[3.14] gh-136912: fix handling of OverflowError in hmac.digest (GH-136917)
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…st` (pythonGH-136917) The OpenSSL and HACL* implementations of HMAC single-shot digest computation reject keys whose length exceeds `INT_MAX` and `UINT32_MAX` respectively. The OpenSSL implementation also rejects messages whose length exceed `INT_MAX`. Using such keys in `hmac.digest` previously raised an `OverflowError` which was propagated to the caller. This commit mitigates this case by making `hmac.digest` fall back to HMAC's pure Python implementation which accepts arbitrary large keys or messages. This change only affects the top-level entrypoint `hmac.digest`, leaving `_hashopenssl.hmac_digest` and `_hmac.compute_digest` untouched. (cherry picked from commit d658b90) Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
This was referenced Jul 26, 2025
gpshead
approved these changes
Jul 27, 2025
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waiting for 3.14.1 |
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The OpenSSL and HACL* implementations of HMAC single-shot digest computation reject keys whose length exceeds
INT_MAXandUINT32_MAXrespectively. The OpenSSL implementation also rejects messages whose length exceedINT_MAX.Using such keys in
hmac.digestpreviously raised anOverflowErrorwhich was propagated to the caller. This commit mitigates this case by makinghmac.digestfall back to HMAC's pure Python implementation which accepts arbitrary large keys or messages.This change only affects the top-level entrypoint
hmac.digest, leaving_hashopenssl.hmac_digestand_hmac.compute_digestuntouched.(cherry picked from commit d658b90)