/*
 * Copyright (C) 2003, 2004, 2005, 2007 Free Software Foundation
 *
 * Author: Nikos Mavrogiannopoulos
 *
 * This file is part of GNUTLS.
 *
 * The GNUTLS library 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 2.1 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 library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
 * USA
 *
 */

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

#ifndef GNUTLS_X509_H
# define GNUTLS_X509_H

#ifdef __cplusplus
extern "C"
{
#endif

#include <gnutls/gnutls.h>

/* 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_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_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_ANY				"2.5.29.37.0"

/* Certificate handling functions.
 */
  typedef enum gnutls_certificate_import_flags
  {
    /* 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_IMPORT_FAIL_IF_EXCEED = 1
  } 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_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_get_issuer_dn (gnutls_x509_crt_t cert, char *buf,
				     size_t * sizeof_buf);
  int gnutls_x509_crt_get_issuer_dn_oid (gnutls_x509_crt_t cert, int indx,
					 void *oid, size_t * sizeof_oid);
  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 * sizeof_buf);
  int gnutls_x509_crt_get_dn (gnutls_x509_crt_t cert, char *buf,
			      size_t * sizeof_buf);
  int gnutls_x509_crt_get_dn_oid (gnutls_x509_crt_t cert, int indx,
				  void *oid, size_t * sizeof_oid);
  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 * sizeof_buf);
  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_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 *ret, size_t * ret_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);

#define GNUTLS_CRL_REASON_UNUSED 128
#define GNUTLS_CRL_REASON_KEY_COMPROMISE 64
#define GNUTLS_CRL_REASON_CA_COMPROMISE 32
#define GNUTLS_CRL_REASON_AFFILIATION_CHANGED 16
#define GNUTLS_CRL_REASON_SUPERSEEDED 8
#define GNUTLS_CRL_REASON_CESSATION_OF_OPERATION 4
#define GNUTLS_CRL_REASON_CERTIFICATE_HOLD 2
#define GNUTLS_CRL_REASON_PRIVILEGE_WITHDRAWN 1
#define GNUTLS_CRL_REASON_AA_COMPROMISE 32768

  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_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);

  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 *ret,
					    size_t * ret_size,
					    unsigned int *critical);
  int gnutls_x509_crt_get_subject_alt_name2 (gnutls_x509_crt_t cert,
                                unsigned int seq, void *ret, size_t * ret_size, 
                                unsigned int* ret_type, unsigned int *critical);
                                                                                                                                                        
  int gnutls_x509_crt_get_subject_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,
					     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_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);

  /* Read extensions by OID. */
  int gnutls_x509_crt_get_extension_oid (gnutls_x509_crt_t cert, int indx,
					 void *oid, size_t * sizeof_oid);
  int gnutls_x509_crt_get_extension_by_oid (gnutls_x509_crt_t cert,
					    const char *oid, int indx,
					    void *buf,
					    size_t * sizeof_buf,
					    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 * sizeof_oid,
					  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_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, 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 *avast);

  int gnutls_x509_dn_init (gnutls_x509_dn_t * dn);

  int gnutls_x509_dn_import (gnutls_x509_dn_t odn,
                             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);

  void gnutls_x509_dn_deinit (gnutls_x509_dn_t idn);


/* 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_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);

/* CRL writing.
 */
  int gnutls_x509_crl_set_version (gnutls_x509_crl_t crl,
				   unsigned int version);
  int gnutls_x509_crl_sign (gnutls_x509_crl_t crl,
			    gnutls_x509_crt_t issuer,
			    gnutls_x509_privkey_t issuer_key);
  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, unsigned int flags);
  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);


/* 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_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 * crt);
  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.
 */
  typedef enum gnutls_certificate_verify_flags
  {
    /* 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_CA_SIGN = 1,

    /* Allow only trusted CA certificates that have 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.
     */
    GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT = 2,

    /* If a certificate is not signed by anyone trusted but exists in
     * the trusted CA list do not treat it as trusted.
     */
    GNUTLS_VERIFY_DO_NOT_ALLOW_SAME = 4,

    /* 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_ANY_X509_V1_CA_CRT = 8,

    /* Allow certificates to be signed using the broken MD2 algorithm.
     */
    GNUTLS_VERIFY_ALLOW_SIGN_RSA_MD2 = 16,

    /* Allow certificates to be signed using the broken MD5 algorithm.
     */
    GNUTLS_VERIFY_ALLOW_SIGN_RSA_MD5 = 32
  } 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 * sizeof_buf);

  int gnutls_x509_crt_get_key_purpose_oid (gnutls_x509_crt_t cert,
					   int indx, void *oid,
					   size_t * sizeof_oid,
					   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.
 */
  typedef enum gnutls_pkcs_encrypt_flags_t
  {
    GNUTLS_PKCS_PLAIN = 1,	/* if set the private key will not
				 * be encrypted.
				 */
    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_encrypt_flags_t;

#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

  int gnutls_x509_privkey_init (gnutls_x509_privkey_t * key);
  void gnutls_x509_privkey_deinit (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 *pass, 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_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_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_export (gnutls_x509_privkey_t key,
				  gnutls_x509_crt_fmt_t format,
				  void *output_data,
				  size_t * output_data_size);
  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_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);

/* Signing stuff.
 */
  int gnutls_x509_privkey_sign_data (gnutls_x509_privkey_t key,
				     gnutls_digest_algorithm_t digest,
				     unsigned int flags,
				     const gnutls_datum_t * data,
				     void *signature,
				     size_t * signature_size);
  int gnutls_x509_privkey_verify_data (gnutls_x509_privkey_t key,
				       unsigned int flags,
				       const gnutls_datum_t * data,
				       const gnutls_datum_t * signature);
  int gnutls_x509_crt_verify_data (gnutls_x509_crt_t crt,
				   unsigned int flags,
				   const gnutls_datum_t * data,
				   const gnutls_datum_t * signature);

  int gnutls_x509_privkey_sign_hash (gnutls_x509_privkey_t key,
				     const gnutls_datum_t * hash,
				     gnutls_datum_t * signature);


/* Certificate request stuff.
 */
  struct gnutls_x509_crq_int;
  typedef struct gnutls_x509_crq_int *gnutls_x509_crq_t;

  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_pk_algorithm (gnutls_x509_crq_t crq,
					unsigned int *bits);
  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 *name,
				     unsigned int sizeof_name);
  int gnutls_x509_crq_set_version (gnutls_x509_crq_t crq,
				   unsigned int version);
  int gnutls_x509_crq_set_key (gnutls_x509_crq_t crq,
			       gnutls_x509_privkey_t key);
  int gnutls_x509_crq_sign2 (gnutls_x509_crq_t crq,
			     gnutls_x509_privkey_t key,
			     gnutls_digest_algorithm_t, unsigned int flags);
  int gnutls_x509_crq_sign (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_crt_set_crq (gnutls_x509_crt_t crt, gnutls_x509_crq_t crq);



#ifdef __cplusplus
}
#endif
#endif				/* GNUTLS_X509_H */
