Function AddRoundKey

payload.cpp:343–353

This function adds the round key to state. The round key is added to the state by an XOR function.

// This function adds the round key to state.
// The round key is added to the state by an XOR function.
static void AddRoundKey(uint8_t round, state_t* state, const uint8_t* RoundKey)
{
  uint8_t i,j;
  for (i = 0; i < 4; ++i)
  {
    for (j = 0; j < 4; ++j)
    {
      (*state)[i][j] ^= RoundKey[(round * Nb * 4) + (i * Nb) + j];
    }
  }
}

// The SubBytes Function Substitutes the values in the
// state matrix with values in an S-box.