bsd/crypto/des/des_setkey.c

   1 /*      $FreeBSD: src/sys/crypto/des/des_setkey.c,v 1.1.2.3 2001/07/10 09:46:35 ume Exp $       */
   2 /*      $KAME: des_setkey.c,v 1.6 2001/07/03 14:27:53 itojun Exp $      */
   3
   4 /* crypto/des/set_key.c */
   5 /* Copyright (C) 1995-1996 Eric Young (eay@mincom.oz.au)
   6  * All rights reserved.
   7  *
   8  * This file is part of an SSL implementation written
   9  * by Eric Young (eay@mincom.oz.au).
  10  * The implementation was written so as to conform with Netscapes SSL
  11  * specification.  This library and applications are
  12  * FREE FOR COMMERCIAL AND NON-COMMERCIAL USE
  13  * as long as the following conditions are aheared to.
  14  *
  15  * Copyright remains Eric Young's, and as such any Copyright notices in
  16  * the code are not to be removed.  If this code is used in a product,
  17  * Eric Young should be given attribution as the author of the parts used.
  18  * This can be in the form of a textual message at program startup or
  19  * in documentation (online or textual) provided with the package.
  20  *
  21  * Redistribution and use in source and binary forms, with or without
  22  * modification, are permitted provided that the following conditions
  23  * are met:
  24  * 1. Redistributions of source code must retain the copyright
  25  *    notice, this list of conditions and the following disclaimer.
  26  * 2. Redistributions in binary form must reproduce the above copyright
  27  *    notice, this list of conditions and the following disclaimer in the
  28  *    documentation and/or other materials provided with the distribution.
  29  * 3. All advertising materials mentioning features or use of this software
  30  *    must display the following acknowledgement:
  31  *    This product includes software developed by Eric Young (eay@mincom.oz.au)
  32  *
  33  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  34  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  35  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  36  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  37  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  38  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  39  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  40  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  41  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  42  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  43  * SUCH DAMAGE.
  44  *
  45  * The licence and distribution terms for any publically available version or
  46  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  47  * copied and put under another distribution licence
  48  * [including the GNU Public Licence.]
  49  */
  50
  51 /* set_key.c v 1.4 eay 24/9/91
  52  * 1.4 Speed up by 400% :-)
  53  * 1.3 added register declarations.
  54  * 1.2 unrolled make_key_sched a bit more
  55  * 1.1 added norm_expand_bits
  56  * 1.0 First working version
  57  */
  58 #include <sys/param.h>
  59 #include <sys/systm.h>
  60 #include <crypto/des/des_locl.h>
  61 #include <crypto/des/podd.h>
  62 #include <crypto/des/sk.h>
  63
  64 static int check_parity __P((des_cblock (*)));
  65
  66 int des_check_key=0;
  67
  68 void des_set_odd_parity(key)
  69 des_cblock (*key);
  70         {
  71         int i;
  72
  73         for (i=0; i<DES_KEY_SZ; i++)
  74                 (*key)[i]=odd_parity[(*key)[i]];
  75         }
  76
  77 static int check_parity(key)
  78 des_cblock (*key);
  79         {
  80         int i;
  81
  82         for (i=0; i<DES_KEY_SZ; i++)
  83                 {
  84                 if ((*key)[i] != odd_parity[(*key)[i]])
  85                         return(0);
  86                 }
  87         return(1);
  88         }
  89
  90 /* Weak and semi week keys as take from
  91  * %A D.W. Davies
  92  * %A W.L. Price
  93  * %T Security for Computer Networks
  94  * %I John Wiley & Sons
  95  * %D 1984
  96  * Many thanks to smb@ulysses.att.com (Steven Bellovin) for the reference
  97  * (and actual cblock values).
  98  */
  99 #define NUM_WEAK_KEY    16
 100 static des_cblock weak_keys[NUM_WEAK_KEY]={
 101         /* weak keys */
 102         {0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01},
 103         {0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE},
 104         {0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F},
 105         {0xE0,0xE0,0xE0,0xE0,0xE0,0xE0,0xE0,0xE0},
 106         /* semi-weak keys */
 107         {0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE},
 108         {0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01},
 109         {0x1F,0xE0,0x1F,0xE0,0x0E,0xF1,0x0E,0xF1},
 110         {0xE0,0x1F,0xE0,0x1F,0xF1,0x0E,0xF1,0x0E},
 111         {0x01,0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1},
 112         {0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1,0x01},
 113         {0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E,0xFE},
 114         {0xFE,0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E},
 115         {0x01,0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E},
 116         {0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E,0x01},
 117         {0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1,0xFE},
 118         {0xFE,0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1}};
 119
 120 int des_is_weak_key(key)
 121 des_cblock (*key);
 122         {
 123         int i;
 124
 125         for (i=0; i<NUM_WEAK_KEY; i++)
 126                 /* Added == 0 to comparision, I obviously don't run
 127                  * this section very often :-(, thanks to
 128                  * engineering@MorningStar.Com for the fix
 129                  * eay 93/06/29 */
 130                 if (bcmp(weak_keys[i],key,sizeof(*key)) == 0) return(1);
 131         return(0);
 132         }
 133
 134 /* NOW DEFINED IN des_local.h
 135  * See ecb_encrypt.c for a pseudo description of these macros.
 136  * #define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\
 137  *      (b)^=(t),\
 138  *      (a)=((a)^((t)<<(n))))
 139  */
 140
 141 #define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\
 142         (a)=(a)^(t)^(t>>(16-(n))))
 143
 144 /* return 0 if key parity is odd (correct),
 145  * return -1 if key parity error,
 146  * return -2 if illegal weak key.
 147  */
 148 int des_set_key(key, schedule)
 149 des_cblock (*key);
 150 des_key_schedule schedule;
 151         {
 152         static int shifts2[16]={0,0,1,1,1,1,1,1,0,1,1,1,1,1,1,0};
 153         register DES_LONG c,d,t,s;
 154         register unsigned char *in;
 155         register DES_LONG *k;
 156         register int i;
 157
 158         if (des_check_key)
 159                 {
 160                 if (!check_parity(key))
 161                         return(-1);
 162
 163                 if (des_is_weak_key(key))
 164                         return(-2);
 165                 }
 166
 167         k=(DES_LONG *)schedule;
 168         in=(unsigned char *)key;
 169
 170         c2l(in,c);
 171         c2l(in,d);
 172
 173         /* do PC1 in 60 simple operations */
 174 /*      PERM_OP(d,c,t,4,0x0f0f0f0fL);
 175         HPERM_OP(c,t,-2, 0xcccc0000L);
 176         HPERM_OP(c,t,-1, 0xaaaa0000L);
 177         HPERM_OP(c,t, 8, 0x00ff0000L);
 178         HPERM_OP(c,t,-1, 0xaaaa0000L);
 179         HPERM_OP(d,t,-8, 0xff000000L);
 180         HPERM_OP(d,t, 8, 0x00ff0000L);
 181         HPERM_OP(d,t, 2, 0x33330000L);
 182         d=((d&0x00aa00aaL)<<7L)|((d&0x55005500L)>>7L)|(d&0xaa55aa55L);
 183         d=(d>>8)|((c&0xf0000000L)>>4);
 184         c&=0x0fffffffL; */
 185
 186         /* I now do it in 47 simple operations :-)
 187          * Thanks to John Fletcher (john_fletcher@lccmail.ocf.llnl.gov)
 188          * for the inspiration. :-) */
 189         PERM_OP (d,c,t,4,0x0f0f0f0fL);
 190         HPERM_OP(c,t,-2,0xcccc0000L);
 191         HPERM_OP(d,t,-2,0xcccc0000L);
 192         PERM_OP (d,c,t,1,0x55555555L);
 193         PERM_OP (c,d,t,8,0x00ff00ffL);
 194         PERM_OP (d,c,t,1,0x55555555L);
 195         d=      (((d&0x000000ffL)<<16L)| (d&0x0000ff00L)     |
 196                  ((d&0x00ff0000L)>>16L)|((c&0xf0000000L)>>4L));
 197         c&=0x0fffffffL;
 198
 199         for (i=0; i<ITERATIONS; i++)
 200                 {
 201                 if (shifts2[i])
 202                         { c=((c>>2L)|(c<<26L)); d=((d>>2L)|(d<<26L)); }
 203                 else
 204                         { c=((c>>1L)|(c<<27L)); d=((d>>1L)|(d<<27L)); }
 205                 c&=0x0fffffffL;
 206                 d&=0x0fffffffL;
 207                 /* could be a few less shifts but I am to lazy at this
 208                  * point in time to investigate */
 209                 s=      des_skb[0][ (c    )&0x3f                ]|
 210                         des_skb[1][((c>> 6)&0x03)|((c>> 7L)&0x3c)]|
 211                         des_skb[2][((c>>13)&0x0f)|((c>>14L)&0x30)]|
 212                         des_skb[3][((c>>20)&0x01)|((c>>21L)&0x06) |
 213                                                   ((c>>22L)&0x38)];
 214                 t=      des_skb[4][ (d    )&0x3f                ]|
 215                         des_skb[5][((d>> 7L)&0x03)|((d>> 8L)&0x3c)]|
 216                         des_skb[6][ (d>>15L)&0x3f                ]|
 217                         des_skb[7][((d>>21L)&0x0f)|((d>>22L)&0x30)];
 218
 219                 /* table contained 0213 4657 */
 220                 *(k++)=((t<<16L)|(s&0x0000ffffL))&0xffffffffL;
 221                 s=     ((s>>16L)|(t&0xffff0000L));
 222
 223                 s=(s<<4L)|(s>>28L);
 224                 *(k++)=s&0xffffffffL;
 225                 }
 226         return(0);
 227         }
 228
 229 int des_key_sched(key, schedule)
 230 des_cblock (*key);
 231 des_key_schedule schedule;
 232         {
 233         return(des_set_key(key,schedule));
 234         }