Gwenhywfar

Fixed a bug in crypto stuff.

Previously when detecting a weak key while generating a random key Gwen
aborted due to an error result from libgcrypt.

Now we simply generate a new key.

git-svn-id: https://devel.aqbanking.de/svn/gwenhywfar/trunk@1947 70169cfe-8b10-0410-8925-dcb4b91034d8