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   1 /* -*-c-*-
   2  *
   3  * $Id: tiger.c,v 1.2 2004/04/08 01:36:15 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 /*----- Header files ------------------------------------------------------*/
  31
  32 #include <mLib/bits.h>
  33
  34 #include "ghash-def.h"
  35 #include "hash.h"
  36 #include "tiger.h"
  37 #include "tiger-tab.h"
  38 #include "tiger-base.h"
  39
  40 /*----- S-boxes -----------------------------------------------------------*/
  41
  42 static const kludge64 s[4][256] = TIGER_S;
  43
  44 /*----- Main code ---------------------------------------------------------*/
  45
  46 /* --- @tiger_compress@ --- *
  47  *
  48  * Arguments:   @tiger_ctx *ctx@ = pointer to context block
  49  *              @const void *sbuf@ = pointer to buffer of appropriate size
  50  *
  51  * Returns:     ---
  52  *
  53  * Use:         Tiger compression function.
  54  */
  55
  56 void tiger_compress(tiger_ctx *ctx, const void *sbuf)
  57 {
  58   kludge64 x[8];
  59   int i;
  60   const octet *p;
  61   for (i = 0, p = sbuf; i < 8; i++, p += 8)
  62     LOAD64_L_(x[i], p);
  63   TIGER_CORE(ctx->a, ctx->b, ctx->c, x);
  64 }
  65
  66 /* --- @tiger_init@ --- *
  67  *
  68  * Arguments:   @tiger_ctx *ctx@ = pointer to context block to initialize
  69  *
  70  * Returns:     ---
  71  *
  72  * Use:         Initializes a context block ready for hashing.
  73  */
  74
  75 void tiger_init(tiger_ctx *ctx)
  76 {
  77   SET64(ctx->a, 0x01234567, 0x89abcdef);
  78   SET64(ctx->b, 0xfedcba98, 0x76543210);
  79   SET64(ctx->c, 0xf096a5b4, 0xc3b2e187);
  80   ctx->off = 0;
  81   ctx->nl = ctx->nh = 0;
  82 }
  83
  84 /* --- @tiger_set@ --- *
  85  *
  86  * Arguments:   @tiger_ctx *ctx@ = pointer to context block
  87  *              @const void *buf@ = pointer to state buffer
  88  *              @unsigned long count@ = current count of bytes processed
  89  *
  90  * Returns:     ---
  91  *
  92  * Use:         Initializes a context block from a given state.  This is
  93  *              useful in cases where the initial hash state is meant to be
  94  *              secret, e.g., for NMAC and HMAC support.
  95  */
  96
  97 void tiger_set(tiger_ctx *ctx, const void *buf, unsigned long count)
  98 {
  99   const octet *p = buf;
 100   LOAD64_L_(ctx->a, p +  0);
 101   LOAD64_L_(ctx->b, p +  8);
 102   LOAD64_L_(ctx->c, p + 16);
 103   ctx->off = 0;
 104   ctx->nl = U32(count);
 105   ctx->nh = U32(((count & ~MASK32) >> 16) >> 16);
 106 }
 107
 108 /* --- @tiger_hash@ --- *
 109  *
 110  * Arguments:   @tiger_ctx *ctx@ = pointer to context block
 111  *              @const void *buf@ = buffer of data to hash
 112  *              @size_t sz@ = size of buffer to hash
 113  *
 114  * Returns:     ---
 115  *
 116  * Use:         Hashes a buffer of data.  The buffer may be of any size and
 117  *              alignment.
 118  */
 119
 120 void tiger_hash(tiger_ctx *ctx, const void *buf, size_t sz)
 121 {
 122   HASH_BUFFER(TIGER, tiger, ctx, buf, sz);
 123 }
 124
 125 /* --- @tiger_done@ --- *
 126  *
 127  * Arguments:   @tiger_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 void tiger_done(tiger_ctx *ctx, void *hash)
 136 {
 137   octet *p = hash;
 138   HASH_PAD(TIGER, tiger, ctx, 0x01u, 0, 8);
 139   STORE32_L(ctx->buf + TIGER_BUFSZ - 8, ctx->nl << 3);
 140   STORE32_L(ctx->buf + TIGER_BUFSZ - 4, (ctx->nl >> 29) | (ctx->nh << 3));
 141   tiger_compress(ctx, ctx->buf);
 142   STORE64_L_(p +  0, ctx->a);
 143   STORE64_L_(p +  8, ctx->b);
 144   STORE64_L_(p + 16, ctx->c);
 145 }
 146
 147 /* --- @tiger_state@ --- *
 148  *
 149  * Arguments:   @tiger_ctx *ctx@ = pointer to context
 150  *              @void *state@ = pointer to buffer for current state
 151  *
 152  * Returns:     Number of bytes written to the hash function so far.
 153  *
 154  * Use:         Returns the current state of the hash function such that
 155  *              it can be passed to @tiger_set@.
 156  */
 157
 158 unsigned long tiger_state(tiger_ctx *ctx, void *state)
 159 {
 160   octet *p = state;
 161   STORE64_L_(p +  0, ctx->a);
 162   STORE64_L_(p +  8, ctx->b);
 163   STORE64_L_(p + 16, ctx->c);
 164   return (ctx->nl | ((ctx->nh << 16) << 16));
 165 }
 166
 167 /* --- Generic interface --- */
 168
 169 GHASH_DEF(TIGER, tiger)
 170
 171 /* --- Test code --- */
 172
 173 HASH_TEST(TIGER, tiger)
 174
 175 /*----- That's all, folks -------------------------------------------------*/