DragonFly On-Line Manual Pages

RDRAND(4)             DragonFly Kernel Interfaces Manual             RDRAND(4)

NAME
     rdrand -- driver for the RNG module on Intel CPUs

SYNOPSIS
     To compile this driver into the kernel, place the following lines in your
     kernel configuration file:

           device rdrand

     Alternatively, to load the driver as a module at boot time, place the
     following line in loader.conf(5):

           rdrand_load="YES"

DESCRIPTION
     WARNING: This driver is still untested.

     Starting with some models of the Ivy Bridge Core i5/i7, Intel processors
     implement a new set of instructions called RdRand.  This set of instruc-
     tions uses a hardware based RNG providing high-speed true randomness.

     The processor capability is reported as RDRND in the Features2 line at
     boot.  The rdrand driver does not attach on systems that lack the
     required CPU capability.

     The rdrand driver continuously feeds entropy to the kernel's random num-
     ber generator.

SEE ALSO
     intro(4), padlock(4), random(4)

HISTORY
     The rdrand driver first appeared in DragonFly 3.1.

AUTHORS
     The rdrand driver was written by Alex Hornung <alex@alexhornung.com>.

DragonFly 3.5                  February 25, 2012                 DragonFly 3.5