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<title>GnuTLS 3.2.1: PKCS11 Initialization</title>
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<a name="PKCS11-Initialization"></a>
<div class="header">
<p>
Next: <a href="Accessing-objects-that-require-a-PIN.html#Accessing-objects-that-require-a-PIN" accesskey="n" rel="next">Accessing objects that require a PIN</a>, Up: <a href="Smart-cards-and-HSMs.html#Smart-cards-and-HSMs" accesskey="u" rel="up">Smart cards and HSMs</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Function-and-Data-Index.html#Function-and-Data-Index" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<a name="Initialization-1"></a>
<h4 class="subsection">5.2.1 Initialization</h4>
<p>To allow all the <acronym>GnuTLS</acronym> applications to access <acronym>PKCS</acronym> #11 tokens
you can use a configuration per module, stored in <code>/etc/pkcs11/modules/</code>.
These are the configuration files of <acronym>p11-kit</acronym><a name="DOCF8" href="#FOOT8"><sup>8</sup></a>.
For example a file that will load the <acronym>OpenSC</acronym> module, could be named
<code>/etc/pkcs11/modules/opensc</code> and contain the following:
</p>
<div class="example">
<pre class="example">module: /usr/lib/opensc-pkcs11.so
</pre></div>
<p>If you use this file, then there is no need for other initialization in
<acronym>GnuTLS</acronym>, except for the PIN and token functions (see next section).
In several cases, however, it is desirable to limit badly behaving modules
(e.g., modules that add an unacceptable delay on initialization)
to single applications. That can be done using the “enable-in:” option
followed by the base name of applications that this module should be used.
</p>
<p>In all cases, you may also manually initialize the PKCS #11 subsystem if the
default settings are not desirable.
</p>
<dl>
<dt><a name="index-gnutls_005fpkcs11_005finit"></a>Function: <em>int</em> <strong>gnutls_pkcs11_init</strong> <em>(unsigned int <var>flags</var>, const char * <var>deprecated_config_file</var>)</em></dt>
<dd><p><var>flags</var>: <code>GNUTLS_PKCS11_FLAG_MANUAL</code> or <code>GNUTLS_PKCS11_FLAG_AUTO</code>
</p>
<p><var>deprecated_config_file</var>: either NULL or the location of a deprecated
configuration file
</p>
<p>This function will initialize the PKCS 11 subsystem in gnutls. It will
read configuration files if <code>GNUTLS_PKCS11_FLAG_AUTO</code> is used or allow
you to independently load PKCS 11 modules using <code>gnutls_pkcs11_add_provider()</code>
if <code>GNUTLS_PKCS11_FLAG_MANUAL</code> is specified.
</p>
<p>Normally you don’t need to call this function since it is being called
by <code>gnutls_global_init()</code> using the <code>GNUTLS_PKCS11_FLAG_AUTO</code> . If other option
is required then it must be called before it.
</p>
<p><strong>Returns:</strong> On success, <code>GNUTLS_E_SUCCESS</code> (0) is returned, otherwise a
negative error value.
</p>
<p><strong>Since:</strong> 2.12.0
</p></dd></dl>
<p>Note that PKCS #11 modules must be reinitialized on the child processes
after a <code>fork</code>. <acronym>GnuTLS</acronym> provides <a href="PKCS-11-API.html#gnutls_005fpkcs11_005freinit">gnutls_pkcs11_reinit</a>
to be called for this purpose.
</p>
<dl>
<dt><a name="index-gnutls_005fpkcs11_005freinit"></a>Function: <em>int</em> <strong>gnutls_pkcs11_reinit</strong> <em>( <var>void</var>)</em></dt>
<dd>
<p>This function will reinitialize the PKCS 11 subsystem in gnutls.
This is required by PKCS 11 when an application uses <code>fork()</code> . The
reinitialization function must be called on the child.
</p>
<p><strong>Returns:</strong> On success, <code>GNUTLS_E_SUCCESS</code> (0) is returned, otherwise a
negative error value.
</p>
<p><strong>Since:</strong> 3.0
</p></dd></dl>
<div class="footnote">
<hr>
<h4 class="footnotes-heading">Footnotes</h4>
<h3><a name="FOOT8" href="#DOCF8">(8)</a></h3>
<p><a href="http://p11-glue.freedesktop.org/">http://p11-glue.freedesktop.org/</a></p>
</div>
<hr>
<div class="header">
<p>
Next: <a href="Accessing-objects-that-require-a-PIN.html#Accessing-objects-that-require-a-PIN" accesskey="n" rel="next">Accessing objects that require a PIN</a>, Up: <a href="Smart-cards-and-HSMs.html#Smart-cards-and-HSMs" accesskey="u" rel="up">Smart cards and HSMs</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Function-and-Data-Index.html#Function-and-Data-Index" title="Index" rel="index">Index</a>]</p>
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