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Subject: [Bug 222807] PURE entropy sources are harvested but not mixed in.
 Also, min-entropy low per SP800-90B measurements
Date: Fri, 06 Oct 2017 18:28:46 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D222807

--- Comment #10 from commit-hook@freebsd.org ---
A commit references this bug:

Author: cem
Date: Fri Oct  6 18:27:56 UTC 2017
New revision: 324372
URL: https://svnweb.freebsd.org/changeset/base/324372

Log:
  random(4): Discard low entropy inputs

  The later fields of the harvest_event structure are predictable and provi=
de
  little value to the entropy pool.  Only feed in the relatively high entro=
py
  counter and explicit entropy buffer to increase measured input entropy.

  See also:
  https://people.freebsd.org/~jmg/vbsdcon_2017_ddfreebsdrng_slides.pdf

  PR:           222807
  Submitted by: W. Dean Freeman <badfilemagic AT gmail.com>
  Reviewed by:  jmg (earlier version), delphij
  Approved by:  secteam (delphij)
  Obtained from:        HBSD 8d809124d563937edd84c9c9d5494406e359c55c
  Security:     no -- low entropy marginal input has no known negative affe=
ct
on pool quality
  Differential Revision:        https://reviews.freebsd.org/D12610

Changes:
  head/sys/dev/random/fortuna.c

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