Java加密算法 PBE

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 對稱加密 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(); // 鹽：Salt must be 8 bytes long

 static byte[] salt = "哈皮aa".getBytes(); // 鹽：Salt must be 8 bytes long  哈皮，在utf8中是6個字節

 static int iterationCount = 888; //循環次數

 static Cipher cipher;
public static void main(String[] args) throws Exception {

 byte[] encrypt = encrypt("中華人民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  加密后的字符數組 
@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 密鑰

 return cipher.doFinal(str.getBytes()); //按單部分操作加密或解密數據，或者結束一個多部分操作。

}
/**


@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 密鑰

 byte[] result = cipher.doFinal(encrypt); //按單部分操作加密或解密數據，或者結束一個多部分操作。
return new String(result);

}




}  </pre>