git.distorted.org.uk Git - u/mdw/catacomb/blob - tiger.c

   1 /* -*-c-*-
   2  *
   3  * $Id: tiger.c,v 1.1 2000/07/15 10:02:43 mdw Exp $
   4  *
   5  * The Tiger hash function
   6  *
   7  * (c) 2000 Straylight/Edgeware
   8  */
   9
  10 /*----- Licensing notice --------------------------------------------------*
  11  *
  12  * This file is part of Catacomb.
  13  *
  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.
  18  *
  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.
  23  *
  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,
  27  * MA 02111-1307, USA.
  28  */
  29
  30 /*----- Revision history --------------------------------------------------*
  31  *
  32  * $Log: tiger.c,v $
  33  * Revision 1.1  2000/07/15 10:02:43  mdw
  34  * Anderson and Biham's Tiger hash function added.
  35  *
  36  */
  37
  38 /*----- Header files ------------------------------------------------------*/
  39
  40 #include <mLib/bits.h>
  41
  42 #include "ghash-def.h"
  43 #include "hash.h"
  44 #include "tiger.h"
  45 #include "tiger-tab.h"
  46 #include "tiger-base.h"
  47
  48 /*----- S-boxes -----------------------------------------------------------*/
  49
  50 static const kludge64 s[4][256] = TIGER_S;
  51
  52 /*----- Main code ---------------------------------------------------------*/
  53
  54 /* --- @tiger_compress@ --- *
  55  *
  56  * Arguments:   @tiger_ctx *ctx@ = pointer to context block
  57  *              @const void *sbuf@ = pointer to buffer of appropriate size
  58  *
  59  * Returns:     ---
  60  *
  61  * Use:         Tiger compression function.
  62  */
  63
  64 void tiger_compress(tiger_ctx *ctx, const void *sbuf)
  65 {
  66   kludge64 x[8];
  67   int i;
  68   const octet *p;
  69   for (i = 0, p = sbuf; i < 8; i++, p += 8)
  70     LOAD64_L_(x[i], p);
  71   TIGER_CORE(ctx->a, ctx->b, ctx->c, x);
  72 }
  73
  74 /* --- @tiger_init@ --- *
  75  *
  76  * Arguments:   @tiger_ctx *ctx@ = pointer to context block to initialize
  77  *
  78  * Returns:     ---
  79  *
  80  * Use:         Initializes a context block ready for hashing.
  81  */
  82
  83 void tiger_init(tiger_ctx *ctx)
  84 {
  85   SET64(ctx->a, 0x01234567, 0x89abcdef);
  86   SET64(ctx->b, 0xfedcba98, 0x76543210);
  87   SET64(ctx->c, 0xf096a5b4, 0xc3b2e187);
  88   ctx->off = 0;
  89   ctx->nl = ctx->nh = 0;
  90 }
  91
  92 /* --- @tiger_set@ --- *
  93  *
  94  * Arguments:   @tiger_ctx *ctx@ = pointer to context block
  95  *              @const void *buf@ = pointer to state buffer
  96  *              @unsigned long count@ = current count of bytes processed
  97  *
  98  * Returns:     ---
  99  *
 100  * Use:         Initializes a context block from a given state.  This is
 101  *              useful in cases where the initial hash state is meant to be
 102  *              secret, e.g., for NMAC and HMAC support.
 103  */
 104
 105 void tiger_set(tiger_ctx *ctx, const void *buf, unsigned long count)
 106 {
 107   const octet *p = buf;
 108   LOAD64_L_(ctx->a, p +  0);
 109   LOAD64_L_(ctx->b, p +  8);
 110   LOAD64_L_(ctx->c, p + 16);
 111   ctx->off = 0;
 112   ctx->nl = U32(count);
 113   ctx->nh = U32(((count & ~MASK32) >> 16) >> 16);
 114 }
 115
 116 /* --- @tiger_hash@ --- *
 117  *
 118  * Arguments:   @tiger_ctx *ctx@ = pointer to context block
 119  *              @const void *buf@ = buffer of data to hash
 120  *              @size_t sz@ = size of buffer to hash
 121  *
 122  * Returns:     ---
 123  *
 124  * Use:         Hashes a buffer of data.  The buffer may be of any size and
 125  *              alignment.
 126  */
 127
 128 void tiger_hash(tiger_ctx *ctx, const void *buf, size_t sz)
 129 {
 130   HASH_BUFFER(TIGER, tiger, ctx, buf, sz);
 131 }
 132
 133 /* --- @tiger_done@ --- *
 134  *
 135  * Arguments:   @tiger_ctx *ctx@ = pointer to context block
 136  *              @void *hash@ = pointer to output buffer
 137  *
 138  * Returns:     ---
 139  *
 140  * Use:         Returns the hash of the data read so far.
 141  */
 142
 143 void tiger_done(tiger_ctx *ctx, void *hash)
 144 {
 145   octet *p = hash;
 146   HASH_PAD(TIGER, tiger, ctx, 0x01u, 0, 8);
 147   STORE32_L(ctx->buf + TIGER_BUFSZ - 8, ctx->nl << 3);
 148   STORE32_L(ctx->buf + TIGER_BUFSZ - 4, (ctx->nl >> 29) | (ctx->nh << 3));
 149   tiger_compress(ctx, ctx->buf);
 150   STORE64_L_(p +  0, ctx->a);
 151   STORE64_L_(p +  8, ctx->b);
 152   STORE64_L_(p + 16, ctx->c);
 153 }
 154
 155 /* --- @tiger_state@ --- *
 156  *
 157  * Arguments:   @tiger_ctx *ctx@ = pointer to context
 158  *              @void *state@ = pointer to buffer for current state
 159  *
 160  * Returns:     Number of bytes written to the hash function so far.
 161  *
 162  * Use:         Returns the current state of the hash function such that
 163  *              it can be passed to @tiger_set@.
 164  */
 165
 166 unsigned long tiger_state(tiger_ctx *ctx, void *state)
 167 {
 168   octet *p = state;
 169   STORE64_L_(p +  0, ctx->a);
 170   STORE64_L_(p +  8, ctx->b);
 171   STORE64_L_(p + 16, ctx->c);
 172   return (ctx->nl | ((ctx->nh << 16) << 16));
 173 }
 174
 175 /* --- Generic interface --- */
 176
 177 GHASH_DEF(TIGER, tiger)
 178
 179 /* --- Test code --- */
 180
 181 HASH_TEST(TIGER, tiger)
 182
 183 /*----- That's all, folks -------------------------------------------------*/