Commit | Line | Data |
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621468d8 | 1 | /* -*-c-*- |
621468d8 | 2 | * |
3 | * The SAFER block cipher | |
4 | * | |
5 | * (c) 2001 Straylight/Edgeware | |
6 | */ | |
7 | ||
45c0fd36 | 8 | /*----- Licensing notice --------------------------------------------------* |
621468d8 | 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. | |
45c0fd36 | 16 | * |
621468d8 | 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. | |
45c0fd36 | 21 | * |
621468d8 | 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 | ||
5233862a | 28 | /*----- Notes on the SAFER block cipher -----------------------------------* |
29 | * | |
30 | * SAFER was designed by James Massey (who also worked on IDEA) for Cylink. | |
31 | * It's free -- patents or other silliness. The original key schedule had | |
32 | * some weaknesses, and a new one (the SK version) was added. SAFER has a | |
33 | * variable number of rounds. The standard interface uses the recommended | |
34 | * number for the given key schedule algorithm and key size. | |
35 | * | |
36 | * SAFER got a bad press in Schneier's book `Applied Cryptography'. I think | |
37 | * this is undeserved. SAFER is a well-designed cipher which mostly looks | |
38 | * pretty solid. | |
39 | */ | |
40 | ||
621468d8 | 41 | #ifndef CATACOMB_SAFER_H |
42 | #define CATACOMB_SAFER_H | |
43 | ||
44 | #ifdef __cplusplus | |
45 | extern "C" { | |
46 | #endif | |
47 | ||
48 | /*----- Header files ------------------------------------------------------*/ | |
49 | ||
50 | #include <stddef.h> | |
51 | ||
52 | #include <mLib/bits.h> | |
53 | ||
54 | /*----- Magical numbers ---------------------------------------------------*/ | |
55 | ||
56 | #define SAFER_BLKSZ 8 | |
57 | #define SAFER_KEYSZ 8 | |
58 | #define SAFER_CLASS (N, B, 64) | |
59 | ||
60 | #define SAFERSK_BLKSZ SAFER_BLKSZ | |
61 | #define SAFERSK_KEYSZ 16 | |
62 | #define SAFERSK_CLASS SAFER_CLASS | |
63 | ||
64 | #define SAFER_MAXROUNDS 12 | |
65 | ||
66 | extern const octet safer_keysz[]; | |
67 | #define safersk_keysz safer_keysz | |
68 | ||
69 | /*----- Data structures ---------------------------------------------------*/ | |
70 | ||
71 | typedef struct safer_ctx { | |
72 | octet k[8 * (2 * SAFER_MAXROUNDS + 1)]; | |
73 | unsigned r; | |
74 | } safer_ctx, safersk_ctx; | |
75 | ||
76 | /*----- Functions provided ------------------------------------------------*/ | |
77 | ||
78 | /* --- @safer_setup@ --- * | |
79 | * | |
80 | * Arguments: @safer_ctx *k@ = pointer to context to initialize | |
81 | * @unsigned r@ = number of rounds wanted | |
82 | * @unsigned f@ = various other flags | |
83 | * @const void *buf@ = pointer to key material | |
84 | * @size_t sz@ = size of key material in bytes | |
85 | * | |
86 | * Returns: --- | |
87 | * | |
7e21b65f MW |
88 | * Use: Initializes an SAFER expanded key, with lots of options |
89 | * controlling how to do it. | |
621468d8 | 90 | */ |
91 | ||
92 | #define SAFER_SK 1u | |
93 | ||
94 | extern void safer_setup(safer_ctx */*k*/, unsigned /*r*/, unsigned /*f*/, | |
95 | const void */*buf*/, size_t /*sz*/); | |
96 | ||
97 | /* --- @safer_init@, @safersk_init@ --- * | |
98 | * | |
99 | * Arguments: @safer_ctx *k@ = pointer to context to initialize | |
100 | * @const void *buf@ = pointer to key material | |
101 | * @size_t sz@ = size of key material in bytes | |
102 | * | |
103 | * Returns: --- | |
104 | * | |
105 | * Use: Initializes an SAFER expanded key. A default number of | |
106 | * rounds is chosen, based on the key length. | |
107 | */ | |
108 | ||
109 | extern void safer_init(safer_ctx */*k*/, | |
110 | const void */*buf*/, size_t /*sz*/); | |
111 | extern void safersk_init(safer_ctx */*k*/, | |
112 | const void */*buf*/, size_t /*sz*/); | |
113 | ||
114 | /* --- @safer_eblk@, @safer_dblk@ --- * | |
115 | * | |
116 | * Arguments: @const safer_ctx *k@ = pointer to SAFER context | |
117 | * @const uint32 s[2]@ = pointer to source block | |
118 | * @const uint32 d[2]@ = pointer to destination block | |
119 | * | |
120 | * Returns: --- | |
121 | * | |
122 | * Use: Low-level block encryption and decryption. | |
123 | */ | |
124 | ||
125 | extern void safer_eblk(const safer_ctx */*k*/, | |
126 | const uint32 */*s*/, uint32 */*dst*/); | |
127 | extern void safer_dblk(const safer_ctx */*k*/, | |
128 | const uint32 */*s*/, uint32 */*dst*/); | |
129 | ||
130 | #define safersk_eblk safer_eblk | |
131 | #define safersk_dblk safer_dblk | |
132 | ||
133 | /*----- That's all, folks -------------------------------------------------*/ | |
134 | ||
135 | #ifdef __cplusplus | |
136 | } | |
137 | #endif | |
138 | ||
139 | #endif |