Currently since the hash/keyCompare/keyClone members on the
context->cache were never being set, we were using the
HashTable_Pointer* variants, meaning that lookup always
failed (since we never ask for the same *pointer* twice).
This also revealed that the logic for autoallocate on these ops
was a bit backwards, and some error codes and support for the
"freshness" counter were missing.
In Win10 (at least with some card minidrivers) the freshness
counter is load-bearing and smartcard login won't work without
implementing a very basic version of it.
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