Provided by: rng-tools_4-0ubuntu2.1_amd64
NAME
rngd - Check and feed random data from hardware device to kernel random device
SYNOPSIS
rngd [-b, --background] [-f, --foreground] [-o, --random-device=file] [-p, --pid- file=file] [-r, --rng-device=file] [-s, --random-step=nnn] [-W, --fill-watermark=nnn] [-d, --no-drng=1|0] [-n, --no-tpm=1|0] [-q, --quiet] [-v, --verbose] [-?, --help] [-V, --version]
DESCRIPTION
This daemon feeds data from a random number generator to the kernel's random number entropy pool, after first checking the data to ensure that it is properly random. The -f or --foreground options can be used to tell rngd to avoid forking on startup. This is typically used for debugging. The -b or --background options, which fork and put rngd into the background automatically, are the default. The -r or --rng-device options can be used to select an alternate source of input, besides the default /dev/hwrandom. The -o or --random-device options can be used to select an alternate entropy output device, besides the default /dev/random. Note that this device must support the Linux kernel /dev/random ioctl API.
OPTIONS
-b, --background Become a daemon (default) -f, --foreground Do not fork and become a daemon -p file, --pid-file=file File used for recording daemon PID, and multiple exclusion (default: /var/run/rngd.pid) -o file, --random-device=file Kernel device used for random number output (default: /dev/random) -r file, --rng-device=file Kernel device used for random number input (default: /dev/hwrandom) -s nnn, --random-step=nnn Number of bytes written to random-device at a time (default: 64) -W n, --fill-watermark=nnn Once we start doing it, feed entropy to random-device until at least fill-watermark bits of entropy are available in its entropy pool (default: 2048). Setting this too high will cause rngd to dominate the contents of the entropy pool. Low values will hurt system performance during entropy starves. Do not set fill-watermark above the size of the entropy pool (usually 4096 bits). -d 1|0, --no-drng=1|0 Do not use drng as a source of random number input (default:0) -n 1|0, --no-tpm=1|0 Do not use tpm as a source of random number input (default:0) -q, --quiet Suppress error messages -v, --verbose Report available entropy sources -?, --help Give a short summary of all program options. -V, --version Print program version
AUTHORS
Philipp Rumpf Jeff Garzik - jgarzik@pobox.com Matt Sottek Brad Hill