This plugin provides a pure Java implementation for generating argon2id password digests in FusionAuth.
To install Java, you will need the OpenJDK. Due to licensing, you can't simply use the Oracle JDK distribution due to 'commercial use'.
Hop over to Adoptium to download the OpenJDK for your platform.
This project uses Maven, so to build the required JAR file, you need to run:
$ mvn package
This will spit out a "shaded" uber JAR, that is a JAR file packaged with all required dependencies packed into a single JAR file.
The required JAR file need to be sent on to the FusionAuth's support team via email or via a support ticket, so they can plug it directly into the specific cloud deployment.
Take the shaded JAR and copy/paste/add it into FusionAuth's plugin
folder.