3 * $Id: rmd160.h,v 1.4 2000/10/15 19:09:20 mdw Exp $
5 * The RIPEMD-160 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 RIPEMD-160 hash function -----------------------------*
50 * RIPEMD-160 was invented by Hans Dobbertin, Antoon Bosselaers and Bart
51 * Preneel. It's a strengthened version of the original RIPEMD hash
52 * function, fixing a vulnerability discovered by Hans Dobbertin. The
53 * RIPEMD-160 design team appears well respected in the cryptographic
54 * community. The author finds them more plausible than SHA-1, which is the
55 * best alternative hash function.
58 #ifndef CATACOMB_RMD160_H
59 #define CATACOMB_RMD160_H
65 /*----- Header files ------------------------------------------------------*/
67 #include <mLib/bits.h>
69 #ifndef CATACOMB_GHASH_H
73 /*----- Magic numbers -----------------------------------------------------*/
75 #define RMD160_BUFSZ 64
76 #define RMD160_HASHSZ 20
77 #define RMD160_STATESZ 20
79 /*----- Data structures ---------------------------------------------------*/
81 typedef struct rmd160_ctx
{
82 uint32 a
, b
, c
, d
, e
; /* Chaining variables */
83 uint32 nl
, nh
; /* Byte count so far */
84 unsigned off
; /* Offset into buffer */
85 octet buf
[RMD160_BUFSZ
]; /* Accumulation buffer */
88 /*----- Functions provided ------------------------------------------------*/
90 /* --- @rmd160_compress@ --- *
92 * Arguments: @rmd160_ctx *ctx@ = pointer to context block
93 * @const void *sbuf@ = pointer to buffer of appropriate size
97 * Use: RIPEMD-160 compression function.
100 extern void rmd160_compress(rmd160_ctx */
*ctx*/
, const void */
*sbuf*/
);
102 /* --- @rmd160_init@ --- *
104 * Arguments: @rmd160_ctx *ctx@ = pointer to context block to initialize
108 * Use: Initializes a context block ready for hashing.
111 extern void rmd160_init(rmd160_ctx */
*ctx*/
);
113 /* --- @rmd160_set@ --- *
115 * Arguments: @rmd160_ctx *ctx@ = pointer to context block
116 * @const void *buf@ = pointer to state buffer
117 * @unsigned long count@ = current count of bytes processed
121 * Use: Initializes a context block from a given state. This is
122 * useful in cases where the initial hash state is meant to be
123 * secret, e.g., for NMAC and HMAC support.
126 extern void rmd160_set(rmd160_ctx */
*ctx*/
,
127 const void */
*buf*/
, unsigned long /*count*/);
129 /* --- @rmd160_hash@ --- *
131 * Arguments: @rmd160_ctx *ctx@ = pointer to context block
132 * @const void *buf@ = buffer of data to hash
133 * @size_t sz@ = size of buffer to hash
137 * Use: Hashes a buffer of data. The buffer may be of any size and
141 extern void rmd160_hash(rmd160_ctx */
*ctx*/
,
142 const void */
*buf*/
, size_t /*sz*/);
144 /* --- @rmd160_done@ --- *
146 * Arguments: @rmd160_ctx *ctx@ = pointer to context block
147 * @void *hash@ = pointer to output buffer
151 * Use: Returns the hash of the data read so far.
154 extern void rmd160_done(rmd160_ctx */
*ctx*/
, void */
*hash*/
);
156 /* --- @rmd160_state@ --- *
158 * Arguments: @rmd160_ctx *ctx@ = pointer to context
159 * @void *state@ = pointer to buffer for current state
161 * Returns: Number of bytes written to the hash function so far.
163 * Use: Returns the current state of the hash function such that
164 * it can be passed to @rmd160_set@.
167 extern unsigned long rmd160_state(rmd160_ctx */
*ctx*/
, void */
*state*/
);
169 /*----- Generic hash interface --------------------------------------------*/
171 extern const gchash rmd160
;
173 /*----- That's all, folks -------------------------------------------------*/