[tor-bugs] #19649 [Core Tor/Tor]: Define a link specifier containing an ntor onion key

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#19649: Define a link specifier containing an ntor onion key
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     Reporter:  teor          |      Owner:
         Type:  enhancement   |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.2.???
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  tor-hs, 030-proposed, prop224
Actual Points:                |  Parent ID:  #17238
       Points:  3             |   Reviewer:
      Sponsor:                |
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 If we want to support intro and rend points that aren't in the consensus,
 we need to define and parse a link specifier with an ntor onion key in it.

 In order to extend via ntor to an introduction point, either:
 * the introduction point must be in the consensus, and have an ntor onion
 key in its descriptor, or
 * the HS descriptor must contain the ntor onion key for the introduction
 point

 In order to extend via ntor to a rendezvous point, either:
 * the rendezvous point must be in the consensus, and have an ntor onion
 key in its descriptor, or
 * the INTRODUCE2 cell must contain the ntor onion key for the rendezvous
 point

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19649>
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