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gnutls_certificate_set_retrieve_function2 - API function
cred, gnutls_certificate_retrieve_function2 * func);
is a gnutls_certificate_credentials_t type.
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 will take control
only if a certificate is requested by the peer.
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 * pkey);
req_ca_dn is only used in X.509 certificates. Contains a list with
the CA names that the server considers trusted. This is a hint and
typically the client should send a certificate that is signed by one of
these CAs. These names, when available, 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 public key
algorithms. The certificate returned should support the server's given
pcert should contain a single certificate and public key or a list of
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.
All the provided by the callback values will not be released or
modified by gnutls.
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. If both certificates are set in the
credentials and a callback is available, the callback takes predence.
Report bugs to <firstname.lastname@example.org>.
Home page: https://www.gnutls.org
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