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[u/mdw/catacomb] / cast128.h

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-/* -*-c-*-
- *
- * $Id: cast128.h,v 1.2 2004/04/08 01:36:15 mdw Exp $
- *
- * The CAST-128 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 CAST-128 block cipher --------------------------------*
- *
- * CAST, designed by Carlisle Adams and Stafford Tavares, is a method for
- * designing block ciphers, based around the concept of `bent functions'.  It
- * is described in the paper `Constructing Symmetric Ciphers using the CAST
- * Design Procedure' by Carlisle Adams.
- *
- * CAST-128, defined in RFC2144, is a particular instance of the CAST design
- * procedure, The cipher seems strong and fairly quick.  The design procedure
- * itself is patented, although the cipher CAST-128 is free to use.
- *
- * Although CAST ciphers are resistant to differential and linear
- * cryptanalysis, some instances have been broken by more advanced techniques
- * -- the CAST procedure does not guarantee a strong cipher.  However,
- * CAST-128 has so far resisted all attacks against it, and has now been
- * accepted by the Canadian government for protection of all `Designated'
- * material.
- */
-
-#ifndef CATACOMB_CAST128_H
-#define CATACOMB_CAST128_H
-
-#ifdef __cplusplus
-  extern "C" {
-#endif
-
-/*----- Header files ------------------------------------------------------*/
-
-#include <mLib/bits.h>
-
-/*----- Magic numbers -----------------------------------------------------*/
-
-#define CAST128_BLKSZ 8
-#define CAST128_KEYSZ 16
-#define CAST128_CLASS (N, B, 64)
-
-extern const octet cast128_keysz[];
-
-/*----- Data structures ---------------------------------------------------*/
-
-typedef struct cast128_ctx {
-  unsigned r;
-  uint32 km[16];
-  octet kr[16];
-} cast128_ctx;
-
-/*----- Functions provided ------------------------------------------------*/
-
-/* --- @cast128_init@ --- *
- *
- * Arguments:  @cast128_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 CAST-128 key buffer.  CAST-128 accepts
- *             128-bit keys or shorter.
- */
-
-extern void cast128_init(cast128_ctx */*k*/,
-                        const void */*buf*/, size_t /*sz*/);
-
-/* --- @cast128_eblk@, @cast128_dblk@ --- *
- *
- * Arguments:  @const cast128_ctx *k@ = pointer to key block
- *             @const uint32 s[2]@ = pointer to source block
- *             @uint32 d[2]@ = pointer to destination block
- *
- * Returns:    ---
- *
- * Use:                Low-level block encryption and decryption.
- */
-
-extern void cast128_eblk(const cast128_ctx */*k*/,
-                        const uint32 */*s*/, uint32 */*d*/);
-
-extern void cast128_dblk(const cast128_ctx */*k*/,
-                        const uint32 */*s*/, uint32 */*d*/);
-
-/*----- That's all, folks -------------------------------------------------*/
-
-#ifdef __cplusplus
-  }
-#endif
-
-#endif