Javascript端加密java服务端解密

Posted 2020-10-04 小鸭嘎嘎

tags:

篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了Javascript端加密java服务端解密相关的知识，希望对你有一定的参考价值。

通常我们会通过htts来保证传输安全，但如果我们不用https，如何通过javascript来保证浏览器端发送的参数进行加密，并且通过RSA算法来处理。

这里我们可以利用jquery的一个加密插件jcryption来处理，可以参考

http://jcryption.org/#examples

现在版本是3.0 但是没有java端的实现，下次有时间再研究。现在这个用的是1.1的版本

这个可以在

http://linkwithweb.googlecode.com/svn/trunk/Utilities/jCryptionTutorial 获取

不过他的服务端有个缺陷我修改了。

接来大致介绍如下：

1. 首先服务端有产生publicKey的servlet：

package com.gsh.oauth.auth.servlet;

import java.io.IOException;

import java.security.KeyPair;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import com.gsh.oauth.auth.util.JCryptionUtil;

/**

* Servlet implementation class EncryptionServlet

public class EncryptionServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

/**

* Default constructor.

public EncryptionServlet() {

// TODO Auto-generated constructor stub

}

/**

* @see HttpServlet#service(HttpServletRequest request, HttpServletResponse response)

protected void service(HttpServletRequest request,

HttpServletResponse response) throws ServletException, IOException {

int KEY_SIZE = 1024;

if (request.getParameter("generateKeypair") != null) {

JCryptionUtil jCryptionUtil = new JCryptionUtil();

KeyPair keys = null;

//if (request.getSession().getAttribute("keys") == null) { //这里注释掉否则第二次请求会500

keys = jCryptionUtil.generateKeypair(KEY_SIZE);

request.getSession().setAttribute("keys", keys);

//}

StringBuffer output = new StringBuffer();

String e = JCryptionUtil.getPublicKeyExponent(keys);

String n = JCryptionUtil.getPublicKeyModulus(keys);

String md = String.valueOf(JCryptionUtil.getMaxDigits(KEY_SIZE));

output.append("{\"e\":\"");

output.append(e);/Files/linugb118/bcprov-jdk15-1.46.jar.zip

output.append("\",\"n\":\"");

output.append(n);

output.append("\",\"maxdigits\":\"");

output.append(md);

output.append("\"}");

output.toString();

response.getOutputStream().print(

output.toString().replaceAll("\r", "").replaceAll("\n", "")

.trim());

} else {

response.getOutputStream().print(String.valueOf(false));

}

2. Client例子

<html>

<head>

<title>Login form</title>

</head>

content="text/html; charset=utf-8">

type="text/javascript"></script>

src="../js/security/jquery.jcryption-1.1.min.js"></script>

$(document).ready(function() {

var $statusText = $(‘<span id="status"></span>‘).hide();

$("#status_container").append($statusText);

$("#lf").jCryption({

getKeysURL:"/gsh/oauth/encryption?generateKeypair=true",

beforeEncryption : function() {

$statusText

.text("Test Code")

.show();

return true;

encryptionFinished : function(

encryptedString,

objectLength) {

$statusText

.text(encryptedString);

return true;

}

});

</script>

<body>

<form id="lf" action="/gsh/oauth/authorization"

method="post">

<fieldset><legend>login</legend>

<div>

<div>client_id:<br>

<div>redirect_uri:<br>

</div>

<div>loginid:<br>

</div>

<div>password:<br>

</div>

<div>

</div>

</fieldset>

</form>

</body>

</html>

上面看代码可以看出他通过/gsh/oauth/encryption?generateKeypair=true来先请求获取public 然后通过jcryption进行加密 然后post到服务端。Encryption就是上面的EncryptionServlet。

通过浏览器工具可以看到表单里面的数据加密为

jCryption=95f1589502288050e08b4bd8b1a360341cf616d9054531b85a6ef85783c1723b46686ec454ee81f1304fa2370ce24c4d9c06f84d47aa4bdf99310ae12b514db19bfcc325f3a39a584c23b1546550f4e0635c12486f2fd84dec137e1c61cfa775dfa3057a1f0154712aaba0af0cc61810282780f15bed909c24a184e66ab39f2e

3. 目标servlet（authorization）的解密

public class Authorization extends HttpServlet {

protected void doGet(HttpServletRequest httpServletRequest,

HttpServletResponse httpServletResponse) throws ServletException,

IOException {

PrintWriter out = httpServletResponse.getWriter();

KeyPair keys = (KeyPair) httpServletRequest.getSession().getAttribute("keys");

String encrypted = httpServletRequest.getParameter("epCryption");

String client_id = null;

String redirect_uri = null;

String loginid = null;

String password = null;