NAME¶gnutls_certificate_set_retrieve_function3 - API function
void gnutls_certificate_set_retrieve_function3(gnutls_certificate_credentials_t cred, gnutls_certificate_retrieve_function3 * func);
- gnutls_certificate_credentials_t cred
- is a gnutls_certificate_credentials_t type.
- gnutls_certificate_retrieve_function3 * func
- is the callback function
DESCRIPTION¶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 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 algorithms.
The callback should fill-in the following values.
pcert should contain an allocated list of certificates and public keys. 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.
REPORTING BUGS¶Report bugs to <email@example.com>.
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SEE ALSO¶The full documentation for gnutls is maintained as a Texinfo manual. If the /usr/share/doc/gnutls/ directory does not contain the HTML form visit