sys/crypto/blowfish/bf_enc.c

   1 /*      $FreeBSD: src/sys/crypto/blowfish/bf_enc.c,v 1.6 2003/06/10 21:38:38 obrien Exp $       */
   2 /*      $KAME: bf_enc.c,v 1.7 2002/02/27 01:33:59 itojun Exp $  */
   3
   4 /* crypto/bf/bf_enc.c */
   5
   6 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   7  * All rights reserved.
   8  *
   9  * This package is an SSL implementation written
  10  * by Eric Young (eay@cryptsoft.com).
  11  * The implementation was written so as to conform with Netscapes SSL.
  12  *
  13  * This library is free for commercial and non-commercial use as long as
  14  * the following conditions are aheared to.  The following conditions
  15  * apply to all code found in this distribution, be it the RC4, RSA,
  16  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  17  * included with this distribution is covered by the same copyright terms
  18  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  19  *
  20  * Copyright remains Eric Young's, and as such any Copyright notices in
  21  * the code are not to be removed.
  22  * If this package is used in a product, Eric Young should be given attribution
  23  * as the author of the parts of the library used.
  24  * This can be in the form of a textual message at program startup or
  25  * in documentation (online or textual) provided with the package.
  26  *
  27  * Redistribution and use in source and binary forms, with or without
  28  * modification, are permitted provided that the following conditions
  29  * are met:
  30  * 1. Redistributions of source code must retain the copyright
  31  *    notice, this list of conditions and the following disclaimer.
  32  * 2. Redistributions in binary form must reproduce the above copyright
  33  *    notice, this list of conditions and the following disclaimer in the
  34  *    documentation and/or other materials provided with the distribution.
  35  * 3. All advertising materials mentioning features or use of this software
  36  *    must display the following acknowledgement:
  37  *    "This product includes cryptographic software written by
  38  *     Eric Young (eay@cryptsoft.com)"
  39  *    The word 'cryptographic' can be left out if the rouines from the library
  40  *    being used are not cryptographic related :-).
  41  * 4. If you include any Windows specific code (or a derivative thereof) from
  42  *    the apps directory (application code) you must include an acknowledgement:
  43  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55  * SUCH DAMAGE.
  56  *
  57  * The licence and distribution terms for any publically available version or
  58  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  59  * copied and put under another distribution licence
  60  * [including the GNU Public Licence.]
  61  */
  62
  63 #include <sys/types.h>
  64 #include <crypto/blowfish/blowfish.h>
  65 #include <crypto/blowfish/bf_locl.h>
  66
  67 /* Blowfish as implemented from 'Blowfish: Springer-Verlag paper'
  68  * (From LECTURE NOTES IN COIMPUTER SCIENCE 809, FAST SOFTWARE ENCRYPTION,
  69  * CAMBRIDGE SECURITY WORKSHOP, CAMBRIDGE, U.K., DECEMBER 9-11, 1993)
  70  */
  71
  72 #if (BF_ROUNDS != 16) && (BF_ROUNDS != 20)
  73 If you set BF_ROUNDS to some value other than 16 or 20, you will have
  74 to modify the code.
  75 #endif
  76
  77 /* XXX "data" is host endian */
  78 void
  79 BF_encrypt(BF_LONG *data, BF_KEY *key)
  80 {
  81         BF_LONG l, r, *p, *s;
  82
  83         p = key->P;
  84         s= &key->S[0];
  85         l = data[0];
  86         r = data[1];
  87
  88         l^=p[0];
  89         BF_ENC(r, l, s, p[ 1]);
  90         BF_ENC(l, r, s, p[ 2]);
  91         BF_ENC(r, l, s, p[ 3]);
  92         BF_ENC(l, r, s, p[ 4]);
  93         BF_ENC(r, l, s, p[ 5]);
  94         BF_ENC(l, r, s, p[ 6]);
  95         BF_ENC(r, l, s, p[ 7]);
  96         BF_ENC(l, r, s, p[ 8]);
  97         BF_ENC(r, l, s, p[ 9]);
  98         BF_ENC(l, r, s, p[10]);
  99         BF_ENC(r, l, s, p[11]);
 100         BF_ENC(l, r, s, p[12]);
 101         BF_ENC(r, l, s, p[13]);
 102         BF_ENC(l, r, s, p[14]);
 103         BF_ENC(r, l, s, p[15]);
 104         BF_ENC(l, r, s, p[16]);
 105 #if BF_ROUNDS == 20
 106         BF_ENC(r, l, s, p[17]);
 107         BF_ENC(l, r, s, p[18]);
 108         BF_ENC(r, l, s, p[19]);
 109         BF_ENC(l, r, s, p[20]);
 110 #endif
 111         r ^= p[BF_ROUNDS + 1];
 112
 113         data[1] = l & 0xffffffff;
 114         data[0] = r & 0xffffffff;
 115 }
 116
 117 /* XXX "data" is host endian */
 118 void
 119 BF_decrypt(BF_LONG *data, BF_KEY *key)
 120 {
 121         BF_LONG l, r, *p, *s;
 122
 123         p = key->P;
 124         s= &key->S[0];
 125         l = data[0];
 126         r = data[1];
 127
 128         l ^= p[BF_ROUNDS + 1];
 129 #if BF_ROUNDS == 20
 130         BF_ENC(r, l, s, p[20]);
 131         BF_ENC(l, r, s, p[19]);
 132         BF_ENC(r, l, s, p[18]);
 133         BF_ENC(l, r, s, p[17]);
 134 #endif
 135         BF_ENC(r, l, s, p[16]);
 136         BF_ENC(l, r, s, p[15]);
 137         BF_ENC(r, l, s, p[14]);
 138         BF_ENC(l, r, s, p[13]);
 139         BF_ENC(r, l, s, p[12]);
 140         BF_ENC(l, r, s, p[11]);
 141         BF_ENC(r, l, s, p[10]);
 142         BF_ENC(l, r, s, p[ 9]);
 143         BF_ENC(r, l, s, p[ 8]);
 144         BF_ENC(l, r, s, p[ 7]);
 145         BF_ENC(r, l, s, p[ 6]);
 146         BF_ENC(l, r, s, p[ 5]);
 147         BF_ENC(r, l, s, p[ 4]);
 148         BF_ENC(l, r, s, p[ 3]);
 149         BF_ENC(r, l, s, p[ 2]);
 150         BF_ENC(l, r, s, p[ 1]);
 151         r ^= p[0];
 152
 153         data[1] = l & 0xffffffff;
 154         data[0] = r & 0xffffffff;
 155 }