Add DEV_RANDOM pseudo-option and use it to "include out" random(4)

if desired.

Retire randomdev_none.c and introduce random_infra.c for resident
infrastructure. Completely stub out random(4) calls in the "without
DEV_RANDOM" case.

Add RANDOM_LOADABLE option to allow loadable Yarrow/Fortuna/LocallyWritten
algorithm.  Add a skeleton "other" algorithm framework for folks
to add their own processing code. NIST, anyone?

Retire the RANDOM_DUMMY option.

Build modules for Yarrow, Fortuna and "other".

Use atomics for the live entropy rate-tracking.

Convert ints to bools for the 'seeded' logic.

Move _write() function from the algorithm-specific areas to randomdev.c

Get rid of reseed() function - it is unused.

Tidy up the opt_*.h includes.

Update documentation for random(4) modules.

Fix test program (reviewers, please leave this).

Differential Revision:    https://reviews.freebsd.org/D3354
Reviewed by:              wblock,delphij,jmg,bjk
Approved by:              so (/dev/random blanket)

1 files changed, 4 insertions, 3 deletions

diff --git a/sys/conf/NOTES b/sys/conf/NOTES
index b0619cb..7bc2048 100644
--- a/sys/conf/NOTES
+++ b/sys/conf/NOTES
@@ -2981,9 +2981,10 @@ options 	MAXFILES=999
 
 # Random number generator
 # Only ONE of the below two may be used; they are mutually exclusive.
-# If neither is present, then the Fortuna algorithm is used.
-options 	RANDOM_YARROW	# Yarrow CSPRNG (old default)
-#options 	RANDOM_DUMMY	# Dummy CSPRNG that always blocks
+# If neither is present, then the Fortuna algorithm is selected.
+#options 	RANDOM_YARROW	# Yarrow CSPRNG (old default)
+#options 	RANDOM_LOADABLE	# Allow the algorithm to be loaded as
+				# a module.
 # For developers.
 options 	RANDOM_DEBUG	# Extra debugging messages