d03ab969 |
1 | /* -*-c-*- |
2 | * |
3 | * $Id: md4.h,v 1.1 1999/09/03 08:41:12 mdw Exp $ |
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 $ |
33 | * Revision 1.1 1999/09/03 08:41:12 mdw |
34 | * Initial import. |
35 | * |
36 | */ |
37 | |
38 | /*----- Notes on the MD4 hash function ------------------------------------* |
39 | * |
40 | * MD4 was designed by Ron Rivest. It's now well and truly broken: not only |
41 | * have collisions been discovered, a slightly cut-down version has been |
42 | * shown to be non-preimage-resistant. On the other hand, MD4 is fast and |
43 | * makes a good heavy-duty checksum. Just don't rely on it being |
44 | * cryptographically strong, 'cos it ain't. |
45 | */ |
46 | |
47 | #ifndef MD4_H |
48 | #define MD4_H |
49 | |
50 | #ifdef __cplusplus |
51 | extern "C" { |
52 | #endif |
53 | |
54 | /*----- Header files ------------------------------------------------------*/ |
55 | |
56 | #include <mLib/bits.h> |
57 | |
58 | /*----- Magic numbers -----------------------------------------------------*/ |
59 | |
60 | #define MD4_BUFSZ 64 |
61 | #define MD4_HASHSZ 16 |
62 | |
63 | /*----- Data structures ---------------------------------------------------*/ |
64 | |
65 | typedef struct md4_ctx { |
66 | uint32 a, b, c, d; /* Chaining variables */ |
67 | unsigned long count; /* Byte count so far */ |
68 | int off; /* Offset into buffer */ |
69 | octet buf[MD4_BUFSZ]; /* Accumulation buffer */ |
70 | } md4_ctx; |
71 | |
72 | /*----- Functions provided ------------------------------------------------*/ |
73 | |
74 | /* --- @md4_compress@ --- * |
75 | * |
76 | * Arguments: @md4_ctx *ctx@ = pointer to context block |
77 | * @const void *sbuf@ = pointer to buffer of appropriate size |
78 | * |
79 | * Returns: --- |
80 | * |
81 | * Use: MD4 compression function. |
82 | */ |
83 | |
84 | extern void md4_compress(md4_ctx */*ctx*/, const void */*sbuf*/); |
85 | |
86 | /* --- @md4_init@ --- * |
87 | * |
88 | * Arguments: @md4_ctx *ctx@ = pointer to context block to initialize |
89 | * |
90 | * Returns: --- |
91 | * |
92 | * Use: Initializes a context block ready for hashing. |
93 | */ |
94 | |
95 | extern void md4_init(md4_ctx */*ctx*/); |
96 | |
97 | /* --- @md4_set@ --- * |
98 | * |
99 | * Arguments: @md4_ctx *ctx@ = pointer to context block |
100 | * @const void *buf@ = pointer to state buffer |
101 | * @unsigned long count@ = current count of bytes processed |
102 | * |
103 | * Returns: --- |
104 | * |
105 | * Use: Initializes a context block from a given state. This is |
106 | * useful in cases where the initial hash state is meant to be |
107 | * secret, e.g., for NMAC and HMAC support. |
108 | */ |
109 | |
110 | extern void md4_set(md4_ctx */*ctx*/, const void */*buf*/, |
111 | unsigned long /*count*/); |
112 | |
113 | /* --- @md4_hash@ --- * |
114 | * |
115 | * Arguments: @md4_ctx *ctx@ = pointer to context block |
116 | * @const void *buf@ = buffer of data to hash |
117 | * @size_t sz@ = size of buffer to hash |
118 | * |
119 | * Returns: --- |
120 | * |
121 | * Use: Hashes a buffer of data. The buffer may be of any size and |
122 | * alignment. |
123 | */ |
124 | |
125 | extern void md4_hash(md4_ctx */*ctx*/, const void */*buf*/, size_t /*sz*/); |
126 | |
127 | /* --- @md4_done@ --- * |
128 | * |
129 | * Arguments: @md4_ctx *ctx@ = pointer to context block |
130 | * @void *hash@ = pointer to output buffer |
131 | * |
132 | * Returns: --- |
133 | * |
134 | * Use: Returns the hash of the data read so far. |
135 | */ |
136 | |
137 | extern void md4_done(md4_ctx */*ctx*/, void */*hash*/); |
138 | |
139 | /* --- @md4_state@ --- * |
140 | * |
141 | * Arguments: @md4_ctx *ctx@ = pointer to context |
142 | * @void *state@ = pointer to buffer for current state |
143 | * |
144 | * Returns: Number of bytes written to the hash function so far. |
145 | * |
146 | * Use: Returns the current state of the hash function such that |
147 | * it can be passed to @md4_set@. |
148 | */ |
149 | |
150 | extern unsigned long md4_state(md4_ctx */*ctx*/, void */*state*/); |
151 | |
152 | /*----- That's all, folks -------------------------------------------------*/ |
153 | |
154 | #ifdef __cplusplus |
155 | } |
156 | #endif |
157 | |
158 | #endif |