sys/crypto/des/des_cbc.c

   1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   2  * All rights reserved.
   3  *
   4  * This package is an SSL implementation written
   5  * by Eric Young (eay@cryptsoft.com).
   6  * The implementation was written so as to conform with Netscapes SSL.
   7  *
   8  * This library is free for commercial and non-commercial use as long as
   9  * the following conditions are aheared to.  The following conditions
  10  * apply to all code found in this distribution, be it the RC4, RSA,
  11  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  12  * included with this distribution is covered by the same copyright terms
  13  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  14  *
  15  * Copyright remains Eric Young's, and as such any Copyright notices in
  16  * the code are not to be removed.
  17  * If this package is used in a product, Eric Young should be given attribution
  18  * as the author of the parts of the library used.
  19  * This can be in the form of a textual message at program startup or
  20  * in documentation (online or textual) provided with the package.
  21  *
  22  * Redistribution and use in source and binary forms, with or without
  23  * modification, are permitted provided that the following conditions
  24  * are met:
  25  * 1. Redistributions of source code must retain the copyright
  26  *    notice, this list of conditions and the following disclaimer.
  27  * 2. Redistributions in binary form must reproduce the above copyright
  28  *    notice, this list of conditions and the following disclaimer in the
  29  *    documentation and/or other materials provided with the distribution.
  30  * 3. All advertising materials mentioning features or use of this software
  31  *    must display the following acknowledgement:
  32  *    "This product includes cryptographic software written by
  33  *     Eric Young (eay@cryptsoft.com)"
  34  *    The word 'cryptographic' can be left out if the rouines from the library
  35  *    being used are not cryptographic related :-).
  36  * 4. If you include any Windows specific code (or a derivative thereof) from
  37  *    the apps directory (application code) you must include an acknowledgement:
  38  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  50  * SUCH DAMAGE.
  51  *
  52  * The licence and distribution terms for any publically available version or
  53  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  54  * copied and put under another distribution licence
  55  * [including the GNU Public Licence.]
  56  */
  57
  58 #include <sys/cdefs.h>
  59 __KERNEL_RCSID(0, "$NetBSD: des_cbc.c,v 1.6.6.1 2005/03/04 16:40:52 skrll Exp $");
  60
  61 #include <sys/types.h>
  62
  63 #include <crypto/des/des_locl.h>
  64
  65 void des_ncbc_encrypt(const unsigned char *in, unsigned char *out, long length,
  66              des_key_schedule schedule, des_cblock *ivec, int enc)
  67 {
  68         register DES_LONG tin0,tin1;
  69         register DES_LONG tout0,tout1,xor0,xor1;
  70         register long l=length;
  71         DES_LONG tin[2];
  72         unsigned char *iv;
  73
  74         iv = &(*ivec)[0];
  75
  76         if (enc)
  77                 {
  78                 c2l(iv,tout0);
  79                 c2l(iv,tout1);
  80                 for (l-=8; l>=0; l-=8)
  81                         {
  82                         c2l(in,tin0);
  83                         c2l(in,tin1);
  84                         tin0^=tout0; tin[0]=tin0;
  85                         tin1^=tout1; tin[1]=tin1;
  86                         des_encrypt1((DES_LONG *)tin,schedule,DES_ENCRYPT);
  87                         tout0=tin[0]; l2c(tout0,out);
  88                         tout1=tin[1]; l2c(tout1,out);
  89                         }
  90                 if (l != -8)
  91                         {
  92                         c2ln(in,tin0,tin1,l+8);
  93                         tin0^=tout0; tin[0]=tin0;
  94                         tin1^=tout1; tin[1]=tin1;
  95                         des_encrypt1((DES_LONG *)tin,schedule,DES_ENCRYPT);
  96                         tout0=tin[0]; l2c(tout0,out);
  97                         tout1=tin[1]; l2c(tout1,out);
  98                         }
  99                 iv = &(*ivec)[0];
 100                 l2c(tout0,iv);
 101                 l2c(tout1,iv);
 102                 }
 103         else
 104                 {
 105                 c2l(iv,xor0);
 106                 c2l(iv,xor1);
 107                 for (l-=8; l>=0; l-=8)
 108                         {
 109                         c2l(in,tin0); tin[0]=tin0;
 110                         c2l(in,tin1); tin[1]=tin1;
 111                         des_encrypt1((DES_LONG *)tin,schedule,DES_DECRYPT);
 112                         tout0=tin[0]^xor0;
 113                         tout1=tin[1]^xor1;
 114                         l2c(tout0,out);
 115                         l2c(tout1,out);
 116                         xor0=tin0;
 117                         xor1=tin1;
 118                         }
 119                 if (l != -8)
 120                         {
 121                         c2l(in,tin0); tin[0]=tin0;
 122                         c2l(in,tin1); tin[1]=tin1;
 123                         des_encrypt1((DES_LONG *)tin,schedule,DES_DECRYPT);
 124                         tout0=tin[0]^xor0;
 125                         tout1=tin[1]^xor1;
 126                         l2cn(tout0,tout1,out,l+8);
 127                         xor0=tin0;
 128                         xor1=tin1;
 129                         }
 130                 iv = &(*ivec)[0];
 131                 l2c(xor0,iv);
 132                 l2c(xor1,iv);
 133                 }
 134         tin0=tin1=tout0=tout1=xor0=xor1=0;
 135         tin[0]=tin[1]=0;
 136 }
 137
 138 void des_ede3_cbc_encrypt(const unsigned char *input, unsigned char *output,
 139              long length, des_key_schedule ks1, des_key_schedule ks2,
 140              des_key_schedule ks3, des_cblock *ivec, int enc)
 141 {
 142         register DES_LONG tin0,tin1;
 143         register DES_LONG tout0,tout1,xor0,xor1;
 144         register const unsigned char *in;
 145         unsigned char *out;
 146         register long l=length;
 147         DES_LONG tin[2];
 148         unsigned char *iv;
 149
 150         in=input;
 151         out=output;
 152         iv = &(*ivec)[0];
 153
 154         if (enc)
 155                 {
 156                 c2l(iv,tout0);
 157                 c2l(iv,tout1);
 158                 for (l-=8; l>=0; l-=8)
 159                         {
 160                         c2l(in,tin0);
 161                         c2l(in,tin1);
 162                         tin0^=tout0;
 163                         tin1^=tout1;
 164
 165                         tin[0]=tin0;
 166                         tin[1]=tin1;
 167                         des_encrypt3((DES_LONG *)tin,ks1,ks2,ks3);
 168                         tout0=tin[0];
 169                         tout1=tin[1];
 170
 171                         l2c(tout0,out);
 172                         l2c(tout1,out);
 173                         }
 174                 if (l != -8)
 175                         {
 176                         c2ln(in,tin0,tin1,l+8);
 177                         tin0^=tout0;
 178                         tin1^=tout1;
 179
 180                         tin[0]=tin0;
 181                         tin[1]=tin1;
 182                         des_encrypt3((DES_LONG *)tin,ks1,ks2,ks3);
 183                         tout0=tin[0];
 184                         tout1=tin[1];
 185
 186                         l2c(tout0,out);
 187                         l2c(tout1,out);
 188                         }
 189                 iv = &(*ivec)[0];
 190                 l2c(tout0,iv);
 191                 l2c(tout1,iv);
 192                 }
 193         else
 194                 {
 195                 register DES_LONG t0,t1;
 196
 197                 c2l(iv,xor0);
 198                 c2l(iv,xor1);
 199                 for (l-=8; l>=0; l-=8)
 200                         {
 201                         c2l(in,tin0);
 202                         c2l(in,tin1);
 203
 204                         t0=tin0;
 205                         t1=tin1;
 206
 207                         tin[0]=tin0;
 208                         tin[1]=tin1;
 209                         des_decrypt3((DES_LONG *)tin,ks1,ks2,ks3);
 210                         tout0=tin[0];
 211                         tout1=tin[1];
 212
 213                         tout0^=xor0;
 214                         tout1^=xor1;
 215                         l2c(tout0,out);
 216                         l2c(tout1,out);
 217                         xor0=t0;
 218                         xor1=t1;
 219                         }
 220                 if (l != -8)
 221                         {
 222                         c2l(in,tin0);
 223                         c2l(in,tin1);
 224
 225                         t0=tin0;
 226                         t1=tin1;
 227
 228                         tin[0]=tin0;
 229                         tin[1]=tin1;
 230                         des_decrypt3((DES_LONG *)tin,ks1,ks2,ks3);
 231                         tout0=tin[0];
 232                         tout1=tin[1];
 233
 234                         tout0^=xor0;
 235                         tout1^=xor1;
 236                         l2cn(tout0,tout1,out,l+8);
 237                         xor0=t0;
 238                         xor1=t1;
 239                         }
 240
 241                 iv = &(*ivec)[0];
 242                 l2c(xor0,iv);
 243                 l2c(xor1,iv);
 244                 }
 245         tin0=tin1=tout0=tout1=xor0=xor1=0;
 246         tin[0]=tin[1]=0;
 247 }