[tor-bugs] #21403 [Core Tor/Tor]: prop224: Implementation HS directory fetching

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#21403: prop224: Implementation HS directory fetching
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     Reporter:  haxxpop        |      Owner:  haxxpop
         Type:  enhancement    |     Status:  new
     Priority:  Medium         |  Milestone:  Tor: 0.3.1.x-final
    Component:  Core Tor/Tor   |    Version:
     Severity:  Normal         |   Keywords:  tor-hs, prop224
Actual Points:                 |  Parent ID:  #17242
       Points:  parent         |   Reviewer:
      Sponsor:  SponsorR-must  |
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 Before the client actually can connect to the service, it has to fetch the
 descriptor first. As already specified in prop224 section 2.1 and 2.2.6

 The client needs to parse the service's master public key from the onion
 address, derive the blinded public key, and then use that blinded public
 key to fetch the descriptor from the HSDir.

 (Note that, this ticket doesn't implement how to pick the HSDir)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21403>
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