客户端JavaScript加密数据，服务端Java解密数据

来源：互联网发布：php print 编辑：程序博客网时间：2024/04/30 10:21

在普通的页面提交时，如果没有使用SSL，提交的数据将使用纯文本的方式发送。如果使用抓包工具可以轻易地截获一些关键数据。

jCryption是一个jQuery插件，能够加密由Forms提交的POST/GET数据。官网地址：http://www.jcryption.org/

未加密处理的效果如下：可很容易地看到登录时的用户名和口令。

使用jCryption后效果如下，提交的数据为密文。

本例中服务端使用Java进行解密，使用了一个开源项目JavaCription，官网地址：https://jcryptionforjava.wordpress.com/。实现了针对jCryption2.0的Java解密。

处理机制如下：

1、客户端从服务端请求一个RSA公钥

2、客户端产生一个随机数作为AES密钥，用RSA公钥进行加密，发送到服务端

3、服务端用RSA私钥进行解密，同时将AES密钥保持到会话中

4、服务端用AES算法加密AES密钥并送回给客户端

5、客户端用AES算法解密，并与本地保存的AES密钥做比对，如果相符就认为服务端是合法的

6、客户端提交数据，数据用AES密钥进行加密

在此版本里为提供效率，只使用RSA非对称算法进行密钥交换，数据的加解密使用AES对称算法。

客户端

引入两个js文件

表单加密，设定两个地址：1）获取公钥 2）握手交换AES密钥

服务端

密钥服务Servlet

public class CryptoServlet extends HttpServlet{/** * serialVersionUID */private static final long serialVersionUID = 4510110365995157499L;/** * Handles a POST request *  * @see HttpServlet */public void doPost(HttpServletRequest req, HttpServletResponse res) throws IOException, ServletException {HttpServletRequest request = (HttpServletRequest) req;HttpServletResponse response = (HttpServletResponse) res;/** Generates a KeyPair for RSA **/if (req.getParameter("generateKeyPair") != null && req.getParameter("generateKeyPair").equals("true")) {JCryption jc = new JCryption();KeyPair keys = jc.getKeyPair();request.getSession().getServletContext().setAttribute("jCryptionKeys", keys);String e = jc.getPublicExponent();String n = jc.getKeyModulus();String md = String.valueOf(jc.getMaxDigits());/** Sends response **/PrintWriter out = response.getWriter();out.print("{\"e\":\"" + e + "\",\"n\":\"" + n + "\",\"maxdigits\":\"" + md + "\"}");return;}/** jCryption handshake **/else if (req.getParameter("handshake") != null && req.getParameter("handshake").equals("true")) {/** Decrypts password using private key **/JCryption jc = new JCryption((KeyPair) request.getSession().getServletContext().getAttribute("jCryptionKeys"));String a = req.getParameter("key");System.out.println(a);String key = jc.decrypt(req.getParameter("key"));request.getSession().getServletContext().removeAttribute("jCryptionKeys");request.getSession().getServletContext().setAttribute("jCryptionKey", key);/** Encrypts password using AES **/String ct = AesCtr.encrypt(key, key, 256);/** Sends response **/PrintWriter out = response.getWriter();out.print("{\"challenge\":\"" + ct + "\"}");return;}/** jCryption request to decrypt a String **/else if (req.getParameter("decryptData") != null && req.getParameter("decryptData").equals("true")&& req.getParameter("jCryption") != null) {/** Decrypts the request using password **/String key = (String) request.getSession().getServletContext().getAttribute("jCryptionKey");String pt = AesCtr.decrypt(req.getParameter("jCryption"), key, 256);/** Sends response **/PrintWriter out = response.getWriter();out.print("{\"data\":\"" + pt + "\"}");return;}/** jCryption request to encrypt a String **/else if (req.getParameter("encryptData") != null && req.getParameter("encryptData").equals("true")&& req.getParameter("jCryption") != null) {/** Encrypts the request using password **/String key = (String) request.getSession().getServletContext().getAttribute("jCryptionKey");String ct = AesCtr.encrypt(req.getParameter("jCryption"), key, 256);/** Sends response **/PrintWriter out = response.getWriter();out.print("{\"data\":\"" + ct + "\"}");return;}/** A test request from jCryption **/else if (req.getParameter("decryptTest") != null && req.getParameter("decryptTest").equals("true")) {/** Encrypts a timestamp **/String key = (String) request.getSession().getServletContext().getAttribute("jCryptionKey");String date = DateFormat.getInstance().format(new Date());String ct = AesCtr.encrypt(date, key, 256);/** Sends response **/PrintWriter out = response.getWriter();out.print("{\"encrypted\":\"" + ct + "\", \"unencrypted\":\"" + date + "\"}");return;}}/** * Handles a GET request *  * @see HttpServlet */public void doGet(HttpServletRequest req, HttpServletResponse res) throws IOException, ServletException {doPost(req, res);}}

过虑器，进行数据解密

密文：5QN8EsTjylTGSyvrmYGXDUD/MjF3qcl58pZtI7xhCk5HMUYFjf7kJe/leQLAuqzW4dPUNw==
明文：loginName=admin&password=admin&Submit=提交

public class SecureFilter implements Filter{private FilterConfig conf;public void destroy() {// TODO Auto-generated method stub}public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException,ServletException {String jCryption = request.getParameter("jCryption");System.out.println(jCryption);String key = (String) conf.getServletContext().getAttribute("jCryptionKey");String source = AesCtr.decrypt(jCryption, key, 256);System.out.println(source);String[] params = source.split("&");for(int i=0;i<params.length;i++){String [] aparam = params[i].split("=");request.setAttribute(aparam[0], aparam[1]);}chain.doFilter(request, response);}public void init(FilterConfig filterConfig) throws ServletException {this.conf = filterConfig;}}

处理器，从request.getAttribute中获取数据

String loginName = passwordAuthcInfo.getLoginName();String loginPassword = passwordAuthcInfo.getPassword();if(loginName == null && loginPassword == null){loginName = (String)request.getAttribute("loginName");loginPassword = (String)request.getAttribute("password");}

工程源码：smallShow-v0.9.3.rar

应用程序：smallShow.war 直接拷贝到Tomcat下即可运行

javacryption工程：javacryption-1.0.zip

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