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o Major bug fixes (circuit building):
- Tor authorities, relays, and clients only use ntor, except for
rare cases in the hidden service protocol.
- Authorities, relays and clients specifically check that each
descriptor has an ntor key.
- Clients avoid downloading a descriptor if the relay version is
too old to support ntor.
- Client code never chooses nodes without ntor keys: they will not
be selected during circuit-building, or as guards, or as directory
mirrors, or as introduction or rendezvous points.
- Circuit-building code assumes that all hops can use ntor,
except for rare hidden service protocol cases.
- Hidden service client to intro point and service to rendezvous point
connections use the TAP key supplied by the protocol.
Fixes bug 19163; bugfix on 0.2.4.18-rc.
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