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-.TH IPSEC_RANBITS 8 "22 Aug 2000"
-.\" RCSID $Id: ranbits.8,v 1.1 2004/03/15 20:35:30 as Exp $
-.SH NAME
-ipsec ranbits \- generate random bits in ASCII form
-.SH SYNOPSIS
-.B ipsec
-.B ranbits
-[
-.B \-\-quick
-] [
-.B \-\-continuous
-] [
-.B \-\-bytes
-] nbits
-.SH DESCRIPTION
-.I Ranbits
-obtains
-.I nbits
-(rounded up to the nearest byte)
-high-quality random bits from
-.IR random (4),
-and emits them on standard output as an ASCII string.
-The default output format is
-.IR datatot (3)
-.B h
-format:
-lowercase hexadecimal with a
-.B 0x
-prefix and an underscore every 32 bits.
-.PP
-The
-.B \-\-quick
-option produces quick-and-dirty random bits:
-instead of using the high-quality random bits from
-.IR /dev/random ,
-which may take some time to supply the necessary bits if
-.I nbits
-is large,
-.I ranbits
-uses
-.IR /dev/urandom ,
-which yields prompt results but lower-quality randomness.
-.PP
-The
-.B \-\-continuous
-option uses
-.IR datatot (3)
-.B x
-output format, like
-.B h
-but without the underscores.
-.PP
-The
-.B \-\-bytes
-option causes
-.I nbits
-to be interpreted as a byte count rather than a bit count.
-.SH FILES
-/dev/random, /dev/urandom
-.SH SEE ALSO
-ipsec_datatot(3), random(4)
-.SH HISTORY
-Written for the Linux FreeS/WAN project
-<http://www.freeswan.org>
-by Henry Spencer.
-.SH BUGS
-There is an internal limit on
-.IR nbits ,
-currently 20000.
-.PP
-Without
-.BR \-\-quick ,
-.IR 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.