Fix issue with authenticator token

[epenet]

No description provided.

[epenet]

I wrongly assumed that the py3rijndael public library matched the folder in PySmartCrypto, but that is not the case!

Public library has: https://github.com/meyt/py3rijndael/blob/3c2a6a3776b38b1f988b3c9148b3bca3c89f3112/py3rijndael/constants.py#L7-L11

num_rounds = {
    16: {16: 10, 24: 12, 32: 14},
    24: {16: 12, 24: 12, 32: 14},
    32: {16: 14, 24: 14, 32: 14}
}

PySmartCrypto has: https://github.com/sermayoral/ha-samsungtv-encrypted/blob/da0f13fe3bcffc834e84fb0d46b8d9066bb2681e/custom_components/samsungtv_encrypted/PySmartCrypto/py3rijndael/constants.py#L7-L9

num_rounds = {
    16: {16: 3}
}

[epenet]

We need to adjust

samsung-tv-ws-api/samsungtvws/encrypted/authenticator.py

Lines 48 to 52 in 3b8bcf1

	def _apply_samy_go_key_transform(data: bytes) -> bytes:
	cipher = Cipher(algorithms.AES(bytes.fromhex(TRANS_KEY)), modes.ECB())
	encryptor: CipherContext = cipher.encryptor()
	return encryptor.update(data) + encryptor.finalize() # type:ignore[no-any-return]

but I am not sure how yet.

[epenet]

I couldn't find a way to use cryptography for the _apply_samy_go_key_transform routine.
I decided instead to add a dependency to py3rijndael, and override the __init__ method accordingly.

If there is a better way to do this I'm all ears...

[epenet]

It was difficult, but @sermayoral confirmed it was working.

@xchwarze could you publish a release when you get a chance please?

[xchwarze]

@epenet ok!