[tor-bugs] #19872 [Core Tor/Tor]: Introduce prefixed sign/verify functions

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#19872: Introduce prefixed sign/verify functions
-------------------------------------------------+-------------------------
 Reporter:  asn                                  |          Owner:
     Type:  task                                 |         Status:  new
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.2.???
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  029-proposed, tor-hs,                |  Actual Points:
  TorCoreTeam201608                              |
Parent ID:                                       |         Points:  0.3
 Reviewer:                                       |        Sponsor:
                                                 |  SponsorR-can
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Comment (by asn):

 I have an initial branch for this at `bug19872_no_checks`. The only
 missing thing is that it has no overflow checks, so I'm not putting this
 in `needs_review` yet.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19872#comment:1>
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