FreeBSD/Linux Kernel Cross Reference
sys/crypto/set_key.c

     /*      $OpenBSD: set_key.c,v 1.5 2021/03/12 10:22:46 jsg Exp $ */
     
     /* lib/des/set_key.c */
     /* Copyright (C) 1995 Eric Young (eay@mincom.oz.au)
      * All rights reserved.
      * 
      * This file is part of an SSL implementation written
      * by Eric Young (eay@mincom.oz.au).
      * The implementation was written so as to conform with Netscapes SSL
     * specification.  This library and applications are
     * FREE FOR COMMERCIAL AND NON-COMMERCIAL USE
     * as long as the following conditions are aheared to.
     * 
     * Copyright remains Eric Young's, and as such any Copyright notices in
     * the code are not to be removed.  If this code is used in a product,
     * Eric Young should be given attribution as the author of the parts used.
     * This can be in the form of a textual message at program startup or
     * in documentation (online or textual) provided with the package.
     * 
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *    This product includes software developed by Eric Young (eay@mincom.oz.au)
     * 
     * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     * 
     * The licence and distribution terms for any publically available version or
     * derivative of this code cannot be changed.  i.e. this code cannot simply be
     * copied and put under another distribution licence
     * [including the GNU Public Licence.]
     */
    
    /* set_key.c v 1.4 eay 24/9/91
     * 1.4 Speed up by 400% :-)
     * 1.3 added register declarations.
     * 1.2 unrolled make_key_sched a bit more
     * 1.1 added norm_expand_bits
     * 1.0 First working version
     */
    #include "des_locl.h"
    #include "podd.h"
    #include "sk.h"
    
    static int check_parity(des_cblock (*key));
    
    int des_check_key=0;
    
    static int
    check_parity(des_cblock (*key))
    {
            int i;
    
            for (i = 0; i < DES_KEY_SZ; i++) {
                    if ((*key)[i] != odd_parity[(*key)[i]])
                            return(0);
            }
            return (1);
    }
    
    /* Weak and semi week keys as take from
     * %A D.W. Davies
     * %A W.L. Price
     * %T Security for Computer Networks
     * %I John Wiley & Sons
     * %D 1984
     * Many thanks to smb@ulysses.att.com (Steven Bellovin) for the reference
     * (and actual cblock values).
     */
    #define NUM_WEAK_KEY    16
    static des_cblock weak_keys[NUM_WEAK_KEY]={
            /* weak keys */
            {0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01},
            {0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE},
            {0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F},
            {0xE0,0xE0,0xE0,0xE0,0xE0,0xE0,0xE0,0xE0},
            /* semi-weak keys */
            {0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE},
            {0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01},
            {0x1F,0xE0,0x1F,0xE0,0x0E,0xF1,0x0E,0xF1},
            {0xE0,0x1F,0xE0,0x1F,0xF1,0x0E,0xF1,0x0E},
            {0x01,0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1},
            {0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1,0x01},
           {0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E,0xFE},
           {0xFE,0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E},
           {0x01,0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E},
           {0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E,0x01},
           {0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1,0xFE},
           {0xFE,0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1}};
   
   int
   des_is_weak_key(des_cblock (*key))
   {
           int i;
   
           for (i = 0; i < NUM_WEAK_KEY; i++) {
                   /* Added == 0 to comparison, I obviously don't run
                    * this section very often :-(, thanks to
                    * engineering@MorningStar.Com for the fix
                    * eay 93/06/29 */
                   if (bcmp(weak_keys[i], key, sizeof(des_cblock)) == 0)
                           return (1);
           }
           return (0);
   }
   
   /* NOW DEFINED IN des_local.h
    * See ecb_encrypt.c for a pseudo description of these macros. 
    * #define PERM_OP(a, b, t, n, m) ((t) = ((((a) >> (n))^(b)) & (m)),\
    *      (b)^=(t),\
    *      (a) = ((a)^((t) << (n))))
    */
   
   #define HPERM_OP(a, t, n, m) ((t) = ((((a) << (16 - (n)))^(a)) & (m)),\
           (a) = (a)^(t)^(t >> (16 - (n))))
   
   static int shifts2[16]={0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0};
   
   /* return 0 if key parity is odd (correct),
    * return -1 if key parity error,
    * return -2 if illegal weak key.
    */
   int
   des_set_key(des_cblock (*key), des_key_schedule schedule)
   {
           register u_int32_t c, d, t, s;
           register unsigned char *in;
           register u_int32_t *k;
           register int i;
   
           if (des_check_key) {
                   if (!check_parity(key))
                           return(-1);
   
                   if (des_is_weak_key(key))
                           return(-2);
           }
   
           k = (u_int32_t *) schedule;
           in = (unsigned char *) key;
   
           c2l(in, c);
           c2l(in, d);
   
           /* do PC1 in 60 simple operations */ 
   /*      PERM_OP(d, c, t, 4, 0x0f0f0f0fL);
           HPERM_OP(c, t, -2, 0xcccc0000L);
           HPERM_OP(c, t, -1, 0xaaaa0000L);
           HPERM_OP(c, t, 8, 0x00ff0000L);
           HPERM_OP(c, t, -1, 0xaaaa0000L);
           HPERM_OP(d, t, -8, 0xff000000L);
           HPERM_OP(d, t, 8, 0x00ff0000L);
           HPERM_OP(d, t, 2, 0x33330000L);
           d = ((d & 0x00aa00aaL) << 7L) | ((d & 0x55005500L) >> 7L) | (d & 0xaa55aa55L);
           d = (d >> 8) | ((c & 0xf0000000L) >> 4);
           c &= 0x0fffffffL; */
   
           /* I now do it in 47 simple operations :-)
            * Thanks to John Fletcher (john_fletcher@lccmail.ocf.llnl.gov)
            * for the inspiration. :-) */
           PERM_OP (d, c, t, 4, 0x0f0f0f0fL);
           HPERM_OP(c, t, -2, 0xcccc0000L);
           HPERM_OP(d, t, -2, 0xcccc0000L);
           PERM_OP (d, c, t, 1, 0x55555555L);
           PERM_OP (c, d, t, 8, 0x00ff00ffL);
           PERM_OP (d, c, t, 1, 0x55555555L);
           d = (((d & 0x000000ffL) << 16L) | (d & 0x0000ff00L) |
                ((d & 0x00ff0000L) >> 16L) | ((c & 0xf0000000L) >> 4L));
           c &= 0x0fffffffL;
   
           for (i = 0; i < ITERATIONS; i++) {
                   if (shifts2[i])
                           { c = ((c >> 2L) | (c << 26L)); d = ((d >> 2L) | (d << 26L)); }
                   else
                           { c = ((c >> 1L) | (c << 27L)); d = ((d >> 1L) | (d << 27L)); }
                   c &= 0x0fffffffL;
                   d &= 0x0fffffffL;
                   /* could be a few less shifts but I am to lazy at this
                    * point in time to investigate */
                   s = des_skb[0][ (c    ) & 0x3f                ]|
                       des_skb[1][((c >> 6) & 0x03) | ((c >> 7L) & 0x3c)]|
                       des_skb[2][((c >> 13) & 0x0f) | ((c >> 14L) & 0x30)]|
                       des_skb[3][((c >> 20) & 0x01) | ((c >> 21L) & 0x06) |
                                                     ((c >> 22L) & 0x38)];
                   t = des_skb[4][ (d    ) & 0x3f                ]|
                       des_skb[5][((d >> 7L) & 0x03) | ((d >> 8L) & 0x3c)]|
                       des_skb[6][ (d >> 15L) & 0x3f                ]|
                       des_skb[7][((d >> 21L) & 0x0f) | ((d >> 22L) & 0x30)];
   
                   /* table contained 0213 4657 */
                   *(k++) = ((t << 16L) | (s & 0x0000ffffL)) & 0xffffffffL;
                   s = ((s >> 16L) | (t & 0xffff0000L));
                   
                   s = (s << 4L) | (s >> 28L);
                   *(k++) = s & 0xffffffffL;
           }
           return (0);
   }

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