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Preparation for xmlsec 1.3.5 (#821)
18 июл 2024, 22:13
18 июл 2024, 22:13d76b77b
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<title>Signing a document.: 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"></a>Signing a document.</h2></div></div></div>
<p>The typical signature process includes following steps:
	  </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem"><p>
		Prepare data for signature.
	    </p></li>
<li class="listitem"><p>
		Create or load signature template and select start
    		<a class="ulink" href="" target="_top">&lt;dsig:Signature/&gt;</a>
		node.
	    </p></li>
<li class="listitem"><p>
		Create signature context <a class="link" href="xmlsec-xmldsig.html#xmlSecDSigCtx" title="struct xmlSecDSigCtx">xmlSecDSigCtx</a>
		using <a class="link" href="xmlsec-xmldsig.html#xmlSecDSigCtxCreate" title="xmlSecDSigCtxCreate ()">xmlSecDSigCtxCreate</a> or
		<a class="link" href="xmlsec-xmldsig.html#xmlSecDSigCtxInitialize" title="xmlSecDSigCtxInitialize ()">xmlSecDSigCtxInitialize</a>
		functions.
	    </p></li>
<li class="listitem"><p>
		Load signature key in <a class="link" href="xmlsec-keysmngr.html#xmlSecKeysMngr" title="struct xmlSecKeysMngr">keys manager</a> 
		or generate a session key and set it in the signature context 
		(<em class="structfield"><code>signKey</code></em> member of 
		<a class="link" href="xmlsec-xmldsig.html#xmlSecDSigCtx" title="struct xmlSecDSigCtx">xmlSecDSigCtx</a> structure).
	    </p></li>
<li class="listitem"><p>
		Sign data by calling <a class="link" href="xmlsec-xmldsig.html#xmlSecDSigCtxSign" title="xmlSecDSigCtxSign ()">xmlSecDSigCtxSign</a> 
		function.
	    </p></li>
<li class="listitem"><p>
		Check returned value and consume signed data.
	    </p></li>
<li class="listitem"><p>
		Destroy signature context <a class="link" href="xmlsec-xmldsig.html#xmlSecDSigCtx" title="struct xmlSecDSigCtx">xmlSecDSigCtx</a>
		using <a class="link" href="xmlsec-xmldsig.html#xmlSecDSigCtxDestroy" title="xmlSecDSigCtxDestroy ()">xmlSecDSigCtxDestroy</a> or
		<a class="link" href="xmlsec-xmldsig.html#xmlSecDSigCtxFinalize" title="xmlSecDSigCtxFinalize ()">xmlSecDSigCtxFinalize</a>
		functions.
	    </p></li>
</ul></div>
<p>
	</p>
<p>
	     </p>
<div class="example">
<a name="id-1.2.6.3.3.1"></a><p class="title"><b>Example 10. Signing a template.</b></p>
<div class="example-contents">
<pre class="programlisting">
/** 
 * sign_file:
 * @tmpl_file:		the signature template file name.
 * @key_file:		the PEM private key file name.
 *
 * Signs the #tmpl_file using private key from #key_file.
 *
 * Returns 0 on success or a negative value if an error occurs.
 */
int 
sign_file(const char* tmpl_file, const char* key_file) {
    xmlDocPtr doc = NULL;
    xmlNodePtr node = NULL;
    xmlSecDSigCtxPtr dsigCtx = NULL;
    int res = -1;
    
    assert(tmpl_file);
    assert(key_file);

    /* load template */
    doc = xmlParseFile(tmpl_file);
    if ((doc == NULL) || (xmlDocGetRootElement(doc) == NULL)){
	fprintf(stderr, "Error: unable to parse file \"%s\"\n", tmpl_file);
	goto done;	
    }
    
    /* find start node */
    node = xmlSecFindNode(xmlDocGetRootElement(doc), xmlSecNodeSignature, xmlSecDSigNs);
    if(node == NULL) {
	fprintf(stderr, "Error: start node not found in \"%s\"\n", tmpl_file);
	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;
    }

    /* 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, node) &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><a class="link" href="xmlsec-examples-sign-template-file.html#xmlsec-example-sign1" title="sign1.c">Full program listing</a></p>
<p><a class="link" href="xmlsec-examples-sign-template-file.html#xmlsec-example-sign1-tmpl" title="sign1-tmpl.xml">Simple signature template file</a></p>
</div>
</div>
<p><br class="example-break">
	</p>
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