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