mirror of
https://github.com/block/buzz.git
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4ff02bf03b
Mobile signs every Nostr event (sends, relay AUTH, media auth headers, preference writes) in pure Dart on the UI isolate. On an iPhone SE (2nd gen, Profile build) one BIP-340 signature costs about 10.7 ms and deriving the public key another 5.6 ms, so a burst of signed writes drops frames. This adds `mobile/packages/buzz_secp256k1`, a small FFI package that builds vendored bitcoin-core/libsecp256k1 v0.8.0 (ecdh, extrakeys, schnorrsig modules) through a Dart build hook, so the same C and the same Dart API ship on iOS and Android with no platform bridge code. All 13 `nostr.Event.from` signing sites now go through `signNostrEvent`, which keeps the `nostr` package's event-id serialization and moves only key derivation and signing to native code. Calls stay synchronous. The package also exposes `schnorrVerify` and `ecdhX`; follow-up PRs move verification and the NIP-44 conversation key over. Incoming relay events are still not verified, unchanged by this PR. Safety: the signing context is randomized once per isolate, secret keys and keypairs are wiped from the native scratch buffer after each call, aux randomness comes from `Random.secure()`, and the static verify context runs libsecp256k1's self test before first use. ### Validation - Added tests: BIP-340 official vectors and native-vs-pure-Dart differential tests in the package; `event_signing_test.dart` signs with 64 random keys and checks pubkey, event id and signature against the existing `nostr` builder and verifier, plus malformed-key rejection. - Full mobile analyze and test suite pass locally. - Builds: iOS release (framework ~1.3 MB) and Android debug APK with the library for arm64-v8a, armeabi-v7a and x86_64 (~1.2–1.3 MB each). - On-device (iPhone SE 2nd gen, Profile, median per op): sign 10,736 µs → 41 µs, derive pubkey 5,580 µs → 16.5 µs, full signed event 10,744 µs → 65 µs. Event-id JSON and SHA-256 are 23 µs, so they stay in Dart. - Device, iOS (iPhone SE 2nd gen, Profile): `buzz_secp256k1.framework` embedded; the signed-in app authenticated to a real community relay, loaded channels and history, and paged older messages. No native-asset or secp256k1 errors in the console. - Device, Android (emulator, debug): APK contains `libbuzz_secp256k1.so` and loads it. Against a local mock relay that verifies with the pure-Dart `nostr` package, the app's NIP-42 AUTH, NIP-98 `POST /query` headers, and kind 20001/30078 events all verified. - Blossom GET auth, iOS: the dev relay returns 401 for unauthenticated `/media/` GETs. From inside the running app, the production `MediaGetAuthService.headersFor()` header for a nonexistent hash got 404 (accepted, file missing), compared with 401 without it. The community has no relay-hosted image, so none was rendered. buzz-review-completed (agent review, Codex and security review clean; device validation above; human app test not applicable under the mobile testing exception) 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Signed-off-by: Tom Brow <tomb@block.xyz> Co-authored-by: george <973be878edd6d4f79692a3827f20a6f7fe0ed0362f269ff6b6ba8867033d7d8e@sprout-oss.stage.blox.sqprod.co> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
98 lines
2.5 KiB
YAML
98 lines
2.5 KiB
YAML
name: buzz
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description: Buzz mobile client
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publish_to: 'none'
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version: 0.0.0+1
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environment:
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sdk: ^3.11.4
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flutter: ">=3.47.7"
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dependencies:
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flutter:
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sdk: flutter
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cupertino_icons: ^1.0.8
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# Grapheme-cluster segmentation, for deciding whether a message body is
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# nothing but emoji. Already present transitively via the Flutter SDK;
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# declared here because we import it directly.
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characters: ^1.4.0
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hooks_riverpod: ^3.0.3
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flutter_hooks: ^0.21.3
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http: ^1.4.0
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crypto: ^3.0.7
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flutter_secure_storage: ^10.0.0
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flutter_svg: ^2.2.4
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mobile_scanner: ^7.0.0
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shared_preferences: ^2.5.5
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web_socket_channel: ^3.0.1
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connectivity_plus: ^7.0.0
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nostr: ^2.0.0
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buzz_secp256k1:
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path: packages/buzz_secp256k1
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pointycastle: ^4.0.0
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url_launcher: ^6.3.2
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gpt_markdown: ^1.2.1
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highlight: ^0.7.0
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intl: ^0.20.2
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uuid: ^4.5.1
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file_selector: ^1.1.0
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camera: ^0.12.0+2
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image_picker: ^1.1.2
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image: ^4.8.0
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google_mlkit_selfie_segmentation: ^0.11.0
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photo_manager: ^3.11.0
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video_player: ^2.10.1
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just_audio: ^0.10.6
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record: ^6.2.1
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package_info_plus: ^10.0.0
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app_badge_plus: ^1.2.10
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app_links: ^6.4.0
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scrollable_positioned_list: ^0.3.8
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open_filex: ^4.7.0
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path_provider: ^2.1.6
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share_plus: ^13.3.0
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local_auth: ^3.0.2
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dev_dependencies:
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leak_tracker: ^11.0.2
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shared_preferences_platform_interface: ^2.4.2
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flutter_test:
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sdk: flutter
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flutter_lints: ^6.0.0
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fake_async: ^1.3.3
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camera_platform_interface: ^2.13.1
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custom_lint: ^0.8.0
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riverpod_lint: ^3.1.0
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mocktail: ^1.0.4
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# Test-only platform interface fakes (depend_on_referenced_packages).
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path_provider_platform_interface: ^2.1.2
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plugin_platform_interface: ^2.1.8
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video_player_platform_interface: ^6.6.0
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flutter:
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config:
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enable-swift-package-manager: false
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uses-material-design: true
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shaders:
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- shaders/onboarding_wordmark.frag
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assets:
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- assets/images/buzz-icon.png
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- assets/images/shell-gradient.png
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- assets/images/buzz-wordmark.png
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# Generated by `just mobile-emoji-data` from the same emoji-mart dataset
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# desktop uses. Do not hand-edit.
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- assets/emoji/emoji-data.json
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fonts:
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- family: BuzzTabler
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fonts:
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- asset: assets/fonts/TablerIcons.ttf
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- family: Inter
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fonts:
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- asset: assets/fonts/InterVariable.ttf
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- asset: assets/fonts/InterVariable-Italic.ttf
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style: italic
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- family: GeistMono
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fonts:
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- asset: assets/fonts/GeistMono-Variable.ttf
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- asset: assets/fonts/GeistMono-Italic-Variable.ttf
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style: italic
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