RANDOM(4) BSD Kernel Interfaces Manual RANDOM(4)
random, arandom -- random data source devices
The various random devices produce high quality random output data.
Entropy data is collected from system activity (such as disk, network,
and clock device interrupts), and then used to key the ChaCha stream
cipher to generate the output. All the random devices are expected to
provide high quality pseudo-random output data.
The arc4random(3) function in userland libraries should be used instead,
as it works without the need to access these devices every time.
arc4random(3), md5(3), random(3), amdpm(4), glxsb(4), pchb(4),
A random device first appeared in the Linux operating system. This is a
ARC4 routines added by David Mazieres. Changed to use the ChaCha cipher
in OpenBSD 5.5.
No randomness testing suite provided.
BSD January 23, 2014 BSD