/* ====================================================================
 * Copyright (c) 2016 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 <string.h>
#include <openssl/err.h>
#include <openssl/sm9.h>
#include <openssl/bn_hash.h>
#include "sm9_lcl.h"

int SM9PrivateKey_get_gmtls_public_key(SM9PublicParameters *mpk,
	SM9PrivateKey *sk, unsigned char pub_key[1024])
{
	return 0;
}

int SM9PublicKey_get_gmtls_encoded(SM9PublicParameters *mpk,
	SM9PublicKey *pk, unsigned char encoded[1024])
{
	return 0;
}


int SM9_hash2(const EVP_MD *md, BIGNUM **r,
	const unsigned char *data, size_t datalen,
	const unsigned char *elem, size_t elemlen,
	const BIGNUM *range, BN_CTX *ctx)
{
	unsigned char *buf;

	if (!(buf = OPENSSL_malloc(datalen + elemlen))) {
		return 0;
	}
	memcpy(buf, data, datalen);
	memcpy(buf + datalen, elem, elemlen);

	if (!BN_hash_to_range(md, r, buf, datalen + elemlen, range, ctx)) {
		OPENSSL_free(buf);
		return 0;
	}

	OPENSSL_free(buf);
	return 1;
}

int SM9_DigestInit(EVP_MD_CTX *ctx, unsigned char prefix,
	const EVP_MD *md, ENGINE *impl)
{
	if (!EVP_DigestInit_ex(ctx, md, impl)
		|| !EVP_DigestUpdate(ctx, &prefix, 1)) {
		ERR_print_errors_fp(stderr);
		return 0;
	}
	return 1;
}

#if 0
int SM9_DigestFinal(EVP_MD_CTX *ctx1, BIGNUM *h, const BIGNUM *n_1)
{
	int ret = 0;
	EVP_MD_CTX *ctx2 = NULL;
	const unsigned char ct1[4] = {0x00, 0x00, 0x00, 0x01};
	const unsigned char ct2[4] = {0x00, 0x00, 0x00, 0x02};
	unsigned char Ha[EVP_MAX_MD_SIZE * 2];
	unsigned int len = 0;

	if (!(ctx2 = EVP_MD_CTX_new())
		|| !EVP_MD_CTX_copy(ctx2, ctx1)
		|| !EVP_DigestUpdate(ctx1, ct1, sizeof(ct))
		|| !EVP_DigestUpdate(ctx2, ct2, sizeof(ct2))
		|| !EVP_DigestFinal_ex(ctx1, Ha, &len)
		|| !EVP_DigestFinal_ex(ctx2, Ha + len, &len)
		|| !BN_bin2bn(Ha, 40, h)
		|| !BN_mod(h, h, n_1, bn_ctx)
		|| !BN_add_word(h, 1)) {
		ERR_print_errors_fp(stderr);
		goto end;
	}

	ret = 1;
end:
	EVP_MD_CTX_free(ctx2);
	return ret;
}
#endif