private static string EncryptKeyFull()
{
string keyDemo = GetKeyValue(path, name);
if (keyDemo == null)
{
}
Encoding ascii = Encoding.ASCII;
int nr;
// Bejme kriptimin e kohes kur eshte ngarkuar sistemi
string loadedSystemTime = keyDemo.Substring(keyDemo.Length - 4, 4);
Byte[] systemTime = ascii.GetBytes(loadedSystemTime);
string encodedSystemTime = "";
foreach (Byte b in systemTime)
{
nr = Algebra.GetIndex(Convert.ToChar(b));
// Bejme kete veprim: ((nr + 15) * 3) - 8
nr = Algebra.Substract(Algebra.Multiply(Algebra.Sum(nr, 15, 59), 3, 59), 6, 59);
encodedSystemTime += Algebra.GetChar(nr).ToString();
}
// Bejme kriptimin e numrit serial te Windows-it
string systemSerial = keyDemo.Substring(0, 8);
Byte[] encodedSystemSerial = ascii.GetBytes(systemSerial);
string systemSerialEnc = "";
foreach (Byte b in encodedSystemSerial)
{
nr = Algebra.GetIndex(Convert.ToChar(b));
// Bejme kete veprim: ((nr - 2) * 10) + 7
nr = Algebra.Sum(Algebra.Multiply(Algebra.Substract(nr, 2, 59), 10, 59), 7, 59);
systemSerialEnc += Algebra.GetChar(nr);
}
// Bejme kriptimin e ID-se se hardDiskut
string hardDisk = keyDemo.Substring(8, 8);
Byte[] encodedHardDiskID = ascii.GetBytes(hardDisk);
string hardDiskIDEnc = "";
int i = 0;
foreach (Byte b in encodedHardDiskID)
{
nr = Algebra.GetIndex(Convert.ToChar(b));
// Bejme kete veprim: ((nr + 6) * 7) + ((i * 3) + 3)
nr = Algebra.Sum(Algebra.Multiply(Algebra.Sum(nr, 6, 59), 7, 59),
Algebra.Sum(Algebra.Multiply(i, 3, 59), 3, 59), 59);
hardDiskIDEnc += Algebra.GetChar(nr);
i++;
}
// Ne kete pike vendosim te gjitha vlerat e nxjerra nga kriptimi, bashke
return(systemSerialEnc + hardDiskIDEnc + encodedSystemTime);
}
/// <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("");
}
}
