lib/libcrypto/cast/c_enc.c

   1 /* $OpenBSD: c_enc.c,v 1.7 2014/10/28 07:35:58 jsg Exp $ */
   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 <openssl/cast.h>
  60 #include "cast_lcl.h"
  61
  62 #ifndef OPENBSD_CAST_ASM
  63 void CAST_encrypt(CAST_LONG *data, const CAST_KEY *key)
  64         {
  65         CAST_LONG l,r,t;
  66         const CAST_LONG *k;
  67
  68         k= &(key->data[0]);
  69         l=data[0];
  70         r=data[1];
  71
  72         E_CAST( 0,k,l,r,+,^,-);
  73         E_CAST( 1,k,r,l,^,-,+);
  74         E_CAST( 2,k,l,r,-,+,^);
  75         E_CAST( 3,k,r,l,+,^,-);
  76         E_CAST( 4,k,l,r,^,-,+);
  77         E_CAST( 5,k,r,l,-,+,^);
  78         E_CAST( 6,k,l,r,+,^,-);
  79         E_CAST( 7,k,r,l,^,-,+);
  80         E_CAST( 8,k,l,r,-,+,^);
  81         E_CAST( 9,k,r,l,+,^,-);
  82         E_CAST(10,k,l,r,^,-,+);
  83         E_CAST(11,k,r,l,-,+,^);
  84         if(!key->short_key)
  85             {
  86             E_CAST(12,k,l,r,+,^,-);
  87             E_CAST(13,k,r,l,^,-,+);
  88             E_CAST(14,k,l,r,-,+,^);
  89             E_CAST(15,k,r,l,+,^,-);
  90             }
  91
  92         data[1]=l&0xffffffffL;
  93         data[0]=r&0xffffffffL;
  94         }
  95
  96 void CAST_decrypt(CAST_LONG *data, const CAST_KEY *key)
  97         {
  98         CAST_LONG l,r,t;
  99         const CAST_LONG *k;
 100
 101         k= &(key->data[0]);
 102         l=data[0];
 103         r=data[1];
 104
 105         if(!key->short_key)
 106             {
 107             E_CAST(15,k,l,r,+,^,-);
 108             E_CAST(14,k,r,l,-,+,^);
 109             E_CAST(13,k,l,r,^,-,+);
 110             E_CAST(12,k,r,l,+,^,-);
 111             }
 112         E_CAST(11,k,l,r,-,+,^);
 113         E_CAST(10,k,r,l,^,-,+);
 114         E_CAST( 9,k,l,r,+,^,-);
 115         E_CAST( 8,k,r,l,-,+,^);
 116         E_CAST( 7,k,l,r,^,-,+);
 117         E_CAST( 6,k,r,l,+,^,-);
 118         E_CAST( 5,k,l,r,-,+,^);
 119         E_CAST( 4,k,r,l,^,-,+);
 120         E_CAST( 3,k,l,r,+,^,-);
 121         E_CAST( 2,k,r,l,-,+,^);
 122         E_CAST( 1,k,l,r,^,-,+);
 123         E_CAST( 0,k,r,l,+,^,-);
 124
 125         data[1]=l&0xffffffffL;
 126         data[0]=r&0xffffffffL;
 127         }
 128 #endif
 129
 130 void CAST_cbc_encrypt(const unsigned char *in, unsigned char *out, long length,
 131              const CAST_KEY *ks, unsigned char *iv, int enc)
 132         {
 133         CAST_LONG tin0,tin1;
 134         CAST_LONG tout0,tout1,xor0,xor1;
 135         long l=length;
 136         CAST_LONG tin[2];
 137
 138         if (enc)
 139                 {
 140                 n2l(iv,tout0);
 141                 n2l(iv,tout1);
 142                 iv-=8;
 143                 for (l-=8; l>=0; l-=8)
 144                         {
 145                         n2l(in,tin0);
 146                         n2l(in,tin1);
 147                         tin0^=tout0;
 148                         tin1^=tout1;
 149                         tin[0]=tin0;
 150                         tin[1]=tin1;
 151                         CAST_encrypt(tin,ks);
 152                         tout0=tin[0];
 153                         tout1=tin[1];
 154                         l2n(tout0,out);
 155                         l2n(tout1,out);
 156                         }
 157                 if (l != -8)
 158                         {
 159                         n2ln(in,tin0,tin1,l+8);
 160                         tin0^=tout0;
 161                         tin1^=tout1;
 162                         tin[0]=tin0;
 163                         tin[1]=tin1;
 164                         CAST_encrypt(tin,ks);
 165                         tout0=tin[0];
 166                         tout1=tin[1];
 167                         l2n(tout0,out);
 168                         l2n(tout1,out);
 169                         }
 170                 l2n(tout0,iv);
 171                 l2n(tout1,iv);
 172                 }
 173         else
 174                 {
 175                 n2l(iv,xor0);
 176                 n2l(iv,xor1);
 177                 iv-=8;
 178                 for (l-=8; l>=0; l-=8)
 179                         {
 180                         n2l(in,tin0);
 181                         n2l(in,tin1);
 182                         tin[0]=tin0;
 183                         tin[1]=tin1;
 184                         CAST_decrypt(tin,ks);
 185                         tout0=tin[0]^xor0;
 186                         tout1=tin[1]^xor1;
 187                         l2n(tout0,out);
 188                         l2n(tout1,out);
 189                         xor0=tin0;
 190                         xor1=tin1;
 191                         }
 192                 if (l != -8)
 193                         {
 194                         n2l(in,tin0);
 195                         n2l(in,tin1);
 196                         tin[0]=tin0;
 197                         tin[1]=tin1;
 198                         CAST_decrypt(tin,ks);
 199                         tout0=tin[0]^xor0;
 200                         tout1=tin[1]^xor1;
 201                         l2nn(tout0,tout1,out,l+8);
 202                         xor0=tin0;
 203                         xor1=tin1;
 204                         }
 205                 l2n(xor0,iv);
 206                 l2n(xor1,iv);
 207                 }
 208         tin0=tin1=tout0=tout1=xor0=xor1=0;
 209         tin[0]=tin[1]=0;
 210         }