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

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