crypto.py 文件源码

def decrypt(self, ctext):
        iv = ctext[:AES_BLOCK_SIZE]
        ctext = ctext[AES_BLOCK_SIZE:]
        cipher = Cipher(algorithms.AES(self.cipher_key), modes.CBC(iv), backend=default_backend())
        unpadder = padding.PKCS7(AES_BLOCK_SIZE * 8).unpadder()
        decryptor = cipher.decryptor()

        data = decryptor.update(ctext) + decryptor.finalize()
        return unpadder.update(data) + unpadder.finalize()