pub type CallbackMacEncrypt = Option<unsafe extern "C" fn(ssl: *mut WOLFSSL, macOut: *mut c_uchar, macIn: *const c_uchar, macInSz: c_uint, macContent: c_int, macVerify: c_int, encOut: *mut c_uchar, encIn: *const c_uchar, encSz: c_uint, ctx: *mut c_void) -> c_int>;