function ByteArraysEqual(const B1, B2: array of Byte): Boolean;
var
  I: Integer;
begin
  Result := Length(B1) = Length(B2);
  if Result then
  begin
    for I := 0 to High(B1) do
    begin
      if B1[I] <> B2[I] then
      begin
        Result := False;
        Exit;
      end;
    end;
  end;
end;
//delphi/2156