3 * $Id: rmd256.h,v 1.2 2000/10/15 19:09:20 mdw Exp $
5 * The RIPEMD-256 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 1.2 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 1.1 2000/07/09 21:30:31 mdw
38 * New RIPEMD variants.
42 /*----- Notes on the RIPEMD-256 hash function -----------------------------*
44 * RIPEMD-256 was invented by Hans Dobbertin, Antoon Bosselaers and Bart
45 * Preneel. It's a double-width version of RIPEMD-128, constructed simply by
46 * not gluing together the two parallel computations which RIPEMD-128 usually
47 * does in its compression function. The authors warn that, while its output
48 * is twice as wide as that of RIPEMD-128, they don't expect it to offer any
52 #ifndef CATACOMB_RMD256_H
53 #define CATACOMB_RMD256_H
59 /*----- Header files ------------------------------------------------------*/
61 #include <mLib/bits.h>
63 #ifndef CATACOMB_GHASH_H
67 /*----- Magic numbers -----------------------------------------------------*/
69 #define RMD256_BUFSZ 64
70 #define RMD256_HASHSZ 32
71 #define RMD256_STATESZ 32
73 /*----- Data structures ---------------------------------------------------*/
75 typedef struct rmd256_ctx
{
76 uint32 a
, b
, c
, d
; /* Chaining variables */
77 uint32 A
, B
, C
, D
; /* More chaining variables */
78 uint32 nl
, nh
; /* Byte count so far */
79 unsigned off
; /* Offset into buffer */
80 octet buf
[RMD256_BUFSZ
]; /* Accumulation buffer */
83 /*----- Functions provided ------------------------------------------------*/
85 /* --- @rmd256_compress@ --- *
87 * Arguments: @rmd256_ctx *ctx@ = pointer to context block
88 * @const void *sbuf@ = pointer to buffer of appropriate size
92 * Use: RIPEMD-256 compression function.
95 extern void rmd256_compress(rmd256_ctx */
*ctx*/
, const void */
*sbuf*/
);
97 /* --- @rmd256_init@ --- *
99 * Arguments: @rmd256_ctx *ctx@ = pointer to context block to initialize
103 * Use: Initializes a context block ready for hashing.
106 extern void rmd256_init(rmd256_ctx */
*ctx*/
);
108 /* --- @rmd256_set@ --- *
110 * Arguments: @rmd256_ctx *ctx@ = pointer to context block
111 * @const void *buf@ = pointer to state buffer
112 * @unsigned long count@ = current count of bytes processed
116 * Use: Initializes a context block from a given state. This is
117 * useful in cases where the initial hash state is meant to be
118 * secret, e.g., for NMAC and HMAC support.
121 extern void rmd256_set(rmd256_ctx */
*ctx*/
,
122 const void */
*buf*/
, unsigned long /*count*/);
124 /* --- @rmd256_hash@ --- *
126 * Arguments: @rmd256_ctx *ctx@ = pointer to context block
127 * @const void *buf@ = buffer of data to hash
128 * @size_t sz@ = size of buffer to hash
132 * Use: Hashes a buffer of data. The buffer may be of any size and
136 extern void rmd256_hash(rmd256_ctx */
*ctx*/
,
137 const void */
*buf*/
, size_t /*sz*/);
139 /* --- @rmd256_done@ --- *
141 * Arguments: @rmd256_ctx *ctx@ = pointer to context block
142 * @void *hash@ = pointer to output buffer
146 * Use: Returns the hash of the data read so far.
149 extern void rmd256_done(rmd256_ctx */
*ctx*/
, void */
*hash*/
);
151 /* --- @rmd256_state@ --- *
153 * Arguments: @rmd256_ctx *ctx@ = pointer to context
154 * @void *state@ = pointer to buffer for current state
156 * Returns: Number of bytes written to the hash function so far.
158 * Use: Returns the current state of the hash function such that
159 * it can be passed to @rmd256_set@.
162 extern unsigned long rmd256_state(rmd256_ctx */
*ctx*/
, void */
*state*/
);
164 /*----- Generic hash interface --------------------------------------------*/
166 extern const gchash rmd256
;
168 /*----- That's all, folks -------------------------------------------------*/