Found with git bisect, so I haven't looked into why this is the case.
However, Author: tsitkova <tsitkova@dc483132-0cff-0310-8789-dd5450dbe970>
Date:   Fri Sep 18 19:10:48 2009 +0000

    Use enc_provider for des hash routines. Also needed by Crypto modularity pro
j.                                                                             


Breaks zephyr.
After this commit, subscribing gets a srvnak.