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   1 /* -*-c-*-
   2  *
   3  * $Id: gcipher.h,v 1.5 2004/04/21 00:37:32 mdw Exp $
   4  *
   5  * Generic symmetric cipher 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_GCIPHER_H
  31 #define CATACOMB_GCIPHER_H
  32
  33 #ifdef __cplusplus
  34   extern "C" {
  35 #endif
  36
  37 /*----- Header files ------------------------------------------------------*/
  38
  39 #include <stddef.h>
  40
  41 #include <mLib/bits.h>
  42
  43 #ifndef CATACOMB_KEYSZ_H
  44 #  include "keysz.h"
  45 #endif
  46
  47 /*----- Generic symmetric cipher interface --------------------------------*/
  48
  49 typedef struct gcipher {
  50   const struct gcipher_ops *ops;        /* Pointer to cipher operations */
  51 } gcipher;
  52
  53 typedef struct gcipher_ops {
  54   const struct gccipher *c;             /* Pointer to cipher class */
  55   void (*encrypt)(gcipher */*c*/, const void */*s*/,
  56                   void */*t*/, size_t /*sz*/);
  57   void (*decrypt)(gcipher */*c*/, const void */*s*/,
  58                   void */*t*/, size_t /*sz*/);
  59   void (*destroy)(gcipher */*c*/);
  60   void (*setiv)(gcipher */*c*/, const void */*iv*/);
  61   void (*bdry)(gcipher */*c*/);
  62 } gcipher_ops;
  63
  64 typedef struct gccipher {
  65   const char *name;                     /* Cipher name */
  66   const octet *keysz;                   /* Preferred key size table */
  67   size_t blksz;                         /* Block size or zero if none */
  68   gcipher *(*init)(const void */*k*/, size_t /*sz*/);
  69 } gccipher;
  70
  71 #define GC_INIT(cc, k, sz)      (cc)->init((k), (sz))
  72 #define GC_CLASS(cc)            (cc)->ops->c
  73 #define GC_ENCRYPT(c, s, t, sz) (c)->ops->encrypt((c), (s), (t), (sz))
  74 #define GC_DECRYPT(c, s, t, sz) (c)->ops->decrypt((c), (s), (t), (sz))
  75 #define GC_DESTROY(c)           (c)->ops->destroy((c))
  76 #define GC_SETIV(c, iv)         (c)->ops->setiv((c), (iv))
  77 #define GC_BDRY(c)              (c)->ops->bdry((c))
  78
  79 /*----- Tables ------------------------------------------------------------*/
  80
  81 extern const gccipher *const gciphertab[];
  82
  83 /* --- @gcipher_byname@ --- *
  84  *
  85  * Arguments:   @const char *p@ = pointer to name string
  86  *
  87  * Returns:     The named cipher class, or null.
  88  */
  89
  90 extern const gccipher *gcipher_byname(const char */*p*/);
  91
  92 /*----- That's all, folks -------------------------------------------------*/
  93
  94 #ifdef __cplusplus
  95   }
  96 #endif
  97
  98 #endif