private void CheckUsingServerManagedPolicy()
{
//("MainActivity.CheckUsingServerManagedPolicy");
byte[] salt = new byte[15]
{
46,
65,
30,
128,
103,
57,
74,
64,
51,
88,
95,
45,
77,
117,
36
};
string packageName = this.PackageName;
string @string = Settings.Secure.GetString(this.ContentResolver, "android_id");
AESObfuscator obfuscator = new AESObfuscator(salt, packageName, @string);
ServerManagedPolicy policy = new ServerManagedPolicy(this, obfuscator);
this._licenseChecker = new LicenseChecker(this, policy, "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAry4fecehDpCohQk4XhiIZX9ylIGUThWZxfN9qwvQyTh53hvnpQl/lCrjfflKoPz6gz5jJn6JI1PTnoBy/iXVx1+kbO99qBgJE2V8PS5pq+Usbeqqmqqzx4lEzhiYQ2um92v4qkldNYZFwbTODYPIMbSbaLm7eK9ZyemaRbg9ssAl4QYs0EVxzDK1DjuXilRk28WxiK3lNJTz4cT38bfs4q6Zvuk1vWUvnMqcxiugox6c/9j4zZS5C4+k+WY6mHjUMuwssjCY3G+aImWDSwnU3w9G41q8EoPvJ1049PIi7GJXErusTYZITmqfonyejmSFLPt8LHtux9AmJgFSrC3UhwIDAQAB");
this._licenseChecker.CheckAccess(this);
}
private static AESObfuscator getObfuscator(Context context, byte[] salt)
{
if (_obfuscator == null)
{
string installationId = Installation.id(context);
string deviceId = Settings.Secure.GetString(context.ContentResolver, Settings.Secure.AndroidId);
string password = installationId + deviceId + context.PackageName;
_obfuscator = new AESObfuscator(salt, password);
}
return(_obfuscator);
}
public static string unobfuscate(Context context, byte[] salt, string obfuscated)
{
AESObfuscator obfuscator = getObfuscator(context, salt);
try
{
return(obfuscator.unobfuscate(obfuscated));
}
catch (Exception e)
{
Log.Warn(TAG, "Invalid obfuscated data or key");
}
return(null);
}
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
RequestWindowFeature(WindowFeatures.IndeterminateProgress);
SetContentView(Resource.Layout.Main);
// Try to use more data here. ANDROID_ID is a single point of attack.
string deviceId = Settings.Secure.GetString(ContentResolver, Settings.Secure.AndroidId);
// Construct the LicenseChecker with a policy.
var obfuscator = new AESObfuscator(Salt, PackageName, deviceId);
var policy = new ServerManagedPolicy(this, obfuscator);
checker = new LicenseChecker(this, policy, Base64PublicKey);
checkLicenseButton = FindViewById <Button>(Resource.Id.checkButton);
checkLicenseButton.Click += delegate { DoCheck(); };
DoCheck();
}
private void CheckLVL()
{
var salt = new byte[] { 28, 65, 30, 128, 103, 87, 74, 64, 51, 88, 95, 45, 91, 121, 36 };
// create a app-unique identifer to prevent other apps from decrypting the responses
var deviceInfoHelper = DependencyService.Resolve <IDeviceInfoHelper>();
deviceInfoHelper.AppPackageName = this.PackageName;
deviceInfoHelper.DeviceId = Android.Provider.Settings.Secure.GetString(ContentResolver, Android.Provider.Settings.Secure.AndroidId);
deviceInfoHelper.AppVersionName = this.ApplicationContext.PackageManager.GetPackageInfo(PackageName, 0).VersionName;
// create the obfuscator that will read and write the saved responses,
// passing the salt, the package name and the device identifier
var obfuscator = new AESObfuscator(salt, deviceInfoHelper.AppPackageName, deviceInfoHelper.DeviceId);
// create the policy, passing a Context and the obfuscator
var policy = new ServerManagedPolicy(this, obfuscator);
// create the checker
var checker = new LicenseChecker(this, policy, ApiKey);
// start the actual check, passing the callback
checker.CheckAccess(this);
}
public static string obfuscate(Context context, byte[] salt, string original)
{
AESObfuscator obfuscator = getObfuscator(context, salt);
return(obfuscator.obfuscate(original));
}
