sys/crypto/blowfish/bf_cbc.c

   1 /*      $NetBSD: bf_cbc.c,v 1.8.6.5 2005/11/10 14:02:59 skrll Exp $     */
   2
   3 /* crypto/bf/bf_cbc.c */
   4 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   5  * All rights reserved.
   6  *
   7  * This package is an SSL implementation written
   8  * by Eric Young (eay@cryptsoft.com).
   9  * The implementation was written so as to conform with Netscapes SSL.
  10  *
  11  * This library is free for commercial and non-commercial use as long as
  12  * the following conditions are aheared to.  The following conditions
  13  * apply to all code found in this distribution, be it the RC4, RSA,
  14  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  15  * included with this distribution is covered by the same copyright terms
  16  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  17  *
  18  * Copyright remains Eric Young's, and as such any Copyright notices in
  19  * the code are not to be removed.
  20  * If this package is used in a product, Eric Young should be given attribution
  21  * as the author of the parts of the library used.
  22  * This can be in the form of a textual message at program startup or
  23  * in documentation (online or textual) provided with the package.
  24  *
  25  * Redistribution and use in source and binary forms, with or without
  26  * modification, are permitted provided that the following conditions
  27  * are met:
  28  * 1. Redistributions of source code must retain the copyright
  29  *    notice, this list of conditions and the following disclaimer.
  30  * 2. Redistributions in binary form must reproduce the above copyright
  31  *    notice, this list of conditions and the following disclaimer in the
  32  *    documentation and/or other materials provided with the distribution.
  33  * 3. All advertising materials mentioning features or use of this software
  34  *    must display the following acknowledgement:
  35  *    "This product includes cryptographic software written by
  36  *     Eric Young (eay@cryptsoft.com)"
  37  *    The word 'cryptographic' can be left out if the rouines from the library
  38  *    being used are not cryptographic related :-).
  39  * 4. If you include any Windows specific code (or a derivative thereof) from
  40  *    the apps directory (application code) you must include an acknowledgement:
  41  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  42  *
  43  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  44  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  45  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  46  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  47  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  48  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  49  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  50  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  51  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  52  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  53  * SUCH DAMAGE.
  54  *
  55  * The licence and distribution terms for any publically available version or
  56  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  57  * copied and put under another distribution licence
  58  * [including the GNU Public Licence.]
  59  */
  60
  61 #include <sys/cdefs.h>
  62 __KERNEL_RCSID(0, "$NetBSD: bf_cbc.c,v 1.8.6.5 2005/11/10 14:02:59 skrll Exp $");
  63
  64 #include <sys/types.h>
  65
  66 #include <crypto/blowfish/blowfish.h>
  67 #include "bf_locl.h"
  68
  69 void BF_cbc_encrypt(const unsigned char *in, unsigned char *out, long length,
  70              const BF_KEY *schedule, unsigned char *ivec, int encrypt)
  71         {
  72         register BF_LONG tin0,tin1;
  73         register BF_LONG tout0,tout1,xor0,xor1;
  74         register long l=length;
  75         BF_LONG tin[2];
  76
  77         if (encrypt)
  78                 {
  79                 n2l(ivec,tout0);
  80                 n2l(ivec,tout1);
  81                 ivec-=8;
  82                 for (l-=8; l>=0; l-=8)
  83                         {
  84                         n2l(in,tin0);
  85                         n2l(in,tin1);
  86                         tin0^=tout0;
  87                         tin1^=tout1;
  88                         tin[0]=tin0;
  89                         tin[1]=tin1;
  90                         BF_encrypt(tin,(const BF_KEY *)schedule);
  91                         tout0=tin[0];
  92                         tout1=tin[1];
  93                         l2n(tout0,out);
  94                         l2n(tout1,out);
  95                         }
  96                 if (l != -8)
  97                         {
  98                         n2ln(in,tin0,tin1,l+8);
  99                         tin0^=tout0;
 100                         tin1^=tout1;
 101                         tin[0]=tin0;
 102                         tin[1]=tin1;
 103                         BF_encrypt(tin,(const BF_KEY *)schedule);
 104                         tout0=tin[0];
 105                         tout1=tin[1];
 106                         l2n(tout0,out);
 107                         l2n(tout1,out);
 108                         }
 109                 l2n(tout0,ivec);
 110                 l2n(tout1,ivec);
 111                 }
 112         else
 113                 {
 114                 n2l(ivec,xor0);
 115                 n2l(ivec,xor1);
 116                 ivec-=8;
 117                 for (l-=8; l>=0; l-=8)
 118                         {
 119                         n2l(in,tin0);
 120                         n2l(in,tin1);
 121                         tin[0]=tin0;
 122                         tin[1]=tin1;
 123                         BF_decrypt(tin,(const BF_KEY *)schedule);
 124                         tout0=tin[0]^xor0;
 125                         tout1=tin[1]^xor1;
 126                         l2n(tout0,out);
 127                         l2n(tout1,out);
 128                         xor0=tin0;
 129                         xor1=tin1;
 130                         }
 131                 if (l != -8)
 132                         {
 133                         n2l(in,tin0);
 134                         n2l(in,tin1);
 135                         tin[0]=tin0;
 136                         tin[1]=tin1;
 137                         BF_decrypt(tin,(const BF_KEY *)schedule);
 138                         tout0=tin[0]^xor0;
 139                         tout1=tin[1]^xor1;
 140                         l2nn(tout0,tout1,out,l+8);
 141                         xor0=tin0;
 142                         xor1=tin1;
 143                         }
 144                 l2n(xor0,ivec);
 145                 l2n(xor1,ivec);
 146                 }
 147         tin0=tin1=tout0=tout1=xor0=xor1=0;
 148         tin[0]=tin[1]=0;
 149         }
 150