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)
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
BF_decrypt(BF_LONG * data,const BF_KEY * key)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 }
159