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+<html>
+<head>
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+<title>Decrypting an encrypted document</title>
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+<br clear="all"><div class="SECT1">
+<h1 class="SECT1"><a name="XMLSEC-NOTES-DECRYPT">Decrypting an encrypted document</a></h1>
+<p>The typical decryption process includes following steps:
+ </p>
+<p></p>
+<ul>
+<li><p> Load keys, X509 certificates, etc. in the <a href="xmlsec-keysmngr.html#XMLSECKEYSMNGR">keys manager</a> .
+ </p></li>
+<li><p> Create encryption context <a href="xmlsec-xmlenc.html#XMLSECENCCTX">xmlSecEncCtx</a>
+ using <a href="xmlsec-xmlenc.html#XMLSECENCCTXCREATE">xmlSecEncCtxCreate</a> or
+ <a href="xmlsec-xmlenc.html#XMLSECENCCTXINITIALIZE">xmlSecEncCtxInitialize</a>
+ functions.
+ </p></li>
+<li><p> Select start decryption &lt;enc:EncryptedData&gt; node.
+ </p></li>
+<li><p> Decrypt by calling <a href="xmlsec-xmlenc.html#XMLSECENCCTXDECRYPT">xmlSecencCtxDecrypt</a>
+ function.
+ </p></li>
+<li><p> Check returned value and if necessary consume encrypted data.
+ </p></li>
+<li><p> Destroy encryption context <a href="xmlsec-xmlenc.html#XMLSECENCCTX">xmlSecEncCtx</a>
+ using <a href="xmlsec-xmlenc.html#XMLSECENCCTXDESTROY">xmlSecEncCtxDestroy</a> or
+ <a href="xmlsec-xmlenc.html#XMLSECENCCTXFINALIZE">xmlSecEncCtxFinalize</a>
+ functions.
+ </p></li>
+</ul>
+<p> </p>
+<div class="EXAMPLE">
+<a name="AEN333"></a><p><b>Example 2. Decrypting a document.</b></p>
+<pre class="PROGRAMLISTING">int
+decrypt_file(const char* enc_file, const char* key_file) {
+ xmlDocPtr doc = NULL;
+ xmlNodePtr node = NULL;
+ xmlSecEncCtxPtr encCtx = NULL;
+ int res = -1;
+
+ assert(enc_file);
+ assert(key_file);
+
+ /* load template */
+ doc = xmlParseFile(enc_file);
+ if ((doc == NULL) || (xmlDocGetRootElement(doc) == NULL)){
+ fprintf(stderr, "Error: unable to parse file \"%s\"\n", enc_file);
+ goto done;
+ }
+
+ /* find start node */
+ node = xmlSecFindNode(xmlDocGetRootElement(doc), xmlSecNodeEncryptedData, xmlSecEncNs);
+ if(node == NULL) {
+ fprintf(stderr, "Error: start node not found in \"%s\"\n", enc_file);
+ goto done;
+ }
+
+ /* create encryption context, we don't need keys manager in this example */
+ encCtx = xmlSecEncCtxCreate(NULL);
+ if(encCtx == NULL) {
+ fprintf(stderr,"Error: failed to create encryption context\n");
+ goto done;
+ }
+
+ /* load DES key */
+ encCtx-&gt;encKey = xmlSecKeyReadBinaryFile(xmlSecKeyDataDesId, key_file);
+ if(encCtx-&gt;encKey == NULL) {
+ fprintf(stderr,"Error: failed to load des key from binary file \"%s\"\n", key_file);
+ goto done;
+ }
+
+ /* set key name to the file name, this is just an example! */
+ if(xmlSecKeySetName(encCtx-&gt;encKey, key_file) &lt; 0) {
+ fprintf(stderr,"Error: failed to set key name for key from \"%s\"\n", key_file);
+ goto done;
+ }
+
+ /* decrypt the data */
+ if((xmlSecEncCtxDecrypt(encCtx, node) &lt; 0) || (encCtx-&gt;result == NULL)) {
+ fprintf(stderr,"Error: decryption failed\n");
+ goto done;
+ }
+
+ /* print decrypted data to stdout */
+ if(encCtx-&gt;resultReplaced != 0) {
+ fprintf(stdout, "Decrypted XML data:\n");
+ xmlDocDump(stdout, doc);
+ } else {
+ fprintf(stdout, "Decrypted binary data (%d bytes):\n", xmlSecBufferGetSize(encCtx-&gt;result));
+ if(xmlSecBufferGetData(encCtx-&gt;result) != NULL) {
+ fwrite(xmlSecBufferGetData(encCtx-&gt;result),
+ 1,
+ xmlSecBufferGetSize(encCtx-&gt;result),
+ stdout);
+ }
+ }
+ fprintf(stdout, "\n");
+
+ /* success */
+ res = 0;
+
+done:
+ /* cleanup */
+ if(encCtx != NULL) {
+ xmlSecEncCtxDestroy(encCtx);
+ }
+
+ if(doc != NULL) {
+ xmlFreeDoc(doc);
+ }
+ return(res);
+}
+ </pre>
+<p><a href="xmlsec-decrypt-with-signle-key.html#XMLSEC-EXAMPLE-DECRYPT1">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-verify.html"><b>&lt;&lt;&lt; Verifying a signed document</b></a></td>
+<td align="right"><a accesskey="n" href="xmlsec-notes-keys.html"><b>Keys. &gt;&gt;&gt;</b></a></td>
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