1/*	$NetBSD: bf_enc.c,v 1.11 2024/02/05 21:46:06 andvar 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 1.11 2024/02/05 21:46:06 andvar 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 COMPUTER 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)
74If you set BF_ROUNDS to some value other than 16 or 20, you will have
75to modify the code.
76#endif
77
78/* XXX "data" is host endian */
79void
80BF_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 */
120void
121BF_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}
159