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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: mars.h,v 1.2 2004/04/08 01:36:15 mdw Exp $ |
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4 | * |
5 | * The MARS block cipher |
6 | * |
7 | * (c) 2001 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 | |
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30 | /*----- Notes on the MARS block cipher ------------------------------------* |
31 | * |
32 | * MARS was IBM's submission to the AES contest. It was designed by a number |
33 | * of clever people at the T. J. Watson labs, and made it to the second round |
34 | * of the contest. Unfortunately, MARS is rather messy. There are some |
35 | * awkward corner cases in the key schedule algorithm, for example, that show |
36 | * up very rarely. |
37 | */ |
38 | |
39 | #ifndef CATACOMB_MARS_H |
40 | #define CATACOMB_MARS_H |
41 | |
42 | #ifdef __cplusplus |
43 | extern "C" { |
44 | #endif |
45 | |
46 | /*----- Header files ------------------------------------------------------*/ |
47 | |
48 | #include <stddef.h> |
49 | |
50 | #include <mLib/bits.h> |
51 | |
52 | /*----- Magical numbers ---------------------------------------------------*/ |
53 | |
54 | #define MARS_BLKSZ 16 |
55 | #define MARS_KEYSZ 32 |
56 | #define MARS_CLASS (N, L, 128) |
57 | |
58 | extern const octet mars_keysz[]; |
59 | |
60 | /*----- Data structures ---------------------------------------------------*/ |
61 | |
62 | typedef struct mars_ctx { |
63 | uint32 k[40]; |
64 | } mars_ctx; |
65 | |
66 | /*----- Functions provided ------------------------------------------------*/ |
67 | |
68 | /* --- @mars_init@ --- * |
69 | * |
70 | * Arguments: @mars_ctx *k@ = pointer to key block to fill in |
71 | * @const void *buf@ = pointer to buffer of key material |
72 | * @size_t sz@ = size of key material |
73 | * |
74 | * Returns: --- |
75 | * |
76 | * Use: Initializes a MARS key buffer. MARS accepts key sizes |
77 | * between 128 and 448 bits which are a multiple of 32 bits. |
78 | */ |
79 | |
80 | extern void mars_init(mars_ctx */*k*/, |
81 | const void */*buf*/, size_t /*sz*/); |
82 | |
83 | /* --- @mars_eblk@, @mars_dblk@ --- * |
84 | * |
85 | * Arguments: @const mars_ctx *k@ = pointer to key block |
86 | * @const uint32 s[4]@ = pointer to source block |
87 | * @uint32 d[4]@ = pointer to destination block |
88 | * |
89 | * Returns: --- |
90 | * |
91 | * Use: Low-level block encryption and decryption. |
92 | */ |
93 | |
94 | extern void mars_eblk(const mars_ctx */*k*/, |
95 | const uint32 */*s*/, uint32 */*d*/); |
96 | |
97 | extern void mars_dblk(const mars_ctx */*k*/, |
98 | const uint32 */*s*/, uint32 */*d*/); |
99 | |
100 | /*----- That's all, folks -------------------------------------------------*/ |
101 | |
102 | #ifdef __cplusplus |
103 | } |
104 | #endif |
105 | |
106 | #endif |