Feature/tip message encryption#416
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Implementation
Core Encryption Infrastructure:
RSA-OAEP encryption utility with Web Crypto API
Public key registry for storing recipient keys
useEncryption hook for key management
Local storage for encryption keys
UI Components: 5. Encryption toggle in SendTip component with lock/unlock icons 6. Message decryption in TipHistory with reveal/hide functionality 7. EncryptionSettings page for key management 8. Visual indicators for encrypted messages
Testing: 9. 26 tests for encryption utilities 10. 19 tests for public key registry 11. 19 tests for useEncryption hook 12. All tests passing (64 total tests)
Integration: 13. Added encryption route to navigation 14. Updated routes configuration 15. Integrated with existing components
Features Delivered
Encryption/Decryption:
RSA-OAEP 2048-bit encryption
Automatic key generation and storage
Encrypt messages before sending tips
Decrypt received encrypted messages
UI/UX:
Optional encryption toggle in message field
Lock icon indicates encrypted messages
Click to decrypt in tip history
Visual feedback for encryption status
Recipient key availability check
Key Management:
Keys stored locally in browser
Public key sharing capability
Key regeneration option
Encryption settings page
Backward Compatibility:
Unencrypted messages still work
Graceful fallback when keys unavailable
No breaking changes to existing functionality
Acceptance Criteria Met
✅ Encryption/decryption implementation in frontend
✅ UI toggle for encrypted messages
✅ Key management for user wallets
✅ Backward compatibility with unencrypted messages
✅ Tests for encryption functionality
Closes #386