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[u/mdw/catacomb] / des3.h

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-/* -*-c-*-
- *
- * $Id: des3.h,v 1.4 2004/04/08 01:36:15 mdw Exp $
- *
- * Implementation of double- and triple-DES
- *
- * (c) 1999 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.
- */
-
-#ifndef CATACOMB_DES3_H
-#define CATACOMB_DES3_H
-
-#ifdef __cplusplus
-  extern "C" {
-#endif
-
-/*----- Notes on double- and triple-DES -----------------------------------*
- *
- * The normal recommendation for using DES now is `triple DES'.
- * Conventionally, this involves an encrypt-decrypt-encrypt sequence,
- * although whether the first and last operations use the same key is
- * unfortunately not agreed upon.  This interface handles both cases (and the
- * single-key one too, although the simple @des@ calls are quicker for that).
- */
-
-/*----- Header files ------------------------------------------------------*/
-
-#include <stddef.h>
-
-#include <mLib/bits.h>
-
-#ifndef CATACOMB_DES_H
-#  include "des.h"
-#endif
-
-/*----- Magical numbers ---------------------------------------------------*/
-
-#define DES3_BLKSZ 8
-#define DES3_KEYSZ 21
-#define DES3_CLASS (N, B, 64)
-
-extern const octet des3_keysz[];
-
-/*----- Data structures ---------------------------------------------------*/
-
-typedef struct des3_ctx {
-  des_ctx a, b, c;
-} des3_ctx;
-
-/*----- Functions provided ------------------------------------------------*/
-
-/* --- @des3_init@ --- *
- *
- * Arguments:  @des3_ctx *k@ = pointer to key block
- *             @const void *buf@ = pointer to key buffer
- *             @size_t sz@ = size of key material
- *
- * Returns:    ---
- *
- * Use:                Initializes a DES key buffer.  The key buffer may have length
- *             7, 8, 14, 16, 21, or 24.  These correspond to one, two or
- *             three DES keys, either packed or unpacked (i.e., still
- *             containing parity bits).
- */
-
-extern void des3_init(des3_ctx */*k*/, const void */*buf*/, size_t /*sz*/);
-
-/* --- @des3_eblk@, @des_dblk@ --- *
- *
- * Arguments:  @const des3_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 des3_eblk(const des3_ctx */*k*/,
-                     const uint32 */*s*/, uint32 */*d*/);
-extern void des3_dblk(const des3_ctx */*k*/,
-                     const uint32 */*s*/, uint32 */*d*/);
-
-/*----- That's all, folks -------------------------------------------------*/
-
-#ifdef __cplusplus
-  }
-#endif
-
-#endif