When using PKINIT with DH, compute session key
When using PKINIT with DH, compute session key

RFC6112 provides a method of computing a session key when the PKINIT DH
is used, and mandates it for anonymous pkinit. The session key is computed
using KRB-FX-CF2 from the reply key and a random key chosen by the kdc.
The random key is provided to the client, which is supposed to verify
that the session key was computed this way.

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