crypto/openssl-0.9/crypto/des/fcrypt_b.c

   1 /* crypto/des/fcrypt_b.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 #include <stdio.h>
  60
  61 /* This version of crypt has been developed from my MIT compatible
  62  * DES library.
  63  * The library is available at pub/Crypto/DES at ftp.psy.uq.oz.au
  64  * Eric Young (eay@cryptsoft.com)
  65  */
  66
  67 #define DES_FCRYPT
  68 #include "des_locl.h"
  69 #undef DES_FCRYPT
  70
  71 #undef PERM_OP
  72 #define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\
  73         (b)^=(t),\
  74         (a)^=((t)<<(n)))
  75
  76 #undef HPERM_OP
  77 #define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\
  78         (a)=(a)^(t)^(t>>(16-(n))))\
  79
  80 void fcrypt_body(DES_LONG *out, DES_key_schedule *ks, DES_LONG Eswap0,
  81                  DES_LONG Eswap1)
  82         {
  83         register DES_LONG l,r,t,u;
  84 #ifdef DES_PTR
  85         register const unsigned char *des_SP=(const unsigned char *)DES_SPtrans;
  86 #endif
  87         register DES_LONG *s;
  88         register int j;
  89         register DES_LONG E0,E1;
  90
  91         l=0;
  92         r=0;
  93
  94         s=(DES_LONG *)ks;
  95         E0=Eswap0;
  96         E1=Eswap1;
  97
  98         for (j=0; j<25; j++)
  99                 {
 100 #ifndef DES_UNROLL
 101                 register int i;
 102
 103                 for (i=0; i<32; i+=8)
 104                         {
 105                         D_ENCRYPT(l,r,i+0); /*  1 */
 106                         D_ENCRYPT(r,l,i+2); /*  2 */
 107                         D_ENCRYPT(l,r,i+4); /*  1 */
 108                         D_ENCRYPT(r,l,i+6); /*  2 */
 109                         }
 110 #else
 111                 D_ENCRYPT(l,r, 0); /*  1 */
 112                 D_ENCRYPT(r,l, 2); /*  2 */
 113                 D_ENCRYPT(l,r, 4); /*  3 */
 114                 D_ENCRYPT(r,l, 6); /*  4 */
 115                 D_ENCRYPT(l,r, 8); /*  5 */
 116                 D_ENCRYPT(r,l,10); /*  6 */
 117                 D_ENCRYPT(l,r,12); /*  7 */
 118                 D_ENCRYPT(r,l,14); /*  8 */
 119                 D_ENCRYPT(l,r,16); /*  9 */
 120                 D_ENCRYPT(r,l,18); /*  10 */
 121                 D_ENCRYPT(l,r,20); /*  11 */
 122                 D_ENCRYPT(r,l,22); /*  12 */
 123                 D_ENCRYPT(l,r,24); /*  13 */
 124                 D_ENCRYPT(r,l,26); /*  14 */
 125                 D_ENCRYPT(l,r,28); /*  15 */
 126                 D_ENCRYPT(r,l,30); /*  16 */
 127 #endif
 128
 129                 t=l;
 130                 l=r;
 131                 r=t;
 132                 }
 133         l=ROTATE(l,3)&0xffffffffL;
 134         r=ROTATE(r,3)&0xffffffffL;
 135
 136         PERM_OP(l,r,t, 1,0x55555555L);
 137         PERM_OP(r,l,t, 8,0x00ff00ffL);
 138         PERM_OP(l,r,t, 2,0x33333333L);
 139         PERM_OP(r,l,t,16,0x0000ffffL);
 140         PERM_OP(l,r,t, 4,0x0f0f0f0fL);
 141
 142         out[0]=r;
 143         out[1]=l;
 144         }
 145