decryptFile.py

def decrypt(dataFile, privateKeyFile):
    '''
    use EAX mode to allow detection of unauthorized modifications
    '''

    # read private key from file
    with open(privateKeyFile, 'rb') as f:
        privateKey = f.read()
        # create private key object
        key = RSA.import_key(privateKey)

    # read data from file
    with open(dataFile, 'rb') as f:
        # read the session key
        encryptedSessionKey, nonce, tag, ciphertext = [ f.read(x) for x in (key.size_in_bytes(), 16, 16, -1) ]

    # decrypt the session key
    cipher = PKCS1_OAEP.new(key)
    sessionKey = cipher.decrypt(encryptedSessionKey)

    # decrypt the data with the session key
    cipher = AES.new(sessionKey, AES.MODE_EAX, nonce)
    data = cipher.decrypt_and_verify(ciphertext, tag)

    # save the decrypted data to file
    [ fileName, fileExtension ] = dataFile.split('.')
    decryptedFile = fileName + '_decrypted.' + fileExtension
    with open(decryptedFile, 'wb') as f:
        f.write(data)

    print('Decrypted file saved to ' + decryptedFile)

don't work what to do please?