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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: md4.h,v 1.4 2000/10/15 19:09:20 mdw Exp $ |
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4 | * |
5 | * The MD4 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: md4.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 MD4 hash function ------------------------------------* |
49 | * |
50 | * MD4 was designed by Ron Rivest. It's now well and truly broken: not only |
51 | * have collisions been discovered, a slightly cut-down version has been |
52 | * shown to be non-preimage-resistant. On the other hand, MD4 is fast and |
53 | * makes a good heavy-duty checksum. Just don't rely on it being |
54 | * cryptographically strong, 'cos it ain't. |
55 | */ |
56 | |
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57 | #ifndef CATACOMB_MD4_H |
58 | #define CATACOMB_MD4_H |
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59 | |
60 | #ifdef __cplusplus |
61 | extern "C" { |
62 | #endif |
63 | |
64 | /*----- Header files ------------------------------------------------------*/ |
65 | |
66 | #include <mLib/bits.h> |
67 | |
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68 | #ifndef CATACOMB_GHASH_H |
69 | # include "ghash.h" |
70 | #endif |
71 | |
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72 | /*----- Magic numbers -----------------------------------------------------*/ |
73 | |
74 | #define MD4_BUFSZ 64 |
75 | #define MD4_HASHSZ 16 |
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76 | #define MD4_STATESZ 16 |
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77 | |
78 | /*----- Data structures ---------------------------------------------------*/ |
79 | |
80 | typedef struct md4_ctx { |
81 | uint32 a, b, c, d; /* Chaining variables */ |
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82 | uint32 nl, nh; /* Byte count so far */ |
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83 | unsigned off; /* Offset into buffer */ |
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84 | octet buf[MD4_BUFSZ]; /* Accumulation buffer */ |
85 | } md4_ctx; |
86 | |
87 | /*----- Functions provided ------------------------------------------------*/ |
88 | |
89 | /* --- @md4_compress@ --- * |
90 | * |
91 | * Arguments: @md4_ctx *ctx@ = pointer to context block |
92 | * @const void *sbuf@ = pointer to buffer of appropriate size |
93 | * |
94 | * Returns: --- |
95 | * |
96 | * Use: MD4 compression function. |
97 | */ |
98 | |
99 | extern void md4_compress(md4_ctx */*ctx*/, const void */*sbuf*/); |
100 | |
101 | /* --- @md4_init@ --- * |
102 | * |
103 | * Arguments: @md4_ctx *ctx@ = pointer to context block to initialize |
104 | * |
105 | * Returns: --- |
106 | * |
107 | * Use: Initializes a context block ready for hashing. |
108 | */ |
109 | |
110 | extern void md4_init(md4_ctx */*ctx*/); |
111 | |
112 | /* --- @md4_set@ --- * |
113 | * |
114 | * Arguments: @md4_ctx *ctx@ = pointer to context block |
115 | * @const void *buf@ = pointer to state buffer |
116 | * @unsigned long count@ = current count of bytes processed |
117 | * |
118 | * Returns: --- |
119 | * |
120 | * Use: Initializes a context block from a given state. This is |
121 | * useful in cases where the initial hash state is meant to be |
122 | * secret, e.g., for NMAC and HMAC support. |
123 | */ |
124 | |
125 | extern void md4_set(md4_ctx */*ctx*/, const void */*buf*/, |
126 | unsigned long /*count*/); |
127 | |
128 | /* --- @md4_hash@ --- * |
129 | * |
130 | * Arguments: @md4_ctx *ctx@ = pointer to context block |
131 | * @const void *buf@ = buffer of data to hash |
132 | * @size_t sz@ = size of buffer to hash |
133 | * |
134 | * Returns: --- |
135 | * |
136 | * Use: Hashes a buffer of data. The buffer may be of any size and |
137 | * alignment. |
138 | */ |
139 | |
140 | extern void md4_hash(md4_ctx */*ctx*/, const void */*buf*/, size_t /*sz*/); |
141 | |
142 | /* --- @md4_done@ --- * |
143 | * |
144 | * Arguments: @md4_ctx *ctx@ = pointer to context block |
145 | * @void *hash@ = pointer to output buffer |
146 | * |
147 | * Returns: --- |
148 | * |
149 | * Use: Returns the hash of the data read so far. |
150 | */ |
151 | |
152 | extern void md4_done(md4_ctx */*ctx*/, void */*hash*/); |
153 | |
154 | /* --- @md4_state@ --- * |
155 | * |
156 | * Arguments: @md4_ctx *ctx@ = pointer to context |
157 | * @void *state@ = pointer to buffer for current state |
158 | * |
159 | * Returns: Number of bytes written to the hash function so far. |
160 | * |
161 | * Use: Returns the current state of the hash function such that |
162 | * it can be passed to @md4_set@. |
163 | */ |
164 | |
165 | extern unsigned long md4_state(md4_ctx */*ctx*/, void */*state*/); |
166 | |
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167 | /*----- Generic hash interface --------------------------------------------*/ |
168 | |
169 | extern const gchash md4; |
170 | |
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171 | /*----- That's all, folks -------------------------------------------------*/ |
172 | |
173 | #ifdef __cplusplus |
174 | } |
175 | #endif |
176 | |
177 | #endif |