pub unsafe extern "C" fn wolfSSL_DeriveTlsKeys(
    key_data: *mut c_uchar,
    keyLen: word32,
    ms: *const c_uchar,
    msLen: word32,
    sr: *const c_uchar,
    cr: *const c_uchar,
    tls1_2: c_int,
    hash_type: c_int
) -> c_int