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<title>Encrypting data with a dynamicaly created template.: 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-encrypt-dynamic-template"></a>Encrypting data with a dynamicaly created template.</h2></div></div></div>
<div class="sect2">
<div class="titlepage"><div><div><h3 class="title">
<a name="xmlsec-example-encrypt2"></a>encrypt2.c</h3></div></div></div>
<div class="informalexample"><pre class="programlisting">
/**
 * XML Security Library example: Encrypting XML file with a dynamicaly created template.
 *
 * Encrypts XML file using a dynamicaly created template file and a DES key
 * from a binary file
 *
 * Usage:
 *      ./encrypt2 &lt;xml-doc&gt; &lt;des-key-file&gt;
 *
 * Example:
 *      ./encrypt2 encrypt2-doc.xml deskey.bin &gt; encrypt2-res.xml
 *
 * The result could be decrypted with decrypt1 example:
 *      ./decrypt1 encrypt2-res.xml deskey.bin
 *
 * This is free software; see Copyright file in the source
 * distribution for preciese wording.
 *
 * Copyright (C) 2002-2024 Aleksey Sanin &lt;aleksey@aleksey.com&gt;. All Rights Reserved.
 */
#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/templates.h&gt;
#include &lt;xmlsec/crypto.h&gt;

int encrypt_file(const char* xml_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;xml-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);

    /* 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(NULL) &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 and/or LTDL_LIBRARY_PATH) environment variables.\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(encrypt_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
    xsltFreeSecurityPrefs(xsltSecPrefs);
    xsltCleanupGlobals();
#endif /* XMLSEC_NO_XSLT */
    xmlCleanupParser();

    return(0);
}

/**
 * encrypt_file:
 * @xml_file:           the encryption template file name.
 * @key_file:           the Triple DES key file.
 *
 * Encrypts #xml_file using a dynamicaly created template and DES key from
 * #key_file.
 *
 * Returns 0 on success or a negative value if an error occurs.
 */
int
encrypt_file(const char* xml_file, const char* key_file) {
    xmlDocPtr doc = NULL;
    xmlNodePtr encDataNode = NULL;
    xmlNodePtr keyInfoNode = NULL;
    xmlSecEncCtxPtr encCtx = NULL;
    int res = -1;

    assert(xml_file);
    assert(key_file);

    /* load template */
    doc = xmlReadFile(xml_file, NULL, XML_PARSE_PEDANTIC | XML_PARSE_NONET);
    if ((doc == NULL) || (xmlDocGetRootElement(doc) == NULL)){
        fprintf(stderr, "Error: unable to parse file \"%s\"\n", xml_file);
        goto done;
    }

    /* create encryption template to encrypt XML file and replace
     * its content with encryption result */
    encDataNode = xmlSecTmplEncDataCreate(doc, xmlSecTransformDes3CbcId,
                                NULL, xmlSecTypeEncElement, NULL, NULL);
    if(encDataNode == NULL) {
        fprintf(stderr, "Error: failed to create encryption template\n");
        goto done;
    }

    /* we want to put encrypted data in the &lt;enc:CipherValue/&gt; node */
    if(xmlSecTmplEncDataEnsureCipherValue(encDataNode) == NULL) {
        fprintf(stderr, "Error: failed to add CipherValue node\n");
        goto done;
    }

    /* add &lt;dsig:KeyInfo/&gt; and &lt;dsig:KeyName/&gt; nodes to put key name in the signed document */
    keyInfoNode = xmlSecTmplEncDataEnsureKeyInfo(encDataNode, NULL);
    if(keyInfoNode == NULL) {
        fprintf(stderr, "Error: failed to add key info\n");
        goto done;
    }

    if(xmlSecTmplKeyInfoAddKeyName(keyInfoNode, NULL) == NULL) {
        fprintf(stderr, "Error: failed to add key name\n");
        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, assuming that there is not password */
    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, BAD_CAST key_file) &lt; 0) {
        fprintf(stderr,"Error: failed to set key name for key from \"%s\"\n", key_file);
        goto done;
    }

    /* encrypt the data */
    if(xmlSecEncCtxXmlEncrypt(encCtx, encDataNode, xmlDocGetRootElement(doc)) &lt; 0) {
        fprintf(stderr,"Error: encryption failed\n");
        goto done;
    }

    /* we template is inserted in the doc */
    encDataNode = NULL;

    /* print encrypted data with document to stdout */
    xmlDocDump(stdout, doc);

    /* success */
    res = 0;

done:

    /* cleanup */
    if(encCtx != NULL) {
        xmlSecEncCtxDestroy(encCtx);
    }

    if(encDataNode != NULL) {
        xmlFreeNode(encDataNode);
    }

    if(doc != NULL) {
        xmlFreeDoc(doc);
    }
    return(res);
}

</pre></div>
</div>
<div class="sect2">
<div class="titlepage"><div><div><h3 class="title">
<a name="xmlsec-example-encrypt2-doc"></a>encrypt2-doc.xml</h3></div></div></div>
<div class="informalexample"><pre class="programlisting">
&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;!-- 
XML Security Library example: Original XML doc file before encryption (encrypt2 example). 
--&gt;
&lt;Envelope xmlns="urn:envelope"&gt;
  &lt;Data&gt;
	Hello, World!
  &lt;/Data&gt;
&lt;/Envelope&gt;
</pre></div>
</div>
<div class="sect2">
<div class="titlepage"><div><div><h3 class="title">
<a name="xmlsec-example-encrypt2-res"></a>encrypt2-res.xml</h3></div></div></div>
<div class="informalexample"><pre class="programlisting">
&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;!-- 
XML Security Library example: Encrypted XML file (encrypt2 example). 
--&gt;
&lt;EncryptedData xmlns="http://www.w3.org/2001/04/xmlenc#" Type="http://www.w3.org/2001/04/xmlenc#Element"&gt;
&lt;EncryptionMethod Algorithm="http://www.w3.org/2001/04/xmlenc#tripledes-cbc"/&gt;
&lt;KeyInfo xmlns="http://www.w3.org/2000/09/xmldsig#"&gt;
&lt;KeyName&gt;deskey.bin&lt;/KeyName&gt;
&lt;/KeyInfo&gt;
&lt;CipherData&gt;
&lt;CipherValue&gt;WXlDyktaADlUe+PywKwS3KdKlahCteEKxi/hRlHcXNQlGwNGrYKy8aQ6dLtX1bKg
IgL/XoAQN3B27zD91b1ZLGh6QQ9CjnVD98+hYJ9TPp4piPnII4vGUA==&lt;/CipherValue&gt;
&lt;/CipherData&gt;
&lt;/EncryptedData&gt;
</pre></div>
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