/*
 * Copyright (C) 2003-2012 Free Software Foundation, Inc.
 *
 * Author: Nikos Mavrogiannopoulos
 *
 * This file is part of GnuTLS.
 *
 * The GnuTLS is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 3 of
 * the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 *
 */

/* This file contains the types and prototypes for the X.509
 * certificate and CRL handling functions.
 */

#ifndef GNUTLS_X509_H
#define GNUTLS_X509_H

#include <gnutls/gnutls.h>

#ifdef __cplusplus
extern "C"
{
#endif

/* Some OIDs usually found in Distinguished names, or
 * in Subject Directory Attribute extensions.
 */
#define GNUTLS_OID_X520_COUNTRY_NAME		"2.5.4.6"
#define GNUTLS_OID_X520_ORGANIZATION_NAME	"2.5.4.10"
#define GNUTLS_OID_X520_ORGANIZATIONAL_UNIT_NAME "2.5.4.11"
#define GNUTLS_OID_X520_COMMON_NAME		"2.5.4.3"
#define GNUTLS_OID_X520_LOCALITY_NAME		"2.5.4.7"
#define GNUTLS_OID_X520_STATE_OR_PROVINCE_NAME	"2.5.4.8"

#define GNUTLS_OID_X520_INITIALS		"2.5.4.43"
#define GNUTLS_OID_X520_GENERATION_QUALIFIER	"2.5.4.44"
#define GNUTLS_OID_X520_SURNAME			"2.5.4.4"
#define GNUTLS_OID_X520_GIVEN_NAME		"2.5.4.42"
#define GNUTLS_OID_X520_TITLE			"2.5.4.12"
#define GNUTLS_OID_X520_DN_QUALIFIER		"2.5.4.46"
#define GNUTLS_OID_X520_PSEUDONYM		"2.5.4.65"
#define GNUTLS_OID_X520_POSTALCODE              "2.5.4.17"
#define GNUTLS_OID_X520_NAME                    "2.5.4.41"

#define GNUTLS_OID_LDAP_DC			"0.9.2342.19200300.100.1.25"
#define GNUTLS_OID_LDAP_UID			"0.9.2342.19200300.100.1.1"

/* The following should not be included in DN.
 */
#define GNUTLS_OID_PKCS9_EMAIL			"1.2.840.113549.1.9.1"

#define GNUTLS_OID_PKIX_DATE_OF_BIRTH		"1.3.6.1.5.5.7.9.1"
#define GNUTLS_OID_PKIX_PLACE_OF_BIRTH		"1.3.6.1.5.5.7.9.2"
#define GNUTLS_OID_PKIX_GENDER			"1.3.6.1.5.5.7.9.3"
#define GNUTLS_OID_PKIX_COUNTRY_OF_CITIZENSHIP	"1.3.6.1.5.5.7.9.4"
#define GNUTLS_OID_PKIX_COUNTRY_OF_RESIDENCE	"1.3.6.1.5.5.7.9.5"

/* Key purpose Object Identifiers.
 */
#define GNUTLS_KP_TLS_WWW_SERVER		"1.3.6.1.5.5.7.3.1"
#define GNUTLS_KP_TLS_WWW_CLIENT                "1.3.6.1.5.5.7.3.2"
#define GNUTLS_KP_CODE_SIGNING			"1.3.6.1.5.5.7.3.3"
#define GNUTLS_KP_MS_SMART_CARD_LOGON		"1.3.6.1.4.1.311.20.2.2"
#define GNUTLS_KP_EMAIL_PROTECTION		"1.3.6.1.5.5.7.3.4"
#define GNUTLS_KP_TIME_STAMPING			"1.3.6.1.5.5.7.3.8"
#define GNUTLS_KP_OCSP_SIGNING			"1.3.6.1.5.5.7.3.9"
#define GNUTLS_KP_IPSEC_IKE			"1.3.6.1.5.5.7.3.17"
#define GNUTLS_KP_ANY				"2.5.29.37.0"

#define GNUTLS_OID_AIA				"1.3.6.1.5.5.7.1.1"
#define GNUTLS_OID_AD_OCSP			"1.3.6.1.5.5.7.48.1"
#define GNUTLS_OID_AD_CAISSUERS			"1.3.6.1.5.5.7.48.2"

#define GNUTLS_FSAN_SET 0
#define GNUTLS_FSAN_APPEND 1

/* Certificate handling functions.
 */

/**
 * gnutls_certificate_import_flags:
 * @GNUTLS_X509_CRT_LIST_IMPORT_FAIL_IF_EXCEED: Fail if the
 *   certificates in the buffer are more than the space allocated for
 *   certificates. The error code will be %GNUTLS_E_SHORT_MEMORY_BUFFER.
 * @GNUTLS_X509_CRT_LIST_FAIL_IF_UNSORTED: Fail if the certificates
 *   in the buffer are not ordered starting from subject to issuer.
 *   The error code will be %GNUTLS_E_CERTIFICATE_LIST_UNSORTED.
 *
 * Enumeration of different certificate import flags.
 */
  typedef enum gnutls_certificate_import_flags
  {
    GNUTLS_X509_CRT_LIST_IMPORT_FAIL_IF_EXCEED = 1,
    GNUTLS_X509_CRT_LIST_FAIL_IF_UNSORTED = 2
  } gnutls_certificate_import_flags;

  int gnutls_x509_crt_init (gnutls_x509_crt_t * cert);
  void gnutls_x509_crt_deinit (gnutls_x509_crt_t cert);
  int gnutls_x509_crt_import (gnutls_x509_crt_t cert,
                              const gnutls_datum_t * data,
                              gnutls_x509_crt_fmt_t format);
  int gnutls_x509_crt_list_import2 (gnutls_x509_crt_t ** certs,
                             unsigned int * size,
                             const gnutls_datum_t * data,
                             gnutls_x509_crt_fmt_t format, unsigned int flags);
  int gnutls_x509_crt_list_import (gnutls_x509_crt_t * certs,
                                   unsigned int *cert_max,
                                   const gnutls_datum_t * data,
                                   gnutls_x509_crt_fmt_t format,
                                   unsigned int flags);
  int gnutls_x509_crt_export (gnutls_x509_crt_t cert,
                              gnutls_x509_crt_fmt_t format,
                              void *output_data, size_t * output_data_size);
  int gnutls_x509_crt_export2 (gnutls_x509_crt_t cert,
                               gnutls_x509_crt_fmt_t format,
                               gnutls_datum_t* out);
  int gnutls_x509_crt_get_private_key_usage_period (gnutls_x509_crt_t cert, time_t* activation, time_t* expiration, 
                                     unsigned int *critical);

  int gnutls_x509_crt_get_issuer_dn (gnutls_x509_crt_t cert, char *buf,
                                     size_t * buf_size);
  int gnutls_x509_crt_get_issuer_dn_oid (gnutls_x509_crt_t cert, int indx,
                                         void *oid, size_t * oid_size);
  int gnutls_x509_crt_get_issuer_dn_by_oid (gnutls_x509_crt_t cert,
                                            const char *oid, int indx,
                                            unsigned int raw_flag,
                                            void *buf, size_t * buf_size);
  int gnutls_x509_crt_get_dn (gnutls_x509_crt_t cert, char *buf,
                              size_t * buf_size);
  int gnutls_x509_crt_get_dn_oid (gnutls_x509_crt_t cert, int indx,
                                  void *oid, size_t * oid_size);
  int gnutls_x509_crt_get_dn_by_oid (gnutls_x509_crt_t cert,
                                     const char *oid, int indx,
                                     unsigned int raw_flag, void *buf,
                                     size_t * buf_size);
  int gnutls_x509_crt_check_hostname (gnutls_x509_crt_t cert,
                                      const char *hostname);

  int gnutls_x509_crt_get_signature_algorithm (gnutls_x509_crt_t cert);
  int gnutls_x509_crt_get_signature (gnutls_x509_crt_t cert,
                                     char *sig, size_t * sizeof_sig);
  int gnutls_x509_crt_get_version (gnutls_x509_crt_t cert);
  int gnutls_x509_crt_get_key_id (gnutls_x509_crt_t crt,
                                  unsigned int flags,
                                  unsigned char *output_data,
                                  size_t * output_data_size);

  int gnutls_x509_crt_set_private_key_usage_period (gnutls_x509_crt_t crt,
                                                    time_t activation,
                                                    time_t expiration);
  int gnutls_x509_crt_set_authority_key_id (gnutls_x509_crt_t cert,
                                            const void *id, size_t id_size);
  int gnutls_x509_crt_get_authority_key_id (gnutls_x509_crt_t cert,
                                            void *id, size_t * id_size,
                                            unsigned int *critical);
  int gnutls_x509_crt_get_authority_key_gn_serial (gnutls_x509_crt_t cert,
						   unsigned int seq,
						   void *alt,
						   size_t * alt_size,
						   unsigned int *alt_type,
						   void* serial,
						   size_t *serial_size,
						   unsigned int *critical);

  int gnutls_x509_crt_get_subject_key_id (gnutls_x509_crt_t cert,
                                          void *ret, size_t * ret_size,
                                          unsigned int *critical);

  int gnutls_x509_crt_get_subject_unique_id (gnutls_x509_crt_t crt, char *buf,
                                             size_t * buf_size);

  int gnutls_x509_crt_get_issuer_unique_id (gnutls_x509_crt_t crt, char *buf,
                                            size_t * buf_size);

  void gnutls_x509_crt_set_pin_function (gnutls_x509_crt_t crt,
                                       gnutls_pin_callback_t fn, void *userdata);

  /**
   * gnutls_info_access_what_t:
   * @GNUTLS_IA_ACCESSMETHOD_OID: Get accessMethod OID.
   * @GNUTLS_IA_ACCESSLOCATION_GENERALNAME_TYPE: Get accessLocation name type.
   * @GNUTLS_IA_URI: Get accessLocation URI value.
   * @GNUTLS_IA_OCSP_URI: get accessLocation URI value for OCSP.
   * @GNUTLS_IA_CAISSUERS_URI: get accessLocation URI value for caIssuers.
   *
   * Enumeration of types for the @what parameter of
   * gnutls_x509_crt_get_authority_info_access().
   */
  typedef enum gnutls_info_access_what_t
    {
      GNUTLS_IA_ACCESSMETHOD_OID = 1,
      GNUTLS_IA_ACCESSLOCATION_GENERALNAME_TYPE = 2,
      /* use 100-108 for the generalName types, populate as needed */
      GNUTLS_IA_URI = 106,
      /* quick-access variants that match both OID and name type. */
      GNUTLS_IA_OCSP_URI = 10006,
      GNUTLS_IA_CAISSUERS_URI = 10106
    } gnutls_info_access_what_t;

  int gnutls_x509_crt_get_authority_info_access (gnutls_x509_crt_t crt,
						 unsigned int seq,
						 int what,
						 gnutls_datum_t * data,
						 unsigned int *critical);

#define GNUTLS_CRL_REASON_SUPERSEEDED GNUTLS_CRL_REASON_SUPERSEDED,
  /**
   * gnutls_x509_crl_reason_flags_t:
   * @GNUTLS_CRL_REASON_PRIVILEGE_WITHDRAWN: The privileges were withdrawn from the owner.
   * @GNUTLS_CRL_REASON_CERTIFICATE_HOLD: The certificate is on hold.
   * @GNUTLS_CRL_REASON_CESSATION_OF_OPERATION: The end-entity is no longer operating.
   * @GNUTLS_CRL_REASON_SUPERSEDED: There is a newer certificate of the owner.
   * @GNUTLS_CRL_REASON_AFFILIATION_CHANGED: The end-entity affiliation has changed.
   * @GNUTLS_CRL_REASON_CA_COMPROMISE: The CA was compromised.
   * @GNUTLS_CRL_REASON_KEY_COMPROMISE: The certificate's key was compromised.
   * @GNUTLS_CRL_REASON_UNUSED: The key was never used.
   * @GNUTLS_CRL_REASON_AA_COMPROMISE: AA compromised.
   *
   * Enumeration of types for the CRL revocation reasons. 
   */
  typedef enum gnutls_x509_crl_reason_flags_t
    {
      GNUTLS_CRL_REASON_UNSPECIFIED=0,
      GNUTLS_CRL_REASON_PRIVILEGE_WITHDRAWN=1,
      GNUTLS_CRL_REASON_CERTIFICATE_HOLD=2,
      GNUTLS_CRL_REASON_CESSATION_OF_OPERATION=4,
      GNUTLS_CRL_REASON_SUPERSEDED=8,
      GNUTLS_CRL_REASON_AFFILIATION_CHANGED=16,
      GNUTLS_CRL_REASON_CA_COMPROMISE=32,
      GNUTLS_CRL_REASON_KEY_COMPROMISE=64,
      GNUTLS_CRL_REASON_UNUSED=128,
      GNUTLS_CRL_REASON_AA_COMPROMISE=32768
    } gnutls_x509_crl_reason_flags_t;

  int gnutls_x509_crt_get_crl_dist_points (gnutls_x509_crt_t cert,
                                           unsigned int seq, void *ret,
                                           size_t * ret_size,
                                           unsigned int *reason_flags,
                                           unsigned int *critical);
  int gnutls_x509_crt_set_crl_dist_points2 (gnutls_x509_crt_t crt,
                                            gnutls_x509_subject_alt_name_t
                                            type, const void *data,
                                            unsigned int data_size,
                                            unsigned int reason_flags);
  int gnutls_x509_crt_set_crl_dist_points (gnutls_x509_crt_t crt,
                                           gnutls_x509_subject_alt_name_t
                                           type, const void *data_string,
                                           unsigned int reason_flags);
  int gnutls_x509_crt_cpy_crl_dist_points (gnutls_x509_crt_t dst,
                                           gnutls_x509_crt_t src);

  int gnutls_x509_crl_sign2 (gnutls_x509_crl_t crl,
                             gnutls_x509_crt_t issuer,
                             gnutls_x509_privkey_t issuer_key,
                             gnutls_digest_algorithm_t dig,
                             unsigned int flags);

  time_t gnutls_x509_crt_get_activation_time (gnutls_x509_crt_t cert);
  time_t gnutls_x509_crt_get_expiration_time (gnutls_x509_crt_t cert);
  int gnutls_x509_crt_get_serial (gnutls_x509_crt_t cert, void *result,
                                  size_t * result_size);

  int gnutls_x509_crt_get_pk_algorithm (gnutls_x509_crt_t cert,
                                        unsigned int *bits);
  int gnutls_x509_crt_get_pk_rsa_raw (gnutls_x509_crt_t crt,
                                      gnutls_datum_t * m, gnutls_datum_t * e);
  int gnutls_x509_crt_get_pk_dsa_raw (gnutls_x509_crt_t crt,
                                      gnutls_datum_t * p,
                                      gnutls_datum_t * q,
                                      gnutls_datum_t * g, gnutls_datum_t * y);

  int gnutls_x509_crt_get_subject_alt_name (gnutls_x509_crt_t cert,
                                            unsigned int seq, void *san,
                                            size_t * san_size,
                                            unsigned int *critical);
  int gnutls_x509_crt_get_subject_alt_name2 (gnutls_x509_crt_t cert,
                                             unsigned int seq, void *san,
                                             size_t * san_size,
                                             unsigned int *san_type,
                                             unsigned int *critical);

  int gnutls_x509_crt_get_subject_alt_othername_oid (gnutls_x509_crt_t cert,
                                                     unsigned int seq,
                                                     void *oid,
                                                     size_t * oid_size);

  int gnutls_x509_crt_get_issuer_alt_name (gnutls_x509_crt_t cert,
                                           unsigned int seq, void *ian,
                                           size_t * ian_size,
                                           unsigned int *critical);
  int gnutls_x509_crt_get_issuer_alt_name2 (gnutls_x509_crt_t cert,
                                            unsigned int seq, void *ian,
                                            size_t * ian_size,
                                            unsigned int *ian_type,
                                            unsigned int *critical);

  int gnutls_x509_crt_get_issuer_alt_othername_oid (gnutls_x509_crt_t cert,
                                                    unsigned int seq,
                                                    void *ret,
                                                    size_t * ret_size);

  int gnutls_x509_crt_get_ca_status (gnutls_x509_crt_t cert,
                                     unsigned int *critical);
  int gnutls_x509_crt_get_basic_constraints (gnutls_x509_crt_t cert,
                                             unsigned int *critical,
                                             unsigned int *ca, int *pathlen);

/* The key_usage flags are defined in gnutls.h. They are the
 * GNUTLS_KEY_* definitions.
 */
  int gnutls_x509_crt_get_key_usage (gnutls_x509_crt_t cert,
                                     unsigned int *key_usage,
                                     unsigned int *critical);
  int gnutls_x509_crt_set_key_usage (gnutls_x509_crt_t crt,
                                     unsigned int usage);
  int gnutls_x509_crt_set_authority_info_access (gnutls_x509_crt_t crt,
  					         int what,
					         gnutls_datum_t * data);

  int gnutls_x509_crt_get_proxy (gnutls_x509_crt_t cert,
                                 unsigned int *critical,
                                 int *pathlen,
                                 char **policyLanguage,
                                 char **policy, size_t * sizeof_policy);

  int gnutls_x509_dn_oid_known (const char *oid);

#define GNUTLS_X509_DN_OID_RETURN_OID 1
  const char* gnutls_x509_dn_oid_name (const char *oid, unsigned int flags);

  /* Read extensions by OID. */
  int gnutls_x509_crt_get_extension_oid (gnutls_x509_crt_t cert, int indx,
                                         void *oid, size_t * oid_size);
  int gnutls_x509_crt_get_extension_by_oid (gnutls_x509_crt_t cert,
                                            const char *oid, int indx,
                                            void *buf, size_t * buf_size,
                                            unsigned int *critical);

  /* Read extensions by sequence number. */
  int gnutls_x509_crt_get_extension_info (gnutls_x509_crt_t cert, int indx,
                                          void *oid, size_t * oid_size,
                                          unsigned int *critical);
  int gnutls_x509_crt_get_extension_data (gnutls_x509_crt_t cert, int indx,
                                          void *data, size_t * sizeof_data);

  int gnutls_x509_crt_set_extension_by_oid (gnutls_x509_crt_t crt,
                                            const char *oid,
                                            const void *buf,
                                            size_t sizeof_buf,
                                            unsigned int critical);

/* X.509 Certificate writing.
 */
  int gnutls_x509_crt_set_dn_by_oid (gnutls_x509_crt_t crt,
                                     const char *oid,
                                     unsigned int raw_flag,
                                     const void *name,
                                     unsigned int sizeof_name);
  int gnutls_x509_crt_set_issuer_dn_by_oid (gnutls_x509_crt_t crt,
                                            const char *oid,
                                            unsigned int raw_flag,
                                            const void *name,
                                            unsigned int sizeof_name);
  int gnutls_x509_crt_set_version (gnutls_x509_crt_t crt,
                                   unsigned int version);
  int gnutls_x509_crt_set_key (gnutls_x509_crt_t crt,
                               gnutls_x509_privkey_t key);
  int gnutls_x509_crt_set_ca_status (gnutls_x509_crt_t crt, unsigned int ca);
  int gnutls_x509_crt_set_basic_constraints (gnutls_x509_crt_t crt,
                                             unsigned int ca,
                                             int pathLenConstraint);
  int gnutls_x509_crt_set_subject_alternative_name (gnutls_x509_crt_t crt,
                                                    gnutls_x509_subject_alt_name_t
                                                    type,
                                                    const char *data_string);
  int gnutls_x509_crt_set_subject_alt_name (gnutls_x509_crt_t crt,
                                            gnutls_x509_subject_alt_name_t
                                            type, const void *data,
                                            unsigned int data_size,
                                            unsigned int flags);
  int gnutls_x509_crt_sign (gnutls_x509_crt_t crt, gnutls_x509_crt_t issuer,
                            gnutls_x509_privkey_t issuer_key);
  int gnutls_x509_crt_sign2 (gnutls_x509_crt_t crt, gnutls_x509_crt_t issuer,
                             gnutls_x509_privkey_t issuer_key,
                             gnutls_digest_algorithm_t dig,
                             unsigned int flags);
  int gnutls_x509_crt_set_activation_time (gnutls_x509_crt_t cert,
                                           time_t act_time);
  int gnutls_x509_crt_set_expiration_time (gnutls_x509_crt_t cert,
                                           time_t exp_time);
  int gnutls_x509_crt_set_serial (gnutls_x509_crt_t cert, const void *serial,
                                  size_t serial_size);

  int gnutls_x509_crt_set_subject_key_id (gnutls_x509_crt_t cert,
                                          const void *id, size_t id_size);

  int gnutls_x509_crt_set_proxy_dn (gnutls_x509_crt_t crt,
                                    gnutls_x509_crt_t eecrt,
                                    unsigned int raw_flag,
                                    const void *name,
                                    unsigned int sizeof_name);
  int gnutls_x509_crt_set_proxy (gnutls_x509_crt_t crt,
                                 int pathLenConstraint,
                                 const char *policyLanguage,
                                 const char *policy, size_t sizeof_policy);

  int gnutls_x509_crt_print (gnutls_x509_crt_t cert,
                             gnutls_certificate_print_formats_t format,
                             gnutls_datum_t * out);
  int gnutls_x509_crl_print (gnutls_x509_crl_t crl,
                             gnutls_certificate_print_formats_t format,
                             gnutls_datum_t * out);

  /* Access to internal Certificate fields.
   */
  int gnutls_x509_crt_get_raw_issuer_dn (gnutls_x509_crt_t cert,
                                         gnutls_datum_t * start);
  int gnutls_x509_crt_get_raw_dn (gnutls_x509_crt_t cert,
                                  gnutls_datum_t * start);

/* RDN handling.
 */
  int gnutls_x509_rdn_get (const gnutls_datum_t * idn,
                           char *buf, size_t * sizeof_buf);
  int gnutls_x509_rdn_get_oid (const gnutls_datum_t * idn,
                               int indx, void *buf, size_t * sizeof_buf);

  int gnutls_x509_rdn_get_by_oid (const gnutls_datum_t * idn,
                                  const char *oid, int indx,
                                  unsigned int raw_flag, void *buf,
                                  size_t * sizeof_buf);

  typedef void *gnutls_x509_dn_t;

  typedef struct gnutls_x509_ava_st
  {
    gnutls_datum_t oid;
    gnutls_datum_t value;
    unsigned long value_tag;
  } gnutls_x509_ava_st;

  int gnutls_x509_crt_get_subject (gnutls_x509_crt_t cert,
                                   gnutls_x509_dn_t * dn);
  int gnutls_x509_crt_get_issuer (gnutls_x509_crt_t cert,
                                  gnutls_x509_dn_t * dn);
  int gnutls_x509_dn_get_rdn_ava (gnutls_x509_dn_t dn, int irdn,
                                  int iava, gnutls_x509_ava_st * ava);

  int gnutls_x509_dn_init (gnutls_x509_dn_t * dn);

  int gnutls_x509_dn_import (gnutls_x509_dn_t dn,
                             const gnutls_datum_t * data);

  int gnutls_x509_dn_export (gnutls_x509_dn_t dn,
                             gnutls_x509_crt_fmt_t format, void *output_data,
                             size_t * output_data_size);
  int gnutls_x509_dn_export2 (gnutls_x509_dn_t dn,
                             gnutls_x509_crt_fmt_t format,
                             gnutls_datum_t * out);

  void gnutls_x509_dn_deinit (gnutls_x509_dn_t dn);


/* CRL handling functions.
 */
  int gnutls_x509_crl_init (gnutls_x509_crl_t * crl);
  void gnutls_x509_crl_deinit (gnutls_x509_crl_t crl);

  int gnutls_x509_crl_import (gnutls_x509_crl_t crl,
                              const gnutls_datum_t * data,
                              gnutls_x509_crt_fmt_t format);
  int gnutls_x509_crl_export (gnutls_x509_crl_t crl,
                              gnutls_x509_crt_fmt_t format,
                              void *output_data, size_t * output_data_size);
  int gnutls_x509_crl_export2 (gnutls_x509_crl_t crl,
                               gnutls_x509_crt_fmt_t format,
                               gnutls_datum_t *out);

  int
  gnutls_x509_crl_get_raw_issuer_dn (gnutls_x509_crl_t crl,
                                      gnutls_datum_t * dn);

  int gnutls_x509_crl_get_issuer_dn (const gnutls_x509_crl_t crl,
                                     char *buf, size_t * sizeof_buf);
  int gnutls_x509_crl_get_issuer_dn_by_oid (gnutls_x509_crl_t crl,
                                            const char *oid, int indx,
                                            unsigned int raw_flag,
                                            void *buf, size_t * sizeof_buf);
  int gnutls_x509_crl_get_dn_oid (gnutls_x509_crl_t crl, int indx,
                                  void *oid, size_t * sizeof_oid);

  int gnutls_x509_crl_get_signature_algorithm (gnutls_x509_crl_t crl);
  int gnutls_x509_crl_get_signature (gnutls_x509_crl_t crl,
                                     char *sig, size_t * sizeof_sig);
  int gnutls_x509_crl_get_version (gnutls_x509_crl_t crl);

  time_t gnutls_x509_crl_get_this_update (gnutls_x509_crl_t crl);
  time_t gnutls_x509_crl_get_next_update (gnutls_x509_crl_t crl);

  int gnutls_x509_crl_get_crt_count (gnutls_x509_crl_t crl);
  int gnutls_x509_crl_get_crt_serial (gnutls_x509_crl_t crl, int indx,
                                      unsigned char *serial,
                                      size_t * serial_size, time_t * t);
#define gnutls_x509_crl_get_certificate_count gnutls_x509_crl_get_crt_count
#define gnutls_x509_crl_get_certificate gnutls_x509_crl_get_crt_serial

  int gnutls_x509_crl_check_issuer (gnutls_x509_crl_t crl,
                                    gnutls_x509_crt_t issuer);

  int gnutls_x509_crl_list_import2 (gnutls_x509_crl_t ** crls,
                             unsigned int * size,
                             const gnutls_datum_t * data,
                             gnutls_x509_crt_fmt_t format, unsigned int flags);

  int gnutls_x509_crl_list_import (gnutls_x509_crl_t * crls,
                                   unsigned int *crl_max,
                                   const gnutls_datum_t * data,
                                   gnutls_x509_crt_fmt_t format,
                                   unsigned int flags);
/* CRL writing.
 */
  int gnutls_x509_crl_set_version (gnutls_x509_crl_t crl,
                                   unsigned int version);
  int gnutls_x509_crl_set_this_update (gnutls_x509_crl_t crl,
                                       time_t act_time);
  int gnutls_x509_crl_set_next_update (gnutls_x509_crl_t crl,
                                       time_t exp_time);
  int gnutls_x509_crl_set_crt_serial (gnutls_x509_crl_t crl,
                                      const void *serial,
                                      size_t serial_size,
                                      time_t revocation_time);
  int gnutls_x509_crl_set_crt (gnutls_x509_crl_t crl,
                               gnutls_x509_crt_t crt, time_t revocation_time);

  int gnutls_x509_crl_get_authority_key_id (gnutls_x509_crl_t crl, void *id,
                                            size_t * id_size,
                                            unsigned int *critical);
  int gnutls_x509_crl_get_authority_key_gn_serial (gnutls_x509_crl_t crl,
						   unsigned int seq,
						   void *alt,
						   size_t * alt_size,
						   unsigned int *alt_type,
						   void* serial,
						   size_t *serial_size,
						   unsigned int *critical);

  int gnutls_x509_crl_get_number (gnutls_x509_crl_t crl, void *ret,
                                  size_t * ret_size, unsigned int *critical);

  int gnutls_x509_crl_get_extension_oid (gnutls_x509_crl_t crl, int indx,
                                         void *oid, size_t * sizeof_oid);

  int gnutls_x509_crl_get_extension_info (gnutls_x509_crl_t crl, int indx,
                                          void *oid, size_t * sizeof_oid,
                                          unsigned int *critical);

  int gnutls_x509_crl_get_extension_data (gnutls_x509_crl_t crl, int indx,
                                          void *data, size_t * sizeof_data);

  int gnutls_x509_crl_set_authority_key_id (gnutls_x509_crl_t crl,
                                            const void *id, size_t id_size);

  int gnutls_x509_crl_set_number (gnutls_x509_crl_t crl,
                                  const void *nr, size_t nr_size);


/* PKCS7 structures handling
 */
  struct gnutls_pkcs7_int;
  typedef struct gnutls_pkcs7_int *gnutls_pkcs7_t;

  int gnutls_pkcs7_init (gnutls_pkcs7_t * pkcs7);
  void gnutls_pkcs7_deinit (gnutls_pkcs7_t pkcs7);
  int gnutls_pkcs7_import (gnutls_pkcs7_t pkcs7,
                           const gnutls_datum_t * data,
                           gnutls_x509_crt_fmt_t format);
  int gnutls_pkcs7_export (gnutls_pkcs7_t pkcs7,
                           gnutls_x509_crt_fmt_t format,
                           void *output_data, size_t * output_data_size);
  int gnutls_pkcs7_export2 (gnutls_pkcs7_t pkcs7,
                            gnutls_x509_crt_fmt_t format,
                            gnutls_datum_t *out);

  int gnutls_pkcs7_get_crt_count (gnutls_pkcs7_t pkcs7);
  int gnutls_pkcs7_get_crt_raw (gnutls_pkcs7_t pkcs7, int indx,
                                void *certificate, size_t * certificate_size);

  int gnutls_pkcs7_set_crt_raw (gnutls_pkcs7_t pkcs7,
                                const gnutls_datum_t * crt);
  int gnutls_pkcs7_set_crt (gnutls_pkcs7_t pkcs7, gnutls_x509_crt_t crt);
  int gnutls_pkcs7_delete_crt (gnutls_pkcs7_t pkcs7, int indx);

  int gnutls_pkcs7_get_crl_raw (gnutls_pkcs7_t pkcs7,
                                int indx, void *crl, size_t * crl_size);
  int gnutls_pkcs7_get_crl_count (gnutls_pkcs7_t pkcs7);

  int gnutls_pkcs7_set_crl_raw (gnutls_pkcs7_t pkcs7,
                                const gnutls_datum_t * crl);
  int gnutls_pkcs7_set_crl (gnutls_pkcs7_t pkcs7, gnutls_x509_crl_t crl);
  int gnutls_pkcs7_delete_crl (gnutls_pkcs7_t pkcs7, int indx);

/* X.509 Certificate verification functions.
 */

/**
 * gnutls_certificate_verify_flags:
 * @GNUTLS_VERIFY_DISABLE_CA_SIGN: If set a signer does not have to be
 *   a certificate authority. This flag should normaly be disabled,
 *   unless you know what this means.
 * @GNUTLS_VERIFY_DISABLE_TRUSTED_TIME_CHECKS: If set a signer in the trusted
 *   list is never checked for expiration or activation.
 * @GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT: Allow trusted CA certiﬁcates
 *   with version 1. This is safer than %GNUTLS_VERIFY_ALLOW_ANY_X509_V1_CA_CRT,
 *   and should be used instead. That way only signers in your trusted list
 *   will be allowed to have certiﬁcates of version 1. This is the default.
 * @GNUTLS_VERIFY_DO_NOT_ALLOW_X509_V1_CA_CRT: Do not allow trusted CA
 *   certificates that have version 1.  This option is to be used
 *   to deprecate all certificates of version 1.
 * @GNUTLS_VERIFY_DO_NOT_ALLOW_SAME: If a certificate is not signed by
 *   anyone trusted but exists in the trusted CA list do not treat it
 *   as trusted.
 * @GNUTLS_VERIFY_ALLOW_UNSORTED_CHAIN: A certificate chain is tolerated
 *   if unsorted (the case with many TLS servers out there). This is the
 *   default since GnuTLS 3.1.4.
 * @GNUTLS_VERIFY_DO_NOT_ALLOW_UNSORTED_CHAIN: Do not tolerate an unsorted
 *   certificate chain.
 * @GNUTLS_VERIFY_ALLOW_ANY_X509_V1_CA_CRT: Allow CA certificates that
 *   have version 1 (both root and intermediate). This might be
 *   dangerous since those haven't the basicConstraints
 *   extension. Must be used in combination with
 *   %GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT.
 * @GNUTLS_VERIFY_ALLOW_SIGN_RSA_MD2: Allow certificates to be signed
 *   using the broken MD2 algorithm.
 * @GNUTLS_VERIFY_ALLOW_SIGN_RSA_MD5: Allow certificates to be signed
 *   using the broken MD5 algorithm.
 * @GNUTLS_VERIFY_DISABLE_TIME_CHECKS: Disable checking of activation
 *   and expiration validity periods of certificate chains. Don't set
 *   this unless you understand the security implications.
 * @GNUTLS_VERIFY_DISABLE_CRL_CHECKS: Disable checking for validity
 *   using certificate revocation lists or the available OCSP data.
 *
 * Enumeration of different certificate verify flags.
 */
  typedef enum gnutls_certificate_verify_flags
  {
    GNUTLS_VERIFY_DISABLE_CA_SIGN = 1<<0,
    GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT = 1<<1,
    GNUTLS_VERIFY_DO_NOT_ALLOW_SAME = 1<<2,
    GNUTLS_VERIFY_ALLOW_ANY_X509_V1_CA_CRT = 1<<3,
    GNUTLS_VERIFY_ALLOW_SIGN_RSA_MD2 = 1<<4,
    GNUTLS_VERIFY_ALLOW_SIGN_RSA_MD5 = 1<<5,
    GNUTLS_VERIFY_DISABLE_TIME_CHECKS = 1<<6,
    GNUTLS_VERIFY_DISABLE_TRUSTED_TIME_CHECKS = 1<<7,
    GNUTLS_VERIFY_DO_NOT_ALLOW_X509_V1_CA_CRT = 1<<8,
    GNUTLS_VERIFY_DISABLE_CRL_CHECKS = 1<<9,
    GNUTLS_VERIFY_ALLOW_UNSORTED_CHAIN = 1<<10,
    GNUTLS_VERIFY_DO_NOT_ALLOW_UNSORTED_CHAIN = 1<<11,
  } gnutls_certificate_verify_flags;

  int gnutls_x509_crt_check_issuer (gnutls_x509_crt_t cert,
                                    gnutls_x509_crt_t issuer);

  int gnutls_x509_crt_list_verify (const gnutls_x509_crt_t * cert_list,
                                   int cert_list_length,
                                   const gnutls_x509_crt_t * CA_list,
                                   int CA_list_length,
                                   const gnutls_x509_crl_t * CRL_list,
                                   int CRL_list_length,
                                   unsigned int flags, unsigned int *verify);

  int gnutls_x509_crt_verify (gnutls_x509_crt_t cert,
                              const gnutls_x509_crt_t * CA_list,
                              int CA_list_length, unsigned int flags,
                              unsigned int *verify);
  int gnutls_x509_crl_verify (gnutls_x509_crl_t crl,
                              const gnutls_x509_crt_t * CA_list,
                              int CA_list_length, unsigned int flags,
                              unsigned int *verify);

  int gnutls_x509_crt_check_revocation (gnutls_x509_crt_t cert,
                                        const gnutls_x509_crl_t *
                                        crl_list, int crl_list_length);

  int gnutls_x509_crt_get_fingerprint (gnutls_x509_crt_t cert,
                                       gnutls_digest_algorithm_t algo,
                                       void *buf, size_t * buf_size);

  int gnutls_x509_crt_get_key_purpose_oid (gnutls_x509_crt_t cert,
                                           int indx, void *oid,
                                           size_t * oid_size,
                                           unsigned int *critical);
  int gnutls_x509_crt_set_key_purpose_oid (gnutls_x509_crt_t cert,
                                           const void *oid,
                                           unsigned int critical);

/* Private key handling.
 */

/* Flags for the gnutls_x509_privkey_export_pkcs8() function.
 */

#define GNUTLS_PKCS8_PLAIN GNUTLS_PKCS_PLAIN
#define GNUTLS_PKCS8_USE_PKCS12_3DES GNUTLS_PKCS_USE_PKCS12_3DES
#define GNUTLS_PKCS8_USE_PKCS12_ARCFOUR GNUTLS_PKCS_USE_PKCS12_ARCFOUR
#define GNUTLS_PKCS8_USE_PKCS12_RC2_40 GNUTLS_PKCS_USE_PKCS12_RC2_40

/**
 * gnutls_pkcs_encrypt_flags_t:
 * @GNUTLS_PKCS_PLAIN: Unencrypted private key.
 * @GNUTLS_PKCS_NULL_PASSWORD: Some schemas distinguish between an empty and a NULL password.
 * @GNUTLS_PKCS_USE_PKCS12_3DES: PKCS-12 3DES.
 * @GNUTLS_PKCS_USE_PKCS12_ARCFOUR: PKCS-12 ARCFOUR.
 * @GNUTLS_PKCS_USE_PKCS12_RC2_40: PKCS-12 RC2-40.
 * @GNUTLS_PKCS_USE_PBES2_3DES: PBES2 3DES.
 * @GNUTLS_PKCS_USE_PBES2_AES_128: PBES2 AES-128.
 * @GNUTLS_PKCS_USE_PBES2_AES_192: PBES2 AES-192.
 * @GNUTLS_PKCS_USE_PBES2_AES_256: PBES2 AES-256.
 *
 * Enumeration of different PKCS encryption flags.
 */
  typedef enum gnutls_pkcs_encrypt_flags_t
  {
    GNUTLS_PKCS_PLAIN = 1,
    GNUTLS_PKCS_USE_PKCS12_3DES = 2,
    GNUTLS_PKCS_USE_PKCS12_ARCFOUR = 4,
    GNUTLS_PKCS_USE_PKCS12_RC2_40 = 8,
    GNUTLS_PKCS_USE_PBES2_3DES = 16,
    GNUTLS_PKCS_USE_PBES2_AES_128 = 32,
    GNUTLS_PKCS_USE_PBES2_AES_192 = 64,
    GNUTLS_PKCS_USE_PBES2_AES_256 = 128,
    GNUTLS_PKCS_NULL_PASSWORD = 256
  } gnutls_pkcs_encrypt_flags_t;

  int gnutls_x509_privkey_init (gnutls_x509_privkey_t * key);
  void gnutls_x509_privkey_deinit (gnutls_x509_privkey_t key);
  gnutls_sec_param_t gnutls_x509_privkey_sec_param (gnutls_x509_privkey_t
                                                    key);
  int gnutls_x509_privkey_cpy (gnutls_x509_privkey_t dst,
                               gnutls_x509_privkey_t src);
  int gnutls_x509_privkey_import (gnutls_x509_privkey_t key,
                                  const gnutls_datum_t * data,
                                  gnutls_x509_crt_fmt_t format);
  int gnutls_x509_privkey_import_pkcs8 (gnutls_x509_privkey_t key,
                                        const gnutls_datum_t * data,
                                        gnutls_x509_crt_fmt_t format,
                                        const char *password,
                                        unsigned int flags);
  int gnutls_x509_privkey_import_openssl (gnutls_x509_privkey_t key,
                                          const gnutls_datum_t *data, 
                                          const char* password);

  int gnutls_x509_privkey_import2 (gnutls_x509_privkey_t key,
                                   const gnutls_datum_t * data,
                                   gnutls_x509_crt_fmt_t format,
                                   const char* password, unsigned int flags);

  int gnutls_x509_privkey_import_rsa_raw (gnutls_x509_privkey_t key,
                                          const gnutls_datum_t * m,
                                          const gnutls_datum_t * e,
                                          const gnutls_datum_t * d,
                                          const gnutls_datum_t * p,
                                          const gnutls_datum_t * q,
                                          const gnutls_datum_t * u);
  int gnutls_x509_privkey_import_rsa_raw2 (gnutls_x509_privkey_t key,
                                           const gnutls_datum_t * m,
                                           const gnutls_datum_t * e,
                                           const gnutls_datum_t * d,
                                           const gnutls_datum_t * p,
                                           const gnutls_datum_t * q,
                                           const gnutls_datum_t * u,
                                           const gnutls_datum_t * e1,
                                           const gnutls_datum_t * e2);
  int gnutls_x509_privkey_import_ecc_raw (gnutls_x509_privkey_t key,
                                          gnutls_ecc_curve_t curve,
                                          const gnutls_datum_t * x,
                                          const gnutls_datum_t * y,
                                          const gnutls_datum_t * k);

  int gnutls_x509_privkey_fix (gnutls_x509_privkey_t key);

  int gnutls_x509_privkey_export_dsa_raw (gnutls_x509_privkey_t key,
                                          gnutls_datum_t * p,
                                          gnutls_datum_t * q,
                                          gnutls_datum_t * g,
                                          gnutls_datum_t * y,
                                          gnutls_datum_t * x);
  int gnutls_x509_privkey_import_dsa_raw (gnutls_x509_privkey_t key,
                                          const gnutls_datum_t * p,
                                          const gnutls_datum_t * q,
                                          const gnutls_datum_t * g,
                                          const gnutls_datum_t * y,
                                          const gnutls_datum_t * x);

  int gnutls_x509_privkey_get_pk_algorithm (gnutls_x509_privkey_t key);
  int gnutls_x509_privkey_get_pk_algorithm2 (gnutls_x509_privkey_t key, unsigned int *bits);
  int gnutls_x509_privkey_get_key_id (gnutls_x509_privkey_t key,
                                      unsigned int flags,
                                      unsigned char *output_data,
                                      size_t * output_data_size);

  int gnutls_x509_privkey_generate (gnutls_x509_privkey_t key,
                                    gnutls_pk_algorithm_t algo,
                                    unsigned int bits, unsigned int flags);
  int gnutls_x509_privkey_verify_params (gnutls_x509_privkey_t key);

  int gnutls_x509_privkey_export (gnutls_x509_privkey_t key,
                                  gnutls_x509_crt_fmt_t format,
                                  void *output_data,
                                  size_t * output_data_size);
  int gnutls_x509_privkey_export2 (gnutls_x509_privkey_t key,
                                   gnutls_x509_crt_fmt_t format,
                                   gnutls_datum_t * out);
  int gnutls_x509_privkey_export_pkcs8 (gnutls_x509_privkey_t key,
                                        gnutls_x509_crt_fmt_t format,
                                        const char *password,
                                        unsigned int flags,
                                        void *output_data,
                                        size_t * output_data_size);
  int gnutls_x509_privkey_export2_pkcs8 (gnutls_x509_privkey_t key,
                                         gnutls_x509_crt_fmt_t format,
                                         const char *password,
                                         unsigned int flags,
                                         gnutls_datum_t * out);
  int gnutls_x509_privkey_export_rsa_raw2 (gnutls_x509_privkey_t key,
                                           gnutls_datum_t * m,
                                           gnutls_datum_t * e,
                                           gnutls_datum_t * d,
                                           gnutls_datum_t * p,
                                           gnutls_datum_t * q,
                                           gnutls_datum_t * u,
                                           gnutls_datum_t * e1,
                                           gnutls_datum_t * e2);
  int gnutls_x509_privkey_export_rsa_raw (gnutls_x509_privkey_t key,
                                          gnutls_datum_t * m,
                                          gnutls_datum_t * e,
                                          gnutls_datum_t * d,
                                          gnutls_datum_t * p,
                                          gnutls_datum_t * q,
                                          gnutls_datum_t * u);
  int gnutls_x509_privkey_export_ecc_raw (gnutls_x509_privkey_t key, 
                                          gnutls_ecc_curve_t *curve,  
                                          gnutls_datum_t * x, gnutls_datum_t * y,
                                          gnutls_datum_t* k);
/* Certificate request stuff.
 */

  int gnutls_x509_crq_sign2 (gnutls_x509_crq_t crq,
                             gnutls_x509_privkey_t key,
                             gnutls_digest_algorithm_t dig,
                             unsigned int flags);

  int gnutls_x509_crq_print (gnutls_x509_crq_t crq,
                             gnutls_certificate_print_formats_t format,
                             gnutls_datum_t * out);

  int gnutls_x509_crq_verify (gnutls_x509_crq_t crq, unsigned int flags);

  int gnutls_x509_crq_init (gnutls_x509_crq_t * crq);
  void gnutls_x509_crq_deinit (gnutls_x509_crq_t crq);
  int gnutls_x509_crq_import (gnutls_x509_crq_t crq,
                              const gnutls_datum_t * data,
                              gnutls_x509_crt_fmt_t format);

  int gnutls_x509_crq_get_private_key_usage_period (gnutls_x509_crq_t cert, time_t* activation, time_t* expiration, 
                                     unsigned int *critical);

  int gnutls_x509_crq_get_dn (gnutls_x509_crq_t crq, char *buf,
                              size_t * sizeof_buf);
  int gnutls_x509_crq_get_dn_oid (gnutls_x509_crq_t crq, int indx,
                                  void *oid, size_t * sizeof_oid);
  int gnutls_x509_crq_get_dn_by_oid (gnutls_x509_crq_t crq,
                                     const char *oid, int indx,
                                     unsigned int raw_flag, void *buf,
                                     size_t * sizeof_buf);
  int gnutls_x509_crq_set_dn_by_oid (gnutls_x509_crq_t crq,
                                     const char *oid,
                                     unsigned int raw_flag,
                                     const void *data,
                                     unsigned int sizeof_data);
  int gnutls_x509_crq_set_version (gnutls_x509_crq_t crq,
                                   unsigned int version);
  int gnutls_x509_crq_get_version (gnutls_x509_crq_t crq);
  int gnutls_x509_crq_set_key (gnutls_x509_crq_t crq,
                               gnutls_x509_privkey_t key);

  int gnutls_x509_crq_set_challenge_password (gnutls_x509_crq_t crq,
                                              const char *pass);
  int gnutls_x509_crq_get_challenge_password (gnutls_x509_crq_t crq,
                                              char *pass,
                                              size_t * sizeof_pass);

  int gnutls_x509_crq_set_attribute_by_oid (gnutls_x509_crq_t crq,
                                            const char *oid, void *buf,
                                            size_t sizeof_buf);
  int gnutls_x509_crq_get_attribute_by_oid (gnutls_x509_crq_t crq,
                                            const char *oid, int indx,
                                            void *buf, size_t * sizeof_buf);

  int gnutls_x509_crq_export (gnutls_x509_crq_t crq,
                              gnutls_x509_crt_fmt_t format,
                              void *output_data, size_t * output_data_size);
  int gnutls_x509_crq_export2 (gnutls_x509_crq_t crq,
                               gnutls_x509_crt_fmt_t format,
                               gnutls_datum_t * out);

  int gnutls_x509_crt_set_crq (gnutls_x509_crt_t crt, gnutls_x509_crq_t crq);
  int gnutls_x509_crt_set_crq_extensions (gnutls_x509_crt_t crt,
                                          gnutls_x509_crq_t crq);

  int gnutls_x509_crq_set_private_key_usage_period (gnutls_x509_crq_t crq,
                                              time_t activation,
                                              time_t expiration);
  int gnutls_x509_crq_set_key_rsa_raw (gnutls_x509_crq_t crq,
                                       const gnutls_datum_t * m,
                                       const gnutls_datum_t * e);
  int gnutls_x509_crq_set_subject_alt_name (gnutls_x509_crq_t crq,
                                            gnutls_x509_subject_alt_name_t nt,
                                            const void *data,
                                            unsigned int data_size,
                                            unsigned int flags);

  int gnutls_x509_crq_set_key_usage (gnutls_x509_crq_t crq,
                                     unsigned int usage);
  int gnutls_x509_crq_set_basic_constraints (gnutls_x509_crq_t crq,
                                             unsigned int ca,
                                             int pathLenConstraint);
  int gnutls_x509_crq_set_key_purpose_oid (gnutls_x509_crq_t crq,
                                           const void *oid,
                                           unsigned int critical);
  int gnutls_x509_crq_get_key_purpose_oid (gnutls_x509_crq_t crq, int indx,
                                           void *oid, size_t * sizeof_oid,
                                           unsigned int *critical);

  int gnutls_x509_crq_get_extension_data (gnutls_x509_crq_t crq, int indx,
                                          void *data, size_t * sizeof_data);
  int gnutls_x509_crq_get_extension_info (gnutls_x509_crq_t crq, int indx,
                                          void *oid, size_t * sizeof_oid,
                                          unsigned int *critical);
  int gnutls_x509_crq_get_attribute_data (gnutls_x509_crq_t crq, int indx,
                                          void *data, size_t * sizeof_data);
  int gnutls_x509_crq_get_attribute_info (gnutls_x509_crq_t crq, int indx,
                                          void *oid, size_t * sizeof_oid);
  int gnutls_x509_crq_get_pk_algorithm (gnutls_x509_crq_t crq,
                                        unsigned int *bits);

  int gnutls_x509_crq_get_key_id (gnutls_x509_crq_t crq, unsigned int flags,
                                  unsigned char *output_data,
                                  size_t * output_data_size);
  int gnutls_x509_crq_get_key_rsa_raw (gnutls_x509_crq_t crq,
                                       gnutls_datum_t * m,
                                       gnutls_datum_t * e);

  int gnutls_x509_crq_get_key_usage (gnutls_x509_crq_t crq,
                                     unsigned int *key_usage,
                                     unsigned int *critical);
  int gnutls_x509_crq_get_basic_constraints (gnutls_x509_crq_t crq,
                                             unsigned int *critical,
                                             unsigned int *ca, int *pathlen);
  int gnutls_x509_crq_get_subject_alt_name (gnutls_x509_crq_t crq,
                                            unsigned int seq, void *ret,
                                            size_t * ret_size,
                                            unsigned int *ret_type,
                                            unsigned int *critical);
  int gnutls_x509_crq_get_subject_alt_othername_oid (gnutls_x509_crq_t crq,
                                                     unsigned int seq,
                                                     void *ret,
                                                     size_t * ret_size);

  int gnutls_x509_crq_get_extension_by_oid (gnutls_x509_crq_t crq,
                                            const char *oid, int indx,
                                            void *buf, size_t * sizeof_buf,
                                            unsigned int *critical);

  typedef struct gnutls_x509_trust_list_st *gnutls_x509_trust_list_t;

  int
  gnutls_x509_trust_list_init (gnutls_x509_trust_list_t * list, unsigned int size);

  void
  gnutls_x509_trust_list_deinit (gnutls_x509_trust_list_t list, unsigned int all);

  int gnutls_x509_trust_list_get_issuer(gnutls_x509_trust_list_t list,
    gnutls_x509_crt_t cert, gnutls_x509_crt_t* issuer, unsigned int flags);

  int
  gnutls_x509_trust_list_add_cas (gnutls_x509_trust_list_t list, 
    const gnutls_x509_crt_t * clist, int clist_size, unsigned int flags);

  int gnutls_x509_trust_list_add_named_crt (gnutls_x509_trust_list_t list, 
      gnutls_x509_crt_t cert, const void* name, size_t name_size, unsigned int flags);

#define GNUTLS_TL_VERIFY_CRL 1
  int
  gnutls_x509_trust_list_add_crls (gnutls_x509_trust_list_t list, 
    const gnutls_x509_crl_t * crl_list, int crl_size, unsigned int flags,
    unsigned int verification_flags);

  typedef int gnutls_verify_output_function (
    gnutls_x509_crt_t cert,
    gnutls_x509_crt_t issuer, /* The issuer if verification failed 
     * because of him. might be null.
     */
    gnutls_x509_crl_t crl, /* The CRL that caused verification failure 
     * if any. Might be null. 
     */
    unsigned int verification_output);

  int gnutls_x509_trust_list_verify_named_crt (
      gnutls_x509_trust_list_t list,
      gnutls_x509_crt_t cert,
      const void * name, size_t name_size,
      unsigned int flags,
      unsigned int *verify,
      gnutls_verify_output_function func);

  int
  gnutls_x509_trust_list_verify_crt (
    gnutls_x509_trust_list_t list,
    gnutls_x509_crt_t *cert_list,
    unsigned int cert_list_size,
    unsigned int flags,
    unsigned int *verify,
    gnutls_verify_output_function func);

  /* trust list convenience functions */
int
gnutls_x509_trust_list_add_trust_mem(gnutls_x509_trust_list_t list,
                                     const gnutls_datum_t * cas, 
                                     const gnutls_datum_t * crls,
                                     gnutls_x509_crt_fmt_t type,
                                     unsigned int tl_flags,
                                     unsigned int tl_vflags);

int
gnutls_x509_trust_list_add_trust_file(gnutls_x509_trust_list_t list,
                                      const char* ca_file, 
                                      const char* crl_file,
                                      gnutls_x509_crt_fmt_t type,
                                      unsigned int tl_flags,
                                      unsigned int tl_vflags);

int
gnutls_x509_trust_list_add_system_trust(gnutls_x509_trust_list_t list,
                                        unsigned int tl_flags, unsigned int tl_vflags);
#ifdef __cplusplus
}
#endif

#endif                          /* GNUTLS_X509_H */
