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Content-type: text/html
<HTML><HEAD><TITLE>Manpage of IPSEC_RANBITS</TITLE>
</HEAD><BODY>
<H1>IPSEC_RANBITS</H1>
Section: Maintenance Commands (8)<BR>Updated: 22 Aug 2000<BR><A HREF="#index">Index</A>
<A HREF="http://localhost/cgi-bin/man/man2html">Return to Main Contents</A><HR>
<A NAME="lbAB"> </A>
<H2>NAME</H2>
ipsec ranbits - generate random bits in ASCII form
<A NAME="lbAC"> </A>
<H2>SYNOPSIS</H2>
<B>ipsec</B>
<B>ranbits</B>
[
<B>--quick</B>
] [
<B>--continuous</B>
] [
<B>--bytes</B>
] nbits
<A NAME="lbAD"> </A>
<H2>DESCRIPTION</H2>
<I>Ranbits</I>
obtains
<I>nbits</I>
(rounded up to the nearest byte)
high-quality random bits from
<I><A HREF="random.4.html">random</A></I>(4),
and emits them on standard output as an ASCII string.
The default output format is
<I><A HREF="datatot.3.html">datatot</A></I>(3)
<B>h</B>
format:
lowercase hexadecimal with a
<B>0x</B>
prefix and an underscore every 32 bits.
<P>
The
<B>--quick</B>
option produces quick-and-dirty random bits:
instead of using the high-quality random bits from
<I>/dev/random</I>,
which may take some time to supply the necessary bits if
<I>nbits</I>
is large,
<I>ranbits</I>
uses
<I>/dev/urandom</I>,
which yields prompt results but lower-quality randomness.
<P>
The
<B>--continuous</B>
option uses
<I><A HREF="datatot.3.html">datatot</A></I>(3)
<B>x</B>
output format, like
<B>h</B>
but without the underscores.
<P>
The
<B>--bytes</B>
option causes
<I>nbits</I>
to be interpreted as a byte count rather than a bit count.
<A NAME="lbAE"> </A>
<H2>FILES</H2>
/dev/random, /dev/urandom
<A NAME="lbAF"> </A>
<H2>SEE ALSO</H2>
<A HREF="ipsec_datatot.3.html">ipsec_datatot</A>(3), <A HREF="random.4.html">random</A>(4)
<A NAME="lbAG"> </A>
<H2>HISTORY</H2>
Written for the Linux FreeS/WAN project
<<A HREF="http://www.freeswan.org">http://www.freeswan.org</A>>
by Henry Spencer.
<A NAME="lbAH"> </A>
<H2>BUGS</H2>
There is an internal limit on
<I>nbits</I>,
currently 20000.
<P>
Without
<B>--quick</B>,
<I>ranbits</I>'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.
<P>
<HR>
<A NAME="index"> </A><H2>Index</H2>
<DL>
<DT><A HREF="#lbAB">NAME</A><DD>
<DT><A HREF="#lbAC">SYNOPSIS</A><DD>
<DT><A HREF="#lbAD">DESCRIPTION</A><DD>
<DT><A HREF="#lbAE">FILES</A><DD>
<DT><A HREF="#lbAF">SEE ALSO</A><DD>
<DT><A HREF="#lbAG">HISTORY</A><DD>
<DT><A HREF="#lbAH">BUGS</A><DD>
</DL>
<HR>
This document was created by
<A HREF="http://localhost/cgi-bin/man/man2html">man2html</A>,
using the manual pages.<BR>
Time: 21:40:18 GMT, November 11, 2003
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