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
2026-06-23 17:12:17 -07:00
2026-06-23 17:12:17 -07:00
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