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<br clear="all"><div class="SECT1">
<h1 class="SECT1"><a name="XMLSEC-DECRYPT-WITH-KEYS-MNGR">Decrypting data with keys manager.</a></h1>
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<h2 class="SECT2"><a name="XMLSEC-EXAMPLE-DECRYPT2">decrypt2.c</a></h2>
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<a name="AEN807"></a><pre class="PROGRAMLISTING">/** 
 * XML Security Library example: Decrypting an encrypted file using keys manager.
 * 
 * Decrypts encrypted XML file using keys manager and a list of 
 * DES key from a binary file
 * 
 * Usage: 
 *      ./decrypt2 &lt;xml-enc&gt; &lt;des-key-file1&gt; [&lt;des-key-file2&gt; [...]] 
 *
 * Example:
 *      ./decrypt2 encrypt1-res.xml deskey.bin
 *      ./decrypt2 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;

xmlSecKeysMngrPtr load_des_keys(char** files, int files_size);
int decrypt_file(xmlSecKeysMngrPtr mngr, const char* enc_file);

int 
main(int argc, char **argv) {
    xmlSecKeysMngrPtr mngr;
#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-file1&gt; [&lt;key-file2&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);
    }

    /* create keys manager and load keys */
    mngr = load_des_keys(&amp;(argv[2]), argc - 2);
    if(mngr == NULL) {
        return(-1);
    }

    if(decrypt_file(mngr, argv[1]) &lt; 0) {
        xmlSecKeysMngrDestroy(mngr);    
        return(-1);
    }    

    /* destroy keys manager */
    xmlSecKeysMngrDestroy(mngr);
    
    /* Shutdown xmlsec-crypto library */
    xmlSecCryptoShutdown();
    
    /* Shutdown crypto library */
    xmlSecCryptoAppShutdown();
    
    /* Shutdown xmlsec library */
    xmlSecShutdown();

    /* Shutdown libxslt/libxml */
#ifndef XMLSEC_NO_XSLT
    xsltFreeSecurityPrefs(xsltSecPrefs);
    xsltCleanupGlobals();            
#endif /* XMLSEC_NO_XSLT */
    xmlCleanupParser();
    
    return(0);
}

/**
 * load_des_keys:
 * @files:              the list of filenames.
 * @files_size:         the number of filenames in #files.
 *
 * Creates simple keys manager and load DES keys from #files in it.
 * 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_des_keys(char** files, int files_size) {
    xmlSecKeysMngrPtr mngr;
    xmlSecKeyPtr key;
    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 DES key */
        key = xmlSecKeyReadBinaryFile(xmlSecKeyDataDesId, files[i]);
        if(key == NULL) {
            fprintf(stderr,"Error: failed to load des key from binary file \"%s\"\n", files[i]);
            xmlSecKeysMngrDestroy(mngr);
            return(NULL);
        }

        /* set key name to the file name, this is just an example! */
        if(xmlSecKeySetName(key, BAD_CAST files[i]) &lt; 0) {
            fprintf(stderr,"Error: failed to set key name for key from \"%s\"\n", files[i]);
            xmlSecKeyDestroy(key);
            xmlSecKeysMngrDestroy(mngr);
            return(NULL);
        }
        
        /* add key to keys manager, from now on keys manager is responsible 
         * for destroying key 
         */
        if(xmlSecCryptoAppDefaultKeysMngrAdoptKey(mngr, key) &lt; 0) {
            fprintf(stderr,"Error: failed to add key from \"%s\" to keys manager\n", files[i]);
            xmlSecKeyDestroy(key);
            xmlSecKeysMngrDestroy(mngr);
            return(NULL);
        }
    }

    return(mngr);
}

/**
 * decrypt_file:
 * @mngr:               the pointer to keys manager.
 * @enc_file:           the encrypted XML  file name.
 *
 * 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(xmlSecKeysMngrPtr mngr, const char* enc_file) {
    xmlDocPtr doc = NULL;
    xmlNodePtr node = NULL;
    xmlSecEncCtxPtr encCtx = NULL;
    int res = -1;
    
    assert(mngr);
    assert(enc_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 */
    encCtx = xmlSecEncCtxCreate(mngr);
    if(encCtx == NULL) {
        fprintf(stderr,"Error: failed to create encryption context\n");
        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>
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