Each setting can be up to 8K bytes in size and each composite setting can be up to 64K bytes in size. It also uses LocalSettings which has a restriction that the name of each setting can be 255 characters in length at most. SecureStorage uses the Preferences API and follows the same data persistence outlined in the Preferences documentation. In some cases Ke圜hain data is synchronized with iCloud, and uninstalling the application may not remove the secure values from iCloud and other devices of the user.ĭataProtectionProvider is used to encrypt values securely on UWP devices.Įncrypted values are stored in, inside a container with a name of. The SecRecord used to store the value has a Service value set to. Ke圜hain is used to store values securely on iOS devices. If a device upgrades from API level 22 or lower to API level 23 and higher, this type of encryption will continue to be used unless the app is uninstalled or RemoveAll is called. Xamarin ios simulator keeps delete my database android#On older API levels, the Android KeyStore only supports storing RSA keys, which is used with an RSA/ECB/PKCS1Padding cipher to encrypt an AES key (randomly generated at runtime) and stored in the shared preferences file under the key SecureStorageKey, if one has not already been generated. On newer API levels, an AES key is obtained from the Android KeyStore and used with an AES/GCM/NoPadding cipher to encrypt the value before it is stored in the shared preferences file. The key (not a cryptographic key, the key to the value) used in the shared preferences file is a MD5 Hash of the key passed into the SecureStorage APIs. The Android KeyStore is used to store the cipher key used to encrypt the value before it is saved into a Shared Preferences with a filename of. In the project properties, under iOS Bundle Signing set the Custom Entitlements to ist. This will automatically add the application's identifier as a group. Open the ist in the iOS project and find the Keychain entitlement and enable it. When developing on the iOS simulator, enable the Keychain entitlement and add a keychain access group for the application's bundle identifier. Then set the following content that includes all shared preferences except for SecureStorage: Set the android:fullBackupContent attribute in your AndroidManifest.xml: Ĭreate a new XML file named auto_backup_rules.xml in the Resources/xml directory with the build action of AndroidResource. You can create a custom rule set to exclude SecureStore items from being backed up. Īuto Backup can be configured to disable specific content from backing up. This approach is only recommended if you plan on restoring data in another way. You can choose to disable Auto Backup for your entire application by setting the android:allowBackup setting to false in the AndroidManifest.xml file. Xamarin.Essentials automatically handles this case by removing the key so it can be reset, but you can take an additional step by disabling Auto Backup. This can impact SecureStorage which utilizes share preferences that are backed up and can not be decrypted when the restore occurs. Data is restored when an app is re-installed or installed on a new device. Auto Backup for Apps is a feature of Android 6.0 (API level 23) and later that backs up user's app data (shared preferences, files in the app's internal storage, and other specific files).
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