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NetBSD 6.1.5 - man page for rndctl (netbsd section 8)

RNDCTL(8)			   BSD System Manager's Manual				RNDCTL(8)

NAME
     rndctl -- in-kernel random number generator management tool

SYNOPSIS
     rndctl -CcEe [-d devname | -t devtype]
     rndctl -ls [-d devname | -t devtype]
     rndctl -L save-file
     rndctl -S save-file

DESCRIPTION
     The rndctl program displays statistics on the current state of the rnd(4) pseudo-driver, and
     allows the administrator to control which sources are allowed to contribute to the random-
     ness pool maintained by rnd(4), as well as whether a given source counts as strongly random.

     The following options are available:

     -C      Disable collection of timing information for the given device name or device type.

     -c      Enable collection of timing information for the given device name or device type.

     -d      Only the device named devname is altered or displayed.  This is mutually exclusive
	     with -t.

     -E      Disable entropy estimation from the collected timing information for the given
	     device name or device type.  If collection is still enabled, timing information is
	     still collected and mixed into the internal entropy pool, but no entropy is assumed
	     to be present.

     -e      Enable entropy estimation using the collected timing information for the given
	     device name or device type.

     -L      Load saved entropy from file save-file, which will be overwritten and deleted before
	     the entropy is loaded into the kernel.

     -l      List all sources, or, if the -t or -d flags are specified, only those specified by
	     the devtype or devname specified.

     -S      Save entropy pool to file save-file.  The file format is specific to rndctl and
	     includes an estimate of the amount of saved entropy and a checksum.

     -s      Display statistics on the current state of the random collection pool.

     -t      All devices of type devtype are altered or displayed.  This is mutually exclusive
	     with -d.

	     The available types are:

	     disk   Physical hard drives.

	     net    Network interfaces.

	     tape   Tape devices.

	     tty    Terminal, mouse, or other user input devices.

	     rng    Random number generators.

FILES
     /dev/random    Returns ``good'' values only.
     /dev/urandom   Always returns data, degenerates to a pseudo-random generator.

SEE ALSO
     rnd(4), rnd(9)

HISTORY
     The rndctl program was first made available in NetBSD 1.3.

AUTHORS
     The rndctl program was written by Michael Graff <explorer@flame.org>.

BUGS
     Turning on entropy estimation from unsafe or predictable sources will weaken system secu-
     rity, while turning on entropy collection from such sources may weaken system security.

     Care should be taken when using this command.

BSD					November 23, 2011				      BSD


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