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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: serpent.h,v 1.2 2000/10/08 15:48:58 mdw Exp $ |
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4 | * |
5 | * The Serpent block cipher |
6 | * |
7 | * (c) 2000 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: serpent.h,v $ |
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33 | * Revision 1.2 2000/10/08 15:48:58 mdw |
34 | * Update comments now that AES has been chosen. |
35 | * |
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36 | * Revision 1.1 2000/06/17 12:08:43 mdw |
37 | * New cipher. |
38 | * |
39 | */ |
40 | |
41 | /*----- Notes on the Serpent block cipher ---------------------------------* |
42 | * |
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43 | * Serpent was designed and proposed for the AES contest by Ross Anderson, |
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44 | * Eli Biham and Lars Knudsen. It's not particularly quick, but is |
45 | * stunningly secure. The best differential and linear attacks are |
46 | * speculated to require %$2^{256}$% texts (it's a 128-bit block cipher). |
47 | * The designers originally intended to file a patent, but failed to persue |
48 | * it. Use of the algorithm is completely unencumbered. |
49 | */ |
50 | |
51 | #ifndef CATACOMB_SERPENT_H |
52 | #define CATACOMB_SERPENT_H |
53 | |
54 | #ifdef __cplusplus |
55 | extern "C" { |
56 | #endif |
57 | |
58 | /*----- Header files ------------------------------------------------------*/ |
59 | |
60 | #include <stddef.h> |
61 | |
62 | #include <mLib/bits.h> |
63 | |
64 | /*----- Magic numbers -----------------------------------------------------*/ |
65 | |
66 | #define SERPENT_BLKSZ 16 |
67 | #define SERPENT_KEYSZ 32 |
68 | #define SERPENT_CLASS (N, L, 128) |
69 | |
70 | extern const octet serpent_keysz[]; |
71 | |
72 | /*----- Data structures ---------------------------------------------------*/ |
73 | |
74 | typedef struct serpent_ctx { |
75 | uint32 k[4 * 33]; |
76 | } serpent_ctx; |
77 | |
78 | /*----- Functions provided ------------------------------------------------*/ |
79 | |
80 | /* --- @serpent_init@ --- * |
81 | * |
82 | * Arguments: @serpent_ctx *k@ = pointer to context block to initialize |
83 | * @const void *buf@ = pointer to input buffer |
84 | * @size_t sz@ = size of input buffer |
85 | * |
86 | * Returns: --- |
87 | * |
88 | * Use: Initializes a Serpent context. The key may be any length of |
89 | * up to 32 bytes (256 bits). |
90 | */ |
91 | |
92 | extern void serpent_init(serpent_ctx */*k*/, |
93 | const void */*buf*/, size_t /*sz*/); |
94 | |
95 | /* --- @serpent_eblk@, @serpent_dblk@ --- * |
96 | * |
97 | * Arguments: @const serpent_ctx *k@ = pointer to key context |
98 | * @const uint32 s[4]@ = pointer to source block |
99 | * @uint32 d[4]@ = pointer to destination block |
100 | * |
101 | * Returns: --- |
102 | * |
103 | * Use: Low-level block encryption. |
104 | */ |
105 | |
106 | extern void serpent_eblk(const serpent_ctx */*k*/, |
107 | const uint32 */*s*/, uint32 */*d*/); |
108 | extern void serpent_dblk(const serpent_ctx */*k*/, |
109 | const uint32 */*s*/, uint32 */*d*/); |
110 | |
111 | /*----- That's all, folks -------------------------------------------------*/ |
112 | |
113 | #ifdef __cplusplus |
114 | } |
115 | #endif |
116 | |
117 | #endif |