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This is especialy useful + when you are encrypting or signing something with a session key + which is by itself should be encrypted. The key for the + session key encryption in the + <a href="http://www.w3.org/TR/xmlenc-core/#sec-EncryptedKey" target="_top"><EncryptedKey/></a> + node could be selected using + <a href="http://www.w3.org/TR/xmldsig-core/#sec-KeyName" target="_top"><dsig:KeyName/></a> + node in the template. + </p> +<p> </p> +<div class="EXAMPLE"> +<a name="AEN378"></a><p><b>Example 2. Encrypting file using a session key and a permanent key from keys manager.</b></p> +<pre class="PROGRAMLISTING">/** + * load_rsa_keys: + * @key_file: the key filename. + * + * Creates default 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 default 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, + xmlSecTransformRsaOaepId, + 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); +} + + </pre> +<p><a href="xmlsec-encrypt-with-session-key.html#XMLSEC-EXAMPLE-ENCRYPT3">Full program listing</a></p> +</div> + </div> +<table class="navigation" width="100%" summary="Navigation footer" cellpadding="2" cellspacing="2"><tr valign="middle"> +<td align="left"><a accesskey="p" href="xmlsec-notes-simple-keys-store.html"><b><<< Simple keys store.</b></a></td> +<td align="right"><a accesskey="n" href="xmlsec-notes-keys-mngr-verify-decrypt.html"><b>Using keys manager for verification/decryption. >>></b></a></td> +</tr></table> +</td></tr></table></td> +</tr></table></body> +</html> |