ChrisChen/ROLAC
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Author SHA1 Message Date
Chris Chen 85bf329d93 Add Line webhook signature verification helper 
Implements LineSignature.IsValid() using HMAC-SHA256 + FixedTimeEquals to prevent timing attacks; includes xUnit tests for valid, tampered, and null/empty header cases.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
 2026-06-23 19:07:01 -07:00