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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: serpent.h,v 1.3 2004/04/08 01:36:15 mdw Exp $ |
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4 | * |
5 | * The Serpent block cipher |
6 | * |
7 | * (c) 2000 Straylight/Edgeware |
8 | */ |
9 | |
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10 | /*----- Licensing notice --------------------------------------------------* |
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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. |
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18 | * |
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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. |
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23 | * |
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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 Serpent block cipher ---------------------------------* |
31 | * |
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32 | * Serpent was designed and proposed for the AES contest by Ross Anderson, |
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33 | * Eli Biham and Lars Knudsen. It's not particularly quick, but is |
34 | * stunningly secure. The best differential and linear attacks are |
35 | * speculated to require %$2^{256}$% texts (it's a 128-bit block cipher). |
36 | * The designers originally intended to file a patent, but failed to persue |
37 | * it. Use of the algorithm is completely unencumbered. |
38 | */ |
39 | |
40 | #ifndef CATACOMB_SERPENT_H |
41 | #define CATACOMB_SERPENT_H |
42 | |
43 | #ifdef __cplusplus |
44 | extern "C" { |
45 | #endif |
46 | |
47 | /*----- Header files ------------------------------------------------------*/ |
48 | |
49 | #include <stddef.h> |
50 | |
51 | #include <mLib/bits.h> |
52 | |
53 | /*----- Magic numbers -----------------------------------------------------*/ |
54 | |
55 | #define SERPENT_BLKSZ 16 |
56 | #define SERPENT_KEYSZ 32 |
57 | #define SERPENT_CLASS (N, L, 128) |
58 | |
59 | extern const octet serpent_keysz[]; |
60 | |
61 | /*----- Data structures ---------------------------------------------------*/ |
62 | |
63 | typedef struct serpent_ctx { |
64 | uint32 k[4 * 33]; |
65 | } serpent_ctx; |
66 | |
67 | /*----- Functions provided ------------------------------------------------*/ |
68 | |
69 | /* --- @serpent_init@ --- * |
70 | * |
71 | * Arguments: @serpent_ctx *k@ = pointer to context block to initialize |
72 | * @const void *buf@ = pointer to input buffer |
73 | * @size_t sz@ = size of input buffer |
74 | * |
75 | * Returns: --- |
76 | * |
77 | * Use: Initializes a Serpent context. The key may be any length of |
78 | * up to 32 bytes (256 bits). |
79 | */ |
80 | |
81 | extern void serpent_init(serpent_ctx */*k*/, |
82 | const void */*buf*/, size_t /*sz*/); |
83 | |
84 | /* --- @serpent_eblk@, @serpent_dblk@ --- * |
85 | * |
86 | * Arguments: @const serpent_ctx *k@ = pointer to key context |
87 | * @const uint32 s[4]@ = pointer to source block |
88 | * @uint32 d[4]@ = pointer to destination block |
89 | * |
90 | * Returns: --- |
91 | * |
92 | * Use: Low-level block encryption. |
93 | */ |
94 | |
95 | extern void serpent_eblk(const serpent_ctx */*k*/, |
96 | const uint32 */*s*/, uint32 */*d*/); |
97 | extern void serpent_dblk(const serpent_ctx */*k*/, |
98 | const uint32 */*s*/, uint32 */*d*/); |
99 | |
100 | /*----- That's all, folks -------------------------------------------------*/ |
101 | |
102 | #ifdef __cplusplus |
103 | } |
104 | #endif |
105 | |
106 | #endif |