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/*
* 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.
*
* This code implements the encryption scheme from the paper:
*
* "DHAES: An Encryption Scheme Based on the Diffie-Hellman Problem"
* Michel Abdalla, Mihir Bellare, Phillip Rogaway
* September 1998
*
* \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
BEECRYPTAPI
int dhaes_pUsable(const dhaes_pParameters* params)
/*@*/;
BEECRYPTAPI
int dhaes_pContextInit (dhaes_pContext* ctxt, const dhaes_pParameters* params)
/*@modifies ctxt @*/;
BEECRYPTAPI
int dhaes_pContextInitDecrypt(dhaes_pContext* ctxt, const dhaes_pParameters* params, const mpnumber* pri)
/*@modifies ctxt @*/;
BEECRYPTAPI
int dhaes_pContextInitEncrypt(dhaes_pContext* ctxt, const dhaes_pParameters* params, const mpnumber* pub)
/*@modifies ctxt @*/;
BEECRYPTAPI
int dhaes_pContextFree (dhaes_pContext* ctxt)
/*@modifies ctxt @*/;
BEECRYPTAPI
memchunk* dhaes_pContextEncrypt(dhaes_pContext* ctxt, mpnumber* ephemeralPublicKey, mpnumber* mac, const memchunk* cleartext, randomGeneratorContext* rng)
/*@modifies ctxt, ephemeralPublicKey, mac @*/;
BEECRYPTAPI /*@null@*/
memchunk* dhaes_pContextDecrypt(dhaes_pContext* ctxt, const mpnumber* ephemeralPublicKey, const mpnumber* mac, const memchunk* ciphertext)
/*@modifies ctxt @*/;
#ifdef __cplusplus
}
#endif
#endif
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