3 * $Id: rmd256.h,v 1.1 2000/07/09 21:30:31 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 1.1 2000/07/09 21:30:31 mdw
34 * New RIPEMD variants.
38 /*----- Notes on the RIPEMD-256 hash function -----------------------------*
40 * RIPEMD-256 was invented by Hans Dobbertin, Antoon Bosselaers and Bart
41 * Preneel. It's a double-width version of RIPEMD-128, constructed simply by
42 * not gluing together the two parallel computations which RIPEMD-128 usually
43 * does in its compression function. The authors warn that, while its output
44 * is twice as wide as that of RIPEMD-128, they don't expect it to offer any
48 #ifndef CATACOMB_RMD256_H
49 #define CATACOMB_RMD256_H
55 /*----- Header files ------------------------------------------------------*/
57 #include <mLib/bits.h>
59 #ifndef CATACOMB_GHASH_H
63 /*----- Magic numbers -----------------------------------------------------*/
65 #define RMD256_BUFSZ 64
66 #define RMD256_HASHSZ 32
68 /*----- Data structures ---------------------------------------------------*/
70 typedef struct rmd256_ctx
{
71 uint32 a
, b
, c
, d
; /* Chaining variables */
72 uint32 A
, B
, C
, D
; /* More chaining variables */
73 uint32 nl
, nh
; /* Byte count so far */
74 unsigned off
; /* Offset into buffer */
75 octet buf
[RMD256_BUFSZ
]; /* Accumulation buffer */
78 /*----- Functions provided ------------------------------------------------*/
80 /* --- @rmd256_compress@ --- *
82 * Arguments: @rmd256_ctx *ctx@ = pointer to context block
83 * @const void *sbuf@ = pointer to buffer of appropriate size
87 * Use: RIPEMD-256 compression function.
90 extern void rmd256_compress(rmd256_ctx */
*ctx*/
, const void */
*sbuf*/
);
92 /* --- @rmd256_init@ --- *
94 * Arguments: @rmd256_ctx *ctx@ = pointer to context block to initialize
98 * Use: Initializes a context block ready for hashing.
101 extern void rmd256_init(rmd256_ctx */
*ctx*/
);
103 /* --- @rmd256_set@ --- *
105 * Arguments: @rmd256_ctx *ctx@ = pointer to context block
106 * @const void *buf@ = pointer to state buffer
107 * @unsigned long count@ = current count of bytes processed
111 * Use: Initializes a context block from a given state. This is
112 * useful in cases where the initial hash state is meant to be
113 * secret, e.g., for NMAC and HMAC support.
116 extern void rmd256_set(rmd256_ctx */
*ctx*/
,
117 const void */
*buf*/
, unsigned long /*count*/);
119 /* --- @rmd256_hash@ --- *
121 * Arguments: @rmd256_ctx *ctx@ = pointer to context block
122 * @const void *buf@ = buffer of data to hash
123 * @size_t sz@ = size of buffer to hash
127 * Use: Hashes a buffer of data. The buffer may be of any size and
131 extern void rmd256_hash(rmd256_ctx */
*ctx*/
,
132 const void */
*buf*/
, size_t /*sz*/);
134 /* --- @rmd256_done@ --- *
136 * Arguments: @rmd256_ctx *ctx@ = pointer to context block
137 * @void *hash@ = pointer to output buffer
141 * Use: Returns the hash of the data read so far.
144 extern void rmd256_done(rmd256_ctx */
*ctx*/
, void */
*hash*/
);
146 /* --- @rmd256_state@ --- *
148 * Arguments: @rmd256_ctx *ctx@ = pointer to context
149 * @void *state@ = pointer to buffer for current state
151 * Returns: Number of bytes written to the hash function so far.
153 * Use: Returns the current state of the hash function such that
154 * it can be passed to @rmd256_set@.
157 extern unsigned long rmd256_state(rmd256_ctx */
*ctx*/
, void */
*state*/
);
159 /*----- Generic hash interface --------------------------------------------*/
161 extern const gchash rmd256
;
163 /*----- That's all, folks -------------------------------------------------*/