Bouncy Castle jars missing from CircleCI

Is there an easy way to have the org.bouncycastle.jcajce.JcaJceHelper class included in CircleCI? Our build does not work on CircleCI because this library seems to be missing from the environment?

Why is this? Is it to do with some kind of legal restriction with cryptography? Also, how do I get around it?

We only preinstall the most common software in order to keep the build image a sensible size.

You can download the relevant .jar file and add it to your classpath, and you should be able to use the API. You can do this from circle.yml using any normal bash commands (e.g. wget)