[tor-bugs] #20852 [Core Tor/Tor]: prop224: Update HSDir prop224 code based on newest descriptor changes

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#20852: prop224: Update HSDir prop224 code based on newest descriptor changes
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 Reporter:  asn                                  |          Owner:  asn
     Type:  defect                               |         Status:
                                                 |  assigned
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.3.0.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tor-hs, prop224,  TorCoreTeam201612  |  Actual Points:
Parent ID:                                       |         Points:  3
 Reviewer:                                       |        Sponsor:
                                                 |  SponsorR-can
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Comment (by asn):

 OK, I did some preliminary investigation for this ticket. IMO, there are
 two steps here:

 == a) Fix the HSDir code to conform to prop224 ==

 Only fixing the HSDir part here is the minimum viable product for 0.3.0,
 so that the network is prepared. It will basically make HSDirs understand
 the newest prop224 format (with `superencrypted` etc.). Since this is
 HSDir-only, we don't need to implement the whole client-auth logic; we
 just need to be able to parse the plaintext part of the descriptor.

 == b) Fix the rest of the descriptor code to conform to prop224 ==

 This part would involve actually implementing the client-auth parts of the
 descriptor, and making clients and hidden services actually be able to
 parse those. IMO, this is a much bigger project than the above, and it's
 not strictly required for 0.3.0 since it belongs to the client/HS code.

 ----

 My plan is to finish (a) ASAP, and then only do (b) if there is enough
 time.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20852#comment:2>
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