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Java写的DES加密程序

2004-11-08 09:59 459 查看

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>

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