pub unsafe extern "C" fn ccm_auth_decrypt(
    ctx: *mut ccm_context,
    length: usize,
    iv: *const c_uchar,
    iv_len: usize,
    add: *const c_uchar,
    add_len: usize,
    input: *const c_uchar,
    output: *mut c_uchar,
    tag: *const c_uchar,
    tag_len: usize
) -> c_int