private string GetProductKey(string code)
{
string temp;
StringBuilder key;
int tCount;
key = new StringBuilder();
code = code.Replace("-", "");
temp = AESEncryption.Encrypt(code, ENCRYPTION_KEY);
tCount = 0;
for (int i = 0; i < temp.Length; i++)
{
if (Char.IsLetterOrDigit(temp[i]))
{
key.Append(temp[i].ToString().ToUpper());
tCount++;
if (tCount >= 4)
{
key.Append("-");
tCount = 0;
}
if (key.Length >= 20) // 4 block of 4 character
{
break;
}
}
}
return(key.ToString().Substring(0, 19));
}
private string GetActivationCode()
{
string cpuInfo = string.Empty;
StringBuilder code = new StringBuilder();
int tCount;
ManagementClass mc = new ManagementClass("win32_processor");
ManagementObjectCollection moc = mc.GetInstances();
foreach (ManagementObject mo in moc)
{
if (cpuInfo == "")
{
//Get only the first CPU's ID
cpuInfo = mo.Properties["ProcessorID"].Value.ToString();
break;
}
}
cpuInfo = AESEncryption.Encrypt(cpuInfo, ENCRYPTION_KEY);
tCount = 0;
for (int i = 0; i < cpuInfo.Length; i++)
{
if (Char.IsLetterOrDigit(cpuInfo[i]))
{
code.Append(cpuInfo[i].ToString().ToUpper());
tCount++;
if (tCount >= 4)
{
code.Append("-");
tCount = 0;
}
if (code.Length >= 20) // 4 block of 4 character
{
break;
}
}
}
return(code.ToString().Substring(0, 19));
}
public bool CheckProductKey()
{
RegistryKey savedKey;
string productKey;
string encryptedKey;
DateTime insDate;
DateTime lwkDate;
try
{
savedKey = Registry.LocalMachine.CreateSubKey(PRODUCT_REGISTRY_KEY);
if (savedKey != null)
{
if (savedKey.GetValue(PRODUCT_KEY_NAME) != null)
{
productKey = savedKey.GetValue(PRODUCT_KEY_NAME).ToString();
savedKey.Close();
if (productKey != "")
{
if (activationCode == "")
{
activationCode = GetActivationCode();
}
encryptedKey = GetProductKey(activationCode);
if (encryptedKey.Contains(productKey))
{
if (encryptedKey.Length == productKey.Length)
{
return(true);
}
}
}
}
// product key is not exist or not valid
// check for trial period
if ((savedKey.GetValue(INSTALLATION_DATE_KEY_NAME) == null) || (savedKey.GetValue(LAST_WORKING_DATE_KEY_NAME) == null))
{
// create 2 new sub key for installation date & last working day
if (savedKey.GetValue(INSTALLATION_DATE_KEY_NAME) == null)
{
savedKey.SetValue(INSTALLATION_DATE_KEY_NAME, AESEncryption.Encrypt(DateTime.Now.ToString(), ENCRYPTION_KEY));
}
savedKey.SetValue(LAST_WORKING_DATE_KEY_NAME, AESEncryption.Encrypt(DateTime.Now.ToString(), ENCRYPTION_KEY));
}
else
{
insDate = DateTime.Parse(AESEncryption.Decrypt(savedKey.GetValue(INSTALLATION_DATE_KEY_NAME).ToString(), ENCRYPTION_KEY));
lwkDate = DateTime.Parse(AESEncryption.Decrypt(savedKey.GetValue(LAST_WORKING_DATE_KEY_NAME).ToString(), ENCRYPTION_KEY));
if ((DateTime.Now.CompareTo(lwkDate) < 0) || (lwkDate.Subtract(insDate).TotalDays > TRIAL_PERIOD))
{
// trial period is over --> show the registration form
this.ShowDialog();
return(isRegistered);
}
savedKey.SetValue(LAST_WORKING_DATE_KEY_NAME, AESEncryption.Encrypt(DateTime.Now.ToString(), ENCRYPTION_KEY));
}
}
else
{
// cannot create product key in registry
MessageBox.Show("Cannot create product key entry. The program will now abort!");
Environment.Exit(0);
}
}
catch (Exception ex)
{
// problem occurred when checking product license
Console.WriteLine(ex);
MessageBox.Show("Problem occurred while checking for product license. The program will now abort!");
Environment.Exit(0);
}
return(false);
}