crypto/openssl/crypto/des/ncbc_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,
  71                       long length, DES_key_schedule *_schedule,
  72                       DES_cblock *ivec, int enc)
  73 #endif
  74 {
  75     register DES_LONG tin0, tin1;
  76     register DES_LONG tout0, tout1, xor0, xor1;
  77     register long l = length;
  78     DES_LONG tin[2];
  79     unsigned char *iv;
  80
  81     iv = &(*ivec)[0];
  82
  83     if (enc) {
  84         c2l(iv, tout0);
  85         c2l(iv, tout1);
  86         for (l -= 8; l >= 0; l -= 8) {
  87             c2l(in, tin0);
  88             c2l(in, tin1);
  89             tin0 ^= tout0;
  90             tin[0] = tin0;
  91             tin1 ^= tout1;
  92             tin[1] = tin1;
  93             DES_encrypt1((DES_LONG *)tin, _schedule, DES_ENCRYPT);
  94             tout0 = tin[0];
  95             l2c(tout0, out);
  96             tout1 = tin[1];
  97             l2c(tout1, out);
  98         }
  99         if (l != -8) {
 100             c2ln(in, tin0, tin1, l + 8);
 101             tin0 ^= tout0;
 102             tin[0] = tin0;
 103             tin1 ^= tout1;
 104             tin[1] = tin1;
 105             DES_encrypt1((DES_LONG *)tin, _schedule, DES_ENCRYPT);
 106             tout0 = tin[0];
 107             l2c(tout0, out);
 108             tout1 = tin[1];
 109             l2c(tout1, out);
 110         }
 111 #ifndef CBC_ENC_C__DONT_UPDATE_IV
 112         iv = &(*ivec)[0];
 113         l2c(tout0, iv);
 114         l2c(tout1, iv);
 115 #endif
 116     } else {
 117         c2l(iv, xor0);
 118         c2l(iv, xor1);
 119         for (l -= 8; l >= 0; l -= 8) {
 120             c2l(in, tin0);
 121             tin[0] = tin0;
 122             c2l(in, tin1);
 123             tin[1] = tin1;
 124             DES_encrypt1((DES_LONG *)tin, _schedule, DES_DECRYPT);
 125             tout0 = tin[0] ^ xor0;
 126             tout1 = tin[1] ^ xor1;
 127             l2c(tout0, out);
 128             l2c(tout1, out);
 129             xor0 = tin0;
 130             xor1 = tin1;
 131         }
 132         if (l != -8) {
 133             c2l(in, tin0);
 134             tin[0] = tin0;
 135             c2l(in, tin1);
 136             tin[1] = tin1;
 137             DES_encrypt1((DES_LONG *)tin, _schedule, DES_DECRYPT);
 138             tout0 = tin[0] ^ xor0;
 139             tout1 = tin[1] ^ xor1;
 140             l2cn(tout0, tout1, out, l + 8);
 141 #ifndef CBC_ENC_C__DONT_UPDATE_IV
 142             xor0 = tin0;
 143             xor1 = tin1;
 144 #endif
 145         }
 146 #ifndef CBC_ENC_C__DONT_UPDATE_IV
 147         iv = &(*ivec)[0];
 148         l2c(xor0, iv);
 149         l2c(xor1, iv);
 150 #endif
 151     }
 152     tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
 153     tin[0] = tin[1] = 0;
 154 }