[tor-bugs] #13697 [Tor]: Carry entropy across invocations

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#13697: Carry entropy across invocations
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 Reporter:  nickm           |          Owner:
     Type:  enhancement     |         Status:  new
 Priority:  normal          |      Milestone:  Tor: 0.2.6.x-final
Component:  Tor             |        Version:
 Keywords:  026-deferrable  |  Actual Points:
Parent ID:                  |         Points:
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 Wen Tor starts, after seeding the CSPRNG, we should save some of its
 output to an "entropy" file.  On later invocations, we should reseed from
 that file '''in addition to''' seeding from the OS, and then replace it
 with new CSPRNG output.

 This is silly voodoo that might help us out if we're ever in a position
 where the OS has previously been well seeded but later is not.  It can't
 make things worse, so long as RAND_add() is additive.

 It's deferrable; #13696 is more important, assuming a non-broken OS.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/13697>
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