def decrypt(self, data):
        decoded_data = base64.b64decode(data)
        iv = decoded_data[:AES.block_size]
        cipher = AES.new(self.key, AES.MODE_CBC, iv)
        decrypted = cipher.decrypt(decoded_data[AES.block_size:])
        return decrypted[:-ord(decrypted[1 - len(decrypted):])]
dataset/ETHPy150Open crowdresearch/crowdsource-platform/crowdsourcing/crypto.py/AESUtil.decrypt/swapped operands of `-`