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[u/mdw/catacomb] / safer.h

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-/* -*-c-*-
- *
- * $Id: safer.h,v 1.3 2004/04/08 01:36:15 mdw Exp $
- *
- * The SAFER block cipher
- *
- * (c) 2001 Straylight/Edgeware
- */
-
-/*----- Licensing notice --------------------------------------------------*
- *
- * This file is part of Catacomb.
- *
- * Catacomb is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Library General Public License as
- * published by the Free Software Foundation; either version 2 of the
- * License, or (at your option) any later version.
- *
- * Catacomb is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public
- * License along with Catacomb; if not, write to the Free
- * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
- * MA 02111-1307, USA.
- */
-
-/*----- Notes on the SAFER block cipher -----------------------------------*
- *
- * SAFER was designed by James Massey (who also worked on IDEA) for Cylink.
- * It's free -- patents or other silliness.  The original key schedule had
- * some weaknesses, and a new one (the SK version) was added.  SAFER has a
- * variable number of rounds.  The standard interface uses the recommended
- * number for the given key schedule algorithm and key size.
- *
- * SAFER got a bad press in Schneier's book `Applied Cryptography'.  I think
- * this is undeserved.  SAFER is a well-designed cipher which mostly looks
- * pretty solid.
- */
-
-#ifndef CATACOMB_SAFER_H
-#define CATACOMB_SAFER_H
-
-#ifdef __cplusplus
-  extern "C" {
-#endif
-
-/*----- Header files ------------------------------------------------------*/
-
-#include <stddef.h>
-
-#include <mLib/bits.h>
-
-/*----- Magical numbers ---------------------------------------------------*/
-
-#define SAFER_BLKSZ 8
-#define SAFER_KEYSZ 8
-#define SAFER_CLASS (N, B, 64)
-
-#define SAFERSK_BLKSZ SAFER_BLKSZ
-#define SAFERSK_KEYSZ 16
-#define SAFERSK_CLASS SAFER_CLASS
-
-#define SAFER_MAXROUNDS 12
-
-extern const octet safer_keysz[];
-#define safersk_keysz safer_keysz
-
-/*----- Data structures ---------------------------------------------------*/
-
-typedef struct safer_ctx {
-  octet k[8 * (2 * SAFER_MAXROUNDS + 1)];
-  unsigned r;
-} safer_ctx, safersk_ctx;
-
-/*----- Functions provided ------------------------------------------------*/
-
-/* --- @safer_setup@ --- *
- *
- * Arguments:  @safer_ctx *k@ = pointer to context to initialize
- *             @unsigned r@ = number of rounds wanted
- *             @unsigned f@ = various other flags
- *             @const void *buf@ = pointer to key material
- *             @size_t sz@ = size of key material in bytes
- *
- * Returns:    ---
- *
- * Use:                Initializes an SAFER expanded key.  A default number of
- *             rounds is chosen, based on the key length.
- */
-
-#define SAFER_SK 1u
-
-extern void safer_setup(safer_ctx */*k*/, unsigned /*r*/, unsigned /*f*/,
-                       const void */*buf*/, size_t /*sz*/);
-
-/* --- @safer_init@, @safersk_init@ --- *
- *
- * Arguments:  @safer_ctx *k@ = pointer to context to initialize
- *             @const void *buf@ = pointer to key material
- *             @size_t sz@ = size of key material in bytes
- *
- * Returns:    ---
- *
- * Use:                Initializes an SAFER expanded key.  A default number of
- *             rounds is chosen, based on the key length.
- */
-
-extern void safer_init(safer_ctx */*k*/,
-                      const void */*buf*/, size_t /*sz*/);
-extern void safersk_init(safer_ctx */*k*/,
-                        const void */*buf*/, size_t /*sz*/);
-
-/* --- @safer_eblk@, @safer_dblk@ --- *
- *
- * Arguments:  @const safer_ctx *k@ = pointer to SAFER context
- *             @const uint32 s[2]@ = pointer to source block
- *             @const uint32 d[2]@ = pointer to destination block
- *
- * Returns:    ---
- *
- * Use:                Low-level block encryption and decryption.
- */
-
-extern void safer_eblk(const safer_ctx */*k*/,
-                      const uint32 */*s*/, uint32 */*dst*/);
-extern void safer_dblk(const safer_ctx */*k*/,
-                      const uint32 */*s*/, uint32 */*dst*/);
-
-#define safersk_eblk safer_eblk
-#define safersk_dblk safer_dblk
-
-/*----- That's all, folks -------------------------------------------------*/
-
-#ifdef __cplusplus
-  }
-#endif
-
-#endif