67 lines
1.7 KiB
Python
67 lines
1.7 KiB
Python
import base64
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from enum import Enum
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from uuid import UUID
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from typing import Union
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class Key:
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class KeyType(Enum):
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INVALID = 0x0000
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AES_128_CTR = 0x0001
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RC4_CIPHER = 0x0002
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AES_128_ECB = 0x0003
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COCKTAIL = 0x0004
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AES_128_CBC = 0x0005
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UNKNOWN = 0xffff
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@classmethod
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def _missing_(cls, value):
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return cls.UNKNOWN
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class CipherType(Enum):
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INVALID = 0x0000
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RSA_1024 = 0x0001
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CHAINED_LICENSE = 0x0002
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ECC_256 = 0x0003
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ECC_256_WITH_KZ = 0x0004
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SCALABLE = 0x0005
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UNKNOWN = 0xffff
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@classmethod
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def _missing_(cls, value):
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return cls.UNKNOWN
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def __init__(
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self,
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key_id: UUID,
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key_type: int,
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cipher_type: int,
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key_length: int,
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key: bytes
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):
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self.key_id = key_id
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self.key_type = self.KeyType(key_type)
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self.cipher_type = self.CipherType(cipher_type)
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self.key_length = key_length
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self.key = key
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@staticmethod
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def kid_to_uuid(kid: Union[str, bytes]) -> UUID:
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"""
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Convert a Key ID from a string or bytes to a UUID object.
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At first, this may seem very simple, but some types of Key IDs
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may not be 16 bytes and some may be decimal vs. hex.
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"""
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if isinstance(kid, str):
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kid = base64.b64decode(kid)
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if not kid:
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kid = b"\x00" * 16
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if kid.decode(errors="replace").isdigit():
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return UUID(int=int(kid.decode()))
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if len(kid) < 16:
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kid += b"\x00" * (16 - len(kid))
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return UUID(bytes=kid)
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