git.distorted.org.uk Git - u/mdw/catacomb/blob - symm/rmd320.h

   1 /* -*-c-*-
   2  *
   3  * The RIPEMD-320 message digest function
   4  *
   5  * (c) 1998 Straylight/Edgeware
   6  */
   7
   8 /*----- Licensing notice --------------------------------------------------*
   9  *
  10  * This file is part of Catacomb.
  11  *
  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.
  16  *
  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.
  21  *
  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,
  25  * MA 02111-1307, USA.
  26  */
  27
  28 /*----- Notes on the RIPEMD-320 hash function -----------------------------*
  29  *
  30  * RIPEMD-320 was invented by Hans Dobbertin, Antoon Bosselaers and Bart
  31  * Preneel.  It's a double-width version of RIPEMD-160, constructed simply by
  32  * not gluing together the two parallel computations which RIPEMD-160 usually
  33  * does in its compression function.  The authors warn that, while its output
  34  * is twice as wide as that of RIPEMD-160, they don't expect it to offer any
  35  * more security.
  36  */
  37
  38 #ifndef CATACOMB_RMD320_H
  39 #define CATACOMB_RMD320_H
  40
  41 #ifdef __cplusplus
  42   extern "C" {
  43 #endif
  44
  45 /*----- Header files ------------------------------------------------------*/
  46
  47 #include <mLib/bits.h>
  48
  49 #ifndef CATACOMB_GHASH_H
  50 #  include "ghash.h"
  51 #endif
  52
  53 /*----- Magic numbers -----------------------------------------------------*/
  54
  55 #define RMD320_BUFSZ 64
  56 #define RMD320_HASHSZ 40
  57 #define RMD320_STATESZ 40
  58
  59 /*----- Data structures ---------------------------------------------------*/
  60
  61 typedef struct rmd320_ctx {
  62   uint32 a, b, c, d, e;                 /* Chaining variables */
  63   uint32 A, B, C, D, E;                 /* More chaining variables */
  64   uint32 nl, nh;                        /* Byte count so far */
  65   unsigned off;                         /* Offset into buffer */
  66   octet buf[RMD320_BUFSZ];              /* Accumulation buffer */
  67 } rmd320_ctx;
  68
  69 /*----- Functions provided ------------------------------------------------*/
  70
  71 /* --- @rmd320_compress@ --- *
  72  *
  73  * Arguments:   @rmd320_ctx *ctx@ = pointer to context block
  74  *              @const void *sbuf@ = pointer to buffer of appropriate size
  75  *
  76  * Returns:     ---
  77  *
  78  * Use:         RIPEMD-320 compression function.
  79  */
  80
  81 extern void rmd320_compress(rmd320_ctx */*ctx*/, const void */*sbuf*/);
  82
  83 /* --- @rmd320_init@ --- *
  84  *
  85  * Arguments:   @rmd320_ctx *ctx@ = pointer to context block to initialize
  86  *
  87  * Returns:     ---
  88  *
  89  * Use:         Initializes a context block ready for hashing.
  90  */
  91
  92 extern void rmd320_init(rmd320_ctx */*ctx*/);
  93
  94 /* --- @rmd320_set@ --- *
  95  *
  96  * Arguments:   @rmd320_ctx *ctx@ = pointer to context block
  97  *              @const void *buf@ = pointer to state buffer
  98  *              @unsigned long count@ = current count of bytes processed
  99  *
 100  * Returns:     ---
 101  *
 102  * Use:         Initializes a context block from a given state.  This is
 103  *              useful in cases where the initial hash state is meant to be
 104  *              secret, e.g., for NMAC and HMAC support.
 105  */
 106
 107 extern void rmd320_set(rmd320_ctx */*ctx*/,
 108                        const void */*buf*/, unsigned long /*count*/);
 109
 110 /* --- @rmd320_hash@ --- *
 111  *
 112  * Arguments:   @rmd320_ctx *ctx@ = pointer to context block
 113  *              @const void *buf@ = buffer of data to hash
 114  *              @size_t sz@ = size of buffer to hash
 115  *
 116  * Returns:     ---
 117  *
 118  * Use:         Hashes a buffer of data.  The buffer may be of any size and
 119  *              alignment.
 120  */
 121
 122 extern void rmd320_hash(rmd320_ctx */*ctx*/,
 123                         const void */*buf*/, size_t /*sz*/);
 124
 125 /* --- @rmd320_done@ --- *
 126  *
 127  * Arguments:   @rmd320_ctx *ctx@ = pointer to context block
 128  *              @void *hash@ = pointer to output buffer
 129  *
 130  * Returns:     ---
 131  *
 132  * Use:         Returns the hash of the data read so far.
 133  */
 134
 135 extern void rmd320_done(rmd320_ctx */*ctx*/, void */*hash*/);
 136
 137 /* --- @rmd320_state@ --- *
 138  *
 139  * Arguments:   @rmd320_ctx *ctx@ = pointer to context
 140  *              @void *state@ = pointer to buffer for current state
 141  *
 142  * Returns:     Number of bytes written to the hash function so far.
 143  *
 144  * Use:         Returns the current state of the hash function such that
 145  *              it can be passed to @rmd320_set@.
 146  */
 147
 148 extern unsigned long rmd320_state(rmd320_ctx */*ctx*/, void */*state*/);
 149
 150 /*----- Generic hash interface --------------------------------------------*/
 151
 152 extern const gchash rmd320;
 153
 154 /*----- That's all, folks -------------------------------------------------*/
 155
 156 #ifdef __cplusplus
 157   }
 158 #endif
 159
 160 #endif