crypto/heimdal-0.6.3/lib/des/ede_enc.c

   1 /* crypto/des/ede_enc.c */
   2 /* Copyright (C) 1995-1997 Eric Young (eay@mincom.oz.au)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@mincom.oz.au).
   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@mincom.oz.au).
  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@mincom.oz.au)"
  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@mincom.oz.au)"
  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 "des_locl.h"
  60
  61 void des_ede3_cbc_encrypt(input, output, length, ks1, ks2, ks3, ivec, encrypt)
  62 des_cblock (*input);
  63 des_cblock (*output);
  64 long length;
  65 des_key_schedule ks1;
  66 des_key_schedule ks2;
  67 des_key_schedule ks3;
  68 des_cblock (*ivec);
  69 int encrypt;
  70         {
  71         register DES_LONG tin0,tin1;
  72         register DES_LONG tout0,tout1,xor0,xor1;
  73         register unsigned char *in,*out;
  74         register long l=length;
  75         DES_LONG tin[2];
  76         unsigned char *iv;
  77
  78         in=(unsigned char *)input;
  79         out=(unsigned char *)output;
  80         iv=(unsigned char *)ivec;
  81
  82         if (encrypt)
  83                 {
  84                 c2l(iv,tout0);
  85                 c2l(iv,tout1);
  86                 for (l-=8; l>=0; l-=8)
  87                         {
  88                         c2l(in,tin0);
  89                         c2l(in,tin1);
  90                         tin0^=tout0;
  91                         tin1^=tout1;
  92
  93                         tin[0]=tin0;
  94                         tin[1]=tin1;
  95                         des_encrypt3((DES_LONG *)tin,ks1,ks2,ks3);
  96                         tout0=tin[0];
  97                         tout1=tin[1];
  98
  99                         l2c(tout0,out);
 100                         l2c(tout1,out);
 101                         }
 102                 if (l != -8)
 103                         {
 104                         c2ln(in,tin0,tin1,l+8);
 105                         tin0^=tout0;
 106                         tin1^=tout1;
 107
 108                         tin[0]=tin0;
 109                         tin[1]=tin1;
 110                         des_encrypt3((DES_LONG *)tin,ks1,ks2,ks3);
 111                         tout0=tin[0];
 112                         tout1=tin[1];
 113
 114                         l2c(tout0,out);
 115                         l2c(tout1,out);
 116                         }
 117                 iv=(unsigned char *)ivec;
 118                 l2c(tout0,iv);
 119                 l2c(tout1,iv);
 120                 }
 121         else
 122                 {
 123                 register DES_LONG t0,t1;
 124
 125                 c2l(iv,xor0);
 126                 c2l(iv,xor1);
 127                 for (l-=8; l>=0; l-=8)
 128                         {
 129                         c2l(in,tin0);
 130                         c2l(in,tin1);
 131
 132                         t0=tin0;
 133                         t1=tin1;
 134
 135                         tin[0]=tin0;
 136                         tin[1]=tin1;
 137                         des_decrypt3((DES_LONG *)tin,ks1,ks2,ks3);
 138                         tout0=tin[0];
 139                         tout1=tin[1];
 140
 141                         tout0^=xor0;
 142                         tout1^=xor1;
 143                         l2c(tout0,out);
 144                         l2c(tout1,out);
 145                         xor0=t0;
 146                         xor1=t1;
 147                         }
 148                 if (l != -8)
 149                         {
 150                         c2l(in,tin0);
 151                         c2l(in,tin1);
 152
 153                         t0=tin0;
 154                         t1=tin1;
 155
 156                         tin[0]=tin0;
 157                         tin[1]=tin1;
 158                         des_decrypt3((DES_LONG *)tin,ks1,ks2,ks3);
 159                         tout0=tin[0];
 160                         tout1=tin[1];
 161
 162                         tout0^=xor0;
 163                         tout1^=xor1;
 164                         l2cn(tout0,tout1,out,l+8);
 165                         xor0=t0;
 166                         xor1=t1;
 167                         }
 168                 iv=(unsigned char *)ivec;
 169                 l2c(xor0,iv);
 170                 l2c(xor1,iv);
 171                 }
 172         tin0=tin1=tout0=tout1=xor0=xor1=0;
 173         tin[0]=tin[1]=0;
 174         }
 175
 176 #ifdef undef /* MACRO */
 177 void des_ede2_cbc_encrypt(input, output, length, ks1, ks2, ivec, enc)
 178 des_cblock (*input);
 179 des_cblock (*output);
 180 long length;
 181 des_key_schedule ks1;
 182 des_key_schedule ks2;
 183 des_cblock (*ivec);
 184 int enc;
 185         {
 186         des_ede3_cbc_encrypt(input,output,length,ks1,ks2,ks1,ivec,enc);
 187         }
 188 #endif
 189