[tor-bugs] #10782 [Pluggable transport]: Improve the spec of UniformDH

["Tor Bug Tracker & Wiki" <blackhole@xxxxxxxxxxxxxx>]

#10782: Improve the spec of UniformDH
---------------------------------+---------------------
 Reporter:  asn                  |          Owner:  asn
     Type:  task                 |         Status:  new
 Priority:  normal               |      Milestone:
Component:  Pluggable transport  |        Version:
 Keywords:                       |  Actual Points:
Parent ID:                       |         Points:
---------------------------------+---------------------
 UniformDH is used by obfs3 and scramblesuit currently, and it might get
 used by more projects in the future. Yawning suggested to improve its spec
 to make its adoption easier.

 Yawning suggested adding test vectors. We can look at test vectors of
 other key exchange protocols to see how they should look like. Example:
 https://tools.ietf.org/html/rfc6932#appendix-A.1

 Some more suggestions:
 {{{
 14:54 < Yawning> *looks at the list of gotchas*
 14:54 < Yawning> spec should clarify that 0s are inserted if the public
 key is shorter than 1536 bits (probably obvious)
 14:55 < Yawning> Should clarify that abs(p - X) is sent (99% sure that's
 what happens)
 14:55 < Yawning> spec says to simply raise the public key, when it's
 another mod exp operation
 14:56 < Yawning> apart from "wtb test vectors" those where the things i
 found
 15:00 < Yawning> I also was sort of sad that MAX_PADDING isn't a power of
 2, but probably too late to change that and that might have been
 deliberate
 }}}

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/10782>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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