Probleme beim Übersetzen vom C# Code

[Gehstock]

mal ins Blinde übersetzt bitte nicht Steinigen

Delphi-Quellcode:

 for I := 0 to SizeOf(Data) - 1 do
  Begin
    Inc(Key[$100]);
    Key[$101] := Key[$101] + Key[Key[$100] and $FF];
    Temp := Key[Key[$101] and $FF];
    Key[Key[$101] and $FF] := Key[Key[$100] and $FF];
    Key[Key[$100] and $FF] := Temp;
    Data[i] = (byte)(data[i] xor Key[(Key[Key[$101] and $FF] + Key[Key[$100] and $FF]) and $FF]);
  End;
 Result := Data;

Edit: Mist zu Spät