pub unsafe extern "C" fn generate_kul(
hashtype: *const oid,
hashtype_len: c_uint,
engineID: *const c_uchar,
engineID_len: size_t,
Ku: *const c_uchar,
ku_len: size_t,
Kul: *mut c_uchar,
kul_len: *mut size_t,
) -> c_int