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[u/mdw/catacomb] / skipjack.h

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-/* -*-c-*-
- *
- * $Id: skipjack.h,v 1.3 2004/04/08 01:36:15 mdw Exp $
- *
- * The Skipjack 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 Skipjack block cipher --------------------------------*
- *
- * Skipjack was designed by the NSA, as a type II algorithm to be used in the
- * Clipper system.  It was initially classified, so that it couldn't be used
- * without the key escrow feature, though a team of `respectable'
- * cryptographers, including Dorothy Denning, had a quick look at it and
- * pronounced it `good', as if this was meant to be convincing.  It is
- * apparently a particular parameterization of a family which includes type I
- * algorithms.  Since declassification, Biham has discovered a miss-in-the-
- * middle attack which breaks Skipjack with 31 rounds faster than brute
- * force.
- *
- * This implementation is provided for interest's sake, and possibly for
- * interoperability, rather than as a good cipher to use.
- */
-
-#ifndef CATACOMB_SKIPJACK_H
-#define CATACOMB_SKIPJACK_H
-
-#ifdef __cplusplus
-  extern "C" {
-#endif
-
-/*----- Header files ------------------------------------------------------*/
-
-#include <stddef.h>
-
-#include <mLib/bits.h>
-
-/*----- Magical numbers ---------------------------------------------------*/
-
-#define SKIPJACK_BLKSZ 8
-#define SKIPJACK_KEYSZ 10
-#define SKIPJACK_CLASS (N, B, 64)
-
-extern const octet skipjack_keysz[];
-
-/*----- Data structures ---------------------------------------------------*/
-
-typedef struct skipjack_ctx {
-  uint32 ka, kb, kc, kd, ke;
-} skipjack_ctx;
-
-/*----- Functions provided ------------------------------------------------*/
-
-/* --- @skipjack_init@ --- *
- *
- * Arguments:  @skipjack_ctx *k@ = pointer to key block
- *             @const void *buf@ = pointer to key buffer
- *             @size_t sz@ = size of key material
- *
- * Returns:    ---
- *
- * Use:                Initializes a Skipjack key buffer.  The key buffer must be
- *             exactly 10 bytes long.
- */
-
-extern void skipjack_init(skipjack_ctx */*k*/,
-                         const void */*buf*/, size_t /*sz*/);
-
-/* --- @skipjack_eblk@, @skipjack_dblk@ --- *
- *
- * Arguments:  @const skipjack_ctx *k@ = pointer to key block
- *             @const uint32 s[2]@ = pointer to source block
- *             @uint32 d[2]@ = pointer to skipjacktination block
- *
- * Returns:    ---
- *
- * Use:                Low-level block encryption and decryption.
- */
-
-extern void skipjack_eblk(const skipjack_ctx */*k*/,
-                         const uint32 */*s*/, uint32 */*d*/);
-extern void skipjack_dblk(const skipjack_ctx */*k*/,
-                         const uint32 */*s*/, uint32 */*d*/);
-
-/*----- That's all, folks -------------------------------------------------*/
-
-#ifdef __cplusplus
-  }
-#endif
-
-#endif