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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Signing data with X509 certificate.</title>
<meta name="GENERATOR" content="Modular DocBook HTML Stylesheet Version 1.79">
<link rel="HOME" title="XML Security Library Reference Manual" href="index.html">
<link rel="UP" title="Using X509 Certificates." href="xmlsec-notes-x509.html">
<link rel="PREVIOUS" title="Using X509 Certificates." href="xmlsec-notes-x509.html">
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<br clear="all"><div class="SECT1">
<h1 class="SECT1"><a name="XMLSEC-NOTES-SIGN-X509">Signing data with X509 certificate.</a></h1>
<p>To sign a file using X509 certificate, 
	an application need to associate the certificate (or certificates) 
	with the private key using one of the following functions:
	</p>
<p></p>
<ul>
<li><p>	    <a href="xmlsec-openssl-app.html#XMLSECOPENSSLAPPKEYCERTLOAD">xmlSecOpenSSLAppKeyCertLoad</a> - loads
	    certificate from a file and adds to the key;
	    </p></li>
<li><p>	    <a href="xmlsec-openssl-app.html#XMLSECOPENSSLAPPPKCS12LOAD">xmlSecOpenSSLAppPkcs12Load</a> -
	    loads private key and all the certificates associated with it from a PKCS12 file;
	    </p></li>
<li><p>	    <a href="xmlsec-keys.html#XMLSECKEYADOPTDATA">xmlSecKeyAdoptData</a> - low level
	    function to add key data (including X509 key data) to the key.
	    </p></li>
</ul>
<div class="EXAMPLE">
<a name="AEN423"></a><p><b>Example 1. Loading private key and X509 certificate.</b></p>
<pre class="PROGRAMLISTING">    /* load private key, assuming that there is not password */
    key = xmlSecCryptoAppKeyLoad(key_file, xmlSecKeyDataFormatPem, NULL, NULL, NULL);
    if(key == 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(key, cert_file, xmlSecKeyDataFormatPem) &lt; 0) {
        fprintf(stderr,"Error: failed to load pem certificate \"%s\"\n", cert_file);
	goto done;
    }
	    </pre>
<p><a href="xmlsec-examples-sign-x509.html#XMLSEC-EXAMPLE-SIGN3">Full program listing</a></p>
</div>
	<p>Next step is to prepare signature template with &lt;dsig:X509Data/&gt;
	child of the &lt;dsig:KeyInfo/&gt; element. When XML Security Library finds
	this node in the template, it automaticaly creates &lt;dsig:X509Certificate/&gt; 
	children of the &lt;dsig:X509Data/&gt; element and writes to result XML document
	all the certificates associated with the signature key. 
	</p>
<div class="EXAMPLE">
<a name="AEN429"></a><p><b>Example 2. Dynamicaly creating a signature template for signing document using X509 certificate.</b></p>
<pre class="PROGRAMLISTING">    /* 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;		
    }
	    </pre>
<p><a href="xmlsec-examples-sign-x509.html#XMLSEC-EXAMPLE-SIGN3">Full program listing</a></p>
</div>
	</div>
<table class="navigation" width="100%" summary="Navigation footer" cellpadding="2" cellspacing="2"><tr valign="middle">
<td align="left"><a accesskey="p" href="xmlsec-notes-x509.html"><b>&lt;&lt;&lt; Using X509 Certificates.</b></a></td>
<td align="right"><a accesskey="n" href="xmlsec-notes-verify-x509.html"><b>Verifing document signed with X509 certificates. &gt;&gt;&gt;</b></a></td>
</tr></table>
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