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-<title>3.2 rand -- An interface to the OpenSSL pseudo random number generator </title>
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-<H2><A NAME="SECTION000420000000000000000">&nbsp;</A>
-<BR>
-3.2 <tt class="module">rand</tt> -- An interface to the OpenSSL pseudo random number generator
-</H2>
-
-<P>
-
-
-<P>
-This module handles the OpenSSL pseudo random number generator (PRNG) and
-declares the following:
-
-<P>
-<dl><dt><b><a name='l2h-118'><tt class='function'>add</tt></a></b>(<var>string, entropy</var>)
-<dd>
-Mix bytes from <var>string</var> into the PRNG state. The <var>entropy</var> argument is
-(the lower bound of) an estimate of how much randomness is contained in
-<var>string</var>, measured in bytes. For more information, see e.g. <a class="rfc" name="rfcref-2374"
-href="http://www.ietf.org/rfc/rfc1750.txt">RFC 1750</a>.
-</dl>
-
-<P>
-<dl><dt><b><a name='l2h-119'><tt class='function'>bytes</tt></a></b>(<var>num_bytes</var>)
-<dd>
-Get some random bytes from the PRNG as a string.
-
-<P>
-This is a wrapper for the C function <tt class="function">RAND_bytes</tt>.
-</dl>
-
-<P>
-<dl><dt><b><a name='l2h-120'><tt class='function'>cleanup</tt></a></b>()
-<dd>
-Erase the memory used by the PRNG.
-
-<P>
-This is a wrapper for the C function <tt class="function">RAND_cleanup</tt>.
-</dl>
-
-<P>
-<dl><dt><b><a name='l2h-121'><tt class='function'>egd</tt></a></b>(<var>path</var><big>[</big><var>, bytes</var><big>]</big>)
-<dd>
-Query the Entropy Gathering Daemon<A NAME="tex2html2"
- HREF="#foot1272"><SUP>2</SUP></A> on socket <var>path</var> for <var>bytes</var>
-bytes of random data and and uses <tt class="function">add</tt> to seed the PRNG. The default
-value of <var>bytes</var> is 255.
-</dl>
-
-<P>
-<dl><dt><b><a name='l2h-122'><tt class='function'>load_file</tt></a></b>(<var>path</var><big>[</big><var>, bytes</var><big>]</big>)
-<dd>
-Read <var>bytes</var> bytes (or all of it, if <var>bytes</var> is negative) of data from
-the file <var>path</var> to seed the PRNG. The default value of <var>bytes</var> is -1.
-</dl>
-
-<P>
-<dl><dt><b><a name='l2h-123'><tt class='function'>screen</tt></a></b>()
-<dd>
-Add the current contents of the screen to the PRNG state.
-Availability: Windows.
-</dl>
-
-<P>
-<dl><dt><b><a name='l2h-124'><tt class='function'>seed</tt></a></b>(<var>string</var>)
-<dd>
-This is equivalent to calling <tt class="function">add</tt> with <var>entropy</var> as the length
-of the string.
-</dl>
-
-<P>
-<dl><dt><b><a name='l2h-125'><tt class='function'>status</tt></a></b>()
-<dd>
-Returns true if the PRNG has been seeded with enough data, and false otherwise.
-</dl>
-
-<P>
-<dl><dt><b><a name='l2h-126'><tt class='function'>write_file</tt></a></b>(<var>path</var>)
-<dd>
-Write a number of random bytes (currently 1024) to the file <var>path</var>. This
-file can then be used with <tt class="function">load_file</tt> to seed the PRNG again.
-</dl>
-
-<P>
-<dl><dt><b>exception <a name='l2h-127'><tt class='exception'>Error</tt></a></b>
-<dd>
-If the current RAND method supports any errors, this is raised when needed.
-The default method does not raise this when the entropy pool is depleted.
-
-<P>
-Whenever this exception is raised directly, it has a list of error messages
-from the OpenSSL error queue, where each item is a tuple <code>(<var>lib</var>,
-<var>function</var>, <var>reason</var>)</code>. Here <var>lib</var>, <var>function</var> and <var>reason</var>
-are all strings, describing where and what the problem is. See <span class='manpage'><i>err</i>(3)</span>
-for more information.
-</dl>
-
-<P>
-<BR><HR><H4>Footnotes</H4>
-<DL>
-<DT><A NAME="foot1272">... Daemon</A><A
- href="openssl-rand.html#tex2html2"><SUP>2</SUP></A></DT>
-<DD>See
-<a class="url" href="http://www.lothar.com/tech/crypto/">http://www.lothar.com/tech/crypto/</a>
-
-</DD>
-</DL>
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