Sterister
467dd5b065
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Phase D complete. Shade is now at parity with Signal libsignal's core
feature set.
M-Adv 1: Multi-device support (simplified Sesame)
- DeviceListManager tracks per-user device lists ("user:deviceId" addresses)
- fanOutEncrypt() sends one message to all known devices via independent
1:1 Double Ratchet sessions
- observeIncoming() auto-registers new devices from received messages
- JSON serialization for persistence
- userOfDevice/deviceIdOf address parsers
M-Adv 2: Backup and restore
- @shade/sdk exports BackupBlob format: version + salt + nonce + ciphertext
- Passphrase-derived key via HKDF (note: upgrade path to Argon2id documented)
- exportBackup()/importBackup() handle identity, prekeys, sessions, trust
- backupToString/backupFromString for single-string transport (copy/paste, QR)
- shade.exportBackup()/importBackup() convenience methods on SDK
- CLI: shade backup export <file> / shade backup restore <file>
- Rebuilds manager + transport after restore so ratchet state is consistent
M-Adv 3: Group messaging (Sender Keys)
- Per-sender chain key + Ed25519 signing key per group
- createSenderKey / buildDistribution / installDistribution for key distribution
- senderKeyEncrypt advances chain and signs ciphertext+header
- senderKeyDecrypt verifies signature then advances the sender's chain
- Out-of-order handling with bounded skip
- O(1) per message (once distributions are installed)
- Defensive ByteArray copies in distribution to prevent zeroize-across-refs
276 tests passing, 0 failures. All 13 SDK/tooling/platform/advanced
milestones complete. Shade is feature-complete for v2.0.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>