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