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+<title>Verifing document signed with X509 certificates.</title>
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+<br clear="all"><div class="SECT1">
+<h1 class="SECT1"><a name="XMLSEC-NOTES-VERIFY-X509">Verifing document signed with X509 certificates.</a></h1>
+<p> If the document is signed with an X509 certificate then the signature
+ verification consist of two steps:
+ </p>
+<p></p>
+<ul>
+<li><p>Creating and verifing X509 certificates chain.
+ </p></li>
+<li><p>Verifing signature itself using key exrtacted from
+ a certificate verified on previous step.
+ </p></li>
+</ul>
+ Certificates chain is constructed from certificates in a way that
+ each certificate in the chain is signed with previous one:
+ <div class="FIGURE">
+<a name="AEN442"></a><p><b>Figure 1. Certificates chain.</b></p>
+<pre class="PROGRAMLISTING">Certificate A (signed with B) &lt;- Certificate B (signed with C) &lt;- ... &lt;- Root Certificate (signed by itself)
+ </pre>
+</div>
+ At the end of the chain there is a "Root Certificate" which
+ is signed by itself. There is no way to verify the validity of the
+ root certificate and application have to "trust" it
+ (another name for root certificates is "trusted" certificates).
+ <p> Application can use <a href="xmlsec-app.html#XMLSECCRYPTOAPPKEYSMNGRCERTLOAD">xmlSecCryptoAppKeysMngrCertLoad</a>
+ function to load both "trusted" and "un-trusted"
+ certificates. However, the selection of "trusted"
+ certificates is very sensitive process and this function might be
+ not implemented for some crypto engines. In this case, the
+ "trusted" certificates list is loaded during initialization
+ or specified in crypto engine configuration files.
+ Check XML Security Library API reference for more details.
+ </p>
+<div class="EXAMPLE">
+<a name="AEN447"></a><p><b>Example 3. Loading trusted X509 certificate.</b></p>
+<pre class="PROGRAMLISTING">/**
+ * load_trusted_certs:
+ * @files: the list of filenames.
+ * @files_size: the number of filenames in #files.
+ *
+ * Creates simple keys manager and load trusted certificates from PEM #files.
+ * The caller is responsible for destroing returned keys manager using
+ * @xmlSecKeysMngrDestroy.
+ *
+ * Returns the pointer to newly created keys manager or NULL if an error
+ * occurs.
+ */
+xmlSecKeysMngrPtr
+load_trusted_certs(char** files, int files_size) {
+ xmlSecKeysMngrPtr mngr;
+ int i;
+
+ assert(files);
+ assert(files_size &gt; 0);
+
+ /* create and initialize keys manager, we use a simple list based
+ * keys manager, implement your own xmlSecKeysStore klass if you need
+ * something more sophisticated
+ */
+ mngr = xmlSecKeysMngrCreate();
+ if(mngr == NULL) {
+ fprintf(stderr, "Error: failed to create keys manager.\n");
+ return(NULL);
+ }
+ if(xmlSecCryptoAppDefaultKeysMngrInit(mngr) &lt; 0) {
+ fprintf(stderr, "Error: failed to initialize keys manager.\n");
+ xmlSecKeysMngrDestroy(mngr);
+ return(NULL);
+ }
+
+ for(i = 0; i &lt; files_size; ++i) {
+ assert(files[i]);
+
+ /* load trusted cert */
+ if(xmlSecCryptoAppKeysMngrCertLoad(mngr, files[i], xmlSecKeyDataFormatPem, xmlSecKeyDataTypeTrusted) &lt; 0) {
+ fprintf(stderr,"Error: failed to load pem certificate from \"%s\"\n", files[i]);
+ xmlSecKeysMngrDestroy(mngr);
+ return(NULL);
+ }
+ }
+
+ return(mngr);
+}
+ </pre>
+<p><a href="xmlsec-verify-with-x509.html#XMLSEC-EXAMPLE-VERIFY3">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-sign-x509.html"><b>&lt;&lt;&lt; Signing data with X509 certificate.</b></a></td>
+<td align="right"><a accesskey="n" href="xmlsec-notes-transforms.html"><b>Transforms and transforms chain. &gt;&gt;&gt;</b></a></td>
+</tr></table>
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