1 /* crypto/des/set_key.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59 /* set_key.c v 1.4 eay 24/9/91
60 * 1.4 Speed up by 400% :-)
61 * 1.3 added register declarations.
62 * 1.2 unrolled make_key_sched a bit more
63 * 1.1 added norm_expand_bits
64 * 1.0 First working version
65 */
66 #include <openssl/crypto.h>
67 #include "des_locl.h"
68
69 OPENSSL_IMPLEMENT_GLOBAL(int,DES_check_key,0) /* defaults to false */
70
71 static const unsigned char odd_parity[256]={
72 1, 1, 2, 2, 4, 4, 7, 7, 8, 8, 11, 11, 13, 13, 14, 14,
73 16, 16, 19, 19, 21, 21, 22, 22, 25, 25, 26, 26, 28, 28, 31, 31,
74 32, 32, 35, 35, 37, 37, 38, 38, 41, 41, 42, 42, 44, 44, 47, 47,
75 49, 49, 50, 50, 52, 52, 55, 55, 56, 56, 59, 59, 61, 61, 62, 62,
76 64, 64, 67, 67, 69, 69, 70, 70, 73, 73, 74, 74, 76, 76, 79, 79,
77 81, 81, 82, 82, 84, 84, 87, 87, 88, 88, 91, 91, 93, 93, 94, 94,
78 97, 97, 98, 98,100,100,103,103,104,104,107,107,109,109,110,110,
79 112,112,115,115,117,117,118,118,121,121,122,122,124,124,127,127,
80 128,128,131,131,133,133,134,134,137,137,138,138,140,140,143,143,
81 145,145,146,146,148,148,151,151,152,152,155,155,157,157,158,158,
82 161,161,162,162,164,164,167,167,168,168,171,171,173,173,174,174,
83 176,176,179,179,181,181,182,182,185,185,186,186,188,188,191,191,
84 193,193,194,194,196,196,199,199,200,200,203,203,205,205,206,206,
85 208,208,211,211,213,213,214,214,217,217,218,218,220,220,223,223,
86 224,224,227,227,229,229,230,230,233,233,234,234,236,236,239,239,
87 241,241,242,242,244,244,247,247,248,248,251,251,253,253,254,254};
88
89 void DES_set_odd_parity(DES_cblock *key)
90 {
91 unsigned int i;
92
93 for (i=0; i<DES_KEY_SZ; i++)
94 (*key)[i]=odd_parity[(*key)[i]];
95 }
96
97 int DES_check_key_parity(const_DES_cblock *key)
98 {
99 unsigned int i;
100
101 for (i=0; i<DES_KEY_SZ; i++)
102 {
103 if ((*key)[i] != odd_parity[(*key)[i]])
104 return(0);
105 }
106 return(1);
107 }
108
109 /* Weak and semi week keys as take from
110 * %A D.W. Davies
111 * %A W.L. Price
112 * %T Security for Computer Networks
113 * %I John Wiley & Sons
114 * %D 1984
115 * Many thanks to smb@ulysses.att.com (Steven Bellovin) for the reference
116 * (and actual cblock values).
117 */
118 #define NUM_WEAK_KEY 16
119 static const DES_cblock weak_keys[NUM_WEAK_KEY]={
120 /* weak keys */
121 {0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01},
122 {0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE},
123 {0x1F,0x1F,0x1F,0x1F,0x0E,0x0E,0x0E,0x0E},
124 {0xE0,0xE0,0xE0,0xE0,0xF1,0xF1,0xF1,0xF1},
125 /* semi-weak keys */
126 {0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE},
127 {0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01},
128 {0x1F,0xE0,0x1F,0xE0,0x0E,0xF1,0x0E,0xF1},
129 {0xE0,0x1F,0xE0,0x1F,0xF1,0x0E,0xF1,0x0E},
130 {0x01,0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1},
131 {0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1,0x01},
132 {0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E,0xFE},
133 {0xFE,0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E},
134 {0x01,0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E},
135 {0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E,0x01},
136 {0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1,0xFE},
137 {0xFE,0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1}};
138
139 int DES_is_weak_key(const_DES_cblock *key)
140 {
141 int i;
142
143 for (i=0; i<NUM_WEAK_KEY; i++)
144 /* Added == 0 to comparison, I obviously don't run
145 * this section very often :-(, thanks to
146 * engineering@MorningStar.Com for the fix
147 * eay 93/06/29
148 * Another problem, I was comparing only the first 4
149 * bytes, 97/03/18 */
150 if (memcmp(weak_keys[i],key,sizeof(DES_cblock)) == 0) return(1);
151 return(0);
152 }
153
154 /* NOW DEFINED IN des_local.h
155 * See ecb_encrypt.c for a pseudo description of these macros.
156 * #define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\
157 * (b)^=(t),\
158 * (a)=((a)^((t)<<(n))))
159 */
160
161 #define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\
162 (a)=(a)^(t)^(t>>(16-(n))))
163
164 static const DES_LONG des_skb[8][64]={
165 {
166 /* for C bits (numbered as per FIPS 46) 1 2 3 4 5 6 */
167 0x00000000L,0x00000010L,0x20000000L,0x20000010L,
168 0x00010000L,0x00010010L,0x20010000L,0x20010010L,
169 0x00000800L,0x00000810L,0x20000800L,0x20000810L,
170 0x00010800L,0x00010810L,0x20010800L,0x20010810L,
171 0x00000020L,0x00000030L,0x20000020L,0x20000030L,
172 0x00010020L,0x00010030L,0x20010020L,0x20010030L,
173 0x00000820L,0x00000830L,0x20000820L,0x20000830L,
174 0x00010820L,0x00010830L,0x20010820L,0x20010830L,
175 0x00080000L,0x00080010L,0x20080000L,0x20080010L,
176 0x00090000L,0x00090010L,0x20090000L,0x20090010L,
177 0x00080800L,0x00080810L,0x20080800L,0x20080810L,
178 0x00090800L,0x00090810L,0x20090800L,0x20090810L,
179 0x00080020L,0x00080030L,0x20080020L,0x20080030L,
180 0x00090020L,0x00090030L,0x20090020L,0x20090030L,
181 0x00080820L,0x00080830L,0x20080820L,0x20080830L,
182 0x00090820L,0x00090830L,0x20090820L,0x20090830L,
183 },{
184 /* for C bits (numbered as per FIPS 46) 7 8 10 11 12 13 */
185 0x00000000L,0x02000000L,0x00002000L,0x02002000L,
186 0x00200000L,0x02200000L,0x00202000L,0x02202000L,
187 0x00000004L,0x02000004L,0x00002004L,0x02002004L,
188 0x00200004L,0x02200004L,0x00202004L,0x02202004L,
189 0x00000400L,0x02000400L,0x00002400L,0x02002400L,
190 0x00200400L,0x02200400L,0x00202400L,0x02202400L,
191 0x00000404L,0x02000404L,0x00002404L,0x02002404L,
192 0x00200404L,0x02200404L,0x00202404L,0x02202404L,
193 0x10000000L,0x12000000L,0x10002000L,0x12002000L,
194 0x10200000L,0x12200000L,0x10202000L,0x12202000L,
195 0x10000004L,0x12000004L,0x10002004L,0x12002004L,
196 0x10200004L,0x12200004L,0x10202004L,0x12202004L,
197 0x10000400L,0x12000400L,0x10002400L,0x12002400L,
198 0x10200400L,0x12200400L,0x10202400L,0x12202400L,
199 0x10000404L,0x12000404L,0x10002404L,0x12002404L,
200 0x10200404L,0x12200404L,0x10202404L,0x12202404L,
201 },{
202 /* for C bits (numbered as per FIPS 46) 14 15 16 17 19 20 */
203 0x00000000L,0x00000001L,0x00040000L,0x00040001L,
204 0x01000000L,0x01000001L,0x01040000L,0x01040001L,
205 0x00000002L,0x00000003L,0x00040002L,0x00040003L,
206 0x01000002L,0x01000003L,0x01040002L,0x01040003L,
207 0x00000200L,0x00000201L,0x00040200L,0x00040201L,
208 0x01000200L,0x01000201L,0x01040200L,0x01040201L,
209 0x00000202L,0x00000203L,0x00040202L,0x00040203L,
210 0x01000202L,0x01000203L,0x01040202L,0x01040203L,
211 0x08000000L,0x08000001L,0x08040000L,0x08040001L,
212 0x09000000L,0x09000001L,0x09040000L,0x09040001L,
213 0x08000002L,0x08000003L,0x08040002L,0x08040003L,
214 0x09000002L,0x09000003L,0x09040002L,0x09040003L,
215 0x08000200L,0x08000201L,0x08040200L,0x08040201L,
216 0x09000200L,0x09000201L,0x09040200L,0x09040201L,
217 0x08000202L,0x08000203L,0x08040202L,0x08040203L,
218 0x09000202L,0x09000203L,0x09040202L,0x09040203L,
219 },{
220 /* for C bits (numbered as per FIPS 46) 21 23 24 26 27 28 */
221 0x00000000L,0x00100000L,0x00000100L,0x00100100L,
222 0x00000008L,0x00100008L,0x00000108L,0x00100108L,
223 0x00001000L,0x00101000L,0x00001100L,0x00101100L,
224 0x00001008L,0x00101008L,0x00001108L,0x00101108L,
225 0x04000000L,0x04100000L,0x04000100L,0x04100100L,
226 0x04000008L,0x04100008L,0x04000108L,0x04100108L,
227 0x04001000L,0x04101000L,0x04001100L,0x04101100L,
228 0x04001008L,0x04101008L,0x04001108L,0x04101108L,
229 0x00020000L,0x00120000L,0x00020100L,0x00120100L,
230 0x00020008L,0x00120008L,0x00020108L,0x00120108L,
231 0x00021000L,0x00121000L,0x00021100L,0x00121100L,
232 0x00021008L,0x00121008L,0x00021108L,0x00121108L,
233 0x04020000L,0x04120000L,0x04020100L,0x04120100L,
234 0x04020008L,0x04120008L,0x04020108L,0x04120108L,
235 0x04021000L,0x04121000L,0x04021100L,0x04121100L,
236 0x04021008L,0x04121008L,0x04021108L,0x04121108L,
237 },{
238 /* for D bits (numbered as per FIPS 46) 1 2 3 4 5 6 */
239 0x00000000L,0x10000000L,0x00010000L,0x10010000L,
240 0x00000004L,0x10000004L,0x00010004L,0x10010004L,
241 0x20000000L,0x30000000L,0x20010000L,0x30010000L,
242 0x20000004L,0x30000004L,0x20010004L,0x30010004L,
243 0x00100000L,0x10100000L,0x00110000L,0x10110000L,
244 0x00100004L,0x10100004L,0x00110004L,0x10110004L,
245 0x20100000L,0x30100000L,0x20110000L,0x30110000L,
246 0x20100004L,0x30100004L,0x20110004L,0x30110004L,
247 0x00001000L,0x10001000L,0x00011000L,0x10011000L,
248 0x00001004L,0x10001004L,0x00011004L,0x10011004L,
249 0x20001000L,0x30001000L,0x20011000L,0x30011000L,
250 0x20001004L,0x30001004L,0x20011004L,0x30011004L,
251 0x00101000L,0x10101000L,0x00111000L,0x10111000L,
252 0x00101004L,0x10101004L,0x00111004L,0x10111004L,
253 0x20101000L,0x30101000L,0x20111000L,0x30111000L,
254 0x20101004L,0x30101004L,0x20111004L,0x30111004L,
255 },{
256 /* for D bits (numbered as per FIPS 46) 8 9 11 12 13 14 */
257 0x00000000L,0x08000000L,0x00000008L,0x08000008L,
258 0x00000400L,0x08000400L,0x00000408L,0x08000408L,
259 0x00020000L,0x08020000L,0x00020008L,0x08020008L,
260 0x00020400L,0x08020400L,0x00020408L,0x08020408L,
261 0x00000001L,0x08000001L,0x00000009L,0x08000009L,
262 0x00000401L,0x08000401L,0x00000409L,0x08000409L,
263 0x00020001L,0x08020001L,0x00020009L,0x08020009L,
264 0x00020401L,0x08020401L,0x00020409L,0x08020409L,
265 0x02000000L,0x0A000000L,0x02000008L,0x0A000008L,
266 0x02000400L,0x0A000400L,0x02000408L,0x0A000408L,
267 0x02020000L,0x0A020000L,0x02020008L,0x0A020008L,
268 0x02020400L,0x0A020400L,0x02020408L,0x0A020408L,
269 0x02000001L,0x0A000001L,0x02000009L,0x0A000009L,
270 0x02000401L,0x0A000401L,0x02000409L,0x0A000409L,
271 0x02020001L,0x0A020001L,0x02020009L,0x0A020009L,
272 0x02020401L,0x0A020401L,0x02020409L,0x0A020409L,
273 },{
274 /* for D bits (numbered as per FIPS 46) 16 17 18 19 20 21 */
275 0x00000000L,0x00000100L,0x00080000L,0x00080100L,
276 0x01000000L,0x01000100L,0x01080000L,0x01080100L,
277 0x00000010L,0x00000110L,0x00080010L,0x00080110L,
278 0x01000010L,0x01000110L,0x01080010L,0x01080110L,
279 0x00200000L,0x00200100L,0x00280000L,0x00280100L,
280 0x01200000L,0x01200100L,0x01280000L,0x01280100L,
281 0x00200010L,0x00200110L,0x00280010L,0x00280110L,
282 0x01200010L,0x01200110L,0x01280010L,0x01280110L,
283 0x00000200L,0x00000300L,0x00080200L,0x00080300L,
284 0x01000200L,0x01000300L,0x01080200L,0x01080300L,
285 0x00000210L,0x00000310L,0x00080210L,0x00080310L,
286 0x01000210L,0x01000310L,0x01080210L,0x01080310L,
287 0x00200200L,0x00200300L,0x00280200L,0x00280300L,
288 0x01200200L,0x01200300L,0x01280200L,0x01280300L,
289 0x00200210L,0x00200310L,0x00280210L,0x00280310L,
290 0x01200210L,0x01200310L,0x01280210L,0x01280310L,
291 },{
292 /* for D bits (numbered as per FIPS 46) 22 23 24 25 27 28 */
293 0x00000000L,0x04000000L,0x00040000L,0x04040000L,
294 0x00000002L,0x04000002L,0x00040002L,0x04040002L,
295 0x00002000L,0x04002000L,0x00042000L,0x04042000L,
296 0x00002002L,0x04002002L,0x00042002L,0x04042002L,
297 0x00000020L,0x04000020L,0x00040020L,0x04040020L,
298 0x00000022L,0x04000022L,0x00040022L,0x04040022L,
299 0x00002020L,0x04002020L,0x00042020L,0x04042020L,
300 0x00002022L,0x04002022L,0x00042022L,0x04042022L,
301 0x00000800L,0x04000800L,0x00040800L,0x04040800L,
302 0x00000802L,0x04000802L,0x00040802L,0x04040802L,
303 0x00002800L,0x04002800L,0x00042800L,0x04042800L,
304 0x00002802L,0x04002802L,0x00042802L,0x04042802L,
305 0x00000820L,0x04000820L,0x00040820L,0x04040820L,
306 0x00000822L,0x04000822L,0x00040822L,0x04040822L,
307 0x00002820L,0x04002820L,0x00042820L,0x04042820L,
308 0x00002822L,0x04002822L,0x00042822L,0x04042822L,
309 }};
310
311 int DES_set_key(const_DES_cblock *key, DES_key_schedule *schedule)
312 {
313 if (DES_check_key)
314 {
315 return DES_set_key_checked(key, schedule);
316 }
317 else
318 {
319 DES_set_key_unchecked(key, schedule);
320 return 0;
321 }
322 }
323
324 /* return 0 if key parity is odd (correct),
325 * return -1 if key parity error,
326 * return -2 if illegal weak key.
327 */
328 int DES_set_key_checked(const_DES_cblock *key, DES_key_schedule *schedule)
329 {
330 if (!DES_check_key_parity(key))
331 return(-1);
332 if (DES_is_weak_key(key))
333 return(-2);
334 DES_set_key_unchecked(key, schedule);
335 return 0;
336 }
337
338 void DES_set_key_unchecked(const_DES_cblock *key, DES_key_schedule *schedule)
339 #ifdef OPENSSL_FIPS
340 {
341 fips_cipher_abort(DES);
342 private_DES_set_key_unchecked(key, schedule);
343 }
344 void private_DES_set_key_unchecked(const_DES_cblock *key, DES_key_schedule *schedule)
345 #endif
346 {
347 static const int shifts2[16]={0,0,1,1,1,1,1,1,0,1,1,1,1,1,1,0};
348 register DES_LONG c,d,t,s,t2;
349 register const unsigned char *in;
350 register DES_LONG *k;
351 register int i;
352
353 #ifdef OPENBSD_DEV_CRYPTO
354 memcpy(schedule->key,key,sizeof schedule->key);
355 schedule->session=NULL;
356 #endif
357 k = &schedule->ks->deslong[0];
358 in = &(*key)[0];
359
360 c2l(in,c);
361 c2l(in,d);
362
363 /* do PC1 in 47 simple operations :-)
364 * Thanks to John Fletcher (john_fletcher@lccmail.ocf.llnl.gov)
365 * for the inspiration. :-) */
366 PERM_OP (d,c,t,4,0x0f0f0f0fL);
367 HPERM_OP(c,t,-2,0xcccc0000L);
368 HPERM_OP(d,t,-2,0xcccc0000L);
369 PERM_OP (d,c,t,1,0x55555555L);
370 PERM_OP (c,d,t,8,0x00ff00ffL);
371 PERM_OP (d,c,t,1,0x55555555L);
372 d= (((d&0x000000ffL)<<16L)| (d&0x0000ff00L) |
373 ((d&0x00ff0000L)>>16L)|((c&0xf0000000L)>>4L));
374 c&=0x0fffffffL;
375
376 for (i=0; i<ITERATIONS; i++)
377 {
378 if (shifts2[i])
379 { c=((c>>2L)|(c<<26L)); d=((d>>2L)|(d<<26L)); }
380 else
381 { c=((c>>1L)|(c<<27L)); d=((d>>1L)|(d<<27L)); }
382 c&=0x0fffffffL;
383 d&=0x0fffffffL;
384 /* could be a few less shifts but I am to lazy at this
385 * point in time to investigate */
386 s= des_skb[0][ (c )&0x3f ]|
387 des_skb[1][((c>> 6L)&0x03)|((c>> 7L)&0x3c)]|
388 des_skb[2][((c>>13L)&0x0f)|((c>>14L)&0x30)]|
389 des_skb[3][((c>>20L)&0x01)|((c>>21L)&0x06) |
390 ((c>>22L)&0x38)];
391 t= des_skb[4][ (d )&0x3f ]|
392 des_skb[5][((d>> 7L)&0x03)|((d>> 8L)&0x3c)]|
393 des_skb[6][ (d>>15L)&0x3f ]|
394 des_skb[7][((d>>21L)&0x0f)|((d>>22L)&0x30)];
395
396 /* table contained 0213 4657 */
397 t2=((t<<16L)|(s&0x0000ffffL))&0xffffffffL;
398 *(k++)=ROTATE(t2,30)&0xffffffffL;
399
400 t2=((s>>16L)|(t&0xffff0000L));
401 *(k++)=ROTATE(t2,26)&0xffffffffL;
402 }
403 }
404
405 int DES_key_sched(const_DES_cblock *key, DES_key_schedule *schedule)
406 {
407 return(DES_set_key(key,schedule));
408 }
409 /*
410 #undef des_fixup_key_parity
411 void des_fixup_key_parity(des_cblock *key)
412 {
413 des_set_odd_parity(key);
414 }
415 */