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1 | /* -*-c-*- |
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2 | * |
3 | * The Rijndael block cipher |
4 | * |
5 | * (c) 2000 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 Rijndael block cipher --------------------------------* |
29 | * |
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30 | * Invented by Joan Daemen and Vincent Rijmen, Rijndael is a fast, elegant |
31 | * and relatively simple 128-bit block cipher. It was chosen by NIST to be |
32 | * the new Advanced Encryption Standard (AES) algorithm. |
33 | * |
34 | * Rijnadel appears to have a low security margin. I recommend waiting |
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35 | * before using Rijndael for any sensitive applications. |
36 | */ |
37 | |
38 | #ifndef CATACOMB_RIJNDAEL_H |
39 | #define CATACOMB_RIJNDAEL_H |
40 | |
41 | #ifdef __cplusplus |
42 | extern "C" { |
43 | #endif |
44 | |
45 | /*----- Header files ------------------------------------------------------*/ |
46 | |
47 | #include <stddef.h> |
48 | |
49 | #include <mLib/bits.h> |
50 | |
51 | /*----- Magical numbers ---------------------------------------------------*/ |
52 | |
53 | #define RIJNDAEL_BLKSZ 16 |
54 | #define RIJNDAEL_KEYSZ 32 |
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55 | #define RIJNDAEL_CLASS (N, B, 128) |
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56 | |
57 | extern const octet rijndael_keysz[]; |
58 | |
59 | /*----- Data structures ---------------------------------------------------*/ |
60 | |
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61 | #define RIJNDAEL_MAXROUNDS 16 |
62 | #define RIJNDAEL_KWORDS ((RIJNDAEL_MAXROUNDS + 1) * 8) |
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63 | |
64 | typedef struct rijndael_ctx { |
65 | unsigned nr; |
66 | uint32 w[RIJNDAEL_KWORDS]; |
67 | uint32 wi[RIJNDAEL_KWORDS]; |
68 | } rijndael_ctx; |
69 | |
70 | /*----- Functions provided ------------------------------------------------*/ |
71 | |
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72 | /* --- @rijndael_setup@ --- * |
73 | * |
74 | * Arguments: @rijndael_ctx *k@ = pointer to context to initialize |
75 | * @unsigned nb@ = number of words in the block |
76 | * @const void *buf@ = pointer to buffer of key material |
77 | * @size_t sz@ = size of the key material |
78 | * |
79 | * Returns: --- |
80 | * |
81 | * Use: Low-level key-scheduling. Don't call this directly. |
82 | */ |
83 | |
84 | extern void rijndael_setup(rijndael_ctx */*k*/, unsigned /*nb*/, |
85 | const void */*buf*/, size_t /*sz*/); |
86 | |
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87 | /* --- @rijndael_init@ --- * |
88 | * |
89 | * Arguments: @rijndael_ctx *k@ = pointer to context to initialize |
90 | * @const void *buf@ = pointer to buffer of key material |
91 | * @size_t sz@ = size of the key material |
92 | * |
93 | * Returns: --- |
94 | * |
95 | * Use: Initializes a Rijndael context with a particular key. This |
96 | * implementation of Rijndael doesn't impose any particular |
97 | * limits on the key size except that it must be multiple of 4 |
98 | * bytes long. 256 bits seems sensible, though. |
99 | */ |
100 | |
101 | extern void rijndael_init(rijndael_ctx */*k*/, |
102 | const void */*buf*/, size_t /*sz*/); |
103 | |
104 | /* --- @rijndael_eblk@, @rijndael_dblk@ --- * |
105 | * |
106 | * Arguments: @const rijndael_ctx *k@ = pointer to Rijndael context |
107 | * @const uint32 s[4]@ = pointer to source block |
108 | * @uint32 d[4]@ = pointer to destination block |
109 | * |
110 | * Returns: --- |
111 | * |
112 | * Use: Low-level block encryption and decryption. |
113 | */ |
114 | |
115 | extern void rijndael_eblk(const rijndael_ctx */*k*/, |
116 | const uint32 */*s*/, uint32 */*dst*/); |
117 | extern void rijndael_dblk(const rijndael_ctx */*k*/, |
118 | const uint32 */*s*/, uint32 */*dst*/); |
119 | |
120 | /*----- That's all, folks -------------------------------------------------*/ |
121 | |
122 | #ifdef __cplusplus |
123 | } |
124 | #endif |
125 | |
126 | #endif |