[tor-bugs] #15190 [Tor]: Is rend-spec's 'service-authentication' a thing?

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#15190: Is rend-spec's 'service-authentication' a thing?
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 Reporter:  atagar  |          Owner:
     Type:  defect  |         Status:  new
 Priority:  normal  |      Milestone:
Component:  Tor     |        Version:
 Keywords:          |  Actual Points:
Parent ID:          |         Points:
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 Hi Nick, on #15004 I added hidden server descriptor parsing to Stem.
 donncha has been a fantastic help, providing test data and python crypto
 examples. Interestingly when we came to the rend-spec's
 [https://gitweb.torproject.org/torspec.git/tree/rend-spec.txt#n328
 service-authentication] lines he
 [https://trac.torproject.org/projects/tor/ticket/15004#comment:14 wasn't
 able to find them in the tor codebase].

 Were they never implemented? They're very strange fields, prefixing
 encrypted introduction-points with a plaintext field. Stem presently has
 (untested) support for them but if they're not actually a thing we should
 drop them from the spec.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/15190>
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