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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() &lt; 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) &lt; 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) &lt; 0) {
	fprintf(stderr, "Error: crypto initialization failed.\n");
	return(-1);
    }

    /* Init xmlsec-crypto library */
    if(xmlSecCryptoInit() &lt; 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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