git.distorted.org.uk Git - u/mdw/catacomb/blob - symm/gmac.h

   1 /* -*-c-*-
   2  *
   3  * Generic MAC function 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_GMAC_H
  29 #define CATACOMB_GMAC_H
  30
  31 #ifdef __cplusplus
  32   extern "C" {
  33 #endif
  34
  35 /*----- Header files ------------------------------------------------------*/
  36
  37 #include <stddef.h>
  38
  39 #ifndef CATACOMB_GCIPHER_H
  40 #  include "gcipher.h"
  41 #endif
  42
  43 #ifndef CATACOMB_GHASH_H
  44 #  include "ghash.h"
  45 #endif
  46
  47 /*----- Generic MAC function interface ------------------------------------*/
  48
  49 typedef struct gmac {
  50   const struct gmac_ops *ops;           /* Pointer to MAC operations */
  51 } gmac;
  52
  53 typedef struct gmac_ops {
  54   const struct gcmac *c;                /* Pointer to MAC class */
  55   ghash *(*init)(gmac */*m*/);          /* Create keyed hash instance */
  56   void (*destroy)(gmac */*m*/);         /* Destroy MAC key block */
  57 } gmac_ops;
  58
  59 typedef struct gcmac {
  60   const char *name;                     /* Name of the MAC function */
  61   size_t hashsz;                        /* Size of output hash */
  62   const octet *keysz;                   /* Key size options */
  63   gmac *(*key)(const void */*k*/, size_t /*sz*/); /* Create key */
  64 } gcmac;
  65
  66 #define GM_KEY(cm, k, ksz)      (cm)->key((k), (ksz))
  67 #define GM_CLASS(km)            (km)->ops->c
  68 #define GM_INIT(km)             (km)->ops->init((km))
  69 #define GM_DESTROY(km)          (km)->ops->destroy((km))
  70
  71 /*----- Tables ------------------------------------------------------------*/
  72
  73 extern const gcmac *const gmactab[];
  74
  75 /* --- @gmac_byname@ --- *
  76  *
  77  * Arguments:   @const char *p@ = pointer to name string
  78  *
  79  * Returns:     The named cipher class, or null.
  80  */
  81
  82 extern const gcmac *gmac_byname(const char */*p*/);
  83
  84 /*----- That's all, folks -------------------------------------------------*/
  85
  86 #ifdef __cplusplus
  87   }
  88 #endif
  89
  90 #endif