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Remove some unnecessary casts.
[dragonfly.git] / contrib / wpa_supplicant-0.5.8 / des.c
blob8e0d56fc6af1d74264135d74879b1770b1fe1274
1 /*
2 * DES and 3DES-EDE ciphers
3 *
4 * Modifications to LibTomCrypt implementation:
5 * Copyright (c) 2006, Jouni Malinen <j@w1.fi>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * Alternatively, this software may be distributed under the terms of BSD
12 * license.
13 *
14 * See README and COPYING for more details.
15 */
16
17 #include "includes.h"
18
19 #include "common.h"
20 #include "crypto.h"
21
22
23 #ifdef INTERNAL_DES
24
25 /*
26 * This implementation is based on a DES implementation included in
27 * LibTomCrypt. The version here is modified to fit in wpa_supplicant/hostapd
28 * coding style.
29 */
30
31 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
32 *
33 * LibTomCrypt is a library that provides various cryptographic
34 * algorithms in a highly modular and flexible manner.
35 *
36 * The library is free for all purposes without any express
37 * guarantee it works.
38 *
39 * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.com
40 */
41
42 /**
43 DES code submitted by Dobes Vandermeer
44 */
45
46 #define ROLc(x, y) \
47 ((((unsigned long) (x) << (unsigned long) ((y) & 31)) | \
48 (((unsigned long) (x) & 0xFFFFFFFFUL) >> \
49 (unsigned long) (32 - ((y) & 31)))) & 0xFFFFFFFFUL)
50 #define RORc(x, y) \
51 (((((unsigned long) (x) & 0xFFFFFFFFUL) >> \
52 (unsigned long) ((y) & 31)) | \
53 ((unsigned long) (x) << (unsigned long) (32 - ((y) & 31)))) & \
54 0xFFFFFFFFUL)
55
56
57 static const u32 bytebit[8] =
58 {
59 0200, 0100, 040, 020, 010, 04, 02, 01
60 };
61
62 static const u32 bigbyte[24] =
63 {
64 0x800000UL, 0x400000UL, 0x200000UL, 0x100000UL,
65 0x80000UL, 0x40000UL, 0x20000UL, 0x10000UL,
66 0x8000UL, 0x4000UL, 0x2000UL, 0x1000UL,
67 0x800UL, 0x400UL, 0x200UL, 0x100UL,
68 0x80UL, 0x40UL, 0x20UL, 0x10UL,
69 0x8UL, 0x4UL, 0x2UL, 0x1L
70 };
71
72 /* Use the key schedule specific in the standard (ANSI X3.92-1981) */
73
74 static const u8 pc1[56] = {
75 56, 48, 40, 32, 24, 16, 8, 0, 57, 49, 41, 33, 25, 17,
76 9, 1, 58, 50, 42, 34, 26, 18, 10, 2, 59, 51, 43, 35,
77 62, 54, 46, 38, 30, 22, 14, 6, 61, 53, 45, 37, 29, 21,
78 13, 5, 60, 52, 44, 36, 28, 20, 12, 4, 27, 19, 11, 3
79 };
80
81 static const u8 totrot[16] = {
82 1, 2, 4, 6,
83 8, 10, 12, 14,
84 15, 17, 19, 21,
85 23, 25, 27, 28
86 };
87
88 static const u8 pc2[48] = {
89 13, 16, 10, 23, 0, 4, 2, 27, 14, 5, 20, 9,
90 22, 18, 11, 3, 25, 7, 15, 6, 26, 19, 12, 1,
91 40, 51, 30, 36, 46, 54, 29, 39, 50, 44, 32, 47,
92 43, 48, 38, 55, 33, 52, 45, 41, 49, 35, 28, 31
93 };
94
95
96 static const u32 SP1[64] =
97 {
98 0x01010400UL, 0x00000000UL, 0x00010000UL, 0x01010404UL,
99 0x01010004UL, 0x00010404UL, 0x00000004UL, 0x00010000UL,
100 0x00000400UL, 0x01010400UL, 0x01010404UL, 0x00000400UL,
101 0x01000404UL, 0x01010004UL, 0x01000000UL, 0x00000004UL,
102 0x00000404UL, 0x01000400UL, 0x01000400UL, 0x00010400UL,
103 0x00010400UL, 0x01010000UL, 0x01010000UL, 0x01000404UL,
104 0x00010004UL, 0x01000004UL, 0x01000004UL, 0x00010004UL,
105 0x00000000UL, 0x00000404UL, 0x00010404UL, 0x01000000UL,
106 0x00010000UL, 0x01010404UL, 0x00000004UL, 0x01010000UL,
107 0x01010400UL, 0x01000000UL, 0x01000000UL, 0x00000400UL,
108 0x01010004UL, 0x00010000UL, 0x00010400UL, 0x01000004UL,
109 0x00000400UL, 0x00000004UL, 0x01000404UL, 0x00010404UL,
110 0x01010404UL, 0x00010004UL, 0x01010000UL, 0x01000404UL,
111 0x01000004UL, 0x00000404UL, 0x00010404UL, 0x01010400UL,
112 0x00000404UL, 0x01000400UL, 0x01000400UL, 0x00000000UL,
113 0x00010004UL, 0x00010400UL, 0x00000000UL, 0x01010004UL
114 };
115
116 static const u32 SP2[64] =
117 {
118 0x80108020UL, 0x80008000UL, 0x00008000UL, 0x00108020UL,
119 0x00100000UL, 0x00000020UL, 0x80100020UL, 0x80008020UL,
120 0x80000020UL, 0x80108020UL, 0x80108000UL, 0x80000000UL,
121 0x80008000UL, 0x00100000UL, 0x00000020UL, 0x80100020UL,
122 0x00108000UL, 0x00100020UL, 0x80008020UL, 0x00000000UL,
123 0x80000000UL, 0x00008000UL, 0x00108020UL, 0x80100000UL,
124 0x00100020UL, 0x80000020UL, 0x00000000UL, 0x00108000UL,
125 0x00008020UL, 0x80108000UL, 0x80100000UL, 0x00008020UL,
126 0x00000000UL, 0x00108020UL, 0x80100020UL, 0x00100000UL,
127 0x80008020UL, 0x80100000UL, 0x80108000UL, 0x00008000UL,
128 0x80100000UL, 0x80008000UL, 0x00000020UL, 0x80108020UL,
129 0x00108020UL, 0x00000020UL, 0x00008000UL, 0x80000000UL,
130 0x00008020UL, 0x80108000UL, 0x00100000UL, 0x80000020UL,
131 0x00100020UL, 0x80008020UL, 0x80000020UL, 0x00100020UL,
132 0x00108000UL, 0x00000000UL, 0x80008000UL, 0x00008020UL,
133 0x80000000UL, 0x80100020UL, 0x80108020UL, 0x00108000UL
134 };
135
136 static const u32 SP3[64] =
137 {
138 0x00000208UL, 0x08020200UL, 0x00000000UL, 0x08020008UL,
139 0x08000200UL, 0x00000000UL, 0x00020208UL, 0x08000200UL,
140 0x00020008UL, 0x08000008UL, 0x08000008UL, 0x00020000UL,
141 0x08020208UL, 0x00020008UL, 0x08020000UL, 0x00000208UL,
142 0x08000000UL, 0x00000008UL, 0x08020200UL, 0x00000200UL,
143 0x00020200UL, 0x08020000UL, 0x08020008UL, 0x00020208UL,
144 0x08000208UL, 0x00020200UL, 0x00020000UL, 0x08000208UL,
145 0x00000008UL, 0x08020208UL, 0x00000200UL, 0x08000000UL,
146 0x08020200UL, 0x08000000UL, 0x00020008UL, 0x00000208UL,
147 0x00020000UL, 0x08020200UL, 0x08000200UL, 0x00000000UL,
148 0x00000200UL, 0x00020008UL, 0x08020208UL, 0x08000200UL,
149 0x08000008UL, 0x00000200UL, 0x00000000UL, 0x08020008UL,
150 0x08000208UL, 0x00020000UL, 0x08000000UL, 0x08020208UL,
151 0x00000008UL, 0x00020208UL, 0x00020200UL, 0x08000008UL,
152 0x08020000UL, 0x08000208UL, 0x00000208UL, 0x08020000UL,
153 0x00020208UL, 0x00000008UL, 0x08020008UL, 0x00020200UL
154 };
155
156 static const u32 SP4[64] =
157 {
158 0x00802001UL, 0x00002081UL, 0x00002081UL, 0x00000080UL,
159 0x00802080UL, 0x00800081UL, 0x00800001UL, 0x00002001UL,
160 0x00000000UL, 0x00802000UL, 0x00802000UL, 0x00802081UL,
161 0x00000081UL, 0x00000000UL, 0x00800080UL, 0x00800001UL,
162 0x00000001UL, 0x00002000UL, 0x00800000UL, 0x00802001UL,
163 0x00000080UL, 0x00800000UL, 0x00002001UL, 0x00002080UL,
164 0x00800081UL, 0x00000001UL, 0x00002080UL, 0x00800080UL,
165 0x00002000UL, 0x00802080UL, 0x00802081UL, 0x00000081UL,
166 0x00800080UL, 0x00800001UL, 0x00802000UL, 0x00802081UL,
167 0x00000081UL, 0x00000000UL, 0x00000000UL, 0x00802000UL,
168 0x00002080UL, 0x00800080UL, 0x00800081UL, 0x00000001UL,
169 0x00802001UL, 0x00002081UL, 0x00002081UL, 0x00000080UL,
170 0x00802081UL, 0x00000081UL, 0x00000001UL, 0x00002000UL,
171 0x00800001UL, 0x00002001UL, 0x00802080UL, 0x00800081UL,
172 0x00002001UL, 0x00002080UL, 0x00800000UL, 0x00802001UL,
173 0x00000080UL, 0x00800000UL, 0x00002000UL, 0x00802080UL
174 };
175
176 static const u32 SP5[64] =
177 {
178 0x00000100UL, 0x02080100UL, 0x02080000UL, 0x42000100UL,
179 0x00080000UL, 0x00000100UL, 0x40000000UL, 0x02080000UL,
180 0x40080100UL, 0x00080000UL, 0x02000100UL, 0x40080100UL,
181 0x42000100UL, 0x42080000UL, 0x00080100UL, 0x40000000UL,
182 0x02000000UL, 0x40080000UL, 0x40080000UL, 0x00000000UL,
183 0x40000100UL, 0x42080100UL, 0x42080100UL, 0x02000100UL,
184 0x42080000UL, 0x40000100UL, 0x00000000UL, 0x42000000UL,
185 0x02080100UL, 0x02000000UL, 0x42000000UL, 0x00080100UL,
186 0x00080000UL, 0x42000100UL, 0x00000100UL, 0x02000000UL,
187 0x40000000UL, 0x02080000UL, 0x42000100UL, 0x40080100UL,
188 0x02000100UL, 0x40000000UL, 0x42080000UL, 0x02080100UL,
189 0x40080100UL, 0x00000100UL, 0x02000000UL, 0x42080000UL,
190 0x42080100UL, 0x00080100UL, 0x42000000UL, 0x42080100UL,
191 0x02080000UL, 0x00000000UL, 0x40080000UL, 0x42000000UL,
192 0x00080100UL, 0x02000100UL, 0x40000100UL, 0x00080000UL,
193 0x00000000UL, 0x40080000UL, 0x02080100UL, 0x40000100UL
194 };
195
196 static const u32 SP6[64] =
197 {
198 0x20000010UL, 0x20400000UL, 0x00004000UL, 0x20404010UL,
199 0x20400000UL, 0x00000010UL, 0x20404010UL, 0x00400000UL,
200 0x20004000UL, 0x00404010UL, 0x00400000UL, 0x20000010UL,
201 0x00400010UL, 0x20004000UL, 0x20000000UL, 0x00004010UL,
202 0x00000000UL, 0x00400010UL, 0x20004010UL, 0x00004000UL,
203 0x00404000UL, 0x20004010UL, 0x00000010UL, 0x20400010UL,
204 0x20400010UL, 0x00000000UL, 0x00404010UL, 0x20404000UL,
205 0x00004010UL, 0x00404000UL, 0x20404000UL, 0x20000000UL,
206 0x20004000UL, 0x00000010UL, 0x20400010UL, 0x00404000UL,
207 0x20404010UL, 0x00400000UL, 0x00004010UL, 0x20000010UL,
208 0x00400000UL, 0x20004000UL, 0x20000000UL, 0x00004010UL,
209 0x20000010UL, 0x20404010UL, 0x00404000UL, 0x20400000UL,
210 0x00404010UL, 0x20404000UL, 0x00000000UL, 0x20400010UL,
211 0x00000010UL, 0x00004000UL, 0x20400000UL, 0x00404010UL,
212 0x00004000UL, 0x00400010UL, 0x20004010UL, 0x00000000UL,
213 0x20404000UL, 0x20000000UL, 0x00400010UL, 0x20004010UL
214 };
215
216 static const u32 SP7[64] =
217 {
218 0x00200000UL, 0x04200002UL, 0x04000802UL, 0x00000000UL,
219 0x00000800UL, 0x04000802UL, 0x00200802UL, 0x04200800UL,
220 0x04200802UL, 0x00200000UL, 0x00000000UL, 0x04000002UL,
221 0x00000002UL, 0x04000000UL, 0x04200002UL, 0x00000802UL,
222 0x04000800UL, 0x00200802UL, 0x00200002UL, 0x04000800UL,
223 0x04000002UL, 0x04200000UL, 0x04200800UL, 0x00200002UL,
224 0x04200000UL, 0x00000800UL, 0x00000802UL, 0x04200802UL,
225 0x00200800UL, 0x00000002UL, 0x04000000UL, 0x00200800UL,
226 0x04000000UL, 0x00200800UL, 0x00200000UL, 0x04000802UL,
227 0x04000802UL, 0x04200002UL, 0x04200002UL, 0x00000002UL,
228 0x00200002UL, 0x04000000UL, 0x04000800UL, 0x00200000UL,
229 0x04200800UL, 0x00000802UL, 0x00200802UL, 0x04200800UL,
230 0x00000802UL, 0x04000002UL, 0x04200802UL, 0x04200000UL,
231 0x00200800UL, 0x00000000UL, 0x00000002UL, 0x04200802UL,
232 0x00000000UL, 0x00200802UL, 0x04200000UL, 0x00000800UL,
233 0x04000002UL, 0x04000800UL, 0x00000800UL, 0x00200002UL
234 };
235
236 static const u32 SP8[64] =
237 {
238 0x10001040UL, 0x00001000UL, 0x00040000UL, 0x10041040UL,
239 0x10000000UL, 0x10001040UL, 0x00000040UL, 0x10000000UL,
240 0x00040040UL, 0x10040000UL, 0x10041040UL, 0x00041000UL,
241 0x10041000UL, 0x00041040UL, 0x00001000UL, 0x00000040UL,
242 0x10040000UL, 0x10000040UL, 0x10001000UL, 0x00001040UL,
243 0x00041000UL, 0x00040040UL, 0x10040040UL, 0x10041000UL,
244 0x00001040UL, 0x00000000UL, 0x00000000UL, 0x10040040UL,
245 0x10000040UL, 0x10001000UL, 0x00041040UL, 0x00040000UL,
246 0x00041040UL, 0x00040000UL, 0x10041000UL, 0x00001000UL,
247 0x00000040UL, 0x10040040UL, 0x00001000UL, 0x00041040UL,
248 0x10001000UL, 0x00000040UL, 0x10000040UL, 0x10040000UL,
249 0x10040040UL, 0x10000000UL, 0x00040000UL, 0x10001040UL,
250 0x00000000UL, 0x10041040UL, 0x00040040UL, 0x10000040UL,
251 0x10040000UL, 0x10001000UL, 0x10001040UL, 0x00000000UL,
252 0x10041040UL, 0x00041000UL, 0x00041000UL, 0x00001040UL,
253 0x00001040UL, 0x00040040UL, 0x10000000UL, 0x10041000UL
254 };
255
256
257 static void cookey(const u32 *raw1, u32 *keyout)
258 {
259 u32 *cook;
260 const u32 *raw0;
261 u32 dough[32];
262 int i;
263
264 cook = dough;
265 for (i = 0; i < 16; i++, raw1++) {
266 raw0 = raw1++;
267 *cook = (*raw0 & 0x00fc0000L) << 6;
268 *cook |= (*raw0 & 0x00000fc0L) << 10;
269 *cook |= (*raw1 & 0x00fc0000L) >> 10;
270 *cook++ |= (*raw1 & 0x00000fc0L) >> 6;
271 *cook = (*raw0 & 0x0003f000L) << 12;
272 *cook |= (*raw0 & 0x0000003fL) << 16;
273 *cook |= (*raw1 & 0x0003f000L) >> 4;
274 *cook++ |= (*raw1 & 0x0000003fL);
275 }
276
277 os_memcpy(keyout, dough, sizeof(dough));
278 }
279
280
281 static void deskey(const u8 *key, int decrypt, u32 *keyout)
282 {
283 u32 i, j, l, m, n, kn[32];
284 u8 pc1m[56], pcr[56];
285
286 for (j = 0; j < 56; j++) {
287 l = (u32) pc1[j];
288 m = l & 7;
289 pc1m[j] = (u8)
290 ((key[l >> 3U] & bytebit[m]) == bytebit[m] ? 1 : 0);
291 }
292
293 for (i = 0; i < 16; i++) {
294 if (decrypt)
295 m = (15 - i) << 1;
296 else
297 m = i << 1;
298 n = m + 1;
299 kn[m] = kn[n] = 0L;
300 for (j = 0; j < 28; j++) {
301 l = j + (u32) totrot[i];
302 if (l < 28)
303 pcr[j] = pc1m[l];
304 else
305 pcr[j] = pc1m[l - 28];
306 }
307 for (/* j = 28 */; j < 56; j++) {
308 l = j + (u32) totrot[i];
309 if (l < 56)
310 pcr[j] = pc1m[l];
311 else
312 pcr[j] = pc1m[l - 28];
313 }
314 for (j = 0; j < 24; j++) {
315 if ((int) pcr[(int) pc2[j]] != 0)
316 kn[m] |= bigbyte[j];
317 if ((int) pcr[(int) pc2[j + 24]] != 0)
318 kn[n] |= bigbyte[j];
319 }
320 }
321
322 cookey(kn, keyout);
323 }
324
325
326 static void desfunc(u32 *block, const u32 *keys)
327 {
328 u32 work, right, leftt;
329 int cur_round;
330
331 leftt = block[0];
332 right = block[1];
333
334 work = ((leftt >> 4) ^ right) & 0x0f0f0f0fL;
335 right ^= work;
336 leftt ^= (work << 4);
337
338 work = ((leftt >> 16) ^ right) & 0x0000ffffL;
339 right ^= work;
340 leftt ^= (work << 16);
341
342 work = ((right >> 2) ^ leftt) & 0x33333333L;
343 leftt ^= work;
344 right ^= (work << 2);
345
346 work = ((right >> 8) ^ leftt) & 0x00ff00ffL;
347 leftt ^= work;
348 right ^= (work << 8);
349
350 right = ROLc(right, 1);
351 work = (leftt ^ right) & 0xaaaaaaaaL;
352
353 leftt ^= work;
354 right ^= work;
355 leftt = ROLc(leftt, 1);
356
357 for (cur_round = 0; cur_round < 8; cur_round++) {
358 work = RORc(right, 4) ^ *keys++;
359 leftt ^= SP7[work & 0x3fL]
360 ^ SP5[(work >> 8) & 0x3fL]
361 ^ SP3[(work >> 16) & 0x3fL]
362 ^ SP1[(work >> 24) & 0x3fL];
363 work = right ^ *keys++;
364 leftt ^= SP8[ work & 0x3fL]
365 ^ SP6[(work >> 8) & 0x3fL]
366 ^ SP4[(work >> 16) & 0x3fL]
367 ^ SP2[(work >> 24) & 0x3fL];
368
369 work = RORc(leftt, 4) ^ *keys++;
370 right ^= SP7[ work & 0x3fL]
371 ^ SP5[(work >> 8) & 0x3fL]
372 ^ SP3[(work >> 16) & 0x3fL]
373 ^ SP1[(work >> 24) & 0x3fL];
374 work = leftt ^ *keys++;
375 right ^= SP8[ work & 0x3fL]
376 ^ SP6[(work >> 8) & 0x3fL]
377 ^ SP4[(work >> 16) & 0x3fL]
378 ^ SP2[(work >> 24) & 0x3fL];
379 }
380
381 right = RORc(right, 1);
382 work = (leftt ^ right) & 0xaaaaaaaaL;
383 leftt ^= work;
384 right ^= work;
385 leftt = RORc(leftt, 1);
386 work = ((leftt >> 8) ^ right) & 0x00ff00ffL;
387 right ^= work;
388 leftt ^= (work << 8);
389 /* -- */
390 work = ((leftt >> 2) ^ right) & 0x33333333L;
391 right ^= work;
392 leftt ^= (work << 2);
393 work = ((right >> 16) ^ leftt) & 0x0000ffffL;
394 leftt ^= work;
395 right ^= (work << 16);
396 work = ((right >> 4) ^ leftt) & 0x0f0f0f0fL;
397 leftt ^= work;
398 right ^= (work << 4);
399
400 block[0] = right;
401 block[1] = leftt;
402 }
403
404
405 /* wpa_supplicant/hostapd specific wrapper */
406
407 void des_encrypt(const u8 *clear, const u8 *key, u8 *cypher)
408 {
409 u8 pkey[8], next, tmp;
410 int i;
411 u32 ek[32], work[2];
412
413 /* Add parity bits to the key */
414 next = 0;
415 for (i = 0; i < 7; i++) {
416 tmp = key[i];
417 pkey[i] = (tmp >> i) | next | 1;
418 next = tmp << (7 - i);
419 }
420 pkey[i] = next | 1;
421
422 deskey(pkey, 0, ek);
423
424 work[0] = WPA_GET_BE32(clear);
425 work[1] = WPA_GET_BE32(clear + 4);
426 desfunc(work, ek);
427 WPA_PUT_BE32(cypher, work[0]);
428 WPA_PUT_BE32(cypher + 4, work[1]);
429 }
430
431
432 struct des3_key_s {
433 u32 ek[3][32];
434 u32 dk[3][32];
435 };
436
437 void des3_key_setup(const u8 *key, struct des3_key_s *dkey)
438 {
439 deskey(key, 0, dkey->ek[0]);
440 deskey(key + 8, 1, dkey->ek[1]);
441 deskey(key + 16, 0, dkey->ek[2]);
442
443 deskey(key, 1, dkey->dk[2]);
444 deskey(key + 8, 0, dkey->dk[1]);
445 deskey(key + 16, 1, dkey->dk[0]);
446 }
447
448
449 void des3_encrypt(const u8 *plain, const struct des3_key_s *key, u8 *crypt)
450 {
451 u32 work[2];
452
453 work[0] = WPA_GET_BE32(plain);
454 work[1] = WPA_GET_BE32(plain + 4);
455 desfunc(work, key->ek[0]);
456 desfunc(work, key->ek[1]);
457 desfunc(work, key->ek[2]);
458 WPA_PUT_BE32(crypt, work[0]);
459 WPA_PUT_BE32(crypt + 4, work[1]);
460 }
461
462
463 void des3_decrypt(const u8 *crypt, const struct des3_key_s *key, u8 *plain)
464 {
465 u32 work[2];
466
467 work[0] = WPA_GET_BE32(crypt);
468 work[1] = WPA_GET_BE32(crypt + 4);
469 desfunc(work, key->dk[0]);
470 desfunc(work, key->dk[1]);
471 desfunc(work, key->dk[2]);
472 WPA_PUT_BE32(plain, work[0]);
473 WPA_PUT_BE32(plain + 4, work[1]);
474 }
475
476 #endif /* INTERNAL_DES */
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