Yawning Angel authored Jun 14, 2016 and Nick Mathewson committed Jun 14, 2016

There's accessors to get at things, but it ends up being rather
cumbersome.  The only place where behavior should change is that the
code will fail instead of attempting to generate a new DH key if our
internal sanity check fails.

Like the previous commit, this probably breaks snapshots prior to pre5.