Initialization and shutdown.

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XML Security Library Reference Manual
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# Initialization and shutdown. XML Security Library initialization/shutdown process includes initialization and shutdown of the dependent libraries: libxml library; libxslt library; crypto library (OpenSSL, GnuTLS, NSS, ...); xmlsec library (xmlSecInit and xmlSecShutdown functions); xmlsec-crypto library (xmlSecCryptoInit and xmlSecCryptoShutdown functions); xmlsec-crypto library also provides a convinient functions xmlSecAppCryptoInit and xmlSecAppCryptoShutdown to initialize the crypto library itself but application can do it by itself. Example 1. Initializing application.
        /* 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);
        }

        /* 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);
        }
Example 2. Shutting down application.
        /* 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();
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Aleksey Sanin