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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: rmd256.h,v 1.2 2000/10/15 19:09:20 mdw Exp $ |
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4 | * |
5 | * The RIPEMD-256 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: rmd256.h,v $ |
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33 | * Revision 1.2 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 1.1 2000/07/09 21:30:31 mdw |
38 | * New RIPEMD variants. |
39 | * |
40 | */ |
41 | |
42 | /*----- Notes on the RIPEMD-256 hash function -----------------------------* |
43 | * |
44 | * RIPEMD-256 was invented by Hans Dobbertin, Antoon Bosselaers and Bart |
45 | * Preneel. It's a double-width version of RIPEMD-128, constructed simply by |
46 | * not gluing together the two parallel computations which RIPEMD-128 usually |
47 | * does in its compression function. The authors warn that, while its output |
48 | * is twice as wide as that of RIPEMD-128, they don't expect it to offer any |
49 | * more security. |
50 | */ |
51 | |
52 | #ifndef CATACOMB_RMD256_H |
53 | #define CATACOMB_RMD256_H |
54 | |
55 | #ifdef __cplusplus |
56 | extern "C" { |
57 | #endif |
58 | |
59 | /*----- Header files ------------------------------------------------------*/ |
60 | |
61 | #include <mLib/bits.h> |
62 | |
63 | #ifndef CATACOMB_GHASH_H |
64 | # include "ghash.h" |
65 | #endif |
66 | |
67 | /*----- Magic numbers -----------------------------------------------------*/ |
68 | |
69 | #define RMD256_BUFSZ 64 |
70 | #define RMD256_HASHSZ 32 |
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71 | #define RMD256_STATESZ 32 |
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72 | |
73 | /*----- Data structures ---------------------------------------------------*/ |
74 | |
75 | typedef struct rmd256_ctx { |
76 | uint32 a, b, c, d; /* Chaining variables */ |
77 | uint32 A, B, C, D; /* More chaining variables */ |
78 | uint32 nl, nh; /* Byte count so far */ |
79 | unsigned off; /* Offset into buffer */ |
80 | octet buf[RMD256_BUFSZ]; /* Accumulation buffer */ |
81 | } rmd256_ctx; |
82 | |
83 | /*----- Functions provided ------------------------------------------------*/ |
84 | |
85 | /* --- @rmd256_compress@ --- * |
86 | * |
87 | * Arguments: @rmd256_ctx *ctx@ = pointer to context block |
88 | * @const void *sbuf@ = pointer to buffer of appropriate size |
89 | * |
90 | * Returns: --- |
91 | * |
92 | * Use: RIPEMD-256 compression function. |
93 | */ |
94 | |
95 | extern void rmd256_compress(rmd256_ctx */*ctx*/, const void */*sbuf*/); |
96 | |
97 | /* --- @rmd256_init@ --- * |
98 | * |
99 | * Arguments: @rmd256_ctx *ctx@ = pointer to context block to initialize |
100 | * |
101 | * Returns: --- |
102 | * |
103 | * Use: Initializes a context block ready for hashing. |
104 | */ |
105 | |
106 | extern void rmd256_init(rmd256_ctx */*ctx*/); |
107 | |
108 | /* --- @rmd256_set@ --- * |
109 | * |
110 | * Arguments: @rmd256_ctx *ctx@ = pointer to context block |
111 | * @const void *buf@ = pointer to state buffer |
112 | * @unsigned long count@ = current count of bytes processed |
113 | * |
114 | * Returns: --- |
115 | * |
116 | * Use: Initializes a context block from a given state. This is |
117 | * useful in cases where the initial hash state is meant to be |
118 | * secret, e.g., for NMAC and HMAC support. |
119 | */ |
120 | |
121 | extern void rmd256_set(rmd256_ctx */*ctx*/, |
122 | const void */*buf*/, unsigned long /*count*/); |
123 | |
124 | /* --- @rmd256_hash@ --- * |
125 | * |
126 | * Arguments: @rmd256_ctx *ctx@ = pointer to context block |
127 | * @const void *buf@ = buffer of data to hash |
128 | * @size_t sz@ = size of buffer to hash |
129 | * |
130 | * Returns: --- |
131 | * |
132 | * Use: Hashes a buffer of data. The buffer may be of any size and |
133 | * alignment. |
134 | */ |
135 | |
136 | extern void rmd256_hash(rmd256_ctx */*ctx*/, |
137 | const void */*buf*/, size_t /*sz*/); |
138 | |
139 | /* --- @rmd256_done@ --- * |
140 | * |
141 | * Arguments: @rmd256_ctx *ctx@ = pointer to context block |
142 | * @void *hash@ = pointer to output buffer |
143 | * |
144 | * Returns: --- |
145 | * |
146 | * Use: Returns the hash of the data read so far. |
147 | */ |
148 | |
149 | extern void rmd256_done(rmd256_ctx */*ctx*/, void */*hash*/); |
150 | |
151 | /* --- @rmd256_state@ --- * |
152 | * |
153 | * Arguments: @rmd256_ctx *ctx@ = pointer to context |
154 | * @void *state@ = pointer to buffer for current state |
155 | * |
156 | * Returns: Number of bytes written to the hash function so far. |
157 | * |
158 | * Use: Returns the current state of the hash function such that |
159 | * it can be passed to @rmd256_set@. |
160 | */ |
161 | |
162 | extern unsigned long rmd256_state(rmd256_ctx */*ctx*/, void */*state*/); |
163 | |
164 | /*----- Generic hash interface --------------------------------------------*/ |
165 | |
166 | extern const gchash rmd256; |
167 | |
168 | /*----- That's all, folks -------------------------------------------------*/ |
169 | |
170 | #ifdef __cplusplus |
171 | } |
172 | #endif |
173 | |
174 | #endif |