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[u/mdw/catacomb] / blowfish.h

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-/* -*-c-*-
- *
- * $Id: blowfish.h,v 1.4 2004/04/08 01:36:15 mdw Exp $
- *
- * The Blowfish block cipher
- *
- * (c) 1998 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 Blowfish block cipher --------------------------------*
- *
- * Blowfish was invented by Bruce Schneier.  The algorithm is unpatented and
- * free for anyone to use.  It's fast, simple, offers a big key, and is
- * looking relatively bulletproof.  It's also this author's block cipher of
- * choice, for what little that's worth.  The disadvantage is that Blowfish
- * has a particularly heavyweight key schedule.
- */
-
-#ifndef CATACOMB_BLOWFISH_H
-#define CATACOMB_BLOWFISH_H
-
-#ifdef __cplusplus
-  extern "C" {
-#endif
-
-/*----- Header files ------------------------------------------------------*/
-
-#include <stddef.h>
-
-#include <mLib/bits.h>
-
-/*----- Magical numbers ---------------------------------------------------*/
-
-#define BLOWFISH_BLKSZ 8
-#define BLOWFISH_KEYSZ 32
-#define BLOWFISH_CLASS (N, B, 64)
-
-extern const octet blowfish_keysz[];
-
-/*----- Data structures ---------------------------------------------------*/
-
-typedef struct blowfish_ctx {
-  uint32 p[18];
-  uint32 s0[256], s1[256], s2[256], s3[256];
-} blowfish_ctx;
-
-/*----- Functions provided ------------------------------------------------*/
-
-/* --- @blowfish_init@ --- *
- *
- * Arguments:  @blowfish_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 Blowfish key buffer.  Blowfish accepts
- *             a more-or-less arbitrary size key.
- */
-
-extern void blowfish_init(blowfish_ctx */*k*/,
-                         const void */*buf*/, size_t /*sz*/);
-
-/* --- @blowfish_eblk@, @blowfish_dblk@ --- *
- *
- * Arguments:  @const blowfish_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 blowfish_eblk(const blowfish_ctx */*k*/,
-                         const uint32 */*s*/, uint32 */*d*/);
-
-extern void blowfish_dblk(const blowfish_ctx */*k*/,
-                         const uint32 */*s*/, uint32 */*d*/);
-
-/*----- That's all, folks -------------------------------------------------*/
-
-#ifdef __cplusplus
-  }
-#endif
-
-#endif