The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)

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FreeBSD/Linux Kernel Cross Reference
sys/crypto/blowfish/bf_enc.c

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    1 /*      $FreeBSD$       */
    2 /*      $KAME: bf_enc.c,v 1.7 2002/02/27 01:33:59 itojun Exp $  */
    3 
    4 /* crypto/bf/bf_enc.c */
    5 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
    6  * All rights reserved.
    7  *
    8  * This package is an SSL implementation written
    9  * by Eric Young (eay@cryptsoft.com).
   10  * The implementation was written so as to conform with Netscapes SSL.
   11  *
   12  * This library is free for commercial and non-commercial use as long as
   13  * the following conditions are aheared to.  The following conditions
   14  * apply to all code found in this distribution, be it the RC4, RSA,
   15  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
   16  * included with this distribution is covered by the same copyright terms
   17  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
   18  *
   19  * Copyright remains Eric Young's, and as such any Copyright notices in
   20  * the code are not to be removed.
   21  * If this package is used in a product, Eric Young should be given attribution
   22  * as the author of the parts of the library used.
   23  * This can be in the form of a textual message at program startup or
   24  * in documentation (online or textual) provided with the package.
   25  *
   26  * Redistribution and use in source and binary forms, with or without
   27  * modification, are permitted provided that the following conditions
   28  * are met:
   29  * 1. Redistributions of source code must retain the copyright
   30  *    notice, this list of conditions and the following disclaimer.
   31  * 2. Redistributions in binary form must reproduce the above copyright
   32  *    notice, this list of conditions and the following disclaimer in the
   33  *    documentation and/or other materials provided with the distribution.
   34  * 3. All advertising materials mentioning features or use of this software
   35  *    must display the following acknowledgement:
   36  *    "This product includes cryptographic software written by
   37  *     Eric Young (eay@cryptsoft.com)"
   38  *    The word 'cryptographic' can be left out if the rouines from the library
   39  *    being used are not cryptographic related :-).
   40  * 4. If you include any Windows specific code (or a derivative thereof) from
   41  *    the apps directory (application code) you must include an acknowledgement:
   42  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
   43  *
   44  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
   45  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   46  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   47  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   48  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   49  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   50  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   51  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   52  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   53  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   54  * SUCH DAMAGE.
   55  *
   56  * The licence and distribution terms for any publically available version or
   57  * derivative of this code cannot be changed.  i.e. this code cannot simply be
   58  * copied and put under another distribution licence
   59  * [including the GNU Public Licence.]
   60  */
   61 
   62 #include <sys/types.h>
   63 #include <crypto/blowfish/blowfish.h>
   64 #include <crypto/blowfish/bf_locl.h>
   65 
   66 /* Blowfish as implemented from 'Blowfish: Springer-Verlag paper'
   67  * (From LECTURE NOTES IN COIMPUTER SCIENCE 809, FAST SOFTWARE ENCRYPTION,
   68  * CAMBRIDGE SECURITY WORKSHOP, CAMBRIDGE, U.K., DECEMBER 9-11, 1993)
   69  */
   70 
   71 #if (BF_ROUNDS != 16) && (BF_ROUNDS != 20)
   72 If you set BF_ROUNDS to some value other than 16 or 20, you will have
   73 to modify the code.
   74 #endif
   75 
   76 /* XXX "data" is host endian */
   77 void
   78 BF_encrypt(data, key)
   79         BF_LONG *data;
   80         BF_KEY *key;
   81 {
   82         register BF_LONG l, r, *p, *s;
   83 
   84         p = key->P;
   85         s= &key->S[0];
   86         l = data[0];
   87         r = data[1];
   88 
   89         l^=p[0];
   90         BF_ENC(r, l, s, p[ 1]);
   91         BF_ENC(l, r, s, p[ 2]);
   92         BF_ENC(r, l, s, p[ 3]);
   93         BF_ENC(l, r, s, p[ 4]);
   94         BF_ENC(r, l, s, p[ 5]);
   95         BF_ENC(l, r, s, p[ 6]);
   96         BF_ENC(r, l, s, p[ 7]);
   97         BF_ENC(l, r, s, p[ 8]);
   98         BF_ENC(r, l, s, p[ 9]);
   99         BF_ENC(l, r, s, p[10]);
  100         BF_ENC(r, l, s, p[11]);
  101         BF_ENC(l, r, s, p[12]);
  102         BF_ENC(r, l, s, p[13]);
  103         BF_ENC(l, r, s, p[14]);
  104         BF_ENC(r, l, s, p[15]);
  105         BF_ENC(l, r, s, p[16]);
  106 #if BF_ROUNDS == 20
  107         BF_ENC(r, l, s, p[17]);
  108         BF_ENC(l, r, s, p[18]);
  109         BF_ENC(r, l, s, p[19]);
  110         BF_ENC(l, r, s, p[20]);
  111 #endif
  112         r ^= p[BF_ROUNDS + 1];
  113 
  114         data[1] = l & 0xffffffff;
  115         data[0] = r & 0xffffffff;
  116 }
  117 
  118 /* XXX "data" is host endian */
  119 void
  120 BF_decrypt(data, key)
  121         BF_LONG *data;
  122         BF_KEY *key;
  123 {
  124         register BF_LONG l, r, *p, *s;
  125 
  126         p = key->P;
  127         s= &key->S[0];
  128         l = data[0];
  129         r = data[1];
  130 
  131         l ^= p[BF_ROUNDS + 1];
  132 #if BF_ROUNDS == 20
  133         BF_ENC(r, l, s, p[20]);
  134         BF_ENC(l, r, s, p[19]);
  135         BF_ENC(r, l, s, p[18]);
  136         BF_ENC(l, r, s, p[17]);
  137 #endif
  138         BF_ENC(r, l, s, p[16]);
  139         BF_ENC(l, r, s, p[15]);
  140         BF_ENC(r, l, s, p[14]);
  141         BF_ENC(l, r, s, p[13]);
  142         BF_ENC(r, l, s, p[12]);
  143         BF_ENC(l, r, s, p[11]);
  144         BF_ENC(r, l, s, p[10]);
  145         BF_ENC(l, r, s, p[ 9]);
  146         BF_ENC(r, l, s, p[ 8]);
  147         BF_ENC(l, r, s, p[ 7]);
  148         BF_ENC(r, l, s, p[ 6]);
  149         BF_ENC(l, r, s, p[ 5]);
  150         BF_ENC(r, l, s, p[ 4]);
  151         BF_ENC(l, r, s, p[ 3]);
  152         BF_ENC(r, l, s, p[ 2]);
  153         BF_ENC(l, r, s, p[ 1]);
  154         r ^= p[0];
  155 
  156         data[1] = l & 0xffffffff;
  157         data[0] = r & 0xffffffff;
  158 }

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