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eac_ecdh.h
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eac_ecdh.h
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/*
* Copyright (c) 2010-2012 Frank Morgner and Dominik Oepen
*
* This file is part of OpenPACE.
*
* OpenPACE 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 3 of the License, or (at your option)
* any later version.
*
* OpenPACE 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
* OpenPACE. If not, see <http://www.gnu.org/licenses/>.
*
* Additional permission under GNU GPL version 3 section 7
*
* If you modify this Program, or any covered work, by linking or combining it
* with OpenSSL (or a modified version of that library), containing
* parts covered by the terms of OpenSSL's license, the licensors of
* this Program grant you additional permission to convey the resulting work.
* Corresponding Source for a non-source form of such a combination shall include
* the source code for the parts of OpenSSL used as well as that of the
* covered work.
*
* If you modify this Program, or any covered work, by linking or combining it
* with OpenSC (or a modified version of that library), containing
* parts covered by the terms of OpenSC's license, the licensors of
* this Program grant you additional permission to convey the resulting work.
* Corresponding Source for a non-source form of such a combination shall include
* the source code for the parts of OpenSC used as well as that of the
* covered work.
*/
/**
* @file eac_ecdh.h
* @brief Interface to elliptic curve Diffie Hellman helper functions
*
* @author Frank Morgner <[email protected]>
* @author Dominik Oepen <[email protected]>
*/
#ifndef PACE_ECDH_H_
#define PACE_ECDH_H_
#include <openssl/bn.h>
#include <openssl/buffer.h>
#include <openssl/ec.h>
#include <openssl/evp.h>
/**
* @brief initializes a key for ECDH. If the object is already initialised,
* nothing is don
*
* @param[in/out] ecdh elliptic curve object to use
* @param[in] standardizedDomainParameters specifies which parameters to use
* (see TR-03110, p. 52)
*
* @return 1 on success or 0 if an error occurred
*/
int
init_ecdh(EC_KEY ** ecdh, int standardizedDomainParameters);
/**
* @brief Generates an ECDH keypair
*
* @param[in] key
* @param[in] bn_ctx BIGNUM context
*
* @return public key of the generated keypair or NULL if an error occurred
*/
BUF_MEM *
ecdh_generate_key(EVP_PKEY *key, BN_CTX *bn_ctx);
/**
* @brief Computes an ECDH key
*
* @see PACE_STEP3B_dh_compute_key()
*/
BUF_MEM *
ecdh_compute_key(EVP_PKEY *key, const BUF_MEM * in, BN_CTX *bn_ctx);
#endif /*PACE_ECDH_H_*/