With Virgo Jetty Server installed you have everything available to create passwords for the embedded Jetty:// server.
$ java -cp $(VIRGO_HOME)/repository/ext/jetty-util-8.1.3.v20120416.jar org.eclipse.jetty.util.security.Password admin admin
admin
OBF:1u2a1toa1w8v1tok1u30
MD5:21232f297a57a5a743894a0e4a801fc3
CRYPT:adpexzg3FUZAk
Now you can pick whatever security level you want...
More details can be found here
The prefix OBF:, MD5: or CRYPT: is mandatory.