[tor-bugs] #13696 [Tor]: Use syscall-based entropy reading where possible.

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#13696: Use syscall-based entropy reading where possible.
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 Reporter:  nickm        |          Owner:  yawning
     Type:  enhancement  |         Status:  needs_revision
 Priority:  Medium       |      Milestone:  Tor: 0.2.???
Component:  Tor          |        Version:
 Severity:  Normal       |     Resolution:
 Keywords:  tor-relay    |  Actual Points:
Parent ID:               |         Points:
  Sponsor:               |
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Comment (by nickm):

 On top of Yawning's branch would be fine.

 Another thought: we really don't need this code to be fast.  Maybe instead
 of trying syscall, and then device if syscall fails, we should try both
 and hash them together?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/13696#comment:8>
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