Объясните нубу плиз (L2pdx)

[wimax]

procedure TXorCodingOut.InitKey(const XorKey; Interlude: Byte = 0);
const
  KeyConst: array[0..3] of Byte = ($A1,$6C,$54,$87);
  KeyIntrl: array[0..7] of Byte = ($C8,$27,$93,$01,$A1,$6C,$31,$97);
var key2:array[0..15] of Byte;
begin
  if Interlude <> 0 then begin
    keyLen:=15;
    Move(XorKey,key2,8);
    Move(KeyIntrl,key2[8],8);
  end else begin
    keyLen:=7;
    Move(XorKey,key2,4);
    Move(KeyConst,key2[4],4);
  end;
  Move(key2,GKeyS,16);
  Move(key2,GKeyR,16);
end;