Add PIN attempt limiting with PBKDF2 key stretching#135

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wksantiago wants to merge 3 commits intomainfrom

PIN-attempt-limiting

Commits on Jan 23, 2026

Add PIN attempt limiting with PBKDF2 key stretching
wksantiago
committed

Commits on Jan 24, 2026

Fix HMAC key source, rate limit reboot bypass, and delay schedule
wksantiago
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Fix 64-bit overflow, HMAC error propagation, and clang-format
wksantiago
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