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19 lines
376 B
Python
19 lines
376 B
Python
5 years ago
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import itertools
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__all__ = ["apply_mask"]
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def apply_mask(data: bytes, mask: bytes) -> bytes:
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"""
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Apply masking to the data of a WebSocket message.
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:param data: Data to mask
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:param mask: 4-bytes mask
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"""
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if len(mask) != 4:
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raise ValueError("mask must contain 4 bytes")
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return bytes(b ^ m for b, m in zip(data, itertools.cycle(mask)))
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