git: kernel - Rejigger random number generator to be per-cpu 2/2

[Matthew Dillon]

commit 3af807019f4261ab54dd1102b8fbc883847758d2
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date:   Sat Feb 1 23:45:16 2020 -0800

    kernel - Rejigger random number generator to be per-cpu 2/2
    
    * The initializer tries to diverge each cpu's csprng a bit more
      now.  These initial conditions are not intended to produce secure
      random numbers, but they should be reasonably secure by the time the
      kernel is finished booting.
    
    * Once the csprng is operational, do not always inject the same
      entropy into both csprngs since that would make having two and
      XOR'ing the results together kinda worthless.
    
    * If RDRAND is available the csprng will get new injections 25 times
      a second on each cpu.  Without it, however, entropy injection is
      relatively slow.

Summary of changes:
 sys/kern/kern_nrandom.c | 55 ++++++++++++++++++++++++++++++++++++++-----------
 sys/sys/csprng.h        |  1 +
 sys/sys/random.h        |  5 ++++-
 3 files changed, 48 insertions(+), 13 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/3af807019f4261ab54dd1102b8fbc883847758d2


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