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[ Python ] Fix timing-safe comparison in verify_finished using hmac.compare_digest

Open-source bounty · GitHub (bounty labels) · open as of 17 Oct 2026

Amount as listed
$1 fixed “$1” — quoted from GitHub (bounty labels)
Platform
GitHub (bounty labels)
Kind of work
Open-source bounty · Engineering
Open to
not stated by the platform
Deadline
not stated by the platform
Status
Open
Checked
17 Oct 2026, 18:22 UTC

What the listing says

Fix verify finished() using == instead of hmac.compare digest() enabling timing attacks - The verify finished() method in python/tls handshake.py at line 237 compares the computed verify data against the received value using return computed verify == received verify — Python's == operator on bytes objects short-circuit

Excerpt we recorded when we checked: Etiketten: 💎 Bounty, good first issue, help wanted, 💎 Bounty, $1, AI Agent friendly, AI only allowed - no humans

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