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<div class="CHAPTER">
<h1>
<a name="XMLSEC-NOTES-INIT-SHUTDOWN"></a>Initialization and shutdown.</h1>
<p>XML Security Library initialization/shutdown
process includes initialization and shutdown of the
dependent libraries:
</p>
<p></p>
<ul>
<li><p>libxml library;</p></li>
<li><p>libxslt library;</p></li>
<li><p>crypto library (OpenSSL, GnuTLS, GCrypt, NSS, ...);</p></li>
<li><p>xmlsec library
(<a href="xmlsec-xmlsec.html#XMLSECINIT">xmlSecInit</a>
and <a href="xmlsec-xmlsec.html#XMLSECSHUTDOWN">xmlSecShutdown</a>
functions);
</p></li>
<li><p>xmlsec-crypto library
(<a href="xmlsec-dl.html#XMLSECCRYPTODLLOADLIBRARY">xmlSecCryptoDLLoadLibrary</a>
to load xmlsec-crypto library dynamicaly if needed,
<a href="xmlsec-app.html#XMLSECCRYPTOINIT">xmlSecCryptoInit</a>
and <a href="xmlsec-app.html#XMLSECCRYPTOSHUTDOWN">xmlSecCryptoShutdown</a>
functions);
</p></li>
</ul>
xmlsec-crypto library also provides a convinient functions
<font>xmlSecAppCryptoInit</font>
and <font>xmlSecAppCryptoShutdown</font>
to initialize the crypto library itself but application can do it
by itself.
<p> </p>
<div class="EXAMPLE">
<a name="AEN137"></a><p><b>Example 1. Initializing application.</b></p>
<pre class="PROGRAMLISTING"> /* Init libxml and libxslt libraries */
xmlInitParser();
LIBXML_TEST_VERSION
xmlLoadExtDtdDefaultValue = XML_DETECT_IDS | XML_COMPLETE_ATTRS;
xmlSubstituteEntitiesDefault(1);
#ifndef XMLSEC_NO_XSLT
xmlIndentTreeOutput = 1;
#endif /* XMLSEC_NO_XSLT */
/* Init xmlsec library */
if(xmlSecInit() < 0) {
fprintf(stderr, "Error: xmlsec initialization failed.\n");
return(-1);
}
/* Check loaded library version */
if(xmlSecCheckVersion() != 1) {
fprintf(stderr, "Error: loaded xmlsec library version is not compatible.\n");
return(-1);
}
/* Load default crypto engine if we are supporting dynamic
* loading for xmlsec-crypto libraries. Use the crypto library
* name ("openssl", "nss", etc.) to load corresponding
* xmlsec-crypto library.
*/
#ifdef XMLSEC_CRYPTO_DYNAMIC_LOADING
if(xmlSecCryptoDLLoadLibrary(BAD_CAST XMLSEC_CRYPTO) < 0) {
fprintf(stderr, "Error: unable to load default xmlsec-crypto library. Make sure\n"
"that you have it installed and check shared libraries path\n"
"(LD_LIBRARY_PATH) envornment variable.\n");
return(-1);
}
#endif /* XMLSEC_CRYPTO_DYNAMIC_LOADING */
/* Init crypto library */
if(xmlSecCryptoAppInit(NULL) < 0) {
fprintf(stderr, "Error: crypto initialization failed.\n");
return(-1);
}
/* Init xmlsec-crypto library */
if(xmlSecCryptoInit() < 0) {
fprintf(stderr, "Error: xmlsec-crypto initialization failed.\n");
return(-1);
}
</pre>
</div>
<p> </p>
<div class="EXAMPLE">
<a name="AEN141"></a><p><b>Example 2. Shutting down application.</b></p>
<pre class="PROGRAMLISTING"> /* Shutdown xmlsec-crypto library */
xmlSecCryptoShutdown();
/* Shutdown crypto library */
xmlSecCryptoAppShutdown();
/* Shutdown xmlsec library */
xmlSecShutdown();
/* Shutdown libxslt/libxml */
#ifndef XMLSEC_NO_XSLT
xsltCleanupGlobals();
#endif /* XMLSEC_NO_XSLT */
xmlCleanupParser();
</pre>
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