bf_enc.c revision 63249 
1/*	$FreeBSD: head/sys/crypto/blowfish/bf_enc.c 62587 2000-07-04 16:35:15Z itojun $	*/
2/*	$KAME: bf_enc.c,v 1.3 2000/03/27 04:36:26 sumikawa Exp $	*/
3
4/* crypto/bf/bf_enc.c */
5/* Copyright (C) 1995-1997 Eric Young (eay@mincom.oz.au)
6 * All rights reserved.
7 *
8 * This package is an SSL implementation written
9 * by Eric Young (eay@mincom.oz.au).
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@mincom.oz.au).
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@mincom.oz.au)"
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@mincom.oz.au)"
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 <crypto/blowfish/blowfish.h>
63#include <crypto/blowfish/bf_locl.h>
64
65/* Blowfish as implemented from 'Blowfish: Springer-Verlag paper'
66 * (From LECTURE NOTES IN COIMPUTER SCIENCE 809, FAST SOFTWARE ENCRYPTION,
67 * CAMBRIDGE SECURITY WORKSHOP, CAMBRIDGE, U.K., DECEMBER 9-11, 1993)
68 */
69
70#if (BF_ROUNDS != 16) && (BF_ROUNDS != 20)
71If you set BF_ROUNDS to some value other than 16 or 20, you will have
72to modify the code.
73#endif
74
75void BF_encrypt(data,key,encrypt)
76BF_LONG *data;
77BF_KEY *key;
78int encrypt;
79	{
80	register BF_LONG l,r,*p,*s;
81
82	p=key->P;
83	s= &(key->S[0]);
84	l=data[0];
85	r=data[1];
86
87	if (encrypt)
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	else
115		{
116		l^=p[BF_ROUNDS+1];
117#if BF_ROUNDS == 20
118		BF_ENC(r,l,s,p[20]);
119		BF_ENC(l,r,s,p[19]);
120		BF_ENC(r,l,s,p[18]);
121		BF_ENC(l,r,s,p[17]);
122#endif
123		BF_ENC(r,l,s,p[16]);
124		BF_ENC(l,r,s,p[15]);
125		BF_ENC(r,l,s,p[14]);
126		BF_ENC(l,r,s,p[13]);
127		BF_ENC(r,l,s,p[12]);
128		BF_ENC(l,r,s,p[11]);
129		BF_ENC(r,l,s,p[10]);
130		BF_ENC(l,r,s,p[ 9]);
131		BF_ENC(r,l,s,p[ 8]);
132		BF_ENC(l,r,s,p[ 7]);
133		BF_ENC(r,l,s,p[ 6]);
134		BF_ENC(l,r,s,p[ 5]);
135		BF_ENC(r,l,s,p[ 4]);
136		BF_ENC(l,r,s,p[ 3]);
137		BF_ENC(r,l,s,p[ 2]);
138		BF_ENC(l,r,s,p[ 1]);
139		r^=p[0];
140		}
141	data[1]=l&0xffffffff;
142	data[0]=r&0xffffffff;
143	}
144