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

   1 /* -*-c-*-
   2  *
   3  * The MARS block cipher
   4  *
   5  * (c) 2001 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 /*----- Notes on the MARS block cipher ------------------------------------*
  29  *
  30  * MARS was IBM's submission to the AES contest.  It was designed by a number
  31  * of clever people at the T. J. Watson labs, and made it to the second round
  32  * of the contest.  Unfortunately, MARS is rather messy.  There are some
  33  * awkward corner cases in the key schedule algorithm, for example, that show
  34  * up very rarely.
  35  */
  36
  37 #ifndef CATACOMB_MARS_H
  38 #define CATACOMB_MARS_H
  39
  40 #ifdef __cplusplus
  41   extern "C" {
  42 #endif
  43
  44 /*----- Header files ------------------------------------------------------*/
  45
  46 #include <stddef.h>
  47
  48 #include <mLib/bits.h>
  49
  50 /*----- Magical numbers ---------------------------------------------------*/
  51
  52 #define MARS_BLKSZ 16
  53 #define MARS_KEYSZ 32
  54 #define MARS_CLASS (N, L, 128)
  55
  56 extern const octet mars_keysz[];
  57
  58 /*----- Data structures ---------------------------------------------------*/
  59
  60 typedef struct mars_ctx {
  61   uint32 k[40];
  62 } mars_ctx;
  63
  64 /*----- Functions provided ------------------------------------------------*/
  65
  66 /* --- @mars_init@ --- *
  67  *
  68  * Arguments:   @mars_ctx *k@ = pointer to key block to fill in
  69  *              @const void *buf@ = pointer to buffer of key material
  70  *              @size_t sz@ = size of key material
  71  *
  72  * Returns:     ---
  73  *
  74  * Use:         Initializes a MARS key buffer.  MARS accepts key sizes
  75  *              between 128 and 448 bits which are a multiple of 32 bits.
  76  */
  77
  78 extern void mars_init(mars_ctx */*k*/,
  79                       const void */*buf*/, size_t /*sz*/);
  80
  81 /* --- @mars_eblk@, @mars_dblk@ --- *
  82  *
  83  * Arguments:   @const mars_ctx *k@ = pointer to key block
  84  *              @const uint32 s[4]@ = pointer to source block
  85  *              @uint32 d[4]@ = pointer to destination block
  86  *
  87  * Returns:     ---
  88  *
  89  * Use:         Low-level block encryption and decryption.
  90  */
  91
  92 extern void mars_eblk(const mars_ctx */*k*/,
  93                       const uint32 */*s*/, uint32 */*d*/);
  94
  95 extern void mars_dblk(const mars_ctx */*k*/,
  96                       const uint32 */*s*/, uint32 */*d*/);
  97
  98 /*----- That's all, folks -------------------------------------------------*/
  99
 100 #ifdef __cplusplus
 101   }
 102 #endif
 103
 104 #endif