/*
 *  Copyright 2014-2022 The GmSSL Project. All Rights Reserved.
 *
 *  Licensed under the Apache License, Version 2.0 (the License); you may
 *  not use this file except in compliance with the License.
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 */


#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 ENABLE_SECP256R1
#include <gmssl/secp256r1_key.h>
#endif
#ifdef ENABLE_SECP384R1
#include <gmssl/secp384r1_key.h>
#endif
#include <gmssl/x509_key.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);

typedef struct {
	int oid;
	union {
#ifdef ENABLE_SECP256R1
		SECP256R1_KEY secp256r1_key;
#endif
#ifdef ENABLE_SECP384R1
		SECP384R1_KEY secp384r1_key;
#endif
		int unused;
	} u;
} EC_KEY;

/*
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
}
*/
// ECPrivateKey when key->algor == OID_ec_public_key
int ec_private_key_to_der(const X509_KEY *key, int encode_params, int encode_pubkey, uint8_t **out, size_t *outlen);
int ec_private_key_from_der(X509_KEY *key, int opt_curve, const uint8_t **in, size_t *inlen);
int ec_private_key_print(FILE *fp, int fmt, int ind, const char *label, const uint8_t *d, size_t dlen); // from <gmssl/ec.h>
// X509_KEY lost some information of ECPrivateKey. so no ec_private_key_print_ex(X509_KEY)


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
