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gnutls_certificate_set_retrieve_function2(3)  gnutls gnutls_certificate_set_retrieve_function2(3)

       gnutls_certificate_set_retrieve_function2 - API function

       #include <gnutls/abstract.h>

       void    gnutls_certificate_set_retrieve_function2(gnutls_certificate_credentials_t   cred,
       gnutls_certificate_retrieve_function2 * func);

       gnutls_certificate_credentials_t cred
		   is a gnutls_certificate_credentials_t structure.

       gnutls_certificate_retrieve_function2 * func
		   is the callback function

       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_algorithm_t*   pk_algos,   int
       pk_algos_length,  gnutls_pcert_st**  pcert, unsigned int *pcert_length, gnutls_privkey_t *

	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

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

	pcert should contain a single certificate and public or a list of them.

	pcert_length is the size of the previous list.

	pkey is the private key.

       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.


       Report bugs to <bug-gnutls@gnu.org>.
       General guidelines for reporting bugs: http://www.gnu.org/gethelp/
       GnuTLS home page: http://www.gnu.org/software/gnutls/

       Copyright (C) 2012 Free Software Foundation, Inc..
       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.

       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.	As an alternative you may obtain the man-
       ual from:


gnutls					      3.1.15 gnutls_certificate_set_retrieve_function2(3)
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