encryption library

I'm trying to implement encryption as described here: https://www.b4x.com/b4j/help/encryption.html There is no "Encryption" library for me to include in the Libraries Manager. I"ve tried reinstalling B4J and still no joy. Is there something I need to download to use this encryption library?

I'm creating a UI b4j program and find that while iterating the filesystem and stuffing a database (9 fields) all works fine. However, when I use the MD5 feature of the encryption v1.1 library (I am getting a checksum of the files themselves) memory quickly rises out of the heap space (>8GB...