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gnutls_certificate_set_retrieve_fungnutls_certificate_set_retrieve_function(3)

NAME
       gnutls_certificate_set_retrieve_function - API function

SYNOPSIS
       #include <gnutls/gnutls.h>

       void   gnutls_certificate_set_retrieve_function(gnutls_certificate_cre‐
       dentials_t cred, gnutls_certificate_retrieve_function * func);

ARGUMENTS
       gnutls_certificate_credentials_t cred
		   is a gnutls_certificate_credentials_t structure.

       gnutls_certificate_retrieve_function * func
		   is the callback function

DESCRIPTION
       This function sets a callback to be called in  order  to	 retrieve  the
       certificate to be used in the handshake.

       The callback's function prototype is: int (*callback)(gnutls_session_t,
       const  gnutls_datum_t*  req_ca_dn,  int	nreqs,	const  gnutls_pk_algo‐
       rithm_t* pk_algos, int pk_algos_length, gnutls_retr2_st* st);

       req_ca_cert  is	only used in X.509 certificates.  Contains a list with
       the CA names that the server considers  trusted.	  Normally  we	should
       send  a certificate that is signed by one of these CAs. These names are
       DER  encoded.  To  get  a  more	meaningful  value  use	the   function
       gnutls_x509_rdn_get().

       pk_algos contains a list with server's acceptable signature algorithms.
       The certificate returned should support the server's given algorithms.

       st should contain the certificates and private keys.

       If the callback function is provided then gnutls will call it,  in  the
       handshake, after the certificate request message has been received.

       In server side pk_algos and req_ca_dn are NULL.

       The  callback  function should set the certificate list to be sent, and
       return 0 on success. If no certificate was selected then the number  of
       certificates  should be set to zero. The value (-1) indicates error and
       the handshake will be terminated.

REPORTING BUGS
       Report	bugs   to    <bug-gnutls@gnu.org>.     GnuTLS	 home	 page:
       http://www.gnu.org/software/gnutls/  General  help  using GNU software:
       http://www.gnu.org/gethelp/

COPYRIGHT
       Copyright © 2008 Free Software Foundation.
       Copying and distribution of this file, with  or	without	 modification,
       are  permitted  in  any	medium	without royalty provided the copyright
       notice and this notice are preserved.

SEE ALSO
       The full documentation for gnutls is maintained as  a  Texinfo  manual.
       If  the	info  and gnutls programs are properly installed at your site,
       the command

	      info gnutls

       should give you access to the complete manual.

gnutls				   gnutls_certificate_set_retrieve_function(3)

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