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gnutls_certificate_set_retrieve_function3 - API function
cred, gnutls_certificate_retrieve_function3 * func);
is a gnutls_certificate_credentials_t type.
gnutls_certificate_retrieve_function3 * func
is the callback function
This function sets a callback to be called in order to retrieve the
certificate and OCSP responses to be used in the handshake. func will
be called only if the peer requests a certificate either during
handshake or during post-handshake authentication.
The callback's function prototype is defined in `abstract.h':
int gnutls_certificate_retrieve_function3( gnutls_session_t, const
struct gnutls_cert_retr_st *info, gnutls_pcert_st **certs, unsigned int
*pcert_length, gnutls_ocsp_data_st **ocsp, unsigned int *ocsp_length,
gnutls_privkey_t *privkey, unsigned int *flags);
The info field of the callback contains:
req_ca_dn which is 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
pk_algos contains a list with server's acceptable public key
algorithms. The certificate returned should support the server's given
The callback should fill-in the following values.
pcert should contain an allocated list of certificates and public
pcert_length is the size of the previous list.
ocsp should contain an allocated list of OCSP responses.
ocsp_length is the size of the previous list.
pkey is the private key.
If flags in the callback are set to GNUTLS_CERT_RETR_DEINIT_ALL then
all provided values must be allocated using gnutls_malloc(), and will
be released by gnutls; otherwise they will not be touched by gnutls.
The callback function should set the certificate and OCSP response list
to be sent, and return 0 on success. If no certificates are available,
the pcert_length and ocsp_length should be set to zero. The return
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 <email@example.com>.
Home page: https://www.gnutls.org
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