crypto/bf/bf_enc.c

   1 /* crypto/bf/bf_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 "blowfish.h"
  60 #include "bf_locl.h"
  61
  62 /* Blowfish as implemented from 'Blowfish: Springer-Verlag paper'
  63  * (From LECTURE NOTES IN COIMPUTER SCIENCE 809, FAST SOFTWARE ENCRYPTION,
  64  * CAMBRIDGE SECURITY WORKSHOP, CAMBRIDGE, U.K., DECEMBER 9-11, 1993)
  65  */
  66
  67 #if (BF_ROUNDS != 16) && (BF_ROUNDS != 20)
  68 If you set BF_ROUNDS to some value other than 16 or 20, you will have
  69 to modify the code.
  70 #endif
  71
  72 void BF_encrypt(data,key,encrypt)
  73 BF_LONG *data;
  74 BF_KEY *key;
  75 int encrypt;
  76         {
  77         register BF_LONG l,r,*p,*s;
  78
  79         p=key->P;
  80         s= &(key->S[0]);
  81         l=data[0];
  82         r=data[1];
  83
  84         if (encrypt)
  85                 {
  86                 l^=p[0];
  87                 BF_ENC(r,l,s,p[ 1]);
  88                 BF_ENC(l,r,s,p[ 2]);
  89                 BF_ENC(r,l,s,p[ 3]);
  90                 BF_ENC(l,r,s,p[ 4]);
  91                 BF_ENC(r,l,s,p[ 5]);
  92                 BF_ENC(l,r,s,p[ 6]);
  93                 BF_ENC(r,l,s,p[ 7]);
  94                 BF_ENC(l,r,s,p[ 8]);
  95                 BF_ENC(r,l,s,p[ 9]);
  96                 BF_ENC(l,r,s,p[10]);
  97                 BF_ENC(r,l,s,p[11]);
  98                 BF_ENC(l,r,s,p[12]);
  99                 BF_ENC(r,l,s,p[13]);
 100                 BF_ENC(l,r,s,p[14]);
 101                 BF_ENC(r,l,s,p[15]);
 102                 BF_ENC(l,r,s,p[16]);
 103 #if BF_ROUNDS == 20
 104                 BF_ENC(r,l,s,p[17]);
 105                 BF_ENC(l,r,s,p[18]);
 106                 BF_ENC(r,l,s,p[19]);
 107                 BF_ENC(l,r,s,p[20]);
 108 #endif
 109                 r^=p[BF_ROUNDS+1];
 110                 }
 111         else
 112                 {
 113                 l^=p[BF_ROUNDS+1];
 114 #if BF_ROUNDS == 20
 115                 BF_ENC(r,l,s,p[20]);
 116                 BF_ENC(l,r,s,p[19]);
 117                 BF_ENC(r,l,s,p[18]);
 118                 BF_ENC(l,r,s,p[17]);
 119 #endif
 120                 BF_ENC(r,l,s,p[16]);
 121                 BF_ENC(l,r,s,p[15]);
 122                 BF_ENC(r,l,s,p[14]);
 123                 BF_ENC(l,r,s,p[13]);
 124                 BF_ENC(r,l,s,p[12]);
 125                 BF_ENC(l,r,s,p[11]);
 126                 BF_ENC(r,l,s,p[10]);
 127                 BF_ENC(l,r,s,p[ 9]);
 128                 BF_ENC(r,l,s,p[ 8]);
 129                 BF_ENC(l,r,s,p[ 7]);
 130                 BF_ENC(r,l,s,p[ 6]);
 131                 BF_ENC(l,r,s,p[ 5]);
 132                 BF_ENC(r,l,s,p[ 4]);
 133                 BF_ENC(l,r,s,p[ 3]);
 134                 BF_ENC(r,l,s,p[ 2]);
 135                 BF_ENC(l,r,s,p[ 1]);
 136                 r^=p[0];
 137                 }
 138         data[1]=l&0xffffffffL;
 139         data[0]=r&0xffffffffL;
 140         }