3 * The MD2 message digest function
5 * (c) 2001 Straylight/Edgeware
8 /*----- Licensing notice --------------------------------------------------*
10 * This file is part of Catacomb.
12 * Catacomb is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU Library General Public License as
14 * published by the Free Software Foundation; either version 2 of the
15 * License, or (at your option) any later version.
17 * Catacomb is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU Library General Public License for more details.
22 * You should have received a copy of the GNU Library General Public
23 * License along with Catacomb; if not, write to the Free
24 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
28 /*----- Notes on the MD2 hash function ------------------------------------*
30 * MD2 was designed by Ron Rivest. It's not recommended for new applications
31 * because only the `checksum' part of the function resists collision-finding
32 * attacks. It's not very fast either. However, it's still used in
33 * standards, and having it available can be useful.
36 #ifndef CATACOMB_MD2_H
37 #define CATACOMB_MD2_H
43 /*----- Header files ------------------------------------------------------*/
45 #include <mLib/bits.h>
47 #ifndef CATACOMB_GHASH_H
51 /*----- Magic numbers -----------------------------------------------------*/
55 #define MD2_STATESZ 32
57 /*----- Data structures ---------------------------------------------------*/
59 typedef struct md2_ctx {
60 octet c[MD2_BUFSZ]; /* Checksum buffer */
61 octet h[MD2_BUFSZ]; /* Hash result buffer */
62 octet buf[MD2_BUFSZ]; /* Input buffer */
63 unsigned off; /* Offset into buffer */
66 /*----- Functions provided ------------------------------------------------*/
68 /* --- @md2_compress@ --- *
70 * Arguments: @md2_ctx *ctx@ = pointer to context block
71 * @const void *sbuf@ = pointer to buffer of appropriate size
75 * Use: MD2 compression function.
78 extern void md2_compress(md2_ctx */*ctx*/, const void */*sbuf*/);
80 /* --- @md2_init@ --- *
82 * Arguments: @md2_ctx *ctx@ = pointer to context block to initialize
86 * Use: Initializes a context block ready for hashing.
89 extern void md2_init(md2_ctx */*ctx*/);
91 /* --- @md2_set@ --- *
93 * Arguments: @md2_ctx *ctx@ = pointer to context block
94 * @const void *buf@ = pointer to state buffer
95 * @unsigned long count@ = current count of bytes processed
99 * Use: Initializes a context block from a given state. This is
100 * useful in cases where the initial hash state is meant to be
101 * secret, e.g., for NMAC and HMAC support.
104 extern void md2_set(md2_ctx */*ctx*/, const void */*buf*/,
105 unsigned long /*count*/);
107 /* --- @md2_hash@ --- *
109 * Arguments: @md2_ctx *ctx@ = pointer to context block
110 * @const void *buf@ = buffer of data to hash
111 * @size_t sz@ = size of buffer to hash
115 * Use: Hashes a buffer of data. The buffer may be of any size and
119 extern void md2_hash(md2_ctx */*ctx*/, const void */*buf*/, size_t /*sz*/);
121 /* --- @md2_done@ --- *
123 * Arguments: @md2_ctx *ctx@ = pointer to context block
124 * @void *hash@ = pointer to output buffer
128 * Use: Returns the hash of the data read so far.
131 extern void md2_done(md2_ctx */*ctx*/, void */*hash*/);
133 /* --- @md2_state@ --- *
135 * Arguments: @md2_ctx *ctx@ = pointer to context
136 * @void *state@ = pointer to buffer for current state
138 * Returns: Number of bytes written to the hash function so far.
140 * Use: Returns the current state of the hash function such that
141 * it can be passed to @md2_set@.
144 extern unsigned long md2_state(md2_ctx */*ctx*/, void */*state*/);
146 /*----- Generic hash interface --------------------------------------------*/
148 extern const gchash md2;
150 /*----- That's all, folks -------------------------------------------------*/