Companion 0.5.28 (versionCode 48), the companion-agent queue items:
#128 Backup & Restore — the phone side of losing your phone or wiping it
to cross a border. Hub card → SAF export/import of an encrypted .json:
everything the app holds (servers+passwords, FIPS identity/peers, signer
key) sealed in the node's ADR-005 envelope (Argon2id + ChaCha20-Poly1305,
native backup.rs — same blob layout as the node's, node-shaped envelopes
decrypt too). Restore is merge-only: servers upsert npub-first, identity
and signer key adopt only when absent, peers union by npub. No cloud, no
telemetry — the file goes wherever the user saves it.
#139 Remote Signer — the phone IS the NIP-46 bunker. Generate/import a
nostr key, scan a nostrconnect:// QR (in-app scanner or deep link), and
approve/deny each sign_event request from a legible card (kind label,
content, tags, time) — nothing signs without a human. Wire-faithful to
rust-nostr's reference bunker (connect-carrying-secret handshake, NIP-44
v2 transport with NIP-04 receive fallback, kind-24133 responses);
get_public_key/describe/ping handled, everything else 'not authorized'.
Session state in BunkerManager, UI in SignerScreen, hub card wired.
Plus NativeCore (JNI object for the new native surface), FipsPreferences
peers-merge for restore, nostrconnect:// intent filter, and the release
docs (companion-backup-restore.md, companion-nip46-remote-signer.md).
Also Android/tools/nip46-test-client.py: a pure-Python NIP-46 client that
plays the node's login role (QR, handshake, get_public_key, sign_event)
and verifies the phone's signature with an independent BIP-340 — the
end-to-end test for the feature until node-side lands. Its crypto matches
the official NIP-44 + BIP-340 vectors byte-for-byte, the same vectors the
Rust core passes, so the two interop by construction.
Built + smoke: assembleDebug v0.5.28/vc48, same signing cert as the
served 0.5.27 (d622e07e…644d) so it updates in place.
Extends archy-fips-core with the two companion-release features' crypto
(#128, #139), same JNI-over-JSON contract as the mesh surface:
backup.rs — the ADR-005 encrypted-backup envelope, byte-compatible with
the node's backup code (Argon2id default params + ChaCha20-Poly1305,
blob = base64(salt||nonce||ct)); decrypt ignores extra envelope fields
so node backups read here too. Round-trip, tamper, wrong-passphrase and
cross-shape tests included.
nostr.rs — the phone-side remote-signer crypto: nsec/npub bech32 keys,
BIP340 schnorr event signing (NIP-01 id serialization), NIP-44 v2
payloads (HKDF-SHA256 + ChaCha20 + HMAC-SHA256, both padding prefixes),
NIP-04 fallback, nostrconnect:// parsing with repeated relay params.
Verified against the official NIP-44 vectors (conversation keys, message
keys, padded lengths, byte-exact encrypt vectors), the BIP-340 reference
sign vectors, and round-trip/tamper/failure tests. secp256k1 0.29 note:
Keypair::public_key() is the 33-byte compressed key — x-only pubkeys
must go through .x_only_public_key().0 (one real bug the vectors caught).
JNI glue adds com.archipelago.app.NativeCore: backupEncrypt/Decrypt,
nostrGenerateSecret/SecretFromAny/ParseConnectUri/SignEvent and the
NIP-44/NIP-04 cipher pairs. Android arm64 build verified via cargo-ndk
(7.2 MB .so, +0.4 MB for both modules). Host: cargo test 23/23, clippy clean.
Dorian