Java加密算法 PBE详解编程语言

import java.util.Arrays;   
   
import javax.crypto.Cipher;   
import javax.crypto.SecretKey;   
import javax.crypto.SecretKeyFactory;   
import javax.crypto.spec.PBEKeySpec;   
import javax.crypto.spec.PBEParameterSpec;   
   
/**  
 * PBE算法 对称加密 password-based encryption  
 * @author stone  
 * @date 2014-03-10 23:41:35  
 */   
public class PBE {   
    static final String KEY_ALGORITHM = "PBEWithMD5AndDES";   
//  static byte[] salt = "xiaoyang".getBytes(); // 盐：Salt must be 8 bytes long   
    static byte[] salt = "哈皮aa".getBytes(); // 盐：Salt must be 8 bytes long  哈皮，在utf8中是6个字节   
    static int iterationCount = 888; //循环次数   
    static Cipher cipher;   
       
    public static void main(String[] args) throws Exception {   
        byte[] encrypt = encrypt("中华人民admin*&(*S&6");   
        System.out.println("PBE加密后：" + Arrays.toString(encrypt));   
           
        System.out.println("PBE解密后：" + decrypt(encrypt));   
    }   
       
    /**  
     * 使用PBE 算法 加密  
     * @return  加密后的字符数组  
     * @throws Exception  
     */   
    static byte[] encrypt(String str) throws Exception {   
        cipher = Cipher.getInstance(KEY_ALGORITHM);   
           
        //使用SecretKeyFactory 生成key   
        SecretKeyFactory factory = SecretKeyFactory.getInstance(KEY_ALGORITHM);   
        PBEKeySpec keySpec = new PBEKeySpec("shizongyin".toCharArray());   
        SecretKey key = factory.generateSecret(keySpec);   
        System.out.println("key:" + Arrays.toString(key.getEncoded()));   
           
        cipher.init(Cipher.ENCRYPT_MODE, key, new PBEParameterSpec(salt, iterationCount));//使用加密模式初始化 密钥   
        return cipher.doFinal(str.getBytes()); //按单部分操作加密或解密数据，或者结束一个多部分操作。   
    }   
       
    /**  
     *   
     * @param encrypt  
     * @return  
     * @throws Exception  
     */   
    static String decrypt(byte[] encrypt) throws Exception {   
        cipher = Cipher.getInstance(KEY_ALGORITHM);   
           
        //使用SecretKeyFactory 生成key   
        SecretKeyFactory factory = SecretKeyFactory.getInstance(KEY_ALGORITHM);   
        PBEKeySpec keySpec = new PBEKeySpec("shizongyin".toCharArray());   
        SecretKey key = factory.generateSecret(keySpec);   
        System.out.println("key:" + Arrays.toString(key.getEncoded()));   
           
        cipher.init(Cipher.DECRYPT_MODE, key, new PBEParameterSpec(salt, iterationCount));//使用加密模式初始化 密钥   
        byte[] result = cipher.doFinal(encrypt); //按单部分操作加密或解密数据，或者结束一个多部分操作。   
           
        return new String(result);   
    }   
       
}