bf_enc.c revision 1.7 
1/* crypto/bf/bf_enc.c */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to.  The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 *    notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 *    notice, this list of conditions and the following disclaimer in the
30 *    documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 *    must display the following acknowledgement:
33 *    "This product includes cryptographic software written by
34 *     Eric Young (eay@cryptsoft.com)"
35 *    The word 'cryptographic' can be left out if the rouines from the library
36 *    being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 *    the apps directory (application code) you must include an acknowledgement:
39 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed.  i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59#include <sys/cdefs.h>
60__KERNEL_RCSID(0, "$NetBSD: bf_enc.c,v 1.7 2003/08/26 23:51:13 thorpej Exp $");
61
62#include <sys/types.h>
63#include <crypto/blowfish/blowfish.h>
64#include <crypto/blowfish/bf_locl.h>
65
66/* Blowfish as implemented from 'Blowfish: Springer-Verlag paper'
67 * (From LECTURE NOTES IN COIMPUTER SCIENCE 809, FAST SOFTWARE ENCRYPTION,
68 * CAMBRIDGE SECURITY WORKSHOP, CAMBRIDGE, U.K., DECEMBER 9-11, 1993)
69 */
70
71#if (BF_ROUNDS != 16) && (BF_ROUNDS != 20)
72If you set BF_ROUNDS to some value other than 16 or 20, you will have
73to modify the code.
74#endif
75
76/* XXX "data" is host endian */
77void
78BF_encrypt(BF_LONG *data, const BF_KEY *key)
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	l^=p[0];
88	BF_ENC(r, l, s, p[ 1]);
89	BF_ENC(l, r, s, p[ 2]);
90	BF_ENC(r, l, s, p[ 3]);
91	BF_ENC(l, r, s, p[ 4]);
92	BF_ENC(r, l, s, p[ 5]);
93	BF_ENC(l, r, s, p[ 6]);
94	BF_ENC(r, l, s, p[ 7]);
95	BF_ENC(l, r, s, p[ 8]);
96	BF_ENC(r, l, s, p[ 9]);
97	BF_ENC(l, r, s, p[10]);
98	BF_ENC(r, l, s, p[11]);
99	BF_ENC(l, r, s, p[12]);
100	BF_ENC(r, l, s, p[13]);
101	BF_ENC(l, r, s, p[14]);
102	BF_ENC(r, l, s, p[15]);
103	BF_ENC(l, r, s, p[16]);
104#if BF_ROUNDS == 20
105	BF_ENC(r, l, s, p[17]);
106	BF_ENC(l, r, s, p[18]);
107	BF_ENC(r, l, s, p[19]);
108	BF_ENC(l, r, s, p[20]);
109#endif
110	r ^= p[BF_ROUNDS + 1];
111
112	data[1] = l & 0xffffffff;
113	data[0] = r & 0xffffffff;
114}
115
116/* XXX "data" is host endian */
117void
118BF_decrypt(BF_LONG *data, const BF_KEY *key)
119{
120	register BF_LONG l, r, *p, *s;
121
122	p = key->P;
123	s= &key->S[0];
124	l = data[0];
125	r = data[1];
126
127	l ^= p[BF_ROUNDS + 1];
128#if BF_ROUNDS == 20
129	BF_ENC(r, l, s, p[20]);
130	BF_ENC(l, r, s, p[19]);
131	BF_ENC(r, l, s, p[18]);
132	BF_ENC(l, r, s, p[17]);
133#endif
134	BF_ENC(r, l, s, p[16]);
135	BF_ENC(l, r, s, p[15]);
136	BF_ENC(r, l, s, p[14]);
137	BF_ENC(l, r, s, p[13]);
138	BF_ENC(r, l, s, p[12]);
139	BF_ENC(l, r, s, p[11]);
140	BF_ENC(r, l, s, p[10]);
141	BF_ENC(l, r, s, p[ 9]);
142	BF_ENC(r, l, s, p[ 8]);
143	BF_ENC(l, r, s, p[ 7]);
144	BF_ENC(r, l, s, p[ 6]);
145	BF_ENC(l, r, s, p[ 5]);
146	BF_ENC(r, l, s, p[ 4]);
147	BF_ENC(l, r, s, p[ 3]);
148	BF_ENC(r, l, s, p[ 2]);
149	BF_ENC(l, r, s, p[ 1]);
150	r ^= p[0];
151
152	data[1] = l & 0xffffffff;
153	data[0] = r & 0xffffffff;
154}
155