/* ====================================================================
 * Copyright (c) 2007 - 2017 The GmSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the GmSSL Project.
 *    (http://gmssl.org/)"
 *
 * 4. The name "GmSSL Project" must not be used to endorse or promote
 *    products derived from this software without prior written
 *    permission. For written permission, please contact
 *    guanzhi1980@gmail.com.
 *
 * 5. Products derived from this software may not be called "GmSSL"
 *    nor may "GmSSL" appear in their names without prior written
 *    permission of the GmSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the GmSSL Project
 *    (http://gmssl.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE GmSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE GmSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/rand.h>
#include <openssl/ecies.h>

static int ECIES_PARAMS_init_with_type(ECIES_PARAMS *params, int type)
{
			
	return 0;
}

int gmssl_ecies_encrypt(int type, const unsigned char *in, size_t inlen,
	unsigned char *out, size_t *outlen, EC_KEY *ec_key)
{
	ECIES_CIPHERTEXT_VALUE *cv = NULL;
	ECIES_PARAMS params;

	if (!ECIES_PARAMS_init_with_type(&params, type)) {
		return 0;
	}

	RAND_seed(in, inlen);
	if (!(cv = ECIES_do_encrypt(&params, in, inlen, ec_key))) {
		*outlen = 0;
		return 0;
	}

	*outlen = i2d_ECIES_CIPHERTEXT_VALUE(cv, &out);
	ECIES_CIPHERTEXT_VALUE_free(cv);
	return 1;
}

int gmssl_ecies_decrypt(int type, const unsigned char *in, size_t inlen,
	unsigned char *out, size_t *outlen, EC_KEY *ec_key)
{
	ECIES_CIPHERTEXT_VALUE *cv = NULL;
	ECIES_PARAMS params;
	const unsigned char *cp = in;
	unsigned char *der = NULL;
	int derlen = -1;
	int ret = -1;

	if (!ECIES_PARAMS_init_with_type(&params, type)) {
		return -1;
	}

	if (!(cv = d2i_ECIES_CIPHERTEXT_VALUE(NULL, &cp, inlen))) {
		return -1;
	}

	derlen = i2d_ECIES_CIPHERTEXT_VALUE(cv, &der);
	if (derlen != inlen || memcmp(in, der, derlen) != 0) {
		goto end;
	}

	ret = ECIES_do_decrypt(&params, cv, out, outlen, ec_key);

end:
	OPENSSL_clear_free(der, derlen);
	ECIES_CIPHERTEXT_VALUE_free(cv);
	return ret;
}

ECIES_CIPHERTEXT_VALUE *gmssl_ecies_do_encrypt(int type, const unsigned char *in,
                                              size_t inlen, EC_KEY *ec_key)
{
	ECIES_PARAMS param;
	ECIES_PARAMS_init_with_recommended(&param);
	return ECIES_do_encrypt(&param, in, inlen, ec_key);
}

int gmssl_ecies_do_decrypt(int type, const ECIES_CIPHERTEXT_VALUE *in,
	unsigned char *out, size_t *outlen, EC_KEY *ec_key)
{
	ECIES_PARAMS param;
	ECIES_PARAMS_init_with_recommended(&param);
	return ECIES_do_decrypt(&param, in, out, outlen, ec_key);
}