[tor-bugs] #32563 [Core Tor/Tor]: Merge HSv3 spec fixes we found during onionbalance creation

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#32563: Merge HSv3 spec fixes we found during onionbalance creation
-------------------------------------------------+-------------------------
 Reporter:  asn                                  |          Owner:  asn
     Type:  defect                               |         Status:
                                                 |  needs_revision
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  unspecified
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tor-hs, scaling, onionbalance,       |  Actual Points:
  network-team-roadmap-september, tor-spec,      |
  network-team-roadmap-2020Q1                    |
Parent ID:  #26768                               |         Points:  0.2
 Reviewer:  dgoulet                              |        Sponsor:
                                                 |  Sponsor27-must
-------------------------------------------------+-------------------------

Comment (by asn):

 Replying to [comment:9 dgoulet]:
 > I think we need to define the length in bytes for `mac_key_len` and
 `salt_len` ?
 >
 > Code is forcing it to 8 bytes:
 >
 > {{{
 >   crypto_digest_add_bytes(digest, (const char *) &mac_len_netorder, 8);
 >   crypto_digest_add_bytes(digest, (const char *) &salt_len_netorder, 8);
 > }}}

 Hey. Isn't `htonll` already specifying that it's a `uint64_t` and hence 8
 bytes?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/32563#comment:10>
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