pub unsafe extern "system" fn PstValidate(
    ptargetname: *const UNICODE_STRING,
    bisclient: BOOL,
    prequestedissuancepolicy: *const CERT_USAGE_MATCH,
    phadditionalcertstore: *const HCERTSTORE,
    pcert: *const CERT_CONTEXT,
    pprovguid: *mut GUID,
) -> NTSTATUS