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+/**
+ * XML Security Library example: Encrypting XML file with a session key and dynamicaly created template.
+ *
+ * Encrypts XML file using a dynamicaly created template file and a session
+ * DES key (encrypted with an RSA key).
+ *
+ * Usage:
+ * ./encrypt3 <xml-doc> <rsa-pem-key-file>
+ *
+ * Example:
+ * ./encrypt3 encrypt3-doc.xml rsakey.pem > encrypt3-res.xml
+ *
+ * The result could be decrypted with decrypt3 example:
+ * ./decrypt3 encrypt3-res.xml
+ *
+ * This is free software; see Copyright file in the source
+ * distribution for preciese wording.
+ *
+ * Copyright (C) 2002-2003 Aleksey Sanin <aleksey@aleksey.com>
+ */
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+#include <libxml/tree.h>
+#include <libxml/xmlmemory.h>
+#include <libxml/parser.h>
+
+#ifndef XMLSEC_NO_XSLT
+#include <libxslt/xslt.h>
+#include <libxslt/security.h>
+#endif /* XMLSEC_NO_XSLT */
+
+#include <xmlsec/xmlsec.h>
+#include <xmlsec/xmltree.h>
+#include <xmlsec/xmlenc.h>
+#include <xmlsec/templates.h>
+#include <xmlsec/crypto.h>
+
+xmlSecKeysMngrPtr load_rsa_keys(char* key_file);
+int encrypt_file(xmlSecKeysMngrPtr mngr, const char* xml_file, const char* key_name);
+
+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 <xml-file> <key-file>\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() < 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) < 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) < 0) {
+ fprintf(stderr, "Error: crypto initialization failed.\n");
+ return(-1);
+ }
+
+ /* Init xmlsec-crypto library */
+ if(xmlSecCryptoInit() < 0) {
+ fprintf(stderr, "Error: xmlsec-crypto initialization failed.\n");
+ return(-1);
+ }
+
+ /* create keys manager and load keys */
+ mngr = load_rsa_keys(argv[2]);
+ if(mngr == NULL) {
+ return(-1);
+ }
+
+ /* we use key filename as key name here */
+ if(encrypt_file(mngr, argv[1], argv[2]) < 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_rsa_keys:
+ * @key_file: the key filename.
+ *
+ * Creates simple keys manager and load RSA key from #key_file 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_rsa_keys(char* key_file) {
+ xmlSecKeysMngrPtr mngr;
+ xmlSecKeyPtr key;
+
+ assert(key_file);
+
+ /* 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) < 0) {
+ fprintf(stderr, "Error: failed to initialize keys manager.\n");
+ xmlSecKeysMngrDestroy(mngr);
+ return(NULL);
+ }
+
+ /* load private RSA key */
+ key = xmlSecCryptoAppKeyLoad(key_file, xmlSecKeyDataFormatPem, NULL, NULL, NULL);
+ if(key == NULL) {
+ fprintf(stderr,"Error: failed to load rsa key from file \"%s\"\n", key_file);
+ xmlSecKeysMngrDestroy(mngr);
+ return(NULL);
+ }
+
+ /* set key name to the file name, this is just an example! */
+ if(xmlSecKeySetName(key, BAD_CAST key_file) < 0) {
+ fprintf(stderr,"Error: failed to set key name for key from \"%s\"\n", key_file);
+ 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) < 0) {
+ fprintf(stderr,"Error: failed to add key from \"%s\" to keys manager\n", key_file);
+ xmlSecKeyDestroy(key);
+ xmlSecKeysMngrDestroy(mngr);
+ return(NULL);
+ }
+
+ return(mngr);
+}
+
+/**
+ * encrypt_file:
+ * @mngr: the pointer to keys manager.
+ * @xml_file: the encryption template file name.
+ * @key_name: the RSA key name.
+ *
+ * Encrypts #xml_file using a dynamicaly created template, a session DES key
+ * and an RSA key from keys manager.
+ *
+ * Returns 0 on success or a negative value if an error occurs.
+ */
+int
+encrypt_file(xmlSecKeysMngrPtr mngr, const char* xml_file, const char* key_name) {
+ xmlDocPtr doc = NULL;
+ xmlNodePtr encDataNode = NULL;
+ xmlNodePtr keyInfoNode = NULL;
+ xmlNodePtr encKeyNode = NULL;
+ xmlNodePtr keyInfoNode2 = NULL;
+ xmlSecEncCtxPtr encCtx = NULL;
+ int res = -1;
+
+ assert(mngr);
+ assert(xml_file);
+ assert(key_name);
+
+ /* load template */
+ doc = xmlParseFile(xml_file);
+ 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 <enc:CipherValue/> node */
+ if(xmlSecTmplEncDataEnsureCipherValue(encDataNode) == NULL) {
+ fprintf(stderr, "Error: failed to add CipherValue node\n");
+ goto done;
+ }
+
+ /* add <dsig:KeyInfo/> */
+ keyInfoNode = xmlSecTmplEncDataEnsureKeyInfo(encDataNode, NULL);
+ if(keyInfoNode == NULL) {
+ fprintf(stderr, "Error: failed to add key info\n");
+ goto done;
+ }
+
+ /* add <enc:EncryptedKey/> to store the encrypted session key */
+ encKeyNode = xmlSecTmplKeyInfoAddEncryptedKey(keyInfoNode,
+ xmlSecTransformRsaPkcs1Id,
+ NULL, NULL, NULL);
+ if(encKeyNode == NULL) {
+ fprintf(stderr, "Error: failed to add key info\n");
+ goto done;
+ }
+
+ /* we want to put encrypted key in the <enc:CipherValue/> node */
+ if(xmlSecTmplEncDataEnsureCipherValue(encKeyNode) == NULL) {
+ fprintf(stderr, "Error: failed to add CipherValue node\n");
+ goto done;
+ }
+
+ /* add <dsig:KeyInfo/> and <dsig:KeyName/> nodes to <enc:EncryptedKey/> */
+ keyInfoNode2 = xmlSecTmplEncDataEnsureKeyInfo(encKeyNode, NULL);
+ if(keyInfoNode2 == NULL) {
+ fprintf(stderr, "Error: failed to add key info\n");
+ goto done;
+ }
+
+ /* set key name so we can lookup key when needed */
+ if(xmlSecTmplKeyInfoAddKeyName(keyInfoNode2, key_name) == NULL) {
+ fprintf(stderr, "Error: failed to add key name\n");
+ goto done;
+ }
+
+ /* create encryption context */
+ encCtx = xmlSecEncCtxCreate(mngr);
+ if(encCtx == NULL) {
+ fprintf(stderr,"Error: failed to create encryption context\n");
+ goto done;
+ }
+
+ /* generate a Triple DES key */
+ encCtx->encKey = xmlSecKeyGenerate(xmlSecKeyDataDesId, 192, xmlSecKeyDataTypeSession);
+ if(encCtx->encKey == NULL) {
+ fprintf(stderr,"Error: failed to generate session des key\n");
+ goto done;
+ }
+
+ /* encrypt the data */
+ if(xmlSecEncCtxXmlEncrypt(encCtx, encDataNode, xmlDocGetRootElement(doc)) < 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);
+}
+