sys/crypto/blowfish/bf_enc.c

   1 /*      $NetBSD: bf_enc.c,v 1.6.16.3 2004/09/21 13:26:15 skrll Exp $    */
   2
   3 /* crypto/bf/bf_enc.c */
   4 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   5  * All rights reserved.
   6  *
   7  * This package is an SSL implementation written
   8  * by Eric Young (eay@cryptsoft.com).
   9  * The implementation was written so as to conform with Netscapes SSL.
  10  *
  11  * This library is free for commercial and non-commercial use as long as
  12  * the following conditions are aheared to.  The following conditions
  13  * apply to all code found in this distribution, be it the RC4, RSA,
  14  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  15  * included with this distribution is covered by the same copyright terms
  16  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  17  *
  18  * Copyright remains Eric Young's, and as such any Copyright notices in
  19  * the code are not to be removed.
  20  * If this package is used in a product, Eric Young should be given attribution
  21  * as the author of the parts of the library used.
  22  * This can be in the form of a textual message at program startup or
  23  * in documentation (online or textual) provided with the package.
  24  *
  25  * Redistribution and use in source and binary forms, with or without
  26  * modification, are permitted provided that the following conditions
  27  * are met:
  28  * 1. Redistributions of source code must retain the copyright
  29  *    notice, this list of conditions and the following disclaimer.
  30  * 2. Redistributions in binary form must reproduce the above copyright
  31  *    notice, this list of conditions and the following disclaimer in the
  32  *    documentation and/or other materials provided with the distribution.
  33  * 3. All advertising materials mentioning features or use of this software
  34  *    must display the following acknowledgement:
  35  *    "This product includes cryptographic software written by
  36  *     Eric Young (eay@cryptsoft.com)"
  37  *    The word 'cryptographic' can be left out if the rouines from the library
  38  *    being used are not cryptographic related :-).
  39  * 4. If you include any Windows specific code (or a derivative thereof) from
  40  *    the apps directory (application code) you must include an acknowledgement:
  41  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  42  *
  43  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  44  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  45  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  46  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  47  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  48  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  49  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  50  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  51  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  52  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  53  * SUCH DAMAGE.
  54  *
  55  * The licence and distribution terms for any publically available version or
  56  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  57  * copied and put under another distribution licence
  58  * [including the GNU Public Licence.]
  59  */
  60
  61 #include <sys/cdefs.h>
  62 __KERNEL_RCSID(0, "$NetBSD: bf_enc.c,v 1.6.16.3 2004/09/21 13:26:15 skrll Exp $");
  63
  64 #include <sys/types.h>
  65 #include <crypto/blowfish/blowfish.h>
  66 #include <crypto/blowfish/bf_locl.h>
  67
  68 /* Blowfish as implemented from 'Blowfish: Springer-Verlag paper'
  69  * (From LECTURE NOTES IN COIMPUTER SCIENCE 809, FAST SOFTWARE ENCRYPTION,
  70  * CAMBRIDGE SECURITY WORKSHOP, CAMBRIDGE, U.K., DECEMBER 9-11, 1993)
  71  */
  72
  73 #if (BF_ROUNDS != 16) && (BF_ROUNDS != 20)
  74 If you set BF_ROUNDS to some value other than 16 or 20, you will have
  75 to modify the code.
  76 #endif
  77
  78 /* XXX "data" is host endian */
  79 void
  80 BF_encrypt(BF_LONG *data, const BF_KEY *key)
  81 {
  82         BF_LONG l, r;
  83         const BF_LONG *p, *s;
  84
  85         p = key->P;
  86         s= &key->S[0];
  87         l = data[0];
  88         r = data[1];
  89
  90         l^=p[0];
  91         BF_ENC(r, l, s, p[ 1]);
  92         BF_ENC(l, r, s, p[ 2]);
  93         BF_ENC(r, l, s, p[ 3]);
  94         BF_ENC(l, r, s, p[ 4]);
  95         BF_ENC(r, l, s, p[ 5]);
  96         BF_ENC(l, r, s, p[ 6]);
  97         BF_ENC(r, l, s, p[ 7]);
  98         BF_ENC(l, r, s, p[ 8]);
  99         BF_ENC(r, l, s, p[ 9]);
 100         BF_ENC(l, r, s, p[10]);
 101         BF_ENC(r, l, s, p[11]);
 102         BF_ENC(l, r, s, p[12]);
 103         BF_ENC(r, l, s, p[13]);
 104         BF_ENC(l, r, s, p[14]);
 105         BF_ENC(r, l, s, p[15]);
 106         BF_ENC(l, r, s, p[16]);
 107 #if BF_ROUNDS == 20
 108         BF_ENC(r, l, s, p[17]);
 109         BF_ENC(l, r, s, p[18]);
 110         BF_ENC(r, l, s, p[19]);
 111         BF_ENC(l, r, s, p[20]);
 112 #endif
 113         r ^= p[BF_ROUNDS + 1];
 114
 115         data[1] = l & 0xffffffff;
 116         data[0] = r & 0xffffffff;
 117 }
 118
 119 /* XXX "data" is host endian */
 120 void
 121 BF_decrypt(BF_LONG *data, const BF_KEY *key)
 122 {
 123         BF_LONG l, r;
 124         const BF_LONG *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 }