Function wc_SignCert_ex 

pub unsafe extern "C" fn wc_SignCert_ex(
    requestSz: c_int,
    sType: c_int,
    buf: *mut byte,
    buffSz: word32,
    keyType: c_int,
    key: *mut c_void,
    rng: *mut WC_RNG,
) -> c_int