Kalium is a Java binding to Networking and Cryptography library by Daniel J. Bernstein. All the hard work of making a portable NaCl API version was done by Frank Denis on libsodium and kalium was totally inspired by Tony Arcieri's work with RbNaCl.
OS X users can get libsodium via homebrew with:
brew install libsodium
git clone https://github.com/abstractj/kalium && cd kalium mvn clean install
Add as a Maven dependency at your project:
<dependency> <groupId>org.abstractj.kalium</groupId> <artifactId>kalium</artifactId> <version>0.1.3-SNAPSHOT</version> <scope>compile</scope> </dependency>