1 | /* $NetBSD: bf_enc.c,v 1.10 2005/12/11 12:20:48 christos 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 1.10 2005/12/11 12:20:48 christos 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 COIMPUTER 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 |
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 | |