/*
 *  Copyright 2014-2026 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_X509_CER_H
#define GMSSL_X509_CER_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>
#include <gmssl/x509_key.h>

#ifdef __cplusplus
extern "C" {
#endif


enum X509_Version {
	X509_version_v1 = 0,
	X509_version_v2 = 1,
	X509_version_v3 = 2,
};

const char *x509_version_name(int version);
int x509_explicit_version_to_der(int index, int version, uint8_t **out, size_t *outlen);
int x509_explicit_version_from_der(int index, int *version, const uint8_t **in, size_t *inlen);

/*
Time ::= CHOICE {
	utcTime		UTCTime,
	generalTime	GeneralizedTime }
*/
#define X509_MAX_UTC_TIME            2524607999 // "20491231235959Z"
#define X509_MAX_GENERALIZED_TIME  253402300799 // "99991231235959Z"
int x509_time_to_der(time_t a, uint8_t **out, size_t *outlen);
int x509_time_from_der(time_t *a, const uint8_t **in, size_t *inlen);

/*
Validity ::= SEQUENCE {
	notBefore	Time,
	notAfter	Time }
*/
#define X509_VALIDITY_MIN_DAYS 1
#define X509_VALIDITY_MAX_DAYS 3653
#define X509_VALIDITY_MAX_SECONDS (X509_VALIDITY_MAX_DAYS * 86400)
int x509_validity_add_days(time_t *not_after, time_t not_before, int days);
int x509_validity_to_der(time_t not_before, time_t not_after, uint8_t **out, size_t *outlen);
int x509_validity_from_der(time_t *not_before, time_t *not_after, const uint8_t **in, size_t *inlen);
int x509_validity_check(time_t not_before, time_t not_after, time_t now, int max_secs);
int x509_validity_print(FILE *fp, int fmt, int ind, const char *label, const uint8_t *d, size_t dlen);

/*
DirectoryString or DirectoryName

DirectoryName ::= CHOICE {
	teletexString		TeletexString	(SIZE (1..MAX)),
	printableString		PrintableString	(SIZE (1..MAX)),
	universalString		UniversalString	(SIZE (1..MAX)),
	utf8String		UTF8String	(SIZE (1..MAX)),
	bmpString		BMPString	(SIZE (1..MAX)),
}
*/
int x509_directory_name_check(int tag, const uint8_t *d, size_t dlen);
int x509_directory_name_check_ex(int tag, const uint8_t *d, size_t dlen, size_t minlen, size_t maxlen);
int x509_directory_name_to_der(int tag, const uint8_t *d, size_t dlen, uint8_t **out, size_t *outlen);
int x509_directory_name_from_der(int *tag, const uint8_t **d, size_t *dlen, const uint8_t **in, size_t *inlen);
int x509_explicit_directory_name_to_der(int index, int tag, const uint8_t *d, size_t dlen, uint8_t **out, size_t *outlen);
int x509_explicit_directory_name_from_der(int index, int *tag, const uint8_t **d, size_t *dlen, const uint8_t **in, size_t *inlen);
int x509_directory_name_print(FILE *fp, int fmt, int ind, const char *label, int tag, const uint8_t *d, size_t dlen);

/*
AttributeTypeAndValue ::= SEQUENCE {
	type OBJECT IDENTIFIER,
	value ANY -- DEFINED BY AttributeType }

id-at
	OID_at_name			name			DirectoryName		1..ub-name
	OID_at_surname			surname			DirectoryName		1..ub-name
	OID_at_given_name		givenName		DirectoryName		1..ub-name
	OID_at_initials			initials		DirectoryName		1..ub-name
	OID_at_generation_qualifier	generationQualifier	DirectoryName		1..ub-name
	OID_at_common_name		commonName		DirectoryName		1..ub-common-name
	OID_at_locality_name		localityName		DirectoryName		1..ub-locality-name
	OID_at_state_or_province_name	stateOrProvinceName	DirectoryName		1..ub-state-name
	OID_at_organization_name	organizationName	DirectoryName		1..ub-organization-name
	OID_at_organizational_unit_name	organizationalUnitName	DirectoryName		1..ub-organizational-unit-name
	OID_at_title			title			DirectoryName		1..ub-title
	OID_at_dn_qualifier		dnQualifier		PrintableString		N/A
	OID_at_country_name		countryName		PrintableString		2..2
	OID_at_serial_number		serialNumber		PrintableString		1..ub-serial-number
	OID_at_pseudonym		pseudonym		DirectoryName		1..ub-pseudonym
	OID_domain_component		domainComponent		IA5String		N/A
*/
const char *x509_name_type_name(int oid);
int x509_name_type_from_name(const char *name);
int x509_name_type_from_der(int *oid, const uint8_t **in, size_t *inlen);
int x509_name_type_to_der(int oid, uint8_t **out, size_t *outlen);

#define X509_ub_name 32768
#define X509_ub_common_name 64
#define X509_ub_locality_name 128
#define X509_ub_state_name 128
#define X509_ub_organization_name 64
#define X509_ub_organizational_unit_name 64
#define X509_ub_title 64
#define X509_ub_serial_number 64
#define X509_ub_pseudonym 128

int x509_attr_type_and_value_check(int oid, int tag, const uint8_t *val, size_t vlen);
int x509_attr_type_and_value_to_der(int oid, int tag, const uint8_t *val, size_t vlen, uint8_t **out, size_t *outlen);
int x509_attr_type_and_value_from_der(int *oid, int *tag, const uint8_t **val, size_t *vlen, const uint8_t **in, size_t *inlen);
int x509_attr_type_and_value_print(FILE *fp, int fmt, int ind, const char *label, const uint8_t *d, size_t dlen);

/*
RelativeDistinguishedName ::= SET SIZE (1..MAX) OF AttributeTypeAndValue
*/
int x509_rdn_to_der(int oid, int tag, const uint8_t *val, size_t vlen, const uint8_t *more, size_t mlen, uint8_t **out, size_t *outlen);
int x509_rdn_from_der(int *oid, int *tag, const uint8_t **val, size_t *vlen, const uint8_t **more, size_t *mlen, const uint8_t **in, size_t *inlen);
int x509_rdn_check(const uint8_t *d, size_t dlen);
int x509_rdn_print(FILE *fp, int fmt, int ind, const char *label, const uint8_t *d, size_t dlen);

/*
Name ::= SEQUENCE OF RelativeDistinguishedName
*/
int x509_name_add_rdn(uint8_t *d, size_t *dlen, size_t maxlen, int oid, int tag, const uint8_t *val, size_t vlen, const uint8_t *more, size_t mlen);
int x509_name_add_country_name(uint8_t *d, size_t *dlen, size_t maxlen, const char val[2] ); // val: PrintableString SIZE(2)
int x509_name_add_state_or_province_name(uint8_t *d, size_t *dlen, size_t maxlen, int tag, const uint8_t *val, size_t vlen);
int x509_name_add_locality_name(uint8_t *d, size_t *dlen, size_t maxlen, int tag, const uint8_t *val, size_t vlen);
int x509_name_add_organization_name(uint8_t *d, size_t *dlen, size_t maxlen, int tag, const uint8_t *val, size_t vlen);
int x509_name_add_organizational_unit_name(uint8_t *d, size_t *dlen, size_t maxlen, int tag, const uint8_t *val, size_t vlen);
int x509_name_add_common_name(uint8_t *d, size_t *dlen, size_t maxlen, int tag, const uint8_t *val, size_t vlen);
int x509_name_add_domain_component(uint8_t *d, size_t *dlen, size_t maxlen, const char *val, size_t vlen); // val: IA5String

int x509_name_set(uint8_t *d, size_t *dlen, size_t maxlen,
	const char country[2], const char *state, const char *locality,
	const char *org, const char *org_unit, const char *common_name);

#define x509_name_to_der(d,dlen,out,outlen) asn1_sequence_to_der(d,dlen,out,outlen)
#define x509_name_from_der(d,dlen,in,inlen) asn1_sequence_from_der(d,dlen,in,inlen)
int x509_name_check(const uint8_t *d, size_t dlen);
int x509_name_print(FILE *fp, int fmt, int ind, const char *label, const uint8_t *d, size_t dlen);
int x509_name_get_value_by_type(const uint8_t *d, size_t dlen, int oid, int *tag, const uint8_t **val, size_t *vlen);
int x509_name_get_common_name(const uint8_t *d, size_t dlen, int *tag, const uint8_t **val, size_t *vlen);
int x509_name_equ(const uint8_t *a, size_t alen, const uint8_t *b, size_t blen);

int x509_names_print(FILE *fp, int fmt, int ind, const char *label, const uint8_t *d, size_t dlen);


/*
Extension  ::=  SEQUENCE  {
	extnID OBJECT IDENTIFIER,
	critical BOOLEAN DEFAULT FALSE,
	extnValue OCTET STRING -- contains the DER encoding of an ASN.1 value

id-ce:
	OID_ce_authority_key_identifier
	OID_ce_subject_key_identifier
	OID_ce_key_usage
	OID_ce_certificate_policies
	OID_ce_policy_mappings
	OID_ce_subject_alt_name
	OID_ce_issuer_alt_name
	OID_ce_subject_directory_attributes
	OID_ce_basic_constraints
	OID_ce_name_constraints
	OID_ce_policy_constraints
	OID_ce_ext_key_usage
	OID_ce_crl_distribution_points
	OID_ce_inhibit_any_policy
	OID_ce_freshest_crl
	OID_netscape_cert_comment
*/
const char *x509_ext_id_name(int oid);
int x509_ext_id_from_name(const char *name);
int x509_ext_id_from_der(int *oid, uint32_t *nodes, size_t *nodes_count, const uint8_t **in, size_t *inlen);
int x509_ext_id_to_der(int oid, uint8_t **out, size_t *outlen);

int x509_ext_to_der(int oid, int critical, const uint8_t *val, size_t vlen, uint8_t **out, size_t *outlen);
int x509_ext_from_der(int *oid, uint32_t *nodes, size_t *nodes_cnt, int *critical, const uint8_t **val, size_t *vlen, const uint8_t **in, size_t *inlen);
int x509_ext_print(FILE *fp, int fmt, int ind, const char *label, const uint8_t *d, size_t dlen);

/*
[3] EXPLICIT SEQUENCE OF Extension
 */
int x509_explicit_exts_to_der(int index, const uint8_t *d, size_t dlen, uint8_t **out, size_t *outlen);
int x509_explicit_exts_from_der(int index, const uint8_t **d, size_t *dlen, const uint8_t **in, size_t *inlen);
#define x509_exts_to_der(d,dlen,out,outlen) x509_explicit_exts_to_der(3,d,dlen,out,outlen)
#define x509_exts_from_der(d,dlen,in,inlen) x509_explicit_exts_from_der(3,d,dlen,in,inlen)

int x509_exts_get_ext_by_oid(const uint8_t *d, size_t dlen, int oid,
	int *critical, const uint8_t **val, size_t *vlen);
int x509_exts_print(FILE *fp, int fmt, int ind, const char *label, const uint8_t *d, size_t dlen);

/*
TBSCertificate ::= SEQUENCE {
	version			[0] EXPLICIT INTEGER DEFAULT v1,
	serialNumber		INTEGER,
	siganture		AlgorithmIdentifier,
	issuer			Name,
	validity		Validity,
	subject			Name,
	subjectPulbicKeyInfo	SubjectPublicKeyInfo,
	issuerUniqueID		[1] IMPLICIT BIT STRING OPTIONAL, -- If present, must be v2,v3
	subjectUniqueID		[2] IMPLICIT BIT STRING OPTIONAL, -- If present, must be v2,v3
	extensions		[3] EXPLICIT Extensions OPTIONAL  -- If present, must be v3 }
*/
#define X509_SERIAL_NUMBER_MIN_LEN	1
#define X509_SERIAL_NUMBER_MAX_LEN	20
#define X509_UNIQUE_ID_MIN_LEN 		32
#define X509_UNIQUE_ID_MAX_LEN 		32

int x509_tbs_cert_to_der(
	int version,
	const uint8_t *serial, size_t serial_len,
	int signature_algor,
	const uint8_t *issuer, size_t issuer_len,
	time_t not_before, time_t not_after,
	const uint8_t *subject, size_t subject_len,
	const X509_KEY *subject_public_key,
	const uint8_t *issuer_unique_id, size_t issuer_unique_id_len,
	const uint8_t *subject_unique_id, size_t subject_unique_id_len,
	const uint8_t *exts, size_t exts_len,
	uint8_t **out, size_t *outlen);
int x509_tbs_cert_from_der(
	int *version,
	const uint8_t **serial, size_t *serial_len,
	int *signature_algor,
	const uint8_t **issuer, size_t *issuer_len,
	time_t *not_before, time_t *not_after,
	const uint8_t **subject, size_t *subject_len,
	X509_KEY *subject_public_key,
	const uint8_t **issuer_unique_id, size_t *issuer_unique_id_len,
	const uint8_t **subject_unique_id, size_t *subject_unique_id_len,
	const uint8_t **exts, size_t *exts_len,
	const uint8_t **in, size_t *inlen);
int x509_tbs_cert_print(FILE *fp, int fmt, int ind, const char *label, const uint8_t *d, size_t dlen);

/*
Certificate  ::=  SEQUENCE  {
	tbsCertificate       TBSCertificate,
	signatureAlgorithm   AlgorithmIdentifier,
	signatureValue       BIT STRING }
*/
int x509_certificate_to_der(
	const uint8_t *tbs, size_t tbslen,
	int signature_algor,
	const uint8_t *sig, size_t siglen,
	uint8_t **out, size_t *outlen);
int x509_certificate_from_der(
	const uint8_t **tbs, size_t *tbslen,
	int *signature_algor,
	const uint8_t **sig, size_t *siglen,
	const uint8_t **in, size_t *inlen);

int x509_signed_from_der(
	const uint8_t **tbs, size_t *tbslen,
	int *signature_algor,
	const uint8_t **sig, size_t *siglen,
	const uint8_t **in, size_t *inlen);
int x509_signed_verify(const uint8_t *a, size_t alen, const X509_KEY *pub_key,
	const char *signer_id, size_t signer_id_len);
int x509_signed_verify_by_ca_cert(const uint8_t *a, size_t alen, const uint8_t *cacert, size_t cacertlen,
	const char *signer_id, size_t signer_id_len);

// x509_cert functions
int x509_cert_sign_to_der(
	int version,
	const uint8_t *serial, size_t serial_len,
	int signature_algor,
	const uint8_t *issuer, size_t issuer_len,
	time_t not_before, time_t not_after,
	const uint8_t *subject, size_t subject_len,
	const X509_KEY *subject_public_key,
	const uint8_t *issuer_unique_id, size_t issuer_unique_id_len,
	const uint8_t *subject_unique_id, size_t subject_unique_id_len,
	const uint8_t *exts, size_t exts_len,
	X509_KEY *sign_key, const char *signer_id, size_t signer_id_len,
	uint8_t **out, size_t *outlen);

int x509_cert_to_der(const uint8_t *a, size_t alen, uint8_t **out, size_t *outlen);
int x509_cert_from_der(const uint8_t **a, size_t *alen, const uint8_t **in, size_t *inlen);
int x509_cert_to_pem(const uint8_t *a, size_t alen, FILE *fp);
int x509_cert_from_pem(uint8_t *a, size_t *alen, size_t maxlen, FILE *fp);
int x509_cert_from_pem_by_subject(uint8_t *a, size_t *alen, size_t maxlen, const uint8_t *name, size_t namelen, FILE *fp);
int x509_cert_print(FILE *fp, int fmt, int ind, const char *label, const uint8_t *a, size_t alen);

int x509_cert_verify_by_ca_cert(const uint8_t *a, size_t alen, const uint8_t *cacert, size_t cacertlen,
	const char *signer_id, size_t signer_id_len);

int x509_cert_get_details(const uint8_t *a, size_t alen,
	int *version,
	const uint8_t **serial_number, size_t *serial_number_len,
	int *inner_signature_algor,
	const uint8_t **issuer, size_t *issuer_len,
	time_t *not_before, time_t *not_after,
	const uint8_t **subject, size_t *subject_len,
	X509_KEY *subject_public_key,
	const uint8_t **issuer_unique_id, size_t *issuer_unique_id_len,
	const uint8_t **subject_unique_id, size_t *subject_unique_id_len,
	const uint8_t **extensions, size_t *extensions_len,
	int *signature_algor,
	const uint8_t **signature, size_t *signature_len);


typedef enum {
	X509_cert_server_auth,
	X509_cert_client_auth,
	X509_cert_server_key_encipher,
	X509_cert_client_key_encipher,
	X509_cert_ca,
	X509_cert_root_ca,
	X509_cert_crl_sign,
} X509_CERT_TYPE;

int x509_cert_check(const uint8_t *cert, size_t certlen, int cert_type, int *path_len_constraint);

/*
IssuerAndSerialNumber ::= SEQUENCE {
	isser		Name,
	serialNumber	INTEGER }
*/
int x509_cert_get_issuer_and_serial_number(const uint8_t *a, size_t alen,
	const uint8_t **issuer, size_t *issuer_len,
	const uint8_t **serial_number, size_t *serial_number_len);
int x509_cert_get_issuer(const uint8_t *a, size_t alen, const uint8_t **name, size_t *namelen);
int x509_cert_get_subject(const uint8_t *a, size_t alen, const uint8_t **subj, size_t *subj_len);
int x509_cert_get_subject_public_key(const uint8_t *a, size_t alen, X509_KEY *public_key);
int x509_cert_get_exts(const uint8_t *a, size_t alen, const uint8_t **d, size_t *dlen);

int x509_certs_to_pem(const uint8_t *d, size_t dlen, FILE *fp);
int x509_certs_from_pem(uint8_t *d, size_t *dlen, size_t maxlen, FILE *fp);
int x509_certs_get_count(const uint8_t *d, size_t dlen, size_t *cnt);
int x509_certs_get_cert_by_index(const uint8_t *d, size_t dlen, int index, const uint8_t **cert, size_t *certlen);
int x509_certs_get_cert_by_subject(const uint8_t *d, size_t dlen, const uint8_t *subject, size_t subject_len, const uint8_t **cert, size_t *certlen);
int x509_certs_get_last(const uint8_t *d, size_t dlen, const uint8_t **cert, size_t *certlen);

int x509_certs_get_cert_by_subject_and_key_identifier(const uint8_t *d, size_t dlen,
	const uint8_t *subject, size_t subject_len,
	const uint8_t *key_id, size_t key_id_len,
	const uint8_t **cert, size_t *certlen);
int x509_certs_get_cert_by_issuer_and_serial_number(
	const uint8_t *certs, size_t certs_len,
	const uint8_t *issuer, size_t issuer_len,
	const uint8_t *serial, size_t serial_len,
	const uint8_t **cert, size_t *cert_len);

typedef enum {
	X509_cert_chain_server,
	X509_cert_chain_client,
} X509_CERT_CHAIN_TYPE;

#define X509_MAX_VERIFY_DEPTH	6
int x509_certs_verify(const uint8_t *certs, size_t certslen, int certs_type,
	const uint8_t *rootcerts, size_t rootcertslen, int depth, int *verify_result);
int x509_certs_verify_tlcp(const uint8_t *certs, size_t certslen, int certs_type,
	const uint8_t *rootcerts, size_t rootcertslen, int depth, int *verify_result);
int x509_certs_get_subjects(const uint8_t *certs, size_t certslen, uint8_t *names, size_t *nameslen);
int x509_certs_print(FILE *fp, int fmt, int ind, const char *label, const uint8_t *d, size_t dlen);


int x509_cert_new_from_file(uint8_t **out, size_t *outlen, const char *file);
int x509_certs_new_from_file(uint8_t **out, size_t *outlen, const char *file);


#ifdef __cplusplus
}
#endif
#endif