text: /**
   * @file certificate.h Public-Key Certificate API
   * @ingroup core
   * @see @ref certificate-signals
   * @since 2.2.0
   */
  
  /*
   *
   * purple
   *
   * Purple is the legal property of its developers, whose names are too numerous
   * to list here.  Please refer to the COPYRIGHT file distributed with this
   * source distribution.
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2 of the License, or
   * (at your option) any later version.
   *
   * This program 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 General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111-1301  USA
   */
  
  #ifndef _PURPLE_CERTIFICATE_H
  #define _PURPLE_CERTIFICATE_H
  
  #include <time.h>
  
  #include <glib.h>
  
  #ifdef __cplusplus
  extern "C" {
  #endif /* __cplusplus */
  
  
  typedef enum
  {
  	PURPLE_CERTIFICATE_INVALID = 0,
  	PURPLE_CERTIFICATE_VALID = 1
  } PurpleCertificateVerificationStatus;
  
  typedef struct _PurpleCertificate PurpleCertificate;
  typedef struct _PurpleCertificatePool PurpleCertificatePool;
  typedef struct _PurpleCertificateScheme PurpleCertificateScheme;
  typedef struct _PurpleCertificateVerifier PurpleCertificateVerifier;
  typedef struct _PurpleCertificateVerificationRequest PurpleCertificateVerificationRequest;
  
  /**
   * Callback function for the results of a verification check
   * @param st       Status code
   * @param userdata User-defined data
   */
  typedef void (*PurpleCertificateVerifiedCallback)
  		(PurpleCertificateVerificationStatus st,
  		 gpointer userdata);
  
  /** A certificate instance
   *
   *  An opaque data structure representing a single certificate under some
   *  CertificateScheme
   */
  struct _PurpleCertificate
  {
  	/** Scheme this certificate is under */
  	PurpleCertificateScheme * scheme;
  	/** Opaque pointer to internal data */
  	gpointer data;
  };
  
  /**
   * Database for retrieval or storage of Certificates
   *
   * More or less a hash table; all lookups and writes are controlled by a string
   * key.
   */
  struct _PurpleCertificatePool
  {
  	/** Scheme this Pool operates for */
  	gchar *scheme_name;
  	/** Internal name to refer to the pool by */
  	gchar *name;
  
  	/** User-friendly name for this type
  	 *  ex: N_("SSL Servers")
  	 *  When this is displayed anywhere, it should be i18ned
  	 *  ex: _(pool->fullname)
  	 */
  	gchar *fullname;
  
  	/** Internal pool data */
  	gpointer data;
  
  	/**
  	 * Set up the Pool's internal state
  	 *
  	 * Upon calling purple_certificate_register_pool() , this function will
  	 * be called. May be NULL.
  	 * @return TRUE if the initialization succeeded, otherwise FALSE
  	 */
  	gboolean (* init)(void);
  
  	/**
  	 * Uninit the Pool's internal state
  	 *
  	 * Will be called by purple_certificate_unregister_pool() . May be NULL
  	 */
  	void (* uninit)(void);
  
  	/** Check for presence of a certificate in the pool using unique ID */
  	gboolean (* cert_in_pool)(const gchar *id);
  	/** Retrieve a PurpleCertificate from the pool */
  	PurpleCertificate * (* get_cert)(const gchar *id);
  	/** Add a certificate to the pool. Must overwrite any other
  	 *  certificates sharing the same ID in the pool.
  	 *  @return TRUE if the operation succeeded, otherwise FALSE
  	 */
  	gboolean (* put_cert)(const gchar *id, PurpleCertificate *crt);
  	/** Delete a certificate from the pool */
  	gboolean (* delete_cert)(const gchar *id);
  
  	/** Returns a list of IDs stored in the pool */
  	GList * (* get_idlist)(void);
  
  	void (*_purple_reserved1)(void);
  	void (*_purple_reserved2)(void);
  	void (*_purple_reserved3)(void);
  	void (*_purple_reserved4)(void);
  };
  
  /** A certificate type
   *
   *  A CertificateScheme must implement all of the fields in the structure,
   *  and register it using purple_certificate_register_scheme()
   *
   *  There may be only ONE CertificateScheme provided for each certificate
   *  type, as specified by the "name" field.
   */
  struct _PurpleCertificateScheme
  {
  	/** Name of the certificate type
  	 *  ex: "x509", "pgp", etc.
  	 *  This must be globally unique - you may not register more than one
  	 *  CertificateScheme of the same name at a time.
  	 */
  	gchar * name;
  
  	/** User-friendly name for this type
  	 *  ex: N_("X.509 Certificates")
  	 *  When this is displayed anywhere, it should be i18ned
  	 *  ex: _(scheme->fullname)
  	 */
  	gchar * fullname;
  
  	/** Imports a certificate from a file
  	 *
  	 *  @param filename   File to import the certificate from
  	 *  @return           Pointer to the newly allocated Certificate struct
  	 *                    or NULL on failure.
  	 */
  	PurpleCertificate * (* import_certificate)(const gchar * filename);
  
  	/**
  	 * Exports a certificate to a file
  	 *
  	 * @param filename    File to export the certificate to
  	 * @param crt         Certificate to export
  	 * @return TRUE if the export succeeded, otherwise FALSE
  	 * @see purple_certificate_export()
  	 */
  	gboolean (* export_certificate)(const gchar *filename, PurpleCertificate *crt);
  
  	/**
  	 * Duplicates a certificate
  	 *
  	 * Certificates are generally assumed to be read-only, so feel free to
  	 * do any sort of reference-counting magic you want here. If this ever
  	 * changes, please remember to change the magic accordingly.
  	 * @return Reference to the new copy
  	 */
  	PurpleCertificate * (* copy_certificate)(PurpleCertificate *crt);
  
  	/** Destroys and frees a Certificate structure
  	 *
  	 *  Destroys a Certificate's internal data structures and calls
  	 *  free(crt)
  	 *
  	 *  @param crt  Certificate instance to be destroyed. It WILL NOT be
  	 *              destroyed if it is not of the correct
  	 *              CertificateScheme. Can be NULL
  	 */
  	void (* destroy_certificate)(PurpleCertificate * crt);
  
  	/** Find whether "crt" has a valid signature from issuer "issuer"
  	 *  @see purple_certificate_signed_by() */
  	gboolean (*signed_by)(PurpleCertificate *crt, PurpleCertificate *issuer);
  	/**
  	 * Retrieves the certificate public key fingerprint using SHA1
  	 *
  	 * @param crt   Certificate instance
  	 * @return Binary representation of SHA1 hash - must be freed using
  	 *         g_byte_array_free()
  	 */
  	GByteArray * (* get_fingerprint_sha1)(PurpleCertificate *crt);
  
  	/**
  	 * Retrieves a unique certificate identifier
  	 *
  	 * @param crt   Certificate instance
  	 * @return Newly allocated string that can be used to uniquely
  	 *         identify the certificate.
  	 */
  	gchar * (* get_unique_id)(PurpleCertificate *crt);
  
  	/**
  	 * Retrieves a unique identifier for the certificate's issuer
  	 *
  	 * @param crt   Certificate instance
  	 * @return Newly allocated string that can be used to uniquely
  	 *         identify the issuer's certificate.
  	 */
  	gchar * (* get_issuer_unique_id)(PurpleCertificate *crt);
  
  	/**
  	 * Gets the certificate subject's name
  	 *
  	 * For X.509, this is the "Common Name" field, as we're only using it
  	 * for hostname verification at the moment
  	 *
  	 * @see purple_certificate_get_subject_name()
  	 *
  	 * @param crt   Certificate instance
  	 * @return Newly allocated string with the certificate subject.
  	 */
  	gchar * (* get_subject_name)(PurpleCertificate *crt);
  
  	/**
  	 * Check the subject name against that on the certificate
  	 * @see purple_certificate_check_subject_name()
  	 * @return TRUE if it is a match, else FALSE
  	 */
  	gboolean (* check_subject_name)(PurpleCertificate *crt, const gchar *name);
  
  	/** Retrieve the certificate activation/expiration times */
  	gboolean (* get_times)(PurpleCertificate *crt, time_t *activation, time_t *expiration);
  
  	/** Imports certificates from a file
  	 *
  	 *  @param filename   File to import the certificates from
  	 *  @return           GSList of pointers to the newly allocated Certificate structs
  	 *                    or NULL on failure.
  	 */
  	GSList * (* import_certificates)(const gchar * filename);
  
  	void (*_purple_reserved1)(void);
  	void (*_purple_reserved2)(void);
  	void (*_purple_reserved3)(void);
  };
  
  /** A set of operations used to provide logic for verifying a Certificate's
   *  authenticity.
   *
   * A Verifier provider must fill out these fields, then register it using
   * purple_certificate_register_verifier()
   *
   * The (scheme_name, name) value must be unique for each Verifier - you may not
   * register more than one Verifier of the same name for each Scheme
   */
  struct _PurpleCertificateVerifier
  {
  	/** Name of the scheme this Verifier operates on
  	 *
  	 * The scheme will be looked up by name when a Request is generated
  	 * using this Verifier
  	 */
  	gchar *scheme_name;
  
  	/** Name of the Verifier - case insensitive */
  	gchar *name;
  
  	/**
  	 * Start the verification process
  	 *
  	 * To be called from purple_certificate_verify once it has
  	 * constructed the request. This will use the information in the
  	 * given VerificationRequest to check the certificate and callback
  	 * the requester with the verification results.
  	 *
  	 * @param vrq      Request to process
  	 */
  	void (* start_verification)(PurpleCertificateVerificationRequest *vrq);
  
  	/**
  	 * Destroy a completed Request under this Verifier
  	 * The function pointed to here is only responsible for cleaning up
  	 * whatever PurpleCertificateVerificationRequest::data points to.
  	 * It should not call free(vrq)
  	 *
  	 * @param vrq       Request to destroy
  	 */
  	void (* destroy_request)(PurpleCertificateVerificationRequest *vrq);
  
  	void (*_purple_reserved1)(void);
  	void (*_purple_reserved2)(void);
  	void (*_purple_reserved3)(void);
  	void (*_purple_reserved4)(void);
  };
  
  /** Structure for a single certificate request
   *
   *  Useful for keeping track of the state of a verification that involves
   *  several steps
   */
  struct _PurpleCertificateVerificationRequest
  {
  	/** Reference to the verification logic used */
  	PurpleCertificateVerifier *verifier;
  	/** Reference to the scheme used.
  	 *
  	 * This is looked up from the Verifier when the Request is generated
  	 */
  	PurpleCertificateScheme *scheme;
  
  	/**
  	 * Name to check that the certificate is issued to
  	 *
  	 * For X.509 certificates, this is the Common Name
  	 */
  	gchar *subject_name;
  
  	/** List of certificates in the chain to be verified (such as that returned by purple_ssl_get_peer_certificates )
  	 *
  	 * This is most relevant for X.509 certificates used in SSL sessions.
  	 * The list order should be: certificate, issuer, issuer's issuer, etc.
  	 */
  	GList *cert_chain;
  
  	/** Internal data used by the Verifier code */
  	gpointer data;
  
  	/** Function to call with the verification result */
  	PurpleCertificateVerifiedCallback cb;
  	/** Data to pass to the post-verification callback */
  	gpointer cb_data;
  };
  
  /*****************************************************************************/
  /** @name Certificate Verification Functions                                 */
  /*****************************************************************************/
  /*@{*/
  
  /**
   * Constructs a verification request and passed control to the specified Verifier
   *
   * It is possible that the callback will be called immediately upon calling
   * this function. Plan accordingly.
   *
   * @param verifier      Verification logic to use.
   *                      @see purple_certificate_find_verifier()
   *
   * @param subject_name  Name that should match the first certificate in the
   *                      chain for the certificate to be valid. Will be strdup'd
   *                      into the Request struct
   *
   * @param cert_chain    Certificate chain to check. If there is more than one
   *                      certificate in the chain (X.509), the peer's
   *                      certificate comes first, then the issuer/signer's
   *                      certificate, etc. The whole list is duplicated into the
   *                      Request struct.
   *
   * @param cb            Callback function to be called with whether the
   *                      certificate was approved or not.
   * @param cb_data       User-defined data for the above.
   */
  void
  purple_certificate_verify (PurpleCertificateVerifier *verifier,
  			   const gchar *subject_name, GList *cert_chain,
  			   PurpleCertificateVerifiedCallback cb,
  			   gpointer cb_data);
  
  /**
   * Completes and destroys a VerificationRequest
   *
   * @param vrq           Request to conclude
   * @param st            Success/failure code to pass to the request's
   *                      completion callback.
   */
  void
  purple_certificate_verify_complete(PurpleCertificateVerificationRequest *vrq,
  				   PurpleCertificateVerificationStatus st);
  
  /*@}*/
  
  /*****************************************************************************/
  /** @name Certificate Functions                                              */
  /*****************************************************************************/
  /*@{*/
  
  /**
   * Makes a duplicate of a certificate
   *
   * @param crt        Instance to duplicate
   * @return Pointer to new instance
   */
  PurpleCertificate *
  purple_certificate_copy(PurpleCertificate *crt);
  
  /**
   * Duplicates an entire list of certificates
   *
   * @param crt_list   List to duplicate
   * @return New list copy
   */
  GList *
  purple_certificate_copy_list(GList *crt_list);
  
  /**
   * Destroys and free()'s a Certificate
   *
   * @param crt        Instance to destroy. May be NULL.
   */
  void
  purple_certificate_destroy (PurpleCertificate *crt);
  
  /**
   * Destroy an entire list of Certificate instances and the containing list
   *
   * @param crt_list   List of certificates to destroy. May be NULL.
   */
  void
  purple_certificate_destroy_list (GList * crt_list);
  
  /**
   * Check whether 'crt' has a valid signature made by 'issuer'
   *
   * @param crt        Certificate instance to check signature of
   * @param issuer     Certificate thought to have signed 'crt'
   *
   * @return TRUE if 'crt' has a valid signature made by 'issuer',
   *         otherwise FALSE
   * @todo Find a way to give the reason (bad signature, not the issuer, etc.)
   */
  gboolean
  purple_certificate_signed_by(PurpleCertificate *crt, PurpleCertificate *issuer);
  
  /**
   * Check that a certificate chain is valid and, if not, the failing certificate.
   *
   * Uses purple_certificate_signed_by() to verify that each PurpleCertificate
   * in the chain carries a valid signature from the next. A single-certificate
   * chain is considered to be valid.
   *
   * @param chain      List of PurpleCertificate instances comprising the chain,
   *                   in the order certificate, issuer, issuer's issuer, etc.
   * @param failing    A pointer to a PurpleCertificate*. If not NULL, if the
   *                   chain fails to validate, this will be set to the
   *                   certificate whose signature could not be validated.
   * @return TRUE if the chain is valid. See description.
   *
   * @since 2.6.0
   * @deprecated  This function will become
   *              purple_certificate_check_signature_chain in 3.0.0
   */
  gboolean
  purple_certificate_check_signature_chain_with_failing(GList *chain,
  		PurpleCertificate **failing);
  
  /**
   * Check that a certificate chain is valid
   *
   * Uses purple_certificate_signed_by() to verify that each PurpleCertificate
   * in the chain carries a valid signature from the next. A single-certificate
   * chain is considered to be valid.
   *
   * @param chain      List of PurpleCertificate instances comprising the chain,
   *                   in the order certificate, issuer, issuer's issuer, etc.
   * @return TRUE if the chain is valid. See description.
   * @todo Specify which certificate in the chain caused a failure
   * @deprecated  This function will be removed in 3.0.0 and replaced with
   *              purple_certificate_check_signature_chain_with_failing
   */
  gboolean
  purple_certificate_check_signature_chain(GList *chain);
  
  /**
   * Imports a PurpleCertificate from a file
   *
   * @param scheme      Scheme to import under
   * @param filename    File path to import from
   * @return Pointer to a new PurpleCertificate, or NULL on failure
   */
  PurpleCertificate *
  purple_certificate_import(PurpleCertificateScheme *scheme, const gchar *filename);
  
  /**
   * Imports a list of PurpleCertificates from a file
   *
   * @param scheme      Scheme to import under
   * @param filename    File path to import from
   * @return Pointer to a GSList of new PurpleCertificates, or NULL on failure
   */
  GSList *
  purple_certificates_import(PurpleCertificateScheme *scheme, const gchar *filename);
  
  /**
   * Exports a PurpleCertificate to a file
   *
   * @param filename    File to export the certificate to
   * @param crt         Certificate to export
   * @return TRUE if the export succeeded, otherwise FALSE
   */
  gboolean
  purple_certificate_export(const gchar *filename, PurpleCertificate *crt);
  
  
  /**
   * Retrieves the certificate public key fingerprint using SHA1.
   *
   * @param crt        Certificate instance
   * @return Binary representation of the hash. You are responsible for free()ing
   *         this.
   * @see purple_base16_encode_chunked()
   */
  GByteArray *
  purple_certificate_get_fingerprint_sha1(PurpleCertificate *crt);
  
  /**
   * Get a unique identifier for the certificate
   *
   * @param crt        Certificate instance
   * @return String representing the certificate uniquely. Must be g_free()'ed
   */
  gchar *
  purple_certificate_get_unique_id(PurpleCertificate *crt);
  
  /**
   * Get a unique identifier for the certificate's issuer
   *
   * @param crt        Certificate instance
   * @return String representing the certificate's issuer uniquely. Must be
   *         g_free()'ed
   */
  gchar *
  purple_certificate_get_issuer_unique_id(PurpleCertificate *crt);
  
  /**
   * Gets the certificate subject's name
   *
   * For X.509, this is the "Common Name" field, as we're only using it
   * for hostname verification at the moment
   *
   * @param crt   Certificate instance
   * @return Newly allocated string with the certificate subject.
   */
  gchar *
  purple_certificate_get_subject_name(PurpleCertificate *crt);
  
  /**
   * Check the subject name against that on the certificate
   * @param crt   Certificate instance
   * @param name  Name to check.
   * @return TRUE if it is a match, else FALSE
   */
  gboolean
  purple_certificate_check_subject_name(PurpleCertificate *crt, const gchar *name);
  
  /**
   * Get the expiration/activation times.
   *
   * @param crt          Certificate instance
   * @param activation   Reference to store the activation time at. May be NULL
   *                     if you don't actually want it.
   * @param expiration   Reference to store the expiration time at. May be NULL
   *                     if you don't actually want it.
   * @return TRUE if the requested values were obtained, otherwise FALSE.
   */
  gboolean
  purple_certificate_get_times(PurpleCertificate *crt, time_t *activation, time_t *expiration);
  
  /*@}*/
  
  /*****************************************************************************/
  /** @name Certificate Pool Functions                                         */
  /*****************************************************************************/
  /*@{*/
  /**
   * Helper function for generating file paths in ~/.purple/certificates for
   * CertificatePools that use them.
   *
   * All components will be escaped for filesystem friendliness.
   *
   * @param pool   CertificatePool to build a path for
   * @param id     Key to look up a Certificate by. May be NULL.
   * @return A newly allocated path of the form
   *         ~/.purple/certificates/scheme_name/pool_name/unique_id
   */
  gchar *
  purple_certificate_pool_mkpath(PurpleCertificatePool *pool, const gchar *id);
  
  /**
   * Determines whether a pool can be used.
   *
   * Checks whether the associated CertificateScheme is loaded.
   *
   * @param pool   Pool to check
   *
   * @return TRUE if the pool can be used, otherwise FALSE
   */
  gboolean
  purple_certificate_pool_usable(PurpleCertificatePool *pool);
  
  /**
   * Looks up the scheme the pool operates under
   *
   * @param pool   Pool to get the scheme of
   *
   * @return Pointer to the pool's scheme, or NULL if it isn't loaded.
   * @see purple_certificate_pool_usable()
   */
  PurpleCertificateScheme *
  purple_certificate_pool_get_scheme(PurpleCertificatePool *pool);
  
  /**
   * Check for presence of an ID in a pool.
   * @param pool   Pool to look in
   * @param id     ID to look for
   * @return TRUE if the ID is in the pool, else FALSE
   */
  gboolean
  purple_certificate_pool_contains(PurpleCertificatePool *pool, const gchar *id);
  
  /**
   * Retrieve a certificate from a pool.
   * @param pool   Pool to fish in
   * @param id     ID to look up
   * @return Retrieved certificate, or NULL if it wasn't there
   */
  PurpleCertificate *
  purple_certificate_pool_retrieve(PurpleCertificatePool *pool, const gchar *id);
  
  /**
   * Add a certificate to a pool
   *
   * Any pre-existing certificate of the same ID will be overwritten.
   *
   * @param pool   Pool to add to
   * @param id     ID to store the certificate with
   * @param crt    Certificate to store
   * @return TRUE if the operation succeeded, otherwise FALSE
   */
  gboolean
  purple_certificate_pool_store(PurpleCertificatePool *pool, const gchar *id, PurpleCertificate *crt);
  
  /**
   * Remove a certificate from a pool
   *
   * @param pool   Pool to remove from
   * @param id     ID to remove
   * @return TRUE if the operation succeeded, otherwise FALSE
   */
  gboolean
  purple_certificate_pool_delete(PurpleCertificatePool *pool, const gchar *id);
  
  /**
   * Get the list of IDs currently in the pool.
   *
   * @param pool   Pool to enumerate
   * @return GList pointing to newly-allocated id strings. Free using
   *         purple_certificate_pool_destroy_idlist()
   */
  GList *
  purple_certificate_pool_get_idlist(PurpleCertificatePool *pool);
  
  /**
   * Destroys the result given by purple_certificate_pool_get_idlist()
   *
   * @param idlist ID List to destroy
   */
  void
  purple_certificate_pool_destroy_idlist(GList *idlist);
  
  /*@}*/
  
  /*****************************************************************************/
  /** @name Certificate Subsystem API                                          */
  /*****************************************************************************/
  /*@{*/
  
  /**
   * Initialize the certificate system
   */
  void
  purple_certificate_init(void);
  
  /**
   * Un-initialize the certificate system
   */
  void
  purple_certificate_uninit(void);
  
  /**
   * Get the Certificate subsystem handle for signalling purposes
   */
  gpointer
  purple_certificate_get_handle(void);
  
  /** Look up a registered CertificateScheme by name
   * @param name   The scheme name. Case insensitive.
   * @return Pointer to the located Scheme, or NULL if it isn't found.
   */
  PurpleCertificateScheme *
  purple_certificate_find_scheme(const gchar *name);
  
  /**
   * Get all registered CertificateSchemes
   *
   * @return GList pointing to all registered CertificateSchemes . This value
   *         is owned by libpurple
   */
  GList *
  purple_certificate_get_schemes(void);
  
  /** Register a CertificateScheme with libpurple
   *
   * No two schemes can be registered with the same name; this function enforces
   * that.
   *
   * @param scheme  Pointer to the scheme to register.
   * @return TRUE if the scheme was successfully added, otherwise FALSE
   */
  gboolean
  purple_certificate_register_scheme(PurpleCertificateScheme *scheme);
  
  /** Unregister a CertificateScheme from libpurple
   *
   * @param scheme    Scheme to unregister.
   *                  If the scheme is not registered, this is a no-op.
   *
   * @return TRUE if the unregister completed successfully
   */
  gboolean
  purple_certificate_unregister_scheme(PurpleCertificateScheme *scheme);
  
  /** Look up a registered PurpleCertificateVerifier by scheme and name
   * @param scheme_name  Scheme name. Case insensitive.
   * @param ver_name     The verifier name. Case insensitive.
   * @return Pointer to the located Verifier, or NULL if it isn't found.
   */
  PurpleCertificateVerifier *
  purple_certificate_find_verifier(const gchar *scheme_name, const gchar *ver_name);
  
  /**
   * Get the list of registered CertificateVerifiers
   *
   * @return GList of all registered PurpleCertificateVerifier. This value
   *         is owned by libpurple
   */
  GList *
  purple_certificate_get_verifiers(void);
  
  /**
   * Register a CertificateVerifier with libpurple
   *
   * @param vr     Verifier to register.
   * @return TRUE if register succeeded, otherwise FALSE
   */
  gboolean
  purple_certificate_register_verifier(PurpleCertificateVerifier *vr);
  
  /**
   * Unregister a CertificateVerifier with libpurple
   *
   * @param vr     Verifier to unregister.
   * @return TRUE if unregister succeeded, otherwise FALSE
   */
  gboolean
  purple_certificate_unregister_verifier(PurpleCertificateVerifier *vr);
  
  /** Look up a registered PurpleCertificatePool by scheme and name
   * @param scheme_name  Scheme name. Case insensitive.
   * @param pool_name    Pool name. Case insensitive.
   * @return Pointer to the located Pool, or NULL if it isn't found.
   */
  PurpleCertificatePool *
  purple_certificate_find_pool(const gchar *scheme_name, const gchar *pool_name);
  
  /**
   * Get the list of registered Pools
   *
   * @return GList of all registered PurpleCertificatePool s. This value
   *         is owned by libpurple
   */
  GList *
  purple_certificate_get_pools(void);
  
  /**
   * Register a CertificatePool with libpurple and call its init function
   *
   * @param pool   Pool to register.
   * @return TRUE if the register succeeded, otherwise FALSE
   */
  gboolean
  purple_certificate_register_pool(PurpleCertificatePool *pool);
  
  /**
   * Unregister a CertificatePool with libpurple and call its uninit function
   *
   * @param pool   Pool to unregister.
   * @return TRUE if the unregister succeeded, otherwise FALSE
   */
  gboolean
  purple_certificate_unregister_pool(PurpleCertificatePool *pool);
  
  /*@}*/
  
  
  /**
   * Displays a window showing X.509 certificate information
   *
   * @param crt    Certificate under an "x509" Scheme
   * @todo Will break on CA certs, as they have no Common Name
   */
  void
  purple_certificate_display_x509(PurpleCertificate *crt);
  
  /**
   * Add a search path for certificates.
   *
   * @param path   Path to search for certificates.
   */
  void purple_certificate_add_ca_search_path(const char *path);
  
  #ifdef __cplusplus
  }
  #endif /* __cplusplus */
  
  #endif /* _PURPLE_CERTIFICATE_H */
  