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1 | /* -*-c-*- |
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2 | * |
3 | * The Blowfish block cipher |
4 | * |
5 | * (c) 1998 Straylight/Edgeware |
6 | */ |
7 | |
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8 | /*----- Licensing notice --------------------------------------------------* |
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9 | * |
10 | * This file is part of Catacomb. |
11 | * |
12 | * Catacomb is free software; you can redistribute it and/or modify |
13 | * it under the terms of the GNU Library General Public License as |
14 | * published by the Free Software Foundation; either version 2 of the |
15 | * License, or (at your option) any later version. |
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16 | * |
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17 | * Catacomb is distributed in the hope that it will be useful, |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
20 | * GNU Library General Public License for more details. |
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21 | * |
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22 | * You should have received a copy of the GNU Library General Public |
23 | * License along with Catacomb; if not, write to the Free |
24 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
25 | * MA 02111-1307, USA. |
26 | */ |
27 | |
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28 | /*----- Notes on the Blowfish block cipher --------------------------------* |
29 | * |
30 | * Blowfish was invented by Bruce Schneier. The algorithm is unpatented and |
31 | * free for anyone to use. It's fast, simple, offers a big key, and is |
32 | * looking relatively bulletproof. It's also this author's block cipher of |
33 | * choice, for what little that's worth. The disadvantage is that Blowfish |
34 | * has a particularly heavyweight key schedule. |
35 | */ |
36 | |
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37 | #ifndef CATACOMB_BLOWFISH_H |
38 | #define CATACOMB_BLOWFISH_H |
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39 | |
40 | #ifdef __cplusplus |
41 | extern "C" { |
42 | #endif |
43 | |
44 | /*----- Header files ------------------------------------------------------*/ |
45 | |
46 | #include <stddef.h> |
47 | |
48 | #include <mLib/bits.h> |
49 | |
50 | /*----- Magical numbers ---------------------------------------------------*/ |
51 | |
52 | #define BLOWFISH_BLKSZ 8 |
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53 | #define BLOWFISH_KEYSZ 32 |
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54 | #define BLOWFISH_CLASS (N, B, 64) |
55 | |
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56 | extern const octet blowfish_keysz[]; |
57 | |
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58 | /*----- Data structures ---------------------------------------------------*/ |
59 | |
60 | typedef struct blowfish_ctx { |
61 | uint32 p[18]; |
62 | uint32 s0[256], s1[256], s2[256], s3[256]; |
63 | } blowfish_ctx; |
64 | |
65 | /*----- Functions provided ------------------------------------------------*/ |
66 | |
67 | /* --- @blowfish_init@ --- * |
68 | * |
69 | * Arguments: @blowfish_ctx *k@ = pointer to key block to fill in |
70 | * @const void *buf@ = pointer to buffer of key material |
71 | * @size_t sz@ = size of key material |
72 | * |
73 | * Returns: --- |
74 | * |
75 | * Use: Initializes a Blowfish key buffer. Blowfish accepts |
76 | * a more-or-less arbitrary size key. |
77 | */ |
78 | |
79 | extern void blowfish_init(blowfish_ctx */*k*/, |
80 | const void */*buf*/, size_t /*sz*/); |
81 | |
82 | /* --- @blowfish_eblk@, @blowfish_dblk@ --- * |
83 | * |
84 | * Arguments: @const blowfish_ctx *k@ = pointer to key block |
85 | * @const uint32 s[2]@ = pointer to source block |
86 | * @uint32 d[2]@ = pointer to destination block |
87 | * |
88 | * Returns: --- |
89 | * |
90 | * Use: Low-level block encryption and decryption. |
91 | */ |
92 | |
93 | extern void blowfish_eblk(const blowfish_ctx */*k*/, |
94 | const uint32 */*s*/, uint32 */*d*/); |
95 | |
96 | extern void blowfish_dblk(const blowfish_ctx */*k*/, |
97 | const uint32 */*s*/, uint32 */*d*/); |
98 | |
99 | /*----- That's all, folks -------------------------------------------------*/ |
100 | |
101 | #ifdef __cplusplus |
102 | } |
103 | #endif |
104 | |
105 | #endif |