[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 Sebastian):

 I looked through all the different transformations of memcmp (the last two
 patches in the branch) and didn't spot anything obvious.

 Maybe we should add something (maybe to make test, or make check-spaces,
 or even something new for this purpose) that prints a warning if we're
 using memcmp anywhere in src/ other than src/common/di_ops* with the
 possible exception of unit tests? The cleanup would be easy - only two
 comments (one in dirserv.c, one in routerlist.c) remain.

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/3122#comment:25>
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