[tor-bugs] #31823 [Core Tor/Stem]: HSv3 descriptor support in stem [encoding]

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#31823: HSv3 descriptor support in stem [encoding]
-------------------------------------------------+-------------------------
 Reporter:  asn                                  |          Owner:  atagar
     Type:  defect                               |         Status:
                                                 |  needs_review
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  unspecified
Component:  Core Tor/Stem                        |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tor-hs scaling onionbalance          |  Actual Points:  2
  network-team-roadmap-september tor-spec        |
Parent ID:  #26768                               |         Points:  5
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------

Comment (by atagar):

 > For me, the most important part is not to change the interface

 Hi asn. Actually, adjusting the interface is
 [https://gitweb.torproject.org/user/atagar/stem.git/commit/?h=hsv3&id=a8c2a431c1c2a6f38bbf1678c05aebf0a5e217d6
 exactly what I did today] but don't worry - onionbalance can still do the
 same.

 For example, here's what a descriptor with custom introduction points and
 random key material looks like...

 {{{
 from stem.descriptor.hidden_service import (
   HiddenServiceDescriptorV3,
   InnerLayer,
   IntroductionPointV3,
 )

 print(HiddenServiceDescriptorV3.content(
   inner_layer = InnerLayer.create(
     introduction_points = [
       IntroductionPointV3.create('1.1.1.1', 9001),
       IntroductionPointV3.create('2.2.2.2', 9001),
       IntroductionPointV3.create('3.3.3.3', 9001),
     ],
   ),
 ))
 }}}

 {{{
 % python demo.py
 hs-descriptor 3
 descriptor-lifetime 180
 descriptor-signing-key-cert
 -----BEGIN ED25519 CERT-----
 AQgABqvHAX8wXzJY+FqoJQPXNZ8u+SQGPZ1WN/r3hUna0R2AXQnEAQAgBAAuqibl
 ALcKa/4nHtLZn2zKV8L4XIpkRyRm7btWPLpYN5Gseb03H5exL+I3SqfG3uNDw5QK
 CmPlCQUy3usouSwhO/qWgdy0//bP5kRDma5GDXXWoi3+xTKM6Jez7TGxPAU=
 -----END ED25519 CERT-----
 revision-counter 1573695064
 superencrypted
 -----BEGIN MESSAGE-----
 aDJodcMjhCvz1K7JCJEAH1H24hvoZ7gZw53AhPdvpHu+5d1Ogwio4qcIXEK1pEgy
 QFF1fE6tnCzsk++eMa2WaKwIJYGLPoCnta78H5Ve6VoMj+Pyb5rE6wPTMTPSVm6M
 UjllArr7DS8YcofloDxu3iwC3JZYFt/LB6ahq6lBKeot2BD/11pNggkZrZOCLgNQ
 pUVyQau7K8ynagVlNNESnI3FccOBaBB4Xa5mObK2ylyiLQ08MqaImW7X2gxeZltT
 /C/xtiJXGm2CzkjPpBpMWm09p7/a97GEWca5e8+fhpmGrN7zjAwjYInTvQHS5AyU
 7eUFg8ItrRxAiRq4fbe/zepiq2vgfj1Pt7uxC0KCTcLWpd9O/FIvcFSk27Yrtniw
 ... etc...
 -----END MESSAGE-----
 signature
 VDDXXLvgU6qjRI4zfJR3GbQuVjz98qO0LI5gsI60LtGXK2POZ4E+3YVVWuVaEkvMsZaku5qCutIcu74/WQMxCQ
 }}}

 > For the test to be proper, each introduction point should have unique
 keys

 The keys are arguments. If you want them to have unique keys we can simply
 drop them to do the same thing as your helper (I only the keys in the test
 to demonstrate how key arguments are provided).

 Pretty close to finishing this branch but not there yet. I'll let ya know
 once I'm ready for a review.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31823#comment:8>
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