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

   1 /* -*-c-*-
   2  *
   3  * Generic symmetric cipher 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_GCIPHER_H
  29 #define CATACOMB_GCIPHER_H
  30
  31 #ifdef __cplusplus
  32   extern "C" {
  33 #endif
  34
  35 /*----- Header files ------------------------------------------------------*/
  36
  37 #include <stddef.h>
  38
  39 #include <mLib/bits.h>
  40
  41 #ifndef CATACOMB_KEYSZ_H
  42 #  include "keysz.h"
  43 #endif
  44
  45 /*----- Generic symmetric cipher interface --------------------------------*/
  46
  47 typedef struct gcipher {
  48   const struct gcipher_ops *ops;        /* Pointer to cipher operations */
  49 } gcipher;
  50
  51 typedef struct gcipher_ops {
  52   const struct gccipher *c;             /* Pointer to cipher class */
  53   void (*encrypt)(gcipher */*c*/, const void */*s*/,
  54                   void */*t*/, size_t /*sz*/);
  55   void (*decrypt)(gcipher */*c*/, const void */*s*/,
  56                   void */*t*/, size_t /*sz*/);
  57   void (*destroy)(gcipher */*c*/);
  58   void (*setiv)(gcipher */*c*/, const void */*iv*/);
  59   void (*bdry)(gcipher */*c*/);
  60 } gcipher_ops;
  61
  62 typedef struct gccipher {
  63   const char *name;                     /* Cipher name */
  64   const octet *keysz;                   /* Preferred key size table */
  65   size_t blksz;                         /* Block size or zero if none */
  66   gcipher *(*init)(const void */*k*/, size_t /*sz*/);
  67 } gccipher;
  68
  69 #define GC_INIT(cc, k, sz)      (cc)->init((k), (sz))
  70 #define GC_CLASS(cc)            (cc)->ops->c
  71 #define GC_ENCRYPT(c, s, t, sz) (c)->ops->encrypt((c), (s), (t), (sz))
  72 #define GC_DECRYPT(c, s, t, sz) (c)->ops->decrypt((c), (s), (t), (sz))
  73 #define GC_DESTROY(c)           (c)->ops->destroy((c))
  74 #define GC_SETIV(c, iv)         (c)->ops->setiv((c), (iv))
  75 #define GC_BDRY(c)              (c)->ops->bdry((c))
  76
  77 /*----- Tables ------------------------------------------------------------*/
  78
  79 extern const gccipher *const gciphertab[];
  80
  81 /* --- @gcipher_byname@ --- *
  82  *
  83  * Arguments:   @const char *p@ = pointer to name string
  84  *
  85  * Returns:     The named cipher class, or null.
  86  */
  87
  88 extern const gccipher *gcipher_byname(const char */*p*/);
  89
  90 /*----- That's all, folks -------------------------------------------------*/
  91
  92 #ifdef __cplusplus
  93   }
  94 #endif
  95
  96 #endif