crypto/bf/bf_cbc.c

   1 /* crypto/bf/bf_cbc.c */
   2 /* Copyright (C) 1995-1997 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 "blowfish.h"
  60 #include "bf_locl.h"
  61
  62 void BF_cbc_encrypt(in, out, length, ks, iv, encrypt)
  63 unsigned char *in;
  64 unsigned char *out;
  65 long length;
  66 BF_KEY *ks;
  67 unsigned char *iv;
  68 int encrypt;
  69         {
  70         register BF_LONG tin0,tin1;
  71         register BF_LONG tout0,tout1,xor0,xor1;
  72         register long l=length;
  73         BF_LONG tin[2];
  74
  75         if (encrypt)
  76                 {
  77                 n2l(iv,tout0);
  78                 n2l(iv,tout1);
  79                 iv-=8;
  80                 for (l-=8; l>=0; l-=8)
  81                         {
  82                         n2l(in,tin0);
  83                         n2l(in,tin1);
  84                         tin0^=tout0;
  85                         tin1^=tout1;
  86                         tin[0]=tin0;
  87                         tin[1]=tin1;
  88                         BF_encrypt(tin,ks,BF_ENCRYPT);
  89                         tout0=tin[0];
  90                         tout1=tin[1];
  91                         l2n(tout0,out);
  92                         l2n(tout1,out);
  93                         }
  94                 if (l != -8)
  95                         {
  96                         n2ln(in,tin0,tin1,l+8);
  97                         tin0^=tout0;
  98                         tin1^=tout1;
  99                         tin[0]=tin0;
 100                         tin[1]=tin1;
 101                         BF_encrypt(tin,ks,BF_ENCRYPT);
 102                         tout0=tin[0];
 103                         tout1=tin[1];
 104                         l2n(tout0,out);
 105                         l2n(tout1,out);
 106                         }
 107                 l2n(tout0,iv);
 108                 l2n(tout1,iv);
 109                 }
 110         else
 111                 {
 112                 n2l(iv,xor0);
 113                 n2l(iv,xor1);
 114                 iv-=8;
 115                 for (l-=8; l>=0; l-=8)
 116                         {
 117                         n2l(in,tin0);
 118                         n2l(in,tin1);
 119                         tin[0]=tin0;
 120                         tin[1]=tin1;
 121                         BF_encrypt(tin,ks,BF_DECRYPT);
 122                         tout0=tin[0]^xor0;
 123                         tout1=tin[1]^xor1;
 124                         l2n(tout0,out);
 125                         l2n(tout1,out);
 126                         xor0=tin0;
 127                         xor1=tin1;
 128                         }
 129                 if (l != -8)
 130                         {
 131                         n2l(in,tin0);
 132                         n2l(in,tin1);
 133                         tin[0]=tin0;
 134                         tin[1]=tin1;
 135                         BF_encrypt(tin,ks,BF_DECRYPT);
 136                         tout0=tin[0]^xor0;
 137                         tout1=tin[1]^xor1;
 138                         l2nn(tout0,tout1,out,l+8);
 139                         xor0=tin0;
 140                         xor1=tin1;
 141                         }
 142                 l2n(xor0,iv);
 143                 l2n(xor1,iv);
 144                 }
 145         tin0=tin1=tout0=tout1=xor0=xor1=0;
 146         tin[0]=tin[1]=0;
 147         }
 148