/*
 * Copyright (c) 2000, 2001, 2002 Virtual Unlimited, B.V.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

/*!\file dhaes.h
 * \brief DHAES encryption scheme, headers.
 * \author Bob Deblier <bob.deblier@pandora.be>
 * \ingroup DL_m DL_dh_m
 */

#ifndef _DHAES_H
#define _DHAES_H
 
#include "beecrypt.h"
#include "dldp.h"

/**
 */
typedef struct
{
	const dldp_p*			param;
	const hashFunction*		hash;
	const blockCipher*		cipher;
	const keyedHashFunction*	mac;
	size_t				cipherkeybits;
	size_t				mackeybits;
} dhaes_pParameters;

/**
 */
typedef struct
{
	dldp_p				param;
	mpnumber			pub;
	mpnumber			pri;
	hashFunctionContext		hash;
	blockCipherContext		cipher;
	keyedHashFunctionContext	mac;
	size_t				cipherkeybits;
	size_t				mackeybits;
} dhaes_pContext;

#ifdef __cplusplus
extern "C" {
#endif

/**
 */
/*@-exportlocal@*/
BEECRYPTAPI
int dhaes_pUsable(const dhaes_pParameters* params)
	/*@*/;
/*@=exportlocal@*/

/**
 */
/*@-exportlocal@*/
BEECRYPTAPI
int dhaes_pContextInit       (/*@special@*/ dhaes_pContext* ctxt, const dhaes_pParameters* params)
	/*@defines ctxt->hash, ctxt->cipher, ctxt->mac @*/
	/*@modifies ctxt @*/;
/*@=exportlocal@*/

/**
 */
BEECRYPTAPI /*@unused@*/
int dhaes_pContextInitDecrypt(dhaes_pContext* ctxt, const dhaes_pParameters* params, const mpnumber* pri)
	/*@modifies ctxt @*/;

/**
 */
BEECRYPTAPI /*@unused@*/
int dhaes_pContextInitEncrypt(dhaes_pContext* ctxt, const dhaes_pParameters* params, const mpnumber* pub)
	/*@modifies ctxt @*/;

/**
 */
BEECRYPTAPI /*@unused@*/
int dhaes_pContextFree       (/*@only@*/ dhaes_pContext* ctxt)
	/*@modifies ctxt @*/;

/**
 */
BEECRYPTAPI /*@only@*/ /*@null@*/ /*@unused@*/
memchunk* dhaes_pContextEncrypt(dhaes_pContext* ctxt,       mpnumber* ephemeralPublicKey,       mpnumber* mac, const memchunk* cleartext, randomGeneratorContext* rng)
	/*@modifies ctxt, ephemeralPublicKey, mac, rng @*/;

/**
 */
BEECRYPTAPI /*@only@*/ /*@null@*/ /*@unused@*/
memchunk* dhaes_pContextDecrypt(dhaes_pContext* ctxt, const mpnumber* ephemeralPublicKey, const mpnumber* mac, const memchunk* ciphertext)
	/*@modifies ctxt @*/;

#ifdef __cplusplus
}
#endif

#endif