@Test
    public void testPermutate1() {
        int[] testExpansionTabel = new int[]{
                1, 2, 3, 4, 5, 6,
                7, 8, 9, 10, 11, 12,
                13, 14, 15, 16, 17, 18,
                19, 20, 21, 22, 23, 24,
                25, 26, 27, 28, 29, 30,
                31, 32, 1, 2, 3, 4,
                5, 6, 7, 8, 9, 10,
                11, 12, 13, 14, 15, 16
        };
        byte[] block = new byte[]{1, 2, 3, 4};
        byte[] expected = new byte[]{1, 2, 3, 4, 1, 2};
        
        byte[] result = ByteHelper.permutate(block, testExpansionTabel);
        
        for (int i = 0; i < block.length; i++) {
            assertEquals(result[i], expected[i]);
        }
    }