[dr. F.I.N.]

Код:

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

const
  l = 3;
  a: array[1..l*2] of Byte = ($7F, $D9, $91, $AB, $6E, $CB);

var
  Form1: TForm1;

implementation

{$R *.dfm}

function CheckSumm(x: array of Byte; lx: Integer): LongWord;
var
  b: array of Word;
  i: Integer;
begin
  Result := 0;
  if Odd(lx) then Exit;
  SetLength(b, lx div 2);
  Move(x[0], b[0], lx);
  for i := 1 to (lx div 2) do
  Result := Result + swap(b[i-1]);
  SetLength(b, 0);
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  ShowMessage(IntToHex(CheckSumm(a, l * 2), 8));
end;

end.