release/src-rt-6.x.4708/router/openssl/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 /*
  62  * This version of crypt has been developed from my MIT compatible DES
  63  * library. 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 #ifndef DES_UNROLL
 100         register int i;
 101
 102         for (i = 0; i < 32; i += 4) {
 103             D_ENCRYPT(l, r, i + 0); /* 1 */
 104             D_ENCRYPT(r, l, i + 2); /* 2 */
 105         }
 106 #else
 107         D_ENCRYPT(l, r, 0);     /* 1 */
 108         D_ENCRYPT(r, l, 2);     /* 2 */
 109         D_ENCRYPT(l, r, 4);     /* 3 */
 110         D_ENCRYPT(r, l, 6);     /* 4 */
 111         D_ENCRYPT(l, r, 8);     /* 5 */
 112         D_ENCRYPT(r, l, 10);    /* 6 */
 113         D_ENCRYPT(l, r, 12);    /* 7 */
 114         D_ENCRYPT(r, l, 14);    /* 8 */
 115         D_ENCRYPT(l, r, 16);    /* 9 */
 116         D_ENCRYPT(r, l, 18);    /* 10 */
 117         D_ENCRYPT(l, r, 20);    /* 11 */
 118         D_ENCRYPT(r, l, 22);    /* 12 */
 119         D_ENCRYPT(l, r, 24);    /* 13 */
 120         D_ENCRYPT(r, l, 26);    /* 14 */
 121         D_ENCRYPT(l, r, 28);    /* 15 */
 122         D_ENCRYPT(r, l, 30);    /* 16 */
 123 #endif
 124
 125         t = l;
 126         l = r;
 127         r = t;
 128     }
 129     l = ROTATE(l, 3) & 0xffffffffL;
 130     r = ROTATE(r, 3) & 0xffffffffL;
 131
 132     PERM_OP(l, r, t, 1, 0x55555555L);
 133     PERM_OP(r, l, t, 8, 0x00ff00ffL);
 134     PERM_OP(l, r, t, 2, 0x33333333L);
 135     PERM_OP(r, l, t, 16, 0x0000ffffL);
 136     PERM_OP(l, r, t, 4, 0x0f0f0f0fL);
 137
 138     out[0] = r;
 139     out[1] = l;
 140 }