Add an internal-representation no-op function.

[u/mdw/catacomb] / oaep.h

/* -*-c-*-
 *
 * $Id: oaep.h,v 1.1 2000/07/01 11:18:30 mdw Exp $
 *
 * Optimal asymmetric encryption packing
 *
 * (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.
 */

/*----- Revision history --------------------------------------------------* 
 *
 * $Log: oaep.h,v $
 * Revision 1.1  2000/07/01 11:18:30  mdw
 * Support for Optimal Asymmetric Encryption Padding.
 *
 */

/*----- Notes on OAEP -----------------------------------------------------*
 *
 * Applying OAEP before RSA encryption renders the construction plaintext-
 * aware under the random oracle model.  This is probably a good thing.  OAEP
 * was designed by Bellare and Rogaway.  This particular variant is the one
 * specified in PKCS#1 version 2.0.  It's apparently not compatible with the
 * OAEP used in the SET protocols.
 */

#ifndef CATACOMB_OAEP_H
#define CATACOMB_OAEP_H

#ifdef __cplusplus
  extern "C" {
#endif

/*----- Header files ------------------------------------------------------*/

#include <mLib/bits.h>
#include <mLib/dstr.h>

#ifndef CATACOMB_GCIPHER_H
#  include "gcipher.h"
#endif

#ifndef CATACOMB_GHASH_H
#  include "ghash.h"
#endif

#ifndef CATACOMB_GRAND_H
#  include "grand.h"
#endif

/*----- Data structures ---------------------------------------------------*/

typedef struct oaep {
  const gccipher *cc;			/* Cipher class for masking */
  const gchash *ch;			/* Hash class for parameter block */
  grand *r;				/* Random number source */
  const void *ep;			/* Encoding parameters block */
  size_t epsz;				/* Size of the parameter block */
} oaep;

/*----- Functions provided ------------------------------------------------*/

/* --- @oaep_encode@ --- *
 *
 * Arguments:	@const void *msg@ = pointer to message data
 *		@size_t msz@ = size of message data
 *		@void *buf@ = pointer to output buffer
 *		@size_t sz@ = size of the output buffer
 *		@void *p@ = pointer to OAEP parameter block
 *
 * Returns:	Zero if all went well, negative on failure.
 *
 * Use:		Implements the operation @EME-OAEP-ENCODE@, as defined in
 *		PKCS#1 v. 2.0 (RFC2437).
 */

extern int oaep_encode(const void */*msg*/, size_t /*msz*/,
		       void */*buf*/, size_t /*sz*/, void */*p*/);

/* --- @oaep_decode@ --- *
 *
 * Arguments:	@const void *buf@ = pointer to encoded buffer
 *		@size_t sz@ = size of the encoded buffer
 *		@dstr *d@ = pointer to destination string
 *		@void *p@ = pointer to OAEP parameter block
 *
 * Returns:	The length of the output string if successful, negative on
 *		failure.
 *
 * Use:		Implements the operation @EME-OAEP-DECODE@, as defined in
 *		PKCS#1 v. 2.0 (RFC2437).
 */

extern int oaep_decode(const void */*buf*/, size_t /*sz*/,
		       dstr */*d*/, void */*p*/);

/*----- That's all, folks -------------------------------------------------*/

#ifdef __cplusplus
  }
#endif

#endif