code: function(word,iteration)
  		{
  			/* rotate the 32-bit word 8 bits to the left */
  			word = this.rotate(word);
  			/* apply S-Box substitution on all 4 parts of the 32-bit word */
  			for (var i = 0; i < 4; ++i)
  				word[i] = this.sbox[word[i]];
  			/* XOR the output of the rcon operation with i to the first part (leftmost) only */
  			word[0] = word[0]^this.Rcon[iteration];
  			return word;
  		}
docs: Key Schedule Core