3 * $Id: md2.h,v 1.1 2001/02/21 20:03:22 mdw Exp $
5 * The MD2 message digest function
7 * (c) 2001 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 1.1 2001/02/21 20:03:22 mdw
34 * Added support for MD2 hash function.
38 /*----- Notes on the MD2 hash function ------------------------------------*
40 * MD2 was designed by Ron Rivest. It's not recommended for new applications
41 * because only the `checksum' part of the function resists collision-finding
42 * attacks. It's not very fast either. However, it's still used in
43 * standards, and having it available can be useful.
46 #ifndef CATACOMB_MD2_H
47 #define CATACOMB_MD2_H
53 /*----- Header files ------------------------------------------------------*/
55 #include <mLib/bits.h>
57 #ifndef CATACOMB_GHASH_H
61 /*----- Magic numbers -----------------------------------------------------*/
65 #define MD2_STATESZ 32
67 /*----- Data structures ---------------------------------------------------*/
69 typedef struct md2_ctx
{
70 octet c
[MD2_BUFSZ
]; /* Checksum buffer */
71 octet h
[MD2_BUFSZ
]; /* Hash result buffer */
72 octet buf
[MD2_BUFSZ
]; /* Input buffer */
73 unsigned off
; /* Offset into buffer */
76 /*----- Functions provided ------------------------------------------------*/
78 /* --- @md2_compress@ --- *
80 * Arguments: @md2_ctx *ctx@ = pointer to context block
81 * @const void *sbuf@ = pointer to buffer of appropriate size
85 * Use: MD2 compression function.
88 extern void md2_compress(md2_ctx */
*ctx*/
, const void */
*sbuf*/
);
90 /* --- @md2_init@ --- *
92 * Arguments: @md2_ctx *ctx@ = pointer to context block to initialize
96 * Use: Initializes a context block ready for hashing.
99 extern void md2_init(md2_ctx */
*ctx*/
);
101 /* --- @md2_set@ --- *
103 * Arguments: @md2_ctx *ctx@ = pointer to context block
104 * @const void *buf@ = pointer to state buffer
105 * @unsigned long count@ = current count of bytes processed
109 * Use: Initializes a context block from a given state. This is
110 * useful in cases where the initial hash state is meant to be
111 * secret, e.g., for NMAC and HMAC support.
114 extern void md2_set(md2_ctx */
*ctx*/
, const void */
*buf*/
,
115 unsigned long /*count*/);
117 /* --- @md2_hash@ --- *
119 * Arguments: @md2_ctx *ctx@ = pointer to context block
120 * @const void *buf@ = buffer of data to hash
121 * @size_t sz@ = size of buffer to hash
125 * Use: Hashes a buffer of data. The buffer may be of any size and
129 extern void md2_hash(md2_ctx */
*ctx*/
, const void */
*buf*/
, size_t /*sz*/);
131 /* --- @md2_done@ --- *
133 * Arguments: @md2_ctx *ctx@ = pointer to context block
134 * @void *hash@ = pointer to output buffer
138 * Use: Returns the hash of the data read so far.
141 extern void md2_done(md2_ctx */
*ctx*/
, void */
*hash*/
);
143 /* --- @md2_state@ --- *
145 * Arguments: @md2_ctx *ctx@ = pointer to context
146 * @void *state@ = pointer to buffer for current state
148 * Returns: Number of bytes written to the hash function so far.
150 * Use: Returns the current state of the hash function such that
151 * it can be passed to @md2_set@.
154 extern unsigned long md2_state(md2_ctx */
*ctx*/
, void */
*state*/
);
156 /*----- Generic hash interface --------------------------------------------*/
158 extern const gchash md2
;
160 /*----- That's all, folks -------------------------------------------------*/