微信退款通知ase信息解碼

package com.mmall.util;

import java.security.Security;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.binary.Base64;
import org.apache.commons.codec.digest.DigestUtils;
import org.bouncycastle.jce.provider.BouncyCastleProvider;

public class AESUtils {

    public static final String ALGORITHM = "AES/ECB/PKCS7Padding"; 
    
    
    public static String encode(String data,String key) throws Exception{
        Security.addProvider(new BouncyCastleProvider());
        String md5Key = DigestUtils.md5Hex(key).toLowerCase();
        SecretKeySpec keySpec = new SecretKeySpec(md5Key.getBytes(), "AES");
        Cipher cipher = Cipher.getInstance(ALGORITHM);
        cipher.init(Cipher.ENCRYPT_MODE, keySpec);
        byte[] encode = Base64.encodeBase64(cipher.doFinal(data.getBytes()));
        return new String(encode,"UTF-8");
    }
    
    
    public static String decode(String data,String key) throws Exception{
       byte[] decodeBase64 = Base64.decodeBase64(data);
       String md5Key = DigestUtils.md5Hex(key).toLowerCase();
       Security.addProvider(new BouncyCastleProvider());
       Cipher cipher = Cipher.getInstance(ALGORITHM);  
       SecretKey keySpec = new SecretKeySpec(md5Key.getBytes(), "AES"); //生成加密解密需要的Key  
       cipher.init(Cipher.DECRYPT_MODE, keySpec);  
       byte[] decoded = cipher.doFinal(decodeBase64);  
       return new String(decoded, "UTF-8");  
    }
    
}