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+<br clear="all"><div class="SECT1">
+<h1 class="SECT1"><a name="XMLSEC-DECRYPT-WITH-SIGNLE-KEY">Decrypting data with a single key.</a></h1>
+<br clear="all"><div class="SECT2">
+<h2 class="SECT2"><a name="XMLSEC-EXAMPLE-DECRYPT1">decrypt1.c</a></h2>
+<p></p>
+<div class="INFORMALEXAMPLE">
+<p></p>
+<a name="AEN800"></a><pre class="PROGRAMLISTING">/**
+ * XML Security Library example: Decrypting an encrypted file using a single key.
+ *
+ * Decrypts encrypted XML file using a single DES key from a binary file
+ *
+ * Usage:
+ * ./decrypt1 &lt;xml-enc&gt; &lt;des-key-file&gt;
+ *
+ * Example:
+ * ./decrypt1 encrypt1-res.xml deskey.bin
+ * ./decrypt1 encrypt2-res.xml deskey.bin
+ *
+ * This is free software; see Copyright file in the source
+ * distribution for preciese wording.
+ *
+ * Copyright (C) 2002-2003 Aleksey Sanin &lt;aleksey@aleksey.com&gt;
+ */
+#include &lt;stdlib.h&gt;
+#include &lt;string.h&gt;
+#include &lt;assert.h&gt;
+
+#include &lt;libxml/tree.h&gt;
+#include &lt;libxml/xmlmemory.h&gt;
+#include &lt;libxml/parser.h&gt;
+
+#ifndef XMLSEC_NO_XSLT
+#include &lt;libxslt/xslt.h&gt;
+#include &lt;libxslt/security.h&gt;
+#endif /* XMLSEC_NO_XSLT */
+
+#include &lt;xmlsec/xmlsec.h&gt;
+#include &lt;xmlsec/xmltree.h&gt;
+#include &lt;xmlsec/xmlenc.h&gt;
+#include &lt;xmlsec/crypto.h&gt;
+
+int decrypt_file(const char* enc_file, const char* key_file);
+
+int
+main(int argc, char **argv) {
+#ifndef XMLSEC_NO_XSLT
+ xsltSecurityPrefsPtr xsltSecPrefs = NULL;
+#endif /* XMLSEC_NO_XSLT */
+
+ assert(argv);
+
+ if(argc != 3) {
+ fprintf(stderr, "Error: wrong number of arguments.\n");
+ fprintf(stderr, "Usage: %s &lt;enc-file&gt; &lt;key-file&gt;\n", argv[0]);
+ return(1);
+ }
+
+ /* Init libxml and libxslt libraries */
+ xmlInitParser();
+ LIBXML_TEST_VERSION
+ xmlLoadExtDtdDefaultValue = XML_DETECT_IDS | XML_COMPLETE_ATTRS;
+ xmlSubstituteEntitiesDefault(1);
+#ifndef XMLSEC_NO_XSLT
+ xmlIndentTreeOutput = 1;
+#endif /* XMLSEC_NO_XSLT */
+
+ /* Init libxslt */
+#ifndef XMLSEC_NO_XSLT
+ /* disable everything */
+ xsltSecPrefs = xsltNewSecurityPrefs();
+ xsltSetSecurityPrefs(xsltSecPrefs, XSLT_SECPREF_READ_FILE, xsltSecurityForbid);
+ xsltSetSecurityPrefs(xsltSecPrefs, XSLT_SECPREF_WRITE_FILE, xsltSecurityForbid);
+ xsltSetSecurityPrefs(xsltSecPrefs, XSLT_SECPREF_CREATE_DIRECTORY, xsltSecurityForbid);
+ xsltSetSecurityPrefs(xsltSecPrefs, XSLT_SECPREF_READ_NETWORK, xsltSecurityForbid);
+ xsltSetSecurityPrefs(xsltSecPrefs, XSLT_SECPREF_WRITE_NETWORK, xsltSecurityForbid);
+ xsltSetDefaultSecurityPrefs(xsltSecPrefs);
+#endif /* XMLSEC_NO_XSLT */
+
+
+ /* Init xmlsec library */
+ if(xmlSecInit() &lt; 0) {
+ fprintf(stderr, "Error: xmlsec initialization failed.\n");
+ return(-1);
+ }
+
+ /* Check loaded library version */
+ if(xmlSecCheckVersion() != 1) {
+ fprintf(stderr, "Error: loaded xmlsec library version is not compatible.\n");
+ return(-1);
+ }
+
+ /* Load default crypto engine if we are supporting dynamic
+ * loading for xmlsec-crypto libraries. Use the crypto library
+ * name ("openssl", "nss", etc.) to load corresponding
+ * xmlsec-crypto library.
+ */
+#ifdef XMLSEC_CRYPTO_DYNAMIC_LOADING
+ if(xmlSecCryptoDLLoadLibrary(BAD_CAST XMLSEC_CRYPTO) &lt; 0) {
+ fprintf(stderr, "Error: unable to load default xmlsec-crypto library. Make sure\n"
+ "that you have it installed and check shared libraries path\n"
+ "(LD_LIBRARY_PATH) envornment variable.\n");
+ return(-1);
+ }
+#endif /* XMLSEC_CRYPTO_DYNAMIC_LOADING */
+
+ /* Init crypto library */
+ if(xmlSecCryptoAppInit(NULL) &lt; 0) {
+ fprintf(stderr, "Error: crypto initialization failed.\n");
+ return(-1);
+ }
+
+ /* Init xmlsec-crypto library */
+ if(xmlSecCryptoInit() &lt; 0) {
+ fprintf(stderr, "Error: xmlsec-crypto initialization failed.\n");
+ return(-1);
+ }
+
+ if(decrypt_file(argv[1], argv[2]) &lt; 0) {
+ return(-1);
+ }
+
+ /* Shutdown xmlsec-crypto library */
+ xmlSecCryptoShutdown();
+
+ /* Shutdown crypto library */
+ xmlSecCryptoAppShutdown();
+
+ /* Shutdown xmlsec library */
+ xmlSecShutdown();
+
+ /* Shutdown libxslt/libxml */
+#ifndef XMLSEC_NO_XSLT
+ xsltCleanupGlobals();
+#endif /* XMLSEC_NO_XSLT */
+ xmlCleanupParser();
+
+ return(0);
+}
+
+/**
+ * decrypt_file:
+ * @enc_file: the encrypted XML file name.
+ * @key_file: the Triple DES key file.
+ *
+ * Decrypts the XML file #enc_file using DES key from #key_file and
+ * prints results to stdout.
+ *
+ * Returns 0 on success or a negative value if an error occurs.
+ */
+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></p>
+</div>
+</div>
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+<table class="navigation" width="100%" summary="Navigation footer" cellpadding="2" cellspacing="2"><tr valign="middle">
+<td align="left"><a accesskey="p" href="xmlsec-encrypt-with-session-key.html"><b>&lt;&lt;&lt; Encrypting data with a session key.</b></a></td>
+<td align="right"><a accesskey="n" href="xmlsec-decrypt-with-keys-mngr.html"><b>Decrypting data with keys manager. &gt;&gt;&gt;</b></a></td>
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