[issue40791] hmac.compare_digest could try harder to be constant-time.

[miss-islington]

Change by miss-islington <mariatta.wijaya+miss-islington at gmail.com>:


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pull_requests: +22623
pull_request: https://github.com/python/cpython/pull/23767

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40791>
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