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[u/mdw/catacomb] / rc2.h

diff --git a/rc2.h b/rc2.h
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-/* -*-c-*-
- *
- * $Id: rc2.h,v 1.2 2004/04/08 01:36:15 mdw Exp $
- *
- * The RC2 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 RC2 block cipher -------------------------------------*
- *
- * RC2 was designed by Ron Rivest, and for a long time was a trade secret of
- * RSA Data Security Inc.  Like RC4, it leaked out, and has now been
- * described in RFC2268.  The RC2 key schedule is known to have some
- * weaknesses, although I'm not aware of any major results against the cipher
- * itself.  I'm also not aware of any legal problems with using the RC2
- * cipher.
- *
- * The oddest feature in the cipher is the key schedule.  It expands the
- * initial key material to 128 bytes, and then `brain-damages' it, according
- * to a supplied `effective key-bits' parameter, before expanding the
- * remaining key material back into the buffer.
- *
- * The key schedule allows second preimages to be computed trivially.
- */
-
-#ifndef CATACOMB_RC2_H
-#define CATACOMB_RC2_H
-
-#ifdef __cplusplus
-  extern "C" {
-#endif
-
-/*----- Header files ------------------------------------------------------*/
-
-#include <stddef.h>
-
-#include <mLib/bits.h>
-
-/*----- Magical numbers ---------------------------------------------------*/
-
-#define RC2_BLKSZ 8
-#define RC2_KEYSZ 16
-#define RC2_CLASS (N, L, 64)
-
-extern const octet rc2_keysz[];
-
-/*----- Data structures ---------------------------------------------------*/
-
-typedef struct rc2_ctx {
-  uint16 k[64];
-} rc2_ctx;
-
-/*----- Functions provided ------------------------------------------------*/
-
-/* --- @rc2_braindamage@ --- *
- *
- * Arguments:  @rc2_ctx *k@ = pointer to context to initialize
- *             @const void *buf@ = pointer to key material
- *             @size_t sz@ = size of key material in bytes
- *             @unsigned eb@ = desired effective key size, in bits
- *
- * Returns:    ---
- *
- * Use:                Initializes an RC2 expanded key, and braindamages it to the
- *             requested effective key size.  This is here for compatibility
- *             reasons.  You should be using @rc2_init@ in normal code,
- *             which doesn't actually apply braindamage.
- */
-
-extern void rc2_braindamage(rc2_ctx */*k*/, const void */*buf*/,
-                           size_t /*sz*/, unsigned /*eb*/);
-
-/* --- @rc2_init@ --- *
- *
- * Arguments:  @rc2_ctx *k@ = pointer to context to initialize
- *             @const void *buf@ = pointer to key material
- *             @size_t sz@ = size of key material in bytes
- *
- * Returns:    ---
- *
- * Use:                Initializes an RC2 expanded key.  The effective key size is
- *             set to be equal to the real key size, in bits.
- */
-
-extern void rc2_init(rc2_ctx */*k*/, const void */*buf*/, size_t /*sz*/);
-
-/* --- @rc2_eblk@, @rc2_dblk@ --- *
- *
- * Arguments:  @const rc2_ctx *k@ = pointer to RC2 context
- *             @const uint32 s[2]@ = pointer to source block
- *             @const uint32 d[2]@ = pointer to destination block
- *
- * Returns:    ---
- *
- * Use:                Low-level block encryption and decryption.
- */
-
-extern void rc2_eblk(const rc2_ctx */*k*/,
-                    const uint32 */*s*/, uint32 */*dst*/);
-extern void rc2_dblk(const rc2_ctx */*k*/,
-                    const uint32 */*s*/, uint32 */*dst*/);
-
-/*----- That's all, folks -------------------------------------------------*/
-
-#ifdef __cplusplus
-  }
-#endif
-
-#endif