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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: md4.h,v 1.2 1999/12/10 23:20:03 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 1.2 1999/12/10 23:20:03 mdw |
34 | * New hash interface requirements. |
35 | * |
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36 | * Revision 1.1 1999/09/03 08:41:12 mdw |
37 | * Initial import. |
38 | * |
39 | */ |
40 | |
41 | /*----- Notes on the MD4 hash function ------------------------------------* |
42 | * |
43 | * MD4 was designed by Ron Rivest. It's now well and truly broken: not only |
44 | * have collisions been discovered, a slightly cut-down version has been |
45 | * shown to be non-preimage-resistant. On the other hand, MD4 is fast and |
46 | * makes a good heavy-duty checksum. Just don't rely on it being |
47 | * cryptographically strong, 'cos it ain't. |
48 | */ |
49 | |
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50 | #ifndef CATACOMB_MD4_H |
51 | #define CATACOMB_MD4_H |
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52 | |
53 | #ifdef __cplusplus |
54 | extern "C" { |
55 | #endif |
56 | |
57 | /*----- Header files ------------------------------------------------------*/ |
58 | |
59 | #include <mLib/bits.h> |
60 | |
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61 | #ifndef CATACOMB_GHASH_H |
62 | # include "ghash.h" |
63 | #endif |
64 | |
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65 | /*----- Magic numbers -----------------------------------------------------*/ |
66 | |
67 | #define MD4_BUFSZ 64 |
68 | #define MD4_HASHSZ 16 |
69 | |
70 | /*----- Data structures ---------------------------------------------------*/ |
71 | |
72 | typedef struct md4_ctx { |
73 | uint32 a, b, c, d; /* Chaining variables */ |
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74 | uint32 nl, nh; /* Byte count so far */ |
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75 | int off; /* Offset into buffer */ |
76 | octet buf[MD4_BUFSZ]; /* Accumulation buffer */ |
77 | } md4_ctx; |
78 | |
79 | /*----- Functions provided ------------------------------------------------*/ |
80 | |
81 | /* --- @md4_compress@ --- * |
82 | * |
83 | * Arguments: @md4_ctx *ctx@ = pointer to context block |
84 | * @const void *sbuf@ = pointer to buffer of appropriate size |
85 | * |
86 | * Returns: --- |
87 | * |
88 | * Use: MD4 compression function. |
89 | */ |
90 | |
91 | extern void md4_compress(md4_ctx */*ctx*/, const void */*sbuf*/); |
92 | |
93 | /* --- @md4_init@ --- * |
94 | * |
95 | * Arguments: @md4_ctx *ctx@ = pointer to context block to initialize |
96 | * |
97 | * Returns: --- |
98 | * |
99 | * Use: Initializes a context block ready for hashing. |
100 | */ |
101 | |
102 | extern void md4_init(md4_ctx */*ctx*/); |
103 | |
104 | /* --- @md4_set@ --- * |
105 | * |
106 | * Arguments: @md4_ctx *ctx@ = pointer to context block |
107 | * @const void *buf@ = pointer to state buffer |
108 | * @unsigned long count@ = current count of bytes processed |
109 | * |
110 | * Returns: --- |
111 | * |
112 | * Use: Initializes a context block from a given state. This is |
113 | * useful in cases where the initial hash state is meant to be |
114 | * secret, e.g., for NMAC and HMAC support. |
115 | */ |
116 | |
117 | extern void md4_set(md4_ctx */*ctx*/, const void */*buf*/, |
118 | unsigned long /*count*/); |
119 | |
120 | /* --- @md4_hash@ --- * |
121 | * |
122 | * Arguments: @md4_ctx *ctx@ = pointer to context block |
123 | * @const void *buf@ = buffer of data to hash |
124 | * @size_t sz@ = size of buffer to hash |
125 | * |
126 | * Returns: --- |
127 | * |
128 | * Use: Hashes a buffer of data. The buffer may be of any size and |
129 | * alignment. |
130 | */ |
131 | |
132 | extern void md4_hash(md4_ctx */*ctx*/, const void */*buf*/, size_t /*sz*/); |
133 | |
134 | /* --- @md4_done@ --- * |
135 | * |
136 | * Arguments: @md4_ctx *ctx@ = pointer to context block |
137 | * @void *hash@ = pointer to output buffer |
138 | * |
139 | * Returns: --- |
140 | * |
141 | * Use: Returns the hash of the data read so far. |
142 | */ |
143 | |
144 | extern void md4_done(md4_ctx */*ctx*/, void */*hash*/); |
145 | |
146 | /* --- @md4_state@ --- * |
147 | * |
148 | * Arguments: @md4_ctx *ctx@ = pointer to context |
149 | * @void *state@ = pointer to buffer for current state |
150 | * |
151 | * Returns: Number of bytes written to the hash function so far. |
152 | * |
153 | * Use: Returns the current state of the hash function such that |
154 | * it can be passed to @md4_set@. |
155 | */ |
156 | |
157 | extern unsigned long md4_state(md4_ctx */*ctx*/, void */*state*/); |
158 | |
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159 | /*----- Generic hash interface --------------------------------------------*/ |
160 | |
161 | extern const gchash md4; |
162 | |
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163 | /*----- That's all, folks -------------------------------------------------*/ |
164 | |
165 | #ifdef __cplusplus |
166 | } |
167 | #endif |
168 | |
169 | #endif |