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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: rc5.h,v 1.4 2004/04/08 01:36:15 mdw Exp $ |
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4 | * |
5 | * The RC5-32/12 block cipher |
6 | * |
7 | * (c) 1999 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 RC5 block cipher -------------------------------------* |
31 | * |
32 | * RC5 was designed by Ron Rivest as a test vehicle for the use of data- |
33 | * dependent rotations in cryptographic transformations. The algorithm is |
34 | * covered by a patent held by RSA Security Inc. (US Patent# 5,724,428). |
35 | * It's vulnerable to some clever differential attacks, which can break it in |
36 | * about %$2^{44}$% chosen plaintexts. I don't recommend the use of this |
37 | * cipher. |
38 | */ |
39 | |
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40 | #ifndef CATACOMB_RC5_H |
41 | #define CATACOMB_RC5_H |
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42 | |
43 | #ifdef __cplusplus |
44 | extern "C" { |
45 | #endif |
46 | |
47 | /*----- Header files ------------------------------------------------------*/ |
48 | |
49 | #include <mLib/bits.h> |
50 | |
51 | /*----- Magic numbers -----------------------------------------------------*/ |
52 | |
53 | #define RC5_ROUNDS 12 |
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54 | #define RC5_KEYSZ 10 |
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55 | #define RC5_BLKSZ 8 |
56 | #define RC5_CLASS (N, L, 64) |
57 | |
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58 | extern const octet rc5_keysz[]; |
59 | |
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60 | /*----- Data structures ---------------------------------------------------*/ |
61 | |
62 | typedef struct rc5_ctx { |
63 | uint32 s[2 * (RC5_ROUNDS + 1)]; |
64 | } rc5_ctx; |
65 | |
66 | /*----- Functions provided ------------------------------------------------*/ |
67 | |
68 | /* --- @rc5_init@ --- * |
69 | * |
70 | * Arguments: @rc5_ctx *k@ = pointer to a key block |
71 | * @const void *sbuf@ = pointer to key material |
72 | * @size_t sz@ = size of the key material |
73 | * |
74 | * Returns: --- |
75 | * |
76 | * Use: Initializes an RC5 key block. |
77 | */ |
78 | |
79 | extern void rc5_init(rc5_ctx */*k*/, const void */*sbuf*/, size_t /*sz*/); |
80 | |
81 | /* --- @rc5_eblk@, @rc5_dblk@ --- * |
82 | * |
83 | * Arguments: @const rc5_ctx *k@ = pointer to RC5 context block |
84 | * @const uint32 s[2]@ = pointer to source block |
85 | * @uint32 *d[2]@ = pointer to destination block |
86 | * |
87 | * Returns: --- |
88 | * |
89 | * Use: Low level block encryption and decryption. |
90 | */ |
91 | |
92 | extern void rc5_eblk(const rc5_ctx */*k*/, |
93 | const uint32 */*s*/, uint32 */*d*/); |
94 | extern void rc5_dblk(const rc5_ctx */*k*/, |
95 | const uint32 */*s*/, uint32 */*d*/); |
96 | |
97 | /*----- That's all, folks -------------------------------------------------*/ |
98 | |
99 | #ifdef __cplusplus |
100 | } |
101 | #endif |
102 | |
103 | #endif |