crypto/des/set_key.c

   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_GLOBAL int des_check_key=0;
  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
  88 void des_set_odd_parity(des_cblock *key)
  89         {
  90         int i;
  91
  92         for (i=0; i<DES_KEY_SZ; i++)
  93                 (*key)[i]=odd_parity[(*key)[i]];
  94         }
  95
  96 int des_check_key_parity(const_des_cblock *key)
  97         {
  98         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 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
 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
 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  */
 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
 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         k = &schedule->ks.deslong[0];
 346         in = &(*key)[0];
 347
 348         c2l(in,c);
 349         c2l(in,d);
 350
 351         /* do PC1 in 47 simple operations :-)
 352          * Thanks to John Fletcher (john_fletcher@lccmail.ocf.llnl.gov)
 353          * for the inspiration. :-) */
 354         PERM_OP (d,c,t,4,0x0f0f0f0fL);
 355         HPERM_OP(c,t,-2,0xcccc0000L);
 356         HPERM_OP(d,t,-2,0xcccc0000L);
 357         PERM_OP (d,c,t,1,0x55555555L);
 358         PERM_OP (c,d,t,8,0x00ff00ffL);
 359         PERM_OP (d,c,t,1,0x55555555L);
 360         d=      (((d&0x000000ffL)<<16L)| (d&0x0000ff00L)     |
 361                  ((d&0x00ff0000L)>>16L)|((c&0xf0000000L)>>4L));
 362         c&=0x0fffffffL;
 363
 364         for (i=0; i<ITERATIONS; i++)
 365                 {
 366                 if (shifts2[i])
 367                         { c=((c>>2L)|(c<<26L)); d=((d>>2L)|(d<<26L)); }
 368                 else
 369                         { c=((c>>1L)|(c<<27L)); d=((d>>1L)|(d<<27L)); }
 370                 c&=0x0fffffffL;
 371                 d&=0x0fffffffL;
 372                 /* could be a few less shifts but I am to lazy at this
 373                  * point in time to investigate */
 374                 s=      des_skb[0][ (c    )&0x3f                ]|
 375                         des_skb[1][((c>> 6L)&0x03)|((c>> 7L)&0x3c)]|
 376                         des_skb[2][((c>>13L)&0x0f)|((c>>14L)&0x30)]|
 377                         des_skb[3][((c>>20L)&0x01)|((c>>21L)&0x06) |
 378                                                   ((c>>22L)&0x38)];
 379                 t=      des_skb[4][ (d    )&0x3f                ]|
 380                         des_skb[5][((d>> 7L)&0x03)|((d>> 8L)&0x3c)]|
 381                         des_skb[6][ (d>>15L)&0x3f                ]|
 382                         des_skb[7][((d>>21L)&0x0f)|((d>>22L)&0x30)];
 383
 384                 /* table contained 0213 4657 */
 385                 t2=((t<<16L)|(s&0x0000ffffL))&0xffffffffL;
 386                 *(k++)=ROTATE(t2,30)&0xffffffffL;
 387
 388                 t2=((s>>16L)|(t&0xffff0000L));
 389                 *(k++)=ROTATE(t2,26)&0xffffffffL;
 390                 }
 391         }
 392
 393 int des_key_sched(const_des_cblock *key, des_key_schedule schedule)
 394         {
 395         return(des_set_key(key,schedule));
 396         }
 397
 398 #undef des_fixup_key_parity
 399 void des_fixup_key_parity(des_cblock *key)
 400         {
 401         des_set_odd_parity(key);
 402         }