1 /* $FreeBSD: src/sys/crypto/blowfish/bf_enc.c,v 1.6 2003/06/10 21:38:38 obrien Exp $ */
2 /* $KAME: bf_enc.c,v 1.7 2002/02/27 01:33:59 itojun Exp $ */
3
4 /* crypto/bf/bf_enc.c */
5
6 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
7 * All rights reserved.
8 *
9 * This package is an SSL implementation written
10 * by Eric Young (eay@cryptsoft.com).
11 * The implementation was written so as to conform with Netscapes SSL.
12 *
13 * This library is free for commercial and non-commercial use as long as
14 * the following conditions are aheared to. The following conditions
15 * apply to all code found in this distribution, be it the RC4, RSA,
16 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
17 * included with this distribution is covered by the same copyright terms
18 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
19 *
20 * Copyright remains Eric Young's, and as such any Copyright notices in
21 * the code are not to be removed.
22 * If this package is used in a product, Eric Young should be given attribution
23 * as the author of the parts of the library used.
24 * This can be in the form of a textual message at program startup or
25 * in documentation (online or textual) provided with the package.
26 *
27 * Redistribution and use in source and binary forms, with or without
28 * modification, are permitted provided that the following conditions
29 * are met:
30 * 1. Redistributions of source code must retain the copyright
31 * notice, this list of conditions and the following disclaimer.
32 * 2. Redistributions in binary form must reproduce the above copyright
33 * notice, this list of conditions and the following disclaimer in the
34 * documentation and/or other materials provided with the distribution.
35 * 3. All advertising materials mentioning features or use of this software
36 * must display the following acknowledgement:
37 * "This product includes cryptographic software written by
38 * Eric Young (eay@cryptsoft.com)"
39 * The word 'cryptographic' can be left out if the rouines from the library
40 * being used are not cryptographic related :-).
41 * 4. If you include any Windows specific code (or a derivative thereof) from
42 * the apps directory (application code) you must include an acknowledgement:
43 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
44 *
45 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
46 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
47 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
48 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
49 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
50 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
51 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
52 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
53 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
54 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
55 * SUCH DAMAGE.
56 *
57 * The licence and distribution terms for any publically available version or
58 * derivative of this code cannot be changed. i.e. this code cannot simply be
59 * copied and put under another distribution licence
60 * [including the GNU Public Licence.]
61 */
62
63 #include <sys/types.h>
64 #include <crypto/blowfish/blowfish.h>
65 #include <crypto/blowfish/bf_locl.h>
66
67 /* Blowfish as implemented from 'Blowfish: Springer-Verlag paper'
68 * (From LECTURE NOTES IN COIMPUTER SCIENCE 809, FAST SOFTWARE ENCRYPTION,
69 * CAMBRIDGE SECURITY WORKSHOP, CAMBRIDGE, U.K., DECEMBER 9-11, 1993)
70 */
71
72 #if (BF_ROUNDS != 16) && (BF_ROUNDS != 20)
73 If you set BF_ROUNDS to some value other than 16 or 20, you will have
74 to modify the code.
75 #endif
76
77 /* XXX "data" is host endian */
78 void
79 BF_encrypt(BF_LONG *data, BF_KEY *key)
80 {
81 BF_LONG l, r, *p, *s;
82
83 p = key->P;
84 s= &key->S[0];
85 l = data[0];
86 r = data[1];
87
88 l^=p[0];
89 BF_ENC(r, l, s, p[ 1]);
90 BF_ENC(l, r, s, p[ 2]);
91 BF_ENC(r, l, s, p[ 3]);
92 BF_ENC(l, r, s, p[ 4]);
93 BF_ENC(r, l, s, p[ 5]);
94 BF_ENC(l, r, s, p[ 6]);
95 BF_ENC(r, l, s, p[ 7]);
96 BF_ENC(l, r, s, p[ 8]);
97 BF_ENC(r, l, s, p[ 9]);
98 BF_ENC(l, r, s, p[10]);
99 BF_ENC(r, l, s, p[11]);
100 BF_ENC(l, r, s, p[12]);
101 BF_ENC(r, l, s, p[13]);
102 BF_ENC(l, r, s, p[14]);
103 BF_ENC(r, l, s, p[15]);
104 BF_ENC(l, r, s, p[16]);
105 #if BF_ROUNDS == 20
106 BF_ENC(r, l, s, p[17]);
107 BF_ENC(l, r, s, p[18]);
108 BF_ENC(r, l, s, p[19]);
109 BF_ENC(l, r, s, p[20]);
110 #endif
111 r ^= p[BF_ROUNDS + 1];
112
113 data[1] = l & 0xffffffff;
114 data[0] = r & 0xffffffff;
115 }
116
117 /* XXX "data" is host endian */
118 void
BF_decrypt(BF_LONG * data,BF_KEY * key)119 BF_decrypt(BF_LONG *data, BF_KEY *key)
120 {
121 BF_LONG l, r, *p, *s;
122
123 p = key->P;
124 s= &key->S[0];
125 l = data[0];
126 r = data[1];
127
128 l ^= p[BF_ROUNDS + 1];
129 #if BF_ROUNDS == 20
130 BF_ENC(r, l, s, p[20]);
131 BF_ENC(l, r, s, p[19]);
132 BF_ENC(r, l, s, p[18]);
133 BF_ENC(l, r, s, p[17]);
134 #endif
135 BF_ENC(r, l, s, p[16]);
136 BF_ENC(l, r, s, p[15]);
137 BF_ENC(r, l, s, p[14]);
138 BF_ENC(l, r, s, p[13]);
139 BF_ENC(r, l, s, p[12]);
140 BF_ENC(l, r, s, p[11]);
141 BF_ENC(r, l, s, p[10]);
142 BF_ENC(l, r, s, p[ 9]);
143 BF_ENC(r, l, s, p[ 8]);
144 BF_ENC(l, r, s, p[ 7]);
145 BF_ENC(r, l, s, p[ 6]);
146 BF_ENC(l, r, s, p[ 5]);
147 BF_ENC(r, l, s, p[ 4]);
148 BF_ENC(l, r, s, p[ 3]);
149 BF_ENC(r, l, s, p[ 2]);
150 BF_ENC(l, r, s, p[ 1]);
151 r ^= p[0];
152
153 data[1] = l & 0xffffffff;
154 data[0] = r & 0xffffffff;
155 }
156