[tor-bugs] #20991 [Core Tor/Tor]: hs: Move sig_len field of ESTABLISH_INTRO v3 cell after sig

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#20991: hs: Move sig_len field of ESTABLISH_INTRO v3 cell after sig
-------------------------------+--------------------------------
     Reporter:  dgoulet        |      Owner:
         Type:  defect         |     Status:  new
     Priority:  Medium         |  Milestone:  Tor: 0.3.0.x-final
    Component:  Core Tor/Tor   |    Version:
     Severity:  Normal         |   Keywords:  tor-hs, prop224
Actual Points:                 |  Parent ID:  #17241
       Points:                 |   Reviewer:
      Sponsor:  SponsorR-must  |
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 There's a spec bug that we need to fix, which goes along with a
 corresponding trunnel bug: The @ptr end_sig_fields marker in
 hs_cell_establish_intro needs to be before sig_len. Otherwise we can't
 handle future signature schemes where sig_len is not determined until the
 signature is generated.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20991>
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