[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:                                       |         Points:
 Reviewer:  asn                                  |        Sponsor:
                                                 |  Sponsor2
-------------------------------------------------+-------------------------

Comment (by riastradh):

 FYI: a part of this work, namely the uniform ^^[0,1^^] sampler used
 throughout, is echoed in #23061.  Just letting you know in case you want
 to avoid the duplication sooner rather than later.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28142#comment:11>
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