crypto/des/ncbc_enc.c

   1 /*-
   2  * #included by:
   3  *    cbc_enc.c  (DES_cbc_encrypt)
   4  *    des_enc.c  (DES_ncbc_encrypt)
   5  */
   6 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   7  * All rights reserved.
   8  *
   9  * This package is an SSL implementation written
  10  * by Eric Young (eay@cryptsoft.com).
  11  * The implementation was written so as to conform with Netscapes SSL.
  12  *
  13  * This library is free for commercial and non-commercial use as long as
  14  * the following conditions are aheared to.  The following conditions
  15  * apply to all code found in this distribution, be it the RC4, RSA,
  16  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  17  * included with this distribution is covered by the same copyright terms
  18  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  19  *
  20  * Copyright remains Eric Young's, and as such any Copyright notices in
  21  * the code are not to be removed.
  22  * If this package is used in a product, Eric Young should be given attribution
  23  * as the author of the parts of the library used.
  24  * This can be in the form of a textual message at program startup or
  25  * in documentation (online or textual) provided with the package.
  26  *
  27  * Redistribution and use in source and binary forms, with or without
  28  * modification, are permitted provided that the following conditions
  29  * are met:
  30  * 1. Redistributions of source code must retain the copyright
  31  *    notice, this list of conditions and the following disclaimer.
  32  * 2. Redistributions in binary form must reproduce the above copyright
  33  *    notice, this list of conditions and the following disclaimer in the
  34  *    documentation and/or other materials provided with the distribution.
  35  * 3. All advertising materials mentioning features or use of this software
  36  *    must display the following acknowledgement:
  37  *    "This product includes cryptographic software written by
  38  *     Eric Young (eay@cryptsoft.com)"
  39  *    The word 'cryptographic' can be left out if the rouines from the library
  40  *    being used are not cryptographic related :-).
  41  * 4. If you include any Windows specific code (or a derivative thereof) from
  42  *    the apps directory (application code) you must include an acknowledgement:
  43  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55  * SUCH DAMAGE.
  56  *
  57  * The licence and distribution terms for any publically available version or
  58  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  59  * copied and put under another distribution licence
  60  * [including the GNU Public Licence.]
  61  */
  62
  63 #include "des_locl.h"
  64
  65 #ifdef CBC_ENC_C__DONT_UPDATE_IV
  66 void DES_cbc_encrypt(const unsigned char *in, unsigned char *out, long length,
  67                      DES_key_schedule *_schedule, DES_cblock *ivec, int enc)
  68 #else
  69 void DES_ncbc_encrypt(const unsigned char *in, unsigned char *out,
  70                       long length, DES_key_schedule *_schedule,
  71                       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         c2l(iv, tout0);
  84         c2l(iv, tout1);
  85         for (l -= 8; l >= 0; l -= 8) {
  86             c2l(in, tin0);
  87             c2l(in, tin1);
  88             tin0 ^= tout0;
  89             tin[0] = tin0;
  90             tin1 ^= tout1;
  91             tin[1] = tin1;
  92             DES_encrypt1((DES_LONG *)tin, _schedule, DES_ENCRYPT);
  93             tout0 = tin[0];
  94             l2c(tout0, out);
  95             tout1 = tin[1];
  96             l2c(tout1, out);
  97         }
  98         if (l != -8) {
  99             c2ln(in, tin0, tin1, l + 8);
 100             tin0 ^= tout0;
 101             tin[0] = tin0;
 102             tin1 ^= tout1;
 103             tin[1] = tin1;
 104             DES_encrypt1((DES_LONG *)tin, _schedule, DES_ENCRYPT);
 105             tout0 = tin[0];
 106             l2c(tout0, out);
 107             tout1 = tin[1];
 108             l2c(tout1, out);
 109         }
 110 #ifndef CBC_ENC_C__DONT_UPDATE_IV
 111         iv = &(*ivec)[0];
 112         l2c(tout0, iv);
 113         l2c(tout1, iv);
 114 #endif
 115     } else {
 116         c2l(iv, xor0);
 117         c2l(iv, xor1);
 118         for (l -= 8; l >= 0; l -= 8) {
 119             c2l(in, tin0);
 120             tin[0] = tin0;
 121             c2l(in, tin1);
 122             tin[1] = tin1;
 123             DES_encrypt1((DES_LONG *)tin, _schedule, DES_DECRYPT);
 124             tout0 = tin[0] ^ xor0;
 125             tout1 = tin[1] ^ xor1;
 126             l2c(tout0, out);
 127             l2c(tout1, out);
 128             xor0 = tin0;
 129             xor1 = tin1;
 130         }
 131         if (l != -8) {
 132             c2l(in, tin0);
 133             tin[0] = tin0;
 134             c2l(in, tin1);
 135             tin[1] = tin1;
 136             DES_encrypt1((DES_LONG *)tin, _schedule, DES_DECRYPT);
 137             tout0 = tin[0] ^ xor0;
 138             tout1 = tin[1] ^ xor1;
 139             l2cn(tout0, tout1, out, l + 8);
 140 #ifndef CBC_ENC_C__DONT_UPDATE_IV
 141             xor0 = tin0;
 142             xor1 = tin1;
 143 #endif
 144         }
 145 #ifndef CBC_ENC_C__DONT_UPDATE_IV
 146         iv = &(*ivec)[0];
 147         l2c(xor0, iv);
 148         l2c(xor1, iv);
 149 #endif
 150     }
 151     tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
 152     tin[0] = tin[1] = 0;
 153 }