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   1 /* -*-c-*-
   2  *
   3  * $Id: ghash.h,v 1.3 2000/07/02 18:27:42 mdw Exp $
   4  *
   5  * Generic hash function 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.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 11:22:17  mdw
  40  * Minor changes in the generic hash interface.
  41  *
  42  * Revision 1.1  1999/12/10 23:16:01  mdw
  43  * Generic interface.
  44  *
  45  */
  46
  47 #ifndef CATACOMB_GHASH_H
  48 #define CATACOMB_GHASH_H
  49
  50 #ifdef __cplusplus
  51   extern "C" {
  52 #endif
  53
  54 /*----- Header files ------------------------------------------------------*/
  55
  56 #include <stddef.h>
  57
  58 /*----- Generic hash function interface -----------------------------------*/
  59
  60 typedef struct ghash {
  61   const struct ghash_ops *ops;          /* Pointer to hash operations */
  62 } ghash;
  63
  64 typedef struct ghash_ops {
  65   const struct gchash *c;               /* Pointer to hash class */
  66   void (*hash)(ghash */*h*/, const void */*p*/, size_t /*sz*/); /* Hash */
  67   octet *(*done)(ghash */*h*/, void */*buf*/); /* Write result */
  68   void (*destroy)(ghash */*h*/);        /* Destroy hash block */
  69 } ghash_ops;
  70
  71 typedef struct gchash {
  72   const char *name;                     /* Name of the hash function */
  73   size_t hashsz;                        /* Size of output hash */
  74   ghash *(*init)(void);                 /* Create a new hash instance */
  75 } gchash;
  76
  77 /*----- That's all, folks -------------------------------------------------*/
  78
  79 #ifdef __cplusplus
  80   }
  81 #endif
  82
  83 #endif