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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>
81 lines
3.1 KiB
Dart
81 lines
3.1 KiB
Dart
import 'composer_send_origin.dart';
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import 'dart:async';
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import 'dart:collection';
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import 'dart:io';
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import 'dart:math' as math;
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import 'dart:ui' show FlutterView;
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import 'package:camera/camera.dart' as camera;
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import 'package:flutter/foundation.dart';
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import 'package:flutter/material.dart';
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import 'package:flutter/physics.dart';
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import 'package:flutter/rendering.dart';
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import 'package:flutter/services.dart';
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import 'package:flutter_hooks/flutter_hooks.dart';
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import 'package:hooks_riverpod/hooks_riverpod.dart';
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import 'package:image_picker/image_picker.dart';
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import 'package:buzz/shared/theme/buzz_icons.dart';
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import 'package:nostr/nostr.dart' as nostr;
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import '../../shared/mentions/agent_identity_provider.dart';
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import '../../shared/mentions/mention_bindings.dart';
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import '../../shared/mentions/mention_rules.dart';
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import '../../shared/huddle/huddle_session.dart';
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import '../../shared/relay/relay.dart';
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import '../../shared/theme/theme.dart';
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import '../../shared/widgets/avatar_image.dart';
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import '../../shared/widgets/anchored_popover_menu.dart';
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import '../../shared/widgets/buzz_loading_indicator.dart';
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import '../../shared/widgets/concentric_sheet_surface.dart';
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import '../../shared/widgets/keyboard_dismiss_on_drag.dart';
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import '../../shared/widgets/ios_glass_navigation_button.dart';
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import '../../shared/widgets/mobile_tab_footer_backdrop.dart';
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import '../../shared/widgets/modal_presentation.dart';
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import '../../shared/profile/user_cache_provider.dart';
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import '../../shared/profile/user_profile.dart';
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import '../../shared/custom_emoji/custom_emoji.dart';
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import '../../shared/custom_emoji/custom_emoji_provider.dart';
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import '../../shared/deeplink/deep_link.dart';
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import '../activity/compose_drafts_provider.dart';
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import 'camera_capture_cleanup.dart';
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import 'channel.dart';
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import 'channel_management_provider.dart';
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import 'channels_provider.dart';
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import 'emoji_picker.dart';
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import 'mentions/mention_candidates.dart';
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import 'mentions/mention_candidates_provider.dart';
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import 'mentions/mention_ranking.dart';
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import 'photo_library.dart';
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import 'voice_note_attachment.dart';
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import 'voice_note_composer_recorder.dart';
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import 'voice_note_recording.dart';
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import 'package:buzz/shared/crypto/event_signing.dart';
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part 'compose_bar/helpers.dart';
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part 'compose_bar/agent_mention_labels.dart';
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part 'compose_bar/markdown_editing_controller.dart';
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part 'compose_bar/draft_lifecycle.dart';
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part 'compose_bar/suggestions.dart';
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part 'compose_bar/mention_chooser.dart';
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part 'compose_bar/formatting_toolbar.dart';
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part 'compose_bar/attachments.dart';
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part 'compose_bar/upload_progress_pill.dart';
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part 'compose_bar/photo_gallery_picker.dart';
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part 'compose_bar/ios_photo_picker.dart';
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part 'compose_bar/ios_attachment_popover.dart';
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part 'compose_bar/camera_preview.dart';
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part 'compose_bar/send_button.dart';
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part 'compose_bar/voice_note.dart';
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part 'compose_bar/layout.dart';
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part 'compose_bar/dock.dart';
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part 'compose_bar/compose_bar_widget.dart';
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/// Callback used by channels and threads to submit composer content.
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typedef ComposeBarOnSend =
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Future<void> Function(
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String content,
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List<String> mentionPubkeys, {
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List<List<String>> mediaTags,
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});
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