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<title>genrandom(3) - Plan 9 from User Space</title>
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<tr><td width=20><td><b>GENRANDOM(3)</b><td align=right><b>GENRANDOM(3)</b>
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<p><font size=+1><b>NAME </b></font><br>
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genrandom, prng &ndash; random number generation<br>
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<p><font size=+1><b>SYNOPSIS </b></font><br>
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<tt><font size=+1>#include &lt;u.h&gt;<br>
#include &lt;libc.h&gt;<br>
#include &lt;mp.h&gt;<br>
#include &lt;libsec.h&gt;
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<tt><font size=+1>void genrandom(uchar *buf, int nbytes)
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<tt><font size=+1>void prng(uchar *buf, int nbytes)<br>
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<p><font size=+1><b>DESCRIPTION </b></font><br>
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Most security software requires a source of random or, at the
very least, unguessable numbers.
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<i>Genrandom</i> fills a buffer with bytes from the X9.17 pseudo-random
number generator. The X9.17 generator is seeded by 24 truly random
bytes read via <i>truerand</i> (see <a href="../man3/rand.html"><i>rand</i>(3)</a>).
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<i>Prng</i> uses the native <a href="../man3/rand.html"><i>rand</i>(3)</a> pseudo-random number generator to
fill the buffer. Used with <i>srand</i>, this function can produce a
reproducible stream of pseudo random numbers useful in testing.
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Both functions may be passed to <i>mprand</i> (see <a href="../man3/mp.html"><i>mp</i>(3)</a>).<br>
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<p><font size=+1><b>SOURCE </b></font><br>
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<tt><font size=+1>/usr/local/plan9/src/libsec<br>
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<p><font size=+1><b>SEE ALSO </b></font><br>
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<a href="../man3/mp.html"><i>mp</i>(3)</a><br>
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