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32 lines
785 B
Python
32 lines
785 B
Python
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from typing import Tuple
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from Cryptodome.Hash import CMAC
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from Cryptodome.Cipher import AES
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SV2 = "3CC300010080"
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def myCMAC(key: bytes, msg: bytes=b'') -> bytes:
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cobj = CMAC.new(key, ciphermod=AES)
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if msg != b'':
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cobj.update(msg)
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return cobj.digest()
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def decryptSUN(sun: bytes, key: bytes) -> Tuple[bytes, bytes]:
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IVbytes = b"\x00" * 16
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cipher = AES.new(key, AES.MODE_CBC, IVbytes)
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sun_plain = cipher.decrypt(sun)
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UID = sun_plain[1:8]
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counter = sun_plain[8:11]
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return UID, counter
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def getSunMAC(UID: bytes, counter: bytes, key: bytes) -> bytes:
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sv2prefix = bytes.fromhex(SV2)
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sv2bytes = sv2prefix + UID + counter
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mac1 = myCMAC(key, sv2bytes)
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mac2 = myCMAC(mac1)
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return mac2[1::2]
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