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The XML Security Library sets the content of these + nodes after doing necessary calculations. + </p> +<div class="FIGURE"> +<a name="AEN256"></a><p><b>Figure 2. XML Encryption structure</b></p> +<pre class="PROGRAMLISTING"><enc:EncryptedData Id? Type? MimeType? Encoding?> + <enc:EncryptionMethod Algorithm />? + (<dsig:KeyInfo> + <dsig:KeyName>? + <dsig:KeyValue>? + <dsig:RetrievalMethod>? + <dsig:X509Data>? + <dsig:PGPData>? + <enc:EncryptedKey>? + <enc:AgreementMethod>? + <dsig:KeyName>? + <dsig:RetrievalMethod>? + <*>? + </dsig:KeyInfo>)? + <enc:CipherData> + <enc:CipherValue>? + <enc:CipherReference URI?>? + </enc:CipherData> + <enc:EncryptionProperties>? +</enc:EncryptedData> + </pre> +</div> +<p> </p> +<div class="EXAMPLE"> +<a name="AEN260"></a><p><b>Example 2. Creating dynamic encrytion template.</b></p> +<pre class="PROGRAMLISTING">/** + * 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 = 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/> and <dsig:KeyName/> 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->encKey = xmlSecKeyReadBinaryFile(xmlSecKeyDataDesId, key_file); + if(encCtx->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->encKey, key_file) < 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)) < 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-dynamic-template.html#XMLSEC-EXAMPLE-ENCRYPT2">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-dynamic-signature-templates.html"><b><<< Creating dynamic signature templates.</b></a></td> +<td align="right"><a accesskey="n" href="xmlsec-notes-verify-decrypt.html"><b>Verifing and decrypting documents. >>></b></a></td> +</tr></table> +</td></tr></table></td> +</tr></table></body> +</html> |