2 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
11 * set_key.c v 1.4 eay 24/9/91
12 * 1.4 Speed up by 400% :-)
13 * 1.3 added register declarations.
14 * 1.2 unrolled make_key_sched a bit more
15 * 1.1 added norm_expand_bits
16 * 1.0 First working version
18 #include <openssl/crypto.h>
21 /* defaults to false */
22 OPENSSL_IMPLEMENT_GLOBAL(int, DES_check_key, 0)
24 static const unsigned char odd_parity[256] = {
25 1, 1, 2, 2, 4, 4, 7, 7, 8, 8, 11, 11, 13, 13, 14, 14,
26 16, 16, 19, 19, 21, 21, 22, 22, 25, 25, 26, 26, 28, 28, 31, 31,
27 32, 32, 35, 35, 37, 37, 38, 38, 41, 41, 42, 42, 44, 44, 47, 47,
28 49, 49, 50, 50, 52, 52, 55, 55, 56, 56, 59, 59, 61, 61, 62, 62,
29 64, 64, 67, 67, 69, 69, 70, 70, 73, 73, 74, 74, 76, 76, 79, 79,
30 81, 81, 82, 82, 84, 84, 87, 87, 88, 88, 91, 91, 93, 93, 94, 94,
31 97, 97, 98, 98, 100, 100, 103, 103, 104, 104, 107, 107, 109, 109, 110,
33 112, 112, 115, 115, 117, 117, 118, 118, 121, 121, 122, 122, 124, 124, 127,
35 128, 128, 131, 131, 133, 133, 134, 134, 137, 137, 138, 138, 140, 140, 143,
37 145, 145, 146, 146, 148, 148, 151, 151, 152, 152, 155, 155, 157, 157, 158,
39 161, 161, 162, 162, 164, 164, 167, 167, 168, 168, 171, 171, 173, 173, 174,
41 176, 176, 179, 179, 181, 181, 182, 182, 185, 185, 186, 186, 188, 188, 191,
43 193, 193, 194, 194, 196, 196, 199, 199, 200, 200, 203, 203, 205, 205, 206,
45 208, 208, 211, 211, 213, 213, 214, 214, 217, 217, 218, 218, 220, 220, 223,
47 224, 224, 227, 227, 229, 229, 230, 230, 233, 233, 234, 234, 236, 236, 239,
49 241, 241, 242, 242, 244, 244, 247, 247, 248, 248, 251, 251, 253, 253, 254,
53 void DES_set_odd_parity(DES_cblock *key)
57 for (i = 0; i < DES_KEY_SZ; i++)
58 (*key)[i] = odd_parity[(*key)[i]];
61 int DES_check_key_parity(const_DES_cblock *key)
65 for (i = 0; i < DES_KEY_SZ; i++) {
66 if ((*key)[i] != odd_parity[(*key)[i]])
73 * Weak and semi weak keys as taken from
76 * %T Security for Computer Networks
77 * %I John Wiley & Sons
80 #define NUM_WEAK_KEY 16
81 static const DES_cblock weak_keys[NUM_WEAK_KEY] = {
83 {0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01},
84 {0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE},
85 {0x1F, 0x1F, 0x1F, 0x1F, 0x0E, 0x0E, 0x0E, 0x0E},
86 {0xE0, 0xE0, 0xE0, 0xE0, 0xF1, 0xF1, 0xF1, 0xF1},
88 {0x01, 0xFE, 0x01, 0xFE, 0x01, 0xFE, 0x01, 0xFE},
89 {0xFE, 0x01, 0xFE, 0x01, 0xFE, 0x01, 0xFE, 0x01},
90 {0x1F, 0xE0, 0x1F, 0xE0, 0x0E, 0xF1, 0x0E, 0xF1},
91 {0xE0, 0x1F, 0xE0, 0x1F, 0xF1, 0x0E, 0xF1, 0x0E},
92 {0x01, 0xE0, 0x01, 0xE0, 0x01, 0xF1, 0x01, 0xF1},
93 {0xE0, 0x01, 0xE0, 0x01, 0xF1, 0x01, 0xF1, 0x01},
94 {0x1F, 0xFE, 0x1F, 0xFE, 0x0E, 0xFE, 0x0E, 0xFE},
95 {0xFE, 0x1F, 0xFE, 0x1F, 0xFE, 0x0E, 0xFE, 0x0E},
96 {0x01, 0x1F, 0x01, 0x1F, 0x01, 0x0E, 0x01, 0x0E},
97 {0x1F, 0x01, 0x1F, 0x01, 0x0E, 0x01, 0x0E, 0x01},
98 {0xE0, 0xFE, 0xE0, 0xFE, 0xF1, 0xFE, 0xF1, 0xFE},
99 {0xFE, 0xE0, 0xFE, 0xE0, 0xFE, 0xF1, 0xFE, 0xF1}
102 int DES_is_weak_key(const_DES_cblock *key)
106 for (i = 0; i < NUM_WEAK_KEY; i++)
107 if (memcmp(weak_keys[i], key, sizeof(DES_cblock)) == 0)
113 * NOW DEFINED IN des_local.h
114 * See ecb_encrypt.c for a pseudo description of these macros.
115 * #define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\
117 * (a)=((a)^((t)<<(n))))
120 #define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\
121 (a)=(a)^(t)^(t>>(16-(n))))
123 static const DES_LONG des_skb[8][64] = {
125 /* for C bits (numbered as per FIPS 46) 1 2 3 4 5 6 */
126 0x00000000L, 0x00000010L, 0x20000000L, 0x20000010L,
127 0x00010000L, 0x00010010L, 0x20010000L, 0x20010010L,
128 0x00000800L, 0x00000810L, 0x20000800L, 0x20000810L,
129 0x00010800L, 0x00010810L, 0x20010800L, 0x20010810L,
130 0x00000020L, 0x00000030L, 0x20000020L, 0x20000030L,
131 0x00010020L, 0x00010030L, 0x20010020L, 0x20010030L,
132 0x00000820L, 0x00000830L, 0x20000820L, 0x20000830L,
133 0x00010820L, 0x00010830L, 0x20010820L, 0x20010830L,
134 0x00080000L, 0x00080010L, 0x20080000L, 0x20080010L,
135 0x00090000L, 0x00090010L, 0x20090000L, 0x20090010L,
136 0x00080800L, 0x00080810L, 0x20080800L, 0x20080810L,
137 0x00090800L, 0x00090810L, 0x20090800L, 0x20090810L,
138 0x00080020L, 0x00080030L, 0x20080020L, 0x20080030L,
139 0x00090020L, 0x00090030L, 0x20090020L, 0x20090030L,
140 0x00080820L, 0x00080830L, 0x20080820L, 0x20080830L,
141 0x00090820L, 0x00090830L, 0x20090820L, 0x20090830L,
144 /* for C bits (numbered as per FIPS 46) 7 8 10 11 12 13 */
145 0x00000000L, 0x02000000L, 0x00002000L, 0x02002000L,
146 0x00200000L, 0x02200000L, 0x00202000L, 0x02202000L,
147 0x00000004L, 0x02000004L, 0x00002004L, 0x02002004L,
148 0x00200004L, 0x02200004L, 0x00202004L, 0x02202004L,
149 0x00000400L, 0x02000400L, 0x00002400L, 0x02002400L,
150 0x00200400L, 0x02200400L, 0x00202400L, 0x02202400L,
151 0x00000404L, 0x02000404L, 0x00002404L, 0x02002404L,
152 0x00200404L, 0x02200404L, 0x00202404L, 0x02202404L,
153 0x10000000L, 0x12000000L, 0x10002000L, 0x12002000L,
154 0x10200000L, 0x12200000L, 0x10202000L, 0x12202000L,
155 0x10000004L, 0x12000004L, 0x10002004L, 0x12002004L,
156 0x10200004L, 0x12200004L, 0x10202004L, 0x12202004L,
157 0x10000400L, 0x12000400L, 0x10002400L, 0x12002400L,
158 0x10200400L, 0x12200400L, 0x10202400L, 0x12202400L,
159 0x10000404L, 0x12000404L, 0x10002404L, 0x12002404L,
160 0x10200404L, 0x12200404L, 0x10202404L, 0x12202404L,
163 /* for C bits (numbered as per FIPS 46) 14 15 16 17 19 20 */
164 0x00000000L, 0x00000001L, 0x00040000L, 0x00040001L,
165 0x01000000L, 0x01000001L, 0x01040000L, 0x01040001L,
166 0x00000002L, 0x00000003L, 0x00040002L, 0x00040003L,
167 0x01000002L, 0x01000003L, 0x01040002L, 0x01040003L,
168 0x00000200L, 0x00000201L, 0x00040200L, 0x00040201L,
169 0x01000200L, 0x01000201L, 0x01040200L, 0x01040201L,
170 0x00000202L, 0x00000203L, 0x00040202L, 0x00040203L,
171 0x01000202L, 0x01000203L, 0x01040202L, 0x01040203L,
172 0x08000000L, 0x08000001L, 0x08040000L, 0x08040001L,
173 0x09000000L, 0x09000001L, 0x09040000L, 0x09040001L,
174 0x08000002L, 0x08000003L, 0x08040002L, 0x08040003L,
175 0x09000002L, 0x09000003L, 0x09040002L, 0x09040003L,
176 0x08000200L, 0x08000201L, 0x08040200L, 0x08040201L,
177 0x09000200L, 0x09000201L, 0x09040200L, 0x09040201L,
178 0x08000202L, 0x08000203L, 0x08040202L, 0x08040203L,
179 0x09000202L, 0x09000203L, 0x09040202L, 0x09040203L,
182 /* for C bits (numbered as per FIPS 46) 21 23 24 26 27 28 */
183 0x00000000L, 0x00100000L, 0x00000100L, 0x00100100L,
184 0x00000008L, 0x00100008L, 0x00000108L, 0x00100108L,
185 0x00001000L, 0x00101000L, 0x00001100L, 0x00101100L,
186 0x00001008L, 0x00101008L, 0x00001108L, 0x00101108L,
187 0x04000000L, 0x04100000L, 0x04000100L, 0x04100100L,
188 0x04000008L, 0x04100008L, 0x04000108L, 0x04100108L,
189 0x04001000L, 0x04101000L, 0x04001100L, 0x04101100L,
190 0x04001008L, 0x04101008L, 0x04001108L, 0x04101108L,
191 0x00020000L, 0x00120000L, 0x00020100L, 0x00120100L,
192 0x00020008L, 0x00120008L, 0x00020108L, 0x00120108L,
193 0x00021000L, 0x00121000L, 0x00021100L, 0x00121100L,
194 0x00021008L, 0x00121008L, 0x00021108L, 0x00121108L,
195 0x04020000L, 0x04120000L, 0x04020100L, 0x04120100L,
196 0x04020008L, 0x04120008L, 0x04020108L, 0x04120108L,
197 0x04021000L, 0x04121000L, 0x04021100L, 0x04121100L,
198 0x04021008L, 0x04121008L, 0x04021108L, 0x04121108L,
201 /* for D bits (numbered as per FIPS 46) 1 2 3 4 5 6 */
202 0x00000000L, 0x10000000L, 0x00010000L, 0x10010000L,
203 0x00000004L, 0x10000004L, 0x00010004L, 0x10010004L,
204 0x20000000L, 0x30000000L, 0x20010000L, 0x30010000L,
205 0x20000004L, 0x30000004L, 0x20010004L, 0x30010004L,
206 0x00100000L, 0x10100000L, 0x00110000L, 0x10110000L,
207 0x00100004L, 0x10100004L, 0x00110004L, 0x10110004L,
208 0x20100000L, 0x30100000L, 0x20110000L, 0x30110000L,
209 0x20100004L, 0x30100004L, 0x20110004L, 0x30110004L,
210 0x00001000L, 0x10001000L, 0x00011000L, 0x10011000L,
211 0x00001004L, 0x10001004L, 0x00011004L, 0x10011004L,
212 0x20001000L, 0x30001000L, 0x20011000L, 0x30011000L,
213 0x20001004L, 0x30001004L, 0x20011004L, 0x30011004L,
214 0x00101000L, 0x10101000L, 0x00111000L, 0x10111000L,
215 0x00101004L, 0x10101004L, 0x00111004L, 0x10111004L,
216 0x20101000L, 0x30101000L, 0x20111000L, 0x30111000L,
217 0x20101004L, 0x30101004L, 0x20111004L, 0x30111004L,
220 /* for D bits (numbered as per FIPS 46) 8 9 11 12 13 14 */
221 0x00000000L, 0x08000000L, 0x00000008L, 0x08000008L,
222 0x00000400L, 0x08000400L, 0x00000408L, 0x08000408L,
223 0x00020000L, 0x08020000L, 0x00020008L, 0x08020008L,
224 0x00020400L, 0x08020400L, 0x00020408L, 0x08020408L,
225 0x00000001L, 0x08000001L, 0x00000009L, 0x08000009L,
226 0x00000401L, 0x08000401L, 0x00000409L, 0x08000409L,
227 0x00020001L, 0x08020001L, 0x00020009L, 0x08020009L,
228 0x00020401L, 0x08020401L, 0x00020409L, 0x08020409L,
229 0x02000000L, 0x0A000000L, 0x02000008L, 0x0A000008L,
230 0x02000400L, 0x0A000400L, 0x02000408L, 0x0A000408L,
231 0x02020000L, 0x0A020000L, 0x02020008L, 0x0A020008L,
232 0x02020400L, 0x0A020400L, 0x02020408L, 0x0A020408L,
233 0x02000001L, 0x0A000001L, 0x02000009L, 0x0A000009L,
234 0x02000401L, 0x0A000401L, 0x02000409L, 0x0A000409L,
235 0x02020001L, 0x0A020001L, 0x02020009L, 0x0A020009L,
236 0x02020401L, 0x0A020401L, 0x02020409L, 0x0A020409L,
239 /* for D bits (numbered as per FIPS 46) 16 17 18 19 20 21 */
240 0x00000000L, 0x00000100L, 0x00080000L, 0x00080100L,
241 0x01000000L, 0x01000100L, 0x01080000L, 0x01080100L,
242 0x00000010L, 0x00000110L, 0x00080010L, 0x00080110L,
243 0x01000010L, 0x01000110L, 0x01080010L, 0x01080110L,
244 0x00200000L, 0x00200100L, 0x00280000L, 0x00280100L,
245 0x01200000L, 0x01200100L, 0x01280000L, 0x01280100L,
246 0x00200010L, 0x00200110L, 0x00280010L, 0x00280110L,
247 0x01200010L, 0x01200110L, 0x01280010L, 0x01280110L,
248 0x00000200L, 0x00000300L, 0x00080200L, 0x00080300L,
249 0x01000200L, 0x01000300L, 0x01080200L, 0x01080300L,
250 0x00000210L, 0x00000310L, 0x00080210L, 0x00080310L,
251 0x01000210L, 0x01000310L, 0x01080210L, 0x01080310L,
252 0x00200200L, 0x00200300L, 0x00280200L, 0x00280300L,
253 0x01200200L, 0x01200300L, 0x01280200L, 0x01280300L,
254 0x00200210L, 0x00200310L, 0x00280210L, 0x00280310L,
255 0x01200210L, 0x01200310L, 0x01280210L, 0x01280310L,
258 /* for D bits (numbered as per FIPS 46) 22 23 24 25 27 28 */
259 0x00000000L, 0x04000000L, 0x00040000L, 0x04040000L,
260 0x00000002L, 0x04000002L, 0x00040002L, 0x04040002L,
261 0x00002000L, 0x04002000L, 0x00042000L, 0x04042000L,
262 0x00002002L, 0x04002002L, 0x00042002L, 0x04042002L,
263 0x00000020L, 0x04000020L, 0x00040020L, 0x04040020L,
264 0x00000022L, 0x04000022L, 0x00040022L, 0x04040022L,
265 0x00002020L, 0x04002020L, 0x00042020L, 0x04042020L,
266 0x00002022L, 0x04002022L, 0x00042022L, 0x04042022L,
267 0x00000800L, 0x04000800L, 0x00040800L, 0x04040800L,
268 0x00000802L, 0x04000802L, 0x00040802L, 0x04040802L,
269 0x00002800L, 0x04002800L, 0x00042800L, 0x04042800L,
270 0x00002802L, 0x04002802L, 0x00042802L, 0x04042802L,
271 0x00000820L, 0x04000820L, 0x00040820L, 0x04040820L,
272 0x00000822L, 0x04000822L, 0x00040822L, 0x04040822L,
273 0x00002820L, 0x04002820L, 0x00042820L, 0x04042820L,
274 0x00002822L, 0x04002822L, 0x00042822L, 0x04042822L,
278 int DES_set_key(const_DES_cblock *key, DES_key_schedule *schedule)
281 return DES_set_key_checked(key, schedule);
283 DES_set_key_unchecked(key, schedule);
289 * return 0 if key parity is odd (correct),
290 * return -1 if key parity error,
291 * return -2 if illegal weak key.
293 int DES_set_key_checked(const_DES_cblock *key, DES_key_schedule *schedule)
295 if (!DES_check_key_parity(key))
297 if (DES_is_weak_key(key))
299 DES_set_key_unchecked(key, schedule);
303 void DES_set_key_unchecked(const_DES_cblock *key, DES_key_schedule *schedule)
305 static const int shifts2[16] =
306 { 0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0 };
307 register DES_LONG c, d, t, s, t2;
308 register const unsigned char *in;
309 register DES_LONG *k;
312 #ifdef OPENBSD_DEV_CRYPTO
313 memcpy(schedule->key, key, sizeof(schedule->key));
314 schedule->session = NULL;
316 k = &schedule->ks->deslong[0];
323 * do PC1 in 47 simple operations. Thanks to John Fletcher
324 * for the inspiration.
326 PERM_OP(d, c, t, 4, 0x0f0f0f0fL);
327 HPERM_OP(c, t, -2, 0xcccc0000L);
328 HPERM_OP(d, t, -2, 0xcccc0000L);
329 PERM_OP(d, c, t, 1, 0x55555555L);
330 PERM_OP(c, d, t, 8, 0x00ff00ffL);
331 PERM_OP(d, c, t, 1, 0x55555555L);
332 d = (((d & 0x000000ffL) << 16L) | (d & 0x0000ff00L) |
333 ((d & 0x00ff0000L) >> 16L) | ((c & 0xf0000000L) >> 4L));
336 for (i = 0; i < ITERATIONS; i++) {
338 c = ((c >> 2L) | (c << 26L));
339 d = ((d >> 2L) | (d << 26L));
341 c = ((c >> 1L) | (c << 27L));
342 d = ((d >> 1L) | (d << 27L));
347 * could be a few less shifts but I am to lazy at this point in time
350 s = des_skb[0][(c) & 0x3f] |
351 des_skb[1][((c >> 6L) & 0x03) | ((c >> 7L) & 0x3c)] |
352 des_skb[2][((c >> 13L) & 0x0f) | ((c >> 14L) & 0x30)] |
353 des_skb[3][((c >> 20L) & 0x01) | ((c >> 21L) & 0x06) |
354 ((c >> 22L) & 0x38)];
355 t = des_skb[4][(d) & 0x3f] |
356 des_skb[5][((d >> 7L) & 0x03) | ((d >> 8L) & 0x3c)] |
357 des_skb[6][(d >> 15L) & 0x3f] |
358 des_skb[7][((d >> 21L) & 0x0f) | ((d >> 22L) & 0x30)];
360 /* table contained 0213 4657 */
361 t2 = ((t << 16L) | (s & 0x0000ffffL)) & 0xffffffffL;
362 *(k++) = ROTATE(t2, 30) & 0xffffffffL;
364 t2 = ((s >> 16L) | (t & 0xffff0000L));
365 *(k++) = ROTATE(t2, 26) & 0xffffffffL;
369 int DES_key_sched(const_DES_cblock *key, DES_key_schedule *schedule)
371 return DES_set_key(key, schedule);