[tor-bugs] #28142 [Core Tor/Tor]: Merge original WTF-PAD branch

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#28142: Merge original WTF-PAD branch
-------------------------------------------------+-------------------------
 Reporter:  asn                                  |          Owner:
                                                 |  mikeperry
     Type:  enhancement                          |         Status:
                                                 |  needs_review
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.4.0.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  wtf-pad, tor-relay, tor-cell,        |  Actual Points:
  padding                                        |
Parent ID:  #28631                               |         Points:
 Reviewer:  asn                                  |        Sponsor:
                                                 |  Sponsor2
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Comment (by asn):

 OK, the current state of things can be found here:
 https://github.com/torproject/tor/pull/547

 It's basically the `PR#461` branch, rebased to latest master, plus
 Riastradh's probability distribution work, plus the other tests I wrote.

 Here are the remaining tasks that we should address to close this:

 - Continue hammering at the unittests to increase coverage and confidence.
 My next targets are:
 {{{
   - Test histogram spacing for larger length histograms
   - Test all types of token removal
 }}}

 - Go through the remaining GH review comments.

 - Disable the current machine so that we don't merge it as on-by-default.

 After this we can give it back to Nick for another round of review.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28142#comment:14>
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