[tor-bugs] #31777 [Core Tor/Stem]: Key blinding in onionbalance v3

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#31777: Key blinding in onionbalance v3
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     Reporter:  asn      |      Owner:  atagar
         Type:  defect   |     Status:  new
     Priority:  Medium   |  Milestone:
    Component:  Core     |    Version:
  Tor/Stem               |   Keywords:  tor-hs scaling onionbalance
     Severity:  Normal   |  network-team-roadmap-september tor-spec
Actual Points:           |  Parent ID:  #26768
       Points:  2        |   Reviewer:
      Sponsor:           |
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 Need to implement key blinding for v3 onions in onionbalance (or stem).

 There are already some tests in little-t-tor about it but they seem to be
 using a custom ed25519 implementation, whereas stem is using hazmat:
 https://gitweb.torproject.org/tor.git/tree/src/test/ed25519_exts_ref.py#n34

 Need to decide whether I should do the same for hazmat, or adopt the
 custom ed25519 implementation. Most probably the former.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31777>
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