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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: blowfish.h,v 1.2 1999/12/10 23:29:48 mdw Exp $ |
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4 | * |
5 | * The Blowfish block cipher |
6 | * |
7 | * (c) 1998 Straylight/Edgeware |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of Catacomb. |
13 | * |
14 | * Catacomb is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU Library General Public License as |
16 | * published by the Free Software Foundation; either version 2 of the |
17 | * License, or (at your option) any later version. |
18 | * |
19 | * Catacomb 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 Library General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU Library General Public |
25 | * License along with Catacomb; if not, write to the Free |
26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
27 | * MA 02111-1307, USA. |
28 | */ |
29 | |
30 | /*----- Revision history --------------------------------------------------* |
31 | * |
32 | * $Log: blowfish.h,v $ |
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33 | * Revision 1.2 1999/12/10 23:29:48 mdw |
34 | * Change header file guard names. |
35 | * |
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36 | * Revision 1.1 1999/09/03 08:41:11 mdw |
37 | * Initial import. |
38 | * |
39 | */ |
40 | |
41 | /*----- Notes on the Blowfish block cipher --------------------------------* |
42 | * |
43 | * Blowfish was invented by Bruce Schneier. The algorithm is unpatented and |
44 | * free for anyone to use. It's fast, simple, offers a big key, and is |
45 | * looking relatively bulletproof. It's also this author's block cipher of |
46 | * choice, for what little that's worth. The disadvantage is that Blowfish |
47 | * has a particularly heavyweight key schedule. |
48 | */ |
49 | |
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50 | #ifndef CATACOMB_BLOWFISH_H |
51 | #define CATACOMB_BLOWFISH_H |
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52 | |
53 | #ifdef __cplusplus |
54 | extern "C" { |
55 | #endif |
56 | |
57 | /*----- Header files ------------------------------------------------------*/ |
58 | |
59 | #include <stddef.h> |
60 | |
61 | #include <mLib/bits.h> |
62 | |
63 | /*----- Magical numbers ---------------------------------------------------*/ |
64 | |
65 | #define BLOWFISH_BLKSZ 8 |
66 | #define BLOWFISH_KEYSZ 0 |
67 | #define BLOWFISH_CLASS (N, B, 64) |
68 | |
69 | /*----- Data structures ---------------------------------------------------*/ |
70 | |
71 | typedef struct blowfish_ctx { |
72 | uint32 p[18]; |
73 | uint32 s0[256], s1[256], s2[256], s3[256]; |
74 | } blowfish_ctx; |
75 | |
76 | /*----- Functions provided ------------------------------------------------*/ |
77 | |
78 | /* --- @blowfish_init@ --- * |
79 | * |
80 | * Arguments: @blowfish_ctx *k@ = pointer to key block to fill in |
81 | * @const void *buf@ = pointer to buffer of key material |
82 | * @size_t sz@ = size of key material |
83 | * |
84 | * Returns: --- |
85 | * |
86 | * Use: Initializes a Blowfish key buffer. Blowfish accepts |
87 | * a more-or-less arbitrary size key. |
88 | */ |
89 | |
90 | extern void blowfish_init(blowfish_ctx */*k*/, |
91 | const void */*buf*/, size_t /*sz*/); |
92 | |
93 | /* --- @blowfish_eblk@, @blowfish_dblk@ --- * |
94 | * |
95 | * Arguments: @const blowfish_ctx *k@ = pointer to key block |
96 | * @const uint32 s[2]@ = pointer to source block |
97 | * @uint32 d[2]@ = pointer to destination block |
98 | * |
99 | * Returns: --- |
100 | * |
101 | * Use: Low-level block encryption and decryption. |
102 | */ |
103 | |
104 | extern void blowfish_eblk(const blowfish_ctx */*k*/, |
105 | const uint32 */*s*/, uint32 */*d*/); |
106 | |
107 | extern void blowfish_dblk(const blowfish_ctx */*k*/, |
108 | const uint32 */*s*/, uint32 */*d*/); |
109 | |
110 | /*----- That's all, folks -------------------------------------------------*/ |
111 | |
112 | #ifdef __cplusplus |
113 | } |
114 | #endif |
115 | |
116 | #endif |