code: def get_sha1_signature(token, timestamp, nonce, encrypt):
      
  
      try:
          sortlist = [token, timestamp, nonce, to_binary(encrypt)]
          sortlist.sort()
          sha = hashlib.sha1()
          sha.update(to_binary("").join(sortlist))
          return sha.hexdigest()
      except Exception as e:
          raise CryptoComputeSignatureError(e)
docs: 用 SHA1 算法生成安全签名
      @param token: 票据
      @param timestamp: 时间戳
      @param encrypt: 密文
      @param nonce: 随机字符串
      @return: 安全签名