disable transport test

* AES-GSM encryption with padding

* RSA-OAEP encryption and key generation

* SPKI encoding/decoding RSA public keys

* rename functions

* encode/decode RSA keys using asn1lib library

* remove poitycastle namespace

* remove unnecessary typecheck

* fix: ci

Co-authored-by: alex <alex@tekartik.com>

.github/workflows/build_haskell.yml

@@ -7,7 +7,13 @@ on:
       - v5
     tags:
       - "v*"
+    paths:
+      - haskell/**
+      - .github/workflows/build_haskell.yml
   pull_request:
+    paths:
+      - haskell/**
+      - .github/workflows/build_haskell.yml
 
 jobs:
   prepare-release:

.github/workflows/ci_dart.yml

@@ -0,0 +1,32 @@
+name: Run CI
+on:
+  push:
+  workflow_dispatch:
+  schedule:
+    - cron: '0 0 * * 0'  # every sunday at midnight
+
+jobs:
+  test:
+    name: Test on ${{ matrix.os }} / ${{ matrix.flutter }}
+    runs-on: ${{ matrix.os }}
+    defaults:
+      run:
+        working-directory: packages/repo_support
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+        flutter: [stable, beta, dev]
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-java@v1
+        with:
+          java-version: '12.x'
+      - uses: subosito/flutter-action@v1
+        with:
+          channel: ${{ matrix.flutter }}
+      - run: flutter --version
+      - run: flutter upgrade
+      - run: dart --version
+      - run: dart pub get
+      - run: dart run tool/run_ci.dart

.gitignore

@@ -43,9 +43,54 @@ cabal.project.local~
 *.cabal
 stack.yaml.lock
 
-# Idris
-*.ibc
-
 # chat database
 *.db
 *.db.bak
+
+# Misc
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
+
+# IntelliJ
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# VS Code
+.vscode/
+
+# Flutter/Dart/Pub
+**/doc/api/
+**/ios/Flutter/.last_build_id
+.dart_tool/
+.flutter-plugins
+.flutter-plugins-dependencies
+.packages
+.pub-cache/
+.pub/
+build/
+# Default behavior, only keep it for apps
+pubspec.lock
+
+# Web
+lib/generated_plugin_registrant.dart
+
+# Symbolication
+app.*.symbols
+
+# Obfuscation
+app.*.map.json
+
+# Android Studio build artifacts
+/android/app/debug
+/android/app/profile
+/android/app/release
+

packages/analysis_options.yaml

@@ -0,0 +1,44 @@
+include: package:lints/recommended.yaml
+
+linter:
+  rules:
+    prefer_single_quotes: true
+    constant_identifier_names: false
+    always_declare_return_types: true   
+    avoid_dynamic_calls: true
+    avoid_empty_else: true
+    avoid_relative_lib_imports: true
+    avoid_shadowing_type_parameters: true
+    avoid_slow_async_io: true
+    avoid_types_as_parameter_names: true
+    await_only_futures: true
+    camel_case_extensions: true
+    camel_case_types: true
+    cancel_subscriptions: true
+    curly_braces_in_flow_control_structures: true
+    directives_ordering: true
+    empty_catches: true
+    hash_and_equals: true
+    iterable_contains_unrelated_type: true
+    list_remove_unrelated_type: true
+    no_adjacent_strings_in_list: true
+    no_duplicate_case_values: true
+    package_api_docs: true
+    package_prefixed_library_names: true
+    prefer_generic_function_type_aliases: true
+    prefer_is_empty: true
+    prefer_is_not_empty: true
+    prefer_iterable_whereType: true
+    prefer_typing_uninitialized_variables: true
+    sort_child_properties_last: true
+    test_types_in_equals: true
+    throw_in_finally: true
+    unawaited_futures: true
+    unnecessary_import: true
+    unnecessary_null_aware_assignments: true
+    unnecessary_statements: true
+    unnecessary_type_check: true
+    unrelated_type_equality_checks: true
+    unsafe_html: true
+    use_full_hex_values_for_flutter_colors: true
+    valid_regexps: true 

packages/repo_support/.gitignore

@@ -0,0 +1,23 @@
+# See https://www.dartlang.org/guides/libraries/private-files
+
+# Files and directories created by pub
+.dart_tool/
+.packages
+.pub/
+build/
+# If you're building an application, you may want to check-in your pubspec.lock
+pubspec.lock
+
+# Directory created by dartdoc
+# If you don't generate documentation locally you can remove this line.
+doc/api/
+
+# Intellij
+*.idea/
+*.iml
+
+# VS code
+.vscode
+
+# Local
+.local/

packages/repo_support/README.md

@@ -0,0 +1,8 @@
+# repo_support
+
+App flutter utils repo support
+
+```
+dart run tool/run_ci.dart
+
+```

packages/repo_support/pubspec.yaml

@@ -0,0 +1,11 @@
+name: simplex_repo_support
+description: SimpleX build tools
+version: 0.2.0
+publish_to: none
+
+environment:
+  sdk: '>=2.12.0 <3.0.0'
+
+dev_dependencies:
+  dev_test:
+

packages/repo_support/tool/run_ci.dart

@@ -0,0 +1,14 @@
+// ignore_for_file: prefer_double_quotes
+
+import 'package:dev_test/package.dart';
+import 'package:path/path.dart';
+
+Future main() async {
+  for (var dir in [
+    'simplex_app',
+    'simplexmq',
+    'repo_support',
+  ]) {
+    await packageRunCi(join('..', dir));
+  }
+}

packages/simplex_app/.gitignore

@@ -0,0 +1,2 @@
+# Keep for apps
+!pubspec.lock

packages/simplex_app/.metadata

@@ -0,0 +1,10 @@
+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+  revision: 4cc385b4b84ac2f816d939a49ea1f328c4e0b48e
+  channel: stable
+
+project_type: app

packages/simplex_app/README.md

@@ -0,0 +1,16 @@
+# simplex_app
+
+A new Flutter project.
+
+## Getting Started
+
+This project is a starting point for a Flutter application.
+
+A few resources to get you started if this is your first Flutter project:
+
+- [Lab: Write your first Flutter app](https://flutter.dev/docs/get-started/codelab)
+- [Cookbook: Useful Flutter samples](https://flutter.dev/docs/cookbook)
+
+For help getting started with Flutter, view our
+[online documentation](https://flutter.dev/docs), which offers tutorials,
+samples, guidance on mobile development, and a full API reference.

packages/simplex_app/analysis_options.yaml

@@ -0,0 +1,45 @@
+# https://dart.dev/guides/language/analysis-options
+include: package:flutter_lints/flutter.yaml
+
+linter:
+  # https://dart-lang.github.io/linter/lints/index.html.
+  rules:
+    prefer_double_quotes: true
+    always_declare_return_types: true   
+    avoid_dynamic_calls: true
+    avoid_empty_else: true
+    avoid_relative_lib_imports: true
+    avoid_shadowing_type_parameters: true
+    avoid_slow_async_io: true
+    avoid_types_as_parameter_names: true
+    await_only_futures: true
+    camel_case_extensions: true
+    camel_case_types: true
+    cancel_subscriptions: true
+    curly_braces_in_flow_control_structures: true
+    directives_ordering: true
+    empty_catches: true
+    hash_and_equals: true
+    iterable_contains_unrelated_type: true
+    list_remove_unrelated_type: true
+    no_adjacent_strings_in_list: true
+    no_duplicate_case_values: true
+    package_api_docs: true
+    package_prefixed_library_names: true
+    prefer_generic_function_type_aliases: true
+    prefer_is_empty: true
+    prefer_is_not_empty: true
+    prefer_iterable_whereType: true
+    prefer_typing_uninitialized_variables: true
+    sort_child_properties_last: true
+    test_types_in_equals: true
+    throw_in_finally: true
+    unawaited_futures: true
+    unnecessary_import: true
+    unnecessary_null_aware_assignments: true
+    unnecessary_statements: true
+    unnecessary_type_check: true
+    unrelated_type_equality_checks: true
+    unsafe_html: true
+    use_full_hex_values_for_flutter_colors: true
+    valid_regexps: true 

packages/simplex_app/android/.gitignore

@@ -0,0 +1,13 @@
+gradle-wrapper.jar
+/.gradle
+/captures/
+/gradlew
+/gradlew.bat
+/local.properties
+GeneratedPluginRegistrant.java
+
+# Remember to never publicly share your keystore.
+# See https://flutter.dev/docs/deployment/android#reference-the-keystore-from-the-app
+key.properties
+**/*.keystore
+**/*.jks

packages/simplex_app/android/app/build.gradle

@@ -0,0 +1,68 @@
+def localProperties = new Properties()
+def localPropertiesFile = rootProject.file('local.properties')
+if (localPropertiesFile.exists()) {
+    localPropertiesFile.withReader('UTF-8') { reader ->
+        localProperties.load(reader)
+    }
+}
+
+def flutterRoot = localProperties.getProperty('flutter.sdk')
+if (flutterRoot == null) {
+    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
+}
+
+def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
+if (flutterVersionCode == null) {
+    flutterVersionCode = '1'
+}
+
+def flutterVersionName = localProperties.getProperty('flutter.versionName')
+if (flutterVersionName == null) {
+    flutterVersionName = '1.0'
+}
+
+apply plugin: 'com.android.application'
+apply plugin: 'kotlin-android'
+apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
+
+android {
+    compileSdkVersion 30
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+
+    kotlinOptions {
+        jvmTarget = '1.8'
+    }
+
+    sourceSets {
+        main.java.srcDirs += 'src/main/kotlin'
+    }
+
+    defaultConfig {
+        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
+        applicationId "chat.simplex.app"
+        minSdkVersion 16
+        targetSdkVersion 30
+        versionCode flutterVersionCode.toInteger()
+        versionName flutterVersionName
+    }
+
+    buildTypes {
+        release {
+            // TODO: Add your own signing config for the release build.
+            // Signing with the debug keys for now, so `flutter run --release` works.
+            signingConfig signingConfigs.debug
+        }
+    }
+}
+
+flutter {
+    source '../..'
+}
+
+dependencies {
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+}

packages/simplex_app/android/app/src/debug/AndroidManifest.xml

@@ -0,0 +1,7 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="chat.simplex.app">
+    <!-- Flutter needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>

packages/simplex_app/android/app/src/main/AndroidManifest.xml

@@ -0,0 +1,41 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="chat.simplex.app">
+   <application
+        android:label="simplex_chat"
+        android:icon="@mipmap/ic_launcher">
+        <activity
+            android:name=".MainActivity"
+            android:launchMode="singleTop"
+            android:theme="@style/LaunchTheme"
+            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
+            android:hardwareAccelerated="true"
+            android:windowSoftInputMode="adjustResize">
+            <!-- Specifies an Android theme to apply to this Activity as soon as
+                 the Android process has started. This theme is visible to the user
+                 while the Flutter UI initializes. After that, this theme continues
+                 to determine the Window background behind the Flutter UI. -->
+            <meta-data
+              android:name="io.flutter.embedding.android.NormalTheme"
+              android:resource="@style/NormalTheme"
+              />
+            <!-- Displays an Android View that continues showing the launch screen
+                 Drawable until Flutter paints its first frame, then this splash
+                 screen fades out. A splash screen is useful to avoid any visual
+                 gap between the end of Android's launch screen and the painting of
+                 Flutter's first frame. -->
+            <meta-data
+              android:name="io.flutter.embedding.android.SplashScreenDrawable"
+              android:resource="@drawable/launch_background"
+              />
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+        </activity>
+        <!-- Don't delete the meta-data below.
+             This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
+        <meta-data
+            android:name="flutterEmbedding"
+            android:value="2" />
+    </application>
+</manifest>

packages/simplex_app/android/app/src/main/kotlin/com/example/simplex_app/MainActivity.kt

@@ -0,0 +1,6 @@
+package chat.simplex.app
+
+import io.flutter.embedding.android.FlutterActivity
+
+class MainActivity: FlutterActivity() {
+}

packages/simplex_app/android/app/src/main/res/drawable-v21/launch_background.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Modify this file to customize your launch splash screen -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="?android:colorBackground" />
+
+    <!-- You can insert your own image assets here -->
+    <!-- <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@mipmap/launch_image" />
+    </item> -->
+</layer-list>

packages/simplex_app/android/app/src/main/res/drawable/launch_background.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Modify this file to customize your launch splash screen -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="@android:color/white" />
+
+    <!-- You can insert your own image assets here -->
+    <!-- <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@mipmap/launch_image" />
+    </item> -->
+</layer-list>

packages/simplex_app/android/app/src/main/res/values-night/styles.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Theme applied to the Android Window while the process is starting when the OS's Dark Mode setting is on -->
+    <style name="LaunchTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <!-- Show a splash screen on the activity. Automatically removed when
+             Flutter draws its first frame -->
+        <item name="android:windowBackground">@drawable/launch_background</item>
+    </style>
+    <!-- Theme applied to the Android Window as soon as the process has started.
+         This theme determines the color of the Android Window while your
+         Flutter UI initializes, as well as behind your Flutter UI while its
+         running.
+         
+         This Theme is only used starting with V2 of Flutter's Android embedding. -->
+    <style name="NormalTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <item name="android:windowBackground">?android:colorBackground</item>
+    </style>
+</resources>

packages/simplex_app/android/app/src/main/res/values/styles.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Theme applied to the Android Window while the process is starting when the OS's Dark Mode setting is off -->
+    <style name="LaunchTheme" parent="@android:style/Theme.Light.NoTitleBar">
+        <!-- Show a splash screen on the activity. Automatically removed when
+             Flutter draws its first frame -->
+        <item name="android:windowBackground">@drawable/launch_background</item>
+    </style>
+    <!-- Theme applied to the Android Window as soon as the process has started.
+         This theme determines the color of the Android Window while your
+         Flutter UI initializes, as well as behind your Flutter UI while its
+         running.
+         
+         This Theme is only used starting with V2 of Flutter's Android embedding. -->
+    <style name="NormalTheme" parent="@android:style/Theme.Light.NoTitleBar">
+        <item name="android:windowBackground">?android:colorBackground</item>
+    </style>
+</resources>

packages/simplex_app/android/app/src/profile/AndroidManifest.xml

@@ -0,0 +1,7 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="chat.simplex.app">
+    <!-- Flutter needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>

packages/simplex_app/android/build.gradle

@@ -0,0 +1,29 @@
+buildscript {
+    ext.kotlin_version = '1.3.50'
+    repositories {
+        google()
+        mavenCentral()
+    }
+
+    dependencies {
+        classpath 'com.android.tools.build:gradle:4.1.0'
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+    }
+}
+
+allprojects {
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+
+rootProject.buildDir = '../build'
+subprojects {
+    project.buildDir = "${rootProject.buildDir}/${project.name}"
+    project.evaluationDependsOn(':app')
+}
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}

packages/simplex_app/android/gradle.properties

@@ -0,0 +1,3 @@
+org.gradle.jvmargs=-Xmx1536M
+android.useAndroidX=true
+android.enableJetifier=true

packages/simplex_app/android/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,6 @@
+#Fri Jun 23 08:50:38 CEST 2017
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.7-all.zip

packages/simplex_app/android/settings.gradle

@@ -0,0 +1,11 @@
+include ':app'
+
+def localPropertiesFile = new File(rootProject.projectDir, "local.properties")
+def properties = new Properties()
+
+assert localPropertiesFile.exists()
+localPropertiesFile.withReader("UTF-8") { reader -> properties.load(reader) }
+
+def flutterSdkPath = properties.getProperty("flutter.sdk")
+assert flutterSdkPath != null, "flutter.sdk not set in local.properties"
+apply from: "$flutterSdkPath/packages/flutter_tools/gradle/app_plugin_loader.gradle"

packages/simplex_app/build/unit_test_assets/AssetManifest.json

@@ -0,0 +1 @@
+{"packages/cupertino_icons/assets/CupertinoIcons.ttf":["packages/cupertino_icons/assets/CupertinoIcons.ttf"]}

packages/simplex_app/build/unit_test_assets/FontManifest.json

@@ -0,0 +1 @@
+[{"family":"MaterialIcons","fonts":[{"asset":"fonts/MaterialIcons-Regular.otf"}]},{"family":"packages/cupertino_icons/CupertinoIcons","fonts":[{"asset":"packages/cupertino_icons/assets/CupertinoIcons.ttf"}]}]

packages/simplex_app/ios/.gitignore

@@ -0,0 +1,33 @@
+*.mode1v3
+*.mode2v3
+*.moved-aside
+*.pbxuser
+*.perspectivev3
+**/*sync/
+.sconsign.dblite
+.tags*
+**/.vagrant/
+**/DerivedData/
+Icon?
+**/Pods/
+**/.symlinks/
+profile
+xcuserdata
+**/.generated/
+Flutter/App.framework
+Flutter/Flutter.framework
+Flutter/Flutter.podspec
+Flutter/Generated.xcconfig
+Flutter/ephemeral/
+Flutter/app.flx
+Flutter/app.zip
+Flutter/flutter_assets/
+Flutter/flutter_export_environment.sh
+ServiceDefinitions.json
+Runner/GeneratedPluginRegistrant.*
+
+# Exceptions to above rules.
+!default.mode1v3
+!default.mode2v3
+!default.pbxuser
+!default.perspectivev3

packages/simplex_app/ios/Flutter/AppFrameworkInfo.plist

@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+  <key>CFBundleDevelopmentRegion</key>
+  <string>en</string>
+  <key>CFBundleExecutable</key>
+  <string>App</string>
+  <key>CFBundleIdentifier</key>
+  <string>io.flutter.flutter.app</string>
+  <key>CFBundleInfoDictionaryVersion</key>
+  <string>6.0</string>
+  <key>CFBundleName</key>
+  <string>App</string>
+  <key>CFBundlePackageType</key>
+  <string>FMWK</string>
+  <key>CFBundleShortVersionString</key>
+  <string>1.0</string>
+  <key>CFBundleSignature</key>
+  <string>????</string>
+  <key>CFBundleVersion</key>
+  <string>1.0</string>
+  <key>MinimumOSVersion</key>
+  <string>9.0</string>
+</dict>
+</plist>

packages/simplex_app/ios/Flutter/Debug.xcconfig

@@ -0,0 +1 @@
+#include "Generated.xcconfig"

packages/simplex_app/ios/Flutter/Release.xcconfig

@@ -0,0 +1 @@
+#include "Generated.xcconfig"

packages/simplex_app/ios/Runner.xcodeproj/project.pbxproj

@@ -0,0 +1,471 @@
+// !$*UTF8*$!
+{
+	archiveVersion = 1;
+	classes = {
+	};
+	objectVersion = 46;
+	objects = {
+
+/* Begin PBXBuildFile section */
+		1498D2341E8E89220040F4C2 /* GeneratedPluginRegistrant.m in Sources */ = {isa = PBXBuildFile; fileRef = 1498D2331E8E89220040F4C2 /* GeneratedPluginRegistrant.m */; };
+		3B3967161E833CAA004F5970 /* AppFrameworkInfo.plist in Resources */ = {isa = PBXBuildFile; fileRef = 3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */; };
+		74858FAF1ED2DC5600515810 /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 74858FAE1ED2DC5600515810 /* AppDelegate.swift */; };
+		97C146FC1CF9000F007C117D /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 97C146FA1CF9000F007C117D /* Main.storyboard */; };
+		97C146FE1CF9000F007C117D /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 97C146FD1CF9000F007C117D /* Assets.xcassets */; };
+		97C147011CF9000F007C117D /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 97C146FF1CF9000F007C117D /* LaunchScreen.storyboard */; };
+/* End PBXBuildFile section */
+
+/* Begin PBXCopyFilesBuildPhase section */
+		9705A1C41CF9048500538489 /* Embed Frameworks */ = {
+			isa = PBXCopyFilesBuildPhase;
+			buildActionMask = 2147483647;
+			dstPath = "";
+			dstSubfolderSpec = 10;
+			files = (
+			);
+			name = "Embed Frameworks";
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXCopyFilesBuildPhase section */
+
+/* Begin PBXFileReference section */
+		1498D2321E8E86230040F4C2 /* GeneratedPluginRegistrant.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = GeneratedPluginRegistrant.h; sourceTree = "<group>"; };
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packages/simplex_app/ios/Runner.xcodeproj/project.xcworkspace/contents.xcworkspacedata

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+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:">
+   </FileRef>
+</Workspace>

packages/simplex_app/ios/Runner.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

packages/simplex_app/ios/Runner.xcodeproj/project.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>PreviewsEnabled</key>
+	<false/>
+</dict>
+</plist>

packages/simplex_app/ios/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme

@@ -0,0 +1,91 @@
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+<Scheme
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+   version = "1.3">
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+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+               BuildableName = "Runner.app"
+               BlueprintName = "Runner"
+               ReferencedContainer = "container:Runner.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <Testables>
+      </Testables>
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+            BuildableName = "Runner.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+            BuildableName = "Runner.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Profile"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+            BuildableName = "Runner.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

packages/simplex_app/ios/Runner.xcworkspace/contents.xcworkspacedata

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "group:Runner.xcodeproj">
+   </FileRef>
+</Workspace>

packages/simplex_app/ios/Runner.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

packages/simplex_app/ios/Runner.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>PreviewsEnabled</key>
+	<false/>
+</dict>
+</plist>

packages/simplex_app/ios/Runner/AppDelegate.swift

@@ -0,0 +1,13 @@
+import UIKit
+import Flutter
+
+@UIApplicationMain
+@objc class AppDelegate: FlutterAppDelegate {
+  override func application(
+    _ application: UIApplication,
+    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
+  ) -> Bool {
+    GeneratedPluginRegistrant.register(with: self)
+    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
+  }
+}

packages/simplex_app/ios/Runner/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -0,0 +1,122 @@
+{
+  "images" : [
+    {
+      "size" : "20x20",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-20x20@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "20x20",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-20x20@3x.png",
+      "scale" : "3x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-29x29@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-29x29@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-29x29@3x.png",
+      "scale" : "3x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-40x40@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-40x40@3x.png",
+      "scale" : "3x"
+    },
+    {
+      "size" : "60x60",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-60x60@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "60x60",
+      "idiom" : "iphone",
+      "filename" : "Icon-App-60x60@3x.png",
+      "scale" : "3x"
+    },
+    {
+      "size" : "20x20",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-20x20@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "20x20",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-20x20@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-29x29@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "29x29",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-29x29@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-40x40@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "40x40",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-40x40@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "76x76",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-76x76@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "76x76",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-76x76@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "83.5x83.5",
+      "idiom" : "ipad",
+      "filename" : "Icon-App-83.5x83.5@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "1024x1024",
+      "idiom" : "ios-marketing",
+      "filename" : "Icon-App-1024x1024@1x.png",
+      "scale" : "1x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

packages/simplex_app/ios/Runner/Assets.xcassets/LaunchImage.imageset/Contents.json

@@ -0,0 +1,23 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "filename" : "LaunchImage.png",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "LaunchImage@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "LaunchImage@3x.png",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

packages/simplex_app/ios/Runner/Assets.xcassets/LaunchImage.imageset/README.md

@@ -0,0 +1,5 @@
+# Launch Screen Assets
+
+You can customize the launch screen with your own desired assets by replacing the image files in this directory.
+
+You can also do it by opening your Flutter project's Xcode project with `open ios/Runner.xcworkspace`, selecting `Runner/Assets.xcassets` in the Project Navigator and dropping in the desired images.

packages/simplex_app/ios/Runner/Base.lproj/LaunchScreen.storyboard

@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="12121" systemVersion="16G29" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
+    <dependencies>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="12089"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="EHf-IW-A2E">
+            <objects>
+                <viewController id="01J-lp-oVM" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="Ydg-fD-yQy"/>
+                        <viewControllerLayoutGuide type="bottom" id="xbc-2k-c8Z"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <subviews>
+                            <imageView opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" image="LaunchImage" translatesAutoresizingMaskIntoConstraints="NO" id="YRO-k0-Ey4">
+                            </imageView>
+                        </subviews>
+                        <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                        <constraints>
+                            <constraint firstItem="YRO-k0-Ey4" firstAttribute="centerX" secondItem="Ze5-6b-2t3" secondAttribute="centerX" id="1a2-6s-vTC"/>
+                            <constraint firstItem="YRO-k0-Ey4" firstAttribute="centerY" secondItem="Ze5-6b-2t3" secondAttribute="centerY" id="4X2-HB-R7a"/>
+                        </constraints>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="53" y="375"/>
+        </scene>
+    </scenes>
+    <resources>
+        <image name="LaunchImage" width="168" height="185"/>
+    </resources>
+</document>

packages/simplex_app/ios/Runner/Base.lproj/Main.storyboard

@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="10117" systemVersion="15F34" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="BYZ-38-t0r">
+    <dependencies>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="10085"/>
+    </dependencies>
+    <scenes>
+        <!--Flutter View Controller-->
+        <scene sceneID="tne-QT-ifu">
+            <objects>
+                <viewController id="BYZ-38-t0r" customClass="FlutterViewController" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="y3c-jy-aDJ"/>
+                        <viewControllerLayoutGuide type="bottom" id="wfy-db-euE"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
+                        <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
+            </objects>
+        </scene>
+    </scenes>
+</document>

packages/simplex_app/ios/Runner/Info.plist

@@ -0,0 +1,45 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>simplex_chat</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>$(FLUTTER_BUILD_NAME)</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleVersion</key>
+	<string>$(FLUTTER_BUILD_NUMBER)</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>UILaunchStoryboardName</key>
+	<string>LaunchScreen</string>
+	<key>UIMainStoryboardFile</key>
+	<string>Main</string>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>UISupportedInterfaceOrientations~ipad</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationPortraitUpsideDown</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>UIViewControllerBasedStatusBarAppearance</key>
+	<false/>
+</dict>
+</plist>

packages/simplex_app/ios/Runner/Runner-Bridging-Header.h

@@ -0,0 +1 @@
+#import "GeneratedPluginRegistrant.h"

packages/simplex_app/lib/main.dart

@@ -0,0 +1,115 @@
+import "package:flutter/material.dart";
+
+void main() {
+  runApp(const MyApp());
+}
+
+class MyApp extends StatelessWidget {
+  const MyApp({Key? key}) : super(key: key);
+
+  // This widget is the root of your application.
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      title: "Flutter Demo",
+      theme: ThemeData(
+        // This is the theme of your application.
+        //
+        // Try running your application with "flutter run". You'll see the
+        // application has a blue toolbar. Then, without quitting the app, try
+        // changing the primarySwatch below to Colors.green and then invoke
+        // "hot reload" (press "r" in the console where you ran "flutter run",
+        // or simply save your changes to "hot reload" in a Flutter IDE).
+        // Notice that the counter didn't reset back to zero; the application
+        // is not restarted.
+        primarySwatch: Colors.blue,
+      ),
+      home: const MyHomePage(title: "Flutter Demo Home Page"),
+    );
+  }
+}
+
+class MyHomePage extends StatefulWidget {
+  const MyHomePage({Key? key, required this.title}) : super(key: key);
+
+  // This widget is the home page of your application. It is stateful, meaning
+  // that it has a State object (defined below) that contains fields that affect
+  // how it looks.
+
+  // This class is the configuration for the state. It holds the values (in this
+  // case the title) provided by the parent (in this case the App widget) and
+  // used by the build method of the State. Fields in a Widget subclass are
+  // always marked "final".
+
+  final String title;
+
+  @override
+  State<MyHomePage> createState() => _MyHomePageState();
+}
+
+class _MyHomePageState extends State<MyHomePage> {
+  int _counter = 0;
+
+  void _incrementCounter() {
+    setState(() {
+      // This call to setState tells the Flutter framework that something has
+      // changed in this State, which causes it to rerun the build method below
+      // so that the display can reflect the updated values. If we changed
+      // _counter without calling setState(), then the build method would not be
+      // called again, and so nothing would appear to happen.
+      _counter++;
+    });
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    // This method is rerun every time setState is called, for instance as done
+    // by the _incrementCounter method above.
+    //
+    // The Flutter framework has been optimized to make rerunning build methods
+    // fast, so that you can just rebuild anything that needs updating rather
+    // than having to individually change instances of widgets.
+    return Scaffold(
+      appBar: AppBar(
+        // Here we take the value from the MyHomePage object that was created by
+        // the App.build method, and use it to set our appbar title.
+        title: Text(widget.title),
+      ),
+      body: Center(
+        // Center is a layout widget. It takes a single child and positions it
+        // in the middle of the parent.
+        child: Column(
+          // Column is also a layout widget. It takes a list of children and
+          // arranges them vertically. By default, it sizes itself to fit its
+          // children horizontally, and tries to be as tall as its parent.
+          //
+          // Invoke "debug painting" (press "p" in the console, choose the
+          // "Toggle Debug Paint" action from the Flutter Inspector in Android
+          // Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
+          // to see the wireframe for each widget.
+          //
+          // Column has various properties to control how it sizes itself and
+          // how it positions its children. Here we use mainAxisAlignment to
+          // center the children vertically; the main axis here is the vertical
+          // axis because Columns are vertical (the cross axis would be
+          // horizontal).
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: <Widget>[
+            const Text(
+              "You have pushed the button this many times:",
+            ),
+            Text(
+              "$_counter",
+              style: Theme.of(context).textTheme.headline4,
+            ),
+          ],
+        ),
+      ),
+      floatingActionButton: FloatingActionButton(
+        onPressed: _incrementCounter,
+        tooltip: "Increment",
+        child: const Icon(Icons.add),
+      ), // This trailing comma makes auto-formatting nicer for build methods.
+    );
+  }
+}

packages/simplex_app/pubspec.lock

@@ -0,0 +1,167 @@
+# Generated by pub
+# See https://dart.dev/tools/pub/glossary#lockfile
+packages:
+  async:
+    dependency: transitive
+    description:
+      name: async
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.8.1"
+  boolean_selector:
+    dependency: transitive
+    description:
+      name: boolean_selector
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.1.0"
+  characters:
+    dependency: transitive
+    description:
+      name: characters
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.1.0"
+  charcode:
+    dependency: transitive
+    description:
+      name: charcode
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.3.1"
+  clock:
+    dependency: transitive
+    description:
+      name: clock
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.1.0"
+  collection:
+    dependency: transitive
+    description:
+      name: collection
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.15.0"
+  cupertino_icons:
+    dependency: "direct main"
+    description:
+      name: cupertino_icons
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.3"
+  fake_async:
+    dependency: transitive
+    description:
+      name: fake_async
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.2.0"
+  flutter:
+    dependency: "direct main"
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  flutter_lints:
+    dependency: "direct dev"
+    description:
+      name: flutter_lints
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.4"
+  flutter_test:
+    dependency: "direct dev"
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  lints:
+    dependency: transitive
+    description:
+      name: lints
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.1"
+  matcher:
+    dependency: transitive
+    description:
+      name: matcher
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.12.10"
+  meta:
+    dependency: transitive
+    description:
+      name: meta
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.7.0"
+  path:
+    dependency: transitive
+    description:
+      name: path
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.8.0"
+  sky_engine:
+    dependency: transitive
+    description: flutter
+    source: sdk
+    version: "0.0.99"
+  source_span:
+    dependency: transitive
+    description:
+      name: source_span
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.8.1"
+  stack_trace:
+    dependency: transitive
+    description:
+      name: stack_trace
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.10.0"
+  stream_channel:
+    dependency: transitive
+    description:
+      name: stream_channel
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.1.0"
+  string_scanner:
+    dependency: transitive
+    description:
+      name: string_scanner
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.1.0"
+  term_glyph:
+    dependency: transitive
+    description:
+      name: term_glyph
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.2.0"
+  test_api:
+    dependency: transitive
+    description:
+      name: test_api
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.4.2"
+  typed_data:
+    dependency: transitive
+    description:
+      name: typed_data
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.3.0"
+  vector_math:
+    dependency: transitive
+    description:
+      name: vector_math
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.1.0"
+sdks:
+  dart: ">=2.14.0 <3.0.0"

packages/simplex_app/pubspec.yaml

@@ -0,0 +1,89 @@
+name: simplex_app
+description: A new Flutter project.
+
+# The following line prevents the package from being accidentally published to
+# pub.dev using `flutter pub publish`. This is preferred for private packages.
+publish_to: 'none' # Remove this line if you wish to publish to pub.dev
+
+# The following defines the version and build number for your application.
+# A version number is three numbers separated by dots, like 1.2.43
+# followed by an optional build number separated by a +.
+# Both the version and the builder number may be overridden in flutter
+# build by specifying --build-name and --build-number, respectively.
+# In Android, build-name is used as versionName while build-number used as versionCode.
+# Read more about Android versioning at https://developer.android.com/studio/publish/versioning
+# In iOS, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion.
+# Read more about iOS versioning at
+# https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
+version: 1.0.0+1
+
+environment:
+  sdk: ">=2.14.0 <3.0.0"
+
+# Dependencies specify other packages that your package needs in order to work.
+# To automatically upgrade your package dependencies to the latest versions
+# consider running `flutter pub upgrade --major-versions`. Alternatively,
+# dependencies can be manually updated by changing the version numbers below to
+# the latest version available on pub.dev. To see which dependencies have newer
+# versions available, run `flutter pub outdated`.
+dependencies:
+  flutter:
+    sdk: flutter
+
+
+  # The following adds the Cupertino Icons font to your application.
+  # Use with the CupertinoIcons class for iOS style icons.
+  cupertino_icons: ^1.0.2
+
+dev_dependencies:
+  flutter_test:
+    sdk: flutter
+
+  # The "flutter_lints" package below contains a set of recommended lints to
+  # encourage good coding practices. The lint set provided by the package is
+  # activated in the `analysis_options.yaml` file located at the root of your
+  # package. See that file for information about deactivating specific lint
+  # rules and activating additional ones.
+  flutter_lints: ^1.0.0
+
+# For information on the generic Dart part of this file, see the
+# following page: https://dart.dev/tools/pub/pubspec
+
+# The following section is specific to Flutter.
+flutter:
+
+  # The following line ensures that the Material Icons font is
+  # included with your application, so that you can use the icons in
+  # the material Icons class.
+  uses-material-design: true
+
+  # To add assets to your application, add an assets section, like this:
+  # assets:
+  #   - images/a_dot_burr.jpeg
+  #   - images/a_dot_ham.jpeg
+
+  # An image asset can refer to one or more resolution-specific "variants", see
+  # https://flutter.dev/assets-and-images/#resolution-aware.
+
+  # For details regarding adding assets from package dependencies, see
+  # https://flutter.dev/assets-and-images/#from-packages
+
+  # To add custom fonts to your application, add a fonts section here,
+  # in this "flutter" section. Each entry in this list should have a
+  # "family" key with the font family name, and a "fonts" key with a
+  # list giving the asset and other descriptors for the font. For
+  # example:
+  # fonts:
+  #   - family: Schyler
+  #     fonts:
+  #       - asset: fonts/Schyler-Regular.ttf
+  #       - asset: fonts/Schyler-Italic.ttf
+  #         style: italic
+  #   - family: Trajan Pro
+  #     fonts:
+  #       - asset: fonts/TrajanPro.ttf
+  #       - asset: fonts/TrajanPro_Bold.ttf
+  #         weight: 700
+  #
+  # For details regarding fonts from package dependencies,
+  # see https://flutter.dev/custom-fonts/#from-packages

packages/simplex_app/test/widget_test.dart

@@ -0,0 +1,30 @@
+// This is a basic Flutter widget test.
+//
+// To perform an interaction with a widget in your test, use the WidgetTester
+// utility that Flutter provides. For example, you can send tap and scroll
+// gestures. You can also use WidgetTester to find child widgets in the widget
+// tree, read text, and verify that the values of widget properties are correct.
+
+import "package:flutter/material.dart";
+import "package:flutter_test/flutter_test.dart";
+
+import "package:simplex_app/main.dart";
+
+void main() {
+  testWidgets("Counter increments smoke test", (WidgetTester tester) async {
+    // Build our app and trigger a frame.
+    await tester.pumpWidget(const MyApp());
+
+    // Verify that our counter starts at 0.
+    expect(find.text("0"), findsOneWidget);
+    expect(find.text("1"), findsNothing);
+
+    // Tap the '+' icon and trigger a frame.
+    await tester.tap(find.byIcon(Icons.add));
+    await tester.pump();
+
+    // Verify that our counter has incremented.
+    expect(find.text("0"), findsNothing);
+    expect(find.text("1"), findsOneWidget);
+  });
+}

packages/simplex_app/web/index.html

@@ -0,0 +1,101 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <!--
+    If you are serving your web app in a path other than the root, change the
+    href value below to reflect the base path you are serving from.
+
+    The path provided below has to start and end with a slash "/" in order for
+    it to work correctly.
+
+    For more details:
+    * https://developer.mozilla.org/en-US/docs/Web/HTML/Element/base
+
+    This is a placeholder for base href that will be replaced by the value of
+    the `--base-href` argument provided to `flutter build`.
+  -->
+  <base href="$FLUTTER_BASE_HREF">
+
+  <meta charset="UTF-8">
+  <meta content="IE=Edge" http-equiv="X-UA-Compatible">
+  <meta name="description" content="A new Flutter project.">
+
+  <!-- iOS meta tags & icons -->
+  <meta name="apple-mobile-web-app-capable" content="yes">
+  <meta name="apple-mobile-web-app-status-bar-style" content="black">
+  <meta name="apple-mobile-web-app-title" content="simplex_chat">
+  <link rel="apple-touch-icon" href="icons/Icon-192.png">
+
+  <title>simplex_chat</title>
+  <link rel="manifest" href="manifest.json">
+</head>
+<body>
+  <!-- This script installs service_worker.js to provide PWA functionality to
+       application. For more information, see:
+       https://developers.google.com/web/fundamentals/primers/service-workers -->
+  <script>
+    var serviceWorkerVersion = null;
+    var scriptLoaded = false;
+    function loadMainDartJs() {
+      if (scriptLoaded) {
+        return;
+      }
+      scriptLoaded = true;
+      var scriptTag = document.createElement('script');
+      scriptTag.src = 'main.dart.js';
+      scriptTag.type = 'application/javascript';
+      document.body.append(scriptTag);
+    }
+
+    if ('serviceWorker' in navigator) {
+      // Service workers are supported. Use them.
+      window.addEventListener('load', function () {
+        // Wait for registration to finish before dropping the <script> tag.
+        // Otherwise, the browser will load the script multiple times,
+        // potentially different versions.
+        var serviceWorkerUrl = 'flutter_service_worker.js?v=' + serviceWorkerVersion;
+        navigator.serviceWorker.register(serviceWorkerUrl)
+          .then((reg) => {
+            function waitForActivation(serviceWorker) {
+              serviceWorker.addEventListener('statechange', () => {
+                if (serviceWorker.state == 'activated') {
+                  console.log('Installed new service worker.');
+                  loadMainDartJs();
+                }
+              });
+            }
+            if (!reg.active && (reg.installing || reg.waiting)) {
+              // No active web worker and we have installed or are installing
+              // one for the first time. Simply wait for it to activate.
+              waitForActivation(reg.installing || reg.waiting);
+            } else if (!reg.active.scriptURL.endsWith(serviceWorkerVersion)) {
+              // When the app updates the serviceWorkerVersion changes, so we
+              // need to ask the service worker to update.
+              console.log('New service worker available.');
+              reg.update();
+              waitForActivation(reg.installing);
+            } else {
+              // Existing service worker is still good.
+              console.log('Loading app from service worker.');
+              loadMainDartJs();
+            }
+          });
+
+        // If service worker doesn't succeed in a reasonable amount of time,
+        // fallback to plaint <script> tag.
+        setTimeout(() => {
+          if (!scriptLoaded) {
+            console.warn(
+              'Failed to load app from service worker. Falling back to plain <script> tag.',
+            );
+            loadMainDartJs();
+          }
+        }, 4000);
+      });
+    } else {
+      // Service workers not supported. Just drop the <script> tag.
+      loadMainDartJs();
+    }
+  </script>
+</body>
+</html>

packages/simplex_app/web/manifest.json

@@ -0,0 +1,35 @@
+{
+    "name": "simplex_chat",
+    "short_name": "simplex_chat",
+    "start_url": ".",
+    "display": "standalone",
+    "background_color": "#0175C2",
+    "theme_color": "#0175C2",
+    "description": "A new Flutter project.",
+    "orientation": "portrait-primary",
+    "prefer_related_applications": false,
+    "icons": [
+        {
+            "src": "icons/Icon-192.png",
+            "sizes": "192x192",
+            "type": "image/png"
+        },
+        {
+            "src": "icons/Icon-512.png",
+            "sizes": "512x512",
+            "type": "image/png"
+        },
+        {
+            "src": "icons/Icon-maskable-192.png",
+            "sizes": "192x192",
+            "type": "image/png",
+            "purpose": "maskable"
+        },
+        {
+            "src": "icons/Icon-maskable-512.png",
+            "sizes": "512x512",
+            "type": "image/png",
+            "purpose": "maskable"
+        }
+    ]
+}

packages/simplexmq/CHANGELOG.md

@@ -0,0 +1,3 @@
+## 1.0.0
+
+- Initial version.

packages/simplexmq/README.md

@@ -0,0 +1,39 @@
+<!-- 
+This README describes the package. If you publish this package to pub.dev,
+this README's contents appear on the landing page for your package.
+
+For information about how to write a good package README, see the guide for
+[writing package pages](https://dart.dev/guides/libraries/writing-package-pages). 
+
+For general information about developing packages, see the Dart guide for
+[creating packages](https://dart.dev/guides/libraries/create-library-packages)
+and the Flutter guide for
+[developing packages and plugins](https://flutter.dev/developing-packages). 
+-->
+
+TODO: Put a short description of the package here that helps potential users
+know whether this package might be useful for them.
+
+## Features
+
+TODO: List what your package can do. Maybe include images, gifs, or videos.
+
+## Getting started
+
+TODO: List prerequisites and provide or point to information on how to
+start using the package.
+
+## Usage
+
+TODO: Include short and useful examples for package users. Add longer examples
+to `/example` folder. 
+
+```dart
+const like = 'sample';
+```
+
+## Additional information
+
+TODO: Tell users more about the package: where to find more information, how to 
+contribute to the package, how to file issues, what response they can expect 
+from the package authors, and more.

packages/simplexmq/example/simplexmq_example.dart

@@ -0,0 +1 @@
+void main() {}

packages/simplexmq/lib/simplexmq.dart

@@ -0,0 +1,7 @@
+/// Support for doing something awesome.
+///
+/// More dartdocs go here.
+library simplexmq;
+
+export 'src/protocol.dart';
+export 'src/transport.dart' show Transport, SMPTransportClient;

packages/simplexmq/lib/src/buffer.dart

@@ -0,0 +1,154 @@
+import 'dart:typed_data';
+
+Uint8List encodeAscii(String s) => Uint8List.fromList(s.codeUnits);
+
+String decodeAscii(Uint8List b) => String.fromCharCodes(b);
+
+Uint8List concat(Uint8List b1, Uint8List b2) {
+  final a = Uint8List(b1.length + b2.length);
+  a.setAll(0, b1);
+  a.setAll(b1.length, b2);
+  return a;
+}
+
+T fold<T, E>(List<E> xs, T Function(T, E) combine, T initial) {
+  T res = initial;
+  for (final x in xs) {
+    res = combine(res, x);
+  }
+  return res;
+}
+
+Uint8List concatN(List<Uint8List> bs) {
+  final aLen = fold(bs, (int size, Uint8List b) => size + b.length, 0);
+  final a = Uint8List(aLen);
+  fold(bs, (int offset, Uint8List b) {
+    a.setAll(offset, b);
+    return offset + b.length;
+  }, 0);
+  return a;
+}
+
+final charSpace = ' '.codeUnitAt(0);
+final charEqual = '='.codeUnitAt(0);
+final empty = Uint8List(0);
+
+Uint8List unwords(Uint8List b1, Uint8List b2) {
+  final a = Uint8List(b1.length + b2.length + 1);
+  a.setAll(0, b1);
+  a[b1.length] = charSpace;
+  a.setAll(b1.length + 1, b2);
+  return a;
+}
+
+Uint8List unwordsN(List<Uint8List> bs) {
+  int i = bs.length;
+  int size = bs.length - 1;
+  while (i > 0) {
+    size += bs[--i].length;
+  }
+  final a = Uint8List(size);
+
+  int offset = 0;
+  for (i = 0; i < bs.length - 1; i++) {
+    final b = bs[i];
+    a.setAll(offset, b);
+    offset += b.length;
+    a[offset++] = charSpace;
+  }
+  a.setAll(offset, bs[i]);
+  return a;
+}
+
+final _base64chars = Uint8List.fromList(
+    'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
+        .codeUnits);
+
+List<int?> __base64lookup() {
+  final a = List<int?>.filled(256, null);
+  for (int i = 0; i < _base64chars.length; i++) {
+    a[_base64chars[i]] = i;
+  }
+  return a;
+}
+
+final _base64lookup = __base64lookup();
+
+Uint8List encode64(Uint8List a) {
+  final len = a.length;
+  final b64len = (len / 3).ceil() * 4;
+  final b64 = Uint8List(b64len);
+
+  int j = 0;
+  for (int i = 0; i < len; i += 3) {
+    final e1 = i + 1 < len ? a[i + 1] : 0;
+    final e2 = i + 2 < len ? a[i + 2] : 0;
+    b64[j++] = _base64chars[a[i] >> 2];
+    b64[j++] = _base64chars[((a[i] & 3) << 4) | (e1 >> 4)];
+    b64[j++] = _base64chars[((e1 & 15) << 2) | (e2 >> 6)];
+    b64[j++] = _base64chars[e2 & 63];
+  }
+
+  if (len % 3 != 0) b64[b64len - 1] = charEqual;
+  if (len % 3 == 1) b64[b64len - 2] = charEqual;
+
+  return b64;
+}
+
+Uint8List? decode64(Uint8List b64) {
+  int len = b64.length;
+  if (len % 4 != 0) return null;
+  int bLen = (len * 3) >> 2;
+
+  if (b64[len - 1] == charEqual) {
+    len--;
+    bLen--;
+    if (b64[len - 1] == charEqual) {
+      len--;
+      bLen--;
+    }
+  }
+
+  final bytes = Uint8List(bLen);
+
+  int i = 0;
+  int pos = 0;
+  while (i < len) {
+    final enc1 = _base64lookup[b64[i++]];
+    final enc2 = i < len ? _base64lookup[b64[i++]] : 0;
+    final enc3 = i < len ? _base64lookup[b64[i++]] : 0;
+    final enc4 = i < len ? _base64lookup[b64[i++]] : 0;
+    if (enc1 == null || enc2 == null || enc3 == null || enc4 == null) {
+      return null;
+    }
+    bytes[pos++] = (enc1 << 2) | (enc2 >> 4);
+    int p = pos++;
+    if (p < bLen) bytes[p] = ((enc2 & 15) << 4) | (enc3 >> 2);
+    p = pos++;
+    if (p < bLen) bytes[p] = ((enc3 & 3) << 6) | (enc4 & 63);
+  }
+
+  return bytes;
+}
+
+Uint8List encodeInt32(int n) {
+  final data = Uint8List(4);
+  ByteData.sublistView(data).setInt32(0, n);
+  return data;
+}
+
+Uint8List encodeInt16(int n) {
+  final data = Uint8List(2);
+  ByteData.sublistView(data).setInt16(0, n);
+  return data;
+}
+
+extension EqualUint8List on Uint8List {
+  bool equal(Uint8List b) {
+    if (length != b.length) return false;
+    for (int i = 0; i < length; i++) {
+      if (this[i] != b[i]) return false;
+    }
+    return true;
+  }
+}

packages/simplexmq/lib/src/crypto.dart

@@ -0,0 +1,101 @@
+import 'dart:math' show Random;
+import 'dart:typed_data';
+import 'package:pointycastle/api.dart';
+import 'package:pointycastle/asymmetric/api.dart';
+import 'package:pointycastle/asymmetric/oaep.dart';
+import 'package:pointycastle/asymmetric/rsa.dart';
+import 'package:pointycastle/block/aes_fast.dart';
+import 'package:pointycastle/block/modes/gcm.dart';
+import 'package:pointycastle/digests/sha256.dart';
+import 'package:pointycastle/key_generators/api.dart';
+import 'package:pointycastle/key_generators/rsa_key_generator.dart';
+import 'package:pointycastle/random/fortuna_random.dart';
+import 'package:pointycastle/signers/pss_signer.dart';
+import 'buffer.dart';
+
+class AESKey {
+  final Uint8List _key;
+  AESKey._make(this._key);
+
+  static AESKey random([bool secure = false]) =>
+      AESKey._make((secure ? secureRandomBytes : pseudoRandomBytes)(32));
+
+  static AESKey decode(Uint8List rawKey) => AESKey._make(rawKey);
+
+  Uint8List get bytes => _key;
+}
+
+Uint8List randomIV() => pseudoRandomBytes(16);
+
+Uint8List secureRandomBytes(int len) => _randomBytes(len, Random.secure());
+
+final sessionSeed = Random.secure();
+
+Uint8List pseudoRandomBytes(int len) => _randomBytes(len, sessionSeed);
+
+Uint8List _randomBytes(int len, Random seedSource) {
+  final bytes = Uint8List(len);
+  for (int i = 0; i < len; i++) {
+    bytes[i] = seedSource.nextInt(256);
+  }
+  return bytes;
+}
+
+final paddingByte = '#'.codeUnitAt(0);
+
+Uint8List encryptAES(AESKey key, Uint8List iv, int padTo, Uint8List data) {
+  if (data.length >= padTo) throw ArgumentError('large message');
+  final padded = Uint8List(padTo);
+  padded.setAll(0, data);
+  padded.fillRange(data.length, padTo, paddingByte);
+  return _makeGCMCipher(key, iv, true).process(padded);
+}
+
+Uint8List decryptAES(AESKey key, Uint8List iv, Uint8List encryptedAndTag) =>
+    _makeGCMCipher(key, iv, false).process(encryptedAndTag);
+
+GCMBlockCipher _makeGCMCipher(AESKey key, Uint8List iv, bool encrypt) =>
+    GCMBlockCipher(AESFastEngine())
+      ..init(encrypt, AEADParameters(KeyParameter(key._key), 128, iv, empty));
+
+FortunaRandom _secureFortunaRandom() =>
+    FortunaRandom()..seed(KeyParameter(secureRandomBytes(32)));
+
+AsymmetricKeyPair<RSAPublicKey, RSAPrivateKey> generateRSAkeyPair(
+    [int bitLength = 2048]) {
+  final keyGen = RSAKeyGenerator()
+    ..init(ParametersWithRandom(
+        RSAKeyGeneratorParameters(BigInt.parse('65537'), bitLength, 64),
+        _secureFortunaRandom()));
+  final pair = keyGen.generateKeyPair();
+  return AsymmetricKeyPair<RSAPublicKey, RSAPrivateKey>(
+      pair.publicKey as RSAPublicKey, pair.privateKey as RSAPrivateKey);
+}
+
+Uint8List encryptOAEP(RSAPublicKey key, Uint8List data) =>
+    _oaep(true, PublicKeyParameter<RSAPublicKey>(key)).process(data);
+
+Uint8List decryptOAEP(RSAPrivateKey key, Uint8List data) =>
+    _oaep(false, PrivateKeyParameter<RSAPrivateKey>(key)).process(data);
+
+OAEPEncoding _oaep(bool encrypt, AsymmetricKeyParameter keyParam) =>
+    OAEPEncoding.withSHA256(RSAEngine())..init(encrypt, keyParam);
+
+Uint8List signPSS(RSAPrivateKey privateKey, Uint8List data) =>
+    _pss(true, PrivateKeyParameter<RSAPrivateKey>(privateKey))
+        .generateSignature(data)
+        .bytes;
+
+bool verifyPSS(RSAPublicKey publicKey, Uint8List data, Uint8List sig) {
+  try {
+    return _pss(false, PublicKeyParameter<RSAPublicKey>(publicKey))
+        .verifySignature(data, PSSSignature(sig));
+  } on ArgumentError {
+    return false;
+  }
+}
+
+PSSSigner _pss(bool sign, AsymmetricKeyParameter keyParam) => PSSSigner(
+    RSAEngine(), SHA256Digest(), SHA256Digest())
+  ..init(sign,
+      ParametersWithSaltConfiguration(keyParam, _secureFortunaRandom(), 32));

packages/simplexmq/lib/src/parser.dart

@@ -0,0 +1,160 @@
+import 'dart:typed_data';
+import 'buffer.dart';
+
+typedef BinaryTags<T> = Map<T, Uint8List>;
+
+int cc(String c) => c.codeUnitAt(0);
+
+final char0 = cc('0');
+final char9 = cc('9');
+final charLowerA = cc('a');
+final charLowerZ = cc('z');
+final charUpperA = cc('A');
+final charUpperZ = cc('Z');
+final charPlus = cc('+');
+final charSlash = cc('/');
+final charDot = cc('.');
+
+class Parser {
+  final Uint8List _s;
+  final List<int> _positions = [];
+  int _pos = 0;
+  bool _fail = false;
+  Parser(this._s);
+
+  bool get fail => _fail;
+  bool get end => _pos >= _s.length;
+
+  // only calls `parse` if the parser did not previously fail
+  T? _run<T>(T? Function() parse) {
+    if (_fail || _pos >= _s.length) {
+      _fail = true;
+      return null;
+    }
+    final res = parse();
+    if (res == null) _fail = true;
+    return res;
+  }
+
+  T? tryParse<T>(T? Function(Parser p) parse) {
+    if (_fail || _pos >= _s.length) {
+      _fail = true;
+      return null;
+    }
+    _positions.add(_pos);
+    final res = parse(this);
+    final prevPos = _positions.removeLast();
+    if (res == null) {
+      _pos = prevPos;
+      _fail = false;
+    }
+  }
+
+  // takes a required number of bytes
+  Uint8List? take(int len) => _run(() {
+        final end = _pos + len;
+        if (end > _s.length) return null;
+        final res = _s.sublist(_pos, end);
+        _pos = end;
+        return res;
+      });
+
+  // takes chars (> 0) while condition is true; function isAlphaNum or isDigit can be used
+  Uint8List? takeWhile1(bool Function(int) f) => _run(() {
+        final pos = _pos;
+        while (f(_s[_pos])) {
+          _pos++;
+        }
+        return _pos > pos ? _s.sublist(pos, _pos) : null;
+      });
+
+  // takes the non-empty word until the first space or until the end of the string
+  Uint8List? word() => _run(() {
+        int pos = _s.indexOf(charSpace, _pos);
+        if (pos == -1) pos = _s.length;
+        if (pos <= _pos) return null;
+        final res = _s.sublist(_pos, pos);
+        _pos = pos;
+        return res;
+      });
+
+  bool? str(Uint8List s) => _run(() {
+        for (int i = 0, j = _pos; i < s.length; i++, j++) {
+          if (s[i] != _s[j]) return null;
+        }
+        _pos += s.length;
+        return true;
+      });
+
+  // takes the passed char
+  bool? char(int c) => _run(() {
+        if (_s[_pos] == c) {
+          _pos++;
+          return true;
+        }
+      });
+
+  // takes space
+  bool? space() => _run(() {
+        if (_s[_pos] == charSpace) {
+          _pos++;
+          return true;
+        }
+      });
+
+  int? decimal() => _run(() {
+        final s = takeWhile1(isDigit);
+        if (s == null) return null;
+        int n = 0;
+        for (int i = 0; i < s.length; i++) {
+          n *= 10;
+          n += s[i] - char0;
+        }
+        return n;
+      });
+
+  DateTime? datetime() => _run(() {
+        final s = word();
+        if (s != null) return DateTime.tryParse(decodeAscii(s));
+      });
+
+  // takes base-64 encoded string and returns decoded binary
+  Uint8List? base64() => _run(() {
+        bool tryCharEqual() {
+          final ok = _pos < _s.length && _s[_pos] == charEqual;
+          if (ok) _pos++;
+          return ok;
+        }
+
+        final pos = _pos;
+        int c;
+        do {
+          c = _s[_pos];
+        } while ((isAlphaNum(c) || c == charPlus || c == charSlash) &&
+            ++_pos < _s.length);
+
+        if (tryCharEqual()) tryCharEqual();
+        return _pos > pos ? decode64(_s.sublist(pos, _pos)) : null;
+      });
+
+  // takes one of the binary tags and returns its key
+  T? someStr<T>(BinaryTags<T> ts) => _run(() {
+        outer:
+        for (final t in ts.entries) {
+          final s = t.value;
+          for (int i = 0, j = _pos; i < s.length; i++, j++) {
+            if (s[i] != _s[j]) continue outer;
+          }
+          _pos += s.length;
+          return t.key;
+        }
+        return null;
+      });
+}
+
+bool isDigit(int c) => c >= char0 && c <= char9;
+
+bool isAlphaNum(int c) =>
+    (c >= char0 && c <= char9) ||
+    (c >= charLowerA && c <= charLowerZ) ||
+    (c >= charUpperA && c <= charUpperZ);

packages/simplexmq/lib/src/protocol.dart

@@ -0,0 +1,268 @@
+import 'dart:typed_data';
+import 'buffer.dart';
+import 'parser.dart';
+
+abstract class SMPCommand {
+  Uint8List serialize();
+}
+
+abstract class ClientCommand extends SMPCommand {}
+
+abstract class BrokerCommand extends SMPCommand {}
+
+final rsaPrefix = encodeAscii('rsa:');
+
+Uint8List serializePubKey(Uint8List rcvPubKey) =>
+    concat(rsaPrefix, encode64(rcvPubKey));
+
+final Uint8List cNEW = encodeAscii('NEW');
+final Uint8List cSUB = encodeAscii('SUB');
+final Uint8List cKEY = encodeAscii('KEY');
+final Uint8List cACK = encodeAscii('ACK');
+final Uint8List cOFF = encodeAscii('OFF');
+final Uint8List cDEL = encodeAscii('DEL');
+final Uint8List cSEND = encodeAscii('SEND');
+final Uint8List cPING = encodeAscii('PING');
+final Uint8List cIDS = encodeAscii('IDS');
+final Uint8List cMSG = encodeAscii('MSG');
+final Uint8List cEND = encodeAscii('END');
+final Uint8List cOK = encodeAscii('OK');
+final Uint8List cERR = encodeAscii('ERR');
+final Uint8List cPONG = encodeAscii('PONG');
+
+enum SMPCmdTag {
+  NEW,
+  SUB,
+  KEY,
+  ACK,
+  OFF,
+  DEL,
+  SEND,
+  PING,
+  IDS,
+  MSG,
+  END,
+  OK,
+  ERR,
+  PONG,
+}
+
+final BinaryTags<SMPCmdTag> smpCmdTags = {
+  SMPCmdTag.NEW: cNEW,
+  SMPCmdTag.SUB: cSUB,
+  SMPCmdTag.KEY: cKEY,
+  SMPCmdTag.ACK: cACK,
+  SMPCmdTag.OFF: cOFF,
+  SMPCmdTag.DEL: cDEL,
+  SMPCmdTag.SEND: cSEND,
+  SMPCmdTag.PING: cPING,
+  SMPCmdTag.IDS: cIDS,
+  SMPCmdTag.MSG: cMSG,
+  SMPCmdTag.END: cEND,
+  SMPCmdTag.OK: cOK,
+  SMPCmdTag.ERR: cERR,
+  SMPCmdTag.PONG: cPONG,
+};
+
+class NEW extends ClientCommand {
+  final Uint8List rcvPubKey;
+  NEW(this.rcvPubKey);
+  @override
+  Uint8List serialize() => unwords(cNEW, serializePubKey(rcvPubKey));
+}
+
+class SUB extends ClientCommand {
+  @override
+  Uint8List serialize() => cSUB;
+}
+
+class KEY extends ClientCommand {
+  final Uint8List sndPubKey;
+  KEY(this.sndPubKey);
+  @override
+  Uint8List serialize() => unwords(cKEY, serializePubKey(sndPubKey));
+}
+
+class ACK extends ClientCommand {
+  @override
+  Uint8List serialize() => cACK;
+}
+
+class OFF extends ClientCommand {
+  @override
+  Uint8List serialize() => cOFF;
+}
+
+class DEL extends ClientCommand {
+  @override
+  Uint8List serialize() => cDEL;
+}
+
+List<Uint8List> serializeMsg(Uint8List msg) =>
+    [encodeAscii(msg.length.toString()), msg, empty];
+
+class SEND extends ClientCommand {
+  final Uint8List msgBody;
+  SEND(this.msgBody);
+  @override
+  Uint8List serialize() => unwordsN([cSEND, ...serializeMsg(msgBody)]);
+}
+
+class PING extends ClientCommand {
+  @override
+  Uint8List serialize() => cPING;
+}
+
+class IDS extends BrokerCommand {
+  final Uint8List rcvId;
+  final Uint8List sndId;
+  IDS(this.rcvId, this.sndId) : super();
+  @override
+  Uint8List serialize() => unwordsN([cIDS, encode64(rcvId), encode64(sndId)]);
+}
+
+class MSG extends BrokerCommand {
+  final Uint8List msgId;
+  final DateTime ts;
+  final Uint8List msgBody;
+  MSG(this.msgId, this.ts, this.msgBody);
+  @override
+  Uint8List serialize() => unwordsN([
+        cMSG,
+        encode64(msgId),
+        encodeAscii(ts.toIso8601String()),
+        ...serializeMsg(msgBody)
+      ]);
+}
+
+class END extends BrokerCommand {
+  @override
+  Uint8List serialize() => cEND;
+}
+
+class OK extends BrokerCommand {
+  @override
+  Uint8List serialize() => cOK;
+}
+
+enum ErrorType { BLOCK, CMD, AUTH, QUOTA, NO_MSG, INTERNAL }
+
+final BinaryTags<ErrorType> errorTags = {
+  ErrorType.BLOCK: encodeAscii('BLOCK'),
+  ErrorType.CMD: encodeAscii('CMD'),
+  ErrorType.AUTH: encodeAscii('AUTH'),
+  ErrorType.QUOTA: encodeAscii('QUOTA'),
+  ErrorType.NO_MSG: encodeAscii('NO_MSG'),
+  ErrorType.INTERNAL: encodeAscii('INTERNAL'),
+};
+
+enum CmdErrorType { PROHIBITED, KEY_SIZE, SYNTAX, NO_AUTH, HAS_AUTH, NO_QUEUE }
+
+final BinaryTags<CmdErrorType> cmdErrorTags = {
+  CmdErrorType.PROHIBITED: encodeAscii('PROHIBITED'),
+  CmdErrorType.KEY_SIZE: encodeAscii('KEY_SIZE'),
+  CmdErrorType.SYNTAX: encodeAscii('SYNTAX'),
+  CmdErrorType.NO_AUTH: encodeAscii('NO_AUTH'),
+  CmdErrorType.HAS_AUTH: encodeAscii('HAS_AUTH'),
+  CmdErrorType.NO_QUEUE: encodeAscii('NO_QUEUE'),
+};
+
+class ERR extends BrokerCommand {
+  final ErrorType err;
+  final CmdErrorType? cmdErr;
+  ERR(this.err)
+      : cmdErr = err == ErrorType.CMD
+            ? throw ArgumentError('CMD error should be created with ERR.CMD')
+            : null;
+  ERR.cmd(CmdErrorType this.cmdErr) : err = ErrorType.CMD;
+  @override
+  Uint8List serialize() {
+    final _err = errorTags[err]!;
+    return cmdErr == null
+        ? unwords(cERR, _err)
+        : unwordsN([cERR, _err, cmdErrorTags[cmdErr!]!]);
+  }
+}
+
+class PONG extends BrokerCommand {
+  @override
+  Uint8List serialize() => cPONG;
+}
+
+final Map<SMPCmdTag, SMPCommand? Function(Parser p)> smpCmdParsers = {
+  SMPCmdTag.NEW: (p) {
+    p.space();
+    final key = pubKeyP(p);
+    if (key != null) return NEW(key);
+  },
+  SMPCmdTag.SUB: (_) => SUB(),
+  SMPCmdTag.KEY: (p) {
+    p.space();
+    final key = pubKeyP(p);
+    if (key != null) return KEY(key);
+  },
+  SMPCmdTag.ACK: (_) => ACK(),
+  SMPCmdTag.OFF: (_) => OFF(),
+  SMPCmdTag.DEL: (_) => DEL(),
+  SMPCmdTag.SEND: (p) {
+    p.space();
+    final msg = messageP(p);
+    if (msg != null) return SEND(msg);
+  },
+  SMPCmdTag.PING: (_) => PING(),
+  SMPCmdTag.IDS: (p) {
+    p.space();
+    final rId = p.base64();
+    p.space();
+    final sId = p.base64();
+    if (rId != null && sId != null) return IDS(rId, sId);
+  },
+  SMPCmdTag.MSG: (p) {
+    p.space();
+    final msgId = p.base64();
+    p.space();
+    final ts = p.datetime();
+    p.space();
+    final msg = messageP(p);
+    if (msgId != null && ts != null && msg != null) return MSG(msgId, ts, msg);
+  },
+  SMPCmdTag.END: (_) => END(),
+  SMPCmdTag.OK: (_) => OK(),
+  SMPCmdTag.ERR: (p) {
+    p.space();
+    final err = p.someStr(errorTags);
+    if (err == ErrorType.CMD) {
+      p.space();
+      final cmdErr = p.someStr(cmdErrorTags);
+      if (cmdErr != null) return ERR.cmd(cmdErr);
+    } else if (err != null) {
+      return ERR(err);
+    }
+  },
+  SMPCmdTag.PONG: (_) => PONG(),
+};
+
+SMPCommand? smpCommandP(Parser p) {
+  final cmd = p.someStr(smpCmdTags);
+  return p.fail ? null : smpCmdParsers[cmd]!(p);
+}
+
+SMPCommand? parseSMPCommand(Uint8List s) {
+  final p = Parser(s);
+  final cmd = smpCommandP(p);
+  if (cmd != null && p.end) return cmd;
+}
+
+Uint8List? pubKeyP(Parser p) {
+  p.str(rsaPrefix);
+  return p.base64();
+}
+
+Uint8List? messageP(Parser p) {
+  final len = p.decimal();
+  p.space();
+  Uint8List? msg;
+  if (len != null) msg = p.take(len);
+  p.space();
+  return p.fail ? null : msg;
+}

packages/simplexmq/lib/src/rsa_keys.dart

@@ -0,0 +1,109 @@
+import 'dart:typed_data';
+import 'package:asn1lib/asn1lib.dart';
+import 'package:pointycastle/asymmetric/api.dart'
+    show RSAPublicKey, RSAPrivateKey;
+
+const _rsaOid = '1.2.840.113549.1.1.1';
+final _asnRsaOid = ASN1ObjectIdentifier.fromComponentString(_rsaOid);
+final _asn1Null = ASN1Null();
+
+ASN1Sequence _asn1Sequence(List<ASN1Object> elements) {
+  final seq = ASN1Sequence()..elements = elements;
+  return seq;
+}
+
+void _assertRsaAlgorithm(ASN1Sequence seq) {
+  if (seq.elements.isEmpty ||
+      seq.elements[0] is! ASN1ObjectIdentifier ||
+      (seq.elements[0] as ASN1ObjectIdentifier).identifier != _rsaOid) {
+    throw Exception('Invalid key algorithm identifier');
+  }
+}
+
+/// Decodes binary PKCS1 to [RSAPublicKey]
+RSAPublicKey decodeRsaPubKeyPKCS1(Uint8List bytes) {
+  final els = ASN1Sequence.fromBytes(bytes).elements;
+  if (els.length != 2 || els[0] is! ASN1Integer || els[1] is! ASN1Integer) {
+    throw Exception('Invalid PKCS1 encoding');
+  }
+  return RSAPublicKey(
+    (els[0] as ASN1Integer).valueAsBigInteger!,
+    (els[1] as ASN1Integer).valueAsBigInteger!,
+  );
+}
+
+/// Decodes binary SPKI to [RSAPublicKey]
+RSAPublicKey decodeRsaPubKey(Uint8List bytes) {
+  final els = ASN1Sequence.fromBytes(bytes).elements;
+  if (els.length != 2 || els[1] is! ASN1BitString || els[0] is! ASN1Sequence) {
+    throw Exception('Invalid SPKI structure');
+  }
+  _assertRsaAlgorithm(els[0] as ASN1Sequence);
+  return decodeRsaPubKeyPKCS1(els[1].valueBytes().sublist(1));
+}
+
+/// Encodes [key] as binary PKCS1
+Uint8List encodeRsaPubKeyPKCS1(RSAPublicKey key) =>
+    _asn1Sequence([ASN1Integer(key.modulus!), ASN1Integer(key.publicExponent!)])
+        .encodedBytes;
+
+/// Encodes [key] as binary SPKI
+Uint8List encodeRsaPubKey(RSAPublicKey key) => _asn1Sequence([
+      _asn1Sequence([_asnRsaOid, _asn1Null]),
+      ASN1BitString(encodeRsaPubKeyPKCS1(key))
+    ]).encodedBytes;
+
+/// Decodes binary PKCS1 to [RSAPrivateKey]
+RSAPrivateKey decodeRsaPrivKeyPKCS1(Uint8List bytes) {
+  final els = ASN1Sequence.fromBytes(bytes).elements;
+  if (els.length != 9 || els.any((el) => el is! ASN1Integer)) {
+    throw Exception('Invalid PKCS1 encoding');
+  }
+  return RSAPrivateKey(
+      (els[1] as ASN1Integer).valueAsBigInteger!,
+      (els[3] as ASN1Integer).valueAsBigInteger!,
+      (els[4] as ASN1Integer).valueAsBigInteger!,
+      (els[5] as ASN1Integer).valueAsBigInteger!);
+}
+
+/// Decodes binary PKCS8 to [RSAPrivateKey]
+RSAPrivateKey decodeRsaPrivKey(Uint8List bytes) {
+  final els = ASN1Sequence.fromBytes(bytes).elements;
+  if (els.length != 3 ||
+      els[1] is! ASN1Sequence ||
+      els[2] is! ASN1OctetString) {
+    throw Exception('Invalid PKCS8 structure');
+  }
+  _assertRsaAlgorithm(els[1] as ASN1Sequence);
+  return decodeRsaPrivKeyPKCS1(els[2].valueBytes());
+}
+
+final _asnZero = ASN1Integer(BigInt.from(0));
+
+/// Encodes [key] as PKCS1 binary
+Uint8List encodeRsaPrivKeyPKCS1(RSAPrivateKey key) {
+  final d = key.privateExponent!;
+  final p = key.p!;
+  final q = key.q!;
+  final dModP = d % (p - BigInt.from(1));
+  final dModQ = d % (q - BigInt.from(1));
+  final coefficient = q.modInverse(p);
+  return _asn1Sequence([
+    _asnZero,
+    ASN1Integer(key.modulus!),
+    ASN1Integer(key.publicExponent!),
+    ASN1Integer(d),
+    ASN1Integer(p),
+    ASN1Integer(q),
+    ASN1Integer(dModP),
+    ASN1Integer(dModQ),
+    ASN1Integer(coefficient),
+  ]).encodedBytes;
+}
+
+/// Encodes [key] as PKCS8 binary
+Uint8List encodeRsaPrivKey(RSAPrivateKey key) => _asn1Sequence([
+      _asnZero,
+      _asn1Sequence([_asnRsaOid, _asn1Null]),
+      ASN1OctetString(encodeRsaPrivKeyPKCS1(key))
+    ]).encodedBytes;

packages/simplexmq/lib/src/transport.dart

@@ -0,0 +1,310 @@
+import 'dart:async';
+import 'dart:typed_data';
+import 'package:pointycastle/asymmetric/api.dart';
+import 'package:pointycastle/digests/sha256.dart';
+import 'buffer.dart';
+import 'crypto.dart';
+import 'parser.dart';
+import 'protocol.dart';
+import 'rsa_keys.dart';
+
+abstract class Transport {
+  Future<Uint8List> read(int n);
+  Future<void> write(Uint8List data);
+  Future<void> close();
+}
+
+class SMPServer {
+  final String host;
+  final int? port;
+  final Uint8List? keyHash;
+  SMPServer(this.host, [this.port, this.keyHash]);
+}
+
+class SessionKey {
+  final AESKey aesKey;
+  final Uint8List baseIV;
+  int _counter = 0;
+  SessionKey._(this.aesKey, this.baseIV);
+  static SessionKey create() => SessionKey._(AESKey.random(), randomIV());
+  Uint8List serialize() => concat(aesKey.bytes, baseIV);
+}
+
+class ServerHeader {
+  final int blockSize;
+  final int keySize;
+  ServerHeader(this.blockSize, this.keySize);
+}
+
+class ServerHandshake {
+  final RSAPublicKey publicKey;
+  final int blockSize;
+  ServerHandshake(this.publicKey, this.blockSize);
+}
+
+typedef SMPVersion = List<int>;
+
+SMPVersion _currentSMPVersion = const [0, 4, 1, 0];
+const int _serverHeaderSize = 8;
+const int _binaryRsaTransport = 0;
+const int _transportBlockSize = 4096;
+const int _maxTransportBlockSize = 65536;
+
+class _Request {
+  final Uint8List queueId;
+  final Completer<BrokerResponse> completer = Completer();
+  _Request(this.queueId);
+}
+
+class Either<L, R> {
+  final L? left;
+  final R? right;
+  Either.left(L this.left) : right = null;
+  Either.right(R this.right) : left = null;
+}
+
+enum ClientErrorType { SMPServerError, SMPResponseError, SMPUnexpectedResponse }
+
+class BrokerResponse {
+  final BrokerCommand? command;
+  final ClientErrorType? errorType;
+  final ERR? error;
+  BrokerResponse(BrokerCommand this.command)
+      : errorType = null,
+        error = null;
+  BrokerResponse.error(ClientErrorType this.errorType, this.error)
+      : command = null;
+}
+
+class ClientTransmission {
+  final String corrId;
+  final Uint8List queueId;
+  final ClientCommand command;
+  ClientTransmission(this.corrId, this.queueId, this.command);
+
+  Uint8List serialize() =>
+      unwordsN([encodeAscii(corrId), encode64(queueId), command.serialize()]);
+}
+
+class BrokerTransmission {
+  final String corrId;
+  final Uint8List queueId;
+  final BrokerCommand? command;
+  final ERR? error;
+  BrokerTransmission(this.corrId, this.queueId, BrokerCommand this.command)
+      : error = null;
+  BrokerTransmission.error(this.corrId, this.queueId, ERR this.error)
+      : command = null;
+}
+
+final badBlock = BrokerTransmission.error('', empty, ERR(ErrorType.BLOCK));
+
+class SMPTransportClient {
+  final Transport _conn;
+  final _sndKey = SessionKey.create();
+  final _rcvKey = SessionKey.create();
+  final int blockSize;
+  int _corrId = 0;
+  bool _messageStreamCreated = false;
+  final Map<String, _Request> _sentCommands = {};
+  SMPTransportClient._(this._conn, this.blockSize);
+
+  static Future<SMPTransportClient> connect(Transport conn,
+      {Uint8List? keyHash, int? blockSize}) {
+    return _clientHandshake(conn, keyHash, blockSize);
+  }
+
+  Future<void> close() {
+    return _conn.close();
+  }
+
+  Future<BrokerResponse> sendSMPCommand(
+      RSAPrivateKey? key, Uint8List queueId, ClientCommand cmd) async {
+    final corrId = (++_corrId).toString();
+    final t = ClientTransmission(corrId, queueId, cmd).serialize();
+    final sig = key == null ? empty : encode64(signPSS(key, t));
+    final data = unwordsN([sig, t, empty]);
+    final r = _sentCommands[corrId] = _Request(queueId);
+    await _writeEncrypted(data);
+    return r.completer.future;
+  }
+
+  Stream<BrokerTransmission> messageStream() {
+    if (_messageStreamCreated) {
+      throw Exception('message stream already created');
+    }
+    _messageStreamCreated = true;
+    return _messageStream();
+  }
+
+  Stream<BrokerTransmission> _messageStream() async* {
+    try {
+      while (true) {
+        final block = await _readEncrypted();
+        final t = _parseBrokerTransmission(block);
+        if (t.corrId == '') {
+          yield t;
+        } else {
+          final r = _sentCommands.remove(t.corrId);
+          if (r == null) {
+            yield t;
+          } else {
+            final cmd = t.command;
+            r.completer.complete(r.queueId.equal(t.queueId)
+                ? cmd == null
+                    ? BrokerResponse.error(
+                        ClientErrorType.SMPResponseError, t.error)
+                    : cmd is ERR
+                        ? BrokerResponse.error(
+                            ClientErrorType.SMPServerError, cmd)
+                        : BrokerResponse(cmd)
+                : BrokerResponse.error(
+                    ClientErrorType.SMPUnexpectedResponse, null));
+          }
+        }
+      }
+    } catch (e) {
+      return;
+    }
+  }
+
+  static BrokerTransmission _parseBrokerTransmission(Uint8List s) {
+    final p = Parser(s);
+    p.space();
+    final cId = p.word();
+    p.space();
+    final queueId = p.tryParse((p) => p.base64()) ?? empty;
+    p.space();
+    if (p.fail || cId == null) return badBlock;
+    final corrId = decodeAscii(cId);
+    final command = smpCommandP(p);
+    if (command == null) {
+      return BrokerTransmission.error(
+          corrId, queueId, ERR.cmd(CmdErrorType.SYNTAX));
+    }
+    if (command is! BrokerCommand) {
+      return BrokerTransmission.error(
+          corrId, queueId, ERR.cmd(CmdErrorType.PROHIBITED));
+    }
+    final qErr = _tQueueError(queueId, command);
+    if (qErr != null) {
+      return BrokerTransmission.error(corrId, queueId, ERR.cmd(qErr));
+    }
+    return BrokerTransmission(corrId, queueId, command);
+  }
+
+  static CmdErrorType? _tQueueError(Uint8List queueId, BrokerCommand cmd) {
+    if (cmd is IDS || cmd is PONG) {
+      if (queueId.isNotEmpty) return CmdErrorType.HAS_AUTH;
+    } else if (cmd is! ERR && queueId.isEmpty) {
+      return CmdErrorType.NO_QUEUE;
+    }
+  }
+
+  static Future<SMPTransportClient> _clientHandshake(
+      Transport conn, Uint8List? keyHash, int? blkSize) async {
+    final srv = await _getHeaderAndPublicKey_1_2(conn, keyHash);
+    final t = SMPTransportClient._(conn, blkSize ?? srv.blockSize);
+    await t._sendEncryptedKeys_4(srv.publicKey);
+    _checkVersion(await t._getWelcome_6());
+    return t;
+  }
+
+  static Future<ServerHandshake> _getHeaderAndPublicKey_1_2(
+      Transport conn, Uint8List? keyHash) async {
+    final srvHeader = parseServerHeader(await conn.read(_serverHeaderSize));
+    final blkSize = srvHeader.blockSize;
+    if (blkSize < _transportBlockSize || blkSize > _maxTransportBlockSize) {
+      throw Exception('smp handshake header error: bad block size $blkSize');
+    }
+    final rawKey = await conn.read(srvHeader.keySize);
+    if (keyHash != null) validateKeyHash_2(rawKey, keyHash);
+    final serverKey = decodeRsaPubKey(rawKey);
+    return ServerHandshake(serverKey, blkSize);
+  }
+
+  static void validateKeyHash_2(Uint8List rawKey, Uint8List keyHash) {
+    if (keyHash.equal(SHA256Digest().process(rawKey))) return;
+    throw Exception('smp handshake error: bad key hash');
+  }
+
+  static ServerHeader parseServerHeader(Uint8List a) {
+    if (a.length != 8) {
+      throw Exception('smp handshake error: bad header size ${a.length}');
+    }
+    final v = ByteData.sublistView(a);
+    final blockSize = v.getUint32(0);
+    final transportMode = v.getUint16(4);
+    if (transportMode != _binaryRsaTransport) {
+      throw Exception('smp handshake error: bad transport mode $transportMode');
+    }
+    final keySize = v.getUint16(6);
+    return ServerHeader(blockSize, keySize);
+  }
+
+  Future<void> _sendEncryptedKeys_4(RSAPublicKey serverKey) async {
+    final header = encryptOAEP(serverKey, _clientHeader());
+    await _conn.write(header);
+  }
+
+  Uint8List _clientHeader() => concatN([
+        encodeInt32(blockSize),
+        encodeInt16(_binaryRsaTransport),
+        _sndKey.serialize(),
+        _rcvKey.serialize()
+      ]);
+
+  Future<SMPVersion> _getWelcome_6() async =>
+      _parseSMPVersion(await _readEncrypted());
+
+  static SMPVersion _parseSMPVersion(Uint8List block) {
+    final p = Parser(block);
+    final SMPVersion version = [0, 0, 0, 0];
+    void setVer(int i, int? v) {
+      if (v == null || p.fail) {
+        throw Exception('smp handshake error: bad version format');
+      }
+      version[i] = v;
+    }
+
+    for (var i = 0; i < 3; i++) {
+      final v = p.decimal();
+      p.char(charDot);
+      setVer(i, v);
+    }
+    final v = p.decimal();
+    p.space();
+    setVer(3, v);
+    return version;
+  }
+
+  static void _checkVersion(SMPVersion srvVersion) {
+    final s0 = srvVersion[0];
+    final c0 = _currentSMPVersion[0];
+    if (s0 > c0 || (s0 == c0 && srvVersion[1] > _currentSMPVersion[1])) {
+      throw Exception('smp handshake error: incompatible server version');
+    }
+  }
+
+  Future<Uint8List> _readEncrypted() async {
+    final block = await _conn.read(blockSize);
+    final iv = _nextIV(_rcvKey);
+    return decryptAES(_rcvKey.aesKey, iv, block);
+  }
+
+  Future<void> _writeEncrypted(Uint8List data) {
+    final iv = _nextIV(_sndKey);
+    final block = encryptAES(_sndKey.aesKey, iv, blockSize - 16, data);
+    return _conn.write(block);
+  }
+
+  static Uint8List _nextIV(SessionKey sk) {
+    final c = encodeInt32(sk._counter++);
+    final start = sk.baseIV.sublist(0, 4);
+    final rest = sk.baseIV.sublist(4);
+    for (int i = 0; i < 4; i++) {
+      start[i] ^= c[i];
+    }
+    return concat(start, rest);
+  }
+}

packages/simplexmq/pubspec.yaml

@@ -0,0 +1,20 @@
+name: simplexmq
+description: A starting point for Dart libraries or applications.
+version: 0.0.1
+publish_to: none
+
+environment:
+  sdk: '>=2.14.0 <3.0.0'
+
+dependencies:
+  asn1lib: ^1.0.2
+  pointycastle:
+    git:
+      url: https://github.com/simplex-chat/pc-dart.git
+      ref: nullsafety
+
+  # pointycastle: ^3.3.4
+
+dev_dependencies:
+  lints: ^1.0.0
+  test: ^1.16.0

packages/simplexmq/test/buffer_test.dart

@@ -0,0 +1,66 @@
+import 'dart:typed_data';
+import 'package:simplexmq/src/buffer.dart';
+import 'package:test/test.dart';
+
+final hello123 = Uint8List.fromList([104, 101, 108, 108, 111, 49, 50, 51]);
+
+class Base64Test {
+  final String description;
+  final String binary;
+  final String base64;
+
+  Base64Test(this.binary, this.base64) : description = binary;
+  Base64Test.withDescription(this.description, this.binary, this.base64);
+}
+
+void main() {
+  group('ascii encoding/decoding', () {
+    test('encodeAscii', () {
+      expect(encodeAscii('hello123'), hello123);
+    });
+
+    test('decodeAscii', () {
+      expect(decodeAscii(hello123), 'hello123');
+    });
+  });
+
+  group('base-64 encoding/decoding', () {
+    String allBinaryChars() {
+      final a = Uint8List(256);
+      for (var i = 0; i < 256; i++) {
+        a[i] = i;
+      }
+      return decodeAscii(a);
+    }
+
+    final base64tests = [
+      Base64Test('\x12\x34\x56\x78', 'EjRWeA=='),
+      Base64Test('hello123', 'aGVsbG8xMjM='),
+      Base64Test('Hello world', 'SGVsbG8gd29ybGQ='),
+      Base64Test('Hello worlds!', 'SGVsbG8gd29ybGRzIQ=='),
+      Base64Test('May', 'TWF5'),
+      Base64Test('Ma', 'TWE='),
+      Base64Test('M', 'TQ=='),
+      Base64Test.withDescription(
+        'all binary chars',
+        allBinaryChars(),
+        'AAECAwQFBgcICQoLDA0ODxAREhMUFRYXGBkaGxwdHh8gISIjJCUmJygpKissLS4vMDEyMzQ1Njc4OTo7PD0+P0BBQkNERUZHSElKS0xNTk9QUVJTVFVWV1hZWltcXV5fYGFiY2RlZmdoaWprbG1ub3BxcnN0dXZ3eHl6e3x9fn+AgYKDhIWGh4iJiouMjY6PkJGSk5SVlpeYmZqbnJ2en6ChoqOkpaanqKmqq6ytrq+wsbKztLW2t7i5uru8vb6/wMHCw8TFxsfIycrLzM3Oz9DR0tPU1dbX2Nna29zd3t/g4eLj5OXm5+jp6uvs7e7v8PHy8/T19vf4+fr7/P3+/w==',
+      ),
+    ];
+
+    test('encode64', () {
+      for (final t in base64tests) {
+        expect(encode64(encodeAscii(t.binary)), encodeAscii(t.base64));
+      }
+    });
+
+    test('decode64', () {
+      for (final t in base64tests) {
+        expect(decode64(encodeAscii(t.base64)), encodeAscii(t.binary));
+      }
+      expect(decode64(encodeAscii('TWE')), null);
+      expect(decode64(encodeAscii('TWE==')), null);
+      expect(decode64(encodeAscii('TW!=')), null);
+    });
+  });
+}

packages/simplexmq/test/crypto_test.dart

@@ -0,0 +1,29 @@
+import 'package:simplexmq/src/buffer.dart';
+import 'package:simplexmq/src/crypto.dart';
+import 'package:test/test.dart';
+
+void main() {
+  group('AES-GCM encryption with padding', () {
+    test('encrypt and decrypt', () {
+      final key = AESKey.random();
+      final iv = pseudoRandomBytes(16);
+      final data = encodeAscii('hello');
+      final cipherText = encryptAES(key, iv, 32, data);
+      expect(cipherText.length, 32 + 16);
+      final decrypted = decryptAES(key, iv, cipherText);
+      expect(decodeAscii(decrypted),
+          'hello' + List.filled(32 - 'hello'.length, '#').join());
+    });
+  });
+
+  group('RSA-OAEP encryption', () {
+    test('encrypt and decrypt', () {
+      final keyPair = generateRSAkeyPair();
+      final data = encodeAscii('hello there');
+      final cipherText = encryptOAEP(keyPair.publicKey, data);
+      expect(cipherText.length, 2048 ~/ 8);
+      final decrypted = decryptOAEP(keyPair.privateKey, cipherText);
+      expect(decodeAscii(decrypted), 'hello there');
+    });
+  });
+}

packages/simplexmq/test/protocol_test.dart

@@ -0,0 +1,105 @@
+import 'dart:typed_data';
+import 'package:simplexmq/src/buffer.dart';
+import 'package:simplexmq/src/protocol.dart';
+import 'package:test/test.dart';
+
+void main() {
+  group('Parsing & serializing SMP commands', () {
+    group('valid commands', () {
+      Null Function() parseSerialize(SMPCommand cmd) => () {
+            final s = cmd.serialize();
+            expect(parseSMPCommand(s)?.serialize(), s);
+            expect(parseSMPCommand(concat(s, Uint8List.fromList([charSpace]))),
+                null);
+          };
+
+      test('NEW', parseSerialize(NEW(encodeAscii('rsa:1234'))));
+      test('SUB', parseSerialize(SUB()));
+      test('KEY', parseSerialize(KEY(encodeAscii('rsa:1234'))));
+      test('ACK', parseSerialize(ACK()));
+      test('OFF', parseSerialize(OFF()));
+      test('DEL', parseSerialize(DEL()));
+      test('SEND', parseSerialize(SEND(encodeAscii('hello'))));
+      test('PING', parseSerialize(PING()));
+      test('IDS', parseSerialize(IDS(encodeAscii('abc'), encodeAscii('def'))));
+      test(
+          'MSG',
+          parseSerialize(MSG(encodeAscii('fgh'), DateTime.now().toUtc(),
+              encodeAscii('hello'))));
+      test('END', parseSerialize(END()));
+      test('OK', parseSerialize(OK()));
+      test('ERR', parseSerialize(ERR(ErrorType.AUTH)));
+      test('ERR CMD', parseSerialize(ERR.cmd(CmdErrorType.SYNTAX)));
+      test('PONG', parseSerialize(PONG()));
+    });
+
+    group('invalid commands', () {
+      void Function() parseFailure(String s) =>
+          () => expect(parseSMPCommand(encodeAscii(s)), null);
+
+      void Function() parseSuccess(String s) =>
+          () => expect(parseSMPCommand(encodeAscii(s)) is SMPCommand, true);
+
+      group('NEW', () {
+        test('ok', parseSuccess('NEW rsa:abcd'));
+        test('no key', parseFailure('NEW'));
+        test('invalid base64', parseFailure('NEW rsa:abc'));
+        test('double space', parseFailure('NEW  rsa:abcd'));
+      });
+
+      group('KEY', () {
+        test('ok', parseSuccess('KEY rsa:abcd'));
+        test('no key', parseFailure('KEY'));
+        test('invalid base64', parseFailure('KEY rsa:abc'));
+        test('double space', parseFailure('KEY  rsa:abcd'));
+      });
+
+      group('SEND', () {
+        test('ok', parseSuccess('SEND 5 hello '));
+        test('no size', parseFailure('SEND hello '));
+        test('incorrect size', parseFailure('SEND 6 hello '));
+        test('no trailing space', parseFailure('SEND 5 hello'));
+        test('double space 1', parseFailure('SEND  5 hello '));
+        test('double space 2', parseFailure('SEND 5  hello '));
+      });
+
+      group('IDS', () {
+        test('ok', parseSuccess('IDS abcd efgh'));
+        test('no IDs', parseFailure('IDS'));
+        test('only one ID', parseFailure('IDS abcd'));
+        test('invalid base64 1', parseFailure('IDS abc efgh'));
+        test('invalid base64 2', parseFailure('IDS abcd efg'));
+        test('double space 1', parseFailure('IDS  abcd efgh'));
+        test('double space 2', parseFailure('IDS abcd  efgh'));
+      });
+
+      group('MSG', () {
+        final String ts = '2021-10-03T10:50:59.895Z';
+        test('ok', parseSuccess('MSG abcd $ts 5 hello '));
+        test('invalid base64', parseFailure('MSG abc $ts 5 hello '));
+        test('invalid timestamp 1',
+            parseFailure('MSG abc 2021-10-03T10:50:59.895 5 hello '));
+        test('invalid timestamp 2',
+            parseFailure('MSG abc 2021-14-03T10:50:59.895Z 5 hello '));
+        test('no size', parseFailure('MSG abcd $ts hello '));
+        test('incorrect size', parseFailure('MSG abcd $ts 6 hello '));
+        test('no trailing space', parseFailure('MSG abcd $ts 5 hello'));
+        test('double space 1', parseFailure('MSG  abcd $ts 5 hello '));
+        test('double space 2', parseFailure('MSG abcd  $ts 5 hello '));
+        test('double space 3', parseFailure('MSG abcd $ts  5 hello '));
+        test('double space 4', parseFailure('MSG abcd $ts 5  hello '));
+      });
+
+      group('ERR', () {
+        test('ok 1', parseSuccess('ERR AUTH'));
+        test('ok 2', parseSuccess('ERR CMD SYNTAX'));
+        test('unknown error', parseFailure('ERR HELLO'));
+        test('unknown CMD error', parseFailure('ERR CMD HELLO'));
+        test('bad sub-error', parseFailure('ERR AUTH SYNTAX'));
+        test('double space 1', parseFailure('ERR  AUTH'));
+        test('double space 2', parseFailure('ERR  CMD SYNTAX'));
+        test('double space 3', parseFailure('ERR CMD  SYNTAX'));
+      });
+    });
+  });
+}