[code]/**
* @(#)Eryptogram.java 1.00 04/03/11
*
* Copyright (c) 2003-2004 Abacus,Ltd.
*
* 加密解密类
*
*
*
*/
package com.abacus.common;
import java.security.*;
import javax.crypto.*;
/**
* 加密解密类
* @author WangHu
* @version 1.00 2004年03月18日
*/
public class Eryptogram{
private static String Algorithm="DES"; //定义 加密算法,可用 DES,DESede,Blowfish
static boolean debug = false;
/**
* 构造子注解.
*/
public Eryptogram(){
}
/**
* 生成密钥
* @return byte[] 返回生成的密钥
* @throws exception 扔出异常.
*/
public static byte[] getSecretKey() throws Exception{
KeyGenerator keygen = KeyGenerator.getInstance(Algorithm);
SecretKey deskey = keygen.generateKey();
if (debug)
System.out.println("生成密钥:"+byte2hex(deskey.getEncoded()));
return deskey.getEncoded();
}
/**
* 将指定的数据根据提供的密钥进行加密
* @param input 需要加密的数据
* @param key 密钥
* @return byte[] 加密后的数据
* @throws Exception
*/
public static byte[] encryptData(byte[] input,byte[] key) throws Exception{
SecretKey deskey = new javax.crypto.spec.SecretKeySpec(key,Algorithm);
if (debug){
System.out.println("加密前的二进串:"+byte2hex(input));
System.out.println("加密前的字符串:"+new String(input));
}
Cipher c1 = Cipher.getInstance(Algorithm);
c1.init(Cipher.ENCRYPT_MODE,deskey);
byte[] cipherByte=c1.doFinal(input);
if (debug)
System.out.println("加密后的二进串:"+byte2hex(cipherByte));
return cipherByte;
}
/**
* 将给定的已加密的数据通过指定的密钥进行解密
* @param input 待解密的数据
* @param key 密钥
* @return byte[] 解密后的数据
* @throws Exception
*/
public static byte[] decryptData(byte[] input,byte[] key) throws Exception{
SecretKey deskey = new javax.crypto.spec.SecretKeySpec(key,Algorithm);
if (debug)
System.out.println("解密前的信息:"+byte2hex(input));
Cipher c1 = Cipher.getInstance(Algorithm);
c1.init(Cipher.DECRYPT_MODE,deskey);
byte[] clearByte=c1.doFinal(input);
if (debug){
System.out.println("解密后的二进串:"+byte2hex(clearByte));
System.out.println("解密后的字符串:"+(new String(clearByte)));
}
return clearByte;
}
/**
* 字节码转换成16进制字符串
* @param byte[] b 输入要转换的字节码
* @return String 返回转换后的16进制字符串
*/
public static String byte2hex(byte[] b) {
String hs="";
String stmp="";
for (int n=0;n<b.length;n++){
stmp=(java.lang.Integer.toHexString(b[n] & 0XFF));
if (stmp.length()==1)
hs=hs+"0"+stmp;
else hs=hs+stmp;
if (n<b.length-1) hs=hs+":";
}
return hs.toUpperCase();
}
public static void main(String[] args){
try{
debug = false;
Eryptogram etg = new Eryptogram();
byte[] key = etg.getSecretKey();
System.out.println("key = "+key);
String aa = "1234567";
byte[] data = aa.getBytes();
System.out.println(data);
byte[] en = etg.encryptData(data,key);
System.out.println("encryptData = "+new String(en));
byte[] de = etg.decryptData(en,key);
System.out.println("decryptData = "+new String(de));
}catch(Exception e){
e.printStackTrace();
}
}
}[/code]
