NAME
rndcontrol —
a utility for manipulating the
/dev/random device
SYNOPSIS
rndcontrol |
[-q] [-s
irq_no] [-c
irq_no] |
DESCRIPTION
Therndcontrol command is used to set which interrupts
are used to help add entropy to the CSPRNG maintained by the kernel. The
/dev/random and /dev/urandom
devices are the user interface to this source of randomness. Any changes take
effect immediately.
The following command line options are supported:
-q- Turn off all output except errors.
-sn- Allow IRQ n to be used as a source of randomness. This option may be repeated for more than one IRQ.
-cn- Stop IRQ n from being used as a source of randomness. This option may be repeated for more than one IRQ.
By default, all IRQs will help develop entropy. The kernel uses a rate-limited helper thread to add the actual entropy and even fast interrupts should not detrimentally affect a running system.
FILES
- /dev/random
- secure random device
- /dev/urandom
- random device
SEE ALSO
HISTORY
The rndcontrol utility first appeared in
FreeBSD 2.1.5.
AUTHORS
Theodore Ts'o wrote the core code. Mark Murray ported this code to FreeBSD and wrote the support routines and constructed the man pages.
BUGS
Sure to be some.