1 /* $KAME: bf_enc.c,v 1.7 2002/02/27 01:33:59 itojun Exp $ */
2
3 /* crypto/bf/bf_enc.c */
4
5 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
6 * All rights reserved.
7 *
8 * This package is an SSL implementation written
9 * by Eric Young (eay@cryptsoft.com).
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@cryptsoft.com).
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@cryptsoft.com)"
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@cryptsoft.com)"
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 <sys/cdefs.h>
63 __FBSDID("$FreeBSD$");
64
65 #include <sys/types.h>
66 #include <crypto/blowfish/blowfish.h>
67 #include <crypto/blowfish/bf_locl.h>
68
69 /* Blowfish as implemented from 'Blowfish: Springer-Verlag paper'
70 * (From LECTURE NOTES IN COIMPUTER SCIENCE 809, FAST SOFTWARE ENCRYPTION,
71 * CAMBRIDGE SECURITY WORKSHOP, CAMBRIDGE, U.K., DECEMBER 9-11, 1993)
72 */
73
74 #if (BF_ROUNDS != 16) && (BF_ROUNDS != 20)
75 If you set BF_ROUNDS to some value other than 16 or 20, you will have
76 to modify the code.
77 #endif
78
79 /* XXX "data" is host endian */
80 void
BF_encrypt(data,key)81 BF_encrypt(data, key)
82 BF_LONG *data;
83 BF_KEY *key;
84 {
85 register BF_LONG l, r, *p, *s;
86
87 p = key->P;
88 s= &key->S[0];
89 l = data[0];
90 r = data[1];
91
92 l^=p[0];
93 BF_ENC(r, l, s, p[ 1]);
94 BF_ENC(l, r, s, p[ 2]);
95 BF_ENC(r, l, s, p[ 3]);
96 BF_ENC(l, r, s, p[ 4]);
97 BF_ENC(r, l, s, p[ 5]);
98 BF_ENC(l, r, s, p[ 6]);
99 BF_ENC(r, l, s, p[ 7]);
100 BF_ENC(l, r, s, p[ 8]);
101 BF_ENC(r, l, s, p[ 9]);
102 BF_ENC(l, r, s, p[10]);
103 BF_ENC(r, l, s, p[11]);
104 BF_ENC(l, r, s, p[12]);
105 BF_ENC(r, l, s, p[13]);
106 BF_ENC(l, r, s, p[14]);
107 BF_ENC(r, l, s, p[15]);
108 BF_ENC(l, r, s, p[16]);
109 #if BF_ROUNDS == 20
110 BF_ENC(r, l, s, p[17]);
111 BF_ENC(l, r, s, p[18]);
112 BF_ENC(r, l, s, p[19]);
113 BF_ENC(l, r, s, p[20]);
114 #endif
115 r ^= p[BF_ROUNDS + 1];
116
117 data[1] = l & 0xffffffff;
118 data[0] = r & 0xffffffff;
119 }
120
121 /* XXX "data" is host endian */
122 void
BF_decrypt(data,key)123 BF_decrypt(data, key)
124 BF_LONG *data;
125 BF_KEY *key;
126 {
127 register BF_LONG l, r, *p, *s;
128
129 p = key->P;
130 s= &key->S[0];
131 l = data[0];
132 r = data[1];
133
134 l ^= p[BF_ROUNDS + 1];
135 #if BF_ROUNDS == 20
136 BF_ENC(r, l, s, p[20]);
137 BF_ENC(l, r, s, p[19]);
138 BF_ENC(r, l, s, p[18]);
139 BF_ENC(l, r, s, p[17]);
140 #endif
141 BF_ENC(r, l, s, p[16]);
142 BF_ENC(l, r, s, p[15]);
143 BF_ENC(r, l, s, p[14]);
144 BF_ENC(l, r, s, p[13]);
145 BF_ENC(r, l, s, p[12]);
146 BF_ENC(l, r, s, p[11]);
147 BF_ENC(r, l, s, p[10]);
148 BF_ENC(l, r, s, p[ 9]);
149 BF_ENC(r, l, s, p[ 8]);
150 BF_ENC(l, r, s, p[ 7]);
151 BF_ENC(r, l, s, p[ 6]);
152 BF_ENC(l, r, s, p[ 5]);
153 BF_ENC(r, l, s, p[ 4]);
154 BF_ENC(l, r, s, p[ 3]);
155 BF_ENC(r, l, s, p[ 2]);
156 BF_ENC(l, r, s, p[ 1]);
157 r ^= p[0];
158
159 data[1] = l & 0xffffffff;
160 data[0] = r & 0xffffffff;
161 }
162