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   1 /* -*-c-*-
   2  *
   3  * $Id: mars.h,v 1.1 2001/04/29 18:11:19 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 /*----- Revision history --------------------------------------------------*
  31  *
  32  * $Log: mars.h,v $
  33  * Revision 1.1  2001/04/29 18:11:19  mdw
  34  * New block cipher MARS.
  35  *
  36  */
  37
  38 /*----- Notes on the MARS block cipher ------------------------------------*
  39  *
  40  * MARS was IBM's submission to the AES contest.  It was designed by a number
  41  * of clever people at the T. J. Watson labs, and made it to the second round
  42  * of the contest.  Unfortunately, MARS is rather messy.  There are some
  43  * awkward corner cases in the key schedule algorithm, for example, that show
  44  * up very rarely.
  45  */
  46
  47 #ifndef CATACOMB_MARS_H
  48 #define CATACOMB_MARS_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 MARS_BLKSZ 16
  63 #define MARS_KEYSZ 32
  64 #define MARS_CLASS (N, L, 128)
  65
  66 extern const octet mars_keysz[];
  67
  68 /*----- Data structures ---------------------------------------------------*/
  69
  70 typedef struct mars_ctx {
  71   uint32 k[40];
  72 } mars_ctx;
  73
  74 /*----- Functions provided ------------------------------------------------*/
  75
  76 /* --- @mars_init@ --- *
  77  *
  78  * Arguments:   @mars_ctx *k@ = pointer to key block to fill in
  79  *              @const void *buf@ = pointer to buffer of key material
  80  *              @size_t sz@ = size of key material
  81  *
  82  * Returns:     ---
  83  *
  84  * Use:         Initializes a MARS key buffer.  MARS accepts key sizes
  85  *              between 128 and 448 bits which are a multiple of 32 bits.
  86  */
  87
  88 extern void mars_init(mars_ctx */*k*/,
  89                       const void */*buf*/, size_t /*sz*/);
  90
  91 /* --- @mars_eblk@, @mars_dblk@ --- *
  92  *
  93  * Arguments:   @const mars_ctx *k@ = pointer to key block
  94  *              @const uint32 s[4]@ = pointer to source block
  95  *              @uint32 d[4]@ = pointer to destination block
  96  *
  97  * Returns:     ---
  98  *
  99  * Use:         Low-level block encryption and decryption.
 100  */
 101
 102 extern void mars_eblk(const mars_ctx */*k*/,
 103                       const uint32 */*s*/, uint32 */*d*/);
 104
 105 extern void mars_dblk(const mars_ctx */*k*/,
 106                       const uint32 */*s*/, uint32 */*d*/);
 107
 108 /*----- That's all, folks -------------------------------------------------*/
 109
 110 #ifdef __cplusplus
 111   }
 112 #endif
 113
 114 #endif