/*
 * Copyright (c) 2014 - 2021 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.
 */

#ifndef GMSSL_EC_H
#define GMSSL_EC_H


#include <time.h>
#include <string.h>
#include <stdint.h>
#include <stdlib.h>
#include <gmssl/sm2.h>
#include <gmssl/oid.h>
#include <gmssl/asn1.h>

#ifdef __cplusplus
extern "C" {
#endif

/*
NamedCurve:
	OID_sm2
	OID_prime192v1
	OID_prime256v1
	OID_secp256k1
	OID_secp384r1
	OID_secp521r1
*/
const char *ec_named_curve_name(int curve);
int ec_named_curve_from_name(const char *name);
int ec_named_curve_to_der(int curve, uint8_t **out, size_t *outlen);
int ec_named_curve_from_der(int *curve, const uint8_t **in, size_t *inlen);

/*
ECPoint ::= OCTET STRING -- uncompressed point
*/
int ec_point_print(FILE *fp, int fmt, int ind, const char *label, const uint8_t *d, size_t dlen);

/*
ECPrivateKey ::= SEQUENCE {
	version		INTEGER,	-- value MUST be (1)
	privateKey	OCTET STRING,	-- big endian encoding of integer
	parameters	[0] EXPLICIT OBJECT IDENTIFIER OPTIONAL, -- namedCurve
	publicKey	[1] EXPLICIT BIT STRING OPTIONAL -- ECPoint
}
*/

enum {
	EC_private_key_version = 1,
};

int ec_private_key_print(FILE *fp, int fmt, int ind, const char *label, const uint8_t *d, size_t dlen);

#ifdef __cplusplus
}
#endif
#endif