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

   1 /* -*-c-*-
   2  *
   3  * $Id: gmac.h,v 1.4 2004/04/08 01:36:15 mdw Exp $
   4  *
   5  * Generic MAC 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 #ifndef CATACOMB_GMAC_H
  31 #define CATACOMB_GMAC_H
  32
  33 #ifdef __cplusplus
  34   extern "C" {
  35 #endif
  36
  37 /*----- Header files ------------------------------------------------------*/
  38
  39 #include <stddef.h>
  40
  41 #ifndef CATACOMB_GCIPHER_H
  42 #  include "gcipher.h"
  43 #endif
  44
  45 #ifndef CATACOMB_GHASH_H
  46 #  include "ghash.h"
  47 #endif
  48
  49 /*----- Generic MAC function interface ------------------------------------*/
  50
  51 typedef struct gmac {
  52   const struct gmac_ops *ops;           /* Pointer to MAC operations */
  53 } gmac;
  54
  55 typedef struct gmac_ops {
  56   const struct gcmac *c;                /* Pointer to MAC class */
  57   ghash *(*init)(gmac */*m*/);          /* Create keyed hash instance */
  58   void (*destroy)(gmac */*m*/);         /* Destroy MAC key block */
  59 } gmac_ops;
  60
  61 typedef struct gcmac {
  62   const char *name;                     /* Name of the MAC function */
  63   size_t hashsz;                        /* Size of output hash */
  64   const octet *keysz;                   /* Key size options */
  65   gmac *(*key)(const void */*k*/, size_t /*sz*/); /* Create key */
  66 } gcmac;
  67
  68 #define GM_KEY(cm, k, ksz)      (cm)->key((k), (ksz))
  69 #define GM_CLASS(km)            (km)->ops->c
  70 #define GM_INIT(km)             (km)->ops->init((km))
  71 #define GM_DESTROY(km)          (km)->ops->destroy((km))
  72
  73 /*----- Tables ------------------------------------------------------------*/
  74
  75 extern const gcmac *const gmactab[];
  76
  77 /* --- @gmac_byname@ --- *
  78  *
  79  * Arguments:   @const char *p@ = pointer to name string
  80  *
  81  * Returns:     The named cipher class, or null.
  82  */
  83
  84 extern const gcmac *gmac_byname(const char */*p*/);
  85
  86 /*----- That's all, folks -------------------------------------------------*/
  87
  88 #ifdef __cplusplus
  89   }
  90 #endif
  91
  92 #endif