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Title: bpo-40791: Make compare_digest more constant-time. by ssbr · Pull Request #20444 · python/cpython · GitHub

Open Graph Title: bpo-40791: Make compare_digest more constant-time. by ssbr · Pull Request #20444 · python/cpython

X Title: bpo-40791: Make compare_digest more constant-time. by ssbr · Pull Request #20444 · python/cpython

Description: The existing volatile left/right pointers guarantee that the reads will all occur, but does not guarantee that they will be used. So a compiler can still short-circuit the loop, saving e.g. the ove...

Open Graph Description: The existing volatile left/right pointers guarantee that the reads will all occur, but does not guarantee that they will be used. So a compiler can still short-circuit the loop, saving e.g. the ove...

X Description: The existing volatile left/right pointers guarantee that the reads will all occur, but does not guarantee that they will be used. So a compiler can still short-circuit the loop, saving e.g. the ove...

Opengraph URL: https://github.com/python/cpython/pull/20444

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Mar 13, 2021 https://github.com/python/cpython/pull/20444#ref-commit-d5c3448
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bpo-40791: Make compare_digest more constant-time. (https://github.com/adorilson/cpython/commit/d5c34486c321b3c9c0f92d8df7614f266d01a031
pythonGH-20444https://github.com/python/cpython/pull/20444
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https://github.com/python/cpython/pull/20444
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Aug 24, 2023 https://github.com/python/cpython/pull/20444#ref-issue-1199037413
hmac.compare_digest could try harder to be constant-time. #84968 https://github.com/python/cpython/issues/84968
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