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48 lines
1.5 KiB
Python
48 lines
1.5 KiB
Python
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"""Original implementation of the TP-Link Smart Home protocol."""
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import struct
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from typing import Generator
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class OriginalTPLinkSmartHomeProtocol:
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"""Original implementation of the TP-Link Smart Home protocol."""
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INITIALIZATION_VECTOR = 171
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@staticmethod
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def _xor_payload(unencrypted: bytes) -> Generator[int, None, None]:
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key = OriginalTPLinkSmartHomeProtocol.INITIALIZATION_VECTOR
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for unencryptedbyte in unencrypted:
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key = key ^ unencryptedbyte
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yield key
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@staticmethod
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def encrypt(request: str) -> bytes:
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"""Encrypt a request for a TP-Link Smart Home Device.
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:param request: plaintext request data
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:return: ciphertext to be send over wire, in bytes
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"""
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plainbytes = request.encode()
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return struct.pack(">I", len(plainbytes)) + bytes(
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OriginalTPLinkSmartHomeProtocol._xor_payload(plainbytes)
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)
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@staticmethod
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def _xor_encrypted_payload(ciphertext: bytes) -> Generator[int, None, None]:
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key = OriginalTPLinkSmartHomeProtocol.INITIALIZATION_VECTOR
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for cipherbyte in ciphertext:
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plainbyte = key ^ cipherbyte
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key = cipherbyte
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yield plainbyte
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@staticmethod
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def decrypt(ciphertext: bytes) -> str:
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"""Decrypt a response of a TP-Link Smart Home Device.
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:param ciphertext: encrypted response data
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:return: plaintext response
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"""
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return bytes(
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OriginalTPLinkSmartHomeProtocol._xor_encrypted_payload(ciphertext)
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).decode()
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