Important: this service has kalium as a dependency, which itself needs libsodium installed directly in the operating system for this to work. For more on this please read the Kalium documentation.
Just instantiate EncryptionUtils, manually or through DI, and look at the available methods and documentation.
This library was initially created to add this functionality to the Play Framework, which, i think after version 2.5, decided that this kind of functionality shouldn't be provided by the framework.