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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>extra</title>
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                   | 
                  <a href="#gnutls-extra.description" class="shortcut">Description</a>
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<div class="refentry">
<a name="gnutls-extra"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="gnutls-extra.top_of_page"></a>extra</span></h2>
<p>extra</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="gnutls-extra.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">#define             <a class="link" href="gnutls-extra.html#GNUTLS-EXTRA-VERSION:CAPS" title="GNUTLS_EXTRA_VERSION">GNUTLS_EXTRA_VERSION</a>
enum                <a class="link" href="gnutls-extra.html#gnutls-ia-apptype-t" title="enum gnutls_ia_apptype_t">gnutls_ia_apptype_t</a>;
<a class="link" href="gnutls-crypto.html#int" title="int ()"><span class="returnvalue">int</span></a>                 (<a class="link" href="gnutls-extra.html#gnutls-ia-avp-func" title="gnutls_ia_avp_func ()">*gnutls_ia_avp_func</a>)               (<em class="parameter"><code><a class="link" href="gnutls-gnutls.html#gnutls-session-t" title="gnutls_session_t"><span class="type">gnutls_session_t</span></a> session</code></em>,
                                                         <em class="parameter"><code><span class="type">void</span> *ptr</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *last</code></em>,
                                                         <em class="parameter"><code><span class="type">size_t</span> lastlen</code></em>,
                                                         <em class="parameter"><code><span class="type">char</span> **next</code></em>,
                                                         <em class="parameter"><code><span class="type">size_t</span> *nextlen</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="gnutls-extra.html#gnutls-ia-free-client-credentials" title="gnutls_ia_free_client_credentials ()">gnutls_ia_free_client_credentials</a>   ();
<a class="link" href="gnutls-crypto.html#int" title="int ()"><span class="returnvalue">int</span></a>                 <a class="link" href="gnutls-extra.html#gnutls-ia-verify-endphase" title="gnutls_ia_verify_endphase ()">gnutls_ia_verify_endphase</a>           (<em class="parameter"><code><a class="link" href="gnutls-gnutls.html#gnutls-session-t" title="gnutls_session_t"><span class="type">gnutls_session_t</span></a> session</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *checksum</code></em>);
<span class="returnvalue">ssize_t</span>             <a class="link" href="gnutls-extra.html#gnutls-ia-send" title="gnutls_ia_send ()">gnutls_ia_send</a>                      (<em class="parameter"><code><a class="link" href="gnutls-gnutls.html#gnutls-session-t" title="gnutls_session_t"><span class="type">gnutls_session_t</span></a> session</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *data</code></em>,
                                                         <em class="parameter"><code><span class="type">size_t</span> sizeofdata</code></em>);
<span class="returnvalue">ssize_t</span>             <a class="link" href="gnutls-extra.html#gnutls-ia-recv" title="gnutls_ia_recv ()">gnutls_ia_recv</a>                      (<em class="parameter"><code><a class="link" href="gnutls-gnutls.html#gnutls-session-t" title="gnutls_session_t"><span class="type">gnutls_session_t</span></a> session</code></em>,
                                                         <em class="parameter"><code><span class="type">char</span> *data</code></em>,
                                                         <em class="parameter"><code><span class="type">size_t</span> sizeofdata</code></em>);
<a class="link" href="gnutls-crypto.html#int" title="int ()"><span class="returnvalue">int</span></a>                 <a class="link" href="gnutls-extra.html#gnutls-ia-generate-challenge" title="gnutls_ia_generate_challenge ()">gnutls_ia_generate_challenge</a>        (<em class="parameter"><code><a class="link" href="gnutls-gnutls.html#gnutls-session-t" title="gnutls_session_t"><span class="type">gnutls_session_t</span></a> session</code></em>,
                                                         <em class="parameter"><code><span class="type">size_t</span> buffer_size</code></em>);
<a class="link" href="gnutls-crypto.html#int" title="int ()"><span class="returnvalue">int</span></a>                 <a class="link" href="gnutls-extra.html#gnutls-register-md5-handler" title="gnutls_register_md5_handler ()">gnutls_register_md5_handler</a>         (<em class="parameter"><code><span class="type">void</span></code></em>);
const <span class="returnvalue">char</span> *        <a class="link" href="gnutls-extra.html#gnutls-extra-check-version" title="gnutls_extra_check_version ()">gnutls_extra_check_version</a>          (<em class="parameter"><code>const <span class="type">char</span> *req_version</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="gnutls-extra.description"></a><h2>Description</h2>
<p>
</p>
</div>
<div class="refsect1">
<a name="gnutls-extra.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GNUTLS-EXTRA-VERSION:CAPS"></a><h3>GNUTLS_EXTRA_VERSION</h3>
<pre class="programlisting">#define GNUTLS_EXTRA_VERSION GNUTLS_VERSION
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="gnutls-ia-apptype-t"></a><h3>enum gnutls_ia_apptype_t</h3>
<pre class="programlisting">typedef enum {
    GNUTLS_IA_APPLICATION_PAYLOAD = 0,
    GNUTLS_IA_INTERMEDIATE_PHASE_FINISHED = 1,
    GNUTLS_IA_FINAL_PHASE_FINISHED = 2
} gnutls_ia_apptype_t;
</pre>
<p>
Enumeration of different certificate encoding formats.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="GNUTLS-IA-APPLICATION-PAYLOAD:CAPS"></a><span class="term"><code class="literal">GNUTLS_IA_APPLICATION_PAYLOAD</code></span></p></td>
<td>TLS/IA application payload.
</td>
</tr>
<tr>
<td><p><a name="GNUTLS-IA-INTERMEDIATE-PHASE-FINISHED:CAPS"></a><span class="term"><code class="literal">GNUTLS_IA_INTERMEDIATE_PHASE_FINISHED</code></span></p></td>
<td>TLS/IA intermediate phase finished.
</td>
</tr>
<tr>
<td><p><a name="GNUTLS-IA-FINAL-PHASE-FINISHED:CAPS"></a><span class="term"><code class="literal">GNUTLS_IA_FINAL_PHASE_FINISHED</code></span></p></td>
<td>TLS/IA final phase finished.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gnutls-ia-avp-func"></a><h3>gnutls_ia_avp_func ()</h3>
<pre class="programlisting"><a class="link" href="gnutls-crypto.html#int" title="int ()"><span class="returnvalue">int</span></a>                 (*gnutls_ia_avp_func)               (<em class="parameter"><code><a class="link" href="gnutls-gnutls.html#gnutls-session-t" title="gnutls_session_t"><span class="type">gnutls_session_t</span></a> session</code></em>,
                                                         <em class="parameter"><code><span class="type">void</span> *ptr</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *last</code></em>,
                                                         <em class="parameter"><code><span class="type">size_t</span> lastlen</code></em>,
                                                         <em class="parameter"><code><span class="type">char</span> **next</code></em>,
                                                         <em class="parameter"><code><span class="type">size_t</span> *nextlen</code></em>);</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="gnutls-ia-free-client-credentials"></a><h3>gnutls_ia_free_client_credentials ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                gnutls_ia_free_client_credentials   ();</pre>
<p>
This structure is complex enough to manipulate directly thus this
helper function is provided in order to free (deallocate) it.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>sc</code></em> :</span></p></td>
<td>is a <span class="type">gnutls_ia_client_credentials_t</span> structure.</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gnutls-ia-verify-endphase"></a><h3>gnutls_ia_verify_endphase ()</h3>
<pre class="programlisting"><a class="link" href="gnutls-crypto.html#int" title="int ()"><span class="returnvalue">int</span></a>                 gnutls_ia_verify_endphase           (<em class="parameter"><code><a class="link" href="gnutls-gnutls.html#gnutls-session-t" title="gnutls_session_t"><span class="type">gnutls_session_t</span></a> session</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *checksum</code></em>);</pre>
<p>
Verify TLS/IA end phase checksum data.  If verification fails, the
<a class="link" href="gnutls-gnutls.html#GNUTLS-A-INNER-APPLICATION-VERIFICATION:CAPS"><code class="literal">GNUTLS_A_INNER_APPLICATION_VERIFICATION</code></a> alert is sent to the other
sie.
</p>
<p>
This function is called when <a class="link" href="gnutls-extra.html#gnutls-ia-recv" title="gnutls_ia_recv ()"><code class="function">gnutls_ia_recv()</code></a> return
<a class="link" href="gnutls-gnutls.html#GNUTLS-E-WARNING-IA-IPHF-RECEIVED:CAPS" title="GNUTLS_E_WARNING_IA_IPHF_RECEIVED"><code class="literal">GNUTLS_E_WARNING_IA_IPHF_RECEIVED</code></a> or
<a class="link" href="gnutls-gnutls.html#GNUTLS-E-WARNING-IA-FPHF-RECEIVED:CAPS" title="GNUTLS_E_WARNING_IA_FPHF_RECEIVED"><code class="literal">GNUTLS_E_WARNING_IA_FPHF_RECEIVED</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>session</code></em> :</span></p></td>
<td>is a <a class="link" href="gnutls-gnutls.html#gnutls-session-t" title="gnutls_session_t"><span class="type">gnutls_session_t</span></a> structure.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>checksum</code></em> :</span></p></td>
<td>12-byte checksum data, received from <a class="link" href="gnutls-extra.html#gnutls-ia-recv" title="gnutls_ia_recv ()"><code class="function">gnutls_ia_recv()</code></a>.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>Return 0 on successful verification, or an error
code.  If the checksum verification of the end phase message fails,
<a class="link" href="gnutls-gnutls.html#GNUTLS-E-IA-VERIFY-FAILED:CAPS" title="GNUTLS_E_IA_VERIFY_FAILED"><code class="literal">GNUTLS_E_IA_VERIFY_FAILED</code></a> is returned.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gnutls-ia-send"></a><h3>gnutls_ia_send ()</h3>
<pre class="programlisting"><span class="returnvalue">ssize_t</span>             gnutls_ia_send                      (<em class="parameter"><code><a class="link" href="gnutls-gnutls.html#gnutls-session-t" title="gnutls_session_t"><span class="type">gnutls_session_t</span></a> session</code></em>,
                                                         <em class="parameter"><code>const <span class="type">char</span> *data</code></em>,
                                                         <em class="parameter"><code><span class="type">size_t</span> sizeofdata</code></em>);</pre>
<p>
Send TLS/IA application payload data.  This function has the
similar semantics with <code class="function">send()</code>.  The only difference is that it
accepts a GnuTLS session, and uses different error codes.
</p>
<p>
The TLS/IA protocol is synchronous, so you cannot send more than
one packet at a time.  The client always send the first packet.
</p>
<p>
To finish an application phase in the server, use
<code class="function">gnutls_ia_endphase_send()</code>.  The client cannot end an application
phase unilaterally; rather, a client is required to respond with an
endphase of its own if gnutls_ia_recv indicates that the server has
sent one.
</p>
<p>
If the EINTR is returned by the internal push function (the default
is <code class="function">send()</code>} then <a class="link" href="gnutls-gnutls.html#GNUTLS-E-INTERRUPTED:CAPS" title="GNUTLS_E_INTERRUPTED"><code class="literal">GNUTLS_E_INTERRUPTED</code></a> will be returned.  If
<a class="link" href="gnutls-gnutls.html#GNUTLS-E-INTERRUPTED:CAPS" title="GNUTLS_E_INTERRUPTED"><code class="literal">GNUTLS_E_INTERRUPTED</code></a> or <a class="link" href="gnutls-gnutls.html#GNUTLS-E-AGAIN:CAPS" title="GNUTLS_E_AGAIN"><code class="literal">GNUTLS_E_AGAIN</code></a> is returned, you must call
this function again, with the same parameters; alternatively you
could provide a <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> pointer for data, and 0 for size.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>session</code></em> :</span></p></td>
<td>is a <a class="link" href="gnutls-gnutls.html#gnutls-session-t" title="gnutls_session_t"><span class="type">gnutls_session_t</span></a> structure.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>contains the data to send</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sizeofdata</code></em> :</span></p></td>
<td>is the length of the data</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The number of bytes sent, or a negative error code.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gnutls-ia-recv"></a><h3>gnutls_ia_recv ()</h3>
<pre class="programlisting"><span class="returnvalue">ssize_t</span>             gnutls_ia_recv                      (<em class="parameter"><code><a class="link" href="gnutls-gnutls.html#gnutls-session-t" title="gnutls_session_t"><span class="type">gnutls_session_t</span></a> session</code></em>,
                                                         <em class="parameter"><code><span class="type">char</span> *data</code></em>,
                                                         <em class="parameter"><code><span class="type">size_t</span> sizeofdata</code></em>);</pre>
<p>
Receive TLS/IA data.  This function has the similar semantics with
<code class="function">recv()</code>.  The only difference is that it accepts a GnuTLS session,
and uses different error codes.
</p>
<p>
If the server attempt to finish an application phase, this function
will return <a class="link" href="gnutls-gnutls.html#GNUTLS-E-WARNING-IA-IPHF-RECEIVED:CAPS" title="GNUTLS_E_WARNING_IA_IPHF_RECEIVED"><code class="literal">GNUTLS_E_WARNING_IA_IPHF_RECEIVED</code></a> or
<a class="link" href="gnutls-gnutls.html#GNUTLS-E-WARNING-IA-FPHF-RECEIVED:CAPS" title="GNUTLS_E_WARNING_IA_FPHF_RECEIVED"><code class="literal">GNUTLS_E_WARNING_IA_FPHF_RECEIVED</code></a>.  The caller should then invoke
<a class="link" href="gnutls-extra.html#gnutls-ia-verify-endphase" title="gnutls_ia_verify_endphase ()"><code class="function">gnutls_ia_verify_endphase()</code></a>, and if it runs the client side, also
send an endphase message of its own using gnutls_ia_endphase_send.
</p>
<p>
If EINTR is returned by the internal push function (the default is
<em class="parameter"><code>code</code></em>{<code class="function">recv()</code>}) then GNUTLS_E_INTERRUPTED will be returned.  If
GNUTLS_E_INTERRUPTED or GNUTLS_E_AGAIN is returned, you must call
this function again, with the same parameters; alternatively you
could provide a NULL pointer for data, and 0 for size.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>session</code></em> :</span></p></td>
<td>is a <a class="link" href="gnutls-gnutls.html#gnutls-session-t" title="gnutls_session_t"><span class="type">gnutls_session_t</span></a> structure.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>the buffer that the data will be read into, must hold &gt;= 12 bytes.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sizeofdata</code></em> :</span></p></td>
<td>the number of requested bytes, must be &gt;= 12.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The number of bytes received.  A negative error code is
returned in case of an error.  The
<a class="link" href="gnutls-gnutls.html#GNUTLS-E-WARNING-IA-IPHF-RECEIVED:CAPS" title="GNUTLS_E_WARNING_IA_IPHF_RECEIVED"><code class="literal">GNUTLS_E_WARNING_IA_IPHF_RECEIVED</code></a> and
<a class="link" href="gnutls-gnutls.html#GNUTLS-E-WARNING-IA-FPHF-RECEIVED:CAPS" title="GNUTLS_E_WARNING_IA_FPHF_RECEIVED"><code class="literal">GNUTLS_E_WARNING_IA_FPHF_RECEIVED</code></a> errors are returned when an
application phase finished message has been sent by the server.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gnutls-ia-generate-challenge"></a><h3>gnutls_ia_generate_challenge ()</h3>
<pre class="programlisting"><a class="link" href="gnutls-crypto.html#int" title="int ()"><span class="returnvalue">int</span></a>                 gnutls_ia_generate_challenge        (<em class="parameter"><code><a class="link" href="gnutls-gnutls.html#gnutls-session-t" title="gnutls_session_t"><span class="type">gnutls_session_t</span></a> session</code></em>,
                                                         <em class="parameter"><code><span class="type">size_t</span> buffer_size</code></em>);</pre>
<p>
Generate an application challenge that the client cannot control or
predict, based on the TLS/IA inner secret.
</p>
<div class="variablelist"><table border="0">
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<tr>
<td><p><span class="term"><em class="parameter"><code>session</code></em> :</span></p></td>
<td>is a <a class="link" href="gnutls-gnutls.html#gnutls-session-t" title="gnutls_session_t"><span class="type">gnutls_session_t</span></a> structure.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>buffer_size</code></em> :</span></p></td>
<td>size of output buffer.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>Returns 0 on success, or an negative error code.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gnutls-register-md5-handler"></a><h3>gnutls_register_md5_handler ()</h3>
<pre class="programlisting"><a class="link" href="gnutls-crypto.html#int" title="int ()"><span class="returnvalue">int</span></a>                 gnutls_register_md5_handler         (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>
Register a non-libgcrypt based MD5 and HMAC-MD5 handler.  This is
useful if you run Libgcrypt in FIPS-mode.  Normally TLS requires
use of MD5, so without this you cannot use GnuTLS with libgcrypt in
FIPS mode.
</p>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a class="link" href="gnutls-gnutls.html#GNUTLS-E-SUCCESS:CAPS" title="GNUTLS_E_SUCCESS"><code class="literal">GNUTLS_E_SUCCESS</code></a> on success, otherwise an error.</td>
</tr></tbody>
</table></div>
<p class="since">Since 2.6.0</p>
</div>
<hr>
<div class="refsect2">
<a name="gnutls-extra-check-version"></a><h3>gnutls_extra_check_version ()</h3>
<pre class="programlisting">const <span class="returnvalue">char</span> *        gnutls_extra_check_version          (<em class="parameter"><code>const <span class="type">char</span> *req_version</code></em>);</pre>
<p>
Check GnuTLS Extra Library version.
</p>
<p>
See <a class="link" href="gnutls-extra.html#GNUTLS-EXTRA-VERSION:CAPS" title="GNUTLS_EXTRA_VERSION"><code class="literal">GNUTLS_EXTRA_VERSION</code></a> for a suitable <em class="parameter"><code>req_version</code></em> string.
</p>
<div class="variablelist"><table border="0">
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<td><p><span class="term"><em class="parameter"><code>req_version</code></em> :</span></p></td>
<td>version string to compare with, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>Check that the version of the library is at
minimum the one given as a string in <em class="parameter"><code>req_version</code></em> and return the
actual version string of the library; return <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> if the
condition is not met.  If <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> is passed to this function no
check is done and only the version string is returned.</td>
</tr>
</tbody>
</table></div>
</div>
</div>
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