sys/crypto/blowfish/bf_enc.c

   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("$FreeBSD$");
  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 }