/// <summary>
/// Generates a valid ProductKey.
/// </summary>
/// <remarks>
///A valid key should contain 18 digits in 5 parts:
///a: 1 random value & odd means isTrial=true, even means isTrail=false.
///b: 2~8 machine key
///c: 9~13 left days
///d: 14~17 version
///e: 18 checksum
///</remarks>
public static ProductKey Create(MachineKey machineKey, DateTime expireDate, Version version, bool isTrial)
{
if (!machineKey.IsValid || (expireDate - _baseDate).Days > 99999)
{
return(null);
}
int a = _random.Next(1, 10); //[1, 9]
if ((isTrial && a % 2 == 0) || (!isTrial && a % 2 == 1))
{
a++;
}
int b = int.Parse(machineKey.Key.Substring(0, 7));
int c = expireDate > _baseDate ? (expireDate - _baseDate).Days : 0;
string abcd = a.ToString() + machineKey.Key.Substring(0, 7) + c.ToString().PadLeft(5, '0') + version.GetNumber().ToString().PadLeft(4, '0');
string e = Utility.GetNumericHash(abcd, 1);
string result = abcd + e;
return(new ProductKey(Encode(result)));
}
public override License GetLicense(LicenseContext context, Type type, object instance, bool allowExceptions)
{
//#if DEBUG
// return new MyLicense(this, "Developer", DateTime.Now.AddMonths(1), false);
//#endif
var machineKey = MachineKey.Create();
if (context != null && context.UsageMode == LicenseUsageMode.Designtime)
{
var productKey = ProductKey.Create(machineKey, DateTime.Now.AddDays(30), Version.GetDefault(), true);
return(new MyLicense(this, productKey));
}
else
{
ProductKey productKey;
RegistryKey rk = Registry.CurrentUser.CreateSubKey("SOFTWARE\\CP_NLayer");
string keyName = "pk"; //product key
var keyValue = rk.GetValue(keyName) as string;
if (keyValue == null)
{
// first run
productKey = ProductKey.Create(machineKey, DateTime.Now.AddDays(30), Version.GetDefault(), true);
rk.SetValue(keyName, productKey.Key);
}
else
{
productKey = new ProductKey(keyValue);
if (!productKey.IsValid || productKey.MachineKey.Key != machineKey.Key)
{
productKey = null;
}
}
return(new MyLicense(this, productKey));
}
}
