[Security] Hard-coded IV on AES CBC Encryption

[spblue4422]

Hi, while I'm reviewing your code, I noticed that you're using hard-coded key on AES encryption.

awesome-python-login-model/NeteaseCloudMusicDownload/api.py

Lines 32 to 40 in b458a09

	def aes_encrypt(self, text, key):
	iv = b'0102030405060708'
	pad = 16 - len(text.encode()) % 16
	text = text + pad * chr(pad)
	# fix: https://github.com/Kr1s77/awesome-python-login-model/issues/100#issuecomment-673897848
	# error: TypeError: Object type <class 'str'> cannot be passed to C code
	encryptor = AES.new(key.encode(), AES.MODE_CBC, iv)
	msg = base64.b64encode(encryptor.encrypt(text.encode()))
	return msg

When using AES CBC encryption, IV should be used random value for secure usage.

Update for this would be significantly helpful to security.
We would appreciate it if you could review the code and proceed with the update if it is deemed insecure.

Thank you.