In the `JCA` and `BouncyCalste-JCA` **`KeyStore.crysl`** we currently only permit the values `"jceks", "jks", "dks", "pkcs11", "pkcs12"`. However as [`androidx.security.crypto.MasterKeys.java`](https://android.googlesource.com/platform/frameworks/support/+/refs/heads/androidx-master-dev/security/crypto/src/main/java/androidx/security/crypto/MasterKeys.java) suggests in Android Apps it's totally OK, if even not preferred to use the value `AndroidKeyStore`.