IPSEC_RANBITS

NAME
SYNOPSIS
DESCRIPTION
FILES
SEE ALSO
HISTORY
BUGS

NAME

ipsec ranbits − generate random bits in ASCII form

SYNOPSIS

ipsec ranbits [ −−quick ] [ −−continuous ] [ −−bytes ] nbits

DESCRIPTION

Ranbits obtains nbits (rounded up to the nearest byte) high-quality random bits from random(4), and emits them on standard output as an ASCII string. The default output format is datatot(3) h format: lowercase hexadecimal with a 0x prefix and an underscore every 32 bits.

The −−quick option produces quick-and-dirty random bits: instead of using the high-quality random bits from /dev/random, which may take some time to supply the necessary bits if nbits is large, ranbits uses /dev/urandom, which yields prompt results but lower-quality randomness.

The −−continuous option uses datatot(3) x output format, like h but without the underscores.

The −−bytes option causes nbits to be interpreted as a byte count rather than a bit count.

FILES

/dev/random, /dev/urandom

SEE ALSO

ipsec_datatot(3), random(4)

HISTORY

Written for the Linux FreeS/WAN project <http://www.freeswan.org> by Henry Spencer.

BUGS

There is an internal limit on nbits, currently 20000.

Without −−quick, ranbits’s run time is difficult to predict. A request for a large number of bits, at a time when the system’s entropy pool is low on randomness, may take quite a while to satisfy.