crypto/des/ede_cbcm_enc.c

   1 /* ede_cbcm_enc.c */
   2 /*
   3  * Written by Ben Laurie <ben@algroup.co.uk> for the OpenSSL project 13 Feb
   4  * 1999.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    licensing@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59
  60 /*
  61  *
  62  * This is an implementation of Triple DES Cipher Block Chaining with Output
  63  * Feedback Masking, by Coppersmith, Johnson and Matyas, (IBM and Certicom).
  64  *
  65  * Note that there is a known attack on this by Biham and Knudsen but it
  66  * takes a lot of work:
  67  *
  68  * http://www.cs.technion.ac.il/users/wwwb/cgi-bin/tr-get.cgi/1998/CS/CS0928.ps.gz
  69  *
  70  */
  71
  72 #include <openssl/opensslconf.h> /* To see if OPENSSL_NO_DESCBCM is defined */
  73
  74 #ifndef OPENSSL_NO_DESCBCM
  75 # include "des_locl.h"
  76
  77 void DES_ede3_cbcm_encrypt(const unsigned char *in, unsigned char *out,
  78                            long length, DES_key_schedule *ks1,
  79                            DES_key_schedule *ks2, DES_key_schedule *ks3,
  80                            DES_cblock *ivec1, DES_cblock *ivec2, int enc)
  81 {
  82     register DES_LONG tin0, tin1;
  83     register DES_LONG tout0, tout1, xor0, xor1, m0, m1;
  84     register long l = length;
  85     DES_LONG tin[2];
  86     unsigned char *iv1, *iv2;
  87
  88     iv1 = &(*ivec1)[0];
  89     iv2 = &(*ivec2)[0];
  90
  91     if (enc) {
  92         c2l(iv1, m0);
  93         c2l(iv1, m1);
  94         c2l(iv2, tout0);
  95         c2l(iv2, tout1);
  96         for (l -= 8; l >= -7; l -= 8) {
  97             tin[0] = m0;
  98             tin[1] = m1;
  99             DES_encrypt1(tin, ks3, 1);
 100             m0 = tin[0];
 101             m1 = tin[1];
 102
 103             if (l < 0) {
 104                 c2ln(in, tin0, tin1, l + 8);
 105             } else {
 106                 c2l(in, tin0);
 107                 c2l(in, tin1);
 108             }
 109             tin0 ^= tout0;
 110             tin1 ^= tout1;
 111
 112             tin[0] = tin0;
 113             tin[1] = tin1;
 114             DES_encrypt1(tin, ks1, 1);
 115             tin[0] ^= m0;
 116             tin[1] ^= m1;
 117             DES_encrypt1(tin, ks2, 0);
 118             tin[0] ^= m0;
 119             tin[1] ^= m1;
 120             DES_encrypt1(tin, ks1, 1);
 121             tout0 = tin[0];
 122             tout1 = tin[1];
 123
 124             l2c(tout0, out);
 125             l2c(tout1, out);
 126         }
 127         iv1 = &(*ivec1)[0];
 128         l2c(m0, iv1);
 129         l2c(m1, iv1);
 130
 131         iv2 = &(*ivec2)[0];
 132         l2c(tout0, iv2);
 133         l2c(tout1, iv2);
 134     } else {
 135         register DES_LONG t0, t1;
 136
 137         c2l(iv1, m0);
 138         c2l(iv1, m1);
 139         c2l(iv2, xor0);
 140         c2l(iv2, xor1);
 141         for (l -= 8; l >= -7; l -= 8) {
 142             tin[0] = m0;
 143             tin[1] = m1;
 144             DES_encrypt1(tin, ks3, 1);
 145             m0 = tin[0];
 146             m1 = tin[1];
 147
 148             c2l(in, tin0);
 149             c2l(in, tin1);
 150
 151             t0 = tin0;
 152             t1 = tin1;
 153
 154             tin[0] = tin0;
 155             tin[1] = tin1;
 156             DES_encrypt1(tin, ks1, 0);
 157             tin[0] ^= m0;
 158             tin[1] ^= m1;
 159             DES_encrypt1(tin, ks2, 1);
 160             tin[0] ^= m0;
 161             tin[1] ^= m1;
 162             DES_encrypt1(tin, ks1, 0);
 163             tout0 = tin[0];
 164             tout1 = tin[1];
 165
 166             tout0 ^= xor0;
 167             tout1 ^= xor1;
 168             if (l < 0) {
 169                 l2cn(tout0, tout1, out, l + 8);
 170             } else {
 171                 l2c(tout0, out);
 172                 l2c(tout1, out);
 173             }
 174             xor0 = t0;
 175             xor1 = t1;
 176         }
 177
 178         iv1 = &(*ivec1)[0];
 179         l2c(m0, iv1);
 180         l2c(m1, iv1);
 181
 182         iv2 = &(*ivec2)[0];
 183         l2c(xor0, iv2);
 184         l2c(xor1, iv2);
 185     }
 186     tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
 187     tin[0] = tin[1] = 0;
 188 }
 189 #endif