crypto/des/ede_cbcm_enc.c

   1 /* ede_cbcm_enc.c */
   2 /* Written by Ben Laurie <ben@algroup.co.uk> for the OpenSSL
   3  * project 13 Feb 1999.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    licensing@OpenSSL.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  *
  53  * This product includes cryptographic software written by Eric Young
  54  * (eay@cryptsoft.com).  This product includes software written by Tim
  55  * Hudson (tjh@cryptsoft.com).
  56  *
  57  */
  58
  59 /*
  60
  61 This is an implementation of Triple DES Cipher Block Chaining with Output
  62 Feedback Masking, by Coppersmith, Johnson and Matyas, (IBM and Certicom).
  63
  64 Note that there is a known attack on this by Biham and Knudsen but it takes
  65 a lot of work:
  66
  67 http://www.cs.technion.ac.il/users/wwwb/cgi-bin/tr-get.cgi/1998/CS/CS0928.ps.gz
  68
  69 */
  70
  71 #include "des_locl.h"
  72
  73 void des_ede3_cbcm_encrypt(const unsigned char *in, unsigned char *out,
  74              long length, des_key_schedule ks1, des_key_schedule ks2,
  75              des_key_schedule ks3, des_cblock ivec1, des_cblock ivec2, int enc)
  76     {
  77     register DES_LONG tin0,tin1;
  78     register DES_LONG tout0,tout1,xor0,xor1,m0,m1;
  79     register long l=length;
  80     DES_LONG tin[2];
  81     unsigned char *iv1,*iv2;
  82
  83     iv1=ivec1;
  84     iv2=ivec2;
  85
  86     if (enc)
  87         {
  88         c2l(iv1,m0);
  89         c2l(iv1,m1);
  90         c2l(iv2,tout0);
  91         c2l(iv2,tout1);
  92         for (l-=8; l>=-7; l-=8)
  93             {
  94             tin[0]=m0;
  95             tin[1]=m1;
  96             des_encrypt(tin,ks3,1);
  97             m0=tin[0];
  98             m1=tin[1];
  99
 100             if(l < 0)
 101                 {
 102                 c2ln(in,tin0,tin1,l+8);
 103                 }
 104             else
 105                 {
 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_encrypt(tin,ks1,1);
 115             tin[0]^=m0;
 116             tin[1]^=m1;
 117             des_encrypt(tin,ks2,0);
 118             tin[0]^=m0;
 119             tin[1]^=m1;
 120             des_encrypt(tin,ks1,1);
 121             tout0=tin[0];
 122             tout1=tin[1];
 123
 124             l2c(tout0,out);
 125             l2c(tout1,out);
 126             }
 127         iv1=ivec1;
 128         l2c(m0,iv1);
 129         l2c(m1,iv1);
 130
 131         iv2=ivec2;
 132         l2c(tout0,iv2);
 133         l2c(tout1,iv2);
 134         }
 135     else
 136         {
 137         register DES_LONG t0,t1;
 138
 139         c2l(iv1,m0);
 140         c2l(iv1,m1);
 141         c2l(iv2,xor0);
 142         c2l(iv2,xor1);
 143         for (l-=8; l>=-7; l-=8)
 144             {
 145             tin[0]=m0;
 146             tin[1]=m1;
 147             des_encrypt(tin,ks3,1);
 148             m0=tin[0];
 149             m1=tin[1];
 150
 151             c2l(in,tin0);
 152             c2l(in,tin1);
 153
 154             t0=tin0;
 155             t1=tin1;
 156
 157             tin[0]=tin0;
 158             tin[1]=tin1;
 159             des_encrypt(tin,ks1,0);
 160             tin[0]^=m0;
 161             tin[1]^=m1;
 162             des_encrypt(tin,ks2,1);
 163             tin[0]^=m0;
 164             tin[1]^=m1;
 165             des_encrypt(tin,ks1,0);
 166             tout0=tin[0];
 167             tout1=tin[1];
 168
 169             tout0^=xor0;
 170             tout1^=xor1;
 171             if(l < 0)
 172                 {
 173                 l2cn(tout0,tout1,out,l+8);
 174                 }
 175             else
 176                 {
 177                 l2c(tout0,out);
 178                 l2c(tout1,out);
 179                 }
 180             xor0=t0;
 181             xor1=t1;
 182             }
 183
 184         iv1=ivec1;
 185         l2c(m0,iv1);
 186         l2c(m1,iv1);
 187
 188         iv2=ivec2;
 189         l2c(xor0,iv2);
 190         l2c(xor1,iv2);
 191         }
 192     tin0=tin1=tout0=tout1=xor0=xor1=0;
 193     tin[0]=tin[1]=0;
 194     }