[issue19259] Provide Python implementation of operator.compare_digest()

[Antoine Pitrou]

Antoine Pitrou added the comment:

It explains why the function isn't implemented in Python, it doesn't say that there shouldn't be a best-effort Python fallback.

All in all, Christian's version looks reasonable. All arithmetic is done on small ints, so there shouldn't be a strong data-dependent timing issue.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19259>
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