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<title>Signing with X509 certificate.</title>
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<br clear="all"><div class="SECT1">
<h1 class="SECT1"><a name="XMLSEC-EXAMPLES-SIGN-X509">Signing with X509 certificate.</a></h1>
<br clear="all"><div class="SECT2">
<h2 class="SECT2"><a name="XMLSEC-EXAMPLE-SIGN3">sign3.c</a></h2>
<p></p>
<div class="INFORMALEXAMPLE">
<p></p>
<a name="AEN684"></a><pre class="PROGRAMLISTING">/** 
 * XML Security Library example: Signing a file with a dynamicaly created template and an X509 certificate.
 * 
 * Signs a file using a dynamicaly created template, key from PEM file and
 * an X509 certificate. The signature has one reference with one enveloped 
 * transform to sign the whole document except the &lt;dsig:Signature/&gt; node 
 * itself. The key certificate is written in the &lt;dsig:X509Data/&gt; node.
 * 
 * This example was developed and tested with OpenSSL crypto library. The 
 * certificates management policies for another crypto library may break it.
 * 
 * Usage: 
 *      sign3 &lt;xml-doc&gt; &lt;pem-key&gt; 
 *
 * Example:
 *      ./sign3 sign3-doc.xml rsakey.pem rsacert.pem &gt; sign3-res.xml
 *
 * The result signature could be validated using verify3 example:
 *      ./verify3 sign3-res.xml rootcert.pem
 *
 * This is free software; see Copyright file in the source
 * distribution for preciese wording.
 * 
 * Copyright (C) 2002-2003 Aleksey Sanin &lt;aleksey@aleksey.com&gt;
 */
#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, const char* cert_file);

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

    assert(argv);

    if(argc != 4) {
        fprintf(stderr, "Error: wrong number of arguments.\n");
        fprintf(stderr, "Usage: %s &lt;xml-file&gt; &lt;key-file&gt; &lt;cert-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(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);
    }

    if(sign_file(argv[1], argv[2], argv[3]) &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.
 * @cert_file:          the x509 certificate PEM file.
 *
 * Signs the @xml_file using private key from @key_file and dynamicaly
 * created enveloped signature template. The certificate from @cert_file
 * is placed in the &lt;dsig:X509Data/&gt; node.
 *
 * Returns 0 on success or a negative value if an error occurs.
 */
int 
sign_file(const char* xml_file, const char* key_file, const char* cert_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);
    assert(cert_file);

    /* load doc file */
    doc = xmlParseFile(xml_file);
    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, NULL, 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:X509Data/&gt; */
    keyInfoNode = xmlSecTmplSignatureEnsureKeyInfo(signNode, NULL);
    if(keyInfoNode == NULL) {
        fprintf(stderr, "Error: failed to add key info\n");
        goto done;              
    }
    
    if(xmlSecTmplKeyInfoAddX509Data(keyInfoNode) == NULL) {
        fprintf(stderr, "Error: failed to add X509Data node\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 = xmlSecCryptoAppKeyLoad(key_file, 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;
    }
    
    /* load certificate and add to the key */
    if(xmlSecCryptoAppKeyCertLoad(dsigCtx-&gt;signKey, cert_file, xmlSecKeyDataFormatPem) &lt; 0) {
        fprintf(stderr,"Error: failed to load pem certificate \"%s\"\n", cert_file);
        goto done;
    }

    /* set key name to the file name, this is just an example! */
    if(xmlSecKeySetName(dsigCtx-&gt;signKey, 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>
<p></p>
</div>
</div>
<br clear="all"><div class="SECT2">
<h2 class="SECT2"><a name="XMLSEC-EXAMPLE-SIGN3-DOC">sign3-doc.xml</a></h2>
<p></p>
<div class="INFORMALEXAMPLE">
<p></p>
<a name="AEN689"></a><pre class="PROGRAMLISTING">&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;!-- 
XML Security Library example: Original XML doc file for sign3 example. 
--&gt;
&lt;Envelope xmlns="urn:envelope"&gt;
  &lt;Data&gt;
	Hello, World!
  &lt;/Data&gt;
&lt;/Envelope&gt;</pre>
<p></p>
</div>
</div>
<br clear="all"><div class="SECT2">
<h2 class="SECT2"><a name="XMLSEC-EXAMPLE-SIGN3-RES">sign3-res.xml</a></h2>
<p></p>
<div class="INFORMALEXAMPLE">
<p></p>
<a name="AEN694"></a><pre class="PROGRAMLISTING">&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;!-- 
XML Security Library example: Signed XML doc file (sign3 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&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;SIaj/6KY3C1SmDXU2++Gm31U1xTadFp04WhBgfsJFbxrL+q7GKSKN9kfQ+UpN9+i
D5fWmuavXEHe4Gw6RMaMEkq2URQo7F68+d5J/ajq8/l4n+xE6/reGScVwT6L4dEP
XXVJcAi2ZnQ3O7GTNvNGCPibL9mUcyCWBFZ92Uemtc/vJFCQ7ZyKMdMfACgxOwyN
T/9971oog241/2doudhonc0I/3mgPYWkZdX6yvr62mEjnG+oUZkhWYJ4ewZJ4hM4
JjbFqZO+OEzDRSbw3DkmuBA/mtlx+3t13SESfEub5hqoMdVmtth/eTb64dsPdl9r
3k1ACVX9f8aHfQQdJOmLFQ==&lt;/SignatureValue&gt;
&lt;KeyInfo&gt;
&lt;X509Data&gt;
&lt;X509Certificate&gt;MIIE3zCCBEigAwIBAgIBBTANBgkqhkiG9w0BAQQFADCByzELMAkGA1UEBhMCVVMx
EzARBgNVBAgTCkNhbGlmb3JuaWExEjAQBgNVBAcTCVN1bm55dmFsZTE9MDsGA1UE
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MA0GCSqGSIb3DQEBBAUAA4GBALU/mzIxSv8vhDuomxFcplzwdlLZbvSQrfoNkMGY
1UoS3YJrN+jZLWKSyWE3mIaPpElqXiXQGGkwD5iPQ1iJMbI7BeLvx6ZxX/f+c8Wn
ss0uc1NxfahMaBoyG15IL4+beqO182fosaKJTrJNG3mc//ANGU9OsQM9mfBEt4oL
NJ2D&lt;/X509Certificate&gt;
&lt;/X509Data&gt;
&lt;/KeyInfo&gt;
&lt;/Signature&gt;&lt;/Envelope&gt;</pre>
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