我有一个代码，我做了，但出了问题。我需要encrypty一些文件夹，以获得更多的安全在我的业务，我正在使用的AES脚本在Python。它的生成2个文件，encrypt.py和解密。加密工作很好，但当我执行解密，它给予我一个错误。
下面是我的代码：

import os
from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import padding

backend = default_backend()
key = os.urandom(32)  # 256 bit
iv = os.urandom(16)  # 128 bit

# cryptografy
cipher = Cipher(algorithms.AES(key), modes.CBC(iv), backend=backend)
encryptor = cipher.encryptor()

# loop all files and folders
for root, dirs, files in os.walk('.'):
    # ignores main.py (that is the file name to not encrypt it)
    if 'main.py' in files:
        continue
    # crypt files
    for file in files:
        # create a new encryptor
        cipher = Cipher(algorithms.AES(key), modes.CBC(iv), backend=backend)
        encryptor = cipher.encryptor()

        # read datas
        file_path = os.path.join(root, file)
        data = open(file_path, 'rb').read()

        # adding padding
        padder = padding.PKCS7(128).padder()
        padded_data = padder.update(data) + padder.finalize()

        # encrypts the data
        cipher_data = encryptor.update(padded_data) + encryptor.finalize()

        # writes the encrypted data to the file
        file = open(file_path, 'wb')
        file.write(cipher_data)
        file.close()

# write the code for decryption in the file
decryptor_file = open('decryptor.py', 'w')
decryptor_file.write("import os\n")
decryptor_file.write("from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes\n")
decryptor_file.write("from cryptography.hazmat.backends import default_backend\n")
decryptor_file.write("from cryptography.hazmat.primitives import padding\n\n")

decryptor_file.write("backend = default_backend()\n")
decryptor_file.write("key = \"" + key.hex() + "\"\n")
decryptor_file.write("iv = \"" + iv.hex() + "\"\n\n")

decryptor_file.write("# descryptografy\n")
decryptor_file.write("cipher = Cipher(algorithms.AES(bytes.fromhex(key)), modes.CBC(bytes.fromhex(iv)), backend=backend)\n")
decryptor_file.write("decryptor = cipher.decryptor()\n\n")

decryptor_file.write("# loops all files and folders\n")
decryptor_file.write("for root, dirs, files in os.walk('.'):\n")
decryptor_file.write("    # decrypt files\n")
decryptor_file.write("    for file in files:\n")
decryptor_file.write("        # data reading\n")
decryptor_file.write("        file_path = os.path.join(root, file)\n")
decryptor_file.write("        data = open(file_path, 'rb').read()\n\n")

decryptor_file.write("        # decrypt data \n")
decryptor_file.write("        decrypted_data = decryptor.update(data) + decryptor.finalize()\n\n")

decryptor_file.write("        # remove padding\n")
decryptor_file.write("        unpadder = padding.PKCS7(128).unpadder()\n")
decryptor_file.write("        unpadded_data = unpadder.update(decrypted_data) + unpadder.finalize()\n\n")

decryptor_file.write("        # writes the data descrypted in the file\n")
decryptor_file.write("        file = open(file_path, 'wb')\n")
decryptor_file.write("        file.write(unpadded_data)\n")
decryptor_file.write("        file.close()\n\n")

decryptor_file.close()

# shows a alert message
print('All files and folders have been encrypted and the decrypt file has been created!')

我得到的错误：

Traceback (most recent call last):
  File "C:\Users\User\Desktop\cryptor\decryptor.py", line 23, in <module>
    decrypted_data = decryptor.update(data) + decryptor.finalize()
  File "C:\Program Files\Python38\lib\site-packages\cryptography\hazmat\primitives\ciphers\base.py", line 186, in finalize
    data = self._ctx.finalize()
  File "C:\Program Files\Python38\lib\site-packages\cryptography\hazmat\backends\openssl\ciphers.py", line 223, in finalize
    raise ValueError(
ValueError: The length of the provided data is not a multiple of the block length.

一些帮助是感激的！