feat: implement PIN authentication with PBKDF2-SHA256 #46
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- Create lib/auth.ts with PIN hashing and validation functions - Use PBKDF2-SHA256 with 100,000 iterations for secure hashing - Implement generateSalt() for 16-byte cryptographic salt generation - Implement hashPin() with proper error handling and validation - Implement validatePin() with constant-time comparison to prevent timing attacks - Implement validatePinStrength() to enforce PIN requirements (4-20 chars, letters + numbers) - Add generateRandomPin() utility for generating secure test PINs - Create comprehensive test suite with 30 unit tests covering all functions - Ensure edge runtime compatibility for Cloudflare Workers - Update TODO.md to mark PIN authentication tasks as completed Closes #38 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
This was referenced Jun 6, 2025
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Summary
lib/auth.tswith comprehensive PIN hashing and validation functionalityChanges
PIN Authentication Module (
lib/auth.ts)generateSalt()- Generates cryptographically secure 16-byte salthashPin()- Hashes PIN using PBKDF2-SHA256 with 100,000 iterationsvalidatePin()- Validates PIN with constant-time comparison to prevent timing attacksvalidatePinStrength()- Enforces PIN requirements (4-20 chars, must contain letters and numbers)generateRandomPin()- Utility for generating secure test PINsSecurity Features
Test Coverage
lib/auth.test.tsTechnical Details
Related Issue
Closes #38
🤖 Generated with Claude Code