text: #define DIM 16
  #define SBOX_SIZE 4
  #define NUM_SBOXES (DIM/SBOX_SIZE)
  
  uint64_t mds[] = {
      0x0000488c,
      0x00002446,
      0x00001223,
      0x0000c11d,
      0x0000c488,
      0x00006244,
      0x00003122,
      0x0000dc11,
      0x00008c48,
      0x00004624,
      0x00002312,
      0x00001dc1,
      0x000088c4,
      0x00004462,
      0x00002231,
      0x000011dc
  };