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<title>Signing data with X509 certificate.: XML Security Library Reference Manual</title>
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<div class="sect1">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="xmlsec-notes-sign-x509"></a>Signing data with X509 certificate.</h2></div></div></div>
<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>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem"><p>
<a class="link" href="xmlsec-openssl-app.html#xmlSecOpenSSLAppKeyCertLoad" title="xmlSecOpenSSLAppKeyCertLoad ()">xmlSecOpenSSLAppKeyCertLoad</a> - loads
certificate from a file and adds to the key;
</p></li>
<li class="listitem"><p>
<a class="link" href="xmlsec-openssl-app.html#xmlSecOpenSSLAppPkcs12Load" title="xmlSecOpenSSLAppPkcs12Load ()">xmlSecOpenSSLAppPkcs12Load</a> -
loads private key and all the certificates associated with it from a PKCS12 file;
</p></li>
<li class="listitem"><p>
<a class="link" href="xmlsec-keys.html#xmlSecKeyAdoptData" title="xmlSecKeyAdoptData ()">xmlSecKeyAdoptData</a> - low level
function to add key data (including X509 key data) to the key.
</p></li>
</ul></div>
<p>
</p>
<div class="example">
<a name="id-1.2.11.3.2.2"></a><p class="title"><b>Example 20. Loading private key and X509 certificate.</b></p>
<div class="example-contents">
<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) < 0) {
fprintf(stderr,"Error: failed to load pem certificate \"%s\"\n", cert_file);
goto done;
}
</pre>
<p><a class="link" href="xmlsec-examples-sign-x509.html#xmlsec-example-sign3" title="sign3.c">Full program listing</a></p>
</div>
</div>
<p><br class="example-break">
</p>
<p>Next step is to prepare signature template with <dsig:X509Data/>
child of the <dsig:KeyInfo/> element. When XML Security Library finds
this node in the template, it automaticaly creates <dsig:X509Certificate/>
children of the <dsig:X509Data/> element and writes to result XML document
all the certificates associated with the signature key.
</p>
<div class="example">
<a name="id-1.2.11.3.3.1"></a><p class="title"><b>Example 21. Dynamicaly creating a signature template for signing document using X509 certificate.</b></p>
<div class="example-contents">
<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 <dsig:Signature/> 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 <dsig:KeyInfo/> and <dsig:X509Data/> */
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 class="link" href="xmlsec-examples-sign-x509.html#xmlsec-example-sign3" title="sign3.c">Full program listing</a></p>
</div>
</div>
<p><br class="example-break">
</p>
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