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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: rmd160.h,v 1.4 2000/10/15 19:09:20 mdw Exp $ |
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4 | * |
5 | * The RIPEMD-160 message digest function |
6 | * |
7 | * (c) 1998 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: rmd160.h,v $ |
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33 | * Revision 1.4 2000/10/15 19:09:20 mdw |
34 | * Support HMAC mode for hash functions which need to store more state than |
35 | * the hash output size. |
36 | * |
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37 | * Revision 1.3 2000/06/17 11:32:52 mdw |
38 | * Change buffer offset to be unsigned. |
39 | * |
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40 | * Revision 1.2 1999/12/10 23:20:03 mdw |
41 | * New hash interface requirements. |
42 | * |
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43 | * Revision 1.1 1999/09/03 08:41:12 mdw |
44 | * Initial import. |
45 | * |
46 | */ |
47 | |
48 | /*----- Notes on the RIPEMD-160 hash function -----------------------------* |
49 | * |
50 | * RIPEMD-160 was invented by Hans Dobbertin, Antoon Bosselaers and Bart |
51 | * Preneel. It's a strengthened version of the original RIPEMD hash |
52 | * function, fixing a vulnerability discovered by Hans Dobbertin. The |
53 | * RIPEMD-160 design team appears well respected in the cryptographic |
54 | * community. The author finds them more plausible than SHA-1, which is the |
55 | * best alternative hash function. |
56 | */ |
57 | |
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58 | #ifndef CATACOMB_RMD160_H |
59 | #define CATACOMB_RMD160_H |
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60 | |
61 | #ifdef __cplusplus |
62 | extern "C" { |
63 | #endif |
64 | |
65 | /*----- Header files ------------------------------------------------------*/ |
66 | |
67 | #include <mLib/bits.h> |
68 | |
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69 | #ifndef CATACOMB_GHASH_H |
70 | # include "ghash.h" |
71 | #endif |
72 | |
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73 | /*----- Magic numbers -----------------------------------------------------*/ |
74 | |
75 | #define RMD160_BUFSZ 64 |
76 | #define RMD160_HASHSZ 20 |
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77 | #define RMD160_STATESZ 20 |
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78 | |
79 | /*----- Data structures ---------------------------------------------------*/ |
80 | |
81 | typedef struct rmd160_ctx { |
82 | uint32 a, b, c, d, e; /* Chaining variables */ |
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83 | uint32 nl, nh; /* Byte count so far */ |
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84 | unsigned off; /* Offset into buffer */ |
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85 | octet buf[RMD160_BUFSZ]; /* Accumulation buffer */ |
86 | } rmd160_ctx; |
87 | |
88 | /*----- Functions provided ------------------------------------------------*/ |
89 | |
90 | /* --- @rmd160_compress@ --- * |
91 | * |
92 | * Arguments: @rmd160_ctx *ctx@ = pointer to context block |
93 | * @const void *sbuf@ = pointer to buffer of appropriate size |
94 | * |
95 | * Returns: --- |
96 | * |
97 | * Use: RIPEMD-160 compression function. |
98 | */ |
99 | |
100 | extern void rmd160_compress(rmd160_ctx */*ctx*/, const void */*sbuf*/); |
101 | |
102 | /* --- @rmd160_init@ --- * |
103 | * |
104 | * Arguments: @rmd160_ctx *ctx@ = pointer to context block to initialize |
105 | * |
106 | * Returns: --- |
107 | * |
108 | * Use: Initializes a context block ready for hashing. |
109 | */ |
110 | |
111 | extern void rmd160_init(rmd160_ctx */*ctx*/); |
112 | |
113 | /* --- @rmd160_set@ --- * |
114 | * |
115 | * Arguments: @rmd160_ctx *ctx@ = pointer to context block |
116 | * @const void *buf@ = pointer to state buffer |
117 | * @unsigned long count@ = current count of bytes processed |
118 | * |
119 | * Returns: --- |
120 | * |
121 | * Use: Initializes a context block from a given state. This is |
122 | * useful in cases where the initial hash state is meant to be |
123 | * secret, e.g., for NMAC and HMAC support. |
124 | */ |
125 | |
126 | extern void rmd160_set(rmd160_ctx */*ctx*/, |
127 | const void */*buf*/, unsigned long /*count*/); |
128 | |
129 | /* --- @rmd160_hash@ --- * |
130 | * |
131 | * Arguments: @rmd160_ctx *ctx@ = pointer to context block |
132 | * @const void *buf@ = buffer of data to hash |
133 | * @size_t sz@ = size of buffer to hash |
134 | * |
135 | * Returns: --- |
136 | * |
137 | * Use: Hashes a buffer of data. The buffer may be of any size and |
138 | * alignment. |
139 | */ |
140 | |
141 | extern void rmd160_hash(rmd160_ctx */*ctx*/, |
142 | const void */*buf*/, size_t /*sz*/); |
143 | |
144 | /* --- @rmd160_done@ --- * |
145 | * |
146 | * Arguments: @rmd160_ctx *ctx@ = pointer to context block |
147 | * @void *hash@ = pointer to output buffer |
148 | * |
149 | * Returns: --- |
150 | * |
151 | * Use: Returns the hash of the data read so far. |
152 | */ |
153 | |
154 | extern void rmd160_done(rmd160_ctx */*ctx*/, void */*hash*/); |
155 | |
156 | /* --- @rmd160_state@ --- * |
157 | * |
158 | * Arguments: @rmd160_ctx *ctx@ = pointer to context |
159 | * @void *state@ = pointer to buffer for current state |
160 | * |
161 | * Returns: Number of bytes written to the hash function so far. |
162 | * |
163 | * Use: Returns the current state of the hash function such that |
164 | * it can be passed to @rmd160_set@. |
165 | */ |
166 | |
167 | extern unsigned long rmd160_state(rmd160_ctx */*ctx*/, void */*state*/); |
168 | |
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169 | /*----- Generic hash interface --------------------------------------------*/ |
170 | |
171 | extern const gchash rmd160; |
172 | |
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173 | /*----- That's all, folks -------------------------------------------------*/ |
174 | |
175 | #ifdef __cplusplus |
176 | } |
177 | #endif |
178 | |
179 | #endif |