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[idontwantaname]

wie wärs mit xor ??

Delphi-Quellcode:

function XORCrypt(Password,InputFilePath,OutputFilePath:String):Boolean;
var aktChar: Integer;
   InputFile, OutputFile: File of Byte;
   Buffer:Byte;
begin
  Result := False;

  try
    aktChar := 1;

    AssignFile(InputFile,InputFilePath);
    Reset(InputFile);

    AssignFile(OutputFile,OutputFilePath);
    Rewrite(OutputFile);

    while not Eof(InputFile) do
    begin
      if(aktChar > Length(Password)) then aktChar := 1;
      Read(InputFile,Buffer);
      Buffer := Buffer xor ord(Password[aktChar]);
      Write(OutputFile,Buffer);
      Inc(aktChar);
      Application.ProcessMessages;
    end;
  finally
    CloseFile(InputFile);
    CloseFile(OutputFile);

    Result := True;
  end;
end;