64] =
76 14, 0, 4, 15, 13, 7, 1, 4, 2, 14, 15, 2, 11, 13, 8, 1,
77 3, 10, 10, 6, 6, 12, 12, 11, 5, 9, 9, 5, 0, 3, 7, 8,
78 4, 15, 1, 12, 14, 8, 8, 2, 13, 4, 6, 9, 2, 1, 11, 7,
79 15, 5, 12, 11, 9, 3, 7, 14, 3, 10, 10, 0, 5, 6, 0, 13
82 15, 3, 1, 13, 8, 4, 14, 7, 6, 15, 11, 2, 3, 8, 4, 14,
83 9, 12, 7, 0, 2, 1, 13, 10, 12, 6, 0, 9, 5, 11, 10, 5,
84 0, 13, 14, 8, 7, 10, 11, 1, 10, 3, 4, 15, 13, 4, 1, 2,
85 5, 11, 8, 6, 12, 7, 6, 12, 9, 0, 3, 5, 2, 14, 15, 9
88 10, 13, 0, 7, 9, 0, 14, 9, 6, 3, 3, 4, 15, 6, 5, 10,
89 1, 2, 13, 8, 12, 5, 7, 14, 11, 12, 4, 11, 2, 15, 8, 1,
90 13, 1, 6, 10, 4, 13, 9, 0, 8, 6, 15, 9, 3, 8, 0, 7,
91 11, 4, 1, 15, 2, 14, 12, 3, 5, 11, 10, 5, 14, 2, 7, 12
94 7, 13, 13, 8, 14, 11, 3, 5, 0, 6, 6, 15, 9, 0, 10, 3,
95 1, 4, 2, 7, 8, 2, 5, 12, 11, 1, 12, 10, 4, 14, 15, 9,
96 10, 3, 6, 15, 9, 0, 0, 6, 12, 10, 11, 1, 7, 13, 13, 8,
97 15, 9, 1, 4, 3, 5, 14, 11, 5, 12, 2, 7, 8, 2, 4, 14
100 2, 14, 12, 11, 4, 2, 1, 12, 7, 4, 10, 7, 11, 13, 6, 1,
101 8, 5, 5, 0, 3, 15, 15, 10, 13, 3, 0, 9, 14, 8, 9, 6,
102 4, 11, 2, 8, 1, 12, 11, 7, 10, 1, 13, 14, 7, 2, 8, 13,
103 15, 6, 9, 15, 12, 0, 5, 9, 6, 10, 3, 4, 0, 5, 14, 3
106 12, 10, 1, 15, 10, 4, 15, 2, 9, 7, 2, 12, 6, 9, 8, 5,
107 0, 6, 13, 1, 3, 13, 4, 14, 14, 0, 7, 11, 5, 3, 11, 8,
108 9, 4, 14, 3, 15, 2, 5, 12, 2, 9, 8, 5, 12, 15, 3, 10,
109 7, 11, 0, 14, 4, 1, 10, 7, 1, 6, 13, 0, 11, 8, 6, 13
112 4, 13, 11, 0, 2, 11, 14, 7, 15, 4, 0, 9, 8, 1, 13, 10,
113 3, 14, 12, 3, 9, 5, 7, 12, 5, 2, 10, 15, 6, 8, 1, 6,
114 1, 6, 4, 11, 11, 13, 13, 8, 12, 1, 3, 4, 7, 10, 14, 7,
115 10, 9, 15, 5, 6, 0, 8, 15, 0, 14, 5, 2, 9, 3, 2, 12
118 13, 1, 2, 15, 8, 13, 4, 8, 6, 10, 15, 3, 11, 7, 1, 4,
119 10, 12, 9, 5, 3, 6, 14, 11, 5, 0, 0, 14, 12, 9, 7, 2,
120 7, 2, 11, 1, 4, 14, 1, 7, 9, 4, 12, 10, 14, 8, 2, 13,
121 0, 15, 6, 12, 10, 9, 13, 0, 15, 3, 3, 5, 5, 6, 8, 11
125 static const unsigned char PBox[32] =
127 15, 6, 19, 20, 28, 11, 27, 16,
128 0, 14, 22, 25, 4, 17, 30, 9,
129 1, 7, 23, 13, 31, 26, 2, 8,
130 18, 12, 29, 5, 21, 10, 3, 24
133 static const unsigned char FinalPermuteMap[64] =
135 7, 39, 15, 47, 23, 55, 31, 63,
136 6, 38, 14, 46, 22, 54, 30, 62,
137 5, 37, 13, 45, 21, 53, 29, 61,
138 4, 36, 12, 44, 20, 52, 28, 60,
139 3, 35, 11, 43, 19, 51, 27, 59,
140 2, 34, 10, 42, 18, 50, 26, 58,
141 1, 33, 9, 41, 17, 49, 25, 57,
142 0, 32, 8, 40, 16, 48, 24, 56
145 #define CLRBIT( STR, IDX ) ( (STR)[(IDX)/8] &= ~(0x01 << (7 - ((IDX)%8))) )
146 #define SETBIT( STR, IDX ) ( (STR)[(IDX)/8] |= (0x01 << (7 - ((IDX)%8))) )
147 #define GETBIT( STR, IDX ) (( ((STR)[(IDX)/8]) >> (7 - ((IDX)%8)) ) & 0x01)
149 static void Permute( unsigned char *dst, const unsigned char *src, const unsigned char *map, const int mapsize )
153 for (i = 0; i < mapsize; i++)
156 bitcount = mapsize * 8;
158 for (i = 0; i < bitcount; i++)
160 if (GETBIT( src, map[i] ))
165 static void KeyShiftLeft( unsigned char *key, const int numbits )
168 unsigned char keep = key[0];
170 for (i = 0; i < numbits; i++)
174 for (j = 0; j < 7; j++)
176 if (j && (key[j] & 0x80))
181 if (GETBIT( key, 27 ))
194 static void KeyShiftRight( unsigned char *key, const int numbits )
197 unsigned char keep = key[6];
199 for (i = 0; i < numbits; i++)
203 for (j = 6; j >= 0; j--)
205 if (j!=6 && (key[j] & 0x01))
210 if (GETBIT( key, 28 ))
223 static void sbox( unsigned char *dst, const unsigned char *src )
227 for (i = 0; i < 4; i++)
230 for (i = 0; i < 8; i++)
234 for (Snum = j = 0, bitnum = (i * 6); j < 6; j++, bitnum++)
237 Snum |= GETBIT( src, bitnum );
241 dst[i/2] |= ((SBox[i][Snum]) << 4);
243 dst[i/2] |= SBox[i][Snum];
247 static void xor( unsigned char *dst, const unsigned char *a, const unsigned char *b, const int count )
251 for (i = 0; i < count; i++)
252 dst[i] = a[i] ^ b[i];
255 unsigned char *CRYPT_DEShash( unsigned char *dst, const unsigned char *key, const unsigned char *src )
261 Permute( K, key, KeyPermuteMap, 7 );
262 Permute( D, src, InitialPermuteMap, 8 );
264 for (i = 0; i < 16; i++)
267 unsigned char *L = D;
268 unsigned char *R = &(D[4]);
269 unsigned char Rexp[6];
271 unsigned char SubK[6];
273 KeyShiftLeft( K, KeyRotation[i] );
274 Permute( SubK, K, KeyCompression, 6 );
276 Permute( Rexp, R, DataExpansion, 6 );
277 xor( Rexp, Rexp, SubK, 6 );
280 Permute( Rexp, Rn, PBox, 4 );
281 xor( Rn, L, Rexp, 4 );
283 for (j = 0; j < 4; j++)
290 Permute( dst, D, FinalPermuteMap, 8 );
295 unsigned char *CRYPT_DESunhash( unsigned char *dst, const unsigned char *key, const unsigned char *src )
301 Permute( K, key, KeyPermuteMap, 7 );
302 Permute( D, src, InitialPermuteMap, 8 );
304 for (i = 0; i < 16; i++)
307 unsigned char *L = D;
308 unsigned char *R = &(D[4]);
309 unsigned char Rexp[6];
311 unsigned char SubK[6];
313 Permute( SubK, K, KeyCompression, 6 );
315 Permute( Rexp, R, DataExpansion, 6 );
316 xor( Rexp, Rexp, SubK, 6 );
319 Permute( Rexp, Rn, PBox, 4 );
320 xor( Rn, L, Rexp, 4 );
322 for (j = 0; j < 4; j++)
328 KeyShiftRight( K, KeyRotation[15 - i] );
331 Permute( dst, D, FinalPermuteMap, 8 );