chiark - git - mdw - catacomb/blob - symm/ghash-def.h

   1 /* -*-c-*-
   2  *
   3  * Definitions for generic hash interface
   4  *
   5  * (c) 1999 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 #ifndef CATACOMB_GHASH_DEF_H
  29 #define CATACOMB_GHASH_DEF_H
  30
  31 #ifdef __cplusplus
  32   extern "C" {
  33 #endif
  34
  35 /*----- Header files ------------------------------------------------------*/
  36
  37 #include <mLib/bits.h>
  38 #include <mLib/sub.h>
  39
  40 #ifndef CATACOMB_ARENA_H
  41 #  include "arena.h"
  42 #endif
  43
  44 #ifndef CATACOMB_GHASH_H
  45 #  include "ghash.h"
  46 #endif
  47
  48 #ifndef CATACOMB_PARANOIA_H
  49 #  include "paranoia.h"
  50 #endif
  51
  52 /*----- Generic hash function interface -----------------------------------*/
  53
  54 /* --- @GHASH_DEF@ --- *
  55  *
  56  * Arguments:   @PRE, pre@ = prefixes for hash function
  57  *
  58  * Use:         Defines the generic hash instance.
  59  */
  60
  61 #define GHASH_DEF(PRE, pre)                                             \
  62                                                                         \
  63 static const ghash_ops gops;                                            \
  64                                                                         \
  65 typedef struct gctx {                                                   \
  66   ghash h;                                                              \
  67   pre##_ctx c;                                                          \
  68   octet buf[PRE##_HASHSZ];                                              \
  69 } gctx;                                                                 \
  70                                                                         \
  71 static ghash *ghinit(void)                                              \
  72 {                                                                       \
  73   gctx *g = S_CREATE(gctx);                                             \
  74   g->h.ops = &gops;                                                     \
  75   pre##_init(&g->c);                                                    \
  76   return (&g->h);                                                       \
  77 }                                                                       \
  78                                                                         \
  79 static void ghhash(ghash *h, const void *p, size_t sz)                  \
  80 {                                                                       \
  81   gctx *g = (gctx *)h;                                                  \
  82   pre##_hash(&g->c, p, sz);                                             \
  83 }                                                                       \
  84                                                                         \
  85 static octet *ghdone(ghash *h, void *buf)                               \
  86 {                                                                       \
  87   gctx *g = (gctx *)h;                                                  \
  88   if (!buf)                                                             \
  89     buf = g->buf;                                                       \
  90   pre##_done(&g->c, buf);                                               \
  91   return (buf);                                                         \
  92 }                                                                       \
  93                                                                         \
  94 static void ghdestroy(ghash *h)                                         \
  95 {                                                                       \
  96   gctx *g = (gctx *)h;                                                  \
  97   BURN(*g);                                                             \
  98   S_DESTROY(g);                                                         \
  99 }                                                                       \
 100                                                                         \
 101 static ghash *ghcopy(ghash *h)                                          \
 102 {                                                                       \
 103   gctx *g = (gctx *)h;                                                  \
 104   gctx *gg = S_CREATE(gctx);                                            \
 105   memcpy(gg, g, sizeof(gctx));                                          \
 106   return (&gg->h);                                                      \
 107 }                                                                       \
 108                                                                         \
 109 static const ghash_ops gops =                                           \
 110   { &pre, ghhash, ghdone, ghdestroy, ghcopy };                          \
 111 const gchash pre = { #pre, PRE##_HASHSZ, ghinit, PRE##_BUFSZ };
 112
 113 /*----- That's all, folks -------------------------------------------------*/
 114
 115 #ifdef __cplusplus
 116   }
 117 #endif
 118
 119 #endif