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dentials_t cred, gnutls_certificate_retrieve_function2 * func);
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_algo-
rithm_t* pk_algos, int pk_algos_length, gnutls_pcert_st** pcert,
unsigned int *pcert_length, gnutls_privkey_t * pkey);
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 algo-
rithms. The certificate returned should support the server's given
pcert should contain a single certificate and public 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.
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.