static Task PlatformSetAsync(string key, string data) { var context = Platform.CurrentContext; var ks = new AndroidKeyStore(context, Alias, AlwaysUseAsymmetricKeyStorage); var encryptedData = ks.Encrypt(data); using (var prefs = context.GetSharedPreferences(Alias, FileCreationMode.Private)) using (var prefsEditor = prefs.Edit()) { var encStr = Convert.ToBase64String(encryptedData); prefsEditor.PutString(Utils.Md5Hash(key), encStr); prefsEditor.Commit(); } return(Task.CompletedTask); }