Is Java Cryptography Standard Libraries In Android Run As Native Code

I am integrating standard java cryptography classes in my Android application, but I noticed that the AES algorithm is not that fast, it cannot encrypt more than about 5 Kb per sec

Solution 1:

Is Java Cryptography standard libraries in Android run as native code

On older devices, javax.crypto is implemented in Java code. Starting in Android 4.3 or 4.4, Android uses an OpenSSL-based javax.crypto provider, so most of the code will be native.

so do someone know if I can get more performance if I implement my own cryptography methods using NDK?

If by "implement my own cryptography methods", you mean "link to and use libcrypto", that may be faster on older devices, but I would not expect much difference on newer devices.