NAME gnutls_certificate_client_set_retrieve_function - Used to set a call- back to retrieve the certificate

SYNOPSIS #include <gnutls/gnutls.h>

void gnutls_certificate_client_set_retrieve_function(gnutls_certifi- cate_credentials_t cred, gnutls_certificate_client_retrieve_function * func);

ARGUMENTS gnutls_certificate_credentials_t cred is a gnutls_certificate_credentials_t structure.

gnutls_certificate_client_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 callbacks function pro- totype is: int (*callback)(gnutls_session_t, const gnutls_datum_t* req_ca_dn, int nreqs, gnutls_pk_algorithm_t* pk_algos, int pk_algos_length, gnutls_retr_st* st);

st should contain the certificates and private keys.

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 algo- rithms. The certificate returned should support the servers given algorithms.

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

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 <>.

COPYRIGHT Copyright © 2004 Free Software Foundation. Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies.

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_client_set_retrieve_function(3)