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 servers acceptable signature algorithms. The certificate returned should support the servers 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)