[tor-bugs] #21750 [Core Tor/Tor]: prop224: ntor handshake implementation

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#21750: prop224: ntor handshake implementation
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     Reporter:  dgoulet        |      Owner:  asn
         Type:  task           |     Status:  new
     Priority:  Medium         |  Milestone:  Tor: 0.3.1.x-final
    Component:  Core Tor/Tor   |    Version:
     Severity:  Normal         |   Keywords:  tor-hs, prop224
Actual Points:                 |  Parent ID:  #20657
       Points:  6              |   Reviewer:
      Sponsor:  SponsorR-must  |
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 Ticket created after
 https://trac.torproject.org/projects/tor/ticket/20657#comment:12

 Initial reviews are here: https://gitlab.com/asn/tor/merge_requests/13

 OK after a review from David and some comments from Nick I present the
 `prop224-ntor-v2` branch which comes with all the code review fixes, and
 with a full on integration test suite similar to the
 `./src/test/test_ntor.sh` tests for simple ntor.

 It also implements the key expansion functionality as requested by David.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21750>
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