code: public static byte[] hmacSha1(byte[] input, byte[] key) {
  		try {
  			SecretKey secretKey = new SecretKeySpec(key, HMACSHA1_ALG);
  			Mac mac = Mac.getInstance(HMACSHA1_ALG);
  			mac.init(secretKey);
  			return mac.doFinal(input);
  		} catch (GeneralSecurityException e) {
  			throw ExceptionUtil.unchecked(e);
  		}
  	}
docs: 使用HMAC-SHA1进行消息签名, 返回字节数组,长度为20字节.
  
  @param input 原始输入字符数组
  @param key HMAC-SHA1密钥