crypto/external/bsd/openssl/lib/libdes/oncbc_enc.c

   1 /* crypto/des/ncbc_enc.c */
   2 /*
   3  * #included by:
   4  *    cbc_enc.c  (des_cbc_encrypt)
   5  *    des_enc.c  (des_ncbc_encrypt)
   6  */
   7 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   8  * All rights reserved.
   9  *
  10  * This package is an SSL implementation written
  11  * by Eric Young (eay@cryptsoft.com).
  12  * The implementation was written so as to conform with Netscapes SSL.
  13  *
  14  * This library is free for commercial and non-commercial use as long as
  15  * the following conditions are aheared to.  The following conditions
  16  * apply to all code found in this distribution, be it the RC4, RSA,
  17  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  18  * included with this distribution is covered by the same copyright terms
  19  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  20  *
  21  * Copyright remains Eric Young's, and as such any Copyright notices in
  22  * the code are not to be removed.
  23  * If this package is used in a product, Eric Young should be given attribution
  24  * as the author of the parts of the library used.
  25  * This can be in the form of a textual message at program startup or
  26  * in documentation (online or textual) provided with the package.
  27  *
  28  * Redistribution and use in source and binary forms, with or without
  29  * modification, are permitted provided that the following conditions
  30  * are met:
  31  * 1. Redistributions of source code must retain the copyright
  32  *    notice, this list of conditions and the following disclaimer.
  33  * 2. Redistributions in binary form must reproduce the above copyright
  34  *    notice, this list of conditions and the following disclaimer in the
  35  *    documentation and/or other materials provided with the distribution.
  36  * 3. All advertising materials mentioning features or use of this software
  37  *    must display the following acknowledgement:
  38  *    "This product includes cryptographic software written by
  39  *     Eric Young (eay@cryptsoft.com)"
  40  *    The word 'cryptographic' can be left out if the rouines from the library
  41  *    being used are not cryptographic related :-).
  42  * 4. If you include any Windows specific code (or a derivative thereof) from
  43  *    the apps directory (application code) you must include an acknowledgement:
  44  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  45  *
  46  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  47  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  48  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  49  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  50  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  51  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  52  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  53  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  54  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  55  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  56  * SUCH DAMAGE.
  57  *
  58  * The licence and distribution terms for any publically available version or
  59  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  60  * copied and put under another distribution licence
  61  * [including the GNU Public Licence.]
  62  */
  63
  64 #include "des_locl.h"
  65
  66 #ifdef CBC_ENC_C__DONT_UPDATE_IV
  67 void des_cbc_encrypt(const unsigned char *in, unsigned char *out, long length,
  68              des_key_schedule schedule, des_cblock *ivec, int enc)
  69 #else
  70 void des_ncbc_encrypt(const unsigned char *in, unsigned char *out, long length,
  71              des_key_schedule schedule, des_cblock *ivec, int enc)
  72 #endif
  73         {
  74         register DES_LONG tin0,tin1;
  75         register DES_LONG tout0,tout1,xor0,xor1;
  76         register long l=length;
  77         DES_LONG tin[2];
  78         unsigned char *iv;
  79
  80         iv = &(*ivec)[0];
  81
  82         if (enc)
  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; tin[0]=tin0;
  91                         tin1^=tout1; tin[1]=tin1;
  92                         des_encrypt1((DES_LONG *)tin,schedule,DES_ENCRYPT);
  93                         tout0=tin[0]; l2c(tout0,out);
  94                         tout1=tin[1]; l2c(tout1,out);
  95                         }
  96                 if (l != -8)
  97                         {
  98                         c2ln(in,tin0,tin1,l+8);
  99                         tin0^=tout0; tin[0]=tin0;
 100                         tin1^=tout1; tin[1]=tin1;
 101                         des_encrypt1((DES_LONG *)tin,schedule,DES_ENCRYPT);
 102                         tout0=tin[0]; l2c(tout0,out);
 103                         tout1=tin[1]; l2c(tout1,out);
 104                         }
 105 #ifndef CBC_ENC_C__DONT_UPDATE_IV
 106                 iv = &(*ivec)[0];
 107                 l2c(tout0,iv);
 108                 l2c(tout1,iv);
 109 #endif
 110                 }
 111         else
 112                 {
 113                 c2l(iv,xor0);
 114                 c2l(iv,xor1);
 115                 for (l-=8; l>=0; l-=8)
 116                         {
 117                         c2l(in,tin0); tin[0]=tin0;
 118                         c2l(in,tin1); tin[1]=tin1;
 119                         des_encrypt1((DES_LONG *)tin,schedule,DES_DECRYPT);
 120                         tout0=tin[0]^xor0;
 121                         tout1=tin[1]^xor1;
 122                         l2c(tout0,out);
 123                         l2c(tout1,out);
 124                         xor0=tin0;
 125                         xor1=tin1;
 126                         }
 127                 if (l != -8)
 128                         {
 129                         c2l(in,tin0); tin[0]=tin0;
 130                         c2l(in,tin1); tin[1]=tin1;
 131                         des_encrypt1((DES_LONG *)tin,schedule,DES_DECRYPT);
 132                         tout0=tin[0]^xor0;
 133                         tout1=tin[1]^xor1;
 134                         l2cn(tout0,tout1,out,l+8);
 135 #ifndef CBC_ENC_C__DONT_UPDATE_IV
 136                         xor0=tin0;
 137                         xor1=tin1;
 138 #endif
 139                         }
 140 #ifndef CBC_ENC_C__DONT_UPDATE_IV
 141                 iv = &(*ivec)[0];
 142                 l2c(xor0,iv);
 143                 l2c(xor1,iv);
 144 #endif
 145                 }
 146         tin0=tin1=tout0=tout1=xor0=xor1=0;
 147         tin[0]=tin[1]=0;
 148         }