DES加密

文章来源：http://blog.csdn.net/hbcui1984/article/details/5065506

package com.judy.Security;

import java.security.SecureRandom;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;

/**
 * @author judy
 */
public class MySecurity {
    public byte[] desCrypto(byte[] datasource, String password) {              
        try{  
        SecureRandom random = new SecureRandom();  
        DESKeySpec desKey = new DESKeySpec(password.getBytes());  
        //创建一个密匙工厂，然后用它把DESKeySpec转换成  
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");  
        SecretKey securekey = keyFactory.generateSecret(desKey);  
        //Cipher对象实际完成加密操作  
        Cipher cipher = Cipher.getInstance("DES");  
        //用密匙初始化Cipher对象  
        cipher.init(Cipher.ENCRYPT_MODE, securekey, random);  
        //现在，获取数据并加密  
        //正式执行加密操作  
        return cipher.doFinal(datasource);  
        }catch(Throwable e){  
                e.printStackTrace();  
        }  
        return null;  
}  
    private byte[] decrypt(byte[] src, String password) throws Exception {  
        // DES算法要求有一个可信任的随机数源  
        SecureRandom random = new SecureRandom();  
        // 创建一个DESKeySpec对象  
        DESKeySpec desKey = new DESKeySpec(password.getBytes());  
        // 创建一个密匙工厂  
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");  
        // 将DESKeySpec对象转换成SecretKey对象  
        SecretKey securekey = keyFactory.generateSecret(desKey);  
        // Cipher对象实际完成解密操作  
        Cipher cipher = Cipher.getInstance("DES");  
        // 用密匙初始化Cipher对象  
        cipher.init(Cipher.DECRYPT_MODE, securekey, random);  
        // 真正开始解密操作  
        return cipher.doFinal(src);  
}  
    public static void main(String[] args) {
    	MySecurity ms = new MySecurity();
        //待加密内容  
        String str = "测试内容";  
        //密码，长度要是8的倍数  
        String password = "12345678";  
        byte[] result = ms.desCrypto(str.getBytes(),password);  
        System.out.println("加密后内容为："+new String(result));  
          
        //直接将如上内容解密  
        try {  
                byte[] decryResult = ms.decrypt(result, password);  
                System.out.println("加密后内容为："+new String(decryResult));  
        } catch (Exception e1) {  
                e1.printStackTrace();  
        }  
	}

}