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