File content as of revision 0:8918a71cdbe9:

/**
 * @file ecdh.h
 * @brief ECDH (Elliptic Curve Diffie-Hellman) key exchange
 *
 * @section License
 *
 * Copyright (C) 2010-2017 Oryx Embedded SARL. All rights reserved.
 *
 * This file is part of CycloneCrypto Open.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * @author Oryx Embedded SARL (www.oryx-embedded.com)
 * @version 1.7.6
 **/

#ifndef _ECDH_H
#define _ECDH_H

//Dependencies
#include "crypto.h"
#include "ec.h"


/**
 * @brief ECDH context
 **/

typedef struct
{
   EcDomainParameters params; //EC domain parameters
   Mpi da;                    ///<One's own private key
   EcPoint qa;                ///<One's own public key
   EcPoint qb;                ///<Peer's public key
} EcdhContext;


//ECDH related functions
void ecdhInit(EcdhContext *context);
void ecdhFree(EcdhContext *context);

error_t ecdhGenerateKeyPair(EcdhContext *context,
   const PrngAlgo *prngAlgo, void *prngContext);

error_t ecdhCheckPublicKey(const EcDomainParameters *params, EcPoint *publicKey);

error_t ecdhComputeSharedSecret(EcdhContext *context,
   uint8_t *output, size_t outputSize, size_t *outputLength);

#endif