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 /*      $KAME: bf_enc.c,v 1.7 2002/02/27 01:33:59 itojun Exp $  */
    2 
    3 /* crypto/bf/bf_enc.c */
    4 
    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/cdefs.h>
   63 __FBSDID("$FreeBSD: releng/10.1/sys/crypto/blowfish/bf_enc.c 116174 2003-06-10 21:44:29Z obrien $");
   64 
   65 #include <sys/types.h>
   66 #include <crypto/blowfish/blowfish.h>
   67 #include <crypto/blowfish/bf_locl.h>
   68 
   69 /* Blowfish as implemented from 'Blowfish: Springer-Verlag paper'
   70  * (From LECTURE NOTES IN COIMPUTER SCIENCE 809, FAST SOFTWARE ENCRYPTION,
   71  * CAMBRIDGE SECURITY WORKSHOP, CAMBRIDGE, U.K., DECEMBER 9-11, 1993)
   72  */
   73 
   74 #if (BF_ROUNDS != 16) && (BF_ROUNDS != 20)
   75 If you set BF_ROUNDS to some value other than 16 or 20, you will have
   76 to modify the code.
   77 #endif
   78 
   79 /* XXX "data" is host endian */
   80 void
   81 BF_encrypt(data, key)
   82         BF_LONG *data;
   83         BF_KEY *key;
   84 {
   85         register BF_LONG l, r, *p, *s;
   86 
   87         p = key->P;
   88         s= &key->S[0];
   89         l = data[0];
   90         r = data[1];
   91 
   92         l^=p[0];
   93         BF_ENC(r, l, s, p[ 1]);
   94         BF_ENC(l, r, s, p[ 2]);
   95         BF_ENC(r, l, s, p[ 3]);
   96         BF_ENC(l, r, s, p[ 4]);
   97         BF_ENC(r, l, s, p[ 5]);
   98         BF_ENC(l, r, s, p[ 6]);
   99         BF_ENC(r, l, s, p[ 7]);
  100         BF_ENC(l, r, s, p[ 8]);
  101         BF_ENC(r, l, s, p[ 9]);
  102         BF_ENC(l, r, s, p[10]);
  103         BF_ENC(r, l, s, p[11]);
  104         BF_ENC(l, r, s, p[12]);
  105         BF_ENC(r, l, s, p[13]);
  106         BF_ENC(l, r, s, p[14]);
  107         BF_ENC(r, l, s, p[15]);
  108         BF_ENC(l, r, s, p[16]);
  109 #if BF_ROUNDS == 20
  110         BF_ENC(r, l, s, p[17]);
  111         BF_ENC(l, r, s, p[18]);
  112         BF_ENC(r, l, s, p[19]);
  113         BF_ENC(l, r, s, p[20]);
  114 #endif
  115         r ^= p[BF_ROUNDS + 1];
  116 
  117         data[1] = l & 0xffffffff;
  118         data[0] = r & 0xffffffff;
  119 }
  120 
  121 /* XXX "data" is host endian */
  122 void
  123 BF_decrypt(data, key)
  124         BF_LONG *data;
  125         BF_KEY *key;
  126 {
  127         register BF_LONG l, r, *p, *s;
  128 
  129         p = key->P;
  130         s= &key->S[0];
  131         l = data[0];
  132         r = data[1];
  133 
  134         l ^= p[BF_ROUNDS + 1];
  135 #if BF_ROUNDS == 20
  136         BF_ENC(r, l, s, p[20]);
  137         BF_ENC(l, r, s, p[19]);
  138         BF_ENC(r, l, s, p[18]);
  139         BF_ENC(l, r, s, p[17]);
  140 #endif
  141         BF_ENC(r, l, s, p[16]);
  142         BF_ENC(l, r, s, p[15]);
  143         BF_ENC(r, l, s, p[14]);
  144         BF_ENC(l, r, s, p[13]);
  145         BF_ENC(r, l, s, p[12]);
  146         BF_ENC(l, r, s, p[11]);
  147         BF_ENC(r, l, s, p[10]);
  148         BF_ENC(l, r, s, p[ 9]);
  149         BF_ENC(r, l, s, p[ 8]);
  150         BF_ENC(l, r, s, p[ 7]);
  151         BF_ENC(r, l, s, p[ 6]);
  152         BF_ENC(l, r, s, p[ 5]);
  153         BF_ENC(r, l, s, p[ 4]);
  154         BF_ENC(l, r, s, p[ 3]);
  155         BF_ENC(r, l, s, p[ 2]);
  156         BF_ENC(l, r, s, p[ 1]);
  157         r ^= p[0];
  158 
  159         data[1] = l & 0xffffffff;
  160         data[0] = r & 0xffffffff;
  161 }

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