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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: rc5.h,v 1.3 2000/06/17 11:55:50 mdw Exp $ |
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4 | * |
5 | * The RC5-32/12 block cipher |
6 | * |
7 | * (c) 1999 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: rc5.h,v $ |
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33 | * Revision 1.3 2000/06/17 11:55:50 mdw |
34 | * New key size interface. Add notes about the cipher. |
35 | * |
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36 | * Revision 1.2 1999/12/10 23:29:48 mdw |
37 | * Change header file guard names. |
38 | * |
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39 | * Revision 1.1 1999/09/03 08:41:12 mdw |
40 | * Initial import. |
41 | * |
42 | */ |
43 | |
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44 | /*----- Notes on the RC5 block cipher -------------------------------------* |
45 | * |
46 | * RC5 was designed by Ron Rivest as a test vehicle for the use of data- |
47 | * dependent rotations in cryptographic transformations. The algorithm is |
48 | * covered by a patent held by RSA Security Inc. (US Patent# 5,724,428). |
49 | * It's vulnerable to some clever differential attacks, which can break it in |
50 | * about %$2^{44}$% chosen plaintexts. I don't recommend the use of this |
51 | * cipher. |
52 | */ |
53 | |
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54 | #ifndef CATACOMB_RC5_H |
55 | #define CATACOMB_RC5_H |
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56 | |
57 | #ifdef __cplusplus |
58 | extern "C" { |
59 | #endif |
60 | |
61 | /*----- Header files ------------------------------------------------------*/ |
62 | |
63 | #include <mLib/bits.h> |
64 | |
65 | /*----- Magic numbers -----------------------------------------------------*/ |
66 | |
67 | #define RC5_ROUNDS 12 |
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68 | #define RC5_KEYSZ 10 |
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69 | #define RC5_BLKSZ 8 |
70 | #define RC5_CLASS (N, L, 64) |
71 | |
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72 | extern const octet rc5_keysz[]; |
73 | |
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74 | /*----- Data structures ---------------------------------------------------*/ |
75 | |
76 | typedef struct rc5_ctx { |
77 | uint32 s[2 * (RC5_ROUNDS + 1)]; |
78 | } rc5_ctx; |
79 | |
80 | /*----- Functions provided ------------------------------------------------*/ |
81 | |
82 | /* --- @rc5_init@ --- * |
83 | * |
84 | * Arguments: @rc5_ctx *k@ = pointer to a key block |
85 | * @const void *sbuf@ = pointer to key material |
86 | * @size_t sz@ = size of the key material |
87 | * |
88 | * Returns: --- |
89 | * |
90 | * Use: Initializes an RC5 key block. |
91 | */ |
92 | |
93 | extern void rc5_init(rc5_ctx */*k*/, const void */*sbuf*/, size_t /*sz*/); |
94 | |
95 | /* --- @rc5_eblk@, @rc5_dblk@ --- * |
96 | * |
97 | * Arguments: @const rc5_ctx *k@ = pointer to RC5 context block |
98 | * @const uint32 s[2]@ = pointer to source block |
99 | * @uint32 *d[2]@ = pointer to destination block |
100 | * |
101 | * Returns: --- |
102 | * |
103 | * Use: Low level block encryption and decryption. |
104 | */ |
105 | |
106 | extern void rc5_eblk(const rc5_ctx */*k*/, |
107 | const uint32 */*s*/, uint32 */*d*/); |
108 | extern void rc5_dblk(const rc5_ctx */*k*/, |
109 | const uint32 */*s*/, uint32 */*d*/); |
110 | |
111 | /*----- That's all, folks -------------------------------------------------*/ |
112 | |
113 | #ifdef __cplusplus |
114 | } |
115 | #endif |
116 | |
117 | #endif |