gnutls_certificate_set_x509_trust_file - API function
int gnutls_certificate_set_x509_trust_file(gnutls_certificate_credentials_t cred, const char * cafile, gnutls_x509_crt_fmt_t type);
This function adds the trusted CAs in order to verify client or server certificates. In case of a client this is not required to be called if the certificates are not verified using gnutls_certificate_verify_peers2(). This function may be called multiple times.
In case of a server the names of the CAs set here will be sent to the client if a certificate request is sent. This can be disabled using gnutls_certificate_send_x509_rdn_sequence().
This function can also accept URLs. In that case it will import all certificates that are marked as trusted. Note that the supported URLs are the ones indicated by gnutls_url_is_supported().
the number of certificates processed
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