crypto/des/cbc3_enc.c

   1 /* crypto/des/cbc3_enc.c */
   2 /* Copyright (C) 1995-1997 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include "des_locl.h"
  60
  61 /* HAS BUGS? DON'T USE */
  62 void des_3cbc_encrypt(input, output, length, ks1, ks2, iv1, iv2, enc)
  63 des_cblock (*input);
  64 des_cblock (*output);
  65 long length;
  66 des_key_schedule ks1;
  67 des_key_schedule ks2;
  68 des_cblock (*iv1);
  69 des_cblock (*iv2);
  70 int enc;
  71         {
  72         int off=((int)length-1)/8;
  73         long l8=((length+7)/8)*8;
  74         des_cblock niv1,niv2;
  75
  76         if (enc == DES_ENCRYPT)
  77                 {
  78                 des_cbc_encrypt(input,output,length,ks1,iv1,enc);
  79                 if (length >= sizeof(des_cblock))
  80                         memcpy(niv1,output[off],sizeof(des_cblock));
  81                 des_cbc_encrypt(output,output,l8,ks2,iv1,!enc);
  82                 des_cbc_encrypt(output,output,l8,ks1,iv2, enc);
  83                 if (length >= sizeof(des_cblock))
  84                         memcpy(niv2,output[off],sizeof(des_cblock));
  85                 }
  86         else
  87                 {
  88                 if (length >= sizeof(des_cblock))
  89                         memcpy(niv2,input[off],sizeof(des_cblock));
  90                 des_cbc_encrypt(input,output,l8,ks1,iv2,enc);
  91                 des_cbc_encrypt(output,output,l8,ks2,iv1,!enc);
  92                 if (length >= sizeof(des_cblock))
  93                         memcpy(niv1,output[off],sizeof(des_cblock));
  94                 des_cbc_encrypt(output,output,length,ks1,iv1, enc);
  95                 }
  96         memcpy(*iv1,niv1,sizeof(des_cblock));
  97         memcpy(*iv2,niv2,sizeof(des_cblock));
  98         }
  99