Evan Hunt 6105a7d360 convert TSIG keyring storage from RBT to hash table ...

since it is not necessary to find partial matches when looking
up names in a TSIG keyring, we can use a hash table instead of
an RBT to store them.

the tsigkey object now stores the key name as a dns_fixedname
rather than allocating memory for it.

the `name` parameter to dns_tsigkeyring_add() has been removed;
it was unneeded since the tsigkey object already contains a copy
of the name.

the opportunistic cleanup_ring() function has been removed;
it was only slowing down lookups.

2023-06-14 08:14:38 +00:00

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