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[u/mdw/catacomb] / square.h

diff --git a/square.h b/square.h
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-/* -*-c-*-
- *
- * $Id: square.h,v 1.2 2004/04/08 01:36:15 mdw Exp $
- *
- * The Square block cipher
- *
- * (c) 2000 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 Square block cipher ----------------------------------*
- *
- * Invented by Joan Daemen and Vincent Rijmen, Square is a fast and
- * relatively simple 128-bit block cipher.  It is the predecessor to
- * Rijndael.  I have grave doubts about the security of Square, though: a
- * dedicated attack against Square's structure by Knudsen has been extended
- * by the Twofish team against Rijndael, and I believe that this extended
- * attack is also effective against Square.  This is a shame: the structure
- * of Square (and Rijndael) is extremely elegant, and has some extremely nice
- * properties.
- */
-
-#ifndef CATACOMB_SQUARE_H
-#define CATACOMB_SQUARE_H
-
-#ifdef __cplusplus
-  extern "C" {
-#endif
-
-/*----- Header files ------------------------------------------------------*/
-
-#include <stddef.h>
-
-#include <mLib/bits.h>
-
-/*----- Magical numbers ---------------------------------------------------*/
-
-#define SQUARE_BLKSZ 16
-#define SQUARE_KEYSZ 16
-#define SQUARE_CLASS (N, L, 128)
-
-extern const octet square_keysz[];
-
-/*----- Data structures ---------------------------------------------------*/
-
-#define SQUARE_MAXROUNDS 8
-#define SQUARE_KWORDS ((SQUARE_MAXROUNDS + 1) * (SQUARE_BLKSZ / 4))
-
-typedef struct square_ctx {
-  uint32 w[SQUARE_KWORDS];
-  uint32 wi[SQUARE_KWORDS];
-} square_ctx;
-
-/*----- Functions provided ------------------------------------------------*/
-
-/* --- @square_init@ --- *
- *
- * Arguments:  @square_ctx *k@ = pointer to context to initialize
- *             @const void *buf@ = pointer to buffer of key material
- *             @size_t sz@ = size of the key material
- *
- * Returns:    ---
- *
- * Use:                Initializes a Square context with a particular key.  This
- *             implementation of Square doesn't impose any particular
- *             limits on the key size except that it must be multiple of 4
- *             bytes long.  256 bits seems sensible, though.
- */
-
-extern void square_init(square_ctx */*k*/,
-                         const void */*buf*/, size_t /*sz*/);
-
-/* --- @square_eblk@, @square_dblk@ --- *
- *
- * Arguments:  @const square_ctx *k@ = pointer to Square context
- *             @const uint32 s[4]@ = pointer to source block
- *             @uint32 d[4]@ = pointer to destination block
- *
- * Returns:    ---
- *
- * Use:                Low-level block encryption and decryption.
- */
-
-extern void square_eblk(const square_ctx */*k*/,
-                         const uint32 */*s*/, uint32 */*dst*/);
-extern void square_dblk(const square_ctx */*k*/,
-                         const uint32 */*s*/, uint32 */*dst*/);
-
-/*----- That's all, folks -------------------------------------------------*/
-
-#ifdef __cplusplus
-  }
-#endif
-
-#endif