[tor-bugs] #20742 [- Select a component]: prop224: Implement stealth client authorization

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#20742: prop224: Implement stealth client authorization
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     Reporter:  asn                   |      Owner:
         Type:  task                  |     Status:  new
     Priority:  Medium                |  Milestone:
    Component:  - Select a component  |    Version:
     Severity:  Normal                |   Keywords:  prop224, prop224
Actual Points:                        |  Parent ID:  #20700
       Points:  3                     |   Reviewer:
      Sponsor:  SponsorR-can          |
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 prop224 currently does not specify stealth client authorization.

 This is a feature from `rend-spec.txt` which makes the HS create a unique
 onion address for each authorized client. This way revoked clients cannot
 get presense information about the hidden service, since they don't know
 the onion addresses of other clients.

 This is useful for cases where authorized clients have a chance of turning
 adversarial and there is a need for total revocation.

 tl;dr: We need to specify stealth auth in prop224, and implement it.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20742>
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