Add AMP cache broker for Snowflake.

.gitlab-ci.yml

@@ -83,19 +83,30 @@ android test:
 test_reproducible:
   stage: check_reproducibility
   script:
-    - "curl -X POST -F token=${RELEASE_CHECK_TOKEN} -F ref=master -F variables[APP]='briar' -F variables[RELEASE_TAG]=${CI_COMMIT_REF_NAME} https://code.briarproject.org/api/v4/projects/61/trigger/pipeline"
-    - "curl -X POST -F token=${RELEASE_JAR_CHECK_TOKEN} -F ref=main -F variables[APP]='briar-headless' -F variables[RELEASE_TAG]=${CI_COMMIT_REF_NAME} https://code.briarproject.org/api/v4/projects/307/trigger/pipeline"
+    - "curl -X POST -F token=${RELEASE_CHECK_TOKEN} -F ref=master -F variables[RELEASE_TAG]=${CI_COMMIT_REF_NAME} https://code.briarproject.org/api/v4/projects/61/trigger/pipeline"
   only:
     - tags
 
-mailbox integration test:
+.optional_tests:
   stage: optional_tests
   extends: .base-test
+
+bridge test:
+  extends: .optional_tests
   rules:
-    - changes:
-        - mailbox-integration-tests/**/*
+    - if: '$CI_PIPELINE_SOURCE == "schedule"'
       when: on_success
       allow_failure: false
+    - if: '$CI_COMMIT_TAG == null'
+      when: manual
+      allow_failure: true
+  script:
+    - OPTIONAL_TESTS=org.briarproject.bramble.plugin.tor.BridgeTest ./gradlew --info bramble-java:test --tests BridgeTest
+  timeout: 4h
+
+mailbox integration test:
+  extends: .optional_tests
+  rules:
     - if: '$CI_PIPELINE_SOURCE == "schedule"'
       when: on_success
     - if: '$CI_COMMIT_TAG == null'

.idea/codeStyles/Project.xml

@@ -35,6 +35,9 @@
       <option name="NAME_COUNT_TO_USE_STAR_IMPORT_FOR_MEMBERS" value="2147483647" />
       <option name="CODE_STYLE_DEFAULTS" value="KOTLIN_OFFICIAL" />
     </JetCodeStyleSettings>
+    <XML>
+      <option name="XML_LEGACY_SETTINGS_IMPORTED" value="true" />
+    </XML>
     <codeStyleSettings language="Groovy">
       <indentOptions>
         <option name="USE_TAB_CHARACTER" value="true" />

.idea/runConfigurations/BridgeTest.xml

@@ -0,0 +1,28 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="BridgeTest" type="GradleRunConfiguration" factoryName="Gradle">
+    <ExternalSystemSettings>
+      <option name="env">
+        <map>
+          <entry key="OPTIONAL_TESTS" value="org.briarproject.bramble.plugin.tor.BridgeTest" />
+        </map>
+      </option>
+      <option name="executionName" />
+      <option name="externalProjectPath" value="$PROJECT_DIR$" />
+      <option name="externalSystemIdString" value="GRADLE" />
+      <option name="scriptParameters" value="--tests &quot;org.briarproject.bramble.plugin.tor.BridgeTest&quot;" />
+      <option name="taskDescriptions">
+        <list />
+      </option>
+      <option name="taskNames">
+        <list>
+          <option value=":bramble-java:test" />
+        </list>
+      </option>
+      <option name="vmOptions" value="" />
+    </ExternalSystemSettings>
+    <ExternalSystemDebugServerProcess>false</ExternalSystemDebugServerProcess>
+    <ExternalSystemReattachDebugProcess>true</ExternalSystemReattachDebugProcess>
+    <DebugAllEnabled>false</DebugAllEnabled>
+    <method v="2" />
+  </configuration>
+</component>

README.md

@@ -1,7 +1,7 @@
 # Briar
 Briar is a messaging app designed for activists, journalists, and anyone else who needs a safe, easy and robust way to communicate.
 
-Unlike traditional messaging apps, Briar doesn't rely on a central server - messages are synchronized directly between the users' devices. 
+Unlike traditional messaging tools such as email, Twitter or Telegram, Briar doesn't rely on a central server - messages are synchronized directly between the users' devices. 
 
 If the Internet's down, Briar can sync via Bluetooth or Wi-Fi, keeping information flowing in a crisis. If the Internet's up, Briar can sync via the Tor network, protecting users and their relationships from surveillance.
 
@@ -14,16 +14,14 @@ You can also [download the APK file](https://briarproject.org/apk) directly from
 our site.
 
 ## Useful links
-[Project website](https://briarproject.org/)
+[briarproject.org](https://briarproject.org/)
 
 [Source code](https://code.briarproject.org/briar/briar/tree/master)
 
-[User manual](https://briarproject.org/manual/)
+[Manual](https://briarproject.org/manual/)
 
 [Wiki](https://code.briarproject.org/briar/briar/-/wikis/home)
 
-[Privacy policy](https://briarproject.org/privacy)
-
 ## Reproducible builds
 
 We provide [docker images](https://code.briarproject.org/briar/briar-reproducer#briar-reproducer)
@@ -35,5 +33,5 @@ for reproduction.
 
 ## Donate
 
-[![Donate using Liberapay](https://briarproject.org/img/liberapay.svg)](https://liberapay.com/Briar/donate)   
+[![Donate using Liberapay](https://briarproject.org/img/liberapay.svg)](https://liberapay.com/Briar/donate) [![Flattr this](https://briarproject.org/img/flattr-badge-large.png "Flattr this")](https://flattr.com/t/592836/)   
 Bitcoin and BCH: 1NZCKkUCtJV2U2Y9hDb9uq8S7ksFCFGR6K

bramble-android/build.gradle

@@ -1,24 +1,25 @@
+import com.android.build.gradle.tasks.MergeResources
+
 apply plugin: 'com.android.library'
 apply plugin: 'witness'
 apply from: 'witness.gradle'
 
 android {
-	compileSdkVersion 33
-	buildToolsVersion '33.0.0'
+	compileSdkVersion 30
+	buildToolsVersion '30.0.3'
 
 	packagingOptions {
 		doNotStrip '**/*.so'
 	}
 
 	defaultConfig {
-		minSdkVersion 21
-		targetSdkVersion 33
-		versionCode 10507
-		versionName "1.5.7"
+		minSdkVersion 16
+		targetSdkVersion 30
+		versionCode 10412
+		versionName "1.4.12"
 		consumerProguardFiles 'proguard-rules.txt'
 
 		testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
-		testInstrumentationRunnerArguments disableAnalytics: 'true'
 	}
 
 	compileOptions {
@@ -40,19 +41,8 @@ configurations {
 }
 
 dependencies {
-	api 'org.briarproject:dont-kill-me-lib:0.2.7'
-
-	// In theory this dependency shouldn't be needed, but without it Android Studio's linter will
-	// complain about unresolved symbols for bramble-api test classes in bramble-android tests,
-	// even though the bramble-api test classes are provided by the testImplementation dependency
-	// below and the compiler can find them
-	implementation project(':bramble-api')
-
-	implementation project(':bramble-core')
-
+	implementation project(path: ':bramble-core', configuration: 'default')
 	implementation 'androidx.annotation:annotation:1.5.0'
-	implementation "org.briarproject:onionwrapper-android:$onionwrapper_version"
-
 	tor "org.briarproject:tor-android:$tor_version"
 	tor "org.briarproject:obfs4proxy-android:$obfs4proxy_version"
 	tor "org.briarproject:snowflake-android:$snowflake_version"
@@ -62,33 +52,61 @@ dependencies {
 	compileOnly 'javax.annotation:jsr250-api:1.0'
 
 	testImplementation project(path: ':bramble-api', configuration: 'testOutput')
-
 	testImplementation "junit:junit:$junit_version"
 	testImplementation "org.jmock:jmock:$jmock_version"
 	testImplementation "org.jmock:jmock-junit4:$jmock_version"
 	testImplementation "org.jmock:jmock-imposters:$jmock_version"
 }
 
+def torBinariesDir = 'src/main/res/raw'
 def torLibsDir = 'src/main/jniLibs'
 
 task cleanTorBinaries {
-	outputs.dir torLibsDir
 	doLast {
-		delete fileTree(torLibsDir)
+		delete fileTree(torBinariesDir) { include '*.zip' }
+		delete fileTree(torLibsDir) { include '**/*.so' }
 	}
 }
 
 clean.dependsOn cleanTorBinaries
 
 task unpackTorBinaries {
-	outputs.dir torLibsDir
 	doLast {
-		copy {
-			from configurations.tor.collect { zipTree(it) }
-			into torLibsDir
+		configurations.tor.each { outer ->
+			zipTree(outer).each { inner ->
+				if (inner.name.endsWith('_arm_pie.zip')) {
+					copy {
+						from zipTree(inner)
+						into torLibsDir
+						rename '(.*)', 'armeabi-v7a/lib$1.so'
+					}
+				} else if (inner.name.endsWith('_arm64_pie.zip')) {
+					copy {
+						from zipTree(inner)
+						into torLibsDir
+						rename '(.*)', 'arm64-v8a/lib$1.so'
+					}
+				} else if (inner.name.endsWith('_x86_pie.zip')) {
+					copy {
+						from zipTree(inner)
+						into torLibsDir
+						rename '(.*)', 'x86/lib$1.so'
+					}
+				} else if (inner.name.endsWith('_x86_64_pie.zip')) {
+					copy {
+						from zipTree(inner)
+						into torLibsDir
+						rename '(.*)', 'x86_64/lib$1.so'
+					}
+				}
+			}
 		}
 	}
 	dependsOn cleanTorBinaries
 }
 
-preBuild.dependsOn unpackTorBinaries
+tasks.withType(MergeResources) {
+	inputs.dir torBinariesDir
+	inputs.dir torLibsDir
+	dependsOn unpackTorBinaries
+}

bramble-android/src/main/AndroidManifest.xml

@@ -1,28 +1,15 @@
-<manifest xmlns:android="http://schemas.android.com/apk/res/android"
-	xmlns:tools="http://schemas.android.com/tools"
-	package="org.briarproject.bramble">
+<manifest
+	package="org.briarproject.bramble"
+	xmlns:android="http://schemas.android.com/apk/res/android">
 
-	<uses-feature
-		android:name="android.hardware.bluetooth"
-		android:required="false" />
+	<uses-feature android:name="android.hardware.bluetooth" android:required="false"/>
 
-	<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
-	<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
-	<!-- The BLUETOOTH permission was supposed to be removed in API 31 but is still needed on some Xiaomi/Redmi/POCO devices running API 31 and Nubia devices running API 32 -->
-	<uses-permission
-		android:name="android.permission.BLUETOOTH"
-		android:maxSdkVersion="32" />
-	<uses-permission
-		android:name="android.permission.BLUETOOTH_ADMIN"
-		android:maxSdkVersion="30" />
-	<uses-permission
-		android:name="android.permission.BLUETOOTH_SCAN"
-		android:usesPermissionFlags="neverForLocation"
-		tools:targetApi="31" />
-	<uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
-	<uses-permission android:name="android.permission.BLUETOOTH_ADVERTISE" />
-	<uses-permission android:name="android.permission.INTERNET" />
-	<uses-permission android:name="android.permission.WAKE_LOCK" />
+	<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
+	<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
+	<uses-permission android:name="android.permission.BLUETOOTH"/>
+	<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
+	<uses-permission android:name="android.permission.INTERNET"/>
+	<uses-permission android:name="android.permission.WAKE_LOCK"/>
 
 	<application
 		android:allowBackup="false"

bramble-android/src/main/java/org/briarproject/bramble/BrambleAndroidModule.java

@@ -8,9 +8,7 @@ import org.briarproject.bramble.reporting.ReportingModule;
 import org.briarproject.bramble.socks.SocksModule;
 import org.briarproject.bramble.system.AndroidSystemModule;
 import org.briarproject.bramble.system.AndroidTaskSchedulerModule;
-import org.briarproject.bramble.system.AndroidWakeLockModule;
 import org.briarproject.bramble.system.AndroidWakefulIoExecutorModule;
-import org.briarproject.bramble.system.DefaultThreadFactoryModule;
 
 import dagger.Module;
 
@@ -20,8 +18,6 @@ import dagger.Module;
 		AndroidSystemModule.class,
 		AndroidTaskSchedulerModule.class,
 		AndroidWakefulIoExecutorModule.class,
-		AndroidWakeLockModule.class,
-		DefaultThreadFactoryModule.class,
 		CircumventionModule.class,
 		DnsModule.class,
 		ReportingModule.class,

bramble-android/src/main/java/org/briarproject/bramble/account/AndroidAccountManager.java

@@ -20,6 +20,7 @@ import javax.annotation.Nullable;
 import javax.annotation.concurrent.GuardedBy;
 import javax.inject.Inject;
 
+import static android.os.Build.VERSION.SDK_INT;
 import static java.util.Arrays.asList;
 import static java.util.logging.Level.INFO;
 import static org.briarproject.bramble.util.IoUtils.deleteFileOrDir;
@@ -104,11 +105,15 @@ class AndroidAccountManager extends AccountManagerImpl
 		}
 		files.add(appContext.getFilesDir());
 		addIfNotNull(files, appContext.getExternalCacheDir());
-		for (File file : appContext.getExternalCacheDirs()) {
-			addIfNotNull(files, file);
+		if (SDK_INT >= 19) {
+			for (File file : appContext.getExternalCacheDirs()) {
+				addIfNotNull(files, file);
+			}
 		}
-		for (File file : appContext.getExternalMediaDirs()) {
-			addIfNotNull(files, file);
+		if (SDK_INT >= 21) {
+			for (File file : appContext.getExternalMediaDirs()) {
+				addIfNotNull(files, file);
+			}
 		}
 		// Clear the cache directory but don't delete it
 		File cacheDir = appContext.getCacheDir();

bramble-android/src/main/java/org/briarproject/bramble/api/system/AndroidWakeLock.java

@@ -0,0 +1,19 @@
+package org.briarproject.bramble.api.system;
+
+import org.briarproject.nullsafety.NotNullByDefault;
+
+@NotNullByDefault
+public interface AndroidWakeLock {
+
+	/**
+	 * Acquires the wake lock. This has no effect if the wake lock has already
+	 * been acquired.
+	 */
+	void acquire();
+
+	/**
+	 * Releases the wake lock. This has no effect if the wake lock has already
+	 * been released.
+	 */
+	void release();
+}

bramble-android/src/main/java/org/briarproject/bramble/api/system/AndroidWakeLockManager.java

@@ -0,0 +1,38 @@
+package org.briarproject.bramble.api.system;
+
+import org.briarproject.nullsafety.NotNullByDefault;
+
+import java.util.concurrent.Executor;
+
+@NotNullByDefault
+public interface AndroidWakeLockManager {
+
+	/**
+	 * Creates a wake lock with the given tag. The tag is only used for
+	 * logging; the underlying OS wake lock will use its own tag.
+	 */
+	AndroidWakeLock createWakeLock(String tag);
+
+	/**
+	 * Runs the given task while holding a wake lock.
+	 */
+	void runWakefully(Runnable r, String tag);
+
+	/**
+	 * Submits the given task to the given executor while holding a wake lock.
+	 * The lock is released when the task completes, or if an exception is
+	 * thrown while submitting or running the task.
+	 */
+	void executeWakefully(Runnable r, Executor executor, String tag);
+
+	/**
+	 * Starts a dedicated thread to run the given task asynchronously. A wake
+	 * lock is acquired before starting the thread and released when the task
+	 * completes, or if an exception is thrown while starting the thread or
+	 * running the task.
+	 * <p>
+	 * This method should only be used for lifecycle management tasks that
+	 * can't be run on an executor.
+	 */
+	void executeWakefully(Runnable r, String tag);
+}

bramble-android/src/main/java/org/briarproject/bramble/battery/AndroidBatteryManager.java

@@ -5,7 +5,6 @@ import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
-import android.os.PowerManager;
 
 import org.briarproject.bramble.api.battery.BatteryManager;
 import org.briarproject.bramble.api.battery.event.BatteryEvent;
@@ -17,17 +16,10 @@ import java.util.logging.Logger;
 
 import javax.inject.Inject;
 
-import androidx.annotation.RequiresApi;
-
 import static android.content.Intent.ACTION_BATTERY_CHANGED;
 import static android.content.Intent.ACTION_POWER_CONNECTED;
 import static android.content.Intent.ACTION_POWER_DISCONNECTED;
 import static android.os.BatteryManager.EXTRA_PLUGGED;
-import static android.os.Build.VERSION.SDK_INT;
-import static android.os.PowerManager.ACTION_DEVICE_IDLE_MODE_CHANGED;
-import static android.os.PowerManager.ACTION_DEVICE_LIGHT_IDLE_MODE_CHANGED;
-import static android.os.PowerManager.ACTION_LOW_POWER_STANDBY_ENABLED_CHANGED;
-import static android.os.PowerManager.ACTION_POWER_SAVE_MODE_CHANGED;
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Logger.getLogger;
 
@@ -65,12 +57,6 @@ class AndroidBatteryManager implements BatteryManager, Service {
 		IntentFilter filter = new IntentFilter();
 		filter.addAction(ACTION_POWER_CONNECTED);
 		filter.addAction(ACTION_POWER_DISCONNECTED);
-		filter.addAction(ACTION_POWER_SAVE_MODE_CHANGED);
-		if (SDK_INT >= 23) filter.addAction(ACTION_DEVICE_IDLE_MODE_CHANGED);
-		if (SDK_INT >= 33) {
-			filter.addAction(ACTION_LOW_POWER_STANDBY_ENABLED_CHANGED);
-			filter.addAction(ACTION_DEVICE_LIGHT_IDLE_MODE_CHANGED);
-		}
 		appContext.registerReceiver(batteryReceiver, filter);
 	}
 
@@ -90,33 +76,6 @@ class AndroidBatteryManager implements BatteryManager, Service {
 				eventBus.broadcast(new BatteryEvent(true));
 			else if (ACTION_POWER_DISCONNECTED.equals(action))
 				eventBus.broadcast(new BatteryEvent(false));
-			else if (SDK_INT >= 23 &&
-					ACTION_DEVICE_IDLE_MODE_CHANGED.equals(action) &&
-					LOG.isLoggable(INFO)) {
-				LOG.info("Device idle mode changed to: " +
-						getPowerManager(ctx).isDeviceIdleMode());
-			} else if (SDK_INT >= 23 &&
-					ACTION_POWER_SAVE_MODE_CHANGED.equals(action) &&
-					LOG.isLoggable(INFO)) {
-				LOG.info("Power save mode changed to: " +
-						getPowerManager(ctx).isPowerSaveMode());
-			} else if (SDK_INT >= 33 && LOG.isLoggable(INFO) &&
-					ACTION_LOW_POWER_STANDBY_ENABLED_CHANGED.equals(action)) {
-				PowerManager powerManager =
-						ctx.getSystemService(PowerManager.class);
-				LOG.info("Low power standby now is: " +
-						powerManager.isLowPowerStandbyEnabled());
-			} else if (SDK_INT >= 33 && LOG.isLoggable(INFO) &&
-					ACTION_DEVICE_LIGHT_IDLE_MODE_CHANGED.equals(action)) {
-				PowerManager powerManager = getPowerManager(ctx);
-				LOG.info("Light idle mode now is: " +
-						powerManager.isDeviceLightIdleMode());
-			}
 		}
 	}
-
-	@RequiresApi(api = 23)
-	private PowerManager getPowerManager(Context ctx) {
-		return ctx.getSystemService(PowerManager.class);
-	}
 }

bramble-android/src/main/java/org/briarproject/bramble/network/AndroidNetworkManager.java

@@ -118,11 +118,6 @@ class AndroidNetworkManager implements NetworkManager, Service {
 		try {
 			NetworkInfo net = connectivityManager.getActiveNetworkInfo();
 			boolean connected = net != null && net.isConnected();
-			// Research into Android's behavior to check network connectivity
-			// (https://code.briarproject.org/briar/public-mesh-research/-/issues/19)
-			// has shown that NetworkInfo#isConnected() returns true if the device
-			// is connected to any Wifi, independent of whether any specific IP
-			// address can be reached using it or any domain names can be resolved.
 			boolean wifi = false, ipv6Only = false;
 			if (connected) {
 				wifi = net.getType() == TYPE_WIFI;

bramble-android/src/main/java/org/briarproject/bramble/plugin/bluetooth/AndroidBluetoothConnectionFactory.java

@@ -2,10 +2,10 @@ package org.briarproject.bramble.plugin.bluetooth;
 
 import android.bluetooth.BluetoothSocket;
 
-import org.briarproject.android.dontkillmelib.wakelock.AndroidWakeLockManager;
 import org.briarproject.bramble.api.io.TimeoutMonitor;
 import org.briarproject.bramble.api.plugin.duplex.DuplexPlugin;
 import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
+import org.briarproject.bramble.api.system.AndroidWakeLockManager;
 import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.io.IOException;

bramble-android/src/main/java/org/briarproject/bramble/plugin/bluetooth/AndroidBluetoothPlugin.java

@@ -1,6 +1,5 @@
 package org.briarproject.bramble.plugin.bluetooth;
 
-import android.annotation.SuppressLint;
 import android.app.Application;
 import android.bluetooth.BluetoothAdapter;
 import android.bluetooth.BluetoothDevice;
@@ -50,17 +49,16 @@ import static android.bluetooth.BluetoothAdapter.STATE_ON;
 import static android.bluetooth.BluetoothDevice.ACTION_FOUND;
 import static android.bluetooth.BluetoothDevice.DEVICE_TYPE_LE;
 import static android.bluetooth.BluetoothDevice.EXTRA_DEVICE;
+import static android.os.Build.VERSION.SDK_INT;
 import static java.util.Collections.shuffle;
 import static java.util.concurrent.TimeUnit.MILLISECONDS;
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
 import static java.util.logging.Logger.getLogger;
-import static org.briarproject.bramble.util.AndroidUtils.hasBtConnectPermission;
 import static org.briarproject.bramble.util.PrivacyUtils.scrubMacAddress;
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
-@SuppressLint("MissingPermission")
 class AndroidBluetoothPlugin extends
 		AbstractBluetoothPlugin<BluetoothSocket, BluetoothServerSocket> {
 
@@ -99,11 +97,6 @@ class AndroidBluetoothPlugin extends
 		this.clock = clock;
 	}
 
-	@Override
-	protected boolean isBluetoothAccessible() {
-		return hasBtConnectPermission(app);
-	}
-
 	@Override
 	public void start() throws PluginException {
 		super.start();
@@ -254,7 +247,7 @@ class AndroidBluetoothPlugin extends
 					} else if (ACTION_FOUND.equals(action)) {
 						BluetoothDevice d = i.getParcelableExtra(EXTRA_DEVICE);
 						// Ignore Bluetooth LE devices
-						if (d.getType() != DEVICE_TYPE_LE) {
+						if (SDK_INT < 18 || d.getType() != DEVICE_TYPE_LE) {
 							String address = d.getAddress();
 							if (LOG.isLoggable(INFO))
 								LOG.info("Discovered " +

bramble-android/src/main/java/org/briarproject/bramble/plugin/bluetooth/AndroidBluetoothPluginFactory.java

@@ -3,7 +3,6 @@ package org.briarproject.bramble.plugin.bluetooth;
 import android.app.Application;
 import android.bluetooth.BluetoothSocket;
 
-import org.briarproject.android.dontkillmelib.wakelock.AndroidWakeLockManager;
 import org.briarproject.bramble.api.event.EventBus;
 import org.briarproject.bramble.api.io.TimeoutMonitor;
 import org.briarproject.bramble.api.lifecycle.IoExecutor;
@@ -14,6 +13,7 @@ import org.briarproject.bramble.api.plugin.TransportId;
 import org.briarproject.bramble.api.plugin.duplex.DuplexPlugin;
 import org.briarproject.bramble.api.plugin.duplex.DuplexPluginFactory;
 import org.briarproject.bramble.api.system.AndroidExecutor;
+import org.briarproject.bramble.api.system.AndroidWakeLockManager;
 import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.bramble.api.system.WakefulIoExecutor;
 import org.briarproject.nullsafety.NotNullByDefault;

bramble-android/src/main/java/org/briarproject/bramble/plugin/bluetooth/AndroidBluetoothTransportConnection.java

@@ -2,11 +2,11 @@ package org.briarproject.bramble.plugin.bluetooth;
 
 import android.bluetooth.BluetoothSocket;
 
-import org.briarproject.android.dontkillmelib.wakelock.AndroidWakeLock;
-import org.briarproject.android.dontkillmelib.wakelock.AndroidWakeLockManager;
 import org.briarproject.bramble.api.io.TimeoutMonitor;
 import org.briarproject.bramble.api.plugin.Plugin;
 import org.briarproject.bramble.api.plugin.duplex.AbstractDuplexTransportConnection;
+import org.briarproject.bramble.api.system.AndroidWakeLock;
+import org.briarproject.bramble.api.system.AndroidWakeLockManager;
 import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.io.IOException;
@@ -33,10 +33,8 @@ class AndroidBluetoothTransportConnection
 		super(plugin);
 		this.connectionLimiter = connectionLimiter;
 		this.socket = socket;
-		InputStream socketIn = socket.getInputStream();
-		if (socketIn == null) throw new IOException();
-		in = timeoutMonitor.createTimeoutInputStream(socketIn,
-				plugin.getMaxIdleTime() * 2L);
+		in = timeoutMonitor.createTimeoutInputStream(
+				socket.getInputStream(), plugin.getMaxIdleTime() * 2);
 		wakeLock = wakeLockManager.createWakeLock("BluetoothConnection");
 		wakeLock.acquire();
 		String address = socket.getRemoteDevice().getAddress();
@@ -50,9 +48,7 @@ class AndroidBluetoothTransportConnection
 
 	@Override
 	protected OutputStream getOutputStream() throws IOException {
-		OutputStream socketOut = socket.getOutputStream();
-		if (socketOut == null) throw new IOException();
-		return socketOut;
+		return socket.getOutputStream();
 	}
 
 	@Override

bramble-android/src/main/java/org/briarproject/bramble/plugin/tcp/AndroidLanTcpPlugin.java

@@ -1,5 +1,6 @@
 package org.briarproject.bramble.plugin.tcp;
 
+import android.annotation.TargetApi;
 import android.app.Application;
 import android.net.ConnectivityManager;
 import android.net.LinkAddress;
@@ -36,6 +37,7 @@ import javax.net.SocketFactory;
 import static android.content.Context.CONNECTIVITY_SERVICE;
 import static android.content.Context.WIFI_SERVICE;
 import static android.net.NetworkCapabilities.TRANSPORT_WIFI;
+import static android.os.Build.VERSION.SDK_INT;
 import static java.util.Collections.emptyList;
 import static java.util.Collections.list;
 import static java.util.Collections.singletonList;
@@ -116,7 +118,7 @@ class AndroidLanTcpPlugin extends LanTcpPlugin {
 		// If there's no wifi IPv4 address, we might be a client on an
 		// IPv6-only wifi network. We can only detect this on API 21+
 		if (wifi == null) {
-			return getWifiClientIpv6Address();
+			return SDK_INT >= 21 ? getWifiClientIpv6Address() : null;
 		}
 		// Use the wifi IPv4 address to determine which interface's IPv6
 		// address we should return (if the interface has a suitable address)
@@ -170,6 +172,7 @@ class AndroidLanTcpPlugin extends LanTcpPlugin {
 	 * Returns a link-local IPv6 address for the wifi client interface, or null
 	 * if there's no such interface or it doesn't have a suitable address.
 	 */
+	@TargetApi(21)
 	@Nullable
 	private InetAddress getWifiClientIpv6Address() {
 		// https://issuetracker.google.com/issues/175055271
@@ -201,7 +204,6 @@ class AndroidLanTcpPlugin extends LanTcpPlugin {
 	@Nullable
 	private InetAddress getIpv6AddressForInterface(InetAddress ipv4) {
 		try {
-			// We may get an NPE from getByInetAddress() on Android 11
 			NetworkInterface iface = NetworkInterface.getByInetAddress(ipv4);
 			if (iface == null) return null;
 			for (InetAddress addr : list(iface.getInetAddresses())) {
@@ -209,7 +211,7 @@ class AndroidLanTcpPlugin extends LanTcpPlugin {
 			}
 			// No suitable address
 			return null;
-		} catch (SocketException | NullPointerException e) {
+		} catch (SocketException e) {
 			logException(LOG, WARNING, e);
 			return null;
 		}
@@ -232,6 +234,7 @@ class AndroidLanTcpPlugin extends LanTcpPlugin {
 	// On API 21 and later, a socket that is not created with the wifi
 	// network's socket factory may try to connect via another network
 	private SocketFactory getSocketFactory() {
+		if (SDK_INT < 21) return SocketFactory.getDefault();
 		// https://issuetracker.google.com/issues/175055271
 		try {
 			for (Network net : connectivityManager.getAllNetworks()) {
@@ -299,7 +302,7 @@ class AndroidLanTcpPlugin extends LanTcpPlugin {
 		Pair<InetAddress, Boolean> wifi = getWifiIpv4Address();
 		// If there's no wifi IPv4 address, we might be a client on an
 		// IPv6-only wifi network. We can only detect this on API 21+
-		if (wifi == null) {
+		if (wifi == null && SDK_INT >= 21) {
 			InetAddress ipv6 = getWifiClientIpv6Address();
 			if (ipv6 != null) return new Pair<>(ipv6, false);
 		}

bramble-android/src/main/java/org/briarproject/bramble/plugin/tor/AndroidTorPlugin.java

@@ -0,0 +1,238 @@
+package org.briarproject.bramble.plugin.tor;
+
+import android.app.Application;
+import android.content.pm.PackageInfo;
+import android.content.pm.PackageManager;
+import android.content.pm.PackageManager.NameNotFoundException;
+
+import org.briarproject.bramble.api.battery.BatteryManager;
+import org.briarproject.bramble.api.network.NetworkManager;
+import org.briarproject.bramble.api.plugin.Backoff;
+import org.briarproject.bramble.api.plugin.PluginCallback;
+import org.briarproject.bramble.api.system.AndroidWakeLock;
+import org.briarproject.bramble.api.system.AndroidWakeLockManager;
+import org.briarproject.bramble.api.system.Clock;
+import org.briarproject.bramble.api.system.LocationUtils;
+import org.briarproject.bramble.api.system.ResourceProvider;
+import org.briarproject.bramble.util.AndroidUtils;
+import org.briarproject.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.nullsafety.ParametersNotNullByDefault;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.Executor;
+import java.util.logging.Logger;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipInputStream;
+
+import javax.net.SocketFactory;
+
+import androidx.annotation.ChecksSdkIntAtLeast;
+
+import static android.os.Build.VERSION.SDK_INT;
+import static java.util.Arrays.asList;
+import static java.util.logging.Level.INFO;
+import static java.util.logging.Logger.getLogger;
+
+@MethodsNotNullByDefault
+@ParametersNotNullByDefault
+class AndroidTorPlugin extends TorPlugin {
+
+	private static final List<String> LIBRARY_ARCHITECTURES =
+			asList("armeabi-v7a", "arm64-v8a", "x86", "x86_64");
+
+	private static final String TOR_LIB_NAME = "libtor.so";
+	private static final String OBFS4_LIB_NAME = "libobfs4proxy.so";
+	private static final String SNOWFLAKE_LIB_NAME = "libsnowflake.so";
+
+	private static final Logger LOG =
+			getLogger(AndroidTorPlugin.class.getName());
+
+	private final Application app;
+	private final AndroidWakeLock wakeLock;
+	private final File torLib, obfs4Lib, snowflakeLib;
+
+	AndroidTorPlugin(Executor ioExecutor,
+			Executor wakefulIoExecutor,
+			Application app,
+			NetworkManager networkManager,
+			LocationUtils locationUtils,
+			SocketFactory torSocketFactory,
+			Clock clock,
+			ResourceProvider resourceProvider,
+			CircumventionProvider circumventionProvider,
+			BatteryManager batteryManager,
+			AndroidWakeLockManager wakeLockManager,
+			Backoff backoff,
+			TorRendezvousCrypto torRendezvousCrypto,
+			PluginCallback callback,
+			String architecture,
+			long maxLatency,
+			int maxIdleTime,
+			File torDirectory,
+			int torSocksPort,
+			int torControlPort) {
+		super(ioExecutor, wakefulIoExecutor, networkManager, locationUtils,
+				torSocketFactory, clock, resourceProvider,
+				circumventionProvider, batteryManager, backoff,
+				torRendezvousCrypto, callback, architecture, maxLatency,
+				maxIdleTime, torDirectory, torSocksPort, torControlPort);
+		this.app = app;
+		wakeLock = wakeLockManager.createWakeLock("TorPlugin");
+		String nativeLibDir = app.getApplicationInfo().nativeLibraryDir;
+		torLib = new File(nativeLibDir, TOR_LIB_NAME);
+		obfs4Lib = new File(nativeLibDir, OBFS4_LIB_NAME);
+		snowflakeLib = new File(nativeLibDir, SNOWFLAKE_LIB_NAME);
+	}
+
+	@Override
+	protected int getProcessId() {
+		return android.os.Process.myPid();
+	}
+
+	@Override
+	protected long getLastUpdateTime() {
+		try {
+			PackageManager pm = app.getPackageManager();
+			PackageInfo pi = pm.getPackageInfo(app.getPackageName(), 0);
+			return pi.lastUpdateTime;
+		} catch (NameNotFoundException e) {
+			throw new AssertionError(e);
+		}
+	}
+
+	@Override
+	protected void enableNetwork(boolean enable) throws IOException {
+		if (enable) wakeLock.acquire();
+		super.enableNetwork(enable);
+		if (!enable) wakeLock.release();
+	}
+
+	@Override
+	@ChecksSdkIntAtLeast(api = 25)
+	protected boolean canVerifyLetsEncryptCerts() {
+		return SDK_INT >= 25;
+	}
+
+	@Override
+	public void stop() {
+		super.stop();
+		wakeLock.release();
+	}
+
+	@Override
+	protected File getTorExecutableFile() {
+		return torLib.exists() ? torLib : super.getTorExecutableFile();
+	}
+
+	@Override
+	protected File getObfs4ExecutableFile() {
+		return obfs4Lib.exists() ? obfs4Lib : super.getObfs4ExecutableFile();
+	}
+
+	@Override
+	protected File getSnowflakeExecutableFile() {
+		return snowflakeLib.exists()
+				? snowflakeLib : super.getSnowflakeExecutableFile();
+	}
+
+	@Override
+	protected void installTorExecutable() throws IOException {
+		installExecutable(super.getTorExecutableFile(), torLib, TOR_LIB_NAME);
+	}
+
+	@Override
+	protected void installObfs4Executable() throws IOException {
+		installExecutable(super.getObfs4ExecutableFile(), obfs4Lib,
+				OBFS4_LIB_NAME);
+	}
+
+	@Override
+	protected void installSnowflakeExecutable() throws IOException {
+		installExecutable(super.getSnowflakeExecutableFile(), snowflakeLib,
+				SNOWFLAKE_LIB_NAME);
+	}
+
+	private void installExecutable(File extracted, File lib, String libName)
+			throws IOException {
+		if (lib.exists()) {
+			// If an older version left behind a binary, delete it
+			if (extracted.exists()) {
+				if (extracted.delete()) LOG.info("Deleted old binary");
+				else LOG.info("Failed to delete old binary");
+			}
+		} else if (SDK_INT < 29) {
+			// The binary wasn't extracted at install time. Try to extract it
+			extractLibraryFromApk(libName, extracted);
+		} else {
+			// No point extracting the binary, we won't be allowed to execute it
+			throw new FileNotFoundException(lib.getAbsolutePath());
+		}
+	}
+
+	private void extractLibraryFromApk(String libName, File dest)
+			throws IOException {
+		File sourceDir = new File(app.getApplicationInfo().sourceDir);
+		if (sourceDir.isFile()) {
+			// Look for other APK files in the same directory, if we're allowed
+			File parent = sourceDir.getParentFile();
+			if (parent != null) sourceDir = parent;
+		}
+		List<String> libPaths = getSupportedLibraryPaths(libName);
+		for (File apk : findApkFiles(sourceDir)) {
+			ZipInputStream zin = new ZipInputStream(new FileInputStream(apk));
+			for (ZipEntry e = zin.getNextEntry(); e != null;
+					e = zin.getNextEntry()) {
+				if (libPaths.contains(e.getName())) {
+					if (LOG.isLoggable(INFO)) {
+						LOG.info("Extracting " + e.getName()
+								+ " from " + apk.getAbsolutePath());
+					}
+					extract(zin, dest); // Zip input stream will be closed
+					return;
+				}
+			}
+			zin.close();
+		}
+		throw new FileNotFoundException(libName);
+	}
+
+	/**
+	 * Returns all files with the extension .apk or .APK under the given root.
+	 */
+	private List<File> findApkFiles(File root) {
+		List<File> files = new ArrayList<>();
+		findApkFiles(root, files);
+		return files;
+	}
+
+	private void findApkFiles(File f, List<File> files) {
+		if (f.isFile() && f.getName().toLowerCase().endsWith(".apk")) {
+			files.add(f);
+		} else if (f.isDirectory()) {
+			File[] children = f.listFiles();
+			if (children != null) {
+				for (File child : children) findApkFiles(child, files);
+			}
+		}
+	}
+
+	/**
+	 * Returns the paths at which libraries with the given name would be found
+	 * inside an APK file, for all architectures supported by the device, in
+	 * order of preference.
+	 */
+	private List<String> getSupportedLibraryPaths(String libName) {
+		List<String> architectures = new ArrayList<>();
+		for (String abi : AndroidUtils.getSupportedArchitectures()) {
+			if (LIBRARY_ARCHITECTURES.contains(abi)) {
+				architectures.add("lib/" + abi + "/" + libName);
+			}
+		}
+		return architectures;
+	}
+}

bramble-android/src/main/java/org/briarproject/bramble/plugin/tor/AndroidTorPluginFactory.java

@@ -2,11 +2,9 @@ package org.briarproject.bramble.plugin.tor;
 
 import android.app.Application;
 
-import org.briarproject.android.dontkillmelib.wakelock.AndroidWakeLockManager;
 import org.briarproject.bramble.api.battery.BatteryManager;
 import org.briarproject.bramble.api.crypto.CryptoComponent;
 import org.briarproject.bramble.api.event.EventBus;
-import org.briarproject.bramble.api.event.EventExecutor;
 import org.briarproject.bramble.api.lifecycle.IoExecutor;
 import org.briarproject.bramble.api.network.NetworkManager;
 import org.briarproject.bramble.api.plugin.Backoff;
@@ -15,13 +13,12 @@ import org.briarproject.bramble.api.plugin.PluginCallback;
 import org.briarproject.bramble.api.plugin.TorControlPort;
 import org.briarproject.bramble.api.plugin.TorDirectory;
 import org.briarproject.bramble.api.plugin.TorSocksPort;
+import org.briarproject.bramble.api.system.AndroidWakeLockManager;
 import org.briarproject.bramble.api.system.Clock;
+import org.briarproject.bramble.api.system.LocationUtils;
+import org.briarproject.bramble.api.system.ResourceProvider;
 import org.briarproject.bramble.api.system.WakefulIoExecutor;
 import org.briarproject.nullsafety.NotNullByDefault;
-import org.briarproject.onionwrapper.AndroidTorWrapper;
-import org.briarproject.onionwrapper.CircumventionProvider;
-import org.briarproject.onionwrapper.LocationUtils;
-import org.briarproject.onionwrapper.TorWrapper;
 
 import java.io.File;
 import java.util.concurrent.Executor;
@@ -31,7 +28,6 @@ import javax.annotation.concurrent.Immutable;
 import javax.inject.Inject;
 import javax.net.SocketFactory;
 
-import static android.os.Build.VERSION.SDK_INT;
 import static org.briarproject.bramble.util.AndroidUtils.getSupportedArchitectures;
 
 @Immutable
@@ -43,13 +39,13 @@ public class AndroidTorPluginFactory extends TorPluginFactory {
 
 	@Inject
 	AndroidTorPluginFactory(@IoExecutor Executor ioExecutor,
-			@EventExecutor Executor eventExecutor,
 			@WakefulIoExecutor Executor wakefulIoExecutor,
 			NetworkManager networkManager,
 			LocationUtils locationUtils,
 			EventBus eventBus,
 			SocketFactory torSocketFactory,
 			BackoffFactory backoffFactory,
+			ResourceProvider resourceProvider,
 			CircumventionProvider circumventionProvider,
 			BatteryManager batteryManager,
 			Clock clock,
@@ -59,8 +55,8 @@ public class AndroidTorPluginFactory extends TorPluginFactory {
 			@TorControlPort int torControlPort,
 			Application app,
 			AndroidWakeLockManager wakeLockManager) {
-		super(ioExecutor, eventExecutor, wakefulIoExecutor, networkManager,
-				locationUtils, eventBus, torSocketFactory, backoffFactory,
+		super(ioExecutor, wakefulIoExecutor, networkManager, locationUtils,
+				eventBus, torSocketFactory, backoffFactory, resourceProvider,
 				circumventionProvider, batteryManager, clock, crypto,
 				torDirectory, torSocksPort, torControlPort);
 		this.app = app;
@@ -83,18 +79,12 @@ public class AndroidTorPluginFactory extends TorPluginFactory {
 	TorPlugin createPluginInstance(Backoff backoff,
 			TorRendezvousCrypto torRendezvousCrypto, PluginCallback callback,
 			String architecture) {
-		TorWrapper tor = new AndroidTorWrapper(app, wakeLockManager,
-				ioExecutor, eventExecutor, architecture, torDirectory,
-				torSocksPort, torControlPort);
-		// Android versions 7.1 and newer can verify Let's Encrypt TLS certs
-		// signed with the IdentTrust DST Root X3 certificate. Older versions
-		// of Android consider the certificate to have expired at the end of
-		// September 2021.
-		boolean canVerifyLetsEncryptCerts = SDK_INT >= 25;
-		return new TorPlugin(ioExecutor, wakefulIoExecutor,
-				networkManager, locationUtils, torSocketFactory,
-				circumventionProvider, batteryManager, backoff,
-				torRendezvousCrypto, tor, callback, MAX_LATENCY,
-				MAX_IDLE_TIME, canVerifyLetsEncryptCerts);
+		return new AndroidTorPlugin(ioExecutor,
+				wakefulIoExecutor, app, networkManager, locationUtils,
+				torSocketFactory, clock, resourceProvider,
+				circumventionProvider, batteryManager, wakeLockManager,
+				backoff, torRendezvousCrypto, callback, architecture,
+				MAX_LATENCY, MAX_IDLE_TIME, torDirectory, torSocksPort,
+				torControlPort);
 	}
 }

bramble-android/src/main/java/org/briarproject/bramble/system/AndroidLocationUtils.java

@@ -0,0 +1,72 @@
+package org.briarproject.bramble.system;
+
+import android.annotation.SuppressLint;
+import android.app.Application;
+import android.content.Context;
+import android.telephony.TelephonyManager;
+import android.text.TextUtils;
+
+import org.briarproject.bramble.api.system.LocationUtils;
+import org.briarproject.nullsafety.NotNullByDefault;
+
+import java.util.Locale;
+import java.util.logging.Logger;
+
+import javax.inject.Inject;
+
+import static android.content.Context.TELEPHONY_SERVICE;
+
+@NotNullByDefault
+class AndroidLocationUtils implements LocationUtils {
+
+	private static final Logger LOG =
+			Logger.getLogger(AndroidLocationUtils.class.getName());
+
+	private final Context appContext;
+
+	@Inject
+	AndroidLocationUtils(Application app) {
+		appContext = app.getApplicationContext();
+	}
+
+	/**
+	 * This guesses the current country from the first of these sources that
+	 * succeeds (also in order of likelihood of being correct):
+	 *
+	 * <ul>
+	 * <li>Phone network. This works even when no SIM card is inserted, or a
+	 *     foreign SIM card is inserted.</li>
+	 * <li>SIM card. This is only an heuristic and assumes the user is not
+	 *     roaming.</li>
+	 * <li>User locale. This is an even worse heuristic.</li>
+	 * </ul>
+	 *
+	 * Note: this is very similar to <a href="https://android.googlesource.com/platform/frameworks/base/+/cd92588%5E/location/java/android/location/CountryDetector.java">
+	 * this API</a> except it seems that Google doesn't want us to use it for
+	 * some reason - both that class and {@code Context.COUNTRY_CODE} are
+	 * annotated {@code @hide}.
+	 */
+	@Override
+	@SuppressLint("DefaultLocale")
+	public String getCurrentCountry() {
+		String countryCode = getCountryFromPhoneNetwork();
+		if (!TextUtils.isEmpty(countryCode)) return countryCode.toUpperCase();
+		LOG.info("Falling back to SIM card country");
+		countryCode = getCountryFromSimCard();
+		if (!TextUtils.isEmpty(countryCode)) return countryCode.toUpperCase();
+		LOG.info("Falling back to user-defined locale");
+		return Locale.getDefault().getCountry();
+	}
+
+	private String getCountryFromPhoneNetwork() {
+		Object o = appContext.getSystemService(TELEPHONY_SERVICE);
+		TelephonyManager tm = (TelephonyManager) o;
+		return tm == null ? "" : tm.getNetworkCountryIso();
+	}
+
+	private String getCountryFromSimCard() {
+		Object o = appContext.getSystemService(TELEPHONY_SERVICE);
+		TelephonyManager tm = (TelephonyManager) o;
+		return tm == null ? "" : tm.getSimCountryIso();
+	}
+}

bramble-android/src/main/java/org/briarproject/bramble/system/AndroidSecureRandomProvider.java

@@ -6,6 +6,7 @@ import android.bluetooth.BluetoothAdapter;
 import android.bluetooth.BluetoothDevice;
 import android.content.ContentResolver;
 import android.content.Context;
+import android.os.Build;
 import android.os.Parcel;
 import android.os.StrictMode;
 import android.provider.Settings;
@@ -14,23 +15,19 @@ import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.io.DataOutputStream;
 import java.io.IOException;
-import java.util.Set;
 
 import javax.annotation.concurrent.Immutable;
 import javax.inject.Inject;
 
-import static android.os.Build.FINGERPRINT;
-import static android.os.Build.SERIAL;
 import static android.os.Build.VERSION.SDK_INT;
-import static android.os.Process.myPid;
-import static android.os.Process.myTid;
-import static android.os.Process.myUid;
 import static android.provider.Settings.Secure.ANDROID_ID;
 
 @Immutable
 @NotNullByDefault
 class AndroidSecureRandomProvider extends UnixSecureRandomProvider {
 
+	private static final int SEED_LENGTH = 32;
+
 	private final Context appContext;
 
 	@Inject
@@ -42,27 +39,22 @@ class AndroidSecureRandomProvider extends UnixSecureRandomProvider {
 	@Override
 	protected void writeToEntropyPool(DataOutputStream out) throws IOException {
 		super.writeToEntropyPool(out);
-		out.writeInt(myPid());
-		out.writeInt(myTid());
-		out.writeInt(myUid());
-		if (FINGERPRINT != null) out.writeUTF(FINGERPRINT);
-		if (SERIAL != null) out.writeUTF(SERIAL);
+		out.writeInt(android.os.Process.myPid());
+		out.writeInt(android.os.Process.myTid());
+		out.writeInt(android.os.Process.myUid());
+		if (Build.FINGERPRINT != null) out.writeUTF(Build.FINGERPRINT);
+		if (Build.SERIAL != null) out.writeUTF(Build.SERIAL);
 		ContentResolver contentResolver = appContext.getContentResolver();
 		String id = Settings.Secure.getString(contentResolver, ANDROID_ID);
 		if (id != null) out.writeUTF(id);
-		// On API 31 and higher we need permission to access bonded devices
-		if (SDK_INT < 31) {
-			Parcel parcel = Parcel.obtain();
-			BluetoothAdapter bt = BluetoothAdapter.getDefaultAdapter();
-			if (bt != null) {
-				@SuppressLint("MissingPermission")
-				Set<BluetoothDevice> deviceSet = bt.getBondedDevices();
-				for (BluetoothDevice device : deviceSet)
-					parcel.writeParcelable(device, 0);
-			}
-			out.write(parcel.marshall());
-			parcel.recycle();
+		Parcel parcel = Parcel.obtain();
+		BluetoothAdapter bt = BluetoothAdapter.getDefaultAdapter();
+		if (bt != null) {
+			for (BluetoothDevice device : bt.getBondedDevices())
+				parcel.writeParcelable(device, 0);
 		}
+		out.write(parcel.marshall());
+		parcel.recycle();
 	}
 
 	@Override
@@ -70,6 +62,27 @@ class AndroidSecureRandomProvider extends UnixSecureRandomProvider {
 		// Silence strict mode
 		StrictMode.ThreadPolicy tp = StrictMode.allowThreadDiskWrites();
 		super.writeSeed();
+		if (SDK_INT <= 18) applyOpenSslFix();
 		StrictMode.setThreadPolicy(tp);
 	}
+
+	// Based on https://android-developers.googleblog.com/2013/08/some-securerandom-thoughts.html
+	private void applyOpenSslFix() {
+		byte[] seed = new UnixSecureRandomSpi().engineGenerateSeed(
+				SEED_LENGTH);
+		try {
+			// Seed the OpenSSL PRNG
+			Class.forName("org.apache.harmony.xnet.provider.jsse.NativeCrypto")
+					.getMethod("RAND_seed", byte[].class)
+					.invoke(null, (Object) seed);
+			// Mix the output of the Linux PRNG into the OpenSSL PRNG
+			int bytesRead = (Integer) Class.forName(
+					"org.apache.harmony.xnet.provider.jsse.NativeCrypto")
+					.getMethod("RAND_load_file", String.class, long.class)
+					.invoke(null, "/dev/urandom", 1024);
+			if (bytesRead != 1024) throw new IOException();
+		} catch (Exception e) {
+			throw new SecurityException(e);
+		}
+	}
 }

bramble-android/src/main/java/org/briarproject/bramble/system/AndroidSystemModule.java

@@ -1,14 +1,12 @@
 package org.briarproject.bramble.system;
 
-import android.app.Application;
-
 import org.briarproject.bramble.api.event.EventExecutor;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager;
 import org.briarproject.bramble.api.system.AndroidExecutor;
+import org.briarproject.bramble.api.system.AndroidWakeLockManager;
+import org.briarproject.bramble.api.system.LocationUtils;
 import org.briarproject.bramble.api.system.ResourceProvider;
 import org.briarproject.bramble.api.system.SecureRandomProvider;
-import org.briarproject.onionwrapper.AndroidLocationUtilsFactory;
-import org.briarproject.onionwrapper.LocationUtils;
 
 import java.util.concurrent.Executor;
 import java.util.concurrent.RejectedExecutionHandler;
@@ -48,9 +46,8 @@ public class AndroidSystemModule {
 	}
 
 	@Provides
-	@Singleton
-	LocationUtils provideLocationUtils(Application app) {
-		return AndroidLocationUtilsFactory.createAndroidLocationUtils(app);
+	LocationUtils provideLocationUtils(AndroidLocationUtils locationUtils) {
+		return locationUtils;
 	}
 
 	@Provides
@@ -72,4 +69,11 @@ public class AndroidSystemModule {
 	ResourceProvider provideResourceProvider(AndroidResourceProvider provider) {
 		return provider;
 	}
+
+	@Provides
+	@Singleton
+	AndroidWakeLockManager provideWakeLockManager(
+			AndroidWakeLockManagerImpl wakeLockManager) {
+		return wakeLockManager;
+	}
 }

bramble-android/src/main/java/org/briarproject/bramble/system/AndroidTaskScheduler.java

@@ -8,10 +8,10 @@ import android.content.Intent;
 import android.os.Process;
 import android.os.SystemClock;
 
-import org.briarproject.android.dontkillmelib.wakelock.AndroidWakeLockManager;
 import org.briarproject.bramble.api.Cancellable;
 import org.briarproject.bramble.api.lifecycle.Service;
 import org.briarproject.bramble.api.system.AlarmListener;
+import org.briarproject.bramble.api.system.AndroidWakeLockManager;
 import org.briarproject.bramble.api.system.TaskScheduler;
 import org.briarproject.bramble.api.system.Wakeful;
 import org.briarproject.nullsafety.NotNullByDefault;
@@ -41,7 +41,6 @@ import static java.util.logging.Level.INFO;
 import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.system.AlarmConstants.EXTRA_PID;
 import static org.briarproject.bramble.system.AlarmConstants.REQUEST_ALARM;
-import static org.briarproject.bramble.util.AndroidUtils.getImmutableFlags;
 
 @ThreadSafe
 @NotNullByDefault
@@ -200,7 +199,7 @@ class AndroidTaskScheduler implements TaskScheduler, Service, AlarmListener {
 		Intent i = new Intent(app, AlarmReceiver.class);
 		i.putExtra(EXTRA_PID, android.os.Process.myPid());
 		return PendingIntent.getBroadcast(app, REQUEST_ALARM, i,
-				getImmutableFlags(FLAG_CANCEL_CURRENT));
+				FLAG_CANCEL_CURRENT);
 	}
 
 	private class ScheduledTask

bramble-android/src/main/java/org/briarproject/bramble/system/AndroidTaskSchedulerModule.java

@@ -2,9 +2,9 @@ package org.briarproject.bramble.system;
 
 import android.app.Application;
 
-import org.briarproject.android.dontkillmelib.wakelock.AndroidWakeLockManager;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager;
 import org.briarproject.bramble.api.system.AlarmListener;
+import org.briarproject.bramble.api.system.AndroidWakeLockManager;
 import org.briarproject.bramble.api.system.TaskScheduler;
 
 import java.util.concurrent.ScheduledExecutorService;

bramble-android/src/main/java/org/briarproject/bramble/system/AndroidWakeLockImpl.java

@@ -0,0 +1,74 @@
+package org.briarproject.bramble.system;
+
+import org.briarproject.bramble.api.system.AndroidWakeLock;
+import org.briarproject.nullsafety.NotNullByDefault;
+
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.logging.Logger;
+
+import javax.annotation.concurrent.GuardedBy;
+import javax.annotation.concurrent.ThreadSafe;
+
+import static java.util.logging.Level.FINE;
+import static java.util.logging.Logger.getLogger;
+
+/**
+ * A wrapper around a {@link SharedWakeLock} that provides the more convenient
+ * semantics of {@link AndroidWakeLock} (i.e. calls to acquire() and release()
+ * don't need to be balanced).
+ */
+@ThreadSafe
+@NotNullByDefault
+class AndroidWakeLockImpl implements AndroidWakeLock {
+
+	private static final Logger LOG =
+			getLogger(AndroidWakeLockImpl.class.getName());
+
+	private static final AtomicInteger INSTANCE_ID = new AtomicInteger(0);
+
+	private final SharedWakeLock sharedWakeLock;
+	private final String tag;
+
+	private final Object lock = new Object();
+	@GuardedBy("lock")
+	private boolean held = false;
+
+	AndroidWakeLockImpl(SharedWakeLock sharedWakeLock, String tag) {
+		this.sharedWakeLock = sharedWakeLock;
+		this.tag = tag + "_" + INSTANCE_ID.getAndIncrement();
+	}
+
+	@Override
+	public void acquire() {
+		synchronized (lock) {
+			if (held) {
+				if (LOG.isLoggable(FINE)) {
+					LOG.fine(tag + " already acquired");
+				}
+			} else {
+				if (LOG.isLoggable(FINE)) {
+					LOG.fine(tag + " acquiring shared wake lock");
+				}
+				held = true;
+				sharedWakeLock.acquire();
+			}
+		}
+	}
+
+	@Override
+	public void release() {
+		synchronized (lock) {
+			if (held) {
+				if (LOG.isLoggable(FINE)) {
+					LOG.fine(tag + " releasing shared wake lock");
+				}
+				held = false;
+				sharedWakeLock.release();
+			} else {
+				if (LOG.isLoggable(FINE)) {
+					LOG.fine(tag + " already released");
+				}
+			}
+		}
+	}
+}

bramble-android/src/main/java/org/briarproject/bramble/system/AndroidWakeLockManagerImpl.java

@@ -0,0 +1,125 @@
+package org.briarproject.bramble.system;
+
+import android.app.Application;
+import android.content.Context;
+import android.content.pm.PackageManager;
+import android.os.PowerManager;
+
+import org.briarproject.bramble.api.system.AndroidWakeLock;
+import org.briarproject.bramble.api.system.AndroidWakeLockManager;
+import org.briarproject.nullsafety.NotNullByDefault;
+
+import java.util.concurrent.Executor;
+import java.util.concurrent.ScheduledExecutorService;
+
+import javax.inject.Inject;
+
+import static android.content.Context.POWER_SERVICE;
+import static android.os.PowerManager.PARTIAL_WAKE_LOCK;
+import static java.util.concurrent.TimeUnit.MINUTES;
+import static java.util.concurrent.TimeUnit.SECONDS;
+import static org.briarproject.nullsafety.NullSafety.requireNonNull;
+
+@NotNullByDefault
+class AndroidWakeLockManagerImpl implements AndroidWakeLockManager {
+
+	/**
+	 * How often to replace the wake lock.
+	 */
+	private static final long LOCK_DURATION_MS = MINUTES.toMillis(1);
+
+	/**
+	 * Automatically release the lock this many milliseconds after it's due
+	 * to have been replaced and released.
+	 */
+	private static final long SAFETY_MARGIN_MS = SECONDS.toMillis(30);
+
+	private final SharedWakeLock sharedWakeLock;
+
+	@Inject
+	AndroidWakeLockManagerImpl(Application app,
+			ScheduledExecutorService scheduledExecutorService) {
+		PowerManager powerManager = (PowerManager)
+				requireNonNull(app.getSystemService(POWER_SERVICE));
+		String tag = getWakeLockTag(app);
+		sharedWakeLock = new RenewableWakeLock(powerManager,
+				scheduledExecutorService, PARTIAL_WAKE_LOCK, tag,
+				LOCK_DURATION_MS, SAFETY_MARGIN_MS);
+	}
+
+	@Override
+	public AndroidWakeLock createWakeLock(String tag) {
+		return new AndroidWakeLockImpl(sharedWakeLock, tag);
+	}
+
+	@Override
+	public void runWakefully(Runnable r, String tag) {
+		AndroidWakeLock wakeLock = createWakeLock(tag);
+		wakeLock.acquire();
+		try {
+			r.run();
+		} finally {
+			wakeLock.release();
+		}
+	}
+
+	@Override
+	public void executeWakefully(Runnable r, Executor executor, String tag) {
+		AndroidWakeLock wakeLock = createWakeLock(tag);
+		wakeLock.acquire();
+		try {
+			executor.execute(() -> {
+				try {
+					r.run();
+				} finally {
+					// Release the wake lock if the task throws an exception
+					wakeLock.release();
+				}
+			});
+		} catch (Exception e) {
+			// Release the wake lock if the executor throws an exception when
+			// we submit the task (in which case the release() call above won't
+			// happen)
+			wakeLock.release();
+			throw e;
+		}
+	}
+
+	@Override
+	public void executeWakefully(Runnable r, String tag) {
+		AndroidWakeLock wakeLock = createWakeLock(tag);
+		wakeLock.acquire();
+		try {
+			new Thread(() -> {
+				try {
+					r.run();
+				} finally {
+					wakeLock.release();
+				}
+			}).start();
+		} catch (Exception e) {
+			wakeLock.release();
+			throw e;
+		}
+	}
+
+	private String getWakeLockTag(Context ctx) {
+		PackageManager pm = ctx.getPackageManager();
+		if (isInstalled(pm, "com.huawei.powergenie")) {
+			return "LocationManagerService";
+		} else if (isInstalled(pm, "com.evenwell.PowerMonitor")) {
+			return "AudioIn";
+		}
+		return ctx.getPackageName();
+	}
+
+	private boolean isInstalled(PackageManager pm, String packageName) {
+		try {
+			pm.getPackageInfo(packageName, 0);
+			return true;
+		} catch (PackageManager.NameNotFoundException e) {
+			return false;
+		}
+	}
+
+}

bramble-android/src/main/java/org/briarproject/bramble/system/AndroidWakeLockModule.java

@@ -1,25 +0,0 @@
-package org.briarproject.bramble.system;
-
-import android.app.Application;
-
-import org.briarproject.android.dontkillmelib.wakelock.AndroidWakeLockManager;
-import org.briarproject.android.dontkillmelib.wakelock.AndroidWakeLockManagerFactory;
-
-import java.util.concurrent.ScheduledExecutorService;
-
-import javax.inject.Singleton;
-
-import dagger.Module;
-import dagger.Provides;
-
-@Module
-public class AndroidWakeLockModule {
-
-	@Provides
-	@Singleton
-	AndroidWakeLockManager provideWakeLockManager(Application app,
-			ScheduledExecutorService scheduledExecutorService) {
-		return AndroidWakeLockManagerFactory.createAndroidWakeLockManager(app,
-				scheduledExecutorService);
-	}
-}

bramble-android/src/main/java/org/briarproject/bramble/system/AndroidWakefulIoExecutorModule.java

@@ -1,7 +1,7 @@
 package org.briarproject.bramble.system;
 
-import org.briarproject.android.dontkillmelib.wakelock.AndroidWakeLockManager;
 import org.briarproject.bramble.api.lifecycle.IoExecutor;
+import org.briarproject.bramble.api.system.AndroidWakeLockManager;
 import org.briarproject.bramble.api.system.WakefulIoExecutor;
 
 import java.util.concurrent.Executor;

bramble-android/src/main/java/org/briarproject/bramble/system/RenewableWakeLock.java

@@ -0,0 +1,130 @@
+package org.briarproject.bramble.system;
+
+import android.os.PowerManager;
+import android.os.PowerManager.WakeLock;
+
+import org.briarproject.nullsafety.NotNullByDefault;
+
+import java.util.concurrent.Future;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.logging.Logger;
+
+import javax.annotation.Nullable;
+import javax.annotation.concurrent.GuardedBy;
+import javax.annotation.concurrent.ThreadSafe;
+
+import static java.util.concurrent.TimeUnit.MILLISECONDS;
+import static java.util.logging.Level.FINE;
+import static java.util.logging.Level.INFO;
+import static java.util.logging.Level.WARNING;
+import static java.util.logging.Logger.getLogger;
+import static org.briarproject.nullsafety.NullSafety.requireNonNull;
+
+@ThreadSafe
+@NotNullByDefault
+class RenewableWakeLock implements SharedWakeLock {
+
+	private static final Logger LOG =
+			getLogger(RenewableWakeLock.class.getName());
+
+	private final PowerManager powerManager;
+	private final ScheduledExecutorService scheduledExecutorService;
+	private final int levelAndFlags;
+	private final String tag;
+	private final long durationMs, safetyMarginMs;
+
+	private final Object lock = new Object();
+	@GuardedBy("lock")
+	@Nullable
+	private WakeLock wakeLock;
+	@GuardedBy("lock")
+	@Nullable
+	private Future<?> future;
+	@GuardedBy("lock")
+	private int refCount = 0;
+	@GuardedBy("lock")
+	private long acquired = 0;
+
+	RenewableWakeLock(PowerManager powerManager,
+			ScheduledExecutorService scheduledExecutorService,
+			int levelAndFlags,
+			String tag,
+			long durationMs,
+			long safetyMarginMs) {
+		this.powerManager = powerManager;
+		this.scheduledExecutorService = scheduledExecutorService;
+		this.levelAndFlags = levelAndFlags;
+		this.tag = tag;
+		this.durationMs = durationMs;
+		this.safetyMarginMs = safetyMarginMs;
+	}
+
+	@Override
+	public void acquire() {
+		synchronized (lock) {
+			refCount++;
+			if (refCount == 1) {
+				if (LOG.isLoggable(INFO)) {
+					LOG.info("Acquiring wake lock " + tag);
+				}
+				wakeLock = powerManager.newWakeLock(levelAndFlags, tag);
+				// We do our own reference counting so we can replace the lock
+				// TODO: Check whether using a ref-counted wake lock affects
+				//  power management apps
+				wakeLock.setReferenceCounted(false);
+				wakeLock.acquire(durationMs + safetyMarginMs);
+				future = scheduledExecutorService.schedule(this::renew,
+						durationMs, MILLISECONDS);
+				acquired = android.os.SystemClock.elapsedRealtime();
+			} else if (LOG.isLoggable(FINE)) {
+				LOG.fine("Wake lock " + tag + " has " + refCount + " holders");
+			}
+		}
+	}
+
+	private void renew() {
+		if (LOG.isLoggable(INFO)) LOG.info("Renewing wake lock " + tag);
+		synchronized (lock) {
+			if (wakeLock == null) {
+				LOG.info("Already released");
+				return;
+			}
+			if (LOG.isLoggable(FINE)) {
+				LOG.fine("Wake lock " + tag + " has " + refCount + " holders");
+			}
+			long now = android.os.SystemClock.elapsedRealtime();
+			long expiry = acquired + durationMs + safetyMarginMs;
+			if (now > expiry && LOG.isLoggable(WARNING)) {
+				LOG.warning("Wake lock expired " + (now - expiry) + " ms ago");
+			}
+			WakeLock oldWakeLock = wakeLock;
+			wakeLock = powerManager.newWakeLock(levelAndFlags, tag);
+			wakeLock.setReferenceCounted(false);
+			wakeLock.acquire(durationMs + safetyMarginMs);
+			oldWakeLock.release();
+			future = scheduledExecutorService.schedule(this::renew, durationMs,
+					MILLISECONDS);
+			acquired = now;
+		}
+	}
+
+	@Override
+	public void release() {
+		synchronized (lock) {
+			refCount--;
+			if (refCount == 0) {
+				if (LOG.isLoggable(INFO)) {
+					LOG.info("Releasing wake lock " + tag);
+				}
+				requireNonNull(future).cancel(false);
+				future = null;
+				requireNonNull(wakeLock).release();
+				wakeLock = null;
+				acquired = 0;
+			} else if (LOG.isLoggable(FINE)) {
+				LOG.fine("Wake lock " + tag + " has " + refCount + " holders");
+			}
+		}
+	}
+}
+

bramble-android/src/main/java/org/briarproject/bramble/system/SharedWakeLock.java

@@ -0,0 +1,22 @@
+package org.briarproject.bramble.system;
+
+import org.briarproject.bramble.api.system.AndroidWakeLock;
+import org.briarproject.nullsafety.NotNullByDefault;
+
+@NotNullByDefault
+interface SharedWakeLock {
+
+	/**
+	 * Acquires the wake lock. This increments the wake lock's reference count,
+	 * so unlike {@link AndroidWakeLock#acquire()} every call to this method
+	 * must be followed by a balancing call to {@link #release()}.
+	 */
+	void acquire();
+
+	/**
+	 * Releases the wake lock. This decrements the wake lock's reference count,
+	 * so unlike {@link AndroidWakeLock#release()} every call to this method
+	 * must follow a balancing call to {@link #acquire()}.
+	 */
+	void release();
+}

bramble-android/src/main/java/org/briarproject/bramble/util/AndroidUtils.java

@@ -11,20 +11,20 @@ import org.briarproject.bramble.api.Pair;
 import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.io.File;
+import java.io.IOException;
 import java.lang.reflect.Field;
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
+import java.util.ArrayList;
 import java.util.Collection;
+import java.util.List;
+import java.util.Scanner;
 
 import javax.annotation.Nullable;
 
-import static android.Manifest.permission.BLUETOOTH_CONNECT;
-import static android.app.PendingIntent.FLAG_IMMUTABLE;
 import static android.content.Context.MODE_PRIVATE;
-import static android.content.pm.PackageManager.PERMISSION_GRANTED;
 import static android.os.Build.VERSION.SDK_INT;
-import static android.os.Process.myPid;
-import static android.os.Process.myUid;
+import static java.lang.Runtime.getRuntime;
 import static java.util.Arrays.asList;
 import static org.briarproject.nullsafety.NullSafety.requireNonNull;
 
@@ -38,12 +38,14 @@ public class AndroidUtils {
 	private static final String STORED_LOGCAT = "dev-logcat";
 
 	public static Collection<String> getSupportedArchitectures() {
-		return asList(Build.SUPPORTED_ABIS);
-	}
-
-	public static boolean hasBtConnectPermission(Context ctx) {
-		return SDK_INT < 31 || ctx.checkPermission(BLUETOOTH_CONNECT, myPid(),
-				myUid()) == PERMISSION_GRANTED;
+		List<String> abis = new ArrayList<>();
+		if (SDK_INT >= 21) {
+			abis.addAll(asList(Build.SUPPORTED_ABIS));
+		} else {
+			abis.add(Build.CPU_ABI);
+			if (Build.CPU_ABI2 != null) abis.add(Build.CPU_ABI2);
+		}
+		return abis;
 	}
 
 	public static String getBluetoothAddress(Context ctx,
@@ -53,9 +55,6 @@ public class AndroidUtils {
 
 	public static Pair<String, String> getBluetoothAddressAndMethod(Context ctx,
 			BluetoothAdapter adapter) {
-		// If we don't have permission to access the adapter's address, let
-		// the caller know we can't find it
-		if (!hasBtConnectPermission(ctx)) return new Pair<>("", "");
 		// Return the adapter's address if it's valid and not fake
 		@SuppressLint("HardwareIds")
 		String address = adapter.getAddress();
@@ -63,17 +62,10 @@ public class AndroidUtils {
 			return new Pair<>(address, "adapter");
 		}
 		// Return the address from settings if it's valid and not fake
-		if (SDK_INT < 33) {
-			try {
-				address = Settings.Secure.getString(ctx.getContentResolver(),
-						"bluetooth_address");
-				if (isValidBluetoothAddress(address)) {
-					return new Pair<>(address, "settings");
-				}
-			} catch (SecurityException e) {
-				// Some custom ROMs throw this exception on SDK_INT < 33.
-				// Fall through
-			}
+		address = Settings.Secure.getString(ctx.getContentResolver(),
+				"bluetooth_address");
+		if (isValidBluetoothAddress(address)) {
+			return new Pair<>(address, "settings");
 		}
 		// Try to get the address via reflection
 		address = getBluetoothAddressByReflection(adapter);
@@ -131,14 +123,20 @@ public class AndroidUtils {
 		return new String[] {"image/jpeg", "image/png", "image/gif"};
 	}
 
+	@Nullable
+	public static String getSystemProperty(String propName) {
+		try {
+			Process p = getRuntime().exec("getprop " + propName);
+			Scanner s = new Scanner(p.getInputStream());
+			String line = s.nextLine();
+			s.close();
+			return line;
+		} catch (SecurityException | IOException e) {
+			return null;
+		}
+	}
+
 	public static boolean isUiThread() {
 		return Looper.myLooper() == Looper.getMainLooper();
 	}
-
-	public static int getImmutableFlags(int flags) {
-		if (SDK_INT >= 23) {
-			return FLAG_IMMUTABLE | flags;
-		}
-		return flags;
-	}
 }

bramble-android/src/test/java/org/briarproject/bramble/account/AndroidAccountManagerTest.java

@@ -87,10 +87,6 @@ public class AndroidAccountManagerTest extends BrambleMockTestCase {
 		File potatoFile = new File(potatoDir, "file");
 		File filesDir = new File(testDir, "filesDir");
 		File externalCacheDir = new File(testDir, "externalCacheDir");
-		File externalCacheDir1 = new File(testDir, "externalCacheDir1");
-		File externalCacheDir2 = new File(testDir, "externalCacheDir2");
-		File externalMediaDir1 = new File(testDir, "externalMediaDir1");
-		File externalMediaDir2 = new File(testDir, "externalMediaDir2");
 
 		context.checking(new Expectations() {{
 			oneOf(prefs).edit();
@@ -113,12 +109,6 @@ public class AndroidAccountManagerTest extends BrambleMockTestCase {
 			will(returnValue(cacheDir));
 			oneOf(app).getExternalCacheDir();
 			will(returnValue(externalCacheDir));
-			oneOf(app).getExternalCacheDirs();
-			will(returnValue(
-					new File[] {externalCacheDir1, externalCacheDir2}));
-			oneOf(app).getExternalMediaDirs();
-			will(returnValue(
-					new File[] {externalMediaDir1, externalMediaDir2}));
 		}});
 
 		assertTrue(dbDir.mkdirs());
@@ -135,10 +125,6 @@ public class AndroidAccountManagerTest extends BrambleMockTestCase {
 		assertTrue(potatoFile.createNewFile());
 		assertTrue(filesDir.mkdirs());
 		assertTrue(externalCacheDir.mkdirs());
-		assertTrue(externalCacheDir1.mkdirs());
-		assertTrue(externalCacheDir2.mkdirs());
-		assertTrue(externalMediaDir1.mkdirs());
-		assertTrue(externalMediaDir2.mkdirs());
 
 		accountManager.deleteAccount();
 
@@ -156,10 +142,6 @@ public class AndroidAccountManagerTest extends BrambleMockTestCase {
 		assertFalse(potatoFile.exists());
 		assertFalse(filesDir.exists());
 		assertFalse(externalCacheDir.exists());
-		assertFalse(externalCacheDir1.exists());
-		assertFalse(externalCacheDir2.exists());
-		assertFalse(externalMediaDir1.exists());
-		assertFalse(externalMediaDir2.exists());
 	}
 
 	@After

bramble-android/witness.gradle

@@ -1,67 +1,165 @@
 dependencyVerification {
     verify = [
-            'androidx.annotation:annotation:1.5.0:annotation-1.5.0.jar:261fb7c0210858500bab66d34354972a75166ab4182add283780b05513d6ec4a',
-            'cglib:cglib:3.2.8:cglib-3.2.8.jar:3f64de999ecc5595dc84ca8ff0879d8a34c8623f9ef3c517a53ed59023fcb9db',
-            'com.google.code.findbugs:annotations:3.0.1:annotations-3.0.1.jar:6b47ff0a6de0ce17cbedc3abb0828ca5bce3009d53ea47b3723ff023c4742f79',
-            'com.google.code.findbugs:jsr305:3.0.2:jsr305-3.0.2.jar:766ad2a0783f2687962c8ad74ceecc38a28b9f72a2d085ee438b7813e928d0c7',
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+        'org.ow2.asm:asm-analysis:7.0:asm-analysis-7.0.jar:e981f8f650c4d900bb033650b18e122fa6b161eadd5f88978d08751f72ee8474',
+        'org.ow2.asm:asm-commons:7.0:asm-commons-7.0.jar:fed348ef05958e3e846a3ac074a12af5f7936ef3d21ce44a62c4fa08a771927d',
+        'org.ow2.asm:asm-tree:7.0:asm-tree-7.0.jar:cfd7a0874f9de36a999c127feeadfbfe6e04d4a71ee954d7af3d853f0be48a6c',
+        'org.ow2.asm:asm-util:7.0:asm-util-7.0.jar:75fbbca440ef463f41c2b0ab1a80abe67e910ac486da60a7863cbcb5bae7e145',
+        'org.ow2.asm:asm:7.0:asm-7.0.jar:b88ef66468b3c978ad0c97fd6e90979e56155b4ac69089ba7a44e9aa7ffe9acf',
+        'org.ow2.asm:asm:7.1:asm-7.1.jar:4ab2fa2b6d2cc9ccb1eaa05ea329c407b47b13ed2915f62f8c4b8cc96258d4de',
+        'org.testng:testng:7.3.0:testng-7.3.0.jar:63727488f9717d57f0d0a0fee5a1fc10a2be9cfcff2ec3a7187656d663c0774e',
+        'xerces:xercesImpl:2.12.0:xercesImpl-2.12.0.jar:b50d3a4ca502faa4d1c838acb8aa9480446953421f7327e338c5dda3da5e76d0',
+        'xml-apis:xml-apis:1.4.01:xml-apis-1.4.01.jar:a840968176645684bb01aed376e067ab39614885f9eee44abe35a5f20ebe7fad',
     ]
 }

bramble-api/build.gradle

@@ -8,10 +8,9 @@ apply from: 'witness.gradle'
 
 dependencies {
 	api 'org.briarproject:null-safety:0.1'
-	api 'com.google.code.findbugs:jsr305:3.0.2'
-	api 'javax.inject:javax.inject:1'
-	api "com.google.dagger:dagger:$dagger_version"
 
+	implementation "com.google.dagger:dagger:$dagger_version"
+	implementation 'com.google.code.findbugs:jsr305:3.0.2'
 	implementation "com.fasterxml.jackson.core:jackson-annotations:$jackson_version"
 
 	testImplementation "junit:junit:$junit_version"
@@ -26,7 +25,7 @@ configurations {
 	testOutput.extendsFrom(testCompile)
 }
 task jarTest(type: Jar, dependsOn: testClasses) {
-	from sourceSets.test.output, sourceSets.main.output
+	from sourceSets.test.output
 	classifier = 'test'
 }
 artifacts {

bramble-api/src/main/java/org/briarproject/bramble/api/FeatureFlags.java

@@ -11,6 +11,8 @@ public interface FeatureFlags {
 
 	boolean shouldEnableDisappearingMessages();
 
+	boolean shouldEnableMailbox();
+
 	boolean shouldEnablePrivateGroupsInCore();
 
 	boolean shouldEnableForumsInCore();

bramble-api/src/main/java/org/briarproject/bramble/api/client/BdfMessageValidator.java

@@ -16,7 +16,6 @@ import java.util.logging.Logger;
 
 import javax.annotation.concurrent.Immutable;
 
-import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.api.transport.TransportConstants.MAX_CLOCK_DIFFERENCE;
 
 @Immutable
@@ -24,30 +23,17 @@ import static org.briarproject.bramble.api.transport.TransportConstants.MAX_CLOC
 public abstract class BdfMessageValidator implements MessageValidator {
 
 	protected static final Logger LOG =
-			getLogger(BdfMessageValidator.class.getName());
+			Logger.getLogger(BdfMessageValidator.class.getName());
 
 	protected final ClientHelper clientHelper;
 	protected final MetadataEncoder metadataEncoder;
 	protected final Clock clock;
-	protected final boolean canonical;
-
-	/**
-	 * Transitional alternative to
-	 * {@link #BdfMessageValidator(ClientHelper, MetadataEncoder, Clock)} that
-	 * accepts messages in non-canonical form, for backward compatibility.
-	 */
-	@Deprecated
-	protected BdfMessageValidator(ClientHelper clientHelper,
-			MetadataEncoder metadataEncoder, Clock clock, boolean canonical) {
-		this.clientHelper = clientHelper;
-		this.metadataEncoder = metadataEncoder;
-		this.clock = clock;
-		this.canonical = canonical;
-	}
 
 	protected BdfMessageValidator(ClientHelper clientHelper,
 			MetadataEncoder metadataEncoder, Clock clock) {
-		this(clientHelper, metadataEncoder, clock, true);
+		this.clientHelper = clientHelper;
+		this.metadataEncoder = metadataEncoder;
+		this.clock = clock;
 	}
 
 	protected abstract BdfMessageContext validateMessage(Message m, Group g,
@@ -63,7 +49,7 @@ public abstract class BdfMessageValidator implements MessageValidator {
 					"Timestamp is too far in the future");
 		}
 		try {
-			BdfList bodyList = clientHelper.toList(m, canonical);
+			BdfList bodyList = clientHelper.toList(m.getBody());
 			BdfMessageContext result = validateMessage(m, g, bodyList);
 			Metadata meta = metadataEncoder.encode(result.getDictionary());
 			return new MessageContext(meta, result.getDependencies());

bramble-api/src/main/java/org/briarproject/bramble/api/client/ClientHelper.java

@@ -49,18 +49,6 @@ public interface ClientHelper {
 	BdfList getMessageAsList(Transaction txn, MessageId m) throws DbException,
 			FormatException;
 
-	/**
-	 * Transitional alternative to
-	 * {@link #getMessageAsList(Transaction, MessageId)} that allows the
-	 * message to be in non-canonical form, for backward compatibility.
-	 *
-	 * @param canonical True if the message must be in canonical form (a
-	 * {@link FormatException} will be thrown if it's not.
-	 */
-	@Deprecated
-	BdfList getMessageAsList(Transaction txn, MessageId m, boolean canonical)
-			throws DbException, FormatException;
-
 	BdfDictionary getGroupMetadataAsDictionary(GroupId g) throws DbException,
 			FormatException;
 
@@ -118,16 +106,6 @@ public interface ClientHelper {
 
 	BdfList toList(Message m) throws FormatException;
 
-	/**
-	 * Transitional alternative to {@link #toList(Message)} that allows the
-	 * message to be in non-canonical form, for backward compatibility.
-	 *
-	 * @param canonical True if the message must be in canonical form (a
-	 * {@link FormatException} will be thrown if it's not.
-	 */
-	@Deprecated
-	BdfList toList(Message m, boolean canonical) throws FormatException;
-
 	BdfList toList(Author a);
 
 	byte[] sign(String label, BdfList toSign, PrivateKey privateKey)

bramble-api/src/main/java/org/briarproject/bramble/api/crypto/CryptoComponent.java

@@ -54,38 +54,6 @@ public interface CryptoComponent {
 			KeyPair ourKeyPair, byte[]... inputs)
 			throws GeneralSecurityException;
 
-	/**
-	 * Derives a shared secret from two static and two ephemeral key pairs.
-	 * <p>
-	 * Do not use this method for new protocols. The shared secret can be
-	 * re-derived using the ephemeral public keys and both static private
-	 * keys, so keys derived from the shared secret should not be used if
-	 * forward secrecy is required. Use {@link #deriveSharedSecret(String,
-	 * PublicKey, PublicKey, KeyPair, KeyPair, boolean, byte[]...)} instead.
-	 * <p>
-	 * TODO: Remove this after a reasonable migration period (added 2023-03-10).
-	 * <p>
-	 *
-	 * @param label A namespaced label indicating the purpose of this shared
-	 * secret, to prevent it from being repurposed or colliding with a shared
-	 * secret derived for another purpose
-	 * @param theirStaticPublicKey The static public key of the remote party
-	 * @param theirEphemeralPublicKey The ephemeral public key of the remote
-	 * party
-	 * @param ourStaticKeyPair The static key pair of the local party
-	 * @param ourEphemeralKeyPair The ephemeral key pair of the local party
-	 * @param alice True if the local party is Alice
-	 * @param inputs Additional inputs that will be included in the
-	 * derivation of the shared secret
-	 * @return The shared secret
-	 */
-	@Deprecated
-	SecretKey deriveSharedSecretBadly(String label,
-			PublicKey theirStaticPublicKey, PublicKey theirEphemeralPublicKey,
-			KeyPair ourStaticKeyPair, KeyPair ourEphemeralKeyPair,
-			boolean alice, byte[]... inputs)
-			throws GeneralSecurityException;
-
 	/**
 	 * Derives a shared secret from two static and two ephemeral key pairs.
 	 *

bramble-api/src/main/java/org/briarproject/bramble/api/data/BdfDictionary.java

@@ -10,29 +10,8 @@ import java.util.TreeMap;
 import javax.annotation.Nullable;
 import javax.annotation.concurrent.NotThreadSafe;
 
-/**
- * A BDF dictionary contains zero or more key-value pairs, where the keys
- * are strings and the values are BDF objects, which may be primitive types
- * (null, boolean, integer, float, string, raw) or nested containers (list,
- * dictionary).
- * <p>
- * Note that a BDF integer has the same range as a Java long, while a BDF
- * float has the same range as a Java double. Method names in this class
- * correspond to the Java types.
- * <p>
- * The getX() methods throw {@link FormatException} if the specified key is
- * absent, the value is null, or the value does not have the requested type.
- * <p>
- * The getOptionalX() methods return null if the specified key is absent or
- * the value is null, or throw {@link FormatException} if the value does not
- * have the requested type.
- * <p>
- * The getX() methods that take a default value return the default value if
- * the specified key is absent or the value is null, or throw
- * {@link FormatException} if the value does not have the requested type.
- */
 @NotThreadSafe
-public final class BdfDictionary extends TreeMap<String, Object> {
+public class BdfDictionary extends TreeMap<String, Object> {
 
 	public static final Object NULL_VALUE = new Object();
 
@@ -60,9 +39,9 @@ public final class BdfDictionary extends TreeMap<String, Object> {
 	}
 
 	public Boolean getBoolean(String key) throws FormatException {
-		Boolean value = getOptionalBoolean(key);
-		if (value == null) throw new FormatException();
-		return value;
+		Object o = get(key);
+		if (o instanceof Boolean) return (Boolean) o;
+		throw new FormatException();
 	}
 
 	@Nullable
@@ -73,16 +52,19 @@ public final class BdfDictionary extends TreeMap<String, Object> {
 		throw new FormatException();
 	}
 
-	public Boolean getBoolean(String key, Boolean defaultValue)
-			throws FormatException {
-		Boolean value = getOptionalBoolean(key);
-		return value == null ? defaultValue : value;
+	public Boolean getBoolean(String key, Boolean defaultValue) {
+		Object o = get(key);
+		if (o instanceof Boolean) return (Boolean) o;
+		return defaultValue;
 	}
 
 	public Long getLong(String key) throws FormatException {
-		Long value = getOptionalLong(key);
-		if (value == null) throw new FormatException();
-		return value;
+		Object o = get(key);
+		if (o instanceof Long) return (Long) o;
+		if (o instanceof Integer) return ((Integer) o).longValue();
+		if (o instanceof Short) return ((Short) o).longValue();
+		if (o instanceof Byte) return ((Byte) o).longValue();
+		throw new FormatException();
 	}
 
 	@Nullable
@@ -96,69 +78,20 @@ public final class BdfDictionary extends TreeMap<String, Object> {
 		throw new FormatException();
 	}
 
-	public Long getLong(String key, Long defaultValue) throws FormatException {
-		Long value = getOptionalLong(key);
-		return value == null ? defaultValue : value;
-	}
-
-	/**
-	 * Returns the integer with the specified key.
-	 * <p>
-	 * This method should be used in preference to
-	 * <code>getLong(key).intValue()</code> as it checks for
-	 * overflow/underflow.
-	 *
-	 * @throws FormatException if there is no value at the specified key,
-	 * or if the value is null or cannot be represented as a Java int.
-	 */
-	public Integer getInt(String key) throws FormatException {
-		Integer value = getOptionalInt(key);
-		if (value == null) throw new FormatException();
-		return value;
-	}
-
-	/**
-	 * Returns the integer with the specified key, or null if the key is
-	 * absent or the value is null.
-	 * <p>
-	 * This method should be used in preference to
-	 * <code>getOptionalLong(key).intValue()</code> as it checks for
-	 * overflow/underflow.
-	 *
-	 * @throws FormatException if the value at the specified key is not null
-	 * and cannot be represented as a Java int.
-	 */
-	@Nullable
-	public Integer getOptionalInt(String key) throws FormatException {
-		Long value = getOptionalLong(key);
-		if (value == null) return null;
-		if (value < Integer.MIN_VALUE || value > Integer.MAX_VALUE) {
-			throw new FormatException();
-		}
-		return value.intValue();
-	}
-
-	/**
-	 * Returns the integer with the specified key, or the given default
-	 * value if the key is absent or the value is null.
-	 * <p>
-	 * This method should be used in preference to
-	 * <code>getLong(key, defaultValue).intValue()</code> as it checks for
-	 * overflow/underflow.
-	 *
-	 * @throws FormatException if the value at the specified key is not null
-	 * and cannot be represented as a Java int.
-	 */
-	public Integer getInt(String key, Integer defaultValue)
-			throws FormatException {
-		Integer value = getOptionalInt(key);
-		return value == null ? defaultValue : value;
+	public Long getLong(String key, Long defaultValue) {
+		Object o = get(key);
+		if (o instanceof Long) return (Long) o;
+		if (o instanceof Integer) return ((Integer) o).longValue();
+		if (o instanceof Short) return ((Short) o).longValue();
+		if (o instanceof Byte) return ((Byte) o).longValue();
+		return defaultValue;
 	}
 
 	public Double getDouble(String key) throws FormatException {
-		Double value = getOptionalDouble(key);
-		if (value == null) throw new FormatException();
-		return value;
+		Object o = get(key);
+		if (o instanceof Double) return (Double) o;
+		if (o instanceof Float) return ((Float) o).doubleValue();
+		throw new FormatException();
 	}
 
 	@Nullable
@@ -170,16 +103,17 @@ public final class BdfDictionary extends TreeMap<String, Object> {
 		throw new FormatException();
 	}
 
-	public Double getDouble(String key, Double defaultValue)
-			throws FormatException {
-		Double value = getOptionalDouble(key);
-		return value == null ? defaultValue : value;
+	public Double getDouble(String key, Double defaultValue) {
+		Object o = get(key);
+		if (o instanceof Double) return (Double) o;
+		if (o instanceof Float) return ((Float) o).doubleValue();
+		return defaultValue;
 	}
 
 	public String getString(String key) throws FormatException {
-		String value = getOptionalString(key);
-		if (value == null) throw new FormatException();
-		return value;
+		Object o = get(key);
+		if (o instanceof String) return (String) o;
+		throw new FormatException();
 	}
 
 	@Nullable
@@ -190,16 +124,17 @@ public final class BdfDictionary extends TreeMap<String, Object> {
 		throw new FormatException();
 	}
 
-	public String getString(String key, String defaultValue)
-			throws FormatException {
-		String value = getOptionalString(key);
-		return value == null ? defaultValue : value;
+	public String getString(String key, String defaultValue) {
+		Object o = get(key);
+		if (o instanceof String) return (String) o;
+		return defaultValue;
 	}
 
 	public byte[] getRaw(String key) throws FormatException {
-		byte[] value = getOptionalRaw(key);
-		if (value == null) throw new FormatException();
-		return value;
+		Object o = get(key);
+		if (o instanceof byte[]) return (byte[]) o;
+		if (o instanceof Bytes) return ((Bytes) o).getBytes();
+		throw new FormatException();
 	}
 
 	@Nullable
@@ -211,16 +146,17 @@ public final class BdfDictionary extends TreeMap<String, Object> {
 		throw new FormatException();
 	}
 
-	public byte[] getRaw(String key, byte[] defaultValue)
-			throws FormatException {
-		byte[] value = getOptionalRaw(key);
-		return value == null ? defaultValue : value;
+	public byte[] getRaw(String key, byte[] defaultValue) {
+		Object o = get(key);
+		if (o instanceof byte[]) return (byte[]) o;
+		if (o instanceof Bytes) return ((Bytes) o).getBytes();
+		return defaultValue;
 	}
 
 	public BdfList getList(String key) throws FormatException {
-		BdfList value = getOptionalList(key);
-		if (value == null) throw new FormatException();
-		return value;
+		Object o = get(key);
+		if (o instanceof BdfList) return (BdfList) o;
+		throw new FormatException();
 	}
 
 	@Nullable
@@ -231,16 +167,16 @@ public final class BdfDictionary extends TreeMap<String, Object> {
 		throw new FormatException();
 	}
 
-	public BdfList getList(String key, BdfList defaultValue)
-			throws FormatException {
-		BdfList value = getOptionalList(key);
-		return value == null ? defaultValue : value;
+	public BdfList getList(String key, BdfList defaultValue) {
+		Object o = get(key);
+		if (o instanceof BdfList) return (BdfList) o;
+		return defaultValue;
 	}
 
 	public BdfDictionary getDictionary(String key) throws FormatException {
-		BdfDictionary value = getOptionalDictionary(key);
-		if (value == null) throw new FormatException();
-		return value;
+		Object o = get(key);
+		if (o instanceof BdfDictionary) return (BdfDictionary) o;
+		throw new FormatException();
 	}
 
 	@Nullable
@@ -252,9 +188,9 @@ public final class BdfDictionary extends TreeMap<String, Object> {
 		throw new FormatException();
 	}
 
-	public BdfDictionary getDictionary(String key, BdfDictionary defaultValue)
-			throws FormatException {
-		BdfDictionary value = getOptionalDictionary(key);
-		return value == null ? defaultValue : value;
+	public BdfDictionary getDictionary(String key, BdfDictionary defaultValue) {
+		Object o = get(key);
+		if (o instanceof BdfDictionary) return (BdfDictionary) o;
+		return defaultValue;
 	}
 }

bramble-api/src/main/java/org/briarproject/bramble/api/data/BdfEntry.java

@@ -6,11 +6,6 @@ import java.util.Map.Entry;
 
 import javax.annotation.concurrent.Immutable;
 
-/**
- * A convenience class for building {@link BdfDictionary BdfDictionaries}
- * via the {@link BdfDictionary#of(Entry[]) factory method}. Entries in
- * BdfDictionaries do not have to be BdfEntries.
- */
 @Immutable
 @NotNullByDefault
 public class BdfEntry implements Entry<String, Object>, Comparable<BdfEntry> {

bramble-api/src/main/java/org/briarproject/bramble/api/data/BdfList.java

@@ -12,31 +12,8 @@ import javax.annotation.concurrent.NotThreadSafe;
 
 import static org.briarproject.bramble.api.data.BdfDictionary.NULL_VALUE;
 
-/**
- * A BDF list contains zero or more BDF objects, which may be primitive types
- * (null, boolean, integer, float, string, raw) or nested containers (list,
- * dictionary).
- * <p>
- * Note that a BDF integer has the same range as a Java long, while a BDF
- * float has the same range as a Java double. Method names in this class
- * correspond to the Java types.
- * <p>
- * The getX() methods throw {@link FormatException} if the object at the
- * specified index is null or does not have the requested type.
- * <p>
- * The getOptionalX() methods return null if the object at the specified
- * index is null, or throw {@link FormatException} if the object does not
- * have the requested type.
- * <p>
- * The getX() methods that take a default value return the default value if
- * the object at the specified index is null, or throw
- * {@link FormatException} if the object does not have the requested type.
- * <p>
- * All of the getters throw {@link FormatException} if the specified index is
- * out of range.
- */
 @NotThreadSafe
-public final class BdfList extends ArrayList<Object> {
+public class BdfList extends ArrayList<Object> {
 
 	/**
 	 * Factory method for constructing lists inline.
@@ -56,15 +33,15 @@ public final class BdfList extends ArrayList<Object> {
 		super(items);
 	}
 
-	@SuppressWarnings("BooleanMethodIsAlwaysInverted")
 	private boolean isInRange(int index) {
 		return index >= 0 && index < size();
 	}
 
 	public Boolean getBoolean(int index) throws FormatException {
-		Boolean value = getOptionalBoolean(index);
-		if (value == null) throw new FormatException();
-		return value;
+		if (!isInRange(index)) throw new FormatException();
+		Object o = get(index);
+		if (o instanceof Boolean) return (Boolean) o;
+		throw new FormatException();
 	}
 
 	@Nullable
@@ -76,16 +53,21 @@ public final class BdfList extends ArrayList<Object> {
 		throw new FormatException();
 	}
 
-	public Boolean getBoolean(int index, Boolean defaultValue)
-			throws FormatException {
-		Boolean value = getOptionalBoolean(index);
-		return value == null ? defaultValue : value;
+	public Boolean getBoolean(int index, Boolean defaultValue) {
+		if (!isInRange(index)) return defaultValue;
+		Object o = get(index);
+		if (o instanceof Boolean) return (Boolean) o;
+		return defaultValue;
 	}
 
 	public Long getLong(int index) throws FormatException {
-		Long value = getOptionalLong(index);
-		if (value == null) throw new FormatException();
-		return value;
+		if (!isInRange(index)) throw new FormatException();
+		Object o = get(index);
+		if (o instanceof Long) return (Long) o;
+		if (o instanceof Integer) return ((Integer) o).longValue();
+		if (o instanceof Short) return ((Short) o).longValue();
+		if (o instanceof Byte) return ((Byte) o).longValue();
+		throw new FormatException();
 	}
 
 	@Nullable
@@ -100,70 +82,22 @@ public final class BdfList extends ArrayList<Object> {
 		throw new FormatException();
 	}
 
-	public Long getLong(int index, Long defaultValue) throws FormatException {
-		Long value = getOptionalLong(index);
-		return value == null ? defaultValue : value;
-	}
-
-	/**
-	 * Returns the integer at the specified index.
-	 * <p>
-	 * This method should be used in preference to
-	 * <code>getLong(index).intValue()</code> as it checks for
-	 * overflow/underflow.
-	 *
-	 * @throws FormatException if the index is out of range, or if the
-	 * value at the specified index is null or cannot be represented as a
-	 * Java int.
-	 */
-	public Integer getInt(int index) throws FormatException {
-		Integer value = getOptionalInt(index);
-		if (value == null) throw new FormatException();
-		return value;
-	}
-
-	/**
-	 * Returns the integer at the specified index, or null if the object at
-	 * the specified index is null.
-	 * <p>
-	 * This method should be used in preference to
-	 * <code>getOptionalLong(index).intValue()</code> as it checks for
-	 * overflow/underflow.
-	 *
-	 * @throws FormatException if the index is out of range, or if the value
-	 * at the specified index cannot be represented as a Java int.
-	 */
-	@Nullable
-	public Integer getOptionalInt(int index) throws FormatException {
-		Long value = getOptionalLong(index);
-		if (value == null) return null;
-		if (value < Integer.MIN_VALUE || value > Integer.MAX_VALUE) {
-			throw new FormatException();
-		}
-		return value.intValue();
-	}
-
-	/**
-	 * Returns the integer at the specified index, or the given default value
-	 * if the object at the specified index is null.
-	 * <p>
-	 * This method should be used in preference to
-	 * <code>getLong(index, defaultValue).intValue()</code> as it checks for
-	 * overflow/underflow.
-	 *
-	 * @throws FormatException if the index is out of range, or if the value
-	 * at the specified index cannot be represented as a Java int.
-	 */
-	public Integer getInt(int index, Integer defaultValue)
-			throws FormatException {
-		Integer value = getOptionalInt(index);
-		return value == null ? defaultValue : value;
+	public Long getLong(int index, Long defaultValue) {
+		if (!isInRange(index)) return defaultValue;
+		Object o = get(index);
+		if (o instanceof Long) return (Long) o;
+		if (o instanceof Integer) return ((Integer) o).longValue();
+		if (o instanceof Short) return ((Short) o).longValue();
+		if (o instanceof Byte) return ((Byte) o).longValue();
+		return defaultValue;
 	}
 
 	public Double getDouble(int index) throws FormatException {
-		Double value = getOptionalDouble(index);
-		if (value == null) throw new FormatException();
-		return value;
+		if (!isInRange(index)) throw new FormatException();
+		Object o = get(index);
+		if (o instanceof Double) return (Double) o;
+		if (o instanceof Float) return ((Float) o).doubleValue();
+		throw new FormatException();
 	}
 
 	@Nullable
@@ -176,16 +110,19 @@ public final class BdfList extends ArrayList<Object> {
 		throw new FormatException();
 	}
 
-	public Double getDouble(int index, Double defaultValue)
-			throws FormatException {
-		Double value = getOptionalDouble(index);
-		return value == null ? defaultValue : value;
+	public Double getDouble(int index, Double defaultValue) {
+		if (!isInRange(index)) return defaultValue;
+		Object o = get(index);
+		if (o instanceof Double) return (Double) o;
+		if (o instanceof Float) return ((Float) o).doubleValue();
+		return defaultValue;
 	}
 
 	public String getString(int index) throws FormatException {
-		String value = getOptionalString(index);
-		if (value == null) throw new FormatException();
-		return value;
+		if (!isInRange(index)) throw new FormatException();
+		Object o = get(index);
+		if (o instanceof String) return (String) o;
+		throw new FormatException();
 	}
 
 	@Nullable
@@ -197,16 +134,19 @@ public final class BdfList extends ArrayList<Object> {
 		throw new FormatException();
 	}
 
-	public String getString(int index, String defaultValue)
-			throws FormatException {
-		String value = getOptionalString(index);
-		return value == null ? defaultValue : value;
+	public String getString(int index, String defaultValue) {
+		if (!isInRange(index)) return defaultValue;
+		Object o = get(index);
+		if (o instanceof String) return (String) o;
+		return defaultValue;
 	}
 
 	public byte[] getRaw(int index) throws FormatException {
-		byte[] value = getOptionalRaw(index);
-		if (value == null) throw new FormatException();
-		return value;
+		if (!isInRange(index)) throw new FormatException();
+		Object o = get(index);
+		if (o instanceof byte[]) return (byte[]) o;
+		if (o instanceof Bytes) return ((Bytes) o).getBytes();
+		throw new FormatException();
 	}
 
 	@Nullable
@@ -219,16 +159,19 @@ public final class BdfList extends ArrayList<Object> {
 		throw new FormatException();
 	}
 
-	public byte[] getRaw(int index, byte[] defaultValue)
-			throws FormatException {
-		byte[] value = getOptionalRaw(index);
-		return value == null ? defaultValue : value;
+	public byte[] getRaw(int index, byte[] defaultValue) {
+		if (!isInRange(index)) return defaultValue;
+		Object o = get(index);
+		if (o instanceof byte[]) return (byte[]) o;
+		if (o instanceof Bytes) return ((Bytes) o).getBytes();
+		return defaultValue;
 	}
 
 	public BdfList getList(int index) throws FormatException {
-		BdfList value = getOptionalList(index);
-		if (value == null) throw new FormatException();
-		return value;
+		if (!isInRange(index)) throw new FormatException();
+		Object o = get(index);
+		if (o instanceof BdfList) return (BdfList) o;
+		throw new FormatException();
 	}
 
 	@Nullable
@@ -240,16 +183,18 @@ public final class BdfList extends ArrayList<Object> {
 		throw new FormatException();
 	}
 
-	public BdfList getList(int index, BdfList defaultValue)
-			throws FormatException {
-		BdfList value = getOptionalList(index);
-		return value == null ? defaultValue : value;
+	public BdfList getList(int index, BdfList defaultValue) {
+		if (!isInRange(index)) return defaultValue;
+		Object o = get(index);
+		if (o instanceof BdfList) return (BdfList) o;
+		return defaultValue;
 	}
 
 	public BdfDictionary getDictionary(int index) throws FormatException {
-		BdfDictionary value = getOptionalDictionary(index);
-		if (value == null) throw new FormatException();
-		return value;
+		if (!isInRange(index)) throw new FormatException();
+		Object o = get(index);
+		if (o instanceof BdfDictionary) return (BdfDictionary) o;
+		throw new FormatException();
 	}
 
 	@Nullable
@@ -262,9 +207,10 @@ public final class BdfList extends ArrayList<Object> {
 		throw new FormatException();
 	}
 
-	public BdfDictionary getDictionary(int index, BdfDictionary defaultValue)
-			throws FormatException {
-		BdfDictionary value = getOptionalDictionary(index);
-		return value == null ? defaultValue : value;
+	public BdfDictionary getDictionary(int index, BdfDictionary defaultValue) {
+		if (!isInRange(index)) return defaultValue;
+		Object o = get(index);
+		if (o instanceof BdfDictionary) return (BdfDictionary) o;
+		return defaultValue;
 	}
 }

bramble-api/src/main/java/org/briarproject/bramble/api/data/BdfReader.java

@@ -1,178 +1,76 @@
 package org.briarproject.bramble.api.data;
 
-import org.briarproject.bramble.api.FormatException;
 import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.io.IOException;
 
-/**
- * An interface for reading BDF objects from an input stream.
- * <p>
- * The readX() methods throw {@link FormatException} if the data is not in
- * canonical form, but the hasX() and skipX() methods do not check for
- * canonical form.
- */
 @NotNullByDefault
 public interface BdfReader {
 
 	int DEFAULT_NESTED_LIMIT = 5;
 	int DEFAULT_MAX_BUFFER_SIZE = 64 * 1024;
 
-	/**
-	 * Returns true if the reader has reached the end of its input stream.
-	 */
 	boolean eof() throws IOException;
 
-	/**
-	 * Closes the reader's input stream.
-	 */
 	void close() throws IOException;
 
-	/**
-	 * Returns true if the next object in the input is a BDF null.
-	 */
 	boolean hasNull() throws IOException;
 
-	/**
-	 * Reads a BDF null from the input.
-	 */
 	void readNull() throws IOException;
 
-	/**
-	 * Skips over a BDF null.
-	 */
 	void skipNull() throws IOException;
 
-	/**
-	 * Returns true if the next object in the input is a BDF boolean.
-	 */
 	boolean hasBoolean() throws IOException;
 
-	/**
-	 * Reads a BDF boolean from the input and returns it.
-	 */
 	boolean readBoolean() throws IOException;
 
-	/**
-	 * Skips over a BDF boolean.
-	 */
 	void skipBoolean() throws IOException;
 
-	/**
-	 * Returns true if the next object in the input is a BDF integer, which
-	 * has the same range as a Java long.
-	 */
 	boolean hasLong() throws IOException;
 
-	/**
-	 * Reads a BDF integer from the input and returns it as a Java long.
-	 */
 	long readLong() throws IOException;
 
-	/**
-	 * Skips over a BDF integer.
-	 */
 	void skipLong() throws IOException;
 
-	/**
-	 * Returns true if the next object in the input is a BDF integer and the
-	 * value would fit within the range of a Java int.
-	 */
-	boolean hasInt() throws IOException;
-
-	/**
-	 * Reads a BDF integer from the input and returns it as a Java int.
-	 *
-	 * @throws FormatException if the value exceeds the range of a Java int.
-	 */
-	int readInt() throws IOException;
-
-	/**
-	 * Skips over a BDF integer.
-	 *
-	 * @throws FormatException if the value exceeds the range of a Java int.
-	 */
-	void skipInt() throws IOException;
-
-	/**
-	 * Returns true if the next object in the input is a BDF float, which has
-	 * the same range as a Java double.
-	 */
 	boolean hasDouble() throws IOException;
 
-	/**
-	 * Reads a BDF float from the input and returns it as a Java double.
-	 */
 	double readDouble() throws IOException;
 
-	/**
-	 * Skips over a BDF float.
-	 */
 	void skipDouble() throws IOException;
 
-	/**
-	 * Returns true if the next object in the input is a BDF string.
-	 */
 	boolean hasString() throws IOException;
 
-	/**
-	 * Reads a BDF string from the input.
-	 *
-	 * @throws IOException If the string is not valid UTF-8.
-	 */
 	String readString() throws IOException;
 
-	/**
-	 * Skips over a BDF string without checking whether it is valid UTF-8.
-	 */
 	void skipString() throws IOException;
 
-	/**
-	 * Returns true if the next object in the input is a BDF raw.
-	 */
 	boolean hasRaw() throws IOException;
 
-	/**
-	 * Reads a BDF raw from the input and returns it as a byte array.
-	 */
 	byte[] readRaw() throws IOException;
 
-	/**
-	 * Skips over a BDF raw.
-	 */
 	void skipRaw() throws IOException;
 
-	/**
-	 * Returns true if the next object in the input is a BDF list.
-	 */
 	boolean hasList() throws IOException;
 
-	/**
-	 * Reads a BDF list from the input and returns it. The list's contents
-	 * are parsed and validated.
-	 */
 	BdfList readList() throws IOException;
 
-	/**
-	 * Skips over a BDF list. The list's contents are parsed (to determine
-	 * their length) but not validated.
-	 */
+	void readListStart() throws IOException;
+
+	boolean hasListEnd() throws IOException;
+
+	void readListEnd() throws IOException;
+
 	void skipList() throws IOException;
 
-	/**
-	 * Returns true if the next object in the input is a BDF dictionary.
-	 */
 	boolean hasDictionary() throws IOException;
 
-	/**
-	 * Reads a BDF dictionary from the input and returns it. The dictionary's
-	 * contents are parsed and validated.
-	 */
 	BdfDictionary readDictionary() throws IOException;
 
-	/**
-	 * Skips over a BDF dictionary. The dictionary's contents are parsed
-	 * (to determine their length) but not validated.
-	 */
+	void readDictionaryStart() throws IOException;
+
+	boolean hasDictionaryEnd() throws IOException;
+
+	void readDictionaryEnd() throws IOException;
+
 	void skipDictionary() throws IOException;
 }

bramble-api/src/main/java/org/briarproject/bramble/api/data/BdfReaderFactory.java

@@ -9,14 +9,6 @@ public interface BdfReaderFactory {
 
 	BdfReader createReader(InputStream in);
 
-	/**
-	 * Transitional alternative to {@link #createReader(InputStream)} that
-	 * can create a reader that accepts non-canonical input, for backward
-	 * compatibility.
-	 */
-	@Deprecated
-	BdfReader createReader(InputStream in, boolean canonical);
-
 	BdfReader createReader(InputStream in, int nestedLimit,
-			int maxBufferSize, boolean canonical);
+			int maxBufferSize);
 }

bramble-api/src/main/java/org/briarproject/bramble/api/data/BdfWriter.java

@@ -1,74 +1,36 @@
 package org.briarproject.bramble.api.data;
 
-import org.briarproject.bramble.api.FormatException;
-
 import java.io.IOException;
 import java.util.Collection;
 import java.util.Map;
 
-/**
- * An interface for writing BDF objects to an output stream. The BDF output
- * is in canonical form, ie integers and length fields are represented using
- * the minimum number of bytes and dictionary keys are unique and sorted in
- * lexicographic order.
- */
 public interface BdfWriter {
 
-	/**
-	 * Flushes the writer's output stream.
-	 */
 	void flush() throws IOException;
 
-	/**
-	 * Closes the writer's output stream.
-	 */
 	void close() throws IOException;
 
-	/**
-	 * Writes a BDF null to the output stream.
-	 */
 	void writeNull() throws IOException;
 
-	/**
-	 * Writes a BDF boolean to the output stream.
-	 */
 	void writeBoolean(boolean b) throws IOException;
 
-	/**
-	 * Writes a BDF integer (which has the same range as a Java long) to the
-	 * output stream.
-	 */
 	void writeLong(long l) throws IOException;
 
-	/**
-	 * Writes a BDF float (which has the same range as a Java double) to the
-	 * output stream.
-	 */
 	void writeDouble(double d) throws IOException;
 
-	/**
-	 * Writes a BDF string (which uses UTF-8 encoding) to the output stream.
-	 */
 	void writeString(String s) throws IOException;
 
-	/**
-	 * Writes a BDF raw to the output stream.
-	 */
 	void writeRaw(byte[] b) throws IOException;
 
-	/**
-	 * Writes a BDF list to the output stream.
-	 *
-	 * @throws FormatException if the contents of the given collection cannot
-	 * be represented as (nested) BDF objects.
-	 */
 	void writeList(Collection<?> c) throws IOException;
 
-	/**
-	 * Writes a BDF dictionary to the output stream.
-	 *
-	 * @throws FormatException if the contents of the given map cannot be
-	 * represented as (nested) BDF objects.
-	 */
+	void writeListStart() throws IOException;
+
+	void writeListEnd() throws IOException;
+
 	void writeDictionary(Map<?, ?> m) throws IOException;
+
+	void writeDictionaryStart() throws IOException;
+
+	void writeDictionaryEnd() throws IOException;
 }

bramble-api/src/main/java/org/briarproject/bramble/api/keyagreement/KeyAgreementConstants.java

@@ -1,26 +1,18 @@
 package org.briarproject.bramble.api.keyagreement;
 
-import org.briarproject.bramble.api.mailbox.MailboxConstants;
-
 public interface KeyAgreementConstants {
 
+	/**
+	 * The version of the BQP protocol used in beta releases. This version
+	 * number is reserved.
+	 */
+	byte BETA_PROTOCOL_VERSION = 89;
+
 	/**
 	 * The current version of the BQP protocol.
 	 */
 	byte PROTOCOL_VERSION = 4;
 
-	/**
-	 * The QR code format identifier, used to distinguish BQP QR codes from
-	 * QR codes used for other purposes. See
-	 * {@link MailboxConstants#QR_FORMAT_ID}.
-	 */
-	byte QR_FORMAT_ID = 0;
-
-	/**
-	 * The QR code format version.
-	 */
-	byte QR_FORMAT_VERSION = PROTOCOL_VERSION;
-
 	/**
 	 * The length of the BQP key commitment in bytes.
 	 */

bramble-api/src/main/java/org/briarproject/bramble/api/keyagreement/PayloadParser.java

@@ -7,5 +7,5 @@ import java.io.IOException;
 @NotNullByDefault
 public interface PayloadParser {
 
-	Payload parse(String payload) throws IOException;
+	Payload parse(byte[] raw) throws IOException;
 }

bramble-api/src/main/java/org/briarproject/bramble/api/mailbox/MailboxConstants.java

@@ -1,6 +1,5 @@
 package org.briarproject.bramble.api.mailbox;
 
-import org.briarproject.bramble.api.keyagreement.KeyAgreementConstants;
 import org.briarproject.bramble.api.plugin.TransportId;
 
 import java.util.List;
@@ -20,18 +19,6 @@ public interface MailboxConstants {
 	 */
 	TransportId ID = new TransportId("org.briarproject.bramble.mailbox");
 
-	/**
-	 * The QR code format identifier, used to distinguish mailbox QR codes
-	 * from QR codes used for other purposes. See
-	 * {@link KeyAgreementConstants#QR_FORMAT_ID};
-	 */
-	byte QR_FORMAT_ID = 1;
-
-	/**
-	 * The QR code format version.
-	 */
-	byte QR_FORMAT_VERSION = 0;
-
 	/**
 	 * Mailbox API versions that we support as a client. This is reported to our
 	 * contacts by {@link MailboxUpdateManager}.

bramble-api/src/main/java/org/briarproject/bramble/api/mailbox/MailboxManager.java

@@ -1,6 +1,5 @@
 package org.briarproject.bramble.api.mailbox;
 
-import org.briarproject.bramble.api.FormatException;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.db.Transaction;
 import org.briarproject.bramble.api.lifecycle.IoExecutor;
@@ -35,16 +34,6 @@ public interface MailboxManager {
 	 */
 	MailboxPairingTask startPairingTask(String qrCodePayload);
 
-	/**
-	 * Takes a textual QR code representation in
-	 * {@link org.briarproject.bramble.util.Base32} format and converts it
-	 * into a qrCodePayload as expected by {@link #startPairingTask(String)}.
-	 *
-	 * @throws FormatException when the provided payload did not include a
-	 * proper briar-mailbox:// link.
-	 */
-	String convertBase32Payload(String base32Payload) throws FormatException;
-
 	/**
 	 * Can be used by the UI to test the mailbox connection.
 	 *

bramble-api/src/main/java/org/briarproject/bramble/api/mailbox/MailboxPairingState.java

@@ -1,44 +1,17 @@
 package org.briarproject.bramble.api.mailbox;
 
-import org.briarproject.bramble.api.qrcode.QrCodeClassifier.QrCodeType;
-
 public abstract class MailboxPairingState {
 
-	public abstract static class Pending extends MailboxPairingState {
-
-		public final long timeStarted;
-
-		private Pending(long timeStarted) {
-			this.timeStarted = timeStarted;
-		}
+	public static class QrCodeReceived extends MailboxPairingState {
 	}
 
-	public static class QrCodeReceived extends Pending {
-
-		public QrCodeReceived(long timeStarted) {
-			super(timeStarted);
-		}
-	}
-
-	public static class Pairing extends Pending {
-
-		public Pairing(long timeStarted) {
-			super(timeStarted);
-		}
+	public static class Pairing extends MailboxPairingState {
 	}
 
 	public static class Paired extends MailboxPairingState {
 	}
 
 	public static class InvalidQrCode extends MailboxPairingState {
-
-		public final QrCodeType qrCodeType;
-		public final int formatVersion;
-
-		public InvalidQrCode(QrCodeType qrCodeType, int formatVersion) {
-			this.qrCodeType = qrCodeType;
-			this.formatVersion = formatVersion;
-		}
 	}
 
 	public static class MailboxAlreadyPaired extends MailboxPairingState {

bramble-api/src/main/java/org/briarproject/bramble/api/network/NetworkStatus.java

@@ -2,7 +2,6 @@ package org.briarproject.bramble.api.network;
 
 import org.briarproject.nullsafety.NotNullByDefault;
 
-import javax.annotation.Nullable;
 import javax.annotation.concurrent.Immutable;
 
 @Immutable
@@ -28,20 +27,4 @@ public class NetworkStatus {
 	public boolean isIpv6Only() {
 		return ipv6Only;
 	}
-
-	@Override
-	public int hashCode() {
-		return (connected ? 1 : 0) | (wifi ? 2 : 0) | (ipv6Only ? 4 : 0);
-	}
-
-	@Override
-	public boolean equals(@Nullable Object o) {
-		if (o instanceof NetworkStatus) {
-			NetworkStatus s = (NetworkStatus) o;
-			return connected == s.connected
-					&& wifi == s.wifi
-					&& ipv6Only == s.ipv6Only;
-		}
-		return false;
-	}
 }

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/TorConstants.java

@@ -27,6 +27,8 @@ public interface TorConstants {
 	int PREF_TOR_NETWORK_AUTOMATIC = 0;
 	int PREF_TOR_NETWORK_WITHOUT_BRIDGES = 1;
 	int PREF_TOR_NETWORK_WITH_BRIDGES = 2;
+	// TODO: Remove when settings migration code is removed
+	int PREF_TOR_NETWORK_NEVER = 3;
 
 	// Default values for local settings
 	boolean DEFAULT_PREF_PLUGIN_ENABLE = true;

bramble-api/src/main/java/org/briarproject/bramble/api/qrcode/QrCodeClassifier.java

@@ -1,16 +0,0 @@
-package org.briarproject.bramble.api.qrcode;
-
-import org.briarproject.bramble.api.Pair;
-import org.briarproject.nullsafety.NotNullByDefault;
-
-@NotNullByDefault
-public interface QrCodeClassifier {
-
-	enum QrCodeType {
-		BQP,
-		MAILBOX,
-		UNKNOWN
-	}
-
-	Pair<QrCodeType, Integer> classifyQrCode(String payload);
-}

bramble-api/src/main/java/org/briarproject/bramble/api/qrcode/WrongQrCodeTypeException.java

@@ -1,25 +0,0 @@
-package org.briarproject.bramble.api.qrcode;
-
-import org.briarproject.bramble.api.FormatException;
-import org.briarproject.bramble.api.qrcode.QrCodeClassifier.QrCodeType;
-import org.briarproject.nullsafety.NotNullByDefault;
-
-import javax.annotation.concurrent.Immutable;
-
-/**
- * Thrown when a QR code that has been scanned does not have the expected type.
- */
-@Immutable
-@NotNullByDefault
-public class WrongQrCodeTypeException extends FormatException {
-
-	private final QrCodeType qrCodeType;
-
-	public WrongQrCodeTypeException(QrCodeType qrCodeType) {
-		this.qrCodeType = qrCodeType;
-	}
-
-	public QrCodeType getQrCodeType() {
-		return qrCodeType;
-	}
-}

bramble-api/src/main/java/org/briarproject/bramble/api/record/RecordReader.java

@@ -32,15 +32,8 @@ public interface RecordReader {
 	 * 'accept' or 'ignore' predicates
 	 */
 	@Nullable
-	Record readRecord(RecordPredicate accept, RecordPredicate ignore)
+	Record readRecord(Predicate<Record> accept, Predicate<Record> ignore)
 			throws IOException;
 
 	void close() throws IOException;
-
-	/**
-	 * Interface that reifies the generic interface {@code Predicate<Record>}
-	 * for easier testing.
-	 */
-	interface RecordPredicate extends Predicate<Record> {
-	}
 }

bramble-api/src/main/java/org/briarproject/bramble/api/system/LocationUtils.java

@@ -0,0 +1,16 @@
+package org.briarproject.bramble.api.system;
+
+import org.briarproject.nullsafety.NotNullByDefault;
+
+@NotNullByDefault
+public interface LocationUtils {
+
+	/**
+	 * Get the country the device is currently located in, or "" if it cannot
+	 * be determined.
+	 * <p>
+	 * The country codes are formatted upper-case and as per <a href="
+	 * https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2">ISO 3166-1 alpha 2</a>.
+	 */
+	String getCurrentCountry();
+}

bramble-api/src/main/java/org/briarproject/bramble/util/OsUtils.java

@@ -4,8 +4,6 @@ import org.briarproject.nullsafety.NotNullByDefault;
 
 import javax.annotation.Nullable;
 
-import static org.briarproject.bramble.util.StringUtils.startsWithIgnoreCase;
-
 @NotNullByDefault
 public class OsUtils {
 
@@ -15,15 +13,15 @@ public class OsUtils {
 	private static final String vendor = System.getProperty("java.vendor");
 
 	public static boolean isWindows() {
-		return os != null && startsWithIgnoreCase(os, "Win");
+		return os != null && os.contains("Windows");
 	}
 
 	public static boolean isMac() {
-		return os != null && os.equalsIgnoreCase("Mac OS X");
+		return os != null && os.contains("Mac OS");
 	}
 
 	public static boolean isLinux() {
-		return os != null && startsWithIgnoreCase(os, "Linux") && !isAndroid();
+		return os != null && os.contains("Linux") && !isAndroid();
 	}
 
 	public static boolean isAndroid() {

bramble-api/src/main/java/org/briarproject/bramble/util/PrivacyUtils.java

@@ -6,7 +6,6 @@ import java.net.Inet4Address;
 import java.net.InetAddress;
 import java.net.InetSocketAddress;
 import java.net.SocketAddress;
-import java.util.Locale;
 
 import javax.annotation.Nullable;
 
@@ -52,7 +51,7 @@ public class PrivacyUtils {
 	}
 
 	private static String scrubIpv6Address(byte[] ipv6) {
-		String hex = toHexString(ipv6).toLowerCase(Locale.US);
+		String hex = toHexString(ipv6).toLowerCase();
 		return hex.substring(0, 2) + "[scrubbed]" + hex.substring(30);
 	}
 

bramble-api/src/main/java/org/briarproject/bramble/util/StringUtils.java

@@ -3,6 +3,7 @@ package org.briarproject.bramble.util;
 import org.briarproject.bramble.api.FormatException;
 import org.briarproject.nullsafety.NotNullByDefault;
 
+import java.io.UnsupportedEncodingException;
 import java.nio.ByteBuffer;
 import java.nio.charset.CharacterCodingException;
 import java.nio.charset.Charset;
@@ -14,21 +15,15 @@ import java.util.regex.Pattern;
 import javax.annotation.Nullable;
 
 import static java.nio.charset.CodingErrorAction.IGNORE;
-import static java.nio.charset.CodingErrorAction.REPORT;
 import static java.util.regex.Pattern.CASE_INSENSITIVE;
 
-@SuppressWarnings("CharsetObjectCanBeUsed")
 @NotNullByDefault
 public class StringUtils {
 
-	public static final Charset UTF_8 = Charset.forName("UTF-8");
-	public static final Charset US_ASCII = Charset.forName("US-ASCII");
-	public static final Charset ISO_8859_1 = Charset.forName("ISO-8859-1");
-
-	private static final Pattern MAC =
-			Pattern.compile("[0-9a-f]{2}:[0-9a-f]{2}:" +
-							"[0-9a-f]{2}:[0-9a-f]{2}:[0-9a-f]{2}:[0-9a-f]{2}",
-					CASE_INSENSITIVE);
+	private static final Charset UTF_8 = Charset.forName("UTF-8");
+	private static Pattern MAC = Pattern.compile("[0-9a-f]{2}:[0-9a-f]{2}:" +
+					"[0-9a-f]{2}:[0-9a-f]{2}:[0-9a-f]{2}:[0-9a-f]{2}",
+			CASE_INSENSITIVE);
 
 	private static final char[] HEX = new char[] {
 			'0', '1', '2', '3', '4', '5', '6', '7',
@@ -50,41 +45,33 @@ public class StringUtils {
 	}
 
 	public static byte[] toUtf8(String s) {
-		return s.getBytes(UTF_8);
+		try {
+			return s.getBytes("UTF-8");
+		} catch (UnsupportedEncodingException e) {
+			throw new AssertionError(e);
+		}
 	}
 
-	public static String fromUtf8(byte[] bytes) throws FormatException {
-		return fromUtf8(bytes, 0, bytes.length, true);
+	public static String fromUtf8(byte[] bytes) {
+		return fromUtf8(bytes, 0, bytes.length);
 	}
 
-	public static String fromUtf8(byte[] bytes, int off, int len)
-			throws FormatException {
-		return fromUtf8(bytes, off, len, true);
-	}
-
-	private static String fromUtf8(byte[] bytes, int off, int len,
-			boolean strict) throws FormatException {
+	public static String fromUtf8(byte[] bytes, int off, int len) {
 		CharsetDecoder decoder = UTF_8.newDecoder();
-		decoder.onMalformedInput(strict ? REPORT : IGNORE);
-		decoder.onUnmappableCharacter(strict ? REPORT : IGNORE);
+		decoder.onMalformedInput(IGNORE);
+		decoder.onUnmappableCharacter(IGNORE);
 		ByteBuffer buffer = ByteBuffer.wrap(bytes, off, len);
 		try {
 			return decoder.decode(buffer).toString();
 		} catch (CharacterCodingException e) {
-			throw new FormatException();
+			throw new AssertionError(e);
 		}
 	}
 
 	public static String truncateUtf8(String s, int maxUtf8Length) {
 		byte[] utf8 = toUtf8(s);
 		if (utf8.length <= maxUtf8Length) return s;
-		// Don't be strict when converting back, so that if we truncate a
-		// multi-byte character the whole character gets dropped
-		try {
-			return fromUtf8(utf8, 0, maxUtf8Length, false);
-		} catch (FormatException e) {
-			throw new AssertionError(e);
-		}
+		return fromUtf8(utf8, 0, maxUtf8Length);
 	}
 
 	/**
@@ -176,9 +163,4 @@ public class StringUtils {
 		}
 		return new String(c);
 	}
-
-	// see https://stackoverflow.com/a/38947571
-	static boolean startsWithIgnoreCase(String s, String prefix) {
-		return s.regionMatches(true, 0, prefix, 0, prefix.length());
-	}
 }

bramble-api/src/test/java/org/briarproject/bramble/api/data/BdfDictionaryTest.java

@@ -1,7 +1,6 @@
 package org.briarproject.bramble.api.data;
 
 import org.briarproject.bramble.api.Bytes;
-import org.briarproject.bramble.api.FormatException;
 import org.briarproject.bramble.test.BrambleTestCase;
 import org.junit.Test;
 
@@ -9,12 +8,9 @@ import java.util.Collections;
 import java.util.Iterator;
 import java.util.Map.Entry;
 
-import static java.lang.Boolean.TRUE;
-import static java.util.Collections.singletonMap;
 import static org.briarproject.bramble.api.data.BdfDictionary.NULL_VALUE;
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertTrue;
 
 public class BdfDictionaryTest extends BrambleTestCase {
@@ -23,20 +19,20 @@ public class BdfDictionaryTest extends BrambleTestCase {
 	public void testConstructors() {
 		assertEquals(Collections.<String, Object>emptyMap(),
 				new BdfDictionary());
-		assertEquals(singletonMap("foo", NULL_VALUE),
-				new BdfDictionary(singletonMap("foo", NULL_VALUE)));
+		assertEquals(Collections.singletonMap("foo", NULL_VALUE),
+				new BdfDictionary(Collections.singletonMap("foo", NULL_VALUE)));
 	}
 
 	@Test
 	public void testFactoryMethod() {
 		assertEquals(Collections.<String, Object>emptyMap(),
 				BdfDictionary.of());
-		assertEquals(singletonMap("foo", NULL_VALUE),
+		assertEquals(Collections.singletonMap("foo", NULL_VALUE),
 				BdfDictionary.of(new BdfEntry("foo", NULL_VALUE)));
 	}
 
 	@Test
-	public void testLongPromotion() throws Exception {
+	public void testIntegerPromotion() throws Exception {
 		BdfDictionary d = new BdfDictionary();
 		d.put("foo", (byte) 1);
 		d.put("bar", (short) 2);
@@ -48,33 +44,6 @@ public class BdfDictionaryTest extends BrambleTestCase {
 		assertEquals(Long.valueOf(4), d.getLong("bam"));
 	}
 
-	@Test
-	public void testIntPromotionAndDemotion() throws Exception {
-		BdfDictionary d = new BdfDictionary();
-		d.put("foo", (byte) 1);
-		d.put("bar", (short) 2);
-		d.put("baz", 3);
-		d.put("bam", 4L);
-		assertEquals(Integer.valueOf(1), d.getInt("foo"));
-		assertEquals(Integer.valueOf(2), d.getInt("bar"));
-		assertEquals(Integer.valueOf(3), d.getInt("baz"));
-		assertEquals(Integer.valueOf(4), d.getInt("bam"));
-	}
-
-	@Test(expected = FormatException.class)
-	public void testIntUnderflow() throws Exception {
-		BdfDictionary d =
-				BdfDictionary.of(new BdfEntry("foo", Integer.MIN_VALUE - 1L));
-		d.getInt("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testIntOverflow() throws Exception {
-		BdfDictionary d =
-				BdfDictionary.of(new BdfEntry("foo", Integer.MAX_VALUE + 1L));
-		d.getInt("foo");
-	}
-
 	@Test
 	public void testFloatPromotion() throws Exception {
 		BdfDictionary d = new BdfDictionary();
@@ -98,7 +67,7 @@ public class BdfDictionaryTest extends BrambleTestCase {
 	}
 
 	@Test
-	public void testKeySetIteratorIsOrderedByKeys() {
+	public void testKeySetIteratorIsOrderedByKeys() throws Exception {
 		BdfDictionary d = new BdfDictionary();
 		d.put("a", 1);
 		d.put("d", 4);
@@ -117,7 +86,7 @@ public class BdfDictionaryTest extends BrambleTestCase {
 	}
 
 	@Test
-	public void testValuesIteratorIsOrderedByKeys() {
+	public void testValuesIteratorIsOrderedByKeys() throws Exception {
 		BdfDictionary d = new BdfDictionary();
 		d.put("a", 1);
 		d.put("d", 4);
@@ -136,7 +105,7 @@ public class BdfDictionaryTest extends BrambleTestCase {
 	}
 
 	@Test
-	public void testEntrySetIteratorIsOrderedByKeys() {
+	public void testEntrySetIteratorIsOrderedByKeys() throws Exception {
 		BdfDictionary d = new BdfDictionary();
 		d.put("a", 1);
 		d.put("d", 4);
@@ -161,284 +130,4 @@ public class BdfDictionaryTest extends BrambleTestCase {
 		assertEquals("d", e.getKey());
 		assertEquals(4, e.getValue());
 	}
-
-	@Test(expected = FormatException.class)
-	public void testMissingValueForBooleanThrowsFormatException()
-			throws Exception {
-		new BdfDictionary().getBoolean("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testMissingValueForLongThrowsFormatException()
-			throws Exception {
-		new BdfDictionary().getLong("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testMissingValueForIntThrowsFormatException() throws Exception {
-		new BdfDictionary().getInt("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testMissingValueForDoubleThrowsFormatException()
-			throws Exception {
-		new BdfDictionary().getDouble("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testMissingValueForStringThrowsFormatException()
-			throws Exception {
-		new BdfDictionary().getString("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testMissingValueForRawThrowsFormatException() throws Exception {
-		new BdfDictionary().getRaw("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testMissingValueForListThrowsFormatException()
-			throws Exception {
-		new BdfDictionary().getList("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testMissingValueForDictionaryThrowsFormatException()
-			throws Exception {
-		new BdfDictionary().getDictionary("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testNullValueForBooleanThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", NULL_VALUE)).getBoolean("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testNullValueForLongThrowsFormatException() throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", NULL_VALUE)).getLong("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testNullValueForIntThrowsFormatException() throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", NULL_VALUE)).getInt("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testNullValueForDoubleThrowsFormatException() throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", NULL_VALUE)).getDouble("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testNullValueForStringThrowsFormatException() throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", NULL_VALUE)).getString("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testNullValueForRawThrowsFormatException() throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", NULL_VALUE)).getRaw("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testNullValueForListThrowsFormatException() throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", NULL_VALUE)).getList("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testNullValueForDictionaryThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", NULL_VALUE)).getDictionary("foo");
-	}
-
-	@Test
-	public void testOptionalMethodsReturnNullForMissingValue()
-			throws Exception {
-		testOptionalMethodsReturnNull(new BdfDictionary());
-	}
-
-	@Test
-	public void testOptionalMethodsReturnNullForNullValue() throws Exception {
-		BdfDictionary d = BdfDictionary.of(new BdfEntry("foo", NULL_VALUE));
-		testOptionalMethodsReturnNull(d);
-	}
-
-	private void testOptionalMethodsReturnNull(BdfDictionary d)
-			throws Exception {
-		assertNull(d.getOptionalBoolean("foo"));
-		assertNull(d.getOptionalLong("foo"));
-		assertNull(d.getOptionalInt("foo"));
-		assertNull(d.getOptionalDouble("foo"));
-		assertNull(d.getOptionalString("foo"));
-		assertNull(d.getOptionalRaw("foo"));
-		assertNull(d.getOptionalList("foo"));
-		assertNull(d.getOptionalDictionary("foo"));
-	}
-
-	@Test
-	public void testDefaultMethodsReturnDefaultForMissingValue()
-			throws Exception {
-		testDefaultMethodsReturnDefault(new BdfDictionary());
-	}
-
-	@Test
-	public void testDefaultMethodsReturnDefaultForNullValue() throws Exception {
-		BdfDictionary d = BdfDictionary.of(new BdfEntry("foo", NULL_VALUE));
-		testDefaultMethodsReturnDefault(d);
-	}
-
-	private void testDefaultMethodsReturnDefault(BdfDictionary d)
-			throws Exception {
-		assertEquals(TRUE, d.getBoolean("foo", TRUE));
-		assertEquals(Long.valueOf(123L), d.getLong("foo", 123L));
-		assertEquals(Integer.valueOf(123), d.getInt("foo", 123));
-		assertEquals(Double.valueOf(123D), d.getDouble("foo", 123D));
-		assertEquals("123", d.getString("foo", "123"));
-		byte[] defaultRaw = {1, 2, 3};
-		assertArrayEquals(defaultRaw, d.getRaw("foo", defaultRaw));
-		BdfList defaultList = BdfList.of(1, 2, 3);
-		assertEquals(defaultList, d.getList("foo", defaultList));
-		BdfDictionary defaultDict = BdfDictionary.of(new BdfEntry("123", 123));
-		assertEquals(defaultDict, d.getDictionary("foo", defaultDict));
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForBooleanThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 123)).getBoolean("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForOptionalBooleanThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 123)).getOptionalBoolean("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForDefaultBooleanThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 123)).getBoolean("foo", true);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForLongThrowsFormatException() throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 1.23)).getLong("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForOptionalLongThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 1.23)).getOptionalLong("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForDefaultLongThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 1.23)).getLong("foo", 1L);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForIntThrowsFormatException() throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 1.23)).getInt("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForOptionalIntThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 1.23)).getOptionalInt("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForDefaultIntThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 1.23)).getInt("foo", 1);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForDoubleThrowsFormatException() throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 123)).getDouble("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForOptionalDoubleThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 123)).getOptionalDouble("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForDefaultDoubleThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 123)).getDouble("foo", 1D);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForStringThrowsFormatException() throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 123)).getString("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForOptionalStringThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 123)).getOptionalString("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForDefaultStringThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 123)).getString("foo", "");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForRawThrowsFormatException() throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 123)).getRaw("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForOptionalRawThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 123)).getOptionalRaw("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForDefaultRawThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 123)).getRaw("foo", new byte[0]);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForListThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 123)).getList("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForOptionalListThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 123)).getOptionalList("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForDefaultListThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 123)).getList("foo",
-				new BdfList());
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForDictionaryThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 123)).getDictionary("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForOptionalDictionaryThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 123)).getOptionalDictionary("foo");
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForDefaultDictionaryThrowsFormatException()
-			throws Exception {
-		BdfDictionary.of(new BdfEntry("foo", 123)).getDictionary("foo",
-				new BdfDictionary());
-	}
 }

bramble-api/src/test/java/org/briarproject/bramble/api/data/BdfListTest.java

@@ -5,31 +5,31 @@ import org.briarproject.bramble.api.FormatException;
 import org.briarproject.bramble.test.BrambleTestCase;
 import org.junit.Test;
 
-import static java.lang.Boolean.TRUE;
-import static java.util.Arrays.asList;
-import static java.util.Collections.emptyList;
+import java.util.Arrays;
+import java.util.Collections;
+
 import static org.briarproject.bramble.api.data.BdfDictionary.NULL_VALUE;
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertNull;
 
 public class BdfListTest extends BrambleTestCase {
 
 	@Test
 	public void testConstructors() {
-		assertEquals(emptyList(), new BdfList());
-		assertEquals(asList(1, 2, NULL_VALUE),
-				new BdfList(asList(1, 2, NULL_VALUE)));
+		assertEquals(Collections.emptyList(), new BdfList());
+		assertEquals(Arrays.asList(1, 2, NULL_VALUE),
+				new BdfList(Arrays.asList(1, 2, NULL_VALUE)));
 	}
 
 	@Test
 	public void testFactoryMethod() {
-		assertEquals(emptyList(), BdfList.of());
-		assertEquals(asList(1, 2, NULL_VALUE), BdfList.of(1, 2, NULL_VALUE));
+		assertEquals(Collections.emptyList(), BdfList.of());
+		assertEquals(Arrays.asList(1, 2, NULL_VALUE),
+				BdfList.of(1, 2, NULL_VALUE));
 	}
 
 	@Test
-	public void testLongPromotion() throws Exception {
+	public void testIntegerPromotion() throws Exception {
 		BdfList list = new BdfList();
 		list.add((byte) 1);
 		list.add((short) 2);
@@ -41,31 +41,6 @@ public class BdfListTest extends BrambleTestCase {
 		assertEquals(Long.valueOf(4), list.getLong(3));
 	}
 
-	@Test
-	public void testIntPromotionAndDemotion() throws Exception {
-		BdfList list = new BdfList();
-		list.add((byte) 1);
-		list.add((short) 2);
-		list.add(3);
-		list.add(4L);
-		assertEquals(Integer.valueOf(1), list.getInt(0));
-		assertEquals(Integer.valueOf(2), list.getInt(1));
-		assertEquals(Integer.valueOf(3), list.getInt(2));
-		assertEquals(Integer.valueOf(4), list.getInt(3));
-	}
-
-	@Test(expected = FormatException.class)
-	public void testIntUnderflow() throws Exception {
-		BdfList list = BdfList.of(Integer.MIN_VALUE - 1L);
-		list.getInt(0);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testIntOverflow() throws Exception {
-		BdfList list = BdfList.of(Integer.MAX_VALUE + 1L);
-		list.getInt(0);
-	}
-
 	@Test
 	public void testFloatPromotion() throws Exception {
 		BdfList list = new BdfList();
@@ -88,6 +63,61 @@ public class BdfListTest extends BrambleTestCase {
 		assertArrayEquals(new byte[123], second);
 	}
 
+	@Test
+	@SuppressWarnings("ConstantConditions")
+	public void testIndexOutOfBoundsReturnsDefaultValue() throws Exception {
+		BdfList list = BdfList.of(1, 2, 3);
+		boolean defaultBoolean = true;
+		assertEquals(defaultBoolean, list.getBoolean(-1, defaultBoolean));
+		assertEquals(defaultBoolean, list.getBoolean(3, defaultBoolean));
+		Long defaultLong = 123L;
+		assertEquals(defaultLong, list.getLong(-1, defaultLong));
+		assertEquals(defaultLong, list.getLong(3, defaultLong));
+		Double defaultDouble = 1.23;
+		assertEquals(defaultDouble, list.getDouble(-1, defaultDouble));
+		assertEquals(defaultDouble, list.getDouble(3, defaultDouble));
+		String defaultString = "123";
+		assertEquals(defaultString, list.getString(-1, defaultString));
+		assertEquals(defaultString, list.getString(3, defaultString));
+		byte[] defaultBytes = new byte[] {1, 2, 3};
+		assertArrayEquals(defaultBytes, list.getRaw(-1, defaultBytes));
+		assertArrayEquals(defaultBytes, list.getRaw(3, defaultBytes));
+		BdfList defaultList = BdfList.of(1, 2, 3);
+		assertEquals(defaultList, list.getList(-1, defaultList));
+		assertEquals(defaultList, list.getList(3, defaultList));
+		BdfDictionary defaultDict = BdfDictionary.of(
+				new BdfEntry("1", 1),
+				new BdfEntry("2", 2),
+				new BdfEntry("3", 3)
+		);
+		assertEquals(defaultDict, list.getDictionary(-1, defaultDict));
+		assertEquals(defaultDict, list.getDictionary(3, defaultDict));
+	}
+
+	@Test
+	@SuppressWarnings("ConstantConditions")
+	public void testWrongTypeReturnsDefaultValue() throws Exception {
+		BdfList list = BdfList.of(1, 2, 3, true);
+		boolean defaultBoolean = true;
+		assertEquals(defaultBoolean, list.getBoolean(0, defaultBoolean));
+		Long defaultLong = 123L;
+		assertEquals(defaultLong, list.getLong(3, defaultLong));
+		Double defaultDouble = 1.23;
+		assertEquals(defaultDouble, list.getDouble(0, defaultDouble));
+		String defaultString = "123";
+		assertEquals(defaultString, list.getString(0, defaultString));
+		byte[] defaultBytes = new byte[] {1, 2, 3};
+		assertArrayEquals(defaultBytes, list.getRaw(0, defaultBytes));
+		BdfList defaultList = BdfList.of(1, 2, 3);
+		assertEquals(defaultList, list.getList(0, defaultList));
+		BdfDictionary defaultDict = BdfDictionary.of(
+				new BdfEntry("1", 1),
+				new BdfEntry("2", 2),
+				new BdfEntry("3", 3)
+		);
+		assertEquals(defaultDict, list.getDictionary(0, defaultDict));
+	}
+
 	@Test(expected = FormatException.class)
 	public void testNegativeIndexForBooleanThrowsFormatException()
 			throws Exception {
@@ -100,12 +130,6 @@ public class BdfListTest extends BrambleTestCase {
 		new BdfList().getOptionalBoolean(-1);
 	}
 
-	@Test(expected = FormatException.class)
-	public void testNegativeIndexForDefaultBooleanThrowsFormatException()
-			throws Exception {
-		new BdfList().getBoolean(-1, true);
-	}
-
 	@Test(expected = FormatException.class)
 	public void testNegativeIndexForLongThrowsFormatException()
 			throws Exception {
@@ -118,30 +142,6 @@ public class BdfListTest extends BrambleTestCase {
 		new BdfList().getOptionalLong(-1);
 	}
 
-	@Test(expected = FormatException.class)
-	public void testNegativeIndexForDefaultLongThrowsFormatException()
-			throws Exception {
-		new BdfList().getLong(-1, 1L);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testNegativeIndexForIntThrowsFormatException()
-			throws Exception {
-		new BdfList().getInt(-1);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testNegativeIndexForOptionalIntThrowsFormatException()
-			throws Exception {
-		new BdfList().getOptionalInt(-1);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testNegativeIndexForDefaultIntThrowsFormatException()
-			throws Exception {
-		new BdfList().getInt(-1, 1);
-	}
-
 	@Test(expected = FormatException.class)
 	public void testNegativeIndexForDoubleThrowsFormatException()
 			throws Exception {
@@ -154,12 +154,6 @@ public class BdfListTest extends BrambleTestCase {
 		new BdfList().getOptionalDouble(-1);
 	}
 
-	@Test(expected = FormatException.class)
-	public void testNegativeIndexForDefaultDoubleThrowsFormatException()
-			throws Exception {
-		new BdfList().getDouble(-1, 1D);
-	}
-
 	@Test(expected = FormatException.class)
 	public void testNegativeIndexForStringThrowsFormatException()
 			throws Exception {
@@ -172,12 +166,6 @@ public class BdfListTest extends BrambleTestCase {
 		new BdfList().getOptionalString(-1);
 	}
 
-	@Test(expected = FormatException.class)
-	public void testNegativeIndexForDefaultStringThrowsFormatException()
-			throws Exception {
-		new BdfList().getString(-1, "");
-	}
-
 	@Test(expected = FormatException.class)
 	public void testNegativeIndexForRawThrowsFormatException()
 			throws Exception {
@@ -190,12 +178,6 @@ public class BdfListTest extends BrambleTestCase {
 		new BdfList().getOptionalRaw(-1);
 	}
 
-	@Test(expected = FormatException.class)
-	public void testNegativeIndexForDefaultRawThrowsFormatException()
-			throws Exception {
-		new BdfList().getRaw(-1, new byte[0]);
-	}
-
 	@Test(expected = FormatException.class)
 	public void testNegativeIndexForListThrowsFormatException()
 			throws Exception {
@@ -208,11 +190,6 @@ public class BdfListTest extends BrambleTestCase {
 		new BdfList().getOptionalList(-1);
 	}
 
-	@Test(expected = FormatException.class)
-	public void testNegativeIndexForDefaultListThrowsFormatException()
-			throws Exception {
-		new BdfList().getList(-1, new BdfList());
-	}
 
 	@Test(expected = FormatException.class)
 	public void testNegativeIndexForDictionaryThrowsFormatException()
@@ -226,12 +203,6 @@ public class BdfListTest extends BrambleTestCase {
 		new BdfList().getOptionalDictionary(-1);
 	}
 
-	@Test(expected = FormatException.class)
-	public void testNegativeIndexForDefaultDictionaryThrowsFormatException()
-			throws Exception {
-		new BdfList().getDictionary(-1, new BdfDictionary());
-	}
-
 	@Test(expected = FormatException.class)
 	public void testTooLargeIndexForBooleanThrowsFormatException()
 			throws Exception {
@@ -244,12 +215,6 @@ public class BdfListTest extends BrambleTestCase {
 		new BdfList().getOptionalBoolean(0);
 	}
 
-	@Test(expected = FormatException.class)
-	public void testTooLargeIndexForDefaultBooleanThrowsFormatException()
-			throws Exception {
-		new BdfList().getBoolean(0, true);
-	}
-
 	@Test(expected = FormatException.class)
 	public void testTooLargeIndexForLongThrowsFormatException()
 			throws Exception {
@@ -262,30 +227,6 @@ public class BdfListTest extends BrambleTestCase {
 		new BdfList().getOptionalLong(0);
 	}
 
-	@Test(expected = FormatException.class)
-	public void testTooLargeIndexForDefaultLongThrowsFormatException()
-			throws Exception {
-		new BdfList().getLong(0, 1L);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testTooLargeIndexForIntThrowsFormatException()
-			throws Exception {
-		new BdfList().getInt(0);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testTooLargeIndexForOptionalIntThrowsFormatException()
-			throws Exception {
-		new BdfList().getOptionalInt(0);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testTooLargeIndexForDefaultIntThrowsFormatException()
-			throws Exception {
-		new BdfList().getInt(0, 1);
-	}
-
 	@Test(expected = FormatException.class)
 	public void testTooLargeIndexForDoubleThrowsFormatException()
 			throws Exception {
@@ -298,12 +239,6 @@ public class BdfListTest extends BrambleTestCase {
 		new BdfList().getOptionalDouble(0);
 	}
 
-	@Test(expected = FormatException.class)
-	public void testTooLargeIndexForDefaultDoubleThrowsFormatException()
-			throws Exception {
-		new BdfList().getDouble(0, 1D);
-	}
-
 	@Test(expected = FormatException.class)
 	public void testTooLargeIndexForStringThrowsFormatException()
 			throws Exception {
@@ -316,12 +251,6 @@ public class BdfListTest extends BrambleTestCase {
 		new BdfList().getOptionalString(0);
 	}
 
-	@Test(expected = FormatException.class)
-	public void testTooLargeIndexForDefaultStringThrowsFormatException()
-			throws Exception {
-		new BdfList().getString(0, "");
-	}
-
 	@Test(expected = FormatException.class)
 	public void testTooLargeIndexForRawThrowsFormatException()
 			throws Exception {
@@ -334,12 +263,6 @@ public class BdfListTest extends BrambleTestCase {
 		new BdfList().getOptionalRaw(0);
 	}
 
-	@Test(expected = FormatException.class)
-	public void testTooLargeIndexForDefaultRawThrowsFormatException()
-			throws Exception {
-		new BdfList().getRaw(0, new byte[0]);
-	}
-
 	@Test(expected = FormatException.class)
 	public void testTooLargeIndexForListThrowsFormatException()
 			throws Exception {
@@ -352,11 +275,6 @@ public class BdfListTest extends BrambleTestCase {
 		new BdfList().getOptionalList(0);
 	}
 
-	@Test(expected = FormatException.class)
-	public void testTooLargeIndexForDefaultListThrowsFormatException()
-			throws Exception {
-		new BdfList().getList(0, new BdfList());
-	}
 
 	@Test(expected = FormatException.class)
 	public void testTooLargeIndexForDictionaryThrowsFormatException()
@@ -369,13 +287,6 @@ public class BdfListTest extends BrambleTestCase {
 			throws Exception {
 		new BdfList().getOptionalDictionary(0);
 	}
-
-	@Test(expected = FormatException.class)
-	public void testTooLargeIndexForDefaultDictionaryThrowsFormatException()
-			throws Exception {
-		new BdfList().getDictionary(0, new BdfDictionary());
-	}
-
 	@Test(expected = FormatException.class)
 	public void testWrongTypeForBooleanThrowsFormatException()
 			throws Exception {
@@ -388,12 +299,6 @@ public class BdfListTest extends BrambleTestCase {
 		BdfList.of(123).getOptionalBoolean(0);
 	}
 
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForDefaultBooleanThrowsFormatException()
-			throws Exception {
-		BdfList.of(123).getBoolean(0, true);
-	}
-
 	@Test(expected = FormatException.class)
 	public void testWrongTypeForLongThrowsFormatException() throws Exception {
 		BdfList.of(1.23).getLong(0);
@@ -405,29 +310,6 @@ public class BdfListTest extends BrambleTestCase {
 		BdfList.of(1.23).getOptionalLong(0);
 	}
 
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForDefaultLongThrowsFormatException()
-			throws Exception {
-		BdfList.of(1.23).getLong(0, 1L);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForIntThrowsFormatException() throws Exception {
-		BdfList.of(1.23).getInt(0);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForOptionalIntThrowsFormatException()
-			throws Exception {
-		BdfList.of(1.23).getOptionalInt(0);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForDefaultIntThrowsFormatException()
-			throws Exception {
-		BdfList.of(1.23).getInt(0, 1);
-	}
-
 	@Test(expected = FormatException.class)
 	public void testWrongTypeForDoubleThrowsFormatException() throws Exception {
 		BdfList.of(123).getDouble(0);
@@ -439,12 +321,6 @@ public class BdfListTest extends BrambleTestCase {
 		BdfList.of(123).getOptionalDouble(0);
 	}
 
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForDefaultDoubleThrowsFormatException()
-			throws Exception {
-		BdfList.of(123).getDouble(0, 1D);
-	}
-
 	@Test(expected = FormatException.class)
 	public void testWrongTypeForStringThrowsFormatException() throws Exception {
 		BdfList.of(123).getString(0);
@@ -456,12 +332,6 @@ public class BdfListTest extends BrambleTestCase {
 		BdfList.of(123).getOptionalString(0);
 	}
 
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForDefaultStringThrowsFormatException()
-			throws Exception {
-		BdfList.of(123).getString(0, "");
-	}
-
 	@Test(expected = FormatException.class)
 	public void testWrongTypeForRawThrowsFormatException() throws Exception {
 		BdfList.of(123).getRaw(0);
@@ -473,12 +343,6 @@ public class BdfListTest extends BrambleTestCase {
 		BdfList.of(123).getOptionalRaw(0);
 	}
 
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForDefaultRawThrowsFormatException()
-			throws Exception {
-		BdfList.of(123).getRaw(0, new byte[0]);
-	}
-
 	@Test(expected = FormatException.class)
 	public void testWrongTypeForListThrowsFormatException() throws Exception {
 		BdfList.of(123).getList(0);
@@ -490,11 +354,6 @@ public class BdfListTest extends BrambleTestCase {
 		BdfList.of(123).getOptionalList(0);
 	}
 
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForDefaultListThrowsFormatException()
-			throws Exception {
-		BdfList.of(123).getList(0, new BdfList());
-	}
 
 	@Test(expected = FormatException.class)
 	public void testWrongTypeForDictionaryThrowsFormatException()
@@ -507,81 +366,4 @@ public class BdfListTest extends BrambleTestCase {
 			throws Exception {
 		BdfList.of(123).getOptionalDictionary(0);
 	}
-
-	@Test(expected = FormatException.class)
-	public void testWrongTypeForDefaultDictionaryThrowsFormatException()
-			throws Exception {
-		BdfList.of(123).getDictionary(0, new BdfDictionary());
-	}
-
-	@Test(expected = FormatException.class)
-	public void testNullValueForBooleanThrowsFormatException()
-			throws Exception {
-		BdfList.of(NULL_VALUE).getBoolean(0);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testNullValueForLongThrowsFormatException() throws Exception {
-		BdfList.of(NULL_VALUE).getLong(0);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testNullValueForIntThrowsFormatException() throws Exception {
-		BdfList.of(NULL_VALUE).getInt(0);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testNullValueForDoubleThrowsFormatException() throws Exception {
-		BdfList.of(NULL_VALUE).getDouble(0);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testNullValueForStringThrowsFormatException() throws Exception {
-		BdfList.of(NULL_VALUE).getString(0);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testNullValueForRawThrowsFormatException() throws Exception {
-		BdfList.of(NULL_VALUE).getRaw(0);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testNullValueForListThrowsFormatException() throws Exception {
-		BdfList.of(NULL_VALUE).getList(0);
-	}
-
-	@Test(expected = FormatException.class)
-	public void testNullValueForDictionaryThrowsFormatException()
-			throws Exception {
-		BdfList.of(NULL_VALUE).getDictionary(0);
-	}
-
-	@Test
-	public void testOptionalMethodsReturnNullForNullValue() throws Exception {
-		BdfList list = BdfList.of(NULL_VALUE);
-		assertNull(list.getOptionalBoolean(0));
-		assertNull(list.getOptionalLong(0));
-		assertNull(list.getOptionalInt(0));
-		assertNull(list.getOptionalDouble(0));
-		assertNull(list.getOptionalString(0));
-		assertNull(list.getOptionalRaw(0));
-		assertNull(list.getOptionalList(0));
-		assertNull(list.getOptionalDictionary(0));
-	}
-
-	@Test
-	public void testDefaultMethodsReturnDefaultForNullValue() throws Exception {
-		BdfList list = BdfList.of(NULL_VALUE);
-		assertEquals(TRUE, list.getBoolean(0, TRUE));
-		assertEquals(Long.valueOf(123L), list.getLong(0, 123L));
-		assertEquals(Integer.valueOf(123), list.getInt(0, 123));
-		assertEquals(Double.valueOf(123D), list.getDouble(0, 123D));
-		assertEquals("123", list.getString(0, "123"));
-		byte[] defaultRaw = {1, 2, 3};
-		assertArrayEquals(defaultRaw, list.getRaw(0, defaultRaw));
-		BdfList defaultList = BdfList.of(1, 2, 3);
-		assertEquals(defaultList, list.getList(0, defaultList));
-		BdfDictionary defaultDict = BdfDictionary.of(new BdfEntry("123", 123));
-		assertEquals(defaultDict, list.getDictionary(0, defaultDict));
-	}
 }

bramble-api/witness.gradle

@@ -1,10 +1,10 @@
 dependencyVerification {
     verify = [
         'cglib:cglib:3.2.8:cglib-3.2.8.jar:3f64de999ecc5595dc84ca8ff0879d8a34c8623f9ef3c517a53ed59023fcb9db',
-        'com.fasterxml.jackson.core:jackson-annotations:2.13.4:jackson-annotations-2.13.4.jar:ac5b27a634942391ca113850ee7db01df1499a240174021263501c05fc653b44',
+        'com.fasterxml.jackson.core:jackson-annotations:2.13.0:jackson-annotations-2.13.0.jar:81f9724d8843e8b08f8f6c0609e7a2b030d00c34861c4ac7e2099a7235047d6f',
         'com.google.code.findbugs:annotations:3.0.1:annotations-3.0.1.jar:6b47ff0a6de0ce17cbedc3abb0828ca5bce3009d53ea47b3723ff023c4742f79',
         'com.google.code.findbugs:jsr305:3.0.2:jsr305-3.0.2.jar:766ad2a0783f2687962c8ad74ceecc38a28b9f72a2d085ee438b7813e928d0c7',
-        'com.google.dagger:dagger:2.45:dagger-2.45.jar:f011cae7d2c0fb7ea17c34e05bc10e768b1081a5892ad019cf1fdb0e125c49c1',
+        'com.google.dagger:dagger:2.33:dagger-2.33.jar:d8798c5b8cf6b125234e33af5c6293bb9f2208ce29b57924c35b8c0be7b6bdcb',
         'javax.inject:javax.inject:1:javax.inject-1.jar:91c77044a50c481636c32d916fd89c9118a72195390452c81065080f957de7ff',
         'junit:junit:4.13.2:junit-4.13.2.jar:8e495b634469d64fb8acfa3495a065cbacc8a0fff55ce1e31007be4c16dc57d3',
         'net.bytebuddy:byte-buddy:1.9.12:byte-buddy-1.9.12.jar:3688c3d434bebc3edc5516296a2ed0f47b65e451071b4afecad84f902f0efc11',
@@ -12,8 +12,8 @@ dependencyVerification {
         'org.apache-extras.beanshell:bsh:2.0b6:bsh-2.0b6.jar:a17955976070c0573235ee662f2794a78082758b61accffce8d3f8aedcd91047',
         'org.briarproject:null-safety:0.1:null-safety-0.1.jar:161760de5e838cb982bafa973df820675d4397098e9a91637a36a306d43ba011',
         'org.codehaus.mojo.signature:java16:1.1:java16-1.1.signature:53799223a2c98dba2d0add810bed76315460df285c69e4f397ae6098f87dd619',
-        'org.codehaus.mojo:animal-sniffer-ant-tasks:1.22:animal-sniffer-ant-tasks-1.22.jar:3f6afeb3e09301d2d7179ed1db21e3ad8846c1e38415ad832a395138ae3f4218',
-        'org.codehaus.mojo:animal-sniffer:1.22:animal-sniffer-1.22.jar:f18c11a25bdd8b520b9c6a28cbb6f33007c812ab0051b6be3f0778e660aa501c',
+        'org.codehaus.mojo:animal-sniffer-ant-tasks:1.20:animal-sniffer-ant-tasks-1.20.jar:bb7d2498144118311d968bb08ff6fae3fc535fb1cb9cca8b8e9ea65b189422ac',
+        'org.codehaus.mojo:animal-sniffer:1.20:animal-sniffer-1.20.jar:80c422523c38db91260c6d78e5ee4b012862ab61cc55020c9e243dd7b5c62249',
         'org.hamcrest:hamcrest-core:2.1:hamcrest-core-2.1.jar:e09109e54a289d88506b9bfec987ddd199f4217c9464132668351b9a4f00bee9',
         'org.hamcrest:hamcrest-library:2.1:hamcrest-library-2.1.jar:b7e2b6895b3b679f0e47b6380fda391b225e9b78505db9d8bdde8d3cc8d52a21',
         'org.hamcrest:hamcrest:2.1:hamcrest-2.1.jar:ba93b2e3a562322ba432f0a1b53addcc55cb188253319a020ed77f824e692050',
@@ -24,6 +24,6 @@ dependencyVerification {
         'org.jmock:jmock:2.12.0:jmock-2.12.0.jar:266d07314c0cd343c46ff8a55601272de8cf406807caf55e6f313295f83d10be',
         'org.objenesis:objenesis:3.0.1:objenesis-3.0.1.jar:7a8ff780b9ff48415d7c705f60030b0acaa616e7f823c98eede3b63508d4e984',
         'org.ow2.asm:asm:7.1:asm-7.1.jar:4ab2fa2b6d2cc9ccb1eaa05ea329c407b47b13ed2915f62f8c4b8cc96258d4de',
-        'org.ow2.asm:asm:9.3:asm-9.3.jar:1263369b59e29c943918de11d6d6152e2ec6085ce63e5710516f8c67d368e4bc',
+        'org.ow2.asm:asm:9.1:asm-9.1.jar:cda4de455fab48ff0bcb7c48b4639447d4de859a7afc30a094a986f0936beba2',
     ]
 }

bramble-core/build.gradle

@@ -9,31 +9,30 @@ apply from: 'witness.gradle'
 apply from: '../dagger.gradle'
 
 dependencies {
-	api project(':bramble-api')
-
-	api "org.briarproject:onionwrapper-core:$onionwrapper_version"
-
-	implementation "org.bouncycastle:bcprov-jdk15to18:$bouncy_castle_version"
+	implementation project(path: ':bramble-api', configuration: 'default')
+	implementation 'org.bouncycastle:bcprov-jdk15to18:1.70'
 	//noinspection GradleDependency
 	implementation 'com.h2database:h2:1.4.192' // The last version that supports Java 1.6
 	implementation 'org.bitlet:weupnp:0.1.4'
 	implementation 'net.i2p.crypto:eddsa:0.2.0'
 	implementation 'org.whispersystems:curve25519-java:0.5.0'
+	implementation 'org.briarproject:jtorctl:0.5'
 	implementation 'org.briarproject:socks-socket:0.1'
+
+	//noinspection GradleDependency
 	implementation "com.squareup.okhttp3:okhttp:$okhttp_version"
 	implementation "com.fasterxml.jackson.core:jackson-databind:$jackson_version"
 
 	annotationProcessor "com.google.dagger:dagger-compiler:$dagger_version"
 
 	testImplementation project(path: ':bramble-api', configuration: 'testOutput')
-
 	testImplementation 'org.hsqldb:hsqldb:2.3.5' // The last version that supports Java 1.6
-	testImplementation 'net.jodah:concurrentunit:0.4.6'
+	testImplementation 'net.jodah:concurrentunit:0.4.2'
 	testImplementation "junit:junit:$junit_version"
 	testImplementation "org.jmock:jmock:$jmock_version"
 	testImplementation "org.jmock:jmock-junit4:$jmock_version"
 	testImplementation "org.jmock:jmock-imposters:$jmock_version"
-	testImplementation "com.squareup.okhttp3:mockwebserver:$mockwebserver_version"
+	testImplementation "com.squareup.okhttp3:mockwebserver:4.9.3"
 
 	testAnnotationProcessor "com.google.dagger:dagger-compiler:$dagger_version"
 
@@ -53,7 +52,7 @@ configurations {
 	testOutput.extendsFrom(testCompile)
 }
 task jarTest(type: Jar, dependsOn: testClasses) {
-	from sourceSets.test.output, sourceSets.main.output
+	from sourceSets.test.output
 	classifier = 'test'
 }
 artifacts {

bramble-core/src/main/java/org/briarproject/bramble/BrambleCoreModule.java

@@ -17,7 +17,6 @@ import org.briarproject.bramble.lifecycle.LifecycleModule;
 import org.briarproject.bramble.mailbox.MailboxModule;
 import org.briarproject.bramble.plugin.PluginModule;
 import org.briarproject.bramble.properties.PropertiesModule;
-import org.briarproject.bramble.qrcode.QrCodeModule;
 import org.briarproject.bramble.record.RecordModule;
 import org.briarproject.bramble.reliability.ReliabilityModule;
 import org.briarproject.bramble.rendezvous.RendezvousModule;
@@ -48,7 +47,6 @@ import dagger.Module;
 		MailboxModule.class,
 		PluginModule.class,
 		PropertiesModule.class,
-		QrCodeModule.class,
 		RecordModule.class,
 		ReliabilityModule.class,
 		RendezvousModule.class,

bramble-core/src/main/java/org/briarproject/bramble/TimeLoggingExecutor.java

@@ -4,7 +4,6 @@ import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.util.concurrent.BlockingQueue;
 import java.util.concurrent.RejectedExecutionHandler;
-import java.util.concurrent.ThreadFactory;
 import java.util.concurrent.ThreadPoolExecutor;
 import java.util.concurrent.TimeUnit;
 import java.util.logging.Logger;
@@ -20,10 +19,9 @@ public class TimeLoggingExecutor extends ThreadPoolExecutor {
 	public TimeLoggingExecutor(String tag, int corePoolSize, int maxPoolSize,
 			long keepAliveTime, TimeUnit unit,
 			BlockingQueue<Runnable> workQueue,
-			ThreadFactory threadFactory,
 			RejectedExecutionHandler handler) {
 		super(corePoolSize, maxPoolSize, keepAliveTime, unit, workQueue,
-				threadFactory, handler);
+				handler);
 		log = Logger.getLogger(tag);
 	}
 

bramble-core/src/main/java/org/briarproject/bramble/account/AccountManagerImpl.java

@@ -19,6 +19,7 @@ import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStreamReader;
+import java.nio.charset.Charset;
 import java.util.logging.Logger;
 
 import javax.annotation.Nullable;
@@ -28,7 +29,6 @@ import javax.inject.Inject;
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.api.crypto.DecryptionResult.INVALID_CIPHERTEXT;
 import static org.briarproject.bramble.util.LogUtils.logException;
-import static org.briarproject.bramble.util.StringUtils.UTF_8;
 import static org.briarproject.bramble.util.StringUtils.fromHexString;
 import static org.briarproject.bramble.util.StringUtils.toHexString;
 
@@ -99,7 +99,7 @@ class AccountManagerImpl implements AccountManager {
 		}
 		try {
 			BufferedReader reader = new BufferedReader(new InputStreamReader(
-					new FileInputStream(f), UTF_8));
+					new FileInputStream(f), Charset.forName("UTF-8")));
 			String key = reader.readLine();
 			reader.close();
 			return key;
@@ -151,7 +151,7 @@ class AccountManagerImpl implements AccountManager {
 	@GuardedBy("stateChangeLock")
 	private void writeDbKeyToFile(String key, File f) throws IOException {
 		FileOutputStream out = new FileOutputStream(f);
-		out.write(key.getBytes(UTF_8));
+		out.write(key.getBytes(Charset.forName("UTF-8")));
 		out.flush();
 		out.close();
 	}

bramble-core/src/main/java/org/briarproject/bramble/client/ClientHelperImpl.java

@@ -155,13 +155,7 @@ class ClientHelperImpl implements ClientHelper {
 	@Override
 	public BdfList getMessageAsList(Transaction txn, MessageId m)
 			throws DbException, FormatException {
-		return getMessageAsList(txn, m, true);
-	}
-
-	@Override
-	public BdfList getMessageAsList(Transaction txn, MessageId m,
-			boolean canonical) throws DbException, FormatException {
-		return toList(db.getMessage(txn, m), canonical);
+		return toList(db.getMessage(txn, m).getBody());
 	}
 
 	@Override
@@ -319,13 +313,8 @@ class ClientHelperImpl implements ClientHelper {
 
 	@Override
 	public BdfList toList(byte[] b, int off, int len) throws FormatException {
-		return toList(b, off, len, true);
-	}
-
-	private BdfList toList(byte[] b, int off, int len, boolean canonical)
-			throws FormatException {
 		ByteArrayInputStream in = new ByteArrayInputStream(b, off, len);
-		BdfReader reader = bdfReaderFactory.createReader(in, canonical);
+		BdfReader reader = bdfReaderFactory.createReader(in);
 		try {
 			BdfList list = reader.readList();
 			if (!reader.eof()) throw new FormatException();
@@ -339,7 +328,7 @@ class ClientHelperImpl implements ClientHelper {
 
 	@Override
 	public BdfList toList(byte[] b) throws FormatException {
-		return toList(b, 0, b.length, true);
+		return toList(b, 0, b.length);
 	}
 
 	@Override
@@ -347,12 +336,6 @@ class ClientHelperImpl implements ClientHelper {
 		return toList(m.getBody());
 	}
 
-	@Override
-	public BdfList toList(Message m, boolean canonical) throws FormatException {
-		byte[] b = m.getBody();
-		return toList(b, 0, b.length, canonical);
-	}
-
 	@Override
 	public BdfList toList(Author a) {
 		return BdfList.of(a.getFormatVersion(), a.getName(), a.getPublicKey());
@@ -378,7 +361,7 @@ class ClientHelperImpl implements ClientHelper {
 	public Author parseAndValidateAuthor(BdfList author)
 			throws FormatException {
 		checkSize(author, 3);
-		int formatVersion = author.getInt(0);
+		int formatVersion = author.getLong(0).intValue();
 		if (formatVersion != FORMAT_VERSION) throw new FormatException();
 		String name = author.getString(1);
 		checkLength(name, 1, MAX_AUTHOR_NAME_LENGTH);
@@ -489,7 +472,8 @@ class ClientHelperImpl implements ClientHelper {
 			if (element.size() != 2) {
 				throw new FormatException();
 			}
-			list.add(new MailboxVersion(element.getInt(0), element.getInt(1)));
+			list.add(new MailboxVersion(element.getLong(0).intValue(),
+					element.getLong(1).intValue()));
 		}
 		// Sort the list of versions for easier comparison
 		sort(list);
@@ -502,7 +486,7 @@ class ClientHelperImpl implements ClientHelper {
 		try {
 			BdfDictionary meta =
 					getGroupMetadataAsDictionary(txn, contactGroupId);
-			return new ContactId(meta.getInt(GROUP_KEY_CONTACT_ID));
+			return new ContactId(meta.getLong(GROUP_KEY_CONTACT_ID).intValue());
 		} catch (FormatException e) {
 			throw new DbException(e); // Invalid group metadata
 		}

bramble-core/src/main/java/org/briarproject/bramble/contact/ContactExchangeManagerImpl.java

@@ -1,6 +1,7 @@
 package org.briarproject.bramble.contact;
 
 import org.briarproject.bramble.api.FormatException;
+import org.briarproject.bramble.api.Predicate;
 import org.briarproject.bramble.api.client.ClientHelper;
 import org.briarproject.bramble.api.contact.Contact;
 import org.briarproject.bramble.api.contact.ContactExchangeManager;
@@ -23,7 +24,6 @@ import org.briarproject.bramble.api.properties.TransportProperties;
 import org.briarproject.bramble.api.properties.TransportPropertyManager;
 import org.briarproject.bramble.api.record.Record;
 import org.briarproject.bramble.api.record.RecordReader;
-import org.briarproject.bramble.api.record.RecordReader.RecordPredicate;
 import org.briarproject.bramble.api.record.RecordReaderFactory;
 import org.briarproject.bramble.api.record.RecordWriter;
 import org.briarproject.bramble.api.record.RecordWriterFactory;
@@ -61,12 +61,12 @@ class ContactExchangeManagerImpl implements ContactExchangeManager {
 			getLogger(ContactExchangeManagerImpl.class.getName());
 
 	// Accept records with current protocol version, known record type
-	private static final RecordPredicate ACCEPT = r ->
+	private static final Predicate<Record> ACCEPT = r ->
 			r.getProtocolVersion() == PROTOCOL_VERSION &&
 					isKnownRecordType(r.getRecordType());
 
 	// Ignore records with current protocol version, unknown record type
-	private static final RecordPredicate IGNORE = r ->
+	private static final Predicate<Record> IGNORE = r ->
 			r.getProtocolVersion() == PROTOCOL_VERSION &&
 					!isKnownRecordType(r.getRecordType());
 

bramble-core/src/main/java/org/briarproject/bramble/contact/HandshakeConstants.java

@@ -5,31 +5,14 @@ import static org.briarproject.bramble.api.crypto.CryptoConstants.MAC_BYTES;
 interface HandshakeConstants {
 
 	/**
-	 * The current major version of the handshake protocol.
+	 * The current version of the handshake protocol.
 	 */
-	byte PROTOCOL_MAJOR_VERSION = 0;
+	byte PROTOCOL_VERSION = 0;
 
 	/**
-	 * The current minor version of the handshake protocol.
+	 * Label for deriving the master key.
 	 */
-	byte PROTOCOL_MINOR_VERSION = 1;
-
-	/**
-	 * Label for deriving the master key when using the deprecated v0.0 key
-	 * derivation method.
-	 * <p>
-	 * TODO: Remove this after a reasonable migration period (added 2023-03-10).
-	 */
-	@Deprecated
-	String MASTER_KEY_LABEL_0_0 =
-			"org.briarproject.bramble.handshake/MASTER_KEY";
-
-	/**
-	 * Label for deriving the master key when using the v0.1 key derivation
-	 * method.
-	 */
-	String MASTER_KEY_LABEL_0_1 =
-			"org.briarproject.bramble.handshake/MASTER_KEY_0_1";
+	String MASTER_KEY_LABEL = "org.briarproject.bramble.handshake/MASTER_KEY";
 
 	/**
 	 * Label for deriving Alice's proof of ownership from the master key.

bramble-core/src/main/java/org/briarproject/bramble/contact/HandshakeCrypto.java

@@ -13,26 +13,11 @@ interface HandshakeCrypto {
 	KeyPair generateEphemeralKeyPair();
 
 	/**
-	 * Derives the master key from the given static and ephemeral keys using
-	 * the deprecated v0.0 key derivation method.
-	 * <p>
-	 * TODO: Remove this after a reasonable migration period (added 2023-03-10).
+	 * Derives the master key from the given static and ephemeral keys.
 	 *
 	 * @param alice Whether the local peer is Alice
 	 */
-	@Deprecated
-	SecretKey deriveMasterKey_0_0(PublicKey theirStaticPublicKey,
-			PublicKey theirEphemeralPublicKey, KeyPair ourStaticKeyPair,
-			KeyPair ourEphemeralKeyPair, boolean alice)
-			throws GeneralSecurityException;
-
-	/**
-	 * Derives the master key from the given static and ephemeral keys using
-	 * the v0.1 key derivation method.
-	 *
-	 * @param alice Whether the local peer is Alice
-	 */
-	SecretKey deriveMasterKey_0_1(PublicKey theirStaticPublicKey,
+	SecretKey deriveMasterKey(PublicKey theirStaticPublicKey,
 			PublicKey theirEphemeralPublicKey, KeyPair ourStaticKeyPair,
 			KeyPair ourEphemeralKeyPair, boolean alice)
 			throws GeneralSecurityException;

bramble-core/src/main/java/org/briarproject/bramble/contact/HandshakeCryptoImpl.java

@@ -13,8 +13,7 @@ import javax.inject.Inject;
 
 import static org.briarproject.bramble.contact.HandshakeConstants.ALICE_PROOF_LABEL;
 import static org.briarproject.bramble.contact.HandshakeConstants.BOB_PROOF_LABEL;
-import static org.briarproject.bramble.contact.HandshakeConstants.MASTER_KEY_LABEL_0_0;
-import static org.briarproject.bramble.contact.HandshakeConstants.MASTER_KEY_LABEL_0_1;
+import static org.briarproject.bramble.contact.HandshakeConstants.MASTER_KEY_LABEL;
 
 @Immutable
 @NotNullByDefault
@@ -33,8 +32,7 @@ class HandshakeCryptoImpl implements HandshakeCrypto {
 	}
 
 	@Override
-	@Deprecated
-	public SecretKey deriveMasterKey_0_0(PublicKey theirStaticPublicKey,
+	public SecretKey deriveMasterKey(PublicKey theirStaticPublicKey,
 			PublicKey theirEphemeralPublicKey, KeyPair ourStaticKeyPair,
 			KeyPair ourEphemeralKeyPair, boolean alice) throws
 			GeneralSecurityException {
@@ -48,29 +46,9 @@ class HandshakeCryptoImpl implements HandshakeCrypto {
 				alice ? ourEphemeral : theirEphemeral,
 				alice ? theirEphemeral : ourEphemeral
 		};
-		return crypto.deriveSharedSecretBadly(MASTER_KEY_LABEL_0_0,
-				theirStaticPublicKey, theirEphemeralPublicKey,
-				ourStaticKeyPair, ourEphemeralKeyPair, alice, inputs);
-	}
-
-	@Override
-	public SecretKey deriveMasterKey_0_1(PublicKey theirStaticPublicKey,
-			PublicKey theirEphemeralPublicKey, KeyPair ourStaticKeyPair,
-			KeyPair ourEphemeralKeyPair, boolean alice) throws
-			GeneralSecurityException {
-		byte[] theirStatic = theirStaticPublicKey.getEncoded();
-		byte[] theirEphemeral = theirEphemeralPublicKey.getEncoded();
-		byte[] ourStatic = ourStaticKeyPair.getPublic().getEncoded();
-		byte[] ourEphemeral = ourEphemeralKeyPair.getPublic().getEncoded();
-		byte[][] inputs = {
-				alice ? ourStatic : theirStatic,
-				alice ? theirStatic : ourStatic,
-				alice ? ourEphemeral : theirEphemeral,
-				alice ? theirEphemeral : ourEphemeral
-		};
-		return crypto.deriveSharedSecret(MASTER_KEY_LABEL_0_1,
-				theirStaticPublicKey, theirEphemeralPublicKey,
-				ourStaticKeyPair, ourEphemeralKeyPair, alice, inputs);
+		return crypto.deriveSharedSecret(MASTER_KEY_LABEL, theirStaticPublicKey,
+				theirEphemeralPublicKey, ourStaticKeyPair, ourEphemeralKeyPair,
+				alice, inputs);
 	}
 
 	@Override

bramble-core/src/main/java/org/briarproject/bramble/contact/HandshakeManagerImpl.java

@@ -2,6 +2,7 @@ package org.briarproject.bramble.contact;
 
 import org.briarproject.bramble.api.FormatException;
 import org.briarproject.bramble.api.Pair;
+import org.briarproject.bramble.api.Predicate;
 import org.briarproject.bramble.api.contact.ContactManager;
 import org.briarproject.bramble.api.contact.HandshakeManager;
 import org.briarproject.bramble.api.contact.PendingContact;
@@ -11,12 +12,12 @@ import org.briarproject.bramble.api.crypto.KeyPair;
 import org.briarproject.bramble.api.crypto.PublicKey;
 import org.briarproject.bramble.api.crypto.SecretKey;
 import org.briarproject.bramble.api.crypto.TransportCrypto;
+import org.briarproject.bramble.api.db.DatabaseComponent;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.db.TransactionManager;
 import org.briarproject.bramble.api.identity.IdentityManager;
 import org.briarproject.bramble.api.record.Record;
 import org.briarproject.bramble.api.record.RecordReader;
-import org.briarproject.bramble.api.record.RecordReader.RecordPredicate;
 import org.briarproject.bramble.api.record.RecordReaderFactory;
 import org.briarproject.bramble.api.record.RecordWriter;
 import org.briarproject.bramble.api.record.RecordWriterFactory;
@@ -27,20 +28,15 @@ import java.io.EOFException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.security.GeneralSecurityException;
-import java.util.List;
 
 import javax.annotation.concurrent.Immutable;
 import javax.inject.Inject;
 
-import static java.util.Arrays.asList;
-import static java.util.Collections.singletonList;
 import static org.briarproject.bramble.api.crypto.CryptoConstants.MAX_AGREEMENT_PUBLIC_KEY_BYTES;
 import static org.briarproject.bramble.contact.HandshakeConstants.PROOF_BYTES;
-import static org.briarproject.bramble.contact.HandshakeConstants.PROTOCOL_MAJOR_VERSION;
-import static org.briarproject.bramble.contact.HandshakeConstants.PROTOCOL_MINOR_VERSION;
-import static org.briarproject.bramble.contact.HandshakeRecordTypes.RECORD_TYPE_EPHEMERAL_PUBLIC_KEY;
-import static org.briarproject.bramble.contact.HandshakeRecordTypes.RECORD_TYPE_MINOR_VERSION;
-import static org.briarproject.bramble.contact.HandshakeRecordTypes.RECORD_TYPE_PROOF_OF_OWNERSHIP;
+import static org.briarproject.bramble.contact.HandshakeConstants.PROTOCOL_VERSION;
+import static org.briarproject.bramble.contact.HandshakeRecordTypes.EPHEMERAL_PUBLIC_KEY;
+import static org.briarproject.bramble.contact.HandshakeRecordTypes.PROOF_OF_OWNERSHIP;
 import static org.briarproject.bramble.util.ValidationUtils.checkLength;
 
 @Immutable
@@ -48,14 +44,12 @@ import static org.briarproject.bramble.util.ValidationUtils.checkLength;
 class HandshakeManagerImpl implements HandshakeManager {
 
 	// Ignore records with current protocol version, unknown record type
-	private static final RecordPredicate IGNORE = r ->
-			r.getProtocolVersion() == PROTOCOL_MAJOR_VERSION &&
+	private static final Predicate<Record> IGNORE = r ->
+			r.getProtocolVersion() == PROTOCOL_VERSION &&
 					!isKnownRecordType(r.getRecordType());
 
 	private static boolean isKnownRecordType(byte type) {
-		return type == RECORD_TYPE_EPHEMERAL_PUBLIC_KEY ||
-				type == RECORD_TYPE_PROOF_OF_OWNERSHIP ||
-				type == RECORD_TYPE_MINOR_VERSION;
+		return type == EPHEMERAL_PUBLIC_KEY || type == PROOF_OF_OWNERSHIP;
 	}
 
 	private final TransactionManager db;
@@ -67,7 +61,7 @@ class HandshakeManagerImpl implements HandshakeManager {
 	private final RecordWriterFactory recordWriterFactory;
 
 	@Inject
-	HandshakeManagerImpl(TransactionManager db,
+	HandshakeManagerImpl(DatabaseComponent db,
 			IdentityManager identityManager,
 			ContactManager contactManager,
 			TransportCrypto transportCrypto,
@@ -101,31 +95,19 @@ class HandshakeManagerImpl implements HandshakeManager {
 				.createRecordWriter(out.getOutputStream());
 		KeyPair ourEphemeralKeyPair =
 				handshakeCrypto.generateEphemeralKeyPair();
-		Pair<Byte, PublicKey> theirMinorVersionAndKey;
+		PublicKey theirEphemeralPublicKey;
 		if (alice) {
-			sendMinorVersion(recordWriter);
 			sendPublicKey(recordWriter, ourEphemeralKeyPair.getPublic());
-			theirMinorVersionAndKey = receiveMinorVersionAndKey(recordReader);
+			theirEphemeralPublicKey = receivePublicKey(recordReader);
 		} else {
-			theirMinorVersionAndKey = receiveMinorVersionAndKey(recordReader);
-			sendMinorVersion(recordWriter);
+			theirEphemeralPublicKey = receivePublicKey(recordReader);
 			sendPublicKey(recordWriter, ourEphemeralKeyPair.getPublic());
 		}
-		byte theirMinorVersion = theirMinorVersionAndKey.getFirst();
-		PublicKey theirEphemeralPublicKey = theirMinorVersionAndKey.getSecond();
 		SecretKey masterKey;
 		try {
-			if (theirMinorVersion > 0) {
-				masterKey = handshakeCrypto.deriveMasterKey_0_1(
-						theirStaticPublicKey, theirEphemeralPublicKey,
-						ourStaticKeyPair, ourEphemeralKeyPair, alice);
-			} else {
-				// TODO: Remove this branch after a reasonable migration
-				//  period (added 2023-03-10).
-				masterKey = handshakeCrypto.deriveMasterKey_0_0(
-						theirStaticPublicKey, theirEphemeralPublicKey,
-						ourStaticKeyPair, ourEphemeralKeyPair, alice);
-			}
+			masterKey = handshakeCrypto.deriveMasterKey(theirStaticPublicKey,
+					theirEphemeralPublicKey, ourStaticKeyPair,
+					ourEphemeralKeyPair, alice);
 		} catch (GeneralSecurityException e) {
 			throw new FormatException();
 		}
@@ -146,91 +128,34 @@ class HandshakeManagerImpl implements HandshakeManager {
 	}
 
 	private void sendPublicKey(RecordWriter w, PublicKey k) throws IOException {
-		w.writeRecord(new Record(PROTOCOL_MAJOR_VERSION,
-				RECORD_TYPE_EPHEMERAL_PUBLIC_KEY, k.getEncoded()));
+		w.writeRecord(new Record(PROTOCOL_VERSION, EPHEMERAL_PUBLIC_KEY,
+				k.getEncoded()));
 		w.flush();
 	}
 
-	/**
-	 * Receives the remote peer's protocol minor version and ephemeral public
-	 * key.
-	 * <p>
-	 * In version 0.1 of the protocol, each peer sends a minor version record
-	 * followed by an ephemeral public key record.
-	 * <p>
-	 * In version 0.0 of the protocol, each peer sends an ephemeral public key
-	 * record without a preceding minor version record.
-	 * <p>
-	 * Therefore the remote peer's minor version must be non-zero if a minor
-	 * version record is received, and is assumed to be zero if no minor
-	 * version record is received.
-	 */
-	private Pair<Byte, PublicKey> receiveMinorVersionAndKey(RecordReader r)
-			throws IOException {
-		byte theirMinorVersion;
-		PublicKey theirEphemeralPublicKey;
-		// The first record can be either a minor version record or an
-		// ephemeral public key record
-		Record first = readRecord(r, asList(RECORD_TYPE_MINOR_VERSION,
-				RECORD_TYPE_EPHEMERAL_PUBLIC_KEY));
-		if (first.getRecordType() == RECORD_TYPE_MINOR_VERSION) {
-			// The payload must be a single byte giving the remote peer's
-			// protocol minor version, which must be non-zero
-			byte[] payload = first.getPayload();
-			checkLength(payload, 1);
-			theirMinorVersion = payload[0];
-			if (theirMinorVersion == 0) throw new FormatException();
-			// The second record must be an ephemeral public key record
-			Record second = readRecord(r,
-					singletonList(RECORD_TYPE_EPHEMERAL_PUBLIC_KEY));
-			theirEphemeralPublicKey = parsePublicKey(second);
-		} else {
-			// The remote peer did not send a minor version record, so the
-			// remote peer's protocol minor version is assumed to be zero
-			// TODO: Remove this branch after a reasonable migration period
-			//  (added 2023-03-10).
-			theirMinorVersion = 0;
-			theirEphemeralPublicKey = parsePublicKey(first);
-		}
-		return new Pair<>(theirMinorVersion, theirEphemeralPublicKey);
-	}
-
-	private PublicKey parsePublicKey(Record rec) throws IOException {
-		if (rec.getRecordType() != RECORD_TYPE_EPHEMERAL_PUBLIC_KEY) {
-			throw new AssertionError();
-		}
-		byte[] key = rec.getPayload();
+	private PublicKey receivePublicKey(RecordReader r) throws IOException {
+		byte[] key = readRecord(r, EPHEMERAL_PUBLIC_KEY).getPayload();
 		checkLength(key, 1, MAX_AGREEMENT_PUBLIC_KEY_BYTES);
 		return new AgreementPublicKey(key);
 	}
 
 	private void sendProof(RecordWriter w, byte[] proof) throws IOException {
-		w.writeRecord(new Record(PROTOCOL_MAJOR_VERSION,
-				RECORD_TYPE_PROOF_OF_OWNERSHIP, proof));
+		w.writeRecord(new Record(PROTOCOL_VERSION, PROOF_OF_OWNERSHIP, proof));
 		w.flush();
 	}
 
 	private byte[] receiveProof(RecordReader r) throws IOException {
-		Record rec = readRecord(r,
-				singletonList(RECORD_TYPE_PROOF_OF_OWNERSHIP));
-		byte[] proof = rec.getPayload();
+		byte[] proof = readRecord(r, PROOF_OF_OWNERSHIP).getPayload();
 		checkLength(proof, PROOF_BYTES, PROOF_BYTES);
 		return proof;
 	}
 
-	private void sendMinorVersion(RecordWriter w) throws IOException {
-		w.writeRecord(new Record(PROTOCOL_MAJOR_VERSION,
-				RECORD_TYPE_MINOR_VERSION,
-				new byte[] {PROTOCOL_MINOR_VERSION}));
-		w.flush();
-	}
-
-	private Record readRecord(RecordReader r, List<Byte> expectedTypes)
+	private Record readRecord(RecordReader r, byte expectedType)
 			throws IOException {
-		// Accept records with current protocol version, expected types only
-		RecordPredicate accept = rec ->
-				rec.getProtocolVersion() == PROTOCOL_MAJOR_VERSION &&
-						expectedTypes.contains(rec.getRecordType());
+		// Accept records with current protocol version, expected type only
+		Predicate<Record> accept = rec ->
+				rec.getProtocolVersion() == PROTOCOL_VERSION &&
+						rec.getRecordType() == expectedType;
 		Record rec = r.readRecord(accept, IGNORE);
 		if (rec == null) throw new EOFException();
 		return rec;

bramble-core/src/main/java/org/briarproject/bramble/contact/HandshakeRecordTypes.java

@@ -5,9 +5,7 @@ package org.briarproject.bramble.contact;
  */
 interface HandshakeRecordTypes {
 
-	byte RECORD_TYPE_EPHEMERAL_PUBLIC_KEY = 0;
+	byte EPHEMERAL_PUBLIC_KEY = 0;
 
-	byte RECORD_TYPE_PROOF_OF_OWNERSHIP = 1;
-
-	byte RECORD_TYPE_MINOR_VERSION = 2;
+	byte PROOF_OF_OWNERSHIP = 1;
 }

bramble-core/src/main/java/org/briarproject/bramble/crypto/CryptoComponentImpl.java

@@ -29,12 +29,12 @@ import org.briarproject.nullsafety.NotNullByDefault;
 import org.whispersystems.curve25519.Curve25519;
 import org.whispersystems.curve25519.Curve25519KeyPair;
 
+import java.nio.charset.Charset;
 import java.security.GeneralSecurityException;
 import java.security.NoSuchAlgorithmException;
 import java.security.Provider;
 import java.security.SecureRandom;
 import java.security.Security;
-import java.util.Locale;
 import java.util.logging.Logger;
 
 import javax.annotation.Nullable;
@@ -51,7 +51,6 @@ import static org.briarproject.bramble.api.crypto.DecryptionResult.KEY_STRENGTHE
 import static org.briarproject.bramble.util.ByteUtils.INT_32_BYTES;
 import static org.briarproject.bramble.util.LogUtils.logDuration;
 import static org.briarproject.bramble.util.LogUtils.now;
-import static org.briarproject.bramble.util.StringUtils.US_ASCII;
 
 @NotNullByDefault
 class CryptoComponentImpl implements CryptoComponent {
@@ -223,8 +222,7 @@ class CryptoComponentImpl implements CryptoComponent {
 	}
 
 	@Override
-	@Deprecated
-	public SecretKey deriveSharedSecretBadly(String label,
+	public SecretKey deriveSharedSecret(String label,
 			PublicKey theirStaticPublicKey, PublicKey theirEphemeralPublicKey,
 			KeyPair ourStaticKeyPair, KeyPair ourEphemeralKeyPair,
 			boolean alice, byte[]... inputs) throws GeneralSecurityException {
@@ -252,35 +250,6 @@ class CryptoComponentImpl implements CryptoComponent {
 		return new SecretKey(hash);
 	}
 
-	@Override
-	public SecretKey deriveSharedSecret(String label,
-			PublicKey theirStaticPublicKey, PublicKey theirEphemeralPublicKey,
-			KeyPair ourStaticKeyPair, KeyPair ourEphemeralKeyPair,
-			boolean alice, byte[]... inputs) throws GeneralSecurityException {
-		PrivateKey ourStaticPrivateKey = ourStaticKeyPair.getPrivate();
-		PrivateKey ourEphemeralPrivateKey = ourEphemeralKeyPair.getPrivate();
-		byte[][] hashInputs = new byte[inputs.length + 3][];
-		// Alice ephemeral/Bob ephemeral
-		hashInputs[0] = performRawKeyAgreement(ourEphemeralPrivateKey,
-				theirEphemeralPublicKey);
-		// Alice static/Bob ephemeral, Bob static/Alice ephemeral
-		if (alice) {
-			hashInputs[1] = performRawKeyAgreement(ourStaticPrivateKey,
-					theirEphemeralPublicKey);
-			hashInputs[2] = performRawKeyAgreement(ourEphemeralPrivateKey,
-					theirStaticPublicKey);
-		} else {
-			hashInputs[1] = performRawKeyAgreement(ourEphemeralPrivateKey,
-					theirStaticPublicKey);
-			hashInputs[2] = performRawKeyAgreement(ourStaticPrivateKey,
-					theirEphemeralPublicKey);
-		}
-		arraycopy(inputs, 0, hashInputs, 3, inputs.length);
-		byte[] hash = hash(label, hashInputs);
-		if (hash.length != SecretKey.LENGTH) throw new IllegalStateException();
-		return new SecretKey(hash);
-	}
-
 	@Override
 	public byte[] sign(String label, byte[] toSign, PrivateKey privateKey)
 			throws GeneralSecurityException {
@@ -491,7 +460,7 @@ class CryptoComponentImpl implements CryptoComponent {
 	@Override
 	public String encodeOnion(byte[] publicKey) {
 		Digest digest = new SHA3Digest(256);
-		byte[] label = ".onion checksum".getBytes(US_ASCII);
+		byte[] label = ".onion checksum".getBytes(Charset.forName("US-ASCII"));
 		digest.update(label, 0, label.length);
 		digest.update(publicKey, 0, publicKey.length);
 		digest.update(ONION_HS_PROTOCOL_VERSION);
@@ -501,7 +470,7 @@ class CryptoComponentImpl implements CryptoComponent {
 		arraycopy(publicKey, 0, address, 0, publicKey.length);
 		arraycopy(checksum, 0, address, publicKey.length, ONION_CHECKSUM_BYTES);
 		address[address.length - 1] = ONION_HS_PROTOCOL_VERSION;
-		return Base32.encode(address).toLowerCase(Locale.US);
+		return Base32.encode(address).toLowerCase();
 	}
 
 }

bramble-core/src/main/java/org/briarproject/bramble/crypto/CryptoExecutorModule.java

@@ -9,7 +9,6 @@ import java.util.concurrent.Executor;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.LinkedBlockingQueue;
 import java.util.concurrent.RejectedExecutionHandler;
-import java.util.concurrent.ThreadFactory;
 import java.util.concurrent.ThreadPoolExecutor;
 
 import javax.inject.Inject;
@@ -38,31 +37,31 @@ public class CryptoExecutorModule {
 	private static final int MAX_EXECUTOR_THREADS =
 			Math.max(1, Runtime.getRuntime().availableProcessors() - 1);
 
-	public CryptoExecutorModule() {
-	}
+	private final ExecutorService cryptoExecutor;
 
-	@Provides
-	@Singleton
-	@CryptoExecutor
-	ExecutorService provideCryptoExecutorService(
-			LifecycleManager lifecycleManager, ThreadFactory threadFactory) {
+	public CryptoExecutorModule() {
 		// Use an unbounded queue
 		BlockingQueue<Runnable> queue = new LinkedBlockingQueue<>();
 		// Discard tasks that are submitted during shutdown
 		RejectedExecutionHandler policy =
 				new ThreadPoolExecutor.DiscardPolicy();
 		// Create a limited # of threads and keep them in the pool for 60 secs
-		ExecutorService cryptoExecutor = new TimeLoggingExecutor(
-				"CryptoExecutor", 0, MAX_EXECUTOR_THREADS, 60, SECONDS, queue,
-				threadFactory, policy);
+		cryptoExecutor = new TimeLoggingExecutor("CryptoExecutor", 0,
+				MAX_EXECUTOR_THREADS, 60, SECONDS, queue, policy);
+	}
+
+	@Provides
+	@Singleton
+	@CryptoExecutor
+	ExecutorService provideCryptoExecutorService(
+			LifecycleManager lifecycleManager) {
 		lifecycleManager.registerForShutdown(cryptoExecutor);
 		return cryptoExecutor;
 	}
 
 	@Provides
 	@CryptoExecutor
-	Executor provideCryptoExecutor(
-			@CryptoExecutor ExecutorService cryptoExecutor) {
+	Executor provideCryptoExecutor() {
 		return cryptoExecutor;
 	}
 }

bramble-core/src/main/java/org/briarproject/bramble/crypto/MessageEncrypter.java

@@ -39,13 +39,12 @@ import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.PrintStream;
+import java.nio.charset.Charset;
 import java.security.SecureRandom;
 import java.util.Scanner;
 
 import javax.annotation.concurrent.Immutable;
 
-import static org.briarproject.bramble.util.StringUtils.UTF_8;
-
 @Immutable
 @NotNullByDefault
 public class MessageEncrypter {
@@ -229,7 +228,7 @@ public class MessageEncrypter {
 		PublicKey publicKey =
 				encrypter.getKeyParser().parsePublicKey(keyBytes);
 		String message = readFully(System.in);
-		byte[] plaintext = message.getBytes(UTF_8);
+		byte[] plaintext = message.getBytes(Charset.forName("UTF-8"));
 		byte[] ciphertext = encrypter.encrypt(publicKey, plaintext);
 		System.out.println(AsciiArmour.wrap(ciphertext, LINE_LENGTH));
 	}
@@ -243,7 +242,7 @@ public class MessageEncrypter {
 				encrypter.getKeyParser().parsePrivateKey(keyBytes);
 		byte[] ciphertext = AsciiArmour.unwrap(readFully(System.in));
 		byte[] plaintext = encrypter.decrypt(privateKey, ciphertext);
-		System.out.println(new String(plaintext, UTF_8));
+		System.out.println(new String(plaintext, Charset.forName("UTF-8")));
 	}
 
 	private static String readFully(InputStream in) throws IOException {

bramble-core/src/main/java/org/briarproject/bramble/data/BdfReaderFactoryImpl.java

@@ -18,18 +18,12 @@ class BdfReaderFactoryImpl implements BdfReaderFactory {
 	@Override
 	public BdfReader createReader(InputStream in) {
 		return new BdfReaderImpl(in, DEFAULT_NESTED_LIMIT,
-				DEFAULT_MAX_BUFFER_SIZE, true);
-	}
-
-	@Override
-	public BdfReader createReader(InputStream in, boolean canonical) {
-		return new BdfReaderImpl(in, DEFAULT_NESTED_LIMIT,
-				DEFAULT_MAX_BUFFER_SIZE, canonical);
+				DEFAULT_MAX_BUFFER_SIZE);
 	}
 
 	@Override
 	public BdfReader createReader(InputStream in, int nestedLimit,
-			int maxBufferSize, boolean canonical) {
-		return new BdfReaderImpl(in, nestedLimit, maxBufferSize, canonical);
+			int maxBufferSize) {
+		return new BdfReaderImpl(in, nestedLimit, maxBufferSize);
 	}
 }

bramble-core/src/main/java/org/briarproject/bramble/data/BdfReaderImpl.java

@@ -33,24 +33,21 @@ import static org.briarproject.bramble.util.StringUtils.fromUtf8;
 
 @NotThreadSafe
 @NotNullByDefault
-final class BdfReaderImpl implements BdfReader {
+class BdfReaderImpl implements BdfReader {
 
 	private static final byte[] EMPTY_BUFFER = new byte[0];
 
 	private final InputStream in;
 	private final int nestedLimit, maxBufferSize;
-	private final boolean canonical;
 
 	private boolean hasLookahead = false, eof = false;
 	private byte next;
 	private byte[] buf = new byte[8];
 
-	BdfReaderImpl(InputStream in, int nestedLimit, int maxBufferSize,
-			boolean canonical) {
+	BdfReaderImpl(InputStream in, int nestedLimit, int maxBufferSize) {
 		this.in = in;
 		this.nestedLimit = nestedLimit;
 		this.maxBufferSize = maxBufferSize;
-		this.canonical = canonical;
 	}
 
 	private void readLookahead() throws IOException {
@@ -191,22 +188,13 @@ final class BdfReaderImpl implements BdfReader {
 
 	private short readInt16() throws IOException {
 		readIntoBuffer(2);
-		short value = (short) (((buf[0] & 0xFF) << 8) + (buf[1] & 0xFF));
-		if (canonical && value >= Byte.MIN_VALUE && value <= Byte.MAX_VALUE) {
-			// Value could have been encoded as an INT_8
-			throw new FormatException();
-		}
-		return value;
+		return (short) (((buf[0] & 0xFF) << 8) + (buf[1] & 0xFF));
 	}
 
 	private int readInt32() throws IOException {
 		readIntoBuffer(4);
 		int value = 0;
 		for (int i = 0; i < 4; i++) value |= (buf[i] & 0xFF) << (24 - i * 8);
-		if (canonical && value >= Short.MIN_VALUE && value <= Short.MAX_VALUE) {
-			// Value could have been encoded as an INT_16
-			throw new FormatException();
-		}
 		return value;
 	}
 
@@ -214,11 +202,6 @@ final class BdfReaderImpl implements BdfReader {
 		readIntoBuffer(8);
 		long value = 0;
 		for (int i = 0; i < 8; i++) value |= (buf[i] & 0xFFL) << (56 - i * 8);
-		if (canonical && value >= Integer.MIN_VALUE &&
-				value <= Integer.MAX_VALUE) {
-			// Value could have been encoded as an INT_32
-			throw new FormatException();
-		}
 		return value;
 	}
 
@@ -232,31 +215,6 @@ final class BdfReaderImpl implements BdfReader {
 		hasLookahead = false;
 	}
 
-	@Override
-	public boolean hasInt() throws IOException {
-		if (!hasLookahead) readLookahead();
-		if (eof) return false;
-		return next == INT_8 || next == INT_16 || next == INT_32;
-	}
-
-	@Override
-	public int readInt() throws IOException {
-		if (!hasInt()) throw new FormatException();
-		hasLookahead = false;
-		if (next == INT_8) return readInt8();
-		if (next == INT_16) return readInt16();
-		return readInt32();
-	}
-
-	@Override
-	public void skipInt() throws IOException {
-		if (!hasInt()) throw new FormatException();
-		if (next == INT_8) skip(1);
-		else if (next == INT_16) skip(2);
-		else skip(4);
-		hasLookahead = false;
-	}
-
 	@Override
 	public boolean hasDouble() throws IOException {
 		if (!hasLookahead) readLookahead();
@@ -365,19 +323,35 @@ final class BdfReaderImpl implements BdfReader {
 	private BdfList readList(int level) throws IOException {
 		if (!hasList()) throw new FormatException();
 		if (level > nestedLimit) throw new FormatException();
-		hasLookahead = false;
 		BdfList list = new BdfList();
-		while (!hasEnd()) list.add(readObject(level + 1));
-		readEnd();
+		readListStart();
+		while (!hasListEnd()) list.add(readObject(level + 1));
+		readListEnd();
 		return list;
 	}
 
+	@Override
+	public void readListStart() throws IOException {
+		if (!hasList()) throw new FormatException();
+		hasLookahead = false;
+	}
+
+	@Override
+	public boolean hasListEnd() throws IOException {
+		return hasEnd();
+	}
+
 	private boolean hasEnd() throws IOException {
 		if (!hasLookahead) readLookahead();
 		if (eof) return false;
 		return next == END;
 	}
 
+	@Override
+	public void readListEnd() throws IOException {
+		readEnd();
+	}
+
 	private void readEnd() throws IOException {
 		if (!hasEnd()) throw new FormatException();
 		hasLookahead = false;
@@ -387,7 +361,7 @@ final class BdfReaderImpl implements BdfReader {
 	public void skipList() throws IOException {
 		if (!hasList()) throw new FormatException();
 		hasLookahead = false;
-		while (!hasEnd()) skipObject();
+		while (!hasListEnd()) skipObject();
 		hasLookahead = false;
 	}
 
@@ -406,27 +380,35 @@ final class BdfReaderImpl implements BdfReader {
 	private BdfDictionary readDictionary(int level) throws IOException {
 		if (!hasDictionary()) throw new FormatException();
 		if (level > nestedLimit) throw new FormatException();
-		hasLookahead = false;
 		BdfDictionary dictionary = new BdfDictionary();
-		String prevKey = null;
-		while (!hasEnd()) {
-			String key = readString();
-			if (canonical && prevKey != null && key.compareTo(prevKey) <= 0) {
-				// Keys not unique and sorted
-				throw new FormatException();
-			}
-			dictionary.put(key, readObject(level + 1));
-			prevKey = key;
-		}
-		readEnd();
+		readDictionaryStart();
+		while (!hasDictionaryEnd())
+			dictionary.put(readString(), readObject(level + 1));
+		readDictionaryEnd();
 		return dictionary;
 	}
 
+	@Override
+	public void readDictionaryStart() throws IOException {
+		if (!hasDictionary()) throw new FormatException();
+		hasLookahead = false;
+	}
+
+	@Override
+	public boolean hasDictionaryEnd() throws IOException {
+		return hasEnd();
+	}
+
+	@Override
+	public void readDictionaryEnd() throws IOException {
+		readEnd();
+	}
+
 	@Override
 	public void skipDictionary() throws IOException {
 		if (!hasDictionary()) throw new FormatException();
 		hasLookahead = false;
-		while (!hasEnd()) {
+		while (!hasDictionaryEnd()) {
 			skipString();
 			skipObject();
 		}

bramble-core/src/main/java/org/briarproject/bramble/data/BdfWriterImpl.java

@@ -2,13 +2,11 @@ package org.briarproject.bramble.data;
 
 import org.briarproject.bramble.api.Bytes;
 import org.briarproject.bramble.api.FormatException;
-import org.briarproject.bramble.api.data.BdfDictionary;
 import org.briarproject.bramble.api.data.BdfWriter;
 import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.io.IOException;
 import java.io.OutputStream;
-import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
 import java.util.Map;
@@ -17,7 +15,6 @@ import java.util.Map.Entry;
 import javax.annotation.Nullable;
 import javax.annotation.concurrent.NotThreadSafe;
 
-import static java.util.Collections.sort;
 import static org.briarproject.bramble.api.data.BdfDictionary.NULL_VALUE;
 import static org.briarproject.bramble.data.Types.DICTIONARY;
 import static org.briarproject.bramble.data.Types.END;
@@ -36,11 +33,10 @@ import static org.briarproject.bramble.data.Types.STRING_16;
 import static org.briarproject.bramble.data.Types.STRING_32;
 import static org.briarproject.bramble.data.Types.STRING_8;
 import static org.briarproject.bramble.data.Types.TRUE;
-import static org.briarproject.bramble.util.StringUtils.UTF_8;
 
 @NotThreadSafe
 @NotNullByDefault
-final class BdfWriterImpl implements BdfWriter {
+class BdfWriterImpl implements BdfWriter {
 
 	private final OutputStream out;
 
@@ -117,7 +113,7 @@ final class BdfWriterImpl implements BdfWriter {
 
 	@Override
 	public void writeString(String s) throws IOException {
-		byte[] b = s.getBytes(UTF_8);
+		byte[] b = s.getBytes("UTF-8");
 		if (b.length <= Byte.MAX_VALUE) {
 			out.write(STRING_8);
 			out.write((byte) b.length);
@@ -165,33 +161,39 @@ final class BdfWriterImpl implements BdfWriter {
 		else if (o instanceof String) writeString((String) o);
 		else if (o instanceof byte[]) writeRaw((byte[]) o);
 		else if (o instanceof Bytes) writeRaw(((Bytes) o).getBytes());
-		else if (o instanceof List) writeList((List<?>) o);
-		else if (o instanceof Map) writeDictionary((Map<?, ?>) o);
+		else if (o instanceof List) writeList((List) o);
+		else if (o instanceof Map) writeDictionary((Map) o);
 		else throw new FormatException();
 	}
 
+	@Override
+	public void writeListStart() throws IOException {
+		out.write(LIST);
+	}
+
+	@Override
+	public void writeListEnd() throws IOException {
+		out.write(END);
+	}
+
 	@Override
 	public void writeDictionary(Map<?, ?> m) throws IOException {
 		out.write(DICTIONARY);
-		if (m instanceof BdfDictionary) {
-			// Entries are already sorted and keys are known to be strings
-			for (Entry<String, Object> e : ((BdfDictionary) m).entrySet()) {
-				writeString(e.getKey());
-				writeObject(e.getValue());
-			}
-		} else {
-			// Check that keys are strings, write entries in canonical order
-			List<String> keys = new ArrayList<>(m.size());
-			for (Object k : m.keySet()) {
-				if (!(k instanceof String)) throw new FormatException();
-				keys.add((String) k);
-			}
-			sort(keys);
-			for (String key : keys) {
-				writeString(key);
-				writeObject(m.get(key));
-			}
+		for (Entry<?, ?> e : m.entrySet()) {
+			if (!(e.getKey() instanceof String)) throw new FormatException();
+			writeString((String) e.getKey());
+			writeObject(e.getValue());
 		}
 		out.write(END);
 	}
+
+	@Override
+	public void writeDictionaryStart() throws IOException {
+		out.write(DICTIONARY);
+	}
+
+	@Override
+	public void writeDictionaryEnd() throws IOException {
+		out.write(END);
+	}
 }

bramble-core/src/main/java/org/briarproject/bramble/db/DatabaseExecutorModule.java

@@ -9,7 +9,6 @@ import java.util.concurrent.Executor;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.LinkedBlockingQueue;
 import java.util.concurrent.RejectedExecutionHandler;
-import java.util.concurrent.ThreadFactory;
 import java.util.concurrent.ThreadPoolExecutor;
 
 import javax.inject.Inject;
@@ -29,20 +28,24 @@ public class DatabaseExecutorModule {
 		ExecutorService executorService;
 	}
 
-	@Provides
-	@Singleton
-	@DatabaseExecutor
-	ExecutorService provideDatabaseExecutorService(
-			LifecycleManager lifecycleManager, ThreadFactory threadFactory) {
+	private final ExecutorService databaseExecutor;
+
+	public DatabaseExecutorModule() {
 		// Use an unbounded queue
 		BlockingQueue<Runnable> queue = new LinkedBlockingQueue<>();
 		// Discard tasks that are submitted during shutdown
 		RejectedExecutionHandler policy =
 				new ThreadPoolExecutor.DiscardPolicy();
 		// Use a single thread and keep it in the pool for 60 secs
-		ExecutorService databaseExecutor = new TimeLoggingExecutor(
-				"DatabaseExecutor", 0, 1, 60, SECONDS, queue, threadFactory,
-				policy);
+		databaseExecutor = new TimeLoggingExecutor("DatabaseExecutor", 0, 1,
+				60, SECONDS, queue, policy);
+	}
+
+	@Provides
+	@Singleton
+	@DatabaseExecutor
+	ExecutorService provideDatabaseExecutorService(
+			LifecycleManager lifecycleManager) {
 		lifecycleManager.registerForShutdown(databaseExecutor);
 		return databaseExecutor;
 	}

bramble-core/src/main/java/org/briarproject/bramble/event/DefaultEventExecutorModule.java

@@ -3,7 +3,6 @@ package org.briarproject.bramble.event;
 import org.briarproject.bramble.api.event.EventExecutor;
 
 import java.util.concurrent.Executor;
-import java.util.concurrent.ThreadFactory;
 
 import javax.inject.Singleton;
 
@@ -23,11 +22,10 @@ public class DefaultEventExecutorModule {
 	@Provides
 	@Singleton
 	@EventExecutor
-	Executor provideEventExecutor(ThreadFactory threadFactory) {
+	Executor provideEventExecutor() {
 		return newSingleThreadExecutor(r -> {
-			Thread t = threadFactory.newThread(r);
+			Thread t = new Thread(r);
 			t.setDaemon(true);
-			t.setName(t.getName() + "-Event");
 			return t;
 		});
 	}

bramble-core/src/main/java/org/briarproject/bramble/keyagreement/KeyAgreementModule.java

@@ -1,5 +1,7 @@
 package org.briarproject.bramble.keyagreement;
 
+import org.briarproject.bramble.api.data.BdfReaderFactory;
+import org.briarproject.bramble.api.data.BdfWriterFactory;
 import org.briarproject.bramble.api.keyagreement.KeyAgreementTask;
 import org.briarproject.bramble.api.keyagreement.PayloadEncoder;
 import org.briarproject.bramble.api.keyagreement.PayloadParser;
@@ -17,13 +19,13 @@ public class KeyAgreementModule {
 	}
 
 	@Provides
-	PayloadEncoder providePayloadEncoder(PayloadEncoderImpl payloadEncoder) {
-		return payloadEncoder;
+	PayloadEncoder providePayloadEncoder(BdfWriterFactory bdfWriterFactory) {
+		return new PayloadEncoderImpl(bdfWriterFactory);
 	}
 
 	@Provides
-	PayloadParser providePayloadParser(PayloadParserImpl payloadParser) {
-		return payloadParser;
+	PayloadParser providePayloadParser(BdfReaderFactory bdfReaderFactory) {
+		return new PayloadParserImpl(bdfReaderFactory);
 	}
 
 	@Provides

bramble-core/src/main/java/org/briarproject/bramble/keyagreement/KeyAgreementTransport.java

@@ -1,11 +1,11 @@
 package org.briarproject.bramble.keyagreement;
 
+import org.briarproject.bramble.api.Predicate;
 import org.briarproject.bramble.api.keyagreement.KeyAgreementConnection;
 import org.briarproject.bramble.api.plugin.TransportId;
 import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
 import org.briarproject.bramble.api.record.Record;
 import org.briarproject.bramble.api.record.RecordReader;
-import org.briarproject.bramble.api.record.RecordReader.RecordPredicate;
 import org.briarproject.bramble.api.record.RecordReaderFactory;
 import org.briarproject.bramble.api.record.RecordWriter;
 import org.briarproject.bramble.api.record.RecordWriterFactory;
@@ -34,12 +34,12 @@ class KeyAgreementTransport {
 			Logger.getLogger(KeyAgreementTransport.class.getName());
 
 	// Accept records with current protocol version, known record type
-	private static final RecordPredicate ACCEPT = r ->
+	private static final Predicate<Record> ACCEPT = r ->
 			r.getProtocolVersion() == PROTOCOL_VERSION &&
 					isKnownRecordType(r.getRecordType());
 
 	// Ignore records with current protocol version, unknown record type
-	private static final RecordPredicate IGNORE = r ->
+	private static final Predicate<Record> IGNORE = r ->
 			r.getProtocolVersion() == PROTOCOL_VERSION &&
 					!isKnownRecordType(r.getRecordType());
 

bramble-core/src/main/java/org/briarproject/bramble/keyagreement/PayloadEncoderImpl.java

@@ -1,6 +1,5 @@
 package org.briarproject.bramble.keyagreement;
 
-import org.briarproject.bramble.api.data.BdfList;
 import org.briarproject.bramble.api.data.BdfWriter;
 import org.briarproject.bramble.api.data.BdfWriterFactory;
 import org.briarproject.bramble.api.keyagreement.Payload;
@@ -14,8 +13,7 @@ import java.io.IOException;
 import javax.annotation.concurrent.Immutable;
 import javax.inject.Inject;
 
-import static org.briarproject.bramble.api.keyagreement.KeyAgreementConstants.QR_FORMAT_ID;
-import static org.briarproject.bramble.api.keyagreement.KeyAgreementConstants.QR_FORMAT_VERSION;
+import static org.briarproject.bramble.api.keyagreement.KeyAgreementConstants.PROTOCOL_VERSION;
 
 @Immutable
 @NotNullByDefault
@@ -31,16 +29,14 @@ class PayloadEncoderImpl implements PayloadEncoder {
 	@Override
 	public byte[] encode(Payload p) {
 		ByteArrayOutputStream out = new ByteArrayOutputStream();
-		int formatIdAndVersion = (QR_FORMAT_ID << 5) | QR_FORMAT_VERSION;
-		out.write(formatIdAndVersion);
-		BdfList payload = new BdfList();
-		payload.add(p.getCommitment());
-		for (TransportDescriptor d : p.getTransportDescriptors()) {
-			payload.add(d.getDescriptor());
-		}
+		out.write(PROTOCOL_VERSION);
 		BdfWriter w = bdfWriterFactory.createWriter(out);
 		try {
-			w.writeList(payload);
+			w.writeListStart(); // Payload start
+			w.writeRaw(p.getCommitment());
+			for (TransportDescriptor d : p.getTransportDescriptors())
+				w.writeList(d.getDescriptor());
+			w.writeListEnd(); // Payload end
 		} catch (IOException e) {
 			// Shouldn't happen with ByteArrayOutputStream
 			throw new AssertionError(e);

bramble-core/src/main/java/org/briarproject/bramble/keyagreement/PayloadParserImpl.java

@@ -1,7 +1,6 @@
 package org.briarproject.bramble.keyagreement;
 
 import org.briarproject.bramble.api.FormatException;
-import org.briarproject.bramble.api.Pair;
 import org.briarproject.bramble.api.UnsupportedVersionException;
 import org.briarproject.bramble.api.data.BdfList;
 import org.briarproject.bramble.api.data.BdfReader;
@@ -12,9 +11,6 @@ import org.briarproject.bramble.api.keyagreement.TransportDescriptor;
 import org.briarproject.bramble.api.plugin.BluetoothConstants;
 import org.briarproject.bramble.api.plugin.LanTcpConstants;
 import org.briarproject.bramble.api.plugin.TransportId;
-import org.briarproject.bramble.api.qrcode.QrCodeClassifier;
-import org.briarproject.bramble.api.qrcode.QrCodeClassifier.QrCodeType;
-import org.briarproject.bramble.api.qrcode.WrongQrCodeTypeException;
 import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.io.ByteArrayInputStream;
@@ -25,42 +21,34 @@ import java.util.List;
 import javax.annotation.concurrent.Immutable;
 import javax.inject.Inject;
 
+import static org.briarproject.bramble.api.keyagreement.KeyAgreementConstants.BETA_PROTOCOL_VERSION;
 import static org.briarproject.bramble.api.keyagreement.KeyAgreementConstants.COMMIT_LENGTH;
-import static org.briarproject.bramble.api.keyagreement.KeyAgreementConstants.QR_FORMAT_VERSION;
+import static org.briarproject.bramble.api.keyagreement.KeyAgreementConstants.PROTOCOL_VERSION;
 import static org.briarproject.bramble.api.keyagreement.KeyAgreementConstants.TRANSPORT_ID_BLUETOOTH;
 import static org.briarproject.bramble.api.keyagreement.KeyAgreementConstants.TRANSPORT_ID_LAN;
-import static org.briarproject.bramble.api.qrcode.QrCodeClassifier.QrCodeType.BQP;
-import static org.briarproject.bramble.util.StringUtils.ISO_8859_1;
 
 @Immutable
 @NotNullByDefault
 class PayloadParserImpl implements PayloadParser {
 
 	private final BdfReaderFactory bdfReaderFactory;
-	private final QrCodeClassifier qrCodeClassifier;
 
 	@Inject
-	PayloadParserImpl(BdfReaderFactory bdfReaderFactory,
-			QrCodeClassifier qrCodeClassifier) {
+	PayloadParserImpl(BdfReaderFactory bdfReaderFactory) {
 		this.bdfReaderFactory = bdfReaderFactory;
-		this.qrCodeClassifier = qrCodeClassifier;
 	}
 
 	@Override
-	public Payload parse(String payloadString) throws IOException {
-		Pair<QrCodeType, Integer> typeAndVersion =
-				qrCodeClassifier.classifyQrCode(payloadString);
-		QrCodeType qrCodeType = typeAndVersion.getFirst();
-		if (qrCodeType != BQP) throw new WrongQrCodeTypeException(qrCodeType);
-		int formatVersion = typeAndVersion.getSecond();
-		if (formatVersion != QR_FORMAT_VERSION) {
-			boolean tooOld = formatVersion < QR_FORMAT_VERSION;
+	public Payload parse(byte[] raw) throws IOException {
+		ByteArrayInputStream in = new ByteArrayInputStream(raw);
+		// First byte: the protocol version
+		int protocolVersion = in.read();
+		if (protocolVersion == -1) throw new FormatException();
+		if (protocolVersion != PROTOCOL_VERSION) {
+			boolean tooOld = protocolVersion < PROTOCOL_VERSION ||
+					protocolVersion == BETA_PROTOCOL_VERSION;
 			throw new UnsupportedVersionException(tooOld);
 		}
-		byte[] raw = payloadString.getBytes(ISO_8859_1);
-		ByteArrayInputStream in = new ByteArrayInputStream(raw);
-		// First byte: the format identifier and version (already parsed)
-		if (in.read() == -1) throw new AssertionError();
 		// The rest of the payload is a BDF list with one or more elements
 		BdfReader r = bdfReaderFactory.createReader(in);
 		BdfList payload = r.readList();
@@ -73,7 +61,7 @@ class PayloadParserImpl implements PayloadParser {
 		List<TransportDescriptor> recognised = new ArrayList<>();
 		for (int i = 1; i < payload.size(); i++) {
 			BdfList descriptor = payload.getList(i);
-			int transportId = descriptor.getInt(0);
+			long transportId = descriptor.getLong(0);
 			if (transportId == TRANSPORT_ID_BLUETOOTH) {
 				TransportId id = BluetoothConstants.ID;
 				recognised.add(new TransportDescriptor(id, descriptor));

bramble-core/src/main/java/org/briarproject/bramble/lifecycle/LifecycleModule.java

@@ -9,7 +9,6 @@ import java.util.concurrent.Executor;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.RejectedExecutionHandler;
 import java.util.concurrent.SynchronousQueue;
-import java.util.concurrent.ThreadFactory;
 import java.util.concurrent.ThreadPoolExecutor;
 
 import javax.inject.Inject;
@@ -29,6 +28,19 @@ public class LifecycleModule {
 		Executor executor;
 	}
 
+	private final ExecutorService ioExecutor;
+
+	public LifecycleModule() {
+		// The thread pool is unbounded, so use direct handoff
+		BlockingQueue<Runnable> queue = new SynchronousQueue<>();
+		// Discard tasks that are submitted during shutdown
+		RejectedExecutionHandler policy =
+				new ThreadPoolExecutor.DiscardPolicy();
+		// Create threads as required and keep them in the pool for 60 seconds
+		ioExecutor = new ThreadPoolExecutor(0, Integer.MAX_VALUE,
+				60, SECONDS, queue, policy);
+	}
+
 	@Provides
 	@Singleton
 	ShutdownManager provideShutdownManager() {
@@ -45,16 +57,7 @@ public class LifecycleModule {
 	@Provides
 	@Singleton
 	@IoExecutor
-	Executor provideIoExecutor(LifecycleManager lifecycleManager,
-			ThreadFactory threadFactory) {
-		// The thread pool is unbounded, so use direct handoff
-		BlockingQueue<Runnable> queue = new SynchronousQueue<>();
-		// Discard tasks that are submitted during shutdown
-		RejectedExecutionHandler policy =
-				new ThreadPoolExecutor.DiscardPolicy();
-		// Create threads as required and keep them in the pool for 60 seconds
-		ExecutorService ioExecutor = new ThreadPoolExecutor(0,
-				Integer.MAX_VALUE, 60, SECONDS, queue, threadFactory, policy);
+	Executor provideIoExecutor(LifecycleManager lifecycleManager) {
 		lifecycleManager.registerForShutdown(ioExecutor);
 		return ioExecutor;
 	}

bramble-core/src/main/java/org/briarproject/bramble/mailbox/MailboxApiCallerImpl.java

@@ -20,15 +20,12 @@ import static java.util.concurrent.TimeUnit.MILLISECONDS;
 class MailboxApiCallerImpl implements MailboxApiCaller {
 
 	private final TaskScheduler taskScheduler;
-	private final MailboxConfig mailboxConfig;
 	private final Executor ioExecutor;
 
 	@Inject
 	MailboxApiCallerImpl(TaskScheduler taskScheduler,
-			MailboxConfig mailboxConfig,
 			@IoExecutor Executor ioExecutor) {
 		this.taskScheduler = taskScheduler;
-		this.mailboxConfig = mailboxConfig;
 		this.ioExecutor = ioExecutor;
 	}
 
@@ -52,8 +49,7 @@ class MailboxApiCallerImpl implements MailboxApiCaller {
 		private boolean cancelled = false;
 
 		@GuardedBy("lock")
-		private long retryIntervalMs =
-				mailboxConfig.getApiCallerMinRetryInterval();
+		private long retryIntervalMs = MIN_RETRY_INTERVAL_MS;
 
 		private Task(ApiCall apiCall) {
 			this.apiCall = apiCall;
@@ -78,9 +74,8 @@ class MailboxApiCallerImpl implements MailboxApiCaller {
 					scheduledTask = taskScheduler.schedule(this::callApi,
 							ioExecutor, retryIntervalMs, MILLISECONDS);
 					// Increase the retry interval each time we retry
-					retryIntervalMs = min(
-							mailboxConfig.getApiCallerMaxRetryInterval(),
-							retryIntervalMs * 2);
+					retryIntervalMs =
+							min(MAX_RETRY_INTERVAL_MS, retryIntervalMs * 2);
 				}
 			} else {
 				synchronized (lock) {

bramble-core/src/main/java/org/briarproject/bramble/mailbox/MailboxConfig.java

@@ -1,24 +0,0 @@
-package org.briarproject.bramble.mailbox;
-
-import org.briarproject.bramble.api.plugin.Plugin;
-
-interface MailboxConfig {
-
-	/**
-	 * The minimum interval between API call retries in milliseconds.
-	 */
-	long getApiCallerMinRetryInterval();
-
-	/**
-	 * The maximum interval between API call retries in milliseconds.
-	 */
-	long getApiCallerMaxRetryInterval();
-
-	/**
-	 * How long (in milliseconds) the Tor plugin needs to be continuously
-	 * {@link Plugin.State#ACTIVE active} before we assume our contacts can
-	 * reach our hidden service.
-	 */
-	long getTorReachabilityPeriod();
-
-}

bramble-core/src/main/java/org/briarproject/bramble/mailbox/MailboxConfigImpl.java

@@ -1,30 +0,0 @@
-package org.briarproject.bramble.mailbox;
-
-import org.briarproject.nullsafety.NotNullByDefault;
-
-import javax.annotation.concurrent.Immutable;
-import javax.inject.Inject;
-
-@Immutable
-@NotNullByDefault
-class MailboxConfigImpl implements MailboxConfig {
-
-	@Inject
-	MailboxConfigImpl() {
-	}
-
-	@Override
-	public long getApiCallerMinRetryInterval() {
-		return MailboxApiCaller.MIN_RETRY_INTERVAL_MS;
-	}
-
-	@Override
-	public long getApiCallerMaxRetryInterval() {
-		return MailboxApiCaller.MAX_RETRY_INTERVAL_MS;
-	}
-
-	@Override
-	public long getTorReachabilityPeriod() {
-		return TorReachabilityMonitor.REACHABILITY_PERIOD_MS;
-	}
-}

bramble-core/src/main/java/org/briarproject/bramble/mailbox/MailboxManagerImpl.java

@@ -1,6 +1,5 @@
 package org.briarproject.bramble.mailbox;
 
-import org.briarproject.bramble.api.FormatException;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.db.Transaction;
 import org.briarproject.bramble.api.db.TransactionManager;
@@ -12,15 +11,12 @@ import org.briarproject.bramble.api.mailbox.MailboxSettingsManager;
 import org.briarproject.bramble.api.mailbox.MailboxStatus;
 import org.briarproject.bramble.api.mailbox.MailboxVersion;
 import org.briarproject.bramble.api.system.Clock;
-import org.briarproject.bramble.util.Base32;
 import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.io.IOException;
 import java.util.List;
 import java.util.concurrent.Executor;
 import java.util.logging.Logger;
-import java.util.regex.Matcher;
-import java.util.regex.Pattern;
 
 import javax.annotation.Nullable;
 import javax.annotation.concurrent.GuardedBy;
@@ -30,7 +26,6 @@ import javax.inject.Inject;
 import static java.util.logging.Level.WARNING;
 import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.util.LogUtils.logException;
-import static org.briarproject.bramble.util.StringUtils.ISO_8859_1;
 
 @Immutable
 @NotNullByDefault
@@ -103,22 +98,6 @@ class MailboxManagerImpl implements MailboxManager {
 		return created;
 	}
 
-	@Override
-	public String convertBase32Payload(String base32Payload)
-			throws FormatException {
-		Pattern regex = Pattern.compile("(briar-mailbox://)?([a-z2-7]{104})");
-		Matcher matcher = regex.matcher(base32Payload);
-		if (!matcher.find()) throw new FormatException();
-		String base32 = matcher.group(2);
-		byte[] payloadBytes;
-		try {
-			payloadBytes = Base32.decode(base32, false);
-		} catch (IllegalArgumentException e) {
-			throw new FormatException();
-		}
-		return new String(payloadBytes, ISO_8859_1);
-	}
-
 	@Override
 	public boolean checkConnection() {
 		List<MailboxVersion> versions = null;

bramble-core/src/main/java/org/briarproject/bramble/mailbox/MailboxModule.java

@@ -1,5 +1,6 @@
 package org.briarproject.bramble.mailbox;
 
+import org.briarproject.bramble.api.FeatureFlags;
 import org.briarproject.bramble.api.client.ClientHelper;
 import org.briarproject.bramble.api.contact.ContactManager;
 import org.briarproject.bramble.api.data.MetadataEncoder;
@@ -75,11 +76,14 @@ public class MailboxModule {
 			ValidationManager validationManager,
 			ClientHelper clientHelper,
 			MetadataEncoder metadataEncoder,
-			Clock clock) {
+			Clock clock,
+			FeatureFlags featureFlags) {
 		MailboxUpdateValidator validator = new MailboxUpdateValidator(
 				clientHelper, metadataEncoder, clock);
-		validationManager.registerMessageValidator(CLIENT_ID, MAJOR_VERSION,
-				validator);
+		if (featureFlags.shouldEnableMailbox()) {
+			validationManager.registerMessageValidator(CLIENT_ID,
+					MAJOR_VERSION, validator);
+		}
 		return validator;
 	}
 
@@ -91,26 +95,31 @@ public class MailboxModule {
 	@Provides
 	@Singleton
 	MailboxUpdateManager provideMailboxUpdateManager(
+			FeatureFlags featureFlags,
 			LifecycleManager lifecycleManager,
 			ValidationManager validationManager, ContactManager contactManager,
 			ClientVersioningManager clientVersioningManager,
 			MailboxSettingsManager mailboxSettingsManager,
 			MailboxUpdateManagerImpl mailboxUpdateManager) {
-		lifecycleManager.registerOpenDatabaseHook(mailboxUpdateManager);
-		validationManager.registerIncomingMessageHook(CLIENT_ID, MAJOR_VERSION,
-				mailboxUpdateManager);
-		contactManager.registerContactHook(mailboxUpdateManager);
-		clientVersioningManager.registerClient(CLIENT_ID, MAJOR_VERSION,
-				MINOR_VERSION, mailboxUpdateManager);
-		mailboxSettingsManager.registerMailboxHook(mailboxUpdateManager);
+		if (featureFlags.shouldEnableMailbox()) {
+			lifecycleManager.registerOpenDatabaseHook(mailboxUpdateManager);
+			validationManager.registerIncomingMessageHook(CLIENT_ID,
+					MAJOR_VERSION, mailboxUpdateManager);
+			contactManager.registerContactHook(mailboxUpdateManager);
+			clientVersioningManager.registerClient(CLIENT_ID, MAJOR_VERSION,
+					MINOR_VERSION, mailboxUpdateManager);
+			mailboxSettingsManager.registerMailboxHook(mailboxUpdateManager);
+		}
 		return mailboxUpdateManager;
 	}
 
 	@Provides
 	@Singleton
-	MailboxFileManager provideMailboxFileManager(EventBus eventBus,
-			MailboxFileManagerImpl mailboxFileManager) {
-		eventBus.addListener(mailboxFileManager);
+	MailboxFileManager provideMailboxFileManager(FeatureFlags featureFlags,
+			EventBus eventBus, MailboxFileManagerImpl mailboxFileManager) {
+		if (featureFlags.shouldEnableMailbox()) {
+			eventBus.addListener(mailboxFileManager);
+		}
 		return mailboxFileManager;
 	}
 
@@ -151,14 +160,17 @@ public class MailboxModule {
 			MailboxUpdateManager mailboxUpdateManager,
 			MailboxClientFactory mailboxClientFactory,
 			TorReachabilityMonitor reachabilityMonitor,
+			FeatureFlags featureFlags,
 			LifecycleManager lifecycleManager,
 			EventBus eventBus) {
 		MailboxClientManager manager = new MailboxClientManager(eventExecutor,
 				dbExecutor, db, contactManager, pluginManager,
 				mailboxSettingsManager, mailboxUpdateManager,
 				mailboxClientFactory, reachabilityMonitor);
-		lifecycleManager.registerService(manager);
-		eventBus.addListener(manager);
+		if (featureFlags.shouldEnableMailbox()) {
+			lifecycleManager.registerService(manager);
+			eventBus.addListener(manager);
+		}
 		return manager;
 	}
 }

bramble-core/src/main/java/org/briarproject/bramble/mailbox/MailboxPairingTaskFactoryImpl.java

@@ -6,7 +6,6 @@ import org.briarproject.bramble.api.event.EventExecutor;
 import org.briarproject.bramble.api.mailbox.MailboxPairingTask;
 import org.briarproject.bramble.api.mailbox.MailboxSettingsManager;
 import org.briarproject.bramble.api.mailbox.MailboxUpdateManager;
-import org.briarproject.bramble.api.qrcode.QrCodeClassifier;
 import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.nullsafety.NotNullByDefault;
 
@@ -26,7 +25,6 @@ class MailboxPairingTaskFactoryImpl implements MailboxPairingTaskFactory {
 	private final MailboxApi api;
 	private final MailboxSettingsManager mailboxSettingsManager;
 	private final MailboxUpdateManager mailboxUpdateManager;
-	private final QrCodeClassifier qrCodeClassifier;
 
 	@Inject
 	MailboxPairingTaskFactoryImpl(
@@ -36,8 +34,7 @@ class MailboxPairingTaskFactoryImpl implements MailboxPairingTaskFactory {
 			Clock clock,
 			MailboxApi api,
 			MailboxSettingsManager mailboxSettingsManager,
-			MailboxUpdateManager mailboxUpdateManager,
-			QrCodeClassifier qrCodeClassifier) {
+			MailboxUpdateManager mailboxUpdateManager) {
 		this.eventExecutor = eventExecutor;
 		this.db = db;
 		this.crypto = crypto;
@@ -45,13 +42,12 @@ class MailboxPairingTaskFactoryImpl implements MailboxPairingTaskFactory {
 		this.api = api;
 		this.mailboxSettingsManager = mailboxSettingsManager;
 		this.mailboxUpdateManager = mailboxUpdateManager;
-		this.qrCodeClassifier = qrCodeClassifier;
 	}
 
 	@Override
 	public MailboxPairingTask createPairingTask(String qrCodePayload) {
 		return new MailboxPairingTaskImpl(qrCodePayload, eventExecutor, db,
 				crypto, clock, api, mailboxSettingsManager,
-				mailboxUpdateManager, qrCodeClassifier);
+				mailboxUpdateManager);
 	}
 }

bramble-core/src/main/java/org/briarproject/bramble/mailbox/MailboxPairingTaskImpl.java

@@ -2,7 +2,6 @@ package org.briarproject.bramble.mailbox;
 
 import org.briarproject.bramble.api.Consumer;
 import org.briarproject.bramble.api.FormatException;
-import org.briarproject.bramble.api.Pair;
 import org.briarproject.bramble.api.contact.Contact;
 import org.briarproject.bramble.api.crypto.CryptoComponent;
 import org.briarproject.bramble.api.db.DatabaseComponent;
@@ -10,26 +9,18 @@ import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.event.EventExecutor;
 import org.briarproject.bramble.api.mailbox.MailboxAuthToken;
 import org.briarproject.bramble.api.mailbox.MailboxPairingState;
-import org.briarproject.bramble.api.mailbox.MailboxPairingState.ConnectionError;
-import org.briarproject.bramble.api.mailbox.MailboxPairingState.InvalidQrCode;
-import org.briarproject.bramble.api.mailbox.MailboxPairingState.MailboxAlreadyPaired;
-import org.briarproject.bramble.api.mailbox.MailboxPairingState.Paired;
-import org.briarproject.bramble.api.mailbox.MailboxPairingState.Pairing;
-import org.briarproject.bramble.api.mailbox.MailboxPairingState.QrCodeReceived;
-import org.briarproject.bramble.api.mailbox.MailboxPairingState.UnexpectedError;
 import org.briarproject.bramble.api.mailbox.MailboxPairingTask;
 import org.briarproject.bramble.api.mailbox.MailboxProperties;
 import org.briarproject.bramble.api.mailbox.MailboxSettingsManager;
 import org.briarproject.bramble.api.mailbox.MailboxUpdate;
 import org.briarproject.bramble.api.mailbox.MailboxUpdateManager;
-import org.briarproject.bramble.api.qrcode.QrCodeClassifier;
-import org.briarproject.bramble.api.qrcode.QrCodeClassifier.QrCodeType;
 import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.bramble.mailbox.MailboxApi.ApiException;
 import org.briarproject.bramble.mailbox.MailboxApi.MailboxAlreadyPairedException;
 import org.briarproject.nullsafety.NotNullByDefault;
 
 import java.io.IOException;
+import java.nio.charset.Charset;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
@@ -41,10 +32,7 @@ import javax.annotation.concurrent.ThreadSafe;
 
 import static java.util.logging.Level.WARNING;
 import static java.util.logging.Logger.getLogger;
-import static org.briarproject.bramble.api.mailbox.MailboxConstants.QR_FORMAT_VERSION;
-import static org.briarproject.bramble.api.qrcode.QrCodeClassifier.QrCodeType.MAILBOX;
 import static org.briarproject.bramble.util.LogUtils.logException;
-import static org.briarproject.bramble.util.StringUtils.ISO_8859_1;
 
 @ThreadSafe
 @NotNullByDefault
@@ -52,6 +40,9 @@ class MailboxPairingTaskImpl implements MailboxPairingTask {
 
 	private final static Logger LOG =
 			getLogger(MailboxPairingTaskImpl.class.getName());
+	@SuppressWarnings("CharsetObjectCanBeUsed") // Requires minSdkVersion >= 19
+	private static final Charset ISO_8859_1 = Charset.forName("ISO-8859-1");
+	private static final int VERSION_REQUIRED = 32;
 
 	private final String payload;
 	private final Executor eventExecutor;
@@ -61,8 +52,6 @@ class MailboxPairingTaskImpl implements MailboxPairingTask {
 	private final MailboxApi api;
 	private final MailboxSettingsManager mailboxSettingsManager;
 	private final MailboxUpdateManager mailboxUpdateManager;
-	private final QrCodeClassifier qrCodeClassifier;
-	private final long timeStarted;
 
 	private final Object lock = new Object();
 	@GuardedBy("lock")
@@ -79,8 +68,7 @@ class MailboxPairingTaskImpl implements MailboxPairingTask {
 			Clock clock,
 			MailboxApi api,
 			MailboxSettingsManager mailboxSettingsManager,
-			MailboxUpdateManager mailboxUpdateManager,
-			QrCodeClassifier qrCodeClassifier) {
+			MailboxUpdateManager mailboxUpdateManager) {
 		this.payload = payload;
 		this.eventExecutor = eventExecutor;
 		this.db = db;
@@ -89,9 +77,7 @@ class MailboxPairingTaskImpl implements MailboxPairingTask {
 		this.api = api;
 		this.mailboxSettingsManager = mailboxSettingsManager;
 		this.mailboxUpdateManager = mailboxUpdateManager;
-		this.qrCodeClassifier = qrCodeClassifier;
-		timeStarted = clock.currentTimeMillis();
-		state = new QrCodeReceived(timeStarted);
+		state = new MailboxPairingState.QrCodeReceived();
 	}
 
 	@Override
@@ -113,30 +99,22 @@ class MailboxPairingTaskImpl implements MailboxPairingTask {
 
 	@Override
 	public void run() {
-		Pair<QrCodeType, Integer> typeAndVersion =
-				qrCodeClassifier.classifyQrCode(payload);
-		QrCodeType qrCodeType = typeAndVersion.getFirst();
-		int formatVersion = typeAndVersion.getSecond();
-		if (qrCodeType != MAILBOX || formatVersion != QR_FORMAT_VERSION) {
-			setState(new InvalidQrCode(qrCodeType, formatVersion));
-			return;
-		}
 		try {
 			pairMailbox();
 		} catch (FormatException e) {
-			onMailboxError(e, new InvalidQrCode(qrCodeType, formatVersion));
+			onMailboxError(e, new MailboxPairingState.InvalidQrCode());
 		} catch (MailboxAlreadyPairedException e) {
-			onMailboxError(e, new MailboxAlreadyPaired());
+			onMailboxError(e, new MailboxPairingState.MailboxAlreadyPaired());
 		} catch (IOException e) {
-			onMailboxError(e, new ConnectionError());
+			onMailboxError(e, new MailboxPairingState.ConnectionError());
 		} catch (ApiException | DbException e) {
-			onMailboxError(e, new UnexpectedError());
+			onMailboxError(e, new MailboxPairingState.UnexpectedError());
 		}
 	}
 
 	private void pairMailbox() throws IOException, ApiException, DbException {
 		MailboxProperties mailboxProperties = decodeQrCodePayload(payload);
-		setState(new Pairing(timeStarted));
+		setState(new MailboxPairingState.Pairing());
 		MailboxProperties ownerProperties = api.setup(mailboxProperties);
 		long time = clock.currentTimeMillis();
 		db.transaction(false, txn -> {
@@ -155,7 +133,7 @@ class MailboxPairingTaskImpl implements MailboxPairingTask {
 				}
 			}
 		});
-		setState(new Paired());
+		setState(new MailboxPairingState.Paired());
 	}
 
 	private void onMailboxError(Exception e, MailboxPairingState state) {
@@ -189,6 +167,14 @@ class MailboxPairingTaskImpl implements MailboxPairingTask {
 			}
 			throw new FormatException();
 		}
+		int version = bytes[0] & 0xFF;
+		if (version != VERSION_REQUIRED) {
+			if (LOG.isLoggable(WARNING)) {
+				LOG.warning("QR code has not version " + VERSION_REQUIRED +
+						": " + version);
+			}
+			throw new FormatException();
+		}
 		LOG.info("QR code is valid");
 		byte[] onionPubKey = Arrays.copyOfRange(bytes, 1, 33);
 		String onion = crypto.encodeOnion(onionPubKey);

bramble-core/src/main/java/org/briarproject/bramble/mailbox/TorReachabilityMonitorImpl.java

@@ -32,7 +32,6 @@ class TorReachabilityMonitorImpl
 
 	private final Executor ioExecutor;
 	private final TaskScheduler taskScheduler;
-	private final MailboxConfig mailboxConfig;
 	private final PluginManager pluginManager;
 	private final EventBus eventBus;
 	private final Object lock = new Object();
@@ -51,12 +50,10 @@ class TorReachabilityMonitorImpl
 	TorReachabilityMonitorImpl(
 			@IoExecutor Executor ioExecutor,
 			TaskScheduler taskScheduler,
-			MailboxConfig mailboxConfig,
 			PluginManager pluginManager,
 			EventBus eventBus) {
 		this.ioExecutor = ioExecutor;
 		this.taskScheduler = taskScheduler;
-		this.mailboxConfig = mailboxConfig;
 		this.pluginManager = pluginManager;
 		this.eventBus = eventBus;
 	}
@@ -113,7 +110,7 @@ class TorReachabilityMonitorImpl
 		synchronized (lock) {
 			if (destroyed || task != null) return;
 			task = taskScheduler.schedule(this::onTorReachable, ioExecutor,
-					mailboxConfig.getTorReachabilityPeriod(), MILLISECONDS);
+					REACHABILITY_PERIOD_MS, MILLISECONDS);
 		}
 	}
 

bramble-core/src/main/java/org/briarproject/bramble/mailbox/UrlConverterModule.java

@@ -4,11 +4,7 @@ import dagger.Module;
 import dagger.Provides;
 
 @Module
-public class ModularMailboxModule {
-	@Provides
-	MailboxConfig provideMailboxConfig(MailboxConfigImpl mailboxConfig) {
-		return mailboxConfig;
-	}
+public class UrlConverterModule {
 
 	@Provides
 	UrlConverter provideUrlConverter(UrlConverterImpl urlConverter) {

bramble-core/src/main/java/org/briarproject/bramble/plugin/PluginManagerImpl.java

@@ -40,9 +40,9 @@ import java.util.concurrent.CopyOnWriteArrayList;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.Executor;
 import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.concurrent.atomic.AtomicReference;
 import java.util.logging.Logger;
 
-import javax.annotation.concurrent.GuardedBy;
 import javax.annotation.concurrent.ThreadSafe;
 import javax.inject.Inject;
 
@@ -288,10 +288,8 @@ class PluginManagerImpl implements PluginManager, Service {
 	private class Callback implements PluginCallback {
 
 		private final TransportId id;
-		private final Object stateLock = new Object();
-
-		@GuardedBy("lock")
-		private State state = STARTING_STOPPING;
+		private final AtomicReference<State> state =
+				new AtomicReference<>(STARTING_STOPPING);
 
 		private Callback(TransportId id) {
 			this.id = id;
@@ -345,26 +343,22 @@ class PluginManagerImpl implements PluginManager, Service {
 
 		@Override
 		public void pluginStateChanged(State newState) {
-			synchronized (stateLock) {
-				if (newState != state) {
-					State oldState = state;
-					state = newState;
-					if (LOG.isLoggable(INFO)) {
-						LOG.info(id + " changed from state " + oldState
-								+ " to " + newState);
-					}
-					eventBus.broadcast(new TransportStateEvent(id, newState));
-					if (newState == ACTIVE) {
-						eventBus.broadcast(new TransportActiveEvent(id));
-					} else if (oldState == ACTIVE) {
-						eventBus.broadcast(new TransportInactiveEvent(id));
-					}
-				} else if (newState == DISABLED) {
-					// Broadcast an event even though the state hasn't changed,
-					// as the reasons for the plugin being disabled may have
-					// changed
-					eventBus.broadcast(new TransportStateEvent(id, newState));
+			State oldState = state.getAndSet(newState);
+			if (newState != oldState) {
+				if (LOG.isLoggable(INFO)) {
+					LOG.info(id + " changed from state " + oldState
+							+ " to " + newState);
 				}
+				eventBus.broadcast(new TransportStateEvent(id, newState));
+				if (newState == ACTIVE) {
+					eventBus.broadcast(new TransportActiveEvent(id));
+				} else if (oldState == ACTIVE) {
+					eventBus.broadcast(new TransportInactiveEvent(id));
+				}
+			} else if (newState == DISABLED) {
+				// Broadcast an event even though the state hasn't changed, as
+				// the reasons for the plugin being disabled may have changed
+				eventBus.broadcast(new TransportStateEvent(id, newState));
 			}
 		}
 

bramble-core/src/main/java/org/briarproject/bramble/plugin/bluetooth/AbstractBluetoothPlugin.java

@@ -89,17 +89,6 @@ abstract class AbstractBluetoothPlugin<S, SS> implements BluetoothPlugin,
 
 	private volatile String contactConnectionsUuid = null;
 
-	/**
-	 * Override and return true, if the plugin is now allowed to access the
-	 * Bluetooth hardware.
-	 * If this returns false, the plugin must be
-	 * {@link org.briarproject.bramble.api.plugin.Plugin.State#DISABLED}
-	 * in {@link #start()} and not attempt to access Bluetooth hardware.
-	 */
-	protected boolean isBluetoothAccessible() {
-		return true;
-	}
-
 	abstract void initialiseAdapter() throws IOException;
 
 	abstract boolean isAdapterEnabled();
@@ -187,28 +176,19 @@ abstract class AbstractBluetoothPlugin<S, SS> implements BluetoothPlugin,
 				DEFAULT_PREF_PLUGIN_ENABLE);
 		everConnected.set(settings.getBoolean(PREF_EVER_CONNECTED,
 				DEFAULT_PREF_EVER_CONNECTED));
-		// disable plugin, if conditions for enabling are not met
-		if (enabledByUser && !isBluetoothAccessible()) {
-			enabledByUser = false;
-			settings.putBoolean(PREF_PLUGIN_ENABLE, false);
-			callback.mergeSettings(settings);
-		}
 		state.setStarted(enabledByUser);
 		try {
 			initialiseAdapter();
 		} catch (IOException e) {
 			throw new PluginException(e);
 		}
-		if (enabledByUser) {
-			updateProperties();
-			if (isAdapterEnabled()) bind();
-		}
+		updateProperties();
+		if (enabledByUser && isAdapterEnabled()) bind();
 	}
 
 	private void bind() {
 		ioExecutor.execute(() -> {
 			if (getState() != INACTIVE) return;
-			if (contactConnectionsUuid == null) updateProperties();
 			// Bind a server socket to accept connections from contacts
 			SS ss;
 			try {
@@ -554,8 +534,7 @@ abstract class AbstractBluetoothPlugin<S, SS> implements BluetoothPlugin,
 	private void onSettingsUpdated(Settings settings) {
 		boolean enabledByUser = settings.getBoolean(PREF_PLUGIN_ENABLE,
 				DEFAULT_PREF_PLUGIN_ENABLE);
-		boolean shouldEnable = enabledByUser && isBluetoothAccessible();
-		SS ss = state.setEnabledByUser(shouldEnable);
+		SS ss = state.setEnabledByUser(enabledByUser);
 		State s = getState();
 		if (ss != null) {
 			LOG.info("Disabled by user, closing server socket");

bramble-core/src/main/java/org/briarproject/bramble/plugin/tcp/LanTcpPlugin.java

@@ -419,7 +419,7 @@ class LanTcpPlugin extends TcpPlugin {
 	private InetSocketAddress parseSocketAddress(BdfList descriptor)
 			throws FormatException {
 		byte[] address = descriptor.getRaw(1);
-		int port = descriptor.getInt(2);
+		int port = descriptor.getLong(2).intValue();
 		if (port < 1 || port > MAX_16_BIT_UNSIGNED) throw new FormatException();
 		try {
 			InetAddress addr = InetAddress.getByAddress(address);

bramble-core/src/main/java/org/briarproject/bramble/plugin/tor/CircumventionModule.java

@@ -1,8 +1,5 @@
 package org.briarproject.bramble.plugin.tor;
 
-import org.briarproject.onionwrapper.CircumventionProvider;
-import org.briarproject.onionwrapper.CircumventionProviderFactory;
-
 import javax.inject.Singleton;
 
 import dagger.Module;
@@ -13,7 +10,8 @@ public class CircumventionModule {
 
 	@Provides
 	@Singleton
-	CircumventionProvider provideCircumventionProvider() {
-		return CircumventionProviderFactory.createCircumventionProvider();
+	CircumventionProvider provideCircumventionProvider(
+			CircumventionProviderImpl provider) {
+		return provider;
 	}
 }

bramble-core/src/main/java/org/briarproject/bramble/plugin/tor/CircumventionProvider.java

@@ -0,0 +1,75 @@
+package org.briarproject.bramble.plugin.tor;
+
+import org.briarproject.bramble.api.lifecycle.IoExecutor;
+import org.briarproject.nullsafety.NotNullByDefault;
+
+import java.util.List;
+
+@NotNullByDefault
+public interface CircumventionProvider {
+
+	enum BridgeType {
+		DEFAULT_OBFS4,
+		NON_DEFAULT_OBFS4,
+		VANILLA,
+		MEEK,
+		SNOWFLAKE
+	}
+
+	/**
+	 * Countries where Tor is blocked, i.e. vanilla Tor connection won't work.
+	 * <p>
+	 * See https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2
+	 * and https://trac.torproject.org/projects/tor/wiki/doc/OONI/censorshipwiki
+	 */
+	String[] BLOCKED = {"BY", "CN", "EG", "IR", "RU", "TM", "VE"};
+
+	/**
+	 * Countries where bridge connections are likely to work.
+	 * Should be a subset of {@link #BLOCKED} and the union of
+	 * {@link #DEFAULT_BRIDGES}, {@link #NON_DEFAULT_BRIDGES} and
+	 * {@link #DPI_BRIDGES}.
+	 */
+	String[] BRIDGES = {"BY", "CN", "EG", "IR", "RU", "TM", "VE"};
+
+	/**
+	 * Countries where default obfs4 or vanilla bridges are likely to work.
+	 * Should be a subset of {@link #BRIDGES}.
+	 */
+	String[] DEFAULT_BRIDGES = {"EG", "VE"};
+
+	/**
+	 * Countries where non-default obfs4 or vanilla bridges are likely to work.
+	 * Should be a subset of {@link #BRIDGES}.
+	 */
+	String[] NON_DEFAULT_BRIDGES = {"BY", "RU"};
+
+	/**
+	 * Countries where vanilla bridges are blocked via DPI but non-default
+	 * obfs4 bridges, meek and snowflake may work. Should be a subset of
+	 * {@link #BRIDGES}.
+	 */
+	String[] DPI_BRIDGES = {"CN", "IR", "TM"};
+
+	/**
+	 * Returns true if vanilla Tor connections are blocked in the given country.
+	 */
+	boolean isTorProbablyBlocked(String countryCode);
+
+	/**
+	 * Returns true if bridge connections of some type work in the given
+	 * country.
+	 */
+	boolean doBridgesWork(String countryCode);
+
+	/**
+	 * Returns the types of bridge connection that are suitable for the given
+	 * country, or {@link #DEFAULT_BRIDGES} if no bridge type is known
+	 * to work.
+	 */
+	List<BridgeType> getSuitableBridgeTypes(String countryCode);
+
+	@IoExecutor
+	List<String> getBridges(BridgeType type, String countryCode,
+			boolean letsEncrypt);
+}

bramble-core/src/main/java/org/briarproject/bramble/plugin/tor/CircumventionProviderImpl.java

@@ -0,0 +1,155 @@
+package org.briarproject.bramble.plugin.tor;
+
+import org.briarproject.bramble.api.lifecycle.IoExecutor;
+import org.briarproject.nullsafety.NotNullByDefault;
+
+import java.io.InputStream;
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Scanner;
+import java.util.Set;
+import java.util.TreeMap;
+
+import javax.annotation.concurrent.Immutable;
+import javax.inject.Inject;
+
+import static java.util.Arrays.asList;
+import static org.briarproject.bramble.plugin.tor.CircumventionProvider.BridgeType.DEFAULT_OBFS4;
+import static org.briarproject.bramble.plugin.tor.CircumventionProvider.BridgeType.MEEK;
+import static org.briarproject.bramble.plugin.tor.CircumventionProvider.BridgeType.NON_DEFAULT_OBFS4;
+import static org.briarproject.bramble.plugin.tor.CircumventionProvider.BridgeType.SNOWFLAKE;
+import static org.briarproject.bramble.plugin.tor.CircumventionProvider.BridgeType.VANILLA;
+import static org.briarproject.bramble.plugin.tor.CircumventionProviderImpl.SnowflakeBroker.AMP_CACHE;
+import static org.briarproject.bramble.plugin.tor.CircumventionProviderImpl.SnowflakeBroker.AZURE;
+import static org.briarproject.bramble.plugin.tor.CircumventionProviderImpl.SnowflakeBroker.FASTLY;
+import static org.briarproject.nullsafety.NullSafety.requireNonNull;
+
+@Immutable
+@NotNullByDefault
+class CircumventionProviderImpl implements CircumventionProvider {
+
+	private final static String BRIDGE_FILE_NAME = "bridges";
+	private final static String SNOWFLAKE_PARAMS_FILE_NAME = "snowflake-params";
+	private final static String DEFAULT_COUNTRY_CODE = "ZZ";
+
+	private static final Set<String> BLOCKED_IN_COUNTRIES =
+			new HashSet<>(asList(BLOCKED));
+	private static final Set<String> BRIDGE_COUNTRIES =
+			new HashSet<>(asList(BRIDGES));
+	private static final Set<String> DEFAULT_OBFS4_BRIDGE_COUNTRIES =
+			new HashSet<>(asList(DEFAULT_BRIDGES));
+	private static final Set<String> NON_DEFAULT_BRIDGE_COUNTRIES =
+			new HashSet<>(asList(NON_DEFAULT_BRIDGES));
+	private static final Set<String> DPI_COUNTRIES =
+			new HashSet<>(asList(DPI_BRIDGES));
+
+	// Package access for testing
+	enum SnowflakeBroker {
+
+		FASTLY('F'),
+		AZURE('A'),
+		AMP_CACHE('M');
+
+		private final char value;
+
+		SnowflakeBroker(char value) {
+			this.value = value;
+		}
+	}
+
+	@Inject
+	CircumventionProviderImpl() {
+	}
+
+	@Override
+	public boolean isTorProbablyBlocked(String countryCode) {
+		return BLOCKED_IN_COUNTRIES.contains(countryCode);
+	}
+
+	@Override
+	public boolean doBridgesWork(String countryCode) {
+		return BRIDGE_COUNTRIES.contains(countryCode);
+	}
+
+	@Override
+	public List<BridgeType> getSuitableBridgeTypes(String countryCode) {
+		if (DEFAULT_OBFS4_BRIDGE_COUNTRIES.contains(countryCode)) {
+			return asList(DEFAULT_OBFS4, VANILLA);
+		} else if (NON_DEFAULT_BRIDGE_COUNTRIES.contains(countryCode)) {
+			return asList(NON_DEFAULT_OBFS4, VANILLA);
+		} else if (DPI_COUNTRIES.contains(countryCode)) {
+			return asList(NON_DEFAULT_OBFS4, MEEK, SNOWFLAKE);
+		} else {
+			return asList(DEFAULT_OBFS4, VANILLA);
+		}
+	}
+
+	@Override
+	@IoExecutor
+	public List<String> getBridges(BridgeType type, String countryCode,
+			boolean letsEncrypt) {
+		InputStream is = requireNonNull(getClass().getClassLoader()
+				.getResourceAsStream(BRIDGE_FILE_NAME));
+		Scanner scanner = new Scanner(is);
+
+		List<String> bridges = new ArrayList<>();
+		while (scanner.hasNextLine()) {
+			String line = scanner.nextLine();
+			if ((type == DEFAULT_OBFS4 && line.startsWith("d ")) ||
+					(type == NON_DEFAULT_OBFS4 && line.startsWith("n ")) ||
+					(type == VANILLA && line.startsWith("v ")) ||
+					(type == MEEK && line.startsWith("m "))) {
+				bridges.add(line.substring(2));
+			} else if (type == SNOWFLAKE && line.startsWith("s ")) {
+				String params;
+				// If the client can verify Let's Encrypt certificates then
+				// use the Fastly broker, otherwise use Azure
+				if (letsEncrypt) {
+					params = getSnowflakeParams(countryCode, FASTLY);
+				} else {
+					params = getSnowflakeParams(countryCode, AZURE);
+				}
+				bridges.add(line.substring(2) + " " + params);
+				// Also use the AMP cache broker
+				params = getSnowflakeParams(countryCode, AMP_CACHE);
+				bridges.add(line.substring(2) + " " + params);
+			}
+		}
+		scanner.close();
+		return bridges;
+	}
+
+	// Package access for testing
+	String getSnowflakeParams(String countryCode, SnowflakeBroker broker) {
+		Map<String, String> params = loadSnowflakeParams();
+		if (countryCode.isEmpty()) countryCode = DEFAULT_COUNTRY_CODE;
+		// If we have parameters for this country code, return them
+		String value = params.get(makeKey(countryCode, broker));
+		if (value != null) return value;
+		// Return the default parameters
+		value = params.get(makeKey(DEFAULT_COUNTRY_CODE, broker));
+		return requireNonNull(value);
+	}
+
+	private Map<String, String> loadSnowflakeParams() {
+		InputStream is = requireNonNull(getClass().getClassLoader()
+				.getResourceAsStream(SNOWFLAKE_PARAMS_FILE_NAME));
+		Scanner scanner = new Scanner(is);
+		Map<String, String> params = new TreeMap<>();
+		while (scanner.hasNextLine()) {
+			String line = scanner.nextLine();
+			if (line.length() < 5) continue;
+			String key = line.substring(0, 4); // Country code, space, broker
+			String value = line.substring(5);
+			params.put(key, value);
+		}
+		scanner.close();
+		return params;
+	}
+
+	private String makeKey(String countryCode, SnowflakeBroker broker) {
+		return countryCode + " " + broker.value;
+	}
+}