3 * $Id: md4.h,v 1.4 2000/10/15 19:09:20 mdw Exp $
5 * The MD4 message digest function
7 * (c) 1998 Straylight/Edgeware
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of Catacomb.
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.
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.
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,
30 /*----- Revision history --------------------------------------------------*
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.
37 * Revision 1.3 2000/06/17 11:32:52 mdw
38 * Change buffer offset to be unsigned.
40 * Revision 1.2 1999/12/10 23:20:03 mdw
41 * New hash interface requirements.
43 * Revision 1.1 1999/09/03 08:41:12 mdw
48 /*----- Notes on the MD4 hash function ------------------------------------*
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.
57 #ifndef CATACOMB_MD4_H
58 #define CATACOMB_MD4_H
64 /*----- Header files ------------------------------------------------------*/
66 #include <mLib/bits.h>
68 #ifndef CATACOMB_GHASH_H
72 /*----- Magic numbers -----------------------------------------------------*/
76 #define MD4_STATESZ 16
78 /*----- Data structures ---------------------------------------------------*/
80 typedef struct md4_ctx
{
81 uint32 a
, b
, c
, d
; /* Chaining variables */
82 uint32 nl
, nh
; /* Byte count so far */
83 unsigned off
; /* Offset into buffer */
84 octet buf
[MD4_BUFSZ
]; /* Accumulation buffer */
87 /*----- Functions provided ------------------------------------------------*/
89 /* --- @md4_compress@ --- *
91 * Arguments: @md4_ctx *ctx@ = pointer to context block
92 * @const void *sbuf@ = pointer to buffer of appropriate size
96 * Use: MD4 compression function.
99 extern void md4_compress(md4_ctx */
*ctx*/
, const void */
*sbuf*/
);
101 /* --- @md4_init@ --- *
103 * Arguments: @md4_ctx *ctx@ = pointer to context block to initialize
107 * Use: Initializes a context block ready for hashing.
110 extern void md4_init(md4_ctx */
*ctx*/
);
112 /* --- @md4_set@ --- *
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
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.
125 extern void md4_set(md4_ctx */
*ctx*/
, const void */
*buf*/
,
126 unsigned long /*count*/);
128 /* --- @md4_hash@ --- *
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
136 * Use: Hashes a buffer of data. The buffer may be of any size and
140 extern void md4_hash(md4_ctx */
*ctx*/
, const void */
*buf*/
, size_t /*sz*/);
142 /* --- @md4_done@ --- *
144 * Arguments: @md4_ctx *ctx@ = pointer to context block
145 * @void *hash@ = pointer to output buffer
149 * Use: Returns the hash of the data read so far.
152 extern void md4_done(md4_ctx */
*ctx*/
, void */
*hash*/
);
154 /* --- @md4_state@ --- *
156 * Arguments: @md4_ctx *ctx@ = pointer to context
157 * @void *state@ = pointer to buffer for current state
159 * Returns: Number of bytes written to the hash function so far.
161 * Use: Returns the current state of the hash function such that
162 * it can be passed to @md4_set@.
165 extern unsigned long md4_state(md4_ctx */
*ctx*/
, void */
*state*/
);
167 /*----- Generic hash interface --------------------------------------------*/
169 extern const gchash md4
;
171 /*----- That's all, folks -------------------------------------------------*/