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docs/api/xmlsec-notes-encrypt.html
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lsh123
Update docs (#1082)
18 мар 2026, 04:43
Не верифицирован
18 мар 2026, 04:43
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<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Encrypting data.: XML Security Library Reference Manual</title> <meta name="generator" content="DocBook XSL Stylesheets Vsnapshot"> <link rel="home" href="index.html" title="XML Security Library Reference Manual"> <link rel="up" href="xmlsec-notes-sign-encrypt.html" title="Signing and encrypting documents."> <link rel="prev" href="xmlsec-notes-sign.html" title="Signing a document."> <link rel="next" href="xmlsec-notes-templates.html" title="Creating dynamic templates."> <meta name="generator" content="GTK-Doc V1.34.0 (XML mode)"> <link rel="stylesheet" href="style.css" type="text/css"> </head> <body><table width="100%" valign="top"><tr valign="top"> <td valign="top" align="left" width="210"> <img src="../images/logo.gif" alt="XML Security Library" border="0"><p></p> <ul> <li><a href="../index.html">Home</a></li> <li><a href="../download.html">Download</a></li> <ul><li><a href="../https://github.com/lsh123/xmlsec">GitHub</a></li></ul> <li><a href="../news.html">News</a></li> <li><a href="../documentation.html">Documentation</a></li> <ul> <li><a href="../faq.html">FAQ</a></li> <li><a href="../api/xmlsec-notes.html">Tutorial</a></li> <li><a href="../api/xmlsec-reference.html">API reference</a></li> <li><a href="../api/xmlsec-examples.html">Examples</a></li> </ul> <li><a href="../xmldsig.html">XML Digital Signature</a></li> <li><a href="../xmlenc.html">XML Encryption</a></li> <li><a href="../c14n.html">XML Canonicalization</a></li> <li><a href="../bugs.html">Reporting Bugs</a></li> <li><a href="mailing-list.html">Mailing list</a></li> <li><a href="../related.html">Related</a></li> <li><a href="../authors.html">Authors</a></li> </ul> <table width="100%"> <tr> <td width="15"></td> <td><a href="http://xmlsoft.org/"><img src="../images/libxml2-logo.png" alt="LibXML2" border="0"></a></td> </tr> <tr> <td width="15"></td> <td><a href="http://xmlsoft.org/XSLT"><img src="../images/libxslt-logo.png" alt="LibXSLT" border="0"></a></td> </tr> <tr> <td width="15"></td> <td><a href="http://www.openssl.org/"><img src="../images/openssl-logo.png" alt="OpenSSL" border="0"></a></td> </tr> <!--Links - start--><!--Links - end--> </table> </td> <td valign="top"><table width="80%" valign="top" style="margin-left:10px;"><tr><td valign="top" align="left" id="xmlsecContent"> <table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle"> <td width="100%" align="left" class="shortcuts"></td> <td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td> <td><a accesskey="u" href="xmlsec-notes-sign-encrypt.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td> <td><a accesskey="p" href="xmlsec-notes-sign.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td> <td><a accesskey="n" href="xmlsec-notes-templates.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td> </tr></table> <div class="sect1"> <div class="titlepage"><div><div><h2 class="title" style="clear: both"> <a name="xmlsec-notes-encrypt"></a>Encrypting data.</h2></div></div></div> <p>The typical encryption process includes following steps: </p> <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> <li class="listitem"><p> Prepare data for encryption. </p></li> <li class="listitem"><p> Create or load encryption template and select start <enc:EncryptedData/> node. </p></li> <li class="listitem"><p> Create encryption context <a class="link" href="xmlsec-xmlenc.html#xmlSecEncCtx" title="struct xmlSecEncCtx">xmlSecEncCtx</a> using <a class="link" href="xmlsec-xmlenc.html#xmlSecEncCtxCreate" title="xmlSecEncCtxCreate ()">xmlSecEncCtxCreate</a> or <a class="link" href="xmlsec-xmlenc.html#xmlSecEncCtxInitialize" title="xmlSecEncCtxInitialize ()">xmlSecEncCtxInitialize</a> functions. </p></li> <li class="listitem"><p> Load encryption key in <a class="link" href="xmlsec-keysmngr.html#xmlSecKeysMngr" title="struct xmlSecKeysMngr">keys manager</a> or generate a session key and set it in the encryption context (<em class="structfield"><code>encKey</code></em> member of <a class="link" href="xmlsec-xmlenc.html#xmlSecEncCtx" title="struct xmlSecEncCtx">xmlSecEncCtx</a> structure). </p></li> <li class="listitem"> <p> Encrypt data by calling one of the following functions: </p> <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: circle; "> <li class="listitem"><p> <a class="link" href="xmlsec-xmlenc.html#xmlSecEncCtxBinaryEncrypt" title="xmlSecEncCtxBinaryEncrypt ()">xmlSecEncCtxBinaryEncrypt</a> </p></li> <li class="listitem"><p> <a class="link" href="xmlsec-xmlenc.html#xmlSecEncCtxXmlEncrypt" title="xmlSecEncCtxXmlEncrypt ()">xmlSecEncCtxXmlEncrypt</a> </p></li> <li class="listitem"><p> <a class="link" href="xmlsec-xmlenc.html#xmlSecEncCtxUriEncrypt" title="xmlSecEncCtxUriEncrypt ()">xmlSecEncCtxUriEncrypt</a> </p></li> </ul></div> <p> </p> </li> <li class="listitem"><p> Check returned value and if necessary consume encrypted data. </p></li> <li class="listitem"><p> Destroy encryption context <a class="link" href="xmlsec-xmlenc.html#xmlSecEncCtx" title="struct xmlSecEncCtx">xmlSecEncCtx</a> using <a class="link" href="xmlsec-xmlenc.html#xmlSecEncCtxDestroy" title="xmlSecEncCtxDestroy ()">xmlSecEncCtxDestroy</a> or <a class="link" href="xmlsec-xmlenc.html#xmlSecEncCtxFinalize" title="xmlSecEncCtxFinalize ()">xmlSecEncCtxFinalize</a> functions. </p></li> </ul></div> <p> </p> <p> </p> <div class="example"> <a name="id-1.2.6.4.3.1"></a><p class="title"><b>Example 11. Encrypting binary data with a template.</b></p> <div class="example-contents"> <pre class="programlisting"> /** * encrypt_file: * @tmpl_file: the encryption template file name. * @key_file: the Triple DES key file. * @data: the binary data to encrypt. * @dataSize: the binary data size. * * Encrypts binary #data using template from #tmpl_file and DES key from * #key_file. * * Returns 0 on success or a negative value if an error occurs. */ int encrypt_file(const char* tmpl_file, const char* key_file, const unsigned char* data, size_t dataSize) { xmlDocPtr doc = NULL; xmlNodePtr node = NULL; xmlSecEncCtxPtr encCtx = NULL; int res = -1; assert(tmpl_file); assert(key_file); assert(data); /* load template */ doc = xmlParseFile(tmpl_file); if ((doc == NULL) || (xmlDocGetRootElement(doc) == NULL)){ fprintf(stderr, "Error: unable to parse file \"%s\"\n", tmpl_file); goto done; } /* find start node */ node = xmlSecFindNode(xmlDocGetRootElement(doc), xmlSecNodeEncryptedData, xmlSecEncNs); if(node == NULL) { fprintf(stderr, "Error: start node not found in \"%s\"\n", tmpl_file); 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 */ 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(xmlSecEncCtxBinaryEncrypt(encCtx, node, data, dataSize) < 0) { fprintf(stderr,"Error: encryption failed\n"); goto done; } /* print encrypted data with document to stdout */ xmlDocDump(stdout, doc); /* success */ res = 0; done: /* cleanup */ if(encCtx != NULL) { xmlSecEncCtxDestroy(encCtx); } if(doc != NULL) { xmlFreeDoc(doc); } return(res); } </pre> <p><a class="link" href="xmlsec-encrypt-template-file.html#xmlsec-example-encrypt1" title="encrypt1.c">Full program listing</a></p> <p><a class="link" href="xmlsec-encrypt-template-file.html#xmlsec-example-encrypt1-tmpl" title="encrypt1-tmpl.xml">Simple encryption template file</a></p> </div> </div> <p><br class="example-break"> </p> </div> <div class="footer"> <hr>Generated by GTK-Doc V1.34.0</div> </td></tr></table></td> </tr></table></body> </html>