git.distorted.org.uk Git - u/mdw/catacomb/blob - symm/has160.h

   1 /* -*-c-*-
   2  *
   3  * The HAS160 message digest function
   4  *
   5  * (c) 2004 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 HAS160 hash function ---------------------------------*
  29  *
  30  * HAS160 was designed by Chae Hoon Lim and the Korean Information Security
  31  * Agency (KISA).  It's recommended for use with KCDSA (though I think I'm
  32  * happer with RIPEMD-160 or SHA1).  It's here so I can check KCDSA test
  33  * vectors.
  34  */
  35
  36 #ifndef CATACOMB_HAS160_H
  37 #define CATACOMB_HAS160_H
  38
  39 #ifdef __cplusplus
  40   extern "C" {
  41 #endif
  42
  43 /*----- Header files ------------------------------------------------------*/
  44
  45 #include <mLib/bits.h>
  46
  47 #ifndef CATACOMB_GHASH_H
  48 #  include "ghash.h"
  49 #endif
  50
  51 /*----- Magic numbers -----------------------------------------------------*/
  52
  53 #define HAS160_BUFSZ 64
  54 #define HAS160_HASHSZ 20
  55 #define HAS160_STATESZ 20
  56
  57 /*----- Data structures ---------------------------------------------------*/
  58
  59 typedef struct has160_ctx {
  60   uint32 a, b, c, d, e;                 /* Chaining variables */
  61   uint32 nl, nh;                        /* Byte count so far */
  62   unsigned off;                         /* Offset into buffer */
  63   octet buf[HAS160_BUFSZ];              /* Accumulation buffer */
  64 } has160_ctx;
  65
  66 /*----- Functions provided ------------------------------------------------*/
  67
  68 /* --- @has160_compress@ --- *
  69  *
  70  * Arguments:   @has160_ctx *ctx@ = pointer to context block
  71  *              @const void *sbuf@ = pointer to buffer of appropriate size
  72  *
  73  * Returns:     ---
  74  *
  75  * Use:         HAS160 compression function.
  76  */
  77
  78 extern void has160_compress(has160_ctx */*ctx*/, const void */*sbuf*/);
  79
  80 /* --- @has160_init@ --- *
  81  *
  82  * Arguments:   @has160_ctx *ctx@ = pointer to context block to initialize
  83  *
  84  * Returns:     ---
  85  *
  86  * Use:         Initializes a context block ready for hashing.
  87  */
  88
  89 extern void has160_init(has160_ctx */*ctx*/);
  90
  91 /* --- @has160_set@ --- *
  92  *
  93  * Arguments:   @has160_ctx *ctx@ = pointer to context block
  94  *              @const void *buf@ = pointer to state buffer
  95  *              @unsigned long count@ = current count of bytes processed
  96  *
  97  * Returns:     ---
  98  *
  99  * Use:         Initializes a context block from a given state.  This is
 100  *              useful in cases where the initial hash state is meant to be
 101  *              secret, e.g., for NMAC and HMAC support.
 102  */
 103
 104 extern void has160_set(has160_ctx */*ctx*/, const void */*buf*/,
 105                        unsigned long /*count*/);
 106
 107 /* --- @has160_hash@ --- *
 108  *
 109  * Arguments:   @has160_ctx *ctx@ = pointer to context block
 110  *              @const void *buf@ = buffer of data to hash
 111  *              @size_t sz@ = size of buffer to hash
 112  *
 113  * Returns:     ---
 114  *
 115  * Use:         Hashes a buffer of data.  The buffer may be of any size and
 116  *              alignment.
 117  */
 118
 119 extern void has160_hash(has160_ctx */*ctx*/,
 120                         const void */*buf*/, size_t /*sz*/);
 121
 122 /* --- @has160_done@ --- *
 123  *
 124  * Arguments:   @has160_ctx *ctx@ = pointer to context block
 125  *              @void *hash@ = pointer to output buffer
 126  *
 127  * Returns:     ---
 128  *
 129  * Use:         Returns the hash of the data read so far.
 130  */
 131
 132 extern void has160_done(has160_ctx */*ctx*/, void */*hash*/);
 133
 134 /* --- @has160_state@ --- *
 135  *
 136  * Arguments:   @has160_ctx *ctx@ = pointer to context
 137  *              @void *state@ = pointer to buffer for current state
 138  *
 139  * Returns:     Number of bytes written to the hash function so far.
 140  *
 141  * Use:         Returns the current state of the hash function such that
 142  *              it can be passed to @has160_set@.
 143  */
 144
 145 extern unsigned long has160_state(has160_ctx */*ctx*/, void */*state*/);
 146
 147 /*----- Generic hash interface --------------------------------------------*/
 148
 149 extern const gchash has160;
 150
 151 /*----- That's all, folks -------------------------------------------------*/
 152
 153 #ifdef __cplusplus
 154   }
 155 #endif
 156
 157 #endif