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<div class="sect1">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="xmlsec-examples-sign-dynamimc-template"></a>Signing a dynamicaly created template.</h2></div></div></div>
<div class="sect2">
<div class="titlepage"><div><div><h3 class="title">
<a name="xmlsec-example-sign2"></a>sign2.c</h3></div></div></div>
<div class="informalexample"><pre class="programlisting">
/**
 * XML Security Library example: Signing a file with a dynamicaly created template.
 *
 * Signs a file using a dynamicaly created template and key from PEM file.
 * The signature has one reference with one enveloped transform to sign
 * the whole document except the &lt;dsig:Signature/&gt; node itself.
 *
 * Usage:
 *      sign2 &lt;xml-doc&gt; &lt;pem-key&gt;
 *
 * Example:
 *      ./sign2 sign2-doc.xml rsakey.pem &gt; sign2-res.xml
 *
 * The result signature could be validated using verify1 example:
 *      ./verify1 sign2-res.xml rsapub.pem
 *
 * This is free software; see Copyright file in the source
 * distribution for preciese wording.
 *
 * Copyright (C) 2002-2024 Aleksey Sanin &lt;aleksey@aleksey.com&gt;. All Rights Reserved.
 */
#include &lt;stdlib.h&gt;
#include &lt;string.h&gt;
#include &lt;assert.h&gt;

#include &lt;libxml/tree.h&gt;
#include &lt;libxml/xmlmemory.h&gt;
#include &lt;libxml/parser.h&gt;

#ifndef XMLSEC_NO_XSLT
#include &lt;libxslt/xslt.h&gt;
#include &lt;libxslt/security.h&gt;
#endif /* XMLSEC_NO_XSLT */

#include &lt;xmlsec/xmlsec.h&gt;
#include &lt;xmlsec/xmltree.h&gt;
#include &lt;xmlsec/xmldsig.h&gt;
#include &lt;xmlsec/templates.h&gt;
#include &lt;xmlsec/crypto.h&gt;

int sign_file(const char* xml_file, const char* key_file);

int
main(int argc, char **argv) {
#ifndef XMLSEC_NO_XSLT
    xsltSecurityPrefsPtr xsltSecPrefs = NULL;
#endif /* XMLSEC_NO_XSLT */

    assert(argv);

    if(argc != 3) {
        fprintf(stderr, "Error: wrong number of arguments.\n");
        fprintf(stderr, "Usage: %s &lt;xml-file&gt; &lt;key-file&gt;\n", argv[0]);
        return(1);
    }

    /* 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 libxslt */
#ifndef XMLSEC_NO_XSLT
    /* disable everything */
    xsltSecPrefs = xsltNewSecurityPrefs();
    xsltSetSecurityPrefs(xsltSecPrefs,  XSLT_SECPREF_READ_FILE,        xsltSecurityForbid);
    xsltSetSecurityPrefs(xsltSecPrefs,  XSLT_SECPREF_WRITE_FILE,       xsltSecurityForbid);
    xsltSetSecurityPrefs(xsltSecPrefs,  XSLT_SECPREF_CREATE_DIRECTORY, xsltSecurityForbid);
    xsltSetSecurityPrefs(xsltSecPrefs,  XSLT_SECPREF_READ_NETWORK,     xsltSecurityForbid);
    xsltSetSecurityPrefs(xsltSecPrefs,  XSLT_SECPREF_WRITE_NETWORK,    xsltSecurityForbid);
    xsltSetDefaultSecurityPrefs(xsltSecPrefs);
#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(NULL) &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 and/or LTDL_LIBRARY_PATH) environment variables.\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);
    }

    if(sign_file(argv[1], argv[2]) &lt; 0) {
        return(-1);
    }

    /* Shutdown xmlsec-crypto library */
    xmlSecCryptoShutdown();

    /* Shutdown crypto library */
    xmlSecCryptoAppShutdown();

    /* Shutdown xmlsec library */
    xmlSecShutdown();

    /* Shutdown libxslt/libxml */
#ifndef XMLSEC_NO_XSLT
    xsltFreeSecurityPrefs(xsltSecPrefs);
    xsltCleanupGlobals();
#endif /* XMLSEC_NO_XSLT */
    xmlCleanupParser();

    return(0);
}

/**
 * sign_file:
 * @xml_file:           the XML file name.
 * @key_file:           the PEM private key file name.
 *
 * Signs the #xml_file using private key from #key_file and dynamicaly
 * created enveloped signature template.
 *
 * Returns 0 on success or a negative value if an error occurs.
 */
int
sign_file(const char* xml_file, const char* key_file) {
    xmlDocPtr doc = NULL;
    xmlNodePtr signNode = NULL;
    xmlNodePtr refNode = NULL;
    xmlNodePtr keyInfoNode = NULL;
    xmlSecDSigCtxPtr dsigCtx = NULL;
    int res = -1;

    assert(xml_file);
    assert(key_file);

    /* load doc file */
    doc = xmlReadFile(xml_file, NULL, XML_PARSE_PEDANTIC | XML_PARSE_NONET);
    if ((doc == NULL) || (xmlDocGetRootElement(doc) == NULL)){
        fprintf(stderr, "Error: unable to parse file \"%s\"\n", xml_file);
        goto done;
    }

    /* create signature template for RSA-SHA1 enveloped signature */
    signNode = xmlSecTmplSignatureCreate(doc, xmlSecTransformExclC14NId,
                                         xmlSecTransformRsaSha1Id, NULL);
    if(signNode == NULL) {
        fprintf(stderr, "Error: failed to create signature template\n");
        goto done;
    }

    /* add &lt;dsig:Signature/&gt; node to the doc */
    xmlAddChild(xmlDocGetRootElement(doc), signNode);

    /* add reference */
    refNode = xmlSecTmplSignatureAddReference(signNode, xmlSecTransformSha1Id,
                                        NULL, BAD_CAST "", NULL);
    if(refNode == NULL) {
        fprintf(stderr, "Error: failed to add reference to signature template\n");
        goto done;
    }

    /* add enveloped transform */
    if(xmlSecTmplReferenceAddTransform(refNode, xmlSecTransformEnvelopedId) == NULL) {
        fprintf(stderr, "Error: failed to add enveloped transform to reference\n");
        goto done;
    }

    /* add &lt;dsig:KeyInfo/&gt; and &lt;dsig:KeyName/&gt; nodes to put key name in the signed document */
    keyInfoNode = xmlSecTmplSignatureEnsureKeyInfo(signNode, NULL);
    if(keyInfoNode == NULL) {
        fprintf(stderr, "Error: failed to add key info\n");
        goto done;
    }

    if(xmlSecTmplKeyInfoAddKeyName(keyInfoNode, NULL) == NULL) {
        fprintf(stderr, "Error: failed to add key name\n");
        goto done;
    }

    /* create signature context, we don't need keys manager in this example */
    dsigCtx = xmlSecDSigCtxCreate(NULL);
    if(dsigCtx == NULL) {
        fprintf(stderr,"Error: failed to create signature context\n");
        goto done;
    }

    /* load private key, assuming that there is not password */
    dsigCtx-&gt;signKey = xmlSecCryptoAppKeyLoadEx(key_file, xmlSecKeyDataTypePrivate, xmlSecKeyDataFormatPem, NULL, NULL, NULL);
    if(dsigCtx-&gt;signKey == NULL) {
        fprintf(stderr,"Error: failed to load private pem key from \"%s\"\n", key_file);
        goto done;
    }

    /* set key name to the file name, this is just an example! */
    if(xmlSecKeySetName(dsigCtx-&gt;signKey, BAD_CAST key_file) &lt; 0) {
        fprintf(stderr,"Error: failed to set key name for key from \"%s\"\n", key_file);
        goto done;
    }

    /* sign the template */
    if(xmlSecDSigCtxSign(dsigCtx, signNode) &lt; 0) {
        fprintf(stderr,"Error: signature failed\n");
        goto done;
    }

    /* print signed document to stdout */
    xmlDocDump(stdout, doc);

    /* success */
    res = 0;

done:
    /* cleanup */
    if(dsigCtx != NULL) {
        xmlSecDSigCtxDestroy(dsigCtx);
    }

    if(doc != NULL) {
        xmlFreeDoc(doc);
    }
    return(res);
}
</pre></div>
</div>
<div class="sect2">
<div class="titlepage"><div><div><h3 class="title">
<a name="xmlsec-example-sign2-doc"></a>sign2-doc.xml</h3></div></div></div>
<div class="informalexample"><pre class="programlisting">
&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;!-- 
XML Security Library example: Original XML doc file for sign2 example. 
--&gt;
&lt;Envelope xmlns="urn:envelope"&gt;
  &lt;Data&gt;
	Hello, World!
  &lt;/Data&gt;
&lt;/Envelope&gt;
</pre></div>
</div>
<div class="sect2">
<div class="titlepage"><div><div><h3 class="title">
<a name="xmlsec-example-sign2-res"></a>sign2-res.xml</h3></div></div></div>
<div class="informalexample"><pre class="programlisting">
&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;!-- 
XML Security Library example: Original XML doc file for sign2 example. 
--&gt;
&lt;Envelope xmlns="urn:envelope"&gt;
  &lt;Data&gt;
	Hello, World!
  &lt;/Data&gt;
&lt;Signature xmlns="http://www.w3.org/2000/09/xmldsig#"&gt;
&lt;SignedInfo&gt;
&lt;CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/&gt;
&lt;SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1"/&gt;
&lt;Reference URI=""&gt;
&lt;Transforms&gt;
&lt;Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/&gt;
&lt;/Transforms&gt;
&lt;DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/&gt;
&lt;DigestValue&gt;HjY8ilZAIEM2tBbPn5mYO1ieIX4=&lt;/DigestValue&gt;
&lt;/Reference&gt;
&lt;/SignedInfo&gt;
&lt;SignatureValue&gt;fUkinGC3hXEUrjJoq8Uc1Gtky7+4AumhtYV5804diUqbFh/SbQI5iPOnJojz0xZK
WFG9pbfsiWyiqTYlenqDng==&lt;/SignatureValue&gt;
&lt;KeyInfo&gt;
&lt;KeyName&gt;rsakey.pem&lt;/KeyName&gt;
&lt;/KeyInfo&gt;
&lt;/Signature&gt;&lt;/Envelope&gt;
</pre></div>
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