Demonstration of the RSA cryptography on various versions of the Android. It covers following operations:

• Key pair generation
• Encryption
• Decryption
• Key derivation

We closed RSA 2048 because it seems to be supported on the most versions of the Android.

Android Keystore provider feature that was introduced in Android 4.3 (API level 18).

Supports other than 2048bit RSA keys in generateKeyPair().

Keystore redesign in Android M (fingerprint authorization introduced etc.)