git.distorted.org.uk Git - u/mdw/catacomb/blob - symm/rmd128.h

   1 /* -*-c-*-
   2  *
   3  * The RIPEMD-128 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-128 hash function -----------------------------*
  29  *
  30  * RIPEMD-128 was invented by Hans Dobbertin, Antoon Bosselaers and Bart
  31  * Preneel, as a drop-in replacement for MD5 (with the same sized output).
  32  * It's a cut-down version of RIPEMD-160, which should be used in preference.
  33  */
  34
  35 #ifndef CATACOMB_RMD128_H
  36 #define CATACOMB_RMD128_H
  37
  38 #ifdef __cplusplus
  39   extern "C" {
  40 #endif
  41
  42 /*----- Header files ------------------------------------------------------*/
  43
  44 #include <mLib/bits.h>
  45
  46 #ifndef CATACOMB_GHASH_H
  47 #  include "ghash.h"
  48 #endif
  49
  50 /*----- Magic numbers -----------------------------------------------------*/
  51
  52 #define RMD128_BUFSZ 64
  53 #define RMD128_HASHSZ 16
  54 #define RMD128_STATESZ 16
  55
  56 /*----- Data structures ---------------------------------------------------*/
  57
  58 typedef struct rmd128_ctx {
  59   uint32 a, b, c, d;                    /* Chaining variables */
  60   uint32 nl, nh;                        /* Byte count so far */
  61   unsigned off;                         /* Offset into buffer */
  62   octet buf[RMD128_BUFSZ];              /* Accumulation buffer */
  63 } rmd128_ctx;
  64
  65 /*----- Functions provided ------------------------------------------------*/
  66
  67 /* --- @rmd128_compress@ --- *
  68  *
  69  * Arguments:   @rmd128_ctx *ctx@ = pointer to context block
  70  *              @const void *sbuf@ = pointer to buffer of appropriate size
  71  *
  72  * Returns:     ---
  73  *
  74  * Use:         RIPEMD-128 compression function.
  75  */
  76
  77 extern void rmd128_compress(rmd128_ctx */*ctx*/, const void */*sbuf*/);
  78
  79 /* --- @rmd128_init@ --- *
  80  *
  81  * Arguments:   @rmd128_ctx *ctx@ = pointer to context block to initialize
  82  *
  83  * Returns:     ---
  84  *
  85  * Use:         Initializes a context block ready for hashing.
  86  */
  87
  88 extern void rmd128_init(rmd128_ctx */*ctx*/);
  89
  90 /* --- @rmd128_set@ --- *
  91  *
  92  * Arguments:   @rmd128_ctx *ctx@ = pointer to context block
  93  *              @const void *buf@ = pointer to state buffer
  94  *              @unsigned long count@ = current count of bytes processed
  95  *
  96  * Returns:     ---
  97  *
  98  * Use:         Initializes a context block from a given state.  This is
  99  *              useful in cases where the initial hash state is meant to be
 100  *              secret, e.g., for NMAC and HMAC support.
 101  */
 102
 103 extern void rmd128_set(rmd128_ctx */*ctx*/,
 104                        const void */*buf*/, unsigned long /*count*/);
 105
 106 /* --- @rmd128_hash@ --- *
 107  *
 108  * Arguments:   @rmd128_ctx *ctx@ = pointer to context block
 109  *              @const void *buf@ = buffer of data to hash
 110  *              @size_t sz@ = size of buffer to hash
 111  *
 112  * Returns:     ---
 113  *
 114  * Use:         Hashes a buffer of data.  The buffer may be of any size and
 115  *              alignment.
 116  */
 117
 118 extern void rmd128_hash(rmd128_ctx */*ctx*/,
 119                         const void */*buf*/, size_t /*sz*/);
 120
 121 /* --- @rmd128_done@ --- *
 122  *
 123  * Arguments:   @rmd128_ctx *ctx@ = pointer to context block
 124  *              @void *hash@ = pointer to output buffer
 125  *
 126  * Returns:     ---
 127  *
 128  * Use:         Returns the hash of the data read so far.
 129  */
 130
 131 extern void rmd128_done(rmd128_ctx */*ctx*/, void */*hash*/);
 132
 133 /* --- @rmd128_state@ --- *
 134  *
 135  * Arguments:   @rmd128_ctx *ctx@ = pointer to context
 136  *              @void *state@ = pointer to buffer for current state
 137  *
 138  * Returns:     Number of bytes written to the hash function so far.
 139  *
 140  * Use:         Returns the current state of the hash function such that
 141  *              it can be passed to @rmd128_set@.
 142  */
 143
 144 extern unsigned long rmd128_state(rmd128_ctx */*ctx*/, void */*state*/);
 145
 146 /*----- Generic hash interface --------------------------------------------*/
 147
 148 extern const gchash rmd128;
 149
 150 /*----- That's all, folks -------------------------------------------------*/
 151
 152 #ifdef __cplusplus
 153   }
 154 #endif
 155
 156 #endif