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

   1 /* -*-c-*-
   2  *
   3  * $Id: mars.h,v 1.2 2004/04/08 01:36:15 mdw Exp $
   4  *
   5  * The MARS block cipher
   6  *
   7  * (c) 2001 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 /*----- Notes on the MARS block cipher ------------------------------------*
  31  *
  32  * MARS was IBM's submission to the AES contest.  It was designed by a number
  33  * of clever people at the T. J. Watson labs, and made it to the second round
  34  * of the contest.  Unfortunately, MARS is rather messy.  There are some
  35  * awkward corner cases in the key schedule algorithm, for example, that show
  36  * up very rarely.
  37  */
  38
  39 #ifndef CATACOMB_MARS_H
  40 #define CATACOMB_MARS_H
  41
  42 #ifdef __cplusplus
  43   extern "C" {
  44 #endif
  45
  46 /*----- Header files ------------------------------------------------------*/
  47
  48 #include <stddef.h>
  49
  50 #include <mLib/bits.h>
  51
  52 /*----- Magical numbers ---------------------------------------------------*/
  53
  54 #define MARS_BLKSZ 16
  55 #define MARS_KEYSZ 32
  56 #define MARS_CLASS (N, L, 128)
  57
  58 extern const octet mars_keysz[];
  59
  60 /*----- Data structures ---------------------------------------------------*/
  61
  62 typedef struct mars_ctx {
  63   uint32 k[40];
  64 } mars_ctx;
  65
  66 /*----- Functions provided ------------------------------------------------*/
  67
  68 /* --- @mars_init@ --- *
  69  *
  70  * Arguments:   @mars_ctx *k@ = pointer to key block to fill in
  71  *              @const void *buf@ = pointer to buffer of key material
  72  *              @size_t sz@ = size of key material
  73  *
  74  * Returns:     ---
  75  *
  76  * Use:         Initializes a MARS key buffer.  MARS accepts key sizes
  77  *              between 128 and 448 bits which are a multiple of 32 bits.
  78  */
  79
  80 extern void mars_init(mars_ctx */*k*/,
  81                       const void */*buf*/, size_t /*sz*/);
  82
  83 /* --- @mars_eblk@, @mars_dblk@ --- *
  84  *
  85  * Arguments:   @const mars_ctx *k@ = pointer to key block
  86  *              @const uint32 s[4]@ = pointer to source block
  87  *              @uint32 d[4]@ = pointer to destination block
  88  *
  89  * Returns:     ---
  90  *
  91  * Use:         Low-level block encryption and decryption.
  92  */
  93
  94 extern void mars_eblk(const mars_ctx */*k*/,
  95                       const uint32 */*s*/, uint32 */*d*/);
  96
  97 extern void mars_dblk(const mars_ctx */*k*/,
  98                       const uint32 */*s*/, uint32 */*d*/);
  99
 100 /*----- That's all, folks -------------------------------------------------*/
 101
 102 #ifdef __cplusplus
 103   }
 104 #endif
 105
 106 #endif