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[u/mdw/catacomb] / twofish.h

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-/* -*-c-*-
- *
- * $Id: twofish.h,v 1.5 2004/04/08 01:36:15 mdw Exp $
- *
- * The Twofish 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 Twofish block cipher ---------------------------------*
- *
- * Twofish was designed by Bruce Schneier, John Kelsey, Doug Whiting, David
- * Wagner, Chris Hall and Niels Ferguson.  The algorithm is unpatented and
- * free for anyone to use.  It was one of the five AES finalist algorithms.
- *
- * Twofish is a complex cipher offering various space and time tradeoffs.
- * This implementation has a heavy key schedule and fast bulk encryption.
- */
-
-#ifndef CATACOMB_TWOFISH_H
-#define CATACOMB_TWOFISH_H
-
-#ifdef __cplusplus
-  extern "C" {
-#endif
-
-/*----- Header files ------------------------------------------------------*/
-
-#include <stddef.h>
-
-#include <mLib/bits.h>
-
-/*----- Magical numbers ---------------------------------------------------*/
-
-#define TWOFISH_BLKSZ 16
-#define TWOFISH_KEYSZ 32
-#define TWOFISH_CLASS (N, L, 128)
-
-extern const octet twofish_keysz[];
-
-/*----- Data structures ---------------------------------------------------*/
-
-typedef struct twofish_ctx {
-  uint32 k[40];
-  uint32 g[4][256];
-} twofish_ctx;
-
-typedef struct twofish_fk {
-  uint32 t0[8], t23[8], t4[2];
-  octet t1[32];
-} twofish_fk;
-
-/*----- Functions provided ------------------------------------------------*/
-
-/* --- @twofish_initfk@ --- *
- *
- * Arguments:  @twofish_ctx *k@ = pointer to key block to fill in
- *             @const void *buf@ = pointer to buffer of key material
- *             @size_t sz@ = size of key material
- *             @const twofish_fk *fk@ = family-key information
- *
- * Returns:    ---
- *
- * Use:                Does the underlying Twofish key initialization with family
- *             key.  Pass in a family-key structure initialized to
- *             all-bits-zero for a standard key schedule.
- */
-
-extern void twofish_initfk(twofish_ctx */*k*/, const void */*buf*/,
-                          size_t /*sz*/, const twofish_fk */*fk*/);
-
-/* --- @twofish_init@ --- *
- *
- * Arguments:  @twofish_ctx *k@ = pointer to key block to fill in
- *             @const void *buf@ = pointer to buffer of key material
- *             @size_t sz@ = size of key material
- *
- * Returns:    ---
- *
- * Use:                Initializes a Twofish key buffer.  Twofish accepts keys of up
- *             to 256 bits in length.
- */
-
-extern void twofish_init(twofish_ctx */*k*/,
-                        const void */*buf*/, size_t /*sz*/);
-
-/* --- @twofish_fkinit@ --- *
- *
- * Arguments:  @twofish_fk *fk@ = pointer to family key block
- *             @const void *buf@ = pointer to buffer of key material
- *             @size_t sz@ = size of key material
- *
- * Returns:    ---
- *
- * Use:                Initializes a family-key buffer.  This implementation allows
- *             family keys of any size acceptable to the Twofish algorithm.
- */
-
-extern void twofish_fkinit(twofish_fk */*fk*/,
-                          const void */*buf*/, size_t /*sz*/);
-
-/* --- @twofish_eblk@, @twofish_dblk@ --- *
- *
- * Arguments:  @const twofish_ctx *k@ = pointer to key block
- *             @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 twofish_eblk(const twofish_ctx */*k*/,
-                        const uint32 */*s*/, uint32 */*d*/);
-
-extern void twofish_dblk(const twofish_ctx */*k*/,
-                        const uint32 */*s*/, uint32 */*d*/);
-
-/*----- That's all, folks -------------------------------------------------*/
-
-#ifdef __cplusplus
-  }
-#endif
-
-#endif