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PHASE0-SUMMARY.md

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Phase 0 Complete - Quick Reference

Date: 2025-10-19 Duration: ~4 hours (estimated 2-3 days) Status: ✅ COMPLETE - GO DECISION

🎉 TL;DR

Phase 0 crypto spike is COMPLETE. All tests passed. Proceed with Expo migration.

✅ What Was Validated

  1. X25519 Key Generation - Working ✅
  2. ECDH Key Exchange - Working ✅
  3. AES-256-GCM Encryption - Working ✅
  4. HKDF-SHA256 Key Derivation - Working ✅
  5. Utterd Compatibility - Matches perfectly ✅
  6. Performance - <10ms per operation ✅

📦 Technology Stack (Validated)

{
  "tweetnacl": "^1.0.3",                // X25519 key gen & ECDH (pure JS)
  "tweetnacl-util": "^0.15.1",          // Base64 encoding
  "react-native-quick-crypto": "^0.7",  // AES-GCM, HKDF (Node.js crypto)
  "expo-crypto": "~15.0.7"              // Random bytes
}

📁 Key Files

crypto-spike/
├── CryptoTest-AES-GCM.ts      ⭐ Production crypto module
├── test-aes-gcm.ts            ✅ All tests passing
├── PHASE0-RESULTS.md          📊 Detailed results
└── PHASE0-DECISION.md         ✅ GO decision rationale

🚀 Next Steps

Ready to proceed to Phase 1:

  1. Create mobile-app/ directory
  2. Set up Expo project with TypeScript
  3. Install dependencies (use pnpm, managed by mise)
  4. Copy crypto-spike/CryptoTest-AES-GCM.ts as crypto module
  5. Set up React Navigation

Command Reference:

# Use pnpm (NOT npm) for all package management
pnpm add <package>        # Add dependency
pnpm add -D <package>     # Add dev dependency
pnpm install              # Install all dependencies

# Use mise for toolchain management
mise use -g node@20       # Set Node.js version
mise use -g pnpm@8        # Set pnpm version

⚠️ Important Notes

  1. Use pnpm, not npm - Consistent with relay-server and linux-test-client
  2. Use mise for toolchain - Manages Node.js and pnpm versions
  3. AES-256-GCM is the chosen algorithm - Matches utterd exactly
  4. Development build required - Not Expo Go (due to react-native-quick-crypto)
  5. Crypto module ready - Copy from crypto-spike/CryptoTest-AES-GCM.ts

📊 Decision Summary

GO Decision Confidence: 95% (Very High)

Rationale:

  • All crypto primitives working perfectly ✅
  • Matches utterd implementation exactly ✅
  • No changes needed to relay server or utterd ✅
  • Performance excellent (<10ms) ✅
  • Clear implementation path ✅
  • No showstoppers identified ✅

📖 Full Documentation

  • docs/EXPO.md - Complete migration plan (updated with Phase 0 results)
  • crypto-spike/PHASE0-DECISION.md - Detailed GO/NO-GO decision
  • crypto-spike/PHASE0-RESULTS.md - Test results and findings

Ready to start Phase 1? Let's go! 🚀