[tor-bugs] #3122 [Tor Client]: Write and use constant-time comparison functions

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#3122: Write and use constant-time comparison functions
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 Reporter:  rransom      |          Owner:  ioerror           
     Type:  enhancement  |         Status:  needs_review      
 Priority:  major        |      Milestone:  Tor: 0.2.1.x-final
Component:  Tor Client   |        Version:                    
 Keywords:               |         Parent:                    
   Points:               |   Actualpoints:                    
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Comment(by nickm):

 I'm not distinguishing fast_memcmp from fast_memneq in this round of
 changes, since they're the same function under the covers.  I created
 fast_memeq and fast_memneq mainly so we could transition between tor_* and
 fast_* without worrying about messing up when adding and removing ! s.

 Fixing the docs is important though.

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/3122#comment:24>
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