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   1 /* -*-c-*-
   2  *
   3  * $Id: ghash-def.h,v 1.3 2000/07/02 18:27:42 mdw Exp $
   4  *
   5  * Definitions for generic hash interface
   6  *
   7  * (c) 1999 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: ghash-def.h,v $
  33  * Revision 1.3  2000/07/02 18:27:42  mdw
  34  * (ghash->ops->done): Interface change.  Passing in a null buffer pointer
  35  * uses a buffer internal to the ghash object.  The operation returns the
  36  * address of the buffer it used.  Clients of generic hashes no longer need
  37  * to use dynamically allocated memory for hash results.
  38  *
  39  * Revision 1.2  2000/06/17 11:22:03  mdw
  40  * Use secure arena for memory allocation.  Minor changes in the generic
  41  * hash interface.
  42  *
  43  * Revision 1.1  1999/12/10 23:21:37  mdw
  44  * Generic interface.
  45  *
  46  */
  47
  48 #ifndef CATACOMB_GHASH_DEF_H
  49 #define CATACOMB_GHASH_DEF_H
  50
  51 #ifdef __cplusplus
  52   extern "C" {
  53 #endif
  54
  55 /*----- Header files ------------------------------------------------------*/
  56
  57 #include <mLib/bits.h>
  58 #include <mLib/sub.h>
  59
  60 #ifndef CATACOMB_ARENA_H
  61 #  include "arena.h"
  62 #endif
  63
  64 #ifndef CATACOMB_GHASH_H
  65 #  include "ghash.h"
  66 #endif
  67
  68 /*----- Generic hash function interface -----------------------------------*/
  69
  70 /* --- @GHASH_DEF@ --- *
  71  *
  72  * Arguments:   @PRE, pre@ = prefixes for hash function
  73  *
  74  * Use:         Defines the generic hash instance.
  75  */
  76
  77 #define GHASH_DEF(PRE, pre)                                             \
  78                                                                         \
  79 static const ghash_ops gops;                                            \
  80                                                                         \
  81 typedef struct gctx {                                                   \
  82   ghash h;                                                              \
  83   pre##_ctx c;                                                          \
  84   octet buf[PRE##_HASHSZ];                                              \
  85 } gctx;                                                                 \
  86                                                                         \
  87 static ghash *ghinit(void)                                              \
  88 {                                                                       \
  89   gctx *g = S_CREATE(gctx);                                             \
  90   g->h.ops = &gops;                                                     \
  91   pre##_init(&g->c);                                                    \
  92   return (&g->h);                                                       \
  93 }                                                                       \
  94                                                                         \
  95 static void ghhash(ghash *h, const void *p, size_t sz)                  \
  96 {                                                                       \
  97   gctx *g = (gctx *)h;                                                  \
  98   pre##_hash(&g->c, p, sz);                                             \
  99 }                                                                       \
 100                                                                         \
 101 static octet *ghdone(ghash *h, void *buf)                               \
 102 {                                                                       \
 103   gctx *g = (gctx *)h;                                                  \
 104   if (!buf)                                                             \
 105     buf = g->buf;                                                       \
 106   pre##_done(&g->c, buf);                                               \
 107   return (buf);                                                         \
 108 }                                                                       \
 109                                                                         \
 110 static void ghdestroy(ghash *h)                                         \
 111 {                                                                       \
 112   gctx *g = (gctx *)h;                                                  \
 113   S_DESTROY(g);                                                         \
 114 }                                                                       \
 115                                                                         \
 116 static const ghash_ops gops = { &pre, ghhash, ghdone, ghdestroy };      \
 117 const gchash pre = { #pre, PRE##_HASHSZ, ghinit };
 118
 119 /*----- That's all, folks -------------------------------------------------*/
 120
 121 #ifdef __cplusplus
 122   }
 123 #endif
 124
 125 #endif