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

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#31369: HSv3 descriptor support in stem
-----------------------------------------+-------------------------------
 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:                               |         Points:
 Reviewer:                               |        Sponsor:  Sponsor27-can
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Comment (by teor):

 asn / atagar,

 I'm happy to answer questions about certificate validation.

 Here's what we have already:

 Ed25519 certificate validation in stem's certificate.py.
 Here's how to validate a signed hash using python's cryptography module:
 https://gitweb.torproject.org/stem.git/tree/stem/descriptor/certificate.py#n256

 Ed25519 key blinding in tor's unit tests.
 Here's how we blind a key:
 https://gitweb.torproject.org/tor.git/tree/src/test/ed25519_exts_ref.py#n34
 We might be able to rewrite that code better if we have access to some low
 level functions in python cryptography.

 There are also some other useful tor unit tests in python:

 HSv3 hash ring indexes:
 https://gitweb.torproject.org/tor.git/tree/src/test/hs_indexes.py

 HSv3 addresses:
 https://gitweb.torproject.org/tor.git/tree/src/test/hs_build_address.py

 Maybe the HSv3 ntor or plain ntor implementations could also help:
 https://gitweb.torproject.org/tor.git/tree/src/test/hs_ntor_ref.py
 https://gitweb.torproject.org/tor.git/tree/src/test/ntor_ref.py
 ntor uses curve25519.

 Let me know what you're missing, and I'll do my best to help.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31369#comment:6>
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