Xamarin.Essentials Secure Storage
The SecureStorage class helps securely store simple key/value pairs.
To access the SecureStorage functionality, the following platform-specific setup is required:
Using Secure Storage
Add a reference to Xamarin.Essentials in your class:
To save a value for a given key in secure storage:
await SecureStorage.SetAsync("oauth_token", "secret-oauth-token-value");
To retrieve a value from secure storage:
var oauthToken = await SecureStorage.GetAsync("oauth_token");
Platform Implementation Specifics
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 [YOUR-APP-PACKAGE-ID].xamarinessentials. The key used in the shared preferences file is a MD5 Hash of the key passed into the
API Level 23 and Higher
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.
API Level 22 and Lower
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.
All encrypted values will be removed when the app is uninstalled from the device.
This API is intended to store small amounts of text. Performance may be slow if you try to use it to store large amounts of text.