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 "des_locl.h"
67 #ifdef OPENSSL_FIPS
68 #include <openssl/fips.h>
69 #endif
70
71
72 OPENSSL_IMPLEMENT_GLOBAL(int,DES_check_key); /* defaults to false */
73
74 static const unsigned char odd_parity[256]={
75 1, 1, 2, 2, 4, 4, 7, 7, 8, 8, 11, 11, 13, 13, 14, 14,
76 16, 16, 19, 19, 21, 21, 22, 22, 25, 25, 26, 26, 28, 28, 31, 31,
77 32, 32, 35, 35, 37, 37, 38, 38, 41, 41, 42, 42, 44, 44, 47, 47,
78 49, 49, 50, 50, 52, 52, 55, 55, 56, 56, 59, 59, 61, 61, 62, 62,
79 64, 64, 67, 67, 69, 69, 70, 70, 73, 73, 74, 74, 76, 76, 79, 79,
80 81, 81, 82, 82, 84, 84, 87, 87, 88, 88, 91, 91, 93, 93, 94, 94,
81 97, 97, 98, 98,100,100,103,103,104,104,107,107,109,109,110,110,
82 112,112,115,115,117,117,118,118,121,121,122,122,124,124,127,127,
83 128,128,131,131,133,133,134,134,137,137,138,138,140,140,143,143,
84 145,145,146,146,148,148,151,151,152,152,155,155,157,157,158,158,
85 161,161,162,162,164,164,167,167,168,168,171,171,173,173,174,174,
86 176,176,179,179,181,181,182,182,185,185,186,186,188,188,191,191,
87 193,193,194,194,196,196,199,199,200,200,203,203,205,205,206,206,
88 208,208,211,211,213,213,214,214,217,217,218,218,220,220,223,223,
89 224,224,227,227,229,229,230,230,233,233,234,234,236,236,239,239,
90 241,241,242,242,244,244,247,247,248,248,251,251,253,253,254,254};
91
DES_set_odd_parity(DES_cblock * key)92 void DES_set_odd_parity(DES_cblock *key)
93 {
94 unsigned int i;
95
96 for (i=0; i<DES_KEY_SZ; i++)
97 (*key)[i]=odd_parity[(*key)[i]];
98 }
99
DES_check_key_parity(const_DES_cblock * key)100 int DES_check_key_parity(const_DES_cblock *key)
101 {
102 unsigned int i;
103
104 for (i=0; i<DES_KEY_SZ; i++)
105 {
106 if ((*key)[i] != odd_parity[(*key)[i]])
107 return(0);
108 }
109 return(1);
110 }
111
112 /* Weak and semi week keys as take from
113 * %A D.W. Davies
114 * %A W.L. Price
115 * %T Security for Computer Networks
116 * %I John Wiley & Sons
117 * %D 1984
118 * Many thanks to smb@ulysses.att.com (Steven Bellovin) for the reference
119 * (and actual cblock values).
120 */
121 #define NUM_WEAK_KEY 16
122 static const DES_cblock weak_keys[NUM_WEAK_KEY]={
123 /* weak keys */
124 {0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01},
125 {0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE},
126 {0x1F,0x1F,0x1F,0x1F,0x0E,0x0E,0x0E,0x0E},
127 {0xE0,0xE0,0xE0,0xE0,0xF1,0xF1,0xF1,0xF1},
128 /* semi-weak keys */
129 {0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE},
130 {0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01},
131 {0x1F,0xE0,0x1F,0xE0,0x0E,0xF1,0x0E,0xF1},
132 {0xE0,0x1F,0xE0,0x1F,0xF1,0x0E,0xF1,0x0E},
133 {0x01,0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1},
134 {0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1,0x01},
135 {0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E,0xFE},
136 {0xFE,0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E},
137 {0x01,0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E},
138 {0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E,0x01},
139 {0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1,0xFE},
140 {0xFE,0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1}};
141
DES_is_weak_key(const_DES_cblock * key)142 int DES_is_weak_key(const_DES_cblock *key)
143 {
144 int i;
145
146 for (i=0; i<NUM_WEAK_KEY; i++)
147 /* Added == 0 to comparison, I obviously don't run
148 * this section very often :-(, thanks to
149 * engineering@MorningStar.Com for the fix
150 * eay 93/06/29
151 * Another problem, I was comparing only the first 4
152 * bytes, 97/03/18 */
153 if (memcmp(weak_keys[i],key,sizeof(DES_cblock)) == 0) return(1);
154 return(0);
155 }
156
157 /* NOW DEFINED IN des_local.h
158 * See ecb_encrypt.c for a pseudo description of these macros.
159 * #define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\
160 * (b)^=(t),\
161 * (a)=((a)^((t)<<(n))))
162 */
163
164 #define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\
165 (a)=(a)^(t)^(t>>(16-(n))))
166
167 static const DES_LONG des_skb[8][64]={
168 {
169 /* for C bits (numbered as per FIPS 46) 1 2 3 4 5 6 */
170 0x00000000L,0x00000010L,0x20000000L,0x20000010L,
171 0x00010000L,0x00010010L,0x20010000L,0x20010010L,
172 0x00000800L,0x00000810L,0x20000800L,0x20000810L,
173 0x00010800L,0x00010810L,0x20010800L,0x20010810L,
174 0x00000020L,0x00000030L,0x20000020L,0x20000030L,
175 0x00010020L,0x00010030L,0x20010020L,0x20010030L,
176 0x00000820L,0x00000830L,0x20000820L,0x20000830L,
177 0x00010820L,0x00010830L,0x20010820L,0x20010830L,
178 0x00080000L,0x00080010L,0x20080000L,0x20080010L,
179 0x00090000L,0x00090010L,0x20090000L,0x20090010L,
180 0x00080800L,0x00080810L,0x20080800L,0x20080810L,
181 0x00090800L,0x00090810L,0x20090800L,0x20090810L,
182 0x00080020L,0x00080030L,0x20080020L,0x20080030L,
183 0x00090020L,0x00090030L,0x20090020L,0x20090030L,
184 0x00080820L,0x00080830L,0x20080820L,0x20080830L,
185 0x00090820L,0x00090830L,0x20090820L,0x20090830L,
186 },{
187 /* for C bits (numbered as per FIPS 46) 7 8 10 11 12 13 */
188 0x00000000L,0x02000000L,0x00002000L,0x02002000L,
189 0x00200000L,0x02200000L,0x00202000L,0x02202000L,
190 0x00000004L,0x02000004L,0x00002004L,0x02002004L,
191 0x00200004L,0x02200004L,0x00202004L,0x02202004L,
192 0x00000400L,0x02000400L,0x00002400L,0x02002400L,
193 0x00200400L,0x02200400L,0x00202400L,0x02202400L,
194 0x00000404L,0x02000404L,0x00002404L,0x02002404L,
195 0x00200404L,0x02200404L,0x00202404L,0x02202404L,
196 0x10000000L,0x12000000L,0x10002000L,0x12002000L,
197 0x10200000L,0x12200000L,0x10202000L,0x12202000L,
198 0x10000004L,0x12000004L,0x10002004L,0x12002004L,
199 0x10200004L,0x12200004L,0x10202004L,0x12202004L,
200 0x10000400L,0x12000400L,0x10002400L,0x12002400L,
201 0x10200400L,0x12200400L,0x10202400L,0x12202400L,
202 0x10000404L,0x12000404L,0x10002404L,0x12002404L,
203 0x10200404L,0x12200404L,0x10202404L,0x12202404L,
204 },{
205 /* for C bits (numbered as per FIPS 46) 14 15 16 17 19 20 */
206 0x00000000L,0x00000001L,0x00040000L,0x00040001L,
207 0x01000000L,0x01000001L,0x01040000L,0x01040001L,
208 0x00000002L,0x00000003L,0x00040002L,0x00040003L,
209 0x01000002L,0x01000003L,0x01040002L,0x01040003L,
210 0x00000200L,0x00000201L,0x00040200L,0x00040201L,
211 0x01000200L,0x01000201L,0x01040200L,0x01040201L,
212 0x00000202L,0x00000203L,0x00040202L,0x00040203L,
213 0x01000202L,0x01000203L,0x01040202L,0x01040203L,
214 0x08000000L,0x08000001L,0x08040000L,0x08040001L,
215 0x09000000L,0x09000001L,0x09040000L,0x09040001L,
216 0x08000002L,0x08000003L,0x08040002L,0x08040003L,
217 0x09000002L,0x09000003L,0x09040002L,0x09040003L,
218 0x08000200L,0x08000201L,0x08040200L,0x08040201L,
219 0x09000200L,0x09000201L,0x09040200L,0x09040201L,
220 0x08000202L,0x08000203L,0x08040202L,0x08040203L,
221 0x09000202L,0x09000203L,0x09040202L,0x09040203L,
222 },{
223 /* for C bits (numbered as per FIPS 46) 21 23 24 26 27 28 */
224 0x00000000L,0x00100000L,0x00000100L,0x00100100L,
225 0x00000008L,0x00100008L,0x00000108L,0x00100108L,
226 0x00001000L,0x00101000L,0x00001100L,0x00101100L,
227 0x00001008L,0x00101008L,0x00001108L,0x00101108L,
228 0x04000000L,0x04100000L,0x04000100L,0x04100100L,
229 0x04000008L,0x04100008L,0x04000108L,0x04100108L,
230 0x04001000L,0x04101000L,0x04001100L,0x04101100L,
231 0x04001008L,0x04101008L,0x04001108L,0x04101108L,
232 0x00020000L,0x00120000L,0x00020100L,0x00120100L,
233 0x00020008L,0x00120008L,0x00020108L,0x00120108L,
234 0x00021000L,0x00121000L,0x00021100L,0x00121100L,
235 0x00021008L,0x00121008L,0x00021108L,0x00121108L,
236 0x04020000L,0x04120000L,0x04020100L,0x04120100L,
237 0x04020008L,0x04120008L,0x04020108L,0x04120108L,
238 0x04021000L,0x04121000L,0x04021100L,0x04121100L,
239 0x04021008L,0x04121008L,0x04021108L,0x04121108L,
240 },{
241 /* for D bits (numbered as per FIPS 46) 1 2 3 4 5 6 */
242 0x00000000L,0x10000000L,0x00010000L,0x10010000L,
243 0x00000004L,0x10000004L,0x00010004L,0x10010004L,
244 0x20000000L,0x30000000L,0x20010000L,0x30010000L,
245 0x20000004L,0x30000004L,0x20010004L,0x30010004L,
246 0x00100000L,0x10100000L,0x00110000L,0x10110000L,
247 0x00100004L,0x10100004L,0x00110004L,0x10110004L,
248 0x20100000L,0x30100000L,0x20110000L,0x30110000L,
249 0x20100004L,0x30100004L,0x20110004L,0x30110004L,
250 0x00001000L,0x10001000L,0x00011000L,0x10011000L,
251 0x00001004L,0x10001004L,0x00011004L,0x10011004L,
252 0x20001000L,0x30001000L,0x20011000L,0x30011000L,
253 0x20001004L,0x30001004L,0x20011004L,0x30011004L,
254 0x00101000L,0x10101000L,0x00111000L,0x10111000L,
255 0x00101004L,0x10101004L,0x00111004L,0x10111004L,
256 0x20101000L,0x30101000L,0x20111000L,0x30111000L,
257 0x20101004L,0x30101004L,0x20111004L,0x30111004L,
258 },{
259 /* for D bits (numbered as per FIPS 46) 8 9 11 12 13 14 */
260 0x00000000L,0x08000000L,0x00000008L,0x08000008L,
261 0x00000400L,0x08000400L,0x00000408L,0x08000408L,
262 0x00020000L,0x08020000L,0x00020008L,0x08020008L,
263 0x00020400L,0x08020400L,0x00020408L,0x08020408L,
264 0x00000001L,0x08000001L,0x00000009L,0x08000009L,
265 0x00000401L,0x08000401L,0x00000409L,0x08000409L,
266 0x00020001L,0x08020001L,0x00020009L,0x08020009L,
267 0x00020401L,0x08020401L,0x00020409L,0x08020409L,
268 0x02000000L,0x0A000000L,0x02000008L,0x0A000008L,
269 0x02000400L,0x0A000400L,0x02000408L,0x0A000408L,
270 0x02020000L,0x0A020000L,0x02020008L,0x0A020008L,
271 0x02020400L,0x0A020400L,0x02020408L,0x0A020408L,
272 0x02000001L,0x0A000001L,0x02000009L,0x0A000009L,
273 0x02000401L,0x0A000401L,0x02000409L,0x0A000409L,
274 0x02020001L,0x0A020001L,0x02020009L,0x0A020009L,
275 0x02020401L,0x0A020401L,0x02020409L,0x0A020409L,
276 },{
277 /* for D bits (numbered as per FIPS 46) 16 17 18 19 20 21 */
278 0x00000000L,0x00000100L,0x00080000L,0x00080100L,
279 0x01000000L,0x01000100L,0x01080000L,0x01080100L,
280 0x00000010L,0x00000110L,0x00080010L,0x00080110L,
281 0x01000010L,0x01000110L,0x01080010L,0x01080110L,
282 0x00200000L,0x00200100L,0x00280000L,0x00280100L,
283 0x01200000L,0x01200100L,0x01280000L,0x01280100L,
284 0x00200010L,0x00200110L,0x00280010L,0x00280110L,
285 0x01200010L,0x01200110L,0x01280010L,0x01280110L,
286 0x00000200L,0x00000300L,0x00080200L,0x00080300L,
287 0x01000200L,0x01000300L,0x01080200L,0x01080300L,
288 0x00000210L,0x00000310L,0x00080210L,0x00080310L,
289 0x01000210L,0x01000310L,0x01080210L,0x01080310L,
290 0x00200200L,0x00200300L,0x00280200L,0x00280300L,
291 0x01200200L,0x01200300L,0x01280200L,0x01280300L,
292 0x00200210L,0x00200310L,0x00280210L,0x00280310L,
293 0x01200210L,0x01200310L,0x01280210L,0x01280310L,
294 },{
295 /* for D bits (numbered as per FIPS 46) 22 23 24 25 27 28 */
296 0x00000000L,0x04000000L,0x00040000L,0x04040000L,
297 0x00000002L,0x04000002L,0x00040002L,0x04040002L,
298 0x00002000L,0x04002000L,0x00042000L,0x04042000L,
299 0x00002002L,0x04002002L,0x00042002L,0x04042002L,
300 0x00000020L,0x04000020L,0x00040020L,0x04040020L,
301 0x00000022L,0x04000022L,0x00040022L,0x04040022L,
302 0x00002020L,0x04002020L,0x00042020L,0x04042020L,
303 0x00002022L,0x04002022L,0x00042022L,0x04042022L,
304 0x00000800L,0x04000800L,0x00040800L,0x04040800L,
305 0x00000802L,0x04000802L,0x00040802L,0x04040802L,
306 0x00002800L,0x04002800L,0x00042800L,0x04042800L,
307 0x00002802L,0x04002802L,0x00042802L,0x04042802L,
308 0x00000820L,0x04000820L,0x00040820L,0x04040820L,
309 0x00000822L,0x04000822L,0x00040822L,0x04040822L,
310 0x00002820L,0x04002820L,0x00042820L,0x04042820L,
311 0x00002822L,0x04002822L,0x00042822L,0x04042822L,
312 }};
313
DES_set_key(const_DES_cblock * key,DES_key_schedule * schedule)314 int DES_set_key(const_DES_cblock *key, DES_key_schedule *schedule)
315 {
316 if (DES_check_key)
317 {
318 return DES_set_key_checked(key, schedule);
319 }
320 else
321 {
322 DES_set_key_unchecked(key, schedule);
323 return 0;
324 }
325 }
326
327 /* return 0 if key parity is odd (correct),
328 * return -1 if key parity error,
329 * return -2 if illegal weak key.
330 */
DES_set_key_checked(const_DES_cblock * key,DES_key_schedule * schedule)331 int DES_set_key_checked(const_DES_cblock *key, DES_key_schedule *schedule)
332 {
333 if (!DES_check_key_parity(key))
334 return(-1);
335 if (DES_is_weak_key(key))
336 return(-2);
337 DES_set_key_unchecked(key, schedule);
338 return 0;
339 }
340
DES_set_key_unchecked(const_DES_cblock * key,DES_key_schedule * schedule)341 void DES_set_key_unchecked(const_DES_cblock *key, DES_key_schedule *schedule)
342 {
343 static int shifts2[16]={0,0,1,1,1,1,1,1,0,1,1,1,1,1,1,0};
344 register DES_LONG c,d,t,s,t2;
345 register const unsigned char *in;
346 register DES_LONG *k;
347 register int i;
348
349 #ifdef OPENBSD_DEV_CRYPTO
350 memcpy(schedule->key,key,sizeof schedule->key);
351 schedule->session=NULL;
352 #endif
353 k = &schedule->ks->deslong[0];
354 in = &(*key)[0];
355
356 #ifdef OPENSSL_FIPS
357 FIPS_selftest_check();
358 #endif
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
DES_key_sched(const_DES_cblock * key,DES_key_schedule * schedule)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 */
416
417