int gnutls_x509_crt_get_extension_data(gnutls_x509_crt_t cert, int indx, void * data, size_t * sizeof_data);
should contain a gnutls_x509_crt_t structure
Specifies which extension OID to send. Use zero to get the first one.
void * data
a pointer to a structure to hold the data (may be null)
size_t * sizeof_data
initially holds the size of oid
This function will return the requested extension data in the
certificate. The extension data will be stored as a string in the
Use gnutls_x509_crt_get_extension_info() to extract the OID and
critical flag. Use gnutls_x509_crt_get_extension_by_oid() instead,
if you want to get data indexed by the extension OID rather than
On success, GNUTLS_E_SUCCESS (zero) is returned,
otherwise an error code is returned. If you have reached the
last extension available GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE
will be returned.