/* crypto/sm2/sm2_asn1.c */
/* ====================================================================
 * Copyright (c) 2007 - 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.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    distribution.
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 * 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
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 *    guanzhi1980@gmail.com.
 *
 * 5. Products derived from this software may not be called "GmSSL"
 *    nor may "GmSSL" appear in their names without prior written
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 * 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,
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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 * ====================================================================
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 */

#include <string.h>
#include <openssl/err.h>
#include <openssl/asn1.h>
#include <openssl/asn1t.h>
#include <openssl/objects.h>
#include <openssl/obj_mac.h>
#include <openssl/sm2.h>

/*
 * from GM/T 0009-2012
 * "SM2 Cryptography Algorithm Application Specification"
 *

SM2PrivateKey ::= INTEGER

SM2PublicKey ::= BIT STRING

SM2CiphertextValue ::= SEQUENCE {
	XCoordinate	INTEGER,
	YCoordinate	INTEGER,
	Hash		OCTET STRING SIZE(32),
	Ciphertext	OCTET STRING
}

SM2Signature ::= SEQUENCE {
	R		INTEGER,
	S		INTEGER,
}

SM2EnvelopedKey ::= SEQUENCE {
	symAlgID	AlgorithmIdentifier,
	symEncryptedKey	SM2CiphertextValue,
	sm2PublicKey	SM2PublicKey,
	sm2EncryptedPrivateKey	BIT STRING
}

ZID = SM3(nbits(ID)||ID||a||b||xG||yG||xA||yA)

Default ID = "1234567812345678"

*/

#if 0
typedef struct SM2CiphertextValue_st {
	ASN1_INTEGER *xCoordinate;
	ASN1_INTEGER *yCoordinate;
	ASN1_OCTET_STRING *hash;
	ASN1_OCTET_STRING *ciphertext;
} SM2CiphertextValue;

ASN1_SEQUENCE(SM2CiphertextValue) = {
	ASN1_SIMPLE(SM2CiphertextValue, xCoordinate, ASN1_INTEGER),
	ASN1_SIMPLE(SM2CiphertextValue, yCoordinate, ASN1_INTEGER),
	ASN1_SIMPLE(SM2CiphertextValue, hash, ASN1_OCTET_STRING),
	ASN1_SIMPLE(SM2CiphertextValue, ciphertext, ASN1_OCTET_STRING),
} ASN1_SEQUENCE_END(SM2CiphertextValue)
IMPLEMENT_ASN1_FUNCTIONS(SM2CiphertextValue)
IMPLEMENT_ASN1_DUP_FUNCTION(SM2CiphertextValue)

typedef struct SM2EnvelopedKey_st {
	ASN1_ALGOR *symAlgID;
	SM2CiphertextValue *symEncryptedKey;
	ASN1_OCTET_STRING *sm2PublicKey;
	ASN1_BIT_STRING *sm2EncryptedPrivateKey;
} SM2EnvelopedKey;

/* GmSSL specific */
ASN1_SEQUENCE(SM2_CIPHERTEXT_VALUE_ASN1) = {
	ASN1_SIMPLE(SM2_CIPHERTEXT_VALUE_ASN1, ephem_point, ASN1_OCTET_STRING),
	ASN1_SIMPLE(SM2_CIPHERTEXT_VALUE_ASN1, ciphertext, ASN1_OCTET_STRING),
	ASN1_SIMPLE(SM2_CIPHERTEXT_VALUE_ASN1, mactag, ASN1_OCTET_STRING)
} ASN1_SEQUENCE_END(SM2_CIPHERTEXT_VALUE)
IMPLEMENT_ASN1_FUNCTIONS(SM2_CIPHERTEXT_VALUE_ASN1)
IMPLEMENT_ASN1_DUP_FUNCTION(SM2_CIPHERTEXT_VALUE_ASN1)


int i2d_SM2_CIPHERTEXT_VALUE(const SM2_CIPHERTEXT_VALUE *c, unsigned char **out)
{
	int ret = 0;
	SM2CiphertextValue *asn1 = NULL;
	BIGNUM *x = NULL;
	BIGNUM *y = NULL;


	if (!(asn1 = SM2CiphertextValue_new())) {
		goto end;
	}
	OPENSSL_assert(asn1->xCoordinate);
	OPENSSL_assert(asn1->yCoordinate);
	if (!BN_to_ASN1_INTEGER(x, asn1->xCoordinate)) {
	}

	if (!BN_to_ASN1_INTEGER(y, asn1->yCoordinate)) {
	}

	M_ASN1_OCTET_STRING_set(asn1->hash, c->mactag, c->mactag_size);
	M_ASN1_OCTET_STRING_set(asn1->ciphertext, c->ciphertext, c->ciphertext_size);

	ret = 1;
end:
	return ret;
}

SM2_CIPHERTEXT_VALUE *d2i_SM2_CIPHERTEXT_VALUE(SM2_CIPHERTEXT_VALUE **c,
	const unsigned char **in, long len)
{
	




	return NULL;
}
#endif