JAX-WS is a standardized API. The JDK comes with a reference implementation. I'm not sure if the reference implementation supports digest Jboss includes its own implementation and overrides what's included with the JDK using the endorsed libs. The mechanism of generating the client and service classes has no affect in this case. It's the runtime environment. Since you're posting on a jboss forum, I'm assuming that your targetted environment is in fact jboss.
If you ran outside of jboss, such as with the endpoint api, and didn't specify endorse libs, it would default the reference implementation in the jdk.
So you'll either have to use CXF, or just use http basic, http client cert, or use xml based authentication, such as ws-usernametoken, etc
There should be a feature request on jira about it