[tor-bugs] #31369 [Core Tor/Stem]: HSv3 descriptor support in stem

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#31369: HSv3 descriptor support in stem
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 Reporter:  asn                          |          Owner:  atagar
     Type:  defect                       |         Status:  reopened
 Priority:  Medium                       |      Milestone:
Component:  Core Tor/Stem                |        Version:
 Severity:  Normal                       |     Resolution:
 Keywords:  tor-hs onionbalance scaling  |  Actual Points:
Parent ID:  #26768                       |         Points:  9
 Reviewer:                               |        Sponsor:  Sponsor27-must
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Comment (by asn):

 Hello atagar again,

 here is another post but this time about '''descriptor encoding'''. I
 started looking at how to encode an HSv3 descriptor which involves putting
 valid (and user-defined) values in the right fields plus encrypting and
 signing the descriptor.

 It's a pretty big job and I started by doing ed25519 certificate encoding
 which is certainly needed for this. I had a bit of trouble adapting the
 certificate.py code to do encoding, since it seems like the
 `Ed25519CertificateV1` class has been made with parsing in mind, but in
 this case I will need to provide its raw attributes (keys, etc.) and have
 it encode them into an actual certificate. How would you do that in terms
 of changing the class logic?

 I took a stab at it here: https://github.com/torproject/stem/pull/21 (see
 last commit).
 The whole thing works pretty well (see the unittest) but it's very dirty
 because I made my own class (for encoding) and use the old class for
 decoding. We need to unify these two classes but I would need your advice
 as the stem architect here.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31369#comment:12>
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