39 lines
1.3 KiB
Python
39 lines
1.3 KiB
Python
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import bitstring
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# Reference for H10301 card format:
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# https://www.hidglobal.com/sites/default/files/hid-understanding_card_data_formats-wp-en.pdf
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class Credential:
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def __init__(self, code=None, hex=None):
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if code is None and hex is None:
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raise TypeError("Must set either code or hex for a Credential")
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elif code is not None and hex is not None:
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raise TypeError("Cannot set both code and hex for a Credential")
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elif code is not None:
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self.bits = bitstring.pack(
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'0b000000, 0b0, uint:8=facility, uint:16=number, 0b0',
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facility=code[0], number=code[1])
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self.bits[6] = self.bits[7:19].count(1) % 2 # even parity
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self.bits[31] = not (self.bits[19:31].count(1) % 2) # odd parity
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elif hex is not None:
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self.bits = bitstring.Bits(hex=hex)
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def __repr__(self):
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return f"Credential({self.code})"
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def __eq__(self, other):
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return self.bits == other.bits
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def __hash__(self):
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return self.bits.int
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@property
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def code(self):
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facility = self.bits[7:15].uint
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code = self.bits[15:31].uint
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return (facility, code)
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@property
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def hex(self):
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return self.bits.hex.upper()
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