public String string()
    {
        return ZData.toString(data());
    }
@Test
    public void testString()
    {
        byte[] buf = new byte[1024];
        Arrays.fill(buf, (byte) 0xAA);

        ZDigest digest = new ZDigest();

        digest.update(buf);
        String string = digest.string();
        assertThat(string, is("DEB23807D4FE025E900FE9A9C7D8410C3DDE9671"));
    }