docs: function AES_Init() {
  	AES_Sbox_Inv = new Array(256);
  	for(var i = 0; i < 256; i++)
  		AES_Sbox_Inv[AES_Sbox[i]] = i;
  
  	AES_ShiftRowTab_Inv = new Array(16);
  	for(var i = 0; i < 16; i++)
  		AES_ShiftRowTab_Inv[AES_ShiftRowTab[i]] = i;
  
  	AES_xtime = new Array(256);
  	for(var i = 0; i < 128; i++) {
  		AES_xtime[i] = i << 1;
  		AES_xtime[128 + i] = (i << 1) ^ 0x1b;
  	}
  }