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   1 /* -*-c-*-
   2  *
   3  * $Id: rijndael.h,v 1.2 2000/10/08 15:48:58 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 1.2  2000/10/08 15:48:58  mdw
  34  * Update comments now that AES has been chosen.
  35  *
  36  * Revision 1.1  2000/06/17 11:56:07  mdw
  37  * New cipher.
  38  *
  39  */
  40
  41 /*----- Notes on the Rijndael block cipher --------------------------------*
  42  *
  43  * Invented by Joan Daemen and Vincent Rijmen, Rijndael is a fast, elegant
  44  * and relatively simple 128-bit block cipher.  It was chosen by NIST to be
  45  * the new Advanced Encryption Standard (AES) algorithm.
  46  *
  47  * Rijnadel appears to have a low security margin.  I recommend waiting
  48  * before using Rijndael for any sensitive applications.
  49  */
  50
  51 #ifndef CATACOMB_RIJNDAEL_H
  52 #define CATACOMB_RIJNDAEL_H
  53
  54 #ifdef __cplusplus
  55   extern "C" {
  56 #endif
  57
  58 /*----- Header files ------------------------------------------------------*/
  59
  60 #include <stddef.h>
  61
  62 #include <mLib/bits.h>
  63
  64 /*----- Magical numbers ---------------------------------------------------*/
  65
  66 #define RIJNDAEL_BLKSZ 16
  67 #define RIJNDAEL_KEYSZ 32
  68 #define RIJNDAEL_CLASS (N, L, 128)
  69
  70 extern const octet rijndael_keysz[];
  71
  72 /*----- Data structures ---------------------------------------------------*/
  73
  74 #define RIJNDAEL_MAXROUNDS 32
  75 #define RIJNDAEL_KWORDS ((RIJNDAEL_MAXROUNDS + 1) * (RIJNDAEL_BLKSZ / 4))
  76
  77 typedef struct rijndael_ctx {
  78   unsigned nr;
  79   uint32 w[RIJNDAEL_KWORDS];
  80   uint32 wi[RIJNDAEL_KWORDS];
  81 } rijndael_ctx;
  82
  83 /*----- Functions provided ------------------------------------------------*/
  84
  85 /* --- @rijndael_init@ --- *
  86  *
  87  * Arguments:   @rijndael_ctx *k@ = pointer to context to initialize
  88  *              @const void *buf@ = pointer to buffer of key material
  89  *              @size_t sz@ = size of the key material
  90  *
  91  * Returns:     ---
  92  *
  93  * Use:         Initializes a Rijndael context with a particular key.  This
  94  *              implementation of Rijndael doesn't impose any particular
  95  *              limits on the key size except that it must be multiple of 4
  96  *              bytes long.  256 bits seems sensible, though.
  97  */
  98
  99 extern void rijndael_init(rijndael_ctx */*k*/,
 100                           const void */*buf*/, size_t /*sz*/);
 101
 102 /* --- @rijndael_eblk@, @rijndael_dblk@ --- *
 103  *
 104  * Arguments:   @const rijndael_ctx *k@ = pointer to Rijndael context
 105  *              @const uint32 s[4]@ = pointer to source block
 106  *              @uint32 d[4]@ = pointer to destination block
 107  *
 108  * Returns:     ---
 109  *
 110  * Use:         Low-level block encryption and decryption.
 111  */
 112
 113 extern void rijndael_eblk(const rijndael_ctx */*k*/,
 114                           const uint32 */*s*/, uint32 */*dst*/);
 115 extern void rijndael_dblk(const rijndael_ctx */*k*/,
 116                           const uint32 */*s*/, uint32 */*dst*/);
 117
 118 /*----- That's all, folks -------------------------------------------------*/
 119
 120 #ifdef __cplusplus
 121   }
 122 #endif
 123
 124 #endif