private static int DecryptRoomsCountFull()
{
try
{
string lengthString = GetKeyValue("Vlera2");
string keyFull = GetKeyValue(path, name);
int length = Convert.ToInt32(lengthString);
Encoding ascii = Encoding.ASCII;
int nr;
// Bejme deshifrimin e numrit te dhomave qe jane ne program
string nrDhomash = keyFull.Substring(keyFull.Length - length, length);
string nrDhomashDec = "";
Byte[] encodedRoomCount = ascii.GetBytes(nrDhomash);
foreach (Byte b in encodedRoomCount)
{
nr = Algebra.GetIndex(Convert.ToChar(b));
// Bejme kete veprim: ((nr + 6) / 8) - 9
nr = Algebra.Substract(Algebra.Divide(Algebra.Sum(nr, 6, 59), 8, 59), 9, 59);
nrDhomashDec += Algebra.GetChar(nr).ToString();
}
return(Convert.ToInt32(nrDhomashDec));
}
catch
{
return(0);
}
}
/// <summary>
/// Ben deshifrimin e numrit serial qe eshte i ruajtur ne rregjistra nga versioni i plote ne
/// versionin DEMO
/// </summary>
/// <returns>numrin serial te deshifruar</returns>
private static string DecryptKeyFull(string encrypted)
{
try
{
string keyFull = GetKeyValue(path, name);
if (keyFull == null || keyFull == "")
{
StoreKeyToRegistry(name, encrypted);
keyFull = encrypted;
}
Encoding ascii = Encoding.ASCII;
int nr;
// Bejme deshifrimin e kohes se ngarkimit te sistemit
string loadedSystemTime = keyFull.Substring(keyFull.Length - 4, 4);
string systemTimeDec = "";
Byte[] systemTime = ascii.GetBytes(loadedSystemTime);
foreach (Byte b in systemTime)
{
nr = Algebra.GetIndex(Convert.ToChar(b));
// Bejme kete veprim: ((nr + 8) / 3) - 15
nr = Algebra.Substract(Algebra.Divide(Algebra.Sum(nr, 6, 59), 3, 59), 15, 59);
systemTimeDec += Algebra.GetChar(nr).ToString();
}
// Bejme deshifrimin e numrit serial te sistemit
string systemSerial = keyFull.Substring(0, 8);
string systemSerialDec = "";
Byte[] encodedSystemSerial = ascii.GetBytes(systemSerial);
foreach (Byte b in encodedSystemSerial)
{
nr = Algebra.GetIndex(Convert.ToChar(b));
// Bejme kete veprim: ((nr - 7) / 10) + 2
nr = Algebra.Sum(Algebra.Divide(Algebra.Substract(nr, 7, 59), 10, 59), 2, 59);
systemSerialDec += Algebra.GetChar(nr).ToString();
}
// Bejme deshifrimin e numrit serial te hard diskut
string hardDiskSerial = keyFull.Substring(8, 8);
string hardDiskSerialDec = "";
Byte[] encodedHDSerial = ascii.GetBytes(hardDiskSerial);
int i = 0;
foreach (Byte b in encodedHDSerial)
{
nr = Algebra.GetIndex(Convert.ToChar(b));
// Bejme kete veprim: ((nr - ((i * 3) + 3) / 7) - 6
nr = Algebra.Substract(Algebra.Divide(Algebra.Substract(nr,
Algebra.Sum(Algebra.Multiply(i, 3, 59), 3, 59), 59), 7, 59), 6, 59);
hardDiskSerialDec += Algebra.GetChar(nr).ToString();
i++;
}
// Tani bashkojme vlerat e gjetura nga deshifrimet e mesiperme dhe e kthejme kete vlere
return(systemSerialDec + hardDiskSerialDec + systemTimeDec);
}
catch (Exception ex)
{
return("");
}
}
