在JSP中实现DES加密解密的例子

王朝java/jsp·作者佚名  2006-01-09
窄屏简体版  字體: |||超大  

在JSP中实现DES加密解密的例子

实例下载:点击下载

DES.java

package Lion.Security.Cryptography;

import javax.crypto.Cipher;

import javax.crypto.KeyGenerator;

import javax.crypto.NoSuchPaddingException;

import javax.crypto.SecretKey;

import java.security.NoSuchAlgorithmException;

import java.security.Security;

/**

* DES加密的,文件中共有两个方法,加密、解密

* @author Lion

* @author www.lionsky.net

*/

public class DES {

private String Algorithm = "DES";

private KeyGenerator keygen;

private SecretKey deskey;

private Cipher c;

private byte[] cipherByte;

/**

* 初始化 DES 实例

*/

public DES() {

init();

}

public void init() {

Security.addProvider(new com.sun.crypto.provider.SunJCE());

try {

keygen = KeyGenerator.getInstance(Algorithm);

deskey = keygen.generateKey();

c = Cipher.getInstance(Algorithm);

}

catch(NoSuchAlgorithmException ex){

ex.printStackTrace();

}

catch(NoSuchPaddingException ex){

ex.printStackTrace();

}

}

/**

* 对 String 进行加密

* @param str 要加密的数据

* @return 返回加密后的 byte 数组

*/

public byte[] createEncryptor(String str) {

try {

c.init(Cipher.ENCRYPT_MODE, deskey);

cipherByte = c.doFinal(str.getBytes());

}

catch(java.security.InvalidKeyException ex){

ex.printStackTrace();

}

catch(javax.crypto.BadPaddingException ex){

ex.printStackTrace();

}

catch(javax.crypto.IllegalBlockSizeException ex){

ex.printStackTrace();

}

return cipherByte;

}

/**

* 对 Byte 数组进行解密

* @param buff 要解密的数据

* @return 返回加密后的 String

*/

public String createDecryptor(byte[] buff) {

try {

c.init(Cipher.DECRYPT_MODE, deskey);

cipherByte = c.doFinal(buff);

}

catch(java.security.InvalidKeyException ex){

ex.printStackTrace();

}

catch(javax.crypto.BadPaddingException ex){

ex.printStackTrace();

}

catch(javax.crypto.IllegalBlockSizeException ex){

ex.printStackTrace();

}

return (new String(cipherByte));

}

}

DES.jsp

<%@ page contentType="text/html; charset=gb2312" %>

<jsp:useBean id="DES" scope="page" class="Lion.Security.Cryptography.DES" />

<html>

<head><title>DES File</title></head>

<body bgcolor="#FFFFFF">

<div align="center"><center>

<%

String Test = request.getParameter("Test");

if(Test==null || Test.equals("")) {

%>

<form name="form" method="post">

<input type="text" name="Test" size="25" value=""/>

<input type="submit" name="button" value=" 确定 "/>

</form>

<%

}else{

out.println("加密前的数据:"+Test +"<br/>");

out.println("加密后的数据:"+DES.createEncryptor(Test) +"<br/>");

out.println("解密后的数据:"+DES.createDecryptor(DES.createEncryptor(Test)) +"<br/>");

}

%>

</center></div>

</body>

</html>

 
 
 
免责声明:本文为网络用户发布,其观点仅代表作者个人观点,与本站无关,本站仅提供信息存储服务。文中陈述内容未经本站证实,其真实性、完整性、及时性本站不作任何保证或承诺,请读者仅作参考,并请自行核实相关内容。
 
 
© 2005- 王朝網路 版權所有  導航