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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: blowfish.h,v 1.4 1997/09/26 09:14:57 mdw Exp $ |
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4 | * |
5 | * Blowfish encryption routines |
6 | * |
7 | * (c) 1997 Mark Wooding |
8 | */ |
9 | |
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10 | /*----- Licensing notice --------------------------------------------------* |
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11 | * |
12 | * This file is part of `become' |
13 | * |
14 | * `Become' is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU General Public License as published by |
16 | * the Free Software Foundation; either version 2 of the License, or |
17 | * (at your option) any later version. |
18 | * |
19 | * `Become' is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU General Public License |
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25 | * along with `become'; if not, write to the Free Software Foundation, |
26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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27 | */ |
28 | |
29 | /*----- Revision history --------------------------------------------------* |
30 | * |
31 | * $Log: blowfish.h,v $ |
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32 | * Revision 1.4 1997/09/26 09:14:57 mdw |
33 | * Merged blowfish branch into trunk. |
34 | * |
35 | * Revision 1.3.2.1 1997/09/26 09:07:59 mdw |
36 | * Use the Blowfish encryption algorithm instead of IDEA. This is partly |
37 | * because I prefer Blowfish (without any particularly strong evidence) but |
38 | * mainly because IDEA is patented and Blowfish isn't. |
39 | * |
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40 | * Revision 1.3 1997/08/07 09:43:20 mdw |
41 | * Fix address of the FSF. |
42 | * |
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43 | * Revision 1.2 1997/08/04 10:24:20 mdw |
44 | * Sources placed under CVS control. |
45 | * |
46 | * Revision 1.1 1997/07/21 13:47:53 mdw |
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47 | * Initial revision |
48 | * |
49 | */ |
50 | |
51 | #ifndef BLOWFISH_H |
52 | #define BLOWFISH_H |
53 | |
54 | #ifdef __cplusplus |
55 | extern "C" { |
56 | #endif |
57 | |
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58 | /*----- Required headers --------------------------------------------------*/ |
59 | |
60 | #ifndef CONFIG_H |
61 | # include "config.h" |
62 | #endif |
63 | |
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64 | /*----- Type definitions --------------------------------------------------*/ |
65 | |
66 | /* --- A blowfish expanded key --- */ |
67 | |
68 | typedef struct blowfish_key { |
69 | uint_32 p[18]; |
70 | uint_32 s0[256]; |
71 | uint_32 s1[256]; |
72 | uint_32 s2[256]; |
73 | uint_32 s3[256]; |
74 | } blowfish_key; |
75 | |
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76 | /* --- Size of a blowfish block --- */ |
77 | |
78 | #define BLOWFISH_BLKSIZE (8u) |
79 | |
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80 | /*----- Functions provided ------------------------------------------------*/ |
81 | |
82 | /* --- @blowfish_encrypt@ --- * |
83 | * |
84 | * Arguments: @const blowfish_key *k@ = pointer to key block |
85 | * @const voic *from@ = block to encrypt from |
86 | * @void *to@ = block to encrypt to |
87 | * |
88 | * Returns: --- |
89 | * |
90 | * Use: Encrypts a block using the Blowfish algorithm. |
91 | */ |
92 | |
93 | extern void blowfish_encrypt(const blowfish_key */*k*/, |
94 | const void */*from*/, void */*to*/); |
95 | |
96 | |
97 | /* --- @blowfish_decrypt@ --- * |
98 | * |
99 | * Arguments: @const blowfish_key *k@ = pointer to key block |
100 | * @const void *from@ = block to decrypt from |
101 | * @void *to@ = block to decrypt to |
102 | * |
103 | * Returns: --- |
104 | * |
105 | * Use: Decrypts a block using the Blowfish algorithm. |
106 | */ |
107 | |
108 | extern void blowfish_decrypt(const blowfish_key */*k*/, |
109 | const void */*from*/, void */*to*/); |
110 | |
111 | /* --- @blowfish_setKey@ --- * |
112 | * |
113 | * Arguments: @blowfish_key *kb@ = pointer to key block to fill |
114 | * @void *k@ = pointer to key data |
115 | * @size_t sz@ = length of data in bytes |
116 | * |
117 | * Returns: --- |
118 | * |
119 | * Use: Expands a key which isn't represented as a number of whole |
120 | * words. This is a nonstandard extension, although it can be |
121 | * used to support 40-bit keys, which some governments might |
122 | * find more palatable than 160-bit (or 448-bit!) keys. |
123 | */ |
124 | |
125 | extern void blowfish_setKey(blowfish_key */*kb*/, |
126 | const void */*k*/, size_t /*sz*/); |
127 | |
128 | /*----- That's all, folks -------------------------------------------------*/ |
129 | |
130 | #ifdef __cplusplus |
131 | } |
132 | #endif |
133 | |
134 | #endif |