ecdh.h

00001 /**
00002  * @file ecdh.h
00003  * @brief ECDH (Elliptic Curve Diffie-Hellman) key exchange
00004  *
00005  * @section License
00006  *
00007  * Copyright (C) 2010-2017 Oryx Embedded SARL. All rights reserved.
00008  *
00009  * This file is part of CycloneCrypto Open.
00010  *
00011  * This program is free software; you can redistribute it and/or
00012  * modify it under the terms of the GNU General Public License
00013  * as published by the Free Software Foundation; either version 2
00014  * of the License, or (at your option) any later version.
00015  *
00016  * This program is distributed in the hope that it will be useful,
00017  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00018  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00019  * GNU General Public License for more details.
00020  *
00021  * You should have received a copy of the GNU General Public License
00022  * along with this program; if not, write to the Free Software Foundation,
00023  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
00024  *
00025  * @author Oryx Embedded SARL (www.oryx-embedded.com)
00026  * @version 1.7.6
00027  **/
00028 
00029 #ifndef _ECDH_H
00030 #define _ECDH_H
00031 
00032 //Dependencies
00033 #include "crypto.h"
00034 #include "ec.h"
00035 
00036 
00037 /**
00038  * @brief ECDH context
00039  **/
00040 
00041 typedef struct
00042 {
00043    EcDomainParameters params; //EC domain parameters
00044    Mpi da;                    ///<One's own private key
00045    EcPoint qa;                ///<One's own public key
00046    EcPoint qb;                ///<Peer's public key
00047 } EcdhContext;
00048 
00049 
00050 //ECDH related functions
00051 void ecdhInit(EcdhContext *context);
00052 void ecdhFree(EcdhContext *context);
00053 
00054 error_t ecdhGenerateKeyPair(EcdhContext *context,
00055    const PrngAlgo *prngAlgo, void *prngContext);
00056 
00057 error_t ecdhCheckPublicKey(const EcDomainParameters *params, EcPoint *publicKey);
00058 
00059 error_t ecdhComputeSharedSecret(EcdhContext *context,
00060    uint8_t *output, size_t outputSize, size_t *outputLength);
00061 
00062 #endif
00063