forked from openkylin/xmlsec1
315 lines
11 KiB
HTML
315 lines
11 KiB
HTML
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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">
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
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<a name="xmlsec-encrypt-dynamic-template"></a>Encrypting data with a dynamicaly created template.</h2></div></div></div>
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<div class="sect2">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="xmlsec-example-encrypt2"></a>encrypt2.c</h3></div></div></div>
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<div class="informalexample"><pre class="programlisting">
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/**
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* XML Security Library example: Encrypting XML file with a dynamicaly created template.
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*
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* Encrypts XML file using a dynamicaly created template file and a DES key
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* from a binary file
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*
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* Usage:
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* ./encrypt2 <xml-doc> <des-key-file>
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*
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* Example:
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* ./encrypt2 encrypt2-doc.xml deskey.bin > encrypt2-res.xml
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*
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* The result could be decrypted with decrypt1 example:
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* ./decrypt1 encrypt2-res.xml deskey.bin
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*
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* This is free software; see Copyright file in the source
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* distribution for preciese wording.
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*
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* Copyright (C) 2002-2016 Aleksey Sanin <aleksey@aleksey.com>. All Rights Reserved.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include <libxml/tree.h>
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#include <libxml/xmlmemory.h>
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#include <libxml/parser.h>
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#ifndef XMLSEC_NO_XSLT
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#include <libxslt/xslt.h>
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#include <libxslt/security.h>
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#endif /* XMLSEC_NO_XSLT */
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#include <xmlsec/xmlsec.h>
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#include <xmlsec/xmltree.h>
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#include <xmlsec/xmlenc.h>
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#include <xmlsec/templates.h>
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#include <xmlsec/crypto.h>
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int encrypt_file(const char* xml_file, const char* key_file);
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int
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main(int argc, char **argv) {
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#ifndef XMLSEC_NO_XSLT
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xsltSecurityPrefsPtr xsltSecPrefs = NULL;
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#endif /* XMLSEC_NO_XSLT */
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assert(argv);
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if(argc != 3) {
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fprintf(stderr, "Error: wrong number of arguments.\n");
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fprintf(stderr, "Usage: %s <xml-file> <key-file>\n", argv[0]);
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return(1);
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}
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/* Init libxml and libxslt libraries */
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xmlInitParser();
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LIBXML_TEST_VERSION
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xmlLoadExtDtdDefaultValue = XML_DETECT_IDS | XML_COMPLETE_ATTRS;
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xmlSubstituteEntitiesDefault(1);
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#ifndef XMLSEC_NO_XSLT
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xmlIndentTreeOutput = 1;
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#endif /* XMLSEC_NO_XSLT */
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/* Init libxslt */
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#ifndef XMLSEC_NO_XSLT
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/* disable everything */
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xsltSecPrefs = xsltNewSecurityPrefs();
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xsltSetSecurityPrefs(xsltSecPrefs, XSLT_SECPREF_READ_FILE, xsltSecurityForbid);
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xsltSetSecurityPrefs(xsltSecPrefs, XSLT_SECPREF_WRITE_FILE, xsltSecurityForbid);
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xsltSetSecurityPrefs(xsltSecPrefs, XSLT_SECPREF_CREATE_DIRECTORY, xsltSecurityForbid);
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xsltSetSecurityPrefs(xsltSecPrefs, XSLT_SECPREF_READ_NETWORK, xsltSecurityForbid);
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xsltSetSecurityPrefs(xsltSecPrefs, XSLT_SECPREF_WRITE_NETWORK, xsltSecurityForbid);
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xsltSetDefaultSecurityPrefs(xsltSecPrefs);
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#endif /* XMLSEC_NO_XSLT */
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/* Init xmlsec library */
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if(xmlSecInit() < 0) {
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fprintf(stderr, "Error: xmlsec initialization failed.\n");
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return(-1);
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}
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/* Check loaded library version */
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if(xmlSecCheckVersion() != 1) {
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fprintf(stderr, "Error: loaded xmlsec library version is not compatible.\n");
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return(-1);
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}
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/* Load default crypto engine if we are supporting dynamic
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* loading for xmlsec-crypto libraries. Use the crypto library
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* name ("openssl", "nss", etc.) to load corresponding
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* xmlsec-crypto library.
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*/
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#ifdef XMLSEC_CRYPTO_DYNAMIC_LOADING
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if(xmlSecCryptoDLLoadLibrary(NULL) < 0) {
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fprintf(stderr, "Error: unable to load default xmlsec-crypto library. Make sure\n"
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"that you have it installed and check shared libraries path\n"
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"(LD_LIBRARY_PATH and/or LTDL_LIBRARY_PATH) environment variables.\n");
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return(-1);
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}
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#endif /* XMLSEC_CRYPTO_DYNAMIC_LOADING */
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/* Init crypto library */
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if(xmlSecCryptoAppInit(NULL) < 0) {
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fprintf(stderr, "Error: crypto initialization failed.\n");
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return(-1);
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}
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/* Init xmlsec-crypto library */
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if(xmlSecCryptoInit() < 0) {
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fprintf(stderr, "Error: xmlsec-crypto initialization failed.\n");
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return(-1);
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}
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if(encrypt_file(argv[1], argv[2]) < 0) {
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return(-1);
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}
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/* Shutdown xmlsec-crypto library */
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xmlSecCryptoShutdown();
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/* Shutdown crypto library */
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xmlSecCryptoAppShutdown();
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/* Shutdown xmlsec library */
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xmlSecShutdown();
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/* Shutdown libxslt/libxml */
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#ifndef XMLSEC_NO_XSLT
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xsltFreeSecurityPrefs(xsltSecPrefs);
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xsltCleanupGlobals();
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#endif /* XMLSEC_NO_XSLT */
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xmlCleanupParser();
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return(0);
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}
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/**
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* encrypt_file:
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* @xml_file: the encryption template file name.
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* @key_file: the Triple DES key file.
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*
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* Encrypts #xml_file using a dynamicaly created template and DES key from
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* #key_file.
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*
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* Returns 0 on success or a negative value if an error occurs.
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*/
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int
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encrypt_file(const char* xml_file, const char* key_file) {
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xmlDocPtr doc = NULL;
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xmlNodePtr encDataNode = NULL;
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xmlNodePtr keyInfoNode = NULL;
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xmlSecEncCtxPtr encCtx = NULL;
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int res = -1;
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assert(xml_file);
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assert(key_file);
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/* load template */
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doc = xmlParseFile(xml_file);
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if ((doc == NULL) || (xmlDocGetRootElement(doc) == NULL)){
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fprintf(stderr, "Error: unable to parse file \"%s\"\n", xml_file);
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goto done;
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}
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/* create encryption template to encrypt XML file and replace
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* its content with encryption result */
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encDataNode = xmlSecTmplEncDataCreate(doc, xmlSecTransformDes3CbcId,
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NULL, xmlSecTypeEncElement, NULL, NULL);
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if(encDataNode == NULL) {
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fprintf(stderr, "Error: failed to create encryption template\n");
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goto done;
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}
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/* we want to put encrypted data in the <enc:CipherValue/> node */
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if(xmlSecTmplEncDataEnsureCipherValue(encDataNode) == NULL) {
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fprintf(stderr, "Error: failed to add CipherValue node\n");
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goto done;
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}
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/* add <dsig:KeyInfo/> and <dsig:KeyName/> nodes to put key name in the signed document */
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keyInfoNode = xmlSecTmplEncDataEnsureKeyInfo(encDataNode, NULL);
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if(keyInfoNode == NULL) {
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fprintf(stderr, "Error: failed to add key info\n");
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goto done;
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}
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if(xmlSecTmplKeyInfoAddKeyName(keyInfoNode, NULL) == NULL) {
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fprintf(stderr, "Error: failed to add key name\n");
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goto done;
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}
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/* create encryption context, we don't need keys manager in this example */
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encCtx = xmlSecEncCtxCreate(NULL);
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if(encCtx == NULL) {
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fprintf(stderr,"Error: failed to create encryption context\n");
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goto done;
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}
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/* load DES key, assuming that there is not password */
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encCtx->encKey = xmlSecKeyReadBinaryFile(xmlSecKeyDataDesId, key_file);
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if(encCtx->encKey == NULL) {
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fprintf(stderr,"Error: failed to load des key from binary file \"%s\"\n", key_file);
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goto done;
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}
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/* set key name to the file name, this is just an example! */
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if(xmlSecKeySetName(encCtx->encKey, key_file) < 0) {
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fprintf(stderr,"Error: failed to set key name for key from \"%s\"\n", key_file);
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goto done;
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}
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/* encrypt the data */
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if(xmlSecEncCtxXmlEncrypt(encCtx, encDataNode, xmlDocGetRootElement(doc)) < 0) {
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fprintf(stderr,"Error: encryption failed\n");
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goto done;
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}
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/* we template is inserted in the doc */
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encDataNode = NULL;
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/* print encrypted data with document to stdout */
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xmlDocDump(stdout, doc);
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/* success */
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res = 0;
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done:
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/* cleanup */
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if(encCtx != NULL) {
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xmlSecEncCtxDestroy(encCtx);
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}
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if(encDataNode != NULL) {
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xmlFreeNode(encDataNode);
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}
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if(doc != NULL) {
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xmlFreeDoc(doc);
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}
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return(res);
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}
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</pre></div>
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</div>
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<div class="sect2">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="xmlsec-example-encrypt2-doc"></a>encrypt2-doc.xml</h3></div></div></div>
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<div class="informalexample"><pre class="programlisting">
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<?xml version="1.0" encoding="UTF-8"?>
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<!--
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XML Security Library example: Original XML doc file before encryption (encrypt2 example).
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-->
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<Envelope xmlns="urn:envelope">
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<Data>
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Hello, World!
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</Data>
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</Envelope>
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</pre></div>
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</div>
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<div class="sect2">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="xmlsec-example-encrypt2-res"></a>encrypt2-res.xml</h3></div></div></div>
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<div class="informalexample"><pre class="programlisting">
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<?xml version="1.0" encoding="UTF-8"?>
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<!--
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XML Security Library example: Encrypted XML file (encrypt2 example).
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-->
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<EncryptedData xmlns="http://www.w3.org/2001/04/xmlenc#" Type="http://www.w3.org/2001/04/xmlenc#Element">
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<EncryptionMethod Algorithm="http://www.w3.org/2001/04/xmlenc#tripledes-cbc"/>
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<KeyInfo xmlns="http://www.w3.org/2000/09/xmldsig#">
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<KeyName>deskey.bin</KeyName>
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</KeyInfo>
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<CipherData>
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<CipherValue>WXlDyktaADlUe+PywKwS3KdKlahCteEKxi/hRlHcXNQlGwNGrYKy8aQ6dLtX1bKg
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IgL/XoAQN3B27zD91b1ZLGh6QQ9CjnVD98+hYJ9TPp4piPnII4vGUA==</CipherValue>
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</CipherData>
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</EncryptedData>
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</pre></div>
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</div>
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</div>
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