text: /*
   * X.509v3 certificate parsing and processing
   * Copyright (c) 2006-2011, Jouni Malinen <j@w1.fi>
   *
   * This software may be distributed under the terms of the BSD license.
   * See README for more details.
   */
  
  #ifndef X509V3_H
  #define X509V3_H
  
  #include "asn1.h"
  
  struct x509_algorithm_identifier {
  	struct asn1_oid oid;
  };
  
  struct x509_name_attr {
  	enum x509_name_attr_type {
  		X509_NAME_ATTR_NOT_USED,
  		X509_NAME_ATTR_DC,
  		X509_NAME_ATTR_CN,
  		X509_NAME_ATTR_C,
  		X509_NAME_ATTR_L,
  		X509_NAME_ATTR_ST,
  		X509_NAME_ATTR_O,
  		X509_NAME_ATTR_OU
  	} type;
  	char *value;
  };
  
  #define X509_MAX_NAME_ATTRIBUTES 20
  
  struct x509_name {
  	struct x509_name_attr attr[X509_MAX_NAME_ATTRIBUTES];
  	size_t num_attr;
  	char *email; /* emailAddress */
  
  	/* from alternative name extension */
  	char *alt_email; /* rfc822Name */
  	char *dns; /* dNSName */
  	char *uri; /* uniformResourceIdentifier */
  	u8 *ip; /* iPAddress */
  	size_t ip_len; /* IPv4: 4, IPv6: 16 */
  	struct asn1_oid rid; /* registeredID */
  };
  
  #define X509_MAX_SERIAL_NUM_LEN 20
  
  struct x509_certificate {
  	struct x509_certificate *next;
  	enum { X509_CERT_V1 = 0, X509_CERT_V2 = 1, X509_CERT_V3 = 2 } version;
  	u8 serial_number[X509_MAX_SERIAL_NUM_LEN];
  	size_t serial_number_len;
  	struct x509_algorithm_identifier signature;
  	struct x509_name issuer;
  	struct x509_name subject;
  	u8 *subject_dn;
  	size_t subject_dn_len;
  	os_time_t not_before;
  	os_time_t not_after;
  	struct x509_algorithm_identifier public_key_alg;
  	u8 *public_key;
  	size_t public_key_len;
  	struct x509_algorithm_identifier signature_alg;
  	u8 *sign_value;
  	size_t sign_value_len;
  
  	/* Extensions */
  	unsigned int extensions_present;
  #define X509_EXT_BASIC_CONSTRAINTS		(1 << 0)
  #define X509_EXT_PATH_LEN_CONSTRAINT		(1 << 1)
  #define X509_EXT_KEY_USAGE			(1 << 2)
  #define X509_EXT_SUBJECT_ALT_NAME		(1 << 3)
  #define X509_EXT_ISSUER_ALT_NAME		(1 << 4)
  #define X509_EXT_EXT_KEY_USAGE			(1 << 5)
  
  	/* BasicConstraints */
  	int ca; /* cA */
  	unsigned long path_len_constraint; /* pathLenConstraint */
  
  	/* KeyUsage */
  	unsigned long key_usage;
  #define X509_KEY_USAGE_DIGITAL_SIGNATURE	(1 << 0)
  #define X509_KEY_USAGE_NON_REPUDIATION		(1 << 1)
  #define X509_KEY_USAGE_KEY_ENCIPHERMENT		(1 << 2)
  #define X509_KEY_USAGE_DATA_ENCIPHERMENT	(1 << 3)
  #define X509_KEY_USAGE_KEY_AGREEMENT		(1 << 4)
  #define X509_KEY_USAGE_KEY_CERT_SIGN		(1 << 5)
  #define X509_KEY_USAGE_CRL_SIGN			(1 << 6)
  #define X509_KEY_USAGE_ENCIPHER_ONLY		(1 << 7)
  #define X509_KEY_USAGE_DECIPHER_ONLY		(1 << 8)
  
  	/* ExtKeyUsage */
  	unsigned long ext_key_usage;
  #define X509_EXT_KEY_USAGE_ANY			(1 << 0)
  #define X509_EXT_KEY_USAGE_SERVER_AUTH		(1 << 1)
  #define X509_EXT_KEY_USAGE_CLIENT_AUTH		(1 << 2)
  #define X509_EXT_KEY_USAGE_OCSP			(1 << 3)
  
  	/*
  	 * The DER format certificate follows struct x509_certificate. These
  	 * pointers point to that buffer.
  	 */
  	const u8 *cert_start;
  	size_t cert_len;
  	const u8 *tbs_cert_start;
  	size_t tbs_cert_len;
  
  	/* Meta data used for certificate validation */
  	unsigned int ocsp_good:1;
  	unsigned int ocsp_revoked:1;
  	unsigned int issuer_trusted:1;
  };
  
  enum {
  	X509_VALIDATE_OK,
  	X509_VALIDATE_BAD_CERTIFICATE,
  	X509_VALIDATE_UNSUPPORTED_CERTIFICATE,
  	X509_VALIDATE_CERTIFICATE_REVOKED,
  	X509_VALIDATE_CERTIFICATE_EXPIRED,
  	X509_VALIDATE_CERTIFICATE_UNKNOWN,
  	X509_VALIDATE_UNKNOWN_CA
  };
  
  void x509_certificate_free(struct x509_certificate *cert);
  int x509_parse_algorithm_identifier(const u8 *buf, size_t len,
  				    struct x509_algorithm_identifier *id,
  				    const u8 **next);
  int x509_parse_name(const u8 *buf, size_t len, struct x509_name *name,
  		    const u8 **next);
  int x509_parse_time(const u8 *buf, size_t len, u8 asn1_tag, os_time_t *val);
  struct x509_certificate * x509_certificate_parse(const u8 *buf, size_t len);
  void x509_free_name(struct x509_name *name);
  void x509_name_string(struct x509_name *name, char *buf, size_t len);
  int x509_name_compare(struct x509_name *a, struct x509_name *b);
  void x509_certificate_chain_free(struct x509_certificate *cert);
  int x509_check_signature(struct x509_certificate *issuer,
  			 struct x509_algorithm_identifier *signature,
  			 const u8 *sign_value, size_t sign_value_len,
  			 const u8 *signed_data, size_t signed_data_len);
  int x509_certificate_check_signature(struct x509_certificate *issuer,
  				     struct x509_certificate *cert);
  int x509_certificate_chain_validate(struct x509_certificate *trusted,
  				    struct x509_certificate *chain,
  				    int *reason, int disable_time_checks);
  struct x509_certificate *
  x509_certificate_get_subject(struct x509_certificate *chain,
  			     struct x509_name *name);
  int x509_certificate_self_signed(struct x509_certificate *cert);
  
  int x509_sha1_oid(struct asn1_oid *oid);
  int x509_sha256_oid(struct asn1_oid *oid);
  int x509_sha384_oid(struct asn1_oid *oid);
  int x509_sha512_oid(struct asn1_oid *oid);
  
  #endif /* X509V3_H */
  