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<span id="Authentication"></span><div class="header">
<p>
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<span id="Generating-authentication-keys"></span><h3 class="section">3.2 Generating authentication keys</h3>
<span id="index-authentication"></span>
<span id="index-parallel_005fgenerate_005fsrp_005fdata-2"></span>
<span id="XREFparallel_005fgenerate_005fsrp_005fdata"></span><dl>
<dt id="index-parallel_005fgenerate_005fsrp_005fdata">Loadable Function: <em></em> <strong>parallel_generate_srp_data</strong> <em>(<var>username</var>)</em></dt>
<dt id="index-parallel_005fgenerate_005fsrp_005fdata-1">Loadable Function: <em></em> <strong>parallel_generate_srp_data</strong> <em>(<var>username</var>, <var>options</var>)</em></dt>
<dd><p>Prompts for a password (press enter for a random password) and writes TLS-SRP authentication files into the directory given by:
</p>
<p><code>fullfile (a = pkg ("prefix"), "parallel-srp-data")</code>
</p>
<p>Server files are placed in subdirectory <code>server</code>. By default, a
client authentication file is placed in subdirectory
<code>client</code>. The latter contains the given <var>username</var> and the
cleartext password. You do not need this file if you prefer to be
prompted for username and password at connection time. In this case,
you can prevent the client authentication file from being written by
passing as the argument <var>options</var> a structure with a value of
<code>false</code> in the field <code>unattended</code>.
</p>
<p>For authentication, subdir <code>server</code>, and possibly subdir
<code>client</code>, have to be placed together with their contents at the
respective machines (but see "Notes" below). They can either be
placed under the directory given by:
</p>
<p><code>fullfile (OCTAVE_HOME (), "share", "octave", "parallel-srp-data")</code>
</p>
<p>or – which might be the same directory – under:
</p>
<p><code>fullfile (a = pkg ("prefix"), "parallel-srp-data")</code>
</p>
<p>Files in the former directory will take precedence over those in the
latter. The contents of the files <code>passwd</code> and <code>user_passwd</code>
(if present) must be kept secret.
</p>
<p>Notes: One of the two server files is named "passwd". It contains one
line per user – the line starts with the username and a ":". If this
file pre-exists, the new line will be appended to it. You may have to
manually merge this file with a potentially pre-existing file at the
server machine, e.g. if you want to add a new user there. Also, you
have to manually assure that in the version of this file at the server
machine each username appears only once (i.e. old lines for the same
user may have to be deleted). The username is arbitrary.
</p>
<p>This function zeroizes sensitive data before releasing its memory. Due
to usage of external libraries, however, it still can’t be excluded
that sensitive data is still on the swap device after application
shutdown.
</p>
<p><strong>See also:</strong> <a href="pconnect.html#XREFpconnect">pconnect</a>, <a href="pserver.html#XREFpserver">pserver</a>, <a href="reval.html#XREFreval">reval</a>, <a href="psend.html#XREFpsend">psend</a>, <a href="precv.html#XREFprecv">precv</a>, <a href="sclose.html#XREFsclose">sclose</a>, <a href="select_005fsockets.html#XREFselect_005fsockets">select_sockets</a>.
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