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   1 /* -*-c-*-
   2  *
   3  * $Id: rijndael.h,v 1.1 2000/06/17 11:56:07 mdw Exp $
   4  *
   5  * The Rijndael block cipher
   6  *
   7  * (c) 2000 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: rijndael.h,v $
  33  * Revision 1.1  2000/06/17 11:56:07  mdw
  34  * New cipher.
  35  *
  36  */
  37
  38 /*----- Notes on the Rijndael block cipher --------------------------------*
  39  *
  40  * Invented by Joan Daemen and Vincent Rijmen, Rijndael is a fast and
  41  * relatively simple 128-bit block cipher proposed by the designers as an AES
  42  * candidate.  At the time of writing, the AES winner hasn't been decided.
  43  * Rijnadel is fast, but has a low security margin.  I recommend waiting
  44  * before using Rijndael for any sensitive applications.
  45  */
  46
  47 #ifndef CATACOMB_RIJNDAEL_H
  48 #define CATACOMB_RIJNDAEL_H
  49
  50 #ifdef __cplusplus
  51   extern "C" {
  52 #endif
  53
  54 /*----- Header files ------------------------------------------------------*/
  55
  56 #include <stddef.h>
  57
  58 #include <mLib/bits.h>
  59
  60 /*----- Magical numbers ---------------------------------------------------*/
  61
  62 #define RIJNDAEL_BLKSZ 16
  63 #define RIJNDAEL_KEYSZ 32
  64 #define RIJNDAEL_CLASS (N, L, 128)
  65
  66 extern const octet rijndael_keysz[];
  67
  68 /*----- Data structures ---------------------------------------------------*/
  69
  70 #define RIJNDAEL_MAXROUNDS 32
  71 #define RIJNDAEL_KWORDS ((RIJNDAEL_MAXROUNDS + 1) * (RIJNDAEL_BLKSZ / 4))
  72
  73 typedef struct rijndael_ctx {
  74   unsigned nr;
  75   uint32 w[RIJNDAEL_KWORDS];
  76   uint32 wi[RIJNDAEL_KWORDS];
  77 } rijndael_ctx;
  78
  79 /*----- Functions provided ------------------------------------------------*/
  80
  81 /* --- @rijndael_init@ --- *
  82  *
  83  * Arguments:   @rijndael_ctx *k@ = pointer to context to initialize
  84  *              @const void *buf@ = pointer to buffer of key material
  85  *              @size_t sz@ = size of the key material
  86  *
  87  * Returns:     ---
  88  *
  89  * Use:         Initializes a Rijndael context with a particular key.  This
  90  *              implementation of Rijndael doesn't impose any particular
  91  *              limits on the key size except that it must be multiple of 4
  92  *              bytes long.  256 bits seems sensible, though.
  93  */
  94
  95 extern void rijndael_init(rijndael_ctx */*k*/,
  96                           const void */*buf*/, size_t /*sz*/);
  97
  98 /* --- @rijndael_eblk@, @rijndael_dblk@ --- *
  99  *
 100  * Arguments:   @const rijndael_ctx *k@ = pointer to Rijndael context
 101  *              @const uint32 s[4]@ = pointer to source block
 102  *              @uint32 d[4]@ = pointer to destination block
 103  *
 104  * Returns:     ---
 105  *
 106  * Use:         Low-level block encryption and decryption.
 107  */
 108
 109 extern void rijndael_eblk(const rijndael_ctx */*k*/,
 110                           const uint32 */*s*/, uint32 */*dst*/);
 111 extern void rijndael_dblk(const rijndael_ctx */*k*/,
 112                           const uint32 */*s*/, uint32 */*dst*/);
 113
 114 /*----- That's all, folks -------------------------------------------------*/
 115
 116 #ifdef __cplusplus
 117   }
 118 #endif
 119
 120 #endif