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    HMAC£¨Hash Message Authentication Code£¬É¢ÁÐÏûÏ¢¼ø±ðÂ룬»ùÓÚÃÜÔ¿µÄHashËã·¨µÄÈÏ֤ЭÒé¡£ÏûÏ¢¼ø±ðÂëʵÏÖ¼ø±ðµÄÔ­ÀíÊÇ£¬Óù«¿ªº¯ÊýºÍÃÜÔ¿²úÉúÒ»¸ö¹Ì¶¨³¤¶ÈµÄÖµ×÷ΪÈÏÖ¤±êʶ£¬ÓÃÕâ¸ö±êʶ¼ø±ðÏûÏ¢µÄÍêÕûÐÔ¡£Ê¹ÓÃÒ»¸öÃÜÔ¿Éú³ÉÒ»¸ö¹Ì¶¨´óСµÄСÊý¾Ý¿é£¬¼´MAC£¬²¢½«Æä¼ÓÈëµ½ÏûÏ¢ÖУ¬È»ºó´«Êä¡£½ÓÊÕ·½ÀûÓÃÓë·¢ËÍ·½¹²ÏíµÄÃÜÔ¿½øÐмø±ðÈÏÖ¤µÈ¡£
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/** *//**  
 * ³õʼ»¯HMACÃÜÔ¿  http://www.guihua.org  http://www.feng123.com
 *   
 * @return  
 * @throws Exception  
 */  
public static String initMacKey() throws Exception {   
    KeyGenerator keyGenerator = KeyGenerator.getInstance(KEY_MAC);   
  
    SecretKey secretKey = keyGenerator.generateKey();   
    return encryptBASE64(secretKey.getEncoded());   
}   
  
/** *//**  
 * HMAC¼ÓÃÜ  
 *   
 * @param data  
 * @param key  
 * @return  
 * @throws Exception  
 */  
public static byte[] encryptHMAC(byte[] data, String key) throws Exception {   
  
    SecretKey secretKey = new SecretKeySpec(decryptBASE64(key), KEY_MAC);   
    Mac mac = Mac.getInstance(secretKey.getAlgorithm());   
    mac.init(secretKey);   
  
    return mac.doFinal(data);   
  

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