Merge branch '1081-share-app-via-wifi-hotspot' into offline-testing

# Conflicts:
#	bramble-api/src/main/java/org/briarproject/bramble/api/FeatureFlags.java
#	bramble-core/build.gradle
#	bramble-core/src/test/java/org/briarproject/bramble/test/BrambleCoreIntegrationTestModule.java
#	bramble-core/witness.gradle
#	bramble-java/src/main/java/org/briarproject/bramble/plugin/tor/UnixTorPluginFactory.java
#	briar-android/src/main/java/org/briarproject/briar/android/AndroidComponent.java
#	briar-android/src/main/java/org/briarproject/briar/android/AppModule.java
#	briar-android/src/main/java/org/briarproject/briar/android/activity/ActivityComponent.java
#	briar-android/src/main/java/org/briarproject/briar/android/util/UiUtils.java
#	briar-android/src/main/res/values/strings.xml
#	briar-headless/src/main/java/org/briarproject/briar/headless/HeadlessModule.kt
#	briar-headless/src/test/java/org/briarproject/briar/headless/HeadlessTestModule.kt

bramble-android/build.gradle

@@ -15,8 +15,8 @@ android {
 	defaultConfig {
 		minSdkVersion 16
 		targetSdkVersion 30
-		versionCode 10303
-		versionName "1.3.3"
+		versionCode 10305
+		versionName "1.3.5"
 		consumerProguardFiles 'proguard-rules.txt'
 
 		testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
@@ -42,18 +42,18 @@ configurations {
 
 dependencies {
 	implementation project(path: ':bramble-core', configuration: 'default')
-	tor 'org.briarproject:tor-android:0.3.5.13@zip'
+	tor 'org.briarproject:tor-android:0.3.5.15'
 	tor 'org.briarproject:obfs4proxy-android:0.0.12-dev-40245c4a@zip'
 
-	annotationProcessor 'com.google.dagger:dagger-compiler:2.24'
+	annotationProcessor "com.google.dagger:dagger-compiler:$dagger_version"
 
 	compileOnly 'javax.annotation:jsr250-api:1.0'
 
 	testImplementation project(path: ':bramble-api', configuration: 'testOutput')
-	testImplementation 'junit:junit:4.12'
-	testImplementation "org.jmock:jmock:2.8.2"
-	testImplementation "org.jmock:jmock-junit4:2.8.2"
-	testImplementation "org.jmock:jmock-legacy:2.8.2"
+	testImplementation "junit:junit:$junit_version"
+	testImplementation "org.jmock:jmock:$jmock_version"
+	testImplementation "org.jmock:jmock-junit4:$jmock_version"
+	testImplementation "org.jmock:jmock-legacy:$jmock_version"
 }
 
 def torBinariesDir = 'src/main/res/raw'

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

@@ -87,7 +87,7 @@ class AndroidBluetoothPlugin extends
 			Clock clock,
 			Backoff backoff,
 			PluginCallback callback,
-			int maxLatency,
+			long maxLatency,
 			int maxIdleTime) {
 		super(connectionLimiter, connectionFactory, ioExecutor,
 				wakefulIoExecutor, secureRandom, backoff, callback,

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

@@ -75,7 +75,7 @@ public class AndroidBluetoothPluginFactory implements DuplexPluginFactory {
 	}
 
 	@Override
-	public int getMaxLatency() {
+	public long getMaxLatency() {
 		return MAX_LATENCY;
 	}
 

bramble-android/src/main/java/org/briarproject/bramble/plugin/file/AndroidRemovableDrivePlugin.java

@@ -4,6 +4,7 @@ import android.app.Application;
 import android.net.Uri;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.api.plugin.PluginCallback;
 import org.briarproject.bramble.api.properties.TransportProperties;
 
 import java.io.IOException;
@@ -21,8 +22,9 @@ class AndroidRemovableDrivePlugin extends RemovableDrivePlugin {
 
 	private final Application app;
 
-	AndroidRemovableDrivePlugin(Application app, int maxLatency) {
-		super(maxLatency);
+	AndroidRemovableDrivePlugin(Application app, PluginCallback callback,
+			long maxLatency) {
+		super(callback, maxLatency);
 		this.app = app;
 	}
 

bramble-android/src/main/java/org/briarproject/bramble/plugin/file/AndroidRemovableDrivePluginFactory.java

@@ -35,13 +35,13 @@ public class AndroidRemovableDrivePluginFactory implements
 	}
 
 	@Override
-	public int getMaxLatency() {
+	public long getMaxLatency() {
 		return MAX_LATENCY;
 	}
 
 	@Nullable
 	@Override
 	public SimplexPlugin createPlugin(PluginCallback callback) {
-		return new AndroidRemovableDrivePlugin(app, MAX_LATENCY);
+		return new AndroidRemovableDrivePlugin(app, callback, MAX_LATENCY);
 	}
 }

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

@@ -67,7 +67,7 @@ class AndroidLanTcpPlugin extends LanTcpPlugin {
 			Application app,
 			Backoff backoff,
 			PluginCallback callback,
-			int maxLatency,
+			long maxLatency,
 			int maxIdleTime,
 			int connectionTimeout) {
 		super(ioExecutor, wakefulIoExecutor, backoff, callback, maxLatency,

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

@@ -55,7 +55,7 @@ public class AndroidLanTcpPluginFactory implements DuplexPluginFactory {
 	}
 
 	@Override
-	public int getMaxLatency() {
+	public long getMaxLatency() {
 		return MAX_LATENCY;
 	}
 

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

@@ -68,7 +68,7 @@ class AndroidTorPlugin extends TorPlugin {
 			TorRendezvousCrypto torRendezvousCrypto,
 			PluginCallback callback,
 			String architecture,
-			int maxLatency,
+			long maxLatency,
 			int maxIdleTime,
 			File torDirectory) {
 		super(ioExecutor, wakefulIoExecutor, networkManager, locationUtils,

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

@@ -94,7 +94,7 @@ public class AndroidTorPluginFactory implements DuplexPluginFactory {
 	}
 
 	@Override
-	public int getMaxLatency() {
+	public long getMaxLatency() {
 		return MAX_LATENCY;
 	}
 

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

@@ -10,17 +10,20 @@ import org.briarproject.bramble.api.Pair;
 import org.briarproject.bramble.api.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.content.Context.MODE_PRIVATE;
 import static android.os.Build.VERSION.SDK_INT;
+import static java.lang.Runtime.getRuntime;
 import static java.util.Arrays.asList;
 import static org.briarproject.bramble.api.nullsafety.NullSafety.requireNonNull;
 
@@ -118,4 +121,17 @@ public class AndroidUtils {
 	public static String[] getSupportedImageContentTypes() {
 		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;
+		}
+	}
 }

bramble-android/witness.gradle

@@ -1,42 +1,43 @@
 dependencyVerification {
     verify = [
-        'cglib:cglib:3.2.0:cglib-3.2.0.jar:adb13bab79712ad6bdf1bd59f2a3918018a8016e722e8a357065afb9e6690861',
-        'com.android.tools.analytics-library:protos:27.1.1:protos-27.1.1.jar:13f77e73762e58ab372d140b3a6be6903aea9775b62dd14fbc62d4cc7069c9a4',
-        'com.android.tools.analytics-library:shared:27.1.1:shared-27.1.1.jar:82930a52001410e97d809930b670f4de3002286975f046b9de5f6b777b06d366',
-        'com.android.tools.analytics-library:tracker:27.1.1:tracker-27.1.1.jar:31bc5a00be0055bac89c9b2f34751883e987cd89e3ac1783720645c164f591d9',
+        'cglib:cglib:3.2.8:cglib-3.2.8.jar:3f64de999ecc5595dc84ca8ff0879d8a34c8623f9ef3c517a53ed59023fcb9db',
+        'com.android.tools.analytics-library:protos:27.1.3:protos-27.1.3.jar:0d9e6cff60b318baac250b6f5bb076a8161103338bf2749cdf1db8a5a13a1f12',
+        'com.android.tools.analytics-library:shared:27.1.3:shared-27.1.3.jar:10d2a51d8f89ff4ac849888e5a9c60b10e879c30d78545ec1da4d3df7bd56ae4',
+        'com.android.tools.analytics-library:tracker:27.1.3:tracker-27.1.3.jar:589b355a2ba796cbc0a2b2295737de6661f078262e5f87cd6f540b8d011e5ebb',
         'com.android.tools.build:aapt2-proto:4.1.0-alpha01-6193524:aapt2-proto-4.1.0-alpha01-6193524.jar:17e75523e1e92dd4f222c7368ee41df9e964a508232f591e265d0c499baf9dca',
-        'com.android.tools.build:apksig:4.1.1:apksig-4.1.1.jar:e0a69da9e5a03986d608b45bbf954ef0e6a0b3f58c1b8315bd169ec08b279e72',
-        'com.android.tools.build:apkzlib:4.1.1:apkzlib-4.1.1.jar:ba4b5e419b6be0130eae7f8301c3a551ad3976f487d2e0c6852ebb175ac41127',
-        'com.android.tools.build:builder-model:4.1.1:builder-model-4.1.1.jar:e95c99cc298ad67b8deb6ced99c51abc8f59afebedad044b1a10dde14646a4dd',
-        'com.android.tools.build:builder-test-api:4.1.1:builder-test-api-4.1.1.jar:464f596ab261c051c3847406748e843770dea123f6fa5fee8a9390644e709b7a',
-        'com.android.tools.build:builder:4.1.1:builder-4.1.1.jar:0f78d4759d2f7b57b95865522ec34596ba419b9982f3b25e3449213f9c98b80d',
-        'com.android.tools.build:gradle-api:4.1.1:gradle-api-4.1.1.jar:d42e6b539e4c1353ad3546e75ec8ce11a017b97481023e8ea18577eefe374358',
-        'com.android.tools.build:manifest-merger:27.1.1:manifest-merger-27.1.1.jar:7a45fa143687859bb2e5a961dcf6ee88094d3853de0cb543dc03dbcb0f4b554b',
-        'com.android.tools.ddms:ddmlib:27.1.1:ddmlib-27.1.1.jar:da6e4bd834b6a85dae8019039849d8bd96933347dfbf460df74913ddade6e40a',
-        'com.android.tools.external.com-intellij:intellij-core:27.1.1:intellij-core-27.1.1.jar:2591a7363c4443c59bf9f793730acafce9d6ec3076e2f46716edaf53a41b6fb6',
-        'com.android.tools.external.com-intellij:kotlin-compiler:27.1.1:kotlin-compiler-27.1.1.jar:5054ae770ba788f110303c65abd6b1fa28eccf52dee1274510e201b2b81885c8',
-        'com.android.tools.external.org-jetbrains:uast:27.1.1:uast-27.1.1.jar:54cd8f6886a9d2f5641659dd5c91f626629672cd48301f7f0bd6aad9bd448714',
-        'com.android.tools.layoutlib:layoutlib-api:27.1.1:layoutlib-api-27.1.1.jar:8a9a22e3b309521ea83b724e5a89cfdac6076f52d675c0e17d77b05527bc0f8c',
-        'com.android.tools.lint:lint-api:27.1.1:lint-api-27.1.1.jar:c1d8176094cb0478786070d40533efb578ebc53529a82f6ef5bee879bdca418b',
-        'com.android.tools.lint:lint-checks:27.1.1:lint-checks-27.1.1.jar:3899c91e00bd059b40c31a9ca00cd0f8303191947608735ae1b657323693fb61',
-        'com.android.tools.lint:lint-gradle-api:27.1.1:lint-gradle-api-27.1.1.jar:26aa89d38b9825cc73229daa82a68875801c8b8491f30497ce62aff1f206eb0d',
-        'com.android.tools.lint:lint-gradle:27.1.1:lint-gradle-27.1.1.jar:f7355823ead869f4d28184ba28b7a0c693b507519a2d3705bb9848a0f35b3756',
-        'com.android.tools.lint:lint-model:27.1.1:lint-model-27.1.1.jar:bc23c0c413bdfca59dac2cd56b870d8360d009e9ec0d365e71f774bcf127971d',
-        'com.android.tools.lint:lint:27.1.1:lint-27.1.1.jar:2f6038a5398a42bd591883c3f5e5894f4ec52ca1c3683bf94fa8553c1700af81',
-        'com.android.tools:annotations:27.1.1:annotations-27.1.1.jar:ff28c504d2acb9fd1a5ffbd97ae85cf59ee18c76927525aad250509bccf2cab1',
-        'com.android.tools:common:27.1.1:common-27.1.1.jar:63d9a2a9ad6d278db319f3749b9f50bdf5457ef7020074a1bebe124e714b535c',
-        'com.android.tools:dvlib:27.1.1:dvlib-27.1.1.jar:998a54201fc1cefee5f2399215e95c42b1f64f9e1d8f4452eb8255c68ba5440f',
-        'com.android.tools:repository:27.1.1:repository-27.1.1.jar:d25b74ccabf4d876903efb375e9af6fb380d8ae0445bb74bbdcc225c1e37fa1d',
-        'com.android.tools:sdk-common:27.1.1:sdk-common-27.1.1.jar:4473ae97d0ef7061ee1de61041d5aa97405ae08e44c09cf7bb278b42e4b97c7c',
-        'com.android.tools:sdklib:27.1.1:sdklib-27.1.1.jar:08e6b83961ac9724b3c1e3d0eff971f13be6701292c77914b8794480f3391250',
-        'com.android:signflinger:4.1.1:signflinger-4.1.1.jar:0c66825988873ec2d51057fa463f54a8f18fc7326ff4530b9da363b71e97ce60',
-        'com.android:zipflinger:4.1.1:zipflinger-4.1.1.jar:0a8c3e52ac13dd031236f9fb5ba4408b1d5dcd12325a05440b36da09d8881446',
+        'com.android.tools.build:apksig:4.1.3:apksig-4.1.3.jar:a851980c678ff7a6785388b9a9e8cc094788ce3c4a985ad2b19c2028fd3c631a',
+        'com.android.tools.build:apkzlib:4.1.3:apkzlib-4.1.3.jar:475903065e7e83a8c1ba78d267c97a54dc5a04d768b535093850423d7b11f2c8',
+        'com.android.tools.build:builder-model:4.1.3:builder-model-4.1.3.jar:2624a1436c3ab39dd91d3ecf9409a594b0f89ea5cab255f2e9ff11f5ee03d274',
+        'com.android.tools.build:builder-test-api:4.1.3:builder-test-api-4.1.3.jar:3d2af66726b06b53b8d6d497efcee39ff9f77eb2f8d2cce38b31502383a40d2c',
+        'com.android.tools.build:builder:4.1.3:builder-4.1.3.jar:a40426cd6d68f6a722ef4950058c075e4547025e8c2fd78e732ad89f15176f84',
+        'com.android.tools.build:gradle-api:4.1.3:gradle-api-4.1.3.jar:11b1fb9de658bdcf9290b1c1517060d0c4d93f2b27975934989ca4ac890bc077',
+        'com.android.tools.build:manifest-merger:27.1.3:manifest-merger-27.1.3.jar:ce8d4009b1f1584777a7ffa1da3b0551dc316bc8e08112e442c352af70f46f2d',
+        'com.android.tools.ddms:ddmlib:27.1.3:ddmlib-27.1.3.jar:8f76e8236d2b9eebf26378746dad025c4c7c056a02e133dae4ddef47b283c710',
+        'com.android.tools.external.com-intellij:intellij-core:27.1.3:intellij-core-27.1.3.jar:652814fa099b4746fb6f10e19718e476952e8b5bac24e17d914f90650ad21808',
+        'com.android.tools.external.com-intellij:kotlin-compiler:27.1.3:kotlin-compiler-27.1.3.jar:8d7a78d5efd213c5e467e42bd205582aad73ffc77ee5dc18eb1361c9af72f125',
+        'com.android.tools.external.org-jetbrains:uast:27.1.3:uast-27.1.3.jar:aea53944a1ac6a05f12297b55290e8cbecfe54c4166260cfba4405823bfe1c78',
+        'com.android.tools.layoutlib:layoutlib-api:27.1.3:layoutlib-api-27.1.3.jar:23875ce0a8429f33a4e86cc358f658faa0ba9c576f5f05760e544b453d67d04b',
+        'com.android.tools.lint:lint-api:27.1.3:lint-api-27.1.3.jar:97666be32bcadacd944416ea334a9575ef8f4ad0c8f333151491ff4a7df43e1c',
+        'com.android.tools.lint:lint-checks:27.1.3:lint-checks-27.1.3.jar:b2d71ae84a31490fe9ff26c706163fe245b2aea98e3eb747214c1085df444708',
+        'com.android.tools.lint:lint-gradle-api:27.1.3:lint-gradle-api-27.1.3.jar:e54131c287a2954e6ed78a3351e5e10e35a1da2f09ac443bf44b705c71b63a4d',
+        'com.android.tools.lint:lint-gradle:27.1.3:lint-gradle-27.1.3.jar:6a79e48943649d63665db7b17dbaff7af93e94ab9b15072f1a4d90486294ee9f',
+        'com.android.tools.lint:lint-model:27.1.3:lint-model-27.1.3.jar:acb9e792db7000e38e3c3ca21a9b14f2de6549d7a3fc92a97ffba3d06345e5bf',
+        'com.android.tools.lint:lint:27.1.3:lint-27.1.3.jar:5a2e69d0901a3a476a5b2d5001de755868113145f5f6aa557750cfad5389a44b',
+        'com.android.tools:annotations:27.1.3:annotations-27.1.3.jar:904dd771883496d5dfc86619ab2555968ea4e8a29d7a5f4f7cae6fbf5429f8f5',
+        'com.android.tools:common:27.1.3:common-27.1.3.jar:17ab4728e3ea50f047dd5937f0faf35f2c5416962ed74891057087ddc328bf96',
+        'com.android.tools:dvlib:27.1.3:dvlib-27.1.3.jar:cead1c0c356cbe43e6855b0330fe09ef4bec2c72e22bdb4c6e7cf7e6b1dfbc37',
+        'com.android.tools:repository:27.1.3:repository-27.1.3.jar:99de1a178855b56b8cd91a56296f1e0a9399c445e6acc51f1d2927947cc472cb',
+        'com.android.tools:sdk-common:27.1.3:sdk-common-27.1.3.jar:b591e2aa0f1be600795f5c9e2bf81cba9b052bee452fc86c3362b5dd9e427a14',
+        'com.android.tools:sdklib:27.1.3:sdklib-27.1.3.jar:ad6c08a45fe2904d05656bdddf9f623fa5c1d16bbd7b8d6a270a0734136ae02e',
+        'com.android:signflinger:4.1.3:signflinger-4.1.3.jar:f3103b55ccdc8dd9ee2517eb26af93b904d41303726594372d0df59d51156e5c',
+        'com.android:zipflinger:4.1.3:zipflinger-4.1.3.jar:48569896c0497268308a8014c66eb0f2bace2b9e2fc9390f3012823fb86387d5',
+        '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.code.gson:gson:2.8.5:gson-2.8.5.jar:233a0149fc365c9f6edbd683cfe266b19bdc773be98eabdaf6b3c924b48e7d81',
-        'com.google.dagger:dagger-compiler:2.24:dagger-compiler-2.24.jar:3c5afb955fb188da485cb2c048eff37dce0e1530b9780a0f2f7187d16d1ccc1f',
-        'com.google.dagger:dagger-producers:2.24:dagger-producers-2.24.jar:f10f45b95191954d5d6b043fca9e62fb621d21bf70634b8f8476c7988b504c3a',
-        'com.google.dagger:dagger-spi:2.24:dagger-spi-2.24.jar:c038445d14dbcb4054e61bf49e05009edf26fce4fdc7ec1a9db544784f68e718',
-        'com.google.dagger:dagger:2.24:dagger-2.24.jar:550a6e46a6dfcdf1d764887b6090cea94f783327e50e5c73754f18facfc70b64',
+        'com.google.dagger:dagger-compiler:2.33:dagger-compiler-2.33.jar:aa8a0d8370c578fd6999802d0d90b9829377a46d2c1141e11b8f737970e7155e',
+        'com.google.dagger:dagger-producers:2.33:dagger-producers-2.33.jar:5897f0b6eef799c2adfe3ccacc58c0fb374d58acb063c3ebe5366c38a8bce5c8',
+        'com.google.dagger:dagger-spi:2.33:dagger-spi-2.33.jar:e2dcab2221b8afb9556ef0a1c83b0bd5f42552e254322a257330f754cdbbb9d4',
+        'com.google.dagger:dagger:2.33:dagger-2.33.jar:d8798c5b8cf6b125234e33af5c6293bb9f2208ce29b57924c35b8c0be7b6bdcb',
         'com.google.errorprone:error_prone_annotations:2.2.0:error_prone_annotations-2.2.0.jar:6ebd22ca1b9d8ec06d41de8d64e0596981d9607b42035f9ed374f9de271a481a',
         'com.google.errorprone:error_prone_annotations:2.3.2:error_prone_annotations-2.3.2.jar:357cd6cfb067c969226c442451502aee13800a24e950fdfde77bcdb4565a668d',
         'com.google.errorprone:javac-shaded:9-dev-r4023-3:javac-shaded-9-dev-r4023-3.jar:65bfccf60986c47fbc17c9ebab0be626afc41741e0a6ec7109e0768817a36f30',
@@ -50,7 +51,7 @@ dependencyVerification {
         'com.google.jimfs:jimfs:1.1:jimfs-1.1.jar:c4828e28d7c0a930af9387510b3bada7daa5c04d7c25a75c7b8b081f1c257ddd',
         'com.google.protobuf:protobuf-java:3.10.0:protobuf-java-3.10.0.jar:161d7d61a8cb3970891c299578702fd079646e032329d6c2cabf998d191437c9',
         'com.googlecode.json-simple:json-simple:1.1:json-simple-1.1.jar:2d9484f4c649f708f47f9a479465fc729770ee65617dca3011836602264f6439',
-        'com.squareup:javapoet:1.11.1:javapoet-1.11.1.jar:9cbf2107be499ec6e95afd36b58e3ca122a24166cdd375732e51267d64058e90',
+        'com.squareup:javapoet:1.13.0:javapoet-1.13.0.jar:4c7517e848a71b36d069d12bb3bf46a70fd4cda3105d822b0ed2e19c00b69291',
         'com.squareup:javawriter:2.5.0:javawriter-2.5.0.jar:fcfb09fb0ea0aa97d3cfe7ea792398081348e468f126b3603cb3803f240197f0',
         'com.sun.activation:javax.activation:1.2.0:javax.activation-1.2.0.jar:993302b16cd7056f21e779cc577d175a810bb4900ef73cd8fbf2b50f928ba9ce',
         'com.sun.istack:istack-commons-runtime:3.0.7:istack-commons-runtime-3.0.7.jar:6443e10ba2e259fb821d9b6becf10db5316285fc30c53cec9d7b19a3877e7fdf',
@@ -62,21 +63,21 @@ dependencyVerification {
         'javax.annotation:jsr250-api:1.0:jsr250-api-1.0.jar:a1a922d0d9b6d183ed3800dfac01d1e1eb159f0e8c6f94736931c1def54a941f',
         'javax.inject:javax.inject:1:javax.inject-1.jar:91c77044a50c481636c32d916fd89c9118a72195390452c81065080f957de7ff',
         'javax.xml.bind:jaxb-api:2.3.1:jaxb-api-2.3.1.jar:88b955a0df57880a26a74708bc34f74dcaf8ebf4e78843a28b50eae945732b06',
-        'junit:junit:4.12:junit-4.12.jar:59721f0805e223d84b90677887d9ff567dc534d7c502ca903c0c2b17f05c116a',
+        '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',
+        'net.jcip:jcip-annotations:1.0:jcip-annotations-1.0.jar:be5805392060c71474bf6c9a67a099471274d30b83eef84bfc4e0889a4f1dcc0',
         'net.ltgt.gradle.incap:incap:0.2:incap-0.2.jar:b625b9806b0f1e4bc7a2e3457119488de3cd57ea20feedd513db070a573a4ffd',
         'net.sf.jopt-simple:jopt-simple:4.9:jopt-simple-4.9.jar:26c5856e954b5f864db76f13b86919b59c6eecf9fd930b96baa8884626baf2f5',
         'net.sf.kxml:kxml2:2.3.0:kxml2-2.3.0.jar:f264dd9f79a1fde10ce5ecc53221eff24be4c9331c830b7d52f2f08a7b633de2',
-        'org.apache.ant:ant-launcher:1.9.4:ant-launcher-1.9.4.jar:7bccea20b41801ca17bcbc909a78c835d0f443f12d639c77bd6ae3d05861608d',
-        'org.apache.ant:ant:1.9.4:ant-1.9.4.jar:649ae0730251de07b8913f49286d46bba7b92d47c5f332610aa426c4f02161d8',
+        'org.apache-extras.beanshell:bsh:2.0b6:bsh-2.0b6.jar:a17955976070c0573235ee662f2794a78082758b61accffce8d3f8aedcd91047',
         'org.apache.commons:commons-compress:1.12:commons-compress-1.12.jar:2c1542faf343185b7cab9c3d55c8ae5471d6d095d3887a4adefdbdf2984dc0b6',
         'org.apache.httpcomponents:httpclient:4.5.6:httpclient-4.5.6.jar:c03f813195e7a80e3608d0ddd8da80b21696a4c92a6a2298865bf149071551c7',
         'org.apache.httpcomponents:httpcore:4.4.10:httpcore-4.4.10.jar:78ba1096561957db1b55200a159b648876430342d15d461277e62360da19f6fd',
         'org.apache.httpcomponents:httpmime:4.5.6:httpmime-4.5.6.jar:0b2b1102c18d3c7e05a77214b9b7501a6f6056174ae5604e0e256776eda7553e',
-        'org.beanshell:bsh:1.3.0:bsh-1.3.0.jar:9b04edc75d19db54f1b4e8b5355e9364384c6cf71eb0a1b9724c159d779879f8',
         'org.bouncycastle:bcpkix-jdk15on:1.56:bcpkix-jdk15on-1.56.jar:7043dee4e9e7175e93e0b36f45b1ec1ecb893c5f755667e8b916eb8dd201c6ca',
         'org.bouncycastle:bcprov-jdk15on:1.56:bcprov-jdk15on-1.56.jar:963e1ee14f808ffb99897d848ddcdb28fa91ddda867eb18d303e82728f878349',
         'org.briarproject:obfs4proxy-android:0.0.12-dev-40245c4a:obfs4proxy-android-0.0.12-dev-40245c4a.zip:8ab05a8f8391be2cb5ab2b665c281a06d9e3a756bd0f95a40a36ca927866ea82',
-        'org.briarproject:tor-android:0.3.5.13:tor-android-0.3.5.13.zip:e0978db136731dae07774b722970cdae1e462fb5adc82845dd80a7e2d87f356c',
+        'org.briarproject:tor-android:0.3.5.15:tor-android-0.3.5.15.jar:560c5070166300b396cb2f28d82d9f639ee1fb5479096a3cef67da56d39937ad',
         'org.checkerframework:checker-compat-qual:2.5.3:checker-compat-qual-2.5.3.jar:d76b9afea61c7c082908023f0cbc1427fab9abd2df915c8b8a3e7a509bccbc6d',
         'org.checkerframework:checker-qual:2.5.2:checker-qual-2.5.2.jar:64b02691c8b9d4e7700f8ee2e742dce7ea2c6e81e662b7522c9ee3bf568c040a',
         'org.checkerframework:checker-qual:2.8.1:checker-qual-2.8.1.jar:9103499008bcecd4e948da29b17864abb64304e15706444ae209d17ebe0575df',
@@ -85,26 +86,31 @@ dependencyVerification {
         'org.codehaus.mojo:animal-sniffer-annotations:1.18:animal-sniffer-annotations-1.18.jar:47f05852b48ee9baefef80fa3d8cea60efa4753c0013121dd7fe5eef2e5c729d',
         'org.glassfish.jaxb:jaxb-runtime:2.3.1:jaxb-runtime-2.3.1.jar:45fecfa5c8217ce1f3652ab95179790ec8cc0dec0384bca51cbeb94a293d9f2f',
         'org.glassfish.jaxb:txw2:2.3.1:txw2-2.3.1.jar:34975dde1c6920f1a39791142235689bc3cd357e24d05edd8ff93b885bd68d60',
-        'org.hamcrest:hamcrest-core:1.3:hamcrest-core-1.3.jar:66fdef91e9739348df7a096aa384a5685f4e875584cce89386a7a47251c4d8e9',
-        'org.hamcrest:hamcrest-library:1.3:hamcrest-library-1.3.jar:711d64522f9ec410983bd310934296da134be4254a125080a0416ec178dfad1c',
+        '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',
         'org.jetbrains.kotlin:kotlin-reflect:1.3.72:kotlin-reflect-1.3.72.jar:a188d9367de1c4ee9479db630985c0597b20709c83161b1430d24edb27e38c40',
         'org.jetbrains.kotlin:kotlin-stdlib-common:1.3.72:kotlin-stdlib-common-1.3.72.jar:5e7d1552863e480c1628b1cc39ce230ef829f5b7230106215a05acda5172203a',
+        'org.jetbrains.kotlin:kotlin-stdlib-common:1.4.20:kotlin-stdlib-common-1.4.20.jar:a7112c9b3cefee418286c9c9372f7af992bd1e6e030691d52f60cb36dbec8320',
         'org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.72:kotlin-stdlib-jdk7-1.3.72.jar:40566c0c08d414b9413ba556ff7f8a0b04b98b9f0f424d122dd2088510efccc4',
         'org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.72:kotlin-stdlib-jdk8-1.3.72.jar:133da70cfc07b56094282eac5c59bccd59f167ee2ead22e5282876d8bc10bf95',
         'org.jetbrains.kotlin:kotlin-stdlib:1.3.72:kotlin-stdlib-1.3.72.jar:3856a7349ebacd6d1be6802b2fed9c4dc2c5a564ea92b6b945ac988243d4b16b',
+        'org.jetbrains.kotlin:kotlin-stdlib:1.4.20:kotlin-stdlib-1.4.20.jar:b8ab1da5cdc89cb084d41e1f28f20a42bd431538642a5741c52bbfae3fa3e656',
+        'org.jetbrains.kotlinx:kotlinx-metadata-jvm:0.1.0:kotlinx-metadata-jvm-0.1.0.jar:9753bb39efef35957c5c15df9a3cb769aabf2cdfa74b47afcb7760e5146be3b5',
         'org.jetbrains.trove4j:trove4j:20160824:trove4j-20160824.jar:1917871c8deb468307a584680c87a44572f5a8b0b98c6d397fc0f5f86596dbe7',
         'org.jetbrains:annotations:13.0:annotations-13.0.jar:ace2a10dc8e2d5fd34925ecac03e4988b2c0f851650c94b8cef49ba1bd111478',
-        'org.jmock:jmock-junit4:2.8.2:jmock-junit4-2.8.2.jar:f7ee4df4f7bd7b7f1cafad3b99eb74d579f109d5992ff625347352edb55e674c',
-        'org.jmock:jmock-legacy:2.8.2:jmock-legacy-2.8.2.jar:f2b985a5c08a9edb7f37612330c058809da3f6a6d63ce792426ebf8ff0d6d31b',
-        'org.jmock:jmock-testjar:2.8.2:jmock-testjar-2.8.2.jar:8900860f72c474e027cf97fe78dcbf154a1aa7fc62b6845c5fb4e4f3c7bc8760',
-        'org.jmock:jmock:2.8.2:jmock-2.8.2.jar:6c73cb4a2e6dbfb61fd99c9a768539c170ab6568e57846bd60dbf19596b65b16',
+        'org.jmock:jmock-imposters:2.12.0:jmock-imposters-2.12.0.jar:3b836269745a137c9b2347e8d7c2104845b126ef04f012d6bfd94f1a7dea7b09',
+        'org.jmock:jmock-junit4:2.12.0:jmock-junit4-2.12.0.jar:3233062fc889637c151a24f1ee086bad04321ab7d8264fef279daff0fa27205b',
+        'org.jmock:jmock-legacy:2.12.0:jmock-legacy-2.12.0.jar:dea3a9cca653d082e2fe7e40232e982fe03a9984c7d67ceff24f3e03fe580dcd',
+        'org.jmock:jmock-testjar:2.12.0:jmock-testjar-2.12.0.jar:efefbcf6cd294d0e29f0c46eb2a3380d4ca4e1763ff719c69e2f2ac62f564a04',
+        'org.jmock:jmock:2.12.0:jmock-2.12.0.jar:266d07314c0cd343c46ff8a55601272de8cf406807caf55e6f313295f83d10be',
         'org.jvnet.staxex:stax-ex:1.8:stax-ex-1.8.jar:95b05d9590af4154c6513b9c5dc1fb2e55b539972ba0a9ef28e9a0c01d83ad77',
-        'org.objenesis:objenesis:2.1:objenesis-2.1.jar:c74330cc6b806c804fd37e74487b4fe5d7c2750c5e15fbc6efa13bdee1bdef80',
+        'org.objenesis:objenesis:3.0.1:objenesis-3.0.1.jar:7a8ff780b9ff48415d7c705f60030b0acaa616e7f823c98eede3b63508d4e984',
         '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:5.0.4:asm-5.0.4.jar:896618ed8ae62702521a78bc7be42b7c491a08e6920a15f89a3ecdec31e9a220',
         'org.ow2.asm:asm:7.0:asm-7.0.jar:b88ef66468b3c978ad0c97fd6e90979e56155b4ac69089ba7a44e9aa7ffe9acf',
+        'org.ow2.asm:asm:7.1:asm-7.1.jar:4ab2fa2b6d2cc9ccb1eaa05ea329c407b47b13ed2915f62f8c4b8cc96258d4de',
     ]
 }

bramble-api/build.gradle

@@ -7,13 +7,13 @@ apply plugin: 'witness'
 apply from: 'witness.gradle'
 
 dependencies {
-	implementation "com.google.dagger:dagger:2.24"
+	implementation "com.google.dagger:dagger:$dagger_version"
 	implementation 'com.google.code.findbugs:jsr305:3.0.2'
 
-	testImplementation 'junit:junit:4.12'
-	testImplementation "org.jmock:jmock:2.8.2"
-	testImplementation "org.jmock:jmock-junit4:2.8.2"
-	testImplementation "org.jmock:jmock-legacy:2.8.2"
+	testImplementation "junit:junit:$junit_version"
+	testImplementation "org.jmock:jmock:$jmock_version"
+	testImplementation "org.jmock:jmock-junit4:$jmock_version"
+	testImplementation "org.jmock:jmock-legacy:$jmock_version"
 
 	signature 'org.codehaus.mojo.signature:java16:1.1@signature'
 }

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

@@ -12,4 +12,8 @@ public interface FeatureFlags {
 	boolean shouldEnableDisappearingMessages();
 
 	boolean shouldEnableConnectViaBluetooth();
+
+	boolean shouldEnableShareAppViaOfflineHotspot();
+
+	boolean shouldEnableTransferData();
 }

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

@@ -1,23 +1,19 @@
 package org.briarproject.bramble.api.crypto;
 
+import org.briarproject.bramble.api.Bytes;
+
 /**
  * A secret key used for encryption and/or authentication.
  */
-public class SecretKey {
+public class SecretKey extends Bytes {
 
 	/**
 	 * The length of a secret key in bytes.
 	 */
 	public static final int LENGTH = 32;
 
-	private final byte[] key;
-
 	public SecretKey(byte[] key) {
+		super(key);
 		if (key.length != LENGTH) throw new IllegalArgumentException();
-		this.key = key;
-	}
-
-	public byte[] getBytes() {
-		return key;
 	}
 }

bramble-api/src/main/java/org/briarproject/bramble/api/db/DatabaseComponent.java

@@ -101,7 +101,7 @@ public interface DatabaseComponent extends TransactionManager {
 	/**
 	 * Stores a transport.
 	 */
-	void addTransport(Transaction txn, TransportId t, int maxLatency)
+	void addTransport(Transaction txn, TransportId t, long maxLatency)
 			throws DbException;
 
 	/**
@@ -128,7 +128,7 @@ public interface DatabaseComponent extends TransactionManager {
 	 * should be included
 	 */
 	boolean containsAnythingToSend(Transaction txn, ContactId c,
-			int maxLatency, boolean eager) throws DbException;
+			long maxLatency, boolean eager) throws DbException;
 
 	/**
 	 * Returns true if the database contains the given contact for the given
@@ -200,7 +200,7 @@ public interface DatabaseComponent extends TransactionManager {
 	 */
 	@Nullable
 	Collection<Message> generateBatch(Transaction txn, ContactId c,
-			int maxLength, int maxLatency) throws DbException;
+			int maxLength, long maxLatency) throws DbException;
 
 	/**
 	 * Returns a batch of messages for the given contact containing the
@@ -212,7 +212,7 @@ public interface DatabaseComponent extends TransactionManager {
 	 * exception.
 	 */
 	Collection<Message> generateBatch(Transaction txn, ContactId c,
-			Collection<MessageId> ids, int maxLatency) throws DbException;
+			Collection<MessageId> ids, long maxLatency) throws DbException;
 
 	/**
 	 * Returns an offer for the given contact for transmission over a
@@ -221,7 +221,7 @@ public interface DatabaseComponent extends TransactionManager {
 	 */
 	@Nullable
 	Offer generateOffer(Transaction txn, ContactId c, int maxMessages,
-			int maxLatency) throws DbException;
+			long maxLatency) throws DbException;
 
 	/**
 	 * Returns a request for the given contact, or null if there are no
@@ -240,7 +240,7 @@ public interface DatabaseComponent extends TransactionManager {
 	 */
 	@Nullable
 	Collection<Message> generateRequestedBatch(Transaction txn, ContactId c,
-			int maxLength, int maxLatency) throws DbException;
+			int maxLength, long maxLatency) throws DbException;
 
 	/**
 	 * Returns the contact with the given ID.

bramble-api/src/main/java/org/briarproject/bramble/api/keyagreement/event/KeyAgreementStartedEvent.java

@@ -3,7 +3,7 @@ package org.briarproject.bramble.api.keyagreement.event;
 import org.briarproject.bramble.api.event.Event;
 
 /**
- * An event that is broadcast when a BQP protocol completes.
+ * An event that is broadcast when a BQP protocol begins.
  */
 public class KeyAgreementStartedEvent extends Event {
 }

bramble-api/src/main/java/org/briarproject/bramble/api/lifecycle/LifecycleManager.java

@@ -5,6 +5,7 @@ import org.briarproject.bramble.api.db.DatabaseComponent;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.db.Transaction;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.bramble.api.system.Wakeful;
 
 import java.util.concurrent.ExecutorService;
@@ -22,6 +23,7 @@ public interface LifecycleManager {
 	 */
 	enum StartResult {
 		ALREADY_RUNNING,
+		CLOCK_ERROR,
 		DB_ERROR,
 		DATA_TOO_OLD_ERROR,
 		DATA_TOO_NEW_ERROR,
@@ -65,6 +67,10 @@ public interface LifecycleManager {
 	/**
 	 * Opens the {@link DatabaseComponent} using the given key and starts any
 	 * registered {@link Service Services}.
+	 *
+	 * @return {@link StartResult#CLOCK_ERROR} if the system clock is earlier
+	 * than {@link Clock#MIN_REASONABLE_TIME_MS} or later than
+	 * {@link Clock#MAX_REASONABLE_TIME_MS}.
 	 */
 	@Wakeful
 	StartResult startServices(SecretKey dbKey);

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

@@ -61,7 +61,7 @@ public interface Plugin {
 	/**
 	 * Returns the transport's maximum latency in milliseconds.
 	 */
-	int getMaxLatency();
+	long getMaxLatency();
 
 	/**
 	 * Returns the transport's maximum idle time in milliseconds.

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

@@ -0,0 +1,25 @@
+package org.briarproject.bramble.api.plugin;
+
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+import javax.annotation.Nullable;
+
+@NotNullByDefault
+public interface PluginFactory<P extends Plugin> {
+
+	/**
+	 * Returns the plugin's transport identifier.
+	 */
+	TransportId getId();
+
+	/**
+	 * Returns the maximum latency of the transport in milliseconds.
+	 */
+	long getMaxLatency();
+
+	/**
+	 * Creates and returns a plugin, or null if no plugin can be created.
+	 */
+	@Nullable
+	P createPlugin(PluginCallback callback);
+}

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

@@ -15,7 +15,7 @@ public interface TransportConnectionWriter {
 	/**
 	 * Returns the maximum latency of the transport in milliseconds.
 	 */
-	int getMaxLatency();
+	long getMaxLatency();
 
 	/**
 	 * Returns the maximum idle time of the transport in milliseconds.

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/duplex/AbstractDuplexTransportConnection.java

@@ -70,7 +70,7 @@ public abstract class AbstractDuplexTransportConnection
 	private class Writer implements TransportConnectionWriter {
 
 		@Override
-		public int getMaxLatency() {
+		public long getMaxLatency() {
 			return plugin.getMaxLatency();
 		}
 

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/duplex/DuplexPluginFactory.java

@@ -1,30 +1,11 @@
 package org.briarproject.bramble.api.plugin.duplex;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.plugin.PluginCallback;
-import org.briarproject.bramble.api.plugin.TransportId;
-
-import javax.annotation.Nullable;
+import org.briarproject.bramble.api.plugin.PluginFactory;
 
 /**
  * Factory for creating a plugin for a duplex transport.
  */
 @NotNullByDefault
-public interface DuplexPluginFactory {
-
-	/**
-	 * Returns the plugin's transport identifier.
-	 */
-	TransportId getId();
-
-	/**
-	 * Returns the maximum latency of the transport in milliseconds.
-	 */
-	int getMaxLatency();
-
-	/**
-	 * Creates and returns a plugin, or null if no plugin can be created.
-	 */
-	@Nullable
-	DuplexPlugin createPlugin(PluginCallback callback);
+public interface DuplexPluginFactory extends PluginFactory<DuplexPlugin> {
 }

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/file/RemovableDriveConstants.java

@@ -8,4 +8,5 @@ public interface RemovableDriveConstants {
 
 	String PROP_PATH = "path";
 	String PROP_URI = "uri";
+	String PROP_SUPPORTED = "supported";
 }

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/file/RemovableDriveManager.java

@@ -39,6 +39,12 @@ public interface RemovableDriveManager {
 	 */
 	RemovableDriveTask startWriterTask(ContactId c, TransportProperties p);
 
+	/**
+	 * Returns true if the given contact has indicated support for the
+	 * removable drive transport.
+	 */
+	boolean isTransportSupportedByContact(ContactId c) throws DbException;
+
 	/**
 	 * Returns true if there is anything to send to the given contact.
 	 */

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/simplex/SimplexPluginFactory.java

@@ -1,30 +1,11 @@
 package org.briarproject.bramble.api.plugin.simplex;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.plugin.PluginCallback;
-import org.briarproject.bramble.api.plugin.TransportId;
-
-import javax.annotation.Nullable;
+import org.briarproject.bramble.api.plugin.PluginFactory;
 
 /**
  * Factory for creating a plugin for a simplex transport.
  */
 @NotNullByDefault
-public interface SimplexPluginFactory {
-
-	/**
-	 * Returns the plugin's transport identifier.
-	 */
-	TransportId getId();
-
-	/**
-	 * Returns the maximum latency of the transport in milliseconds.
-	 */
-	int getMaxLatency();
-
-	/**
-	 * Creates and returns a plugin, or null if no plugin can be created.
-	 */
-	@Nullable
-	SimplexPlugin createPlugin(PluginCallback callback);
+public interface SimplexPluginFactory extends PluginFactory<SimplexPlugin> {
 }

bramble-api/src/main/java/org/briarproject/bramble/api/sync/SyncConstants.java

@@ -5,6 +5,7 @@ import org.briarproject.bramble.api.UniqueId;
 import java.util.List;
 
 import static java.util.Collections.singletonList;
+import static java.util.concurrent.TimeUnit.DAYS;
 import static org.briarproject.bramble.api.record.Record.MAX_RECORD_PAYLOAD_BYTES;
 
 public interface SyncConstants {
@@ -55,4 +56,9 @@ public interface SyncConstants {
 	 * connections.
 	 */
 	int PRIORITY_NONCE_BYTES = 16;
+
+	/**
+	 * The maximum allowed latency for any transport, in milliseconds.
+	 */
+	long MAX_TRANSPORT_LATENCY = DAYS.toMillis(365);
 }

bramble-api/src/main/java/org/briarproject/bramble/api/sync/SyncSessionFactory.java

@@ -16,9 +16,9 @@ public interface SyncSessionFactory {
 			PriorityHandler handler);
 
 	SyncSession createSimplexOutgoingSession(ContactId c, TransportId t,
-			int maxLatency, boolean eager, StreamWriter streamWriter);
+			long maxLatency, boolean eager, StreamWriter streamWriter);
 
 	SyncSession createDuplexOutgoingSession(ContactId c, TransportId t,
-			int maxLatency, int maxIdleTime, StreamWriter streamWriter,
+			long maxLatency, int maxIdleTime, StreamWriter streamWriter,
 			@Nullable Priority priority);
 }

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

@@ -6,6 +6,22 @@ package org.briarproject.bramble.api.system;
  */
 public interface Clock {
 
+	/**
+	 * The minimum reasonable value for the system clock, in milliseconds
+	 * since the Unix epoch.
+	 * <p/>
+	 * 1 Jan 2021, 00:00:00 UTC
+	 */
+	long MIN_REASONABLE_TIME_MS = 1_609_459_200_000L;
+
+	/**
+	 * The maximum reasonable value for the system clock, in milliseconds
+	 * since the Unix epoch.
+	 * <p/>
+	 * 1 Jan 2121, 00:00:00 UTC
+	 */
+	long MAX_REASONABLE_TIME_MS = 4_765_132_800_000L;
+
 	/**
 	 * @see System#currentTimeMillis()
 	 */

bramble-api/src/test/java/org/briarproject/bramble/test/TestUtils.java

@@ -163,10 +163,15 @@ public class TestUtils {
 
 	public static Message getMessage(GroupId groupId) {
 		int bodyLength = 1 + random.nextInt(MAX_MESSAGE_BODY_LENGTH);
-		return getMessage(groupId, bodyLength);
+		return getMessage(groupId, bodyLength, timestamp);
 	}
 
 	public static Message getMessage(GroupId groupId, int bodyLength) {
+		return getMessage(groupId, bodyLength, timestamp);
+	}
+
+	public static Message getMessage(GroupId groupId, int bodyLength,
+			long timestamp) {
 		MessageId id = new MessageId(getRandomId());
 		byte[] body = getRandomBytes(bodyLength);
 		return new Message(id, groupId, timestamp, body);

bramble-api/witness.gradle

@@ -1,24 +1,27 @@
 dependencyVerification {
     verify = [
-        'cglib:cglib:3.2.0:cglib-3.2.0.jar:adb13bab79712ad6bdf1bd59f2a3918018a8016e722e8a357065afb9e6690861',
+        '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',
-        'com.google.dagger:dagger:2.24:dagger-2.24.jar:550a6e46a6dfcdf1d764887b6090cea94f783327e50e5c73754f18facfc70b64',
+        'com.google.dagger:dagger:2.33:dagger-2.33.jar:d8798c5b8cf6b125234e33af5c6293bb9f2208ce29b57924c35b8c0be7b6bdcb',
         'javax.inject:javax.inject:1:javax.inject-1.jar:91c77044a50c481636c32d916fd89c9118a72195390452c81065080f957de7ff',
-        'junit:junit:4.12:junit-4.12.jar:59721f0805e223d84b90677887d9ff567dc534d7c502ca903c0c2b17f05c116a',
-        'org.apache.ant:ant-launcher:1.9.4:ant-launcher-1.9.4.jar:7bccea20b41801ca17bcbc909a78c835d0f443f12d639c77bd6ae3d05861608d',
-        'org.apache.ant:ant:1.9.4:ant-1.9.4.jar:649ae0730251de07b8913f49286d46bba7b92d47c5f332610aa426c4f02161d8',
-        'org.beanshell:bsh:1.3.0:bsh-1.3.0.jar:9b04edc75d19db54f1b4e8b5355e9364384c6cf71eb0a1b9724c159d779879f8',
+        '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',
+        'net.jcip:jcip-annotations:1.0:jcip-annotations-1.0.jar:be5805392060c71474bf6c9a67a099471274d30b83eef84bfc4e0889a4f1dcc0',
+        'org.apache-extras.beanshell:bsh:2.0b6:bsh-2.0b6.jar:a17955976070c0573235ee662f2794a78082758b61accffce8d3f8aedcd91047',
         'org.codehaus.mojo.signature:java16:1.1:java16-1.1.signature:53799223a2c98dba2d0add810bed76315460df285c69e4f397ae6098f87dd619',
         'org.codehaus.mojo:animal-sniffer-ant-tasks:1.16:animal-sniffer-ant-tasks-1.16.jar:890040976fbe2d584619a6a61b1fd2e925b3b5eb342a85eb2762c467c0d64e90',
         'org.codehaus.mojo:animal-sniffer:1.16:animal-sniffer-1.16.jar:72be8bcc226ba43b937c722a08a07852bfa1b11400089265d5df0ee7b38b1d52',
-        'org.hamcrest:hamcrest-core:1.3:hamcrest-core-1.3.jar:66fdef91e9739348df7a096aa384a5685f4e875584cce89386a7a47251c4d8e9',
-        'org.hamcrest:hamcrest-library:1.3:hamcrest-library-1.3.jar:711d64522f9ec410983bd310934296da134be4254a125080a0416ec178dfad1c',
-        'org.jmock:jmock-junit4:2.8.2:jmock-junit4-2.8.2.jar:f7ee4df4f7bd7b7f1cafad3b99eb74d579f109d5992ff625347352edb55e674c',
-        'org.jmock:jmock-legacy:2.8.2:jmock-legacy-2.8.2.jar:f2b985a5c08a9edb7f37612330c058809da3f6a6d63ce792426ebf8ff0d6d31b',
-        'org.jmock:jmock-testjar:2.8.2:jmock-testjar-2.8.2.jar:8900860f72c474e027cf97fe78dcbf154a1aa7fc62b6845c5fb4e4f3c7bc8760',
-        'org.jmock:jmock:2.8.2:jmock-2.8.2.jar:6c73cb4a2e6dbfb61fd99c9a768539c170ab6568e57846bd60dbf19596b65b16',
-        'org.objenesis:objenesis:2.1:objenesis-2.1.jar:c74330cc6b806c804fd37e74487b4fe5d7c2750c5e15fbc6efa13bdee1bdef80',
+        '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',
+        'org.jmock:jmock-imposters:2.12.0:jmock-imposters-2.12.0.jar:3b836269745a137c9b2347e8d7c2104845b126ef04f012d6bfd94f1a7dea7b09',
+        'org.jmock:jmock-junit4:2.12.0:jmock-junit4-2.12.0.jar:3233062fc889637c151a24f1ee086bad04321ab7d8264fef279daff0fa27205b',
+        'org.jmock:jmock-legacy:2.12.0:jmock-legacy-2.12.0.jar:dea3a9cca653d082e2fe7e40232e982fe03a9984c7d67ceff24f3e03fe580dcd',
+        'org.jmock:jmock-testjar:2.12.0:jmock-testjar-2.12.0.jar:efefbcf6cd294d0e29f0c46eb2a3380d4ca4e1763ff719c69e2f2ac62f564a04',
+        '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-all:5.2:asm-all-5.2.jar:7fbffbc1db3422e2101689fd88df8384b15817b52b9b2b267b9f6d2511dc198d',
-        'org.ow2.asm:asm:5.0.4:asm-5.0.4.jar:896618ed8ae62702521a78bc7be42b7c491a08e6920a15f89a3ecdec31e9a220',
+        'org.ow2.asm:asm:7.1:asm-7.1.jar:4ab2fa2b6d2cc9ccb1eaa05ea329c407b47b13ed2915f62f8c4b8cc96258d4de',
     ]
 }

bramble-core/build.gradle

@@ -17,16 +17,17 @@ dependencies {
 	implementation 'org.whispersystems:curve25519-java:0.5.0'
 	implementation 'org.briarproject:jtorctl:0.3'
 
-	annotationProcessor 'com.google.dagger:dagger-compiler:2.24'
+	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 'junit:junit:4.12'
-	testImplementation "org.jmock:jmock:2.8.2"
-	testImplementation "org.jmock:jmock-junit4:2.8.2"
-	testImplementation "org.jmock:jmock-legacy:2.8.2"
+	testImplementation 'net.jodah:concurrentunit:0.4.2'
+	testImplementation "junit:junit:$junit_version"
+	testImplementation "org.jmock:jmock:$jmock_version"
+	testImplementation "org.jmock:jmock-junit4:$jmock_version"
+	testImplementation "org.jmock:jmock-legacy:$jmock_version"
 
-	testAnnotationProcessor 'com.google.dagger:dagger-compiler:2.24'
+	testAnnotationProcessor "com.google.dagger:dagger-compiler:$dagger_version"
 
 	signature 'org.codehaus.mojo.signature:java16:1.1@signature'
 }

bramble-core/src/main/java/org/briarproject/bramble/connection/Connection.java

@@ -45,7 +45,6 @@ abstract class Connection {
 	@Nullable
 	StreamContext recogniseTag(TransportConnectionReader reader,
 			TransportId transportId) {
-		StreamContext ctx;
 		try {
 			byte[] tag = readTag(reader.getInputStream());
 			return keyManager.getStreamContext(transportId, tag);

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

@@ -47,6 +47,7 @@ import javax.inject.Inject;
 
 import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.api.identity.AuthorConstants.MAX_SIGNATURE_LENGTH;
+import static org.briarproject.bramble.api.system.Clock.MIN_REASONABLE_TIME_MS;
 import static org.briarproject.bramble.contact.ContactExchangeConstants.PROTOCOL_VERSION;
 import static org.briarproject.bramble.contact.ContactExchangeRecordTypes.CONTACT_INFO;
 import static org.briarproject.bramble.util.ValidationUtils.checkLength;
@@ -184,6 +185,10 @@ class ContactExchangeManagerImpl implements ContactExchangeManager {
 
 		// The agreed timestamp is the minimum of the peers' timestamps
 		long timestamp = Math.min(localTimestamp, remoteInfo.timestamp);
+		if (timestamp < MIN_REASONABLE_TIME_MS) {
+			LOG.warning("Timestamp is too old");
+			throw new FormatException();
+		}
 
 		// Add the contact
 		Contact contact = addContact(p, remoteInfo.author, localAuthor,

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

@@ -145,7 +145,7 @@ interface Database<T> {
 	/**
 	 * Stores a transport.
 	 */
-	void addTransport(T txn, TransportId t, int maxLatency)
+	void addTransport(T txn, TransportId t, long maxLatency)
 			throws DbException;
 
 	/**
@@ -171,7 +171,7 @@ interface Database<T> {
 	 * @param eager True if messages that are not yet due for retransmission
 	 * should be included
 	 */
-	boolean containsAnythingToSend(T txn, ContactId c, int maxLatency,
+	boolean containsAnythingToSend(T txn, ContactId c, long maxLatency,
 			boolean eager) throws DbException;
 
 	/**
@@ -483,7 +483,7 @@ interface Database<T> {
 	 * Read-only.
 	 */
 	Collection<MessageId> getMessagesToOffer(T txn, ContactId c,
-			int maxMessages, int maxLatency) throws DbException;
+			int maxMessages, long maxLatency) throws DbException;
 
 	/**
 	 * Returns the IDs of some messages that are eligible to be requested from
@@ -505,13 +505,13 @@ interface Database<T> {
 	 * Read-only.
 	 */
 	Collection<MessageId> getMessagesToSend(T txn, ContactId c, int maxLength,
-			int maxLatency) throws DbException;
+			long maxLatency) throws DbException;
 
 	/**
 	 * Returns the IDs of all messages that are eligible to be sent to the
 	 * given contact, together with their raw lengths.
 	 * <p/>
-	 * Unlike {@link #getMessagesToSend(Object, ContactId, int, int)} this
+	 * Unlike {@link #getMessagesToSend(Object, ContactId, int, long)} this
 	 * method may return messages that have already been sent and are not yet
 	 * due for retransmission.
 	 * <p/>
@@ -604,7 +604,7 @@ interface Database<T> {
 	 * Read-only.
 	 */
 	Collection<MessageId> getRequestedMessagesToSend(T txn, ContactId c,
-			int maxLength, int maxLatency) throws DbException;
+			int maxLength, long maxLatency) throws DbException;
 
 	/**
 	 * Returns all settings in the given namespace.
@@ -845,7 +845,7 @@ interface Database<T> {
 	 * of the given message with respect to the given contact, using the latency
 	 * of the transport over which it was sent.
 	 */
-	void updateExpiryTimeAndEta(T txn, ContactId c, MessageId m, int maxLatency)
+	void updateExpiryTimeAndEta(T txn, ContactId c, MessageId m, long maxLatency)
 			throws DbException;
 
 	/**

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

@@ -310,7 +310,7 @@ class DatabaseComponentImpl<T> implements DatabaseComponent {
 
 	@Override
 	public void addTransport(Transaction transaction, TransportId t,
-			int maxLatency) throws DbException {
+			long maxLatency) throws DbException {
 		if (transaction.isReadOnly()) throw new IllegalArgumentException();
 		T txn = unbox(transaction);
 		if (!db.containsTransport(txn, t))
@@ -343,7 +343,7 @@ class DatabaseComponentImpl<T> implements DatabaseComponent {
 
 	@Override
 	public boolean containsAnythingToSend(Transaction transaction, ContactId c,
-			int maxLatency, boolean eager) throws DbException {
+			long maxLatency, boolean eager) throws DbException {
 		T txn = unbox(transaction);
 		if (!db.containsContact(txn, c))
 			throw new NoSuchContactException();
@@ -424,7 +424,7 @@ class DatabaseComponentImpl<T> implements DatabaseComponent {
 	@Nullable
 	@Override
 	public Collection<Message> generateBatch(Transaction transaction,
-			ContactId c, int maxLength, int maxLatency) throws DbException {
+			ContactId c, int maxLength, long maxLatency) throws DbException {
 		if (transaction.isReadOnly()) throw new IllegalArgumentException();
 		T txn = unbox(transaction);
 		if (!db.containsContact(txn, c))
@@ -447,7 +447,7 @@ class DatabaseComponentImpl<T> implements DatabaseComponent {
 
 	@Override
 	public Collection<Message> generateBatch(Transaction transaction,
-			ContactId c, Collection<MessageId> ids, int maxLatency)
+			ContactId c, Collection<MessageId> ids, long maxLatency)
 			throws DbException {
 		if (transaction.isReadOnly()) throw new IllegalArgumentException();
 		T txn = unbox(transaction);
@@ -474,7 +474,7 @@ class DatabaseComponentImpl<T> implements DatabaseComponent {
 	@Nullable
 	@Override
 	public Offer generateOffer(Transaction transaction, ContactId c,
-			int maxMessages, int maxLatency) throws DbException {
+			int maxMessages, long maxLatency) throws DbException {
 		if (transaction.isReadOnly()) throw new IllegalArgumentException();
 		T txn = unbox(transaction);
 		if (!db.containsContact(txn, c))
@@ -505,7 +505,7 @@ class DatabaseComponentImpl<T> implements DatabaseComponent {
 	@Nullable
 	@Override
 	public Collection<Message> generateRequestedBatch(Transaction transaction,
-			ContactId c, int maxLength, int maxLatency) throws DbException {
+			ContactId c, int maxLength, long maxLatency) throws DbException {
 		if (transaction.isReadOnly()) throw new IllegalArgumentException();
 		T txn = unbox(transaction);
 		if (!db.containsContact(txn, c))

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

@@ -1,5 +1,7 @@
 package org.briarproject.bramble.db;
 
+import static org.briarproject.bramble.api.sync.SyncConstants.MAX_TRANSPORT_LATENCY;
+
 class ExponentialBackoff {
 
 	/**
@@ -11,9 +13,11 @@ class ExponentialBackoff {
 	 * transmissions increases exponentially. If the expiry time would
 	 * be greater than Long.MAX_VALUE, Long.MAX_VALUE is returned.
 	 */
-	static long calculateExpiry(long now, int maxLatency, int txCount) {
+	static long calculateExpiry(long now, long maxLatency, int txCount) {
 		if (now < 0) throw new IllegalArgumentException();
-		if (maxLatency <= 0) throw new IllegalArgumentException();
+		if (maxLatency <= 0 || maxLatency > MAX_TRANSPORT_LATENCY) {
+			throw new IllegalArgumentException();
+		}
 		if (txCount < 0) throw new IllegalArgumentException();
 		// The maximum round-trip time is twice the maximum latency
 		long roundTrip = maxLatency * 2L;

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

@@ -102,7 +102,7 @@ import static org.briarproject.bramble.util.LogUtils.now;
 abstract class JdbcDatabase implements Database<Connection> {
 
 	// Package access for testing
-	static final int CODE_SCHEMA_VERSION = 48;
+	static final int CODE_SCHEMA_VERSION = 49;
 
 	// Time period offsets for incoming transport keys
 	private static final int OFFSET_PREV = -1;
@@ -267,7 +267,7 @@ abstract class JdbcDatabase implements Database<Connection> {
 	private static final String CREATE_TRANSPORTS =
 			"CREATE TABLE transports"
 					+ " (transportId _STRING NOT NULL,"
-					+ " maxLatency INT NOT NULL,"
+					+ " maxLatency BIGINT NOT NULL,"
 					+ " PRIMARY KEY (transportId))";
 
 	private static final String CREATE_PENDING_CONTACTS =
@@ -498,7 +498,8 @@ abstract class JdbcDatabase implements Database<Connection> {
 				new Migration44_45(),
 				new Migration45_46(),
 				new Migration46_47(dbTypes),
-				new Migration47_48()
+				new Migration47_48(),
+				new Migration48_49()
 		);
 	}
 
@@ -1006,7 +1007,7 @@ abstract class JdbcDatabase implements Database<Connection> {
 	}
 
 	@Override
-	public void addTransport(Connection txn, TransportId t, int maxLatency)
+	public void addTransport(Connection txn, TransportId t, long maxLatency)
 			throws DbException {
 		PreparedStatement ps = null;
 		try {
@@ -1129,7 +1130,7 @@ abstract class JdbcDatabase implements Database<Connection> {
 
 	@Override
 	public boolean containsAnythingToSend(Connection txn, ContactId c,
-			int maxLatency, boolean eager) throws DbException {
+			long maxLatency, boolean eager) throws DbException {
 		PreparedStatement ps = null;
 		ResultSet rs = null;
 		try {
@@ -2188,7 +2189,7 @@ abstract class JdbcDatabase implements Database<Connection> {
 
 	@Override
 	public Collection<MessageId> getMessagesToOffer(Connection txn,
-			ContactId c, int maxMessages, int maxLatency) throws DbException {
+			ContactId c, int maxMessages, long maxLatency) throws DbException {
 		long now = clock.currentTimeMillis();
 		long eta = now + maxLatency;
 		PreparedStatement ps = null;
@@ -2247,7 +2248,7 @@ abstract class JdbcDatabase implements Database<Connection> {
 
 	@Override
 	public Collection<MessageId> getMessagesToSend(Connection txn, ContactId c,
-			int maxLength, int maxLatency) throws DbException {
+			int maxLength, long maxLatency) throws DbException {
 		long now = clock.currentTimeMillis();
 		long eta = now + maxLatency;
 		PreparedStatement ps = null;
@@ -2546,7 +2547,7 @@ abstract class JdbcDatabase implements Database<Connection> {
 
 	@Override
 	public Collection<MessageId> getRequestedMessagesToSend(Connection txn,
-			ContactId c, int maxLength, int maxLatency) throws DbException {
+			ContactId c, int maxLength, long maxLatency) throws DbException {
 		long now = clock.currentTimeMillis();
 		long eta = now + maxLatency;
 		PreparedStatement ps = null;
@@ -3617,7 +3618,7 @@ abstract class JdbcDatabase implements Database<Connection> {
 
 	@Override
 	public void updateExpiryTimeAndEta(Connection txn, ContactId c, MessageId m,
-			int maxLatency) throws DbException {
+			long maxLatency) throws DbException {
 		PreparedStatement ps = null;
 		ResultSet rs = null;
 		try {

bramble-core/src/main/java/org/briarproject/bramble/db/Migration48_49.java

@@ -0,0 +1,41 @@
+package org.briarproject.bramble.db;
+
+import org.briarproject.bramble.api.db.DbException;
+
+import java.sql.Connection;
+import java.sql.SQLException;
+import java.sql.Statement;
+import java.util.logging.Logger;
+
+import static java.util.logging.Level.WARNING;
+import static java.util.logging.Logger.getLogger;
+import static org.briarproject.bramble.db.JdbcUtils.tryToClose;
+
+class Migration48_49 implements Migration<Connection> {
+
+	private static final Logger LOG = getLogger(Migration48_49.class.getName());
+
+	@Override
+	public int getStartVersion() {
+		return 48;
+	}
+
+	@Override
+	public int getEndVersion() {
+		return 49;
+	}
+
+	@Override
+	public void migrate(Connection txn) throws DbException {
+		Statement s = null;
+		try {
+			s = txn.createStatement();
+			s.execute("ALTER TABLE transports"
+					+ " ALTER COLUMN maxLatency"
+					+ " SET DATA TYPE BIGINT");
+		} catch (SQLException e) {
+			tryToClose(s, LOG, WARNING);
+			throw new DbException(e);
+		}
+	}
+}

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

@@ -12,6 +12,7 @@ import org.briarproject.bramble.api.lifecycle.Service;
 import org.briarproject.bramble.api.lifecycle.ServiceException;
 import org.briarproject.bramble.api.lifecycle.event.LifecycleEvent;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.api.system.Clock;
 
 import java.util.List;
 import java.util.concurrent.CopyOnWriteArrayList;
@@ -34,11 +35,14 @@ import static org.briarproject.bramble.api.lifecycle.LifecycleManager.LifecycleS
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.LifecycleState.STARTING_SERVICES;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.LifecycleState.STOPPING;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.StartResult.ALREADY_RUNNING;
+import static org.briarproject.bramble.api.lifecycle.LifecycleManager.StartResult.CLOCK_ERROR;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.StartResult.DATA_TOO_NEW_ERROR;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.StartResult.DATA_TOO_OLD_ERROR;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.StartResult.DB_ERROR;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.StartResult.SERVICE_ERROR;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.StartResult.SUCCESS;
+import static org.briarproject.bramble.api.system.Clock.MAX_REASONABLE_TIME_MS;
+import static org.briarproject.bramble.api.system.Clock.MIN_REASONABLE_TIME_MS;
 import static org.briarproject.bramble.util.LogUtils.logDuration;
 import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.bramble.util.LogUtils.now;
@@ -52,6 +56,7 @@ class LifecycleManagerImpl implements LifecycleManager, MigrationListener {
 
 	private final DatabaseComponent db;
 	private final EventBus eventBus;
+	private final Clock clock;
 	private final List<Service> services;
 	private final List<OpenDatabaseHook> openDatabaseHooks;
 	private final List<ExecutorService> executors;
@@ -63,9 +68,11 @@ class LifecycleManagerImpl implements LifecycleManager, MigrationListener {
 	private volatile LifecycleState state = STARTING;
 
 	@Inject
-	LifecycleManagerImpl(DatabaseComponent db, EventBus eventBus) {
+	LifecycleManagerImpl(DatabaseComponent db, EventBus eventBus,
+			Clock clock) {
 		this.db = db;
 		this.eventBus = eventBus;
+		this.clock = clock;
 		services = new CopyOnWriteArrayList<>();
 		openDatabaseHooks = new CopyOnWriteArrayList<>();
 		executors = new CopyOnWriteArrayList<>();
@@ -99,6 +106,13 @@ class LifecycleManagerImpl implements LifecycleManager, MigrationListener {
 			LOG.info("Already starting or stopping");
 			return ALREADY_RUNNING;
 		}
+		long now = clock.currentTimeMillis();
+		if (now < MIN_REASONABLE_TIME_MS || now > MAX_REASONABLE_TIME_MS) {
+			if (LOG.isLoggable(WARNING)) {
+				LOG.warning("System clock is unreasonable: " + now);
+			}
+			return CLOCK_ERROR;
+		}
 		try {
 			LOG.info("Opening database");
 			long start = now();

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

@@ -79,7 +79,8 @@ abstract class AbstractBluetoothPlugin<S, SS> implements BluetoothPlugin,
 	private final SecureRandom secureRandom;
 	private final Backoff backoff;
 	private final PluginCallback callback;
-	private final int maxLatency, maxIdleTime;
+	private final long maxLatency;
+	private final int maxIdleTime;
 	private final AtomicBoolean used = new AtomicBoolean(false);
 	private final AtomicBoolean everConnected = new AtomicBoolean(false);
 
@@ -121,7 +122,7 @@ abstract class AbstractBluetoothPlugin<S, SS> implements BluetoothPlugin,
 			SecureRandom secureRandom,
 			Backoff backoff,
 			PluginCallback callback,
-			int maxLatency,
+			long maxLatency,
 			int maxIdleTime) {
 		this.connectionLimiter = connectionLimiter;
 		this.connectionFactory = connectionFactory;
@@ -158,7 +159,7 @@ abstract class AbstractBluetoothPlugin<S, SS> implements BluetoothPlugin,
 	}
 
 	@Override
-	public int getMaxLatency() {
+	public long getMaxLatency() {
 		return maxLatency;
 	}
 
@@ -473,6 +474,16 @@ abstract class AbstractBluetoothPlugin<S, SS> implements BluetoothPlugin,
 		return discoverSemaphore.availablePermits() == 0;
 	}
 
+	@Override
+	public void disablePolling() {
+		connectionLimiter.startLimiting();
+	}
+
+	@Override
+	public void enablePolling() {
+		connectionLimiter.endLimiting();
+	}
+
 	@Override
 	public DuplexTransportConnection discoverAndConnectForSetup(String uuid) {
 		DuplexTransportConnection conn = discoverAndConnect(uuid);
@@ -501,9 +512,9 @@ abstract class AbstractBluetoothPlugin<S, SS> implements BluetoothPlugin,
 			if (s.getNamespace().equals(ID.getString()))
 				ioExecutor.execute(() -> onSettingsUpdated(s.getSettings()));
 		} else if (e instanceof KeyAgreementListeningEvent) {
-			ioExecutor.execute(connectionLimiter::keyAgreementStarted);
+			connectionLimiter.startLimiting();
 		} else if (e instanceof KeyAgreementStoppedListeningEvent) {
-			ioExecutor.execute(connectionLimiter::keyAgreementEnded);
+			connectionLimiter.endLimiting();
 		} else if (e instanceof RemoteTransportPropertiesUpdatedEvent) {
 			RemoteTransportPropertiesUpdatedEvent r =
 					(RemoteTransportPropertiesUpdatedEvent) e;

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

@@ -7,14 +7,15 @@ import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
 interface BluetoothConnectionLimiter {
 
 	/**
-	 * Informs the limiter that key agreement has started.
+	 * Tells the limiter to not allow regular polling connections (because we
+	 * are about to do key agreement, or connect via BT for setup).
 	 */
-	void keyAgreementStarted();
+	void startLimiting();
 
 	/**
-	 * Informs the limiter that key agreement has ended.
+	 * Tells the limiter to no longer limit regular polling connections.
 	 */
-	void keyAgreementEnded();
+	void endLimiting();
 
 	/**
 	 * Returns true if a contact connection can be opened. This method does not

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

@@ -30,34 +30,37 @@ class BluetoothConnectionLimiterImpl implements BluetoothConnectionLimiter {
 	private final List<DuplexTransportConnection> connections =
 			new LinkedList<>();
 	@GuardedBy("lock")
-	private boolean keyAgreementInProgress = false;
+	private int limitingInProgress = 0;
 
 	BluetoothConnectionLimiterImpl(EventBus eventBus) {
 		this.eventBus = eventBus;
 	}
 
 	@Override
-	public void keyAgreementStarted() {
+	public void startLimiting() {
 		synchronized (lock) {
-			keyAgreementInProgress = true;
+			limitingInProgress++;
 		}
-		LOG.info("Key agreement started");
+		LOG.info("Limiting started");
 		eventBus.broadcast(new CloseSyncConnectionsEvent(ID));
 	}
 
 	@Override
-	public void keyAgreementEnded() {
+	public void endLimiting() {
 		synchronized (lock) {
-			keyAgreementInProgress = false;
+			limitingInProgress--;
+			if (limitingInProgress < 0) {
+				throw new IllegalStateException();
+			}
 		}
-		LOG.info("Key agreement ended");
+		LOG.info("Limiting ended");
 	}
 
 	@Override
 	public boolean canOpenContactConnection() {
 		synchronized (lock) {
-			if (keyAgreementInProgress) {
-				LOG.info("Can't open contact connection during key agreement");
+			if (limitingInProgress > 0) {
+				LOG.info("Can't open contact connection while limiting");
 				return false;
 			} else {
 				LOG.info("Can open contact connection");

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

@@ -11,6 +11,10 @@ public interface BluetoothPlugin extends DuplexPlugin {
 
 	boolean isDiscovering();
 
+	void disablePolling();
+
+	void enablePolling();
+
 	@Nullable
 	DuplexTransportConnection discoverAndConnectForSetup(String uuid);
 

bramble-core/src/main/java/org/briarproject/bramble/plugin/file/AbstractRemovableDrivePlugin.java

@@ -3,6 +3,7 @@ package org.briarproject.bramble.plugin.file;
 import org.briarproject.bramble.api.Pair;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.ConnectionHandler;
+import org.briarproject.bramble.api.plugin.PluginCallback;
 import org.briarproject.bramble.api.plugin.TransportConnectionReader;
 import org.briarproject.bramble.api.plugin.TransportConnectionWriter;
 import org.briarproject.bramble.api.plugin.TransportId;
@@ -17,10 +18,12 @@ import java.util.logging.Logger;
 
 import javax.annotation.concurrent.Immutable;
 
+import static java.util.Collections.singletonMap;
 import static java.util.logging.Level.WARNING;
 import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.api.plugin.Plugin.State.ACTIVE;
 import static org.briarproject.bramble.api.plugin.file.RemovableDriveConstants.ID;
+import static org.briarproject.bramble.api.plugin.file.RemovableDriveConstants.PROP_SUPPORTED;
 import static org.briarproject.bramble.util.LogUtils.logException;
 
 @Immutable
@@ -30,7 +33,8 @@ abstract class AbstractRemovableDrivePlugin implements SimplexPlugin {
 	private static final Logger LOG =
 			getLogger(AbstractRemovableDrivePlugin.class.getName());
 
-	private final int maxLatency;
+	private final long maxLatency;
+	private final PluginCallback callback;
 
 	abstract InputStream openInputStream(TransportProperties p)
 			throws IOException;
@@ -38,7 +42,8 @@ abstract class AbstractRemovableDrivePlugin implements SimplexPlugin {
 	abstract OutputStream openOutputStream(TransportProperties p)
 			throws IOException;
 
-	AbstractRemovableDrivePlugin(int maxLatency) {
+	AbstractRemovableDrivePlugin(PluginCallback callback, long maxLatency) {
+		this.callback = callback;
 		this.maxLatency = maxLatency;
 	}
 
@@ -48,7 +53,7 @@ abstract class AbstractRemovableDrivePlugin implements SimplexPlugin {
 	}
 
 	@Override
-	public int getMaxLatency() {
+	public long getMaxLatency() {
 		return maxLatency;
 	}
 
@@ -60,6 +65,8 @@ abstract class AbstractRemovableDrivePlugin implements SimplexPlugin {
 
 	@Override
 	public void start() {
+		callback.mergeLocalProperties(
+				new TransportProperties(singletonMap(PROP_SUPPORTED, "true")));
 	}
 
 	@Override

bramble-core/src/main/java/org/briarproject/bramble/plugin/file/FilePlugin.java

@@ -27,20 +27,20 @@ abstract class FilePlugin implements SimplexPlugin {
 			getLogger(FilePlugin.class.getName());
 
 	protected final PluginCallback callback;
-	protected final int maxLatency;
+	protected final long maxLatency;
 
 	protected abstract void writerFinished(File f, boolean exception);
 
 	protected abstract void readerFinished(File f, boolean exception,
 			boolean recognised);
 
-	FilePlugin(PluginCallback callback, int maxLatency) {
+	FilePlugin(PluginCallback callback, long maxLatency) {
 		this.callback = callback;
 		this.maxLatency = maxLatency;
 	}
 
 	@Override
-	public int getMaxLatency() {
+	public long getMaxLatency() {
 		return maxLatency;
 	}
 

bramble-core/src/main/java/org/briarproject/bramble/plugin/file/FileTransportWriter.java

@@ -27,7 +27,7 @@ class FileTransportWriter implements TransportConnectionWriter {
 	}
 
 	@Override
-	public int getMaxLatency() {
+	public long getMaxLatency() {
 		return plugin.getMaxLatency();
 	}
 

bramble-core/src/main/java/org/briarproject/bramble/plugin/file/RemovableDriveManagerImpl.java

@@ -8,6 +8,8 @@ import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.file.RemovableDriveManager;
 import org.briarproject.bramble.api.plugin.file.RemovableDriveTask;
 import org.briarproject.bramble.api.properties.TransportProperties;
+import org.briarproject.bramble.api.properties.TransportPropertyManager;
+import org.briarproject.bramble.api.transport.KeyManager;
 
 import java.util.concurrent.Executor;
 
@@ -16,6 +18,8 @@ import javax.annotation.concurrent.GuardedBy;
 import javax.annotation.concurrent.ThreadSafe;
 import javax.inject.Inject;
 
+import static org.briarproject.bramble.api.plugin.file.RemovableDriveConstants.ID;
+import static org.briarproject.bramble.api.plugin.file.RemovableDriveConstants.PROP_SUPPORTED;
 import static org.briarproject.bramble.plugin.file.RemovableDrivePluginFactory.MAX_LATENCY;
 
 @ThreadSafe
@@ -25,19 +29,29 @@ class RemovableDriveManagerImpl
 
 	private final Executor ioExecutor;
 	private final DatabaseComponent db;
+	private final KeyManager keyManager;
+	private final TransportPropertyManager transportPropertyManager;
 	private final RemovableDriveTaskFactory taskFactory;
 	private final Object lock = new Object();
 
 	@GuardedBy("lock")
+	@Nullable
 	private RemovableDriveTask reader = null;
 	@GuardedBy("lock")
+	@Nullable
 	private RemovableDriveTask writer = null;
 
 	@Inject
-	RemovableDriveManagerImpl(@IoExecutor Executor ioExecutor,
-			DatabaseComponent db, RemovableDriveTaskFactory taskFactory) {
+	RemovableDriveManagerImpl(
+			@IoExecutor Executor ioExecutor,
+			DatabaseComponent db,
+			KeyManager keyManager,
+			TransportPropertyManager transportPropertyManager,
+			RemovableDriveTaskFactory taskFactory) {
 		this.ioExecutor = ioExecutor;
 		this.db = db;
+		this.keyManager = keyManager;
+		this.transportPropertyManager = transportPropertyManager;
 		this.taskFactory = taskFactory;
 	}
 
@@ -80,6 +94,15 @@ class RemovableDriveManagerImpl
 		return created;
 	}
 
+	@Override
+	public boolean isTransportSupportedByContact(ContactId c)
+			throws DbException {
+		if (!keyManager.canSendOutgoingStreams(c, ID)) return false;
+		TransportProperties p =
+				transportPropertyManager.getRemoteProperties(c, ID);
+		return "true".equals(p.get(PROP_SUPPORTED));
+	}
+
 	@Override
 	public boolean isWriterTaskNeeded(ContactId c) throws DbException {
 		return db.transactionWithResult(true, txn ->

bramble-core/src/main/java/org/briarproject/bramble/plugin/file/RemovableDrivePlugin.java

@@ -1,6 +1,7 @@
 package org.briarproject.bramble.plugin.file;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.api.plugin.PluginCallback;
 import org.briarproject.bramble.api.properties.TransportProperties;
 
 import java.io.FileInputStream;
@@ -18,8 +19,8 @@ import static org.briarproject.bramble.util.StringUtils.isNullOrEmpty;
 @NotNullByDefault
 class RemovableDrivePlugin extends AbstractRemovableDrivePlugin {
 
-	RemovableDrivePlugin(int maxLatency) {
-		super(maxLatency);
+	RemovableDrivePlugin(PluginCallback callback, long maxLatency) {
+		super(callback, maxLatency);
 	}
 
 	@Override

bramble-core/src/main/java/org/briarproject/bramble/plugin/file/RemovableDrivePluginFactory.java

@@ -17,7 +17,7 @@ import static org.briarproject.bramble.api.plugin.file.RemovableDriveConstants.I
 @NotNullByDefault
 public class RemovableDrivePluginFactory implements SimplexPluginFactory {
 
-	static final int MAX_LATENCY = (int) DAYS.toMillis(14);
+	static final long MAX_LATENCY = DAYS.toMillis(28);
 
 	@Inject
 	RemovableDrivePluginFactory() {
@@ -29,13 +29,13 @@ public class RemovableDrivePluginFactory implements SimplexPluginFactory {
 	}
 
 	@Override
-	public int getMaxLatency() {
+	public long getMaxLatency() {
 		return MAX_LATENCY;
 	}
 
 	@Nullable
 	@Override
 	public SimplexPlugin createPlugin(PluginCallback callback) {
-		return new RemovableDrivePlugin(MAX_LATENCY);
+		return new RemovableDrivePlugin(callback, MAX_LATENCY);
 	}
 }

bramble-core/src/main/java/org/briarproject/bramble/plugin/file/RemovableDriveTaskImpl.java

@@ -63,8 +63,6 @@ abstract class RemovableDriveTaskImpl implements RemovableDriveTask {
 		synchronized (lock) {
 			observers.add(o);
 			state = this.state;
-		}
-		if (state.isFinished()) {
 			eventExecutor.execute(() -> o.accept(state));
 		}
 	}

bramble-core/src/main/java/org/briarproject/bramble/plugin/file/RemovableDriveWriterTask.java

@@ -96,7 +96,7 @@ class RemovableDriveWriterTask extends RemovableDriveTaskImpl
 		}
 
 		@Override
-		public int getMaxLatency() {
+		public long getMaxLatency() {
 			return delegate.getMaxLatency();
 		}
 

bramble-core/src/main/java/org/briarproject/bramble/plugin/file/TransportOutputStreamWriter.java

@@ -26,7 +26,7 @@ class TransportOutputStreamWriter implements TransportConnectionWriter {
 	}
 
 	@Override
-	public int getMaxLatency() {
+	public long getMaxLatency() {
 		return plugin.getMaxLatency();
 	}
 

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

@@ -92,7 +92,7 @@ class LanTcpPlugin extends TcpPlugin {
 			Executor wakefulIoExecutor,
 			Backoff backoff,
 			PluginCallback callback,
-			int maxLatency,
+			long maxLatency,
 			int maxIdleTime,
 			int connectionTimeout) {
 		super(ioExecutor, wakefulIoExecutor, backoff, callback, maxLatency,

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

@@ -50,7 +50,7 @@ public class LanTcpPluginFactory implements DuplexPluginFactory {
 	}
 
 	@Override
-	public int getMaxLatency() {
+	public long getMaxLatency() {
 		return MAX_LATENCY;
 	}
 

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

@@ -69,8 +69,8 @@ abstract class TcpPlugin implements DuplexPlugin, EventListener {
 	protected final Executor ioExecutor, wakefulIoExecutor, bindExecutor;
 	protected final Backoff backoff;
 	protected final PluginCallback callback;
-	protected final int maxLatency, maxIdleTime;
-	protected final int connectionTimeout, socketTimeout;
+	protected final long maxLatency;
+	protected final int maxIdleTime, connectionTimeout, socketTimeout;
 	protected final AtomicBoolean used = new AtomicBoolean(false);
 	protected final PluginState state = new PluginState();
 
@@ -111,7 +111,7 @@ abstract class TcpPlugin implements DuplexPlugin, EventListener {
 			Executor wakefulIoExecutor,
 			Backoff backoff,
 			PluginCallback callback,
-			int maxLatency,
+			long maxLatency,
 			int maxIdleTime,
 			int connectionTimeout) {
 		this.ioExecutor = ioExecutor;
@@ -129,7 +129,7 @@ abstract class TcpPlugin implements DuplexPlugin, EventListener {
 	}
 
 	@Override
-	public int getMaxLatency() {
+	public long getMaxLatency() {
 		return maxLatency;
 	}
 

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

@@ -35,7 +35,7 @@ class WanTcpPlugin extends TcpPlugin {
 			Backoff backoff,
 			PortMapper portMapper,
 			PluginCallback callback,
-			int maxLatency,
+			long maxLatency,
 			int maxIdleTime,
 			int connectionTimeout) {
 		super(ioExecutor, wakefulIoExecutor, backoff, callback, maxLatency,

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

@@ -54,7 +54,7 @@ public class WanTcpPluginFactory implements DuplexPluginFactory {
 	}
 
 	@Override
-	public int getMaxLatency() {
+	public long getMaxLatency() {
 		return MAX_LATENCY;
 	}
 

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

@@ -131,7 +131,8 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 	private final String architecture;
 	private final CircumventionProvider circumventionProvider;
 	private final ResourceProvider resourceProvider;
-	private final int maxLatency, maxIdleTime, socketTimeout;
+	private final long maxLatency;
+	private final int maxIdleTime, socketTimeout;
 	private final File torDirectory, geoIpFile, configFile;
 	private final File doneFile, cookieFile;
 	private final AtomicBoolean used = new AtomicBoolean(false);
@@ -159,7 +160,7 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 			TorRendezvousCrypto torRendezvousCrypto,
 			PluginCallback callback,
 			String architecture,
-			int maxLatency,
+			long maxLatency,
 			int maxIdleTime,
 			File torDirectory) {
 		this.ioExecutor = ioExecutor;
@@ -204,7 +205,7 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 	}
 
 	@Override
-	public int getMaxLatency() {
+	public long getMaxLatency() {
 		return maxLatency;
 	}
 

bramble-core/src/main/java/org/briarproject/bramble/sync/DuplexOutgoingSession.java

@@ -77,7 +77,7 @@ class DuplexOutgoingSession implements SyncSession, EventListener {
 	private final Clock clock;
 	private final ContactId contactId;
 	private final TransportId transportId;
-	private final int maxLatency, maxIdleTime;
+	private final long maxLatency, maxIdleTime;
 	private final StreamWriter streamWriter;
 	private final SyncRecordWriter recordWriter;
 	@Nullable
@@ -95,7 +95,7 @@ class DuplexOutgoingSession implements SyncSession, EventListener {
 
 	DuplexOutgoingSession(DatabaseComponent db, Executor dbExecutor,
 			EventBus eventBus, Clock clock, ContactId contactId,
-			TransportId transportId, int maxLatency, int maxIdleTime,
+			TransportId transportId, long maxLatency, int maxIdleTime,
 			StreamWriter streamWriter, SyncRecordWriter recordWriter,
 			@Nullable Priority priority) {
 		this.db = db;

bramble-core/src/main/java/org/briarproject/bramble/sync/SimplexOutgoingSession.java

@@ -65,7 +65,7 @@ class SimplexOutgoingSession implements SyncSession, EventListener {
 	private final EventBus eventBus;
 	private final ContactId contactId;
 	private final TransportId transportId;
-	private final int maxLatency;
+	private final long maxLatency;
 	private final boolean eager;
 	private final StreamWriter streamWriter;
 	private final SyncRecordWriter recordWriter;
@@ -76,7 +76,7 @@ class SimplexOutgoingSession implements SyncSession, EventListener {
 
 	SimplexOutgoingSession(DatabaseComponent db, Executor dbExecutor,
 			EventBus eventBus, ContactId contactId, TransportId transportId,
-			int maxLatency, boolean eager, StreamWriter streamWriter,
+			long maxLatency, boolean eager, StreamWriter streamWriter,
 			SyncRecordWriter recordWriter) {
 		this.db = db;
 		this.dbExecutor = dbExecutor;

bramble-core/src/main/java/org/briarproject/bramble/sync/SyncSessionFactoryImpl.java

@@ -60,7 +60,7 @@ class SyncSessionFactoryImpl implements SyncSessionFactory {
 
 	@Override
 	public SyncSession createSimplexOutgoingSession(ContactId c, TransportId t,
-			int maxLatency, boolean eager, StreamWriter streamWriter) {
+			long maxLatency, boolean eager, StreamWriter streamWriter) {
 		OutputStream out = streamWriter.getOutputStream();
 		SyncRecordWriter recordWriter =
 				recordWriterFactory.createRecordWriter(out);
@@ -70,7 +70,7 @@ class SyncSessionFactoryImpl implements SyncSessionFactory {
 
 	@Override
 	public SyncSession createDuplexOutgoingSession(ContactId c, TransportId t,
-			int maxLatency, int maxIdleTime, StreamWriter streamWriter,
+			long maxLatency, int maxIdleTime, StreamWriter streamWriter,
 			@Nullable Priority priority) {
 		OutputStream out = streamWriter.getOutputStream();
 		SyncRecordWriter recordWriter =

bramble-core/src/main/java/org/briarproject/bramble/transport/KeyManagerImpl.java

@@ -19,9 +19,8 @@ import org.briarproject.bramble.api.lifecycle.Service;
 import org.briarproject.bramble.api.lifecycle.ServiceException;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.PluginConfig;
+import org.briarproject.bramble.api.plugin.PluginFactory;
 import org.briarproject.bramble.api.plugin.TransportId;
-import org.briarproject.bramble.api.plugin.duplex.DuplexPluginFactory;
-import org.briarproject.bramble.api.plugin.simplex.SimplexPluginFactory;
 import org.briarproject.bramble.api.transport.KeyManager;
 import org.briarproject.bramble.api.transport.KeySetId;
 import org.briarproject.bramble.api.transport.StreamContext;
@@ -40,6 +39,7 @@ import javax.annotation.concurrent.ThreadSafe;
 import javax.inject.Inject;
 
 import static java.util.logging.Level.INFO;
+import static org.briarproject.bramble.api.sync.SyncConstants.MAX_TRANSPORT_LATENCY;
 
 @ThreadSafe
 @NotNullByDefault
@@ -67,12 +67,12 @@ class KeyManagerImpl implements KeyManager, Service, EventListener {
 		this.pluginConfig = pluginConfig;
 		this.transportCrypto = transportCrypto;
 		managers = new ConcurrentHashMap<>();
-		for (SimplexPluginFactory f : pluginConfig.getSimplexFactories()) {
+		for (PluginFactory<?> f : pluginConfig.getSimplexFactories()) {
 			TransportKeyManager m = transportKeyManagerFactory.
 					createTransportKeyManager(f.getId(), f.getMaxLatency());
 			managers.put(f.getId(), m);
 		}
-		for (DuplexPluginFactory f : pluginConfig.getDuplexFactories()) {
+		for (PluginFactory<?> f : pluginConfig.getDuplexFactories()) {
 			TransportKeyManager m = transportKeyManagerFactory.
 					createTransportKeyManager(f.getId(), f.getMaxLatency());
 			managers.put(f.getId(), m);
@@ -84,15 +84,11 @@ class KeyManagerImpl implements KeyManager, Service, EventListener {
 		if (used.getAndSet(true)) throw new IllegalStateException();
 		try {
 			db.transaction(false, txn -> {
-				for (SimplexPluginFactory f :
-						pluginConfig.getSimplexFactories()) {
-					db.addTransport(txn, f.getId(), f.getMaxLatency());
-					managers.get(f.getId()).start(txn);
+				for (PluginFactory<?> f : pluginConfig.getSimplexFactories()) {
+					addTransport(txn, f);
 				}
-				for (DuplexPluginFactory f :
-						pluginConfig.getDuplexFactories()) {
-					db.addTransport(txn, f.getId(), f.getMaxLatency());
-					managers.get(f.getId()).start(txn);
+				for (PluginFactory<?> f : pluginConfig.getDuplexFactories()) {
+					addTransport(txn, f);
 				}
 			});
 		} catch (DbException e) {
@@ -100,6 +96,16 @@ class KeyManagerImpl implements KeyManager, Service, EventListener {
 		}
 	}
 
+	private void addTransport(Transaction txn, PluginFactory<?> f)
+			throws DbException {
+		long maxLatency = f.getMaxLatency();
+		if (maxLatency > MAX_TRANSPORT_LATENCY) {
+			throw new IllegalStateException();
+		}
+		db.addTransport(txn, f.getId(), maxLatency);
+		managers.get(f.getId()).start(txn);
+	}
+
 	@Override
 	public void stopService() {
 	}

bramble-core/src/main/java/org/briarproject/bramble/transport/agreement/TransportKeyAgreementManagerImpl.java

@@ -22,9 +22,8 @@ import org.briarproject.bramble.api.identity.IdentityManager;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager.OpenDatabaseHook;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.PluginConfig;
+import org.briarproject.bramble.api.plugin.PluginFactory;
 import org.briarproject.bramble.api.plugin.TransportId;
-import org.briarproject.bramble.api.plugin.duplex.DuplexPluginFactory;
-import org.briarproject.bramble.api.plugin.simplex.SimplexPluginFactory;
 import org.briarproject.bramble.api.sync.Group;
 import org.briarproject.bramble.api.sync.Group.Visibility;
 import org.briarproject.bramble.api.sync.GroupId;
@@ -110,11 +109,11 @@ class TransportKeyAgreementManagerImpl extends BdfIncomingMessageHook
 		this.sessionParser = sessionParser;
 		this.crypto = crypto;
 		transports = new ArrayList<>();
-		for (DuplexPluginFactory duplex : config.getDuplexFactories()) {
-			transports.add(duplex.getId());
+		for (PluginFactory<?> f : config.getDuplexFactories()) {
+			transports.add(f.getId());
 		}
-		for (SimplexPluginFactory simplex : config.getSimplexFactories()) {
-			transports.add(simplex.getId());
+		for (PluginFactory<?> f : config.getSimplexFactories()) {
+			transports.add(f.getId());
 		}
 		localGroup = contactGroupFactory.createLocalGroup(CLIENT_ID,
 				MAJOR_VERSION);

bramble-core/src/main/java/org/briarproject/bramble/transport/agreement/TransportKeyAgreementValidator.java

@@ -19,6 +19,7 @@ import javax.annotation.concurrent.Immutable;
 import static java.util.Collections.singletonList;
 import static org.briarproject.bramble.api.crypto.CryptoConstants.MAX_AGREEMENT_PUBLIC_KEY_BYTES;
 import static org.briarproject.bramble.api.plugin.TransportId.MAX_TRANSPORT_ID_LENGTH;
+import static org.briarproject.bramble.api.system.Clock.MIN_REASONABLE_TIME_MS;
 import static org.briarproject.bramble.transport.agreement.MessageType.ACTIVATE;
 import static org.briarproject.bramble.transport.agreement.MessageType.KEY;
 import static org.briarproject.bramble.transport.agreement.TransportKeyAgreementConstants.MSG_KEY_PUBLIC_KEY;
@@ -42,13 +43,14 @@ class TransportKeyAgreementValidator extends BdfMessageValidator {
 	protected BdfMessageContext validateMessage(Message m, Group g,
 			BdfList body) throws FormatException {
 		MessageType type = MessageType.fromValue(body.getLong(0).intValue());
-		if (type == KEY) return validateKeyMessage(body);
+		if (type == KEY) return validateKeyMessage(m.getTimestamp(), body);
 		else if (type == ACTIVATE) return validateActivateMessage(body);
 		else throw new AssertionError();
 	}
 
-	private BdfMessageContext validateKeyMessage(BdfList body)
+	private BdfMessageContext validateKeyMessage(long timestamp, BdfList body)
 			throws FormatException {
+		if (timestamp < MIN_REASONABLE_TIME_MS) throw new FormatException();
 		// Message type, transport ID, public key
 		checkSize(body, 3);
 		String transportId = body.getString(1);

bramble-core/src/main/resources/bridges

@@ -1,6 +1,3 @@
-Bridge obfs4 192.95.36.142:443 CDF2E852BF539B82BD10E27E9115A31734E378C2 cert=qUVQ0srL1JI/vO6V6m/24anYXiJD3QP2HgzUKQtQ7GRqqUvs7P+tG43RtAqdhLOALP7DJQ iat-mode=1
-Bridge obfs4 38.229.1.78:80 C8CBDB2464FC9804A69531437BCF2BE31FDD2EE4 cert=Hmyfd2ev46gGY7NoVxA9ngrPF2zCZtzskRTzoWXbxNkzeVnGFPWmrTtILRyqCTjHR+s9dg iat-mode=1
-Bridge obfs4 38.229.33.83:80 0BAC39417268B96B9F514E7F63FA6FBA1A788955 cert=VwEFpk9F/UN9JED7XpG1XOjm/O8ZCXK80oPecgWnNDZDv5pdkhq1OpbAH0wNqOT6H6BmRQ iat-mode=1
 Bridge obfs4 37.218.245.14:38224 D9A82D2F9C2F65A18407B1D2B764F130847F8B5D cert=bjRaMrr1BRiAW8IE9U5z27fQaYgOhX1UCmOpg2pFpoMvo6ZgQMzLsaTzzQNTlm7hNcb+Sg iat-mode=0
 Bridge obfs4 85.31.186.26:443 91A6354697E6B02A386312F68D82CF86824D3606 cert=PBwr+S8JTVZo6MPdHnkTwXJPILWADLqfMGoVvhZClMq/Urndyd42BwX9YFJHZnBB3H0XCw iat-mode=0
 Bridge obfs4 193.11.166.194:27015 2D82C2E354D531A68469ADF7F878FA6060C6BACA cert=4TLQPJrTSaDffMK7Nbao6LC7G9OW/NHkUwIdjLSS3KYf0Nv4/nQiiI8dY2TcsQx01NniOg iat-mode=0

bramble-core/src/test/java/org/briarproject/bramble/db/DatabaseComponentImplTest.java

@@ -120,7 +120,7 @@ public class DatabaseComponentImplTest extends BrambleMockTestCase {
 	private final MessageId messageId, messageId1;
 	private final Metadata metadata;
 	private final TransportId transportId;
-	private final int maxLatency;
+	private final long maxLatency;
 	private final ContactId contactId;
 	private final Contact contact;
 	private final KeySetId keySetId;

bramble-core/src/test/java/org/briarproject/bramble/db/ExponentialBackoffTest.java

@@ -3,6 +3,7 @@ package org.briarproject.bramble.db;
 import org.briarproject.bramble.test.BrambleTestCase;
 import org.junit.Test;
 
+import static org.briarproject.bramble.api.sync.SyncConstants.MAX_TRANSPORT_LATENCY;
 import static org.junit.Assert.assertEquals;
 
 public class ExponentialBackoffTest extends BrambleTestCase {
@@ -36,28 +37,28 @@ public class ExponentialBackoffTest extends BrambleTestCase {
 
 	@Test
 	public void testTransmissionCountOverflow() {
-		int maxLatency = Integer.MAX_VALUE; // RTT will not overflow
+		long maxLatency = MAX_TRANSPORT_LATENCY; // RTT will not overflow
 		long expiry = ExponentialBackoff.calculateExpiry(0, maxLatency, 0);
-		assertEquals(Integer.MAX_VALUE * 2L, expiry); // No overflow
-		expiry = ExponentialBackoff.calculateExpiry(0, maxLatency, 31);
-		assertEquals(Integer.MAX_VALUE * (2L << 31), expiry); // No overflow
-		expiry = ExponentialBackoff.calculateExpiry(0, maxLatency, 32);
+		assertEquals(MAX_TRANSPORT_LATENCY * 2L, expiry); // No overflow
+		expiry = ExponentialBackoff.calculateExpiry(0, maxLatency, 27);
+		assertEquals(MAX_TRANSPORT_LATENCY * (2L << 27), expiry); // No overflow
+		expiry = ExponentialBackoff.calculateExpiry(0, maxLatency, 28);
 		assertEquals(Long.MAX_VALUE, expiry); // Overflow caught
-		expiry = ExponentialBackoff.calculateExpiry(0, maxLatency, 33);
+		expiry = ExponentialBackoff.calculateExpiry(0, maxLatency, 29);
 		assertEquals(Long.MAX_VALUE, expiry); // Overflow caught
 	}
 
 	@Test
 	public void testCurrentTimeOverflow() {
-		int maxLatency = Integer.MAX_VALUE; // RTT will not overflow
-		long now = Long.MAX_VALUE - (Integer.MAX_VALUE * (2L << 31));
+		long maxLatency = MAX_TRANSPORT_LATENCY; // RTT will not overflow
+		long now = Long.MAX_VALUE - (MAX_TRANSPORT_LATENCY * (2L << 27));
 		long expiry = ExponentialBackoff.calculateExpiry(now, maxLatency, 0);
-		assertEquals(now + Integer.MAX_VALUE * 2L, expiry); // No overflow
-		expiry = ExponentialBackoff.calculateExpiry(now - 1, maxLatency, 31);
+		assertEquals(now + MAX_TRANSPORT_LATENCY * 2L, expiry); // No overflow
+		expiry = ExponentialBackoff.calculateExpiry(now - 1, maxLatency, 27);
 		assertEquals(Long.MAX_VALUE - 1, expiry); // No overflow
-		expiry = ExponentialBackoff.calculateExpiry(now, maxLatency, 31);
+		expiry = ExponentialBackoff.calculateExpiry(now, maxLatency, 27);
 		assertEquals(Long.MAX_VALUE, expiry); // No overflow
-		expiry = ExponentialBackoff.calculateExpiry(now + 1, maxLatency, 32);
+		expiry = ExponentialBackoff.calculateExpiry(now + 1, maxLatency, 27);
 		assertEquals(Long.MAX_VALUE, expiry); // Overflow caught
 	}
 }

bramble-core/src/test/java/org/briarproject/bramble/lifecycle/LifecycleManagerImplTest.java

@@ -6,6 +6,7 @@ import org.briarproject.bramble.api.db.Transaction;
 import org.briarproject.bramble.api.event.EventBus;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager.OpenDatabaseHook;
 import org.briarproject.bramble.api.lifecycle.event.LifecycleEvent;
+import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.bramble.test.BrambleMockTestCase;
 import org.briarproject.bramble.test.DbExpectations;
 import org.junit.Before;
@@ -14,7 +15,10 @@ import org.junit.Test;
 import java.util.concurrent.atomic.AtomicBoolean;
 
 import static junit.framework.TestCase.assertTrue;
+import static org.briarproject.bramble.api.lifecycle.LifecycleManager.StartResult.CLOCK_ERROR;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.StartResult.SUCCESS;
+import static org.briarproject.bramble.api.system.Clock.MAX_REASONABLE_TIME_MS;
+import static org.briarproject.bramble.api.system.Clock.MIN_REASONABLE_TIME_MS;
 import static org.briarproject.bramble.test.TestUtils.getSecretKey;
 import static org.junit.Assert.assertEquals;
 
@@ -22,6 +26,7 @@ public class LifecycleManagerImplTest extends BrambleMockTestCase {
 
 	private final DatabaseComponent db = context.mock(DatabaseComponent.class);
 	private final EventBus eventBus = context.mock(EventBus.class);
+	private final Clock clock = context.mock(Clock.class);
 
 	private final SecretKey dbKey = getSecretKey();
 
@@ -29,16 +34,19 @@ public class LifecycleManagerImplTest extends BrambleMockTestCase {
 
 	@Before
 	public void setUp() {
-		lifecycleManager = new LifecycleManagerImpl(db, eventBus);
+		lifecycleManager = new LifecycleManagerImpl(db, eventBus, clock);
 	}
 
 	@Test
 	public void testOpenDatabaseHooksAreCalledAtStartup() throws Exception {
+		long now = System.currentTimeMillis();
 		Transaction txn = new Transaction(null, false);
 		AtomicBoolean called = new AtomicBoolean(false);
 		OpenDatabaseHook hook = transaction -> called.set(true);
 
 		context.checking(new DbExpectations() {{
+			oneOf(clock).currentTimeMillis();
+			will(returnValue(now));
 			oneOf(db).open(dbKey, lifecycleManager);
 			will(returnValue(false));
 			oneOf(db).transaction(with(false), withDbRunnable(txn));
@@ -51,4 +59,26 @@ public class LifecycleManagerImplTest extends BrambleMockTestCase {
 		assertEquals(SUCCESS, lifecycleManager.startServices(dbKey));
 		assertTrue(called.get());
 	}
+
+	@Test
+	public void testStartupFailsIfClockIsUnreasonablyBehind() {
+
+		context.checking(new DbExpectations() {{
+			oneOf(clock).currentTimeMillis();
+			will(returnValue(MIN_REASONABLE_TIME_MS - 1));
+		}});
+
+		assertEquals(CLOCK_ERROR, lifecycleManager.startServices(dbKey));
+	}
+
+	@Test
+	public void testStartupFailsIfClockIsUnreasonablyAhead() {
+
+		context.checking(new DbExpectations() {{
+			oneOf(clock).currentTimeMillis();
+			will(returnValue(MAX_REASONABLE_TIME_MS + 1));
+		}});
+
+		assertEquals(CLOCK_ERROR, lifecycleManager.startServices(dbKey));
+	}
 }

bramble-core/src/test/java/org/briarproject/bramble/plugin/file/RemovableDriveIntegrationTestComponent.java

@@ -12,6 +12,7 @@ import org.briarproject.bramble.event.DefaultEventExecutorModule;
 import org.briarproject.bramble.system.DefaultWakefulIoExecutorModule;
 import org.briarproject.bramble.system.TimeTravelModule;
 import org.briarproject.bramble.test.TestDatabaseConfigModule;
+import org.briarproject.bramble.test.TestFeatureFlagModule;
 import org.briarproject.bramble.test.TestSecureRandomModule;
 
 import javax.inject.Singleton;
@@ -25,6 +26,7 @@ import dagger.Component;
 		DefaultEventExecutorModule.class,
 		DefaultWakefulIoExecutorModule.class,
 		TestDatabaseConfigModule.class,
+		TestFeatureFlagModule.class,
 		RemovableDriveIntegrationTestModule.class,
 		RemovableDriveModule.class,
 		TestSecureRandomModule.class,

bramble-core/src/test/java/org/briarproject/bramble/plugin/file/RemovableDriveIntegrationTestModule.java

@@ -1,6 +1,5 @@
 package org.briarproject.bramble.plugin.file;
 
-import org.briarproject.bramble.api.FeatureFlags;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.PluginConfig;
 import org.briarproject.bramble.api.plugin.TransportId;
@@ -52,30 +51,4 @@ class RemovableDriveIntegrationTestModule {
 		};
 		return pluginConfig;
 	}
-
-	@Provides
-	FeatureFlags provideFeatureFlags() {
-		return new FeatureFlags() {
-
-			@Override
-			public boolean shouldEnableImageAttachments() {
-				return true;
-			}
-
-			@Override
-			public boolean shouldEnableProfilePictures() {
-				return true;
-			}
-
-			@Override
-			public boolean shouldEnableDisappearingMessages() {
-				return true;
-			}
-
-			@Override
-			public boolean shouldEnableConnectViaBluetooth() {
-				return true;
-			}
-		};
-	}
 }

bramble-core/src/test/java/org/briarproject/bramble/test/BrambleCoreIntegrationTestModule.java

@@ -1,48 +1,22 @@
 package org.briarproject.bramble.test;
 
-import org.briarproject.bramble.api.FeatureFlags;
 import org.briarproject.bramble.battery.DefaultBatteryManagerModule;
 import org.briarproject.bramble.event.DefaultEventExecutorModule;
 import org.briarproject.bramble.system.DefaultWakefulIoExecutorModule;
 import org.briarproject.bramble.system.TimeTravelModule;
 
 import dagger.Module;
-import dagger.Provides;
 
 @Module(includes = {
 		DefaultBatteryManagerModule.class,
 		DefaultEventExecutorModule.class,
 		DefaultWakefulIoExecutorModule.class,
 		TestDatabaseConfigModule.class,
+		TestFeatureFlagModule.class,
 		TestPluginConfigModule.class,
 		TestSecureRandomModule.class,
 		TimeTravelModule.class
 })
 public class BrambleCoreIntegrationTestModule {
 
-	@Provides
-	FeatureFlags provideFeatureFlags() {
-		return new FeatureFlags() {
-
-			@Override
-			public boolean shouldEnableImageAttachments() {
-				return true;
-			}
-
-			@Override
-			public boolean shouldEnableProfilePictures() {
-				return true;
-			}
-
-			@Override
-			public boolean shouldEnableDisappearingMessages() {
-				return true;
-			}
-
-			@Override
-			public boolean shouldEnableConnectViaBluetooth() {
-				return true;
-			}
-		};
-	}
 }

bramble-core/src/test/java/org/briarproject/bramble/test/BrambleIntegrationTest.java

@@ -0,0 +1,336 @@
+package org.briarproject.bramble.test;
+
+import net.jodah.concurrentunit.Waiter;
+
+import org.briarproject.bramble.api.FormatException;
+import org.briarproject.bramble.api.client.ClientHelper;
+import org.briarproject.bramble.api.contact.ContactId;
+import org.briarproject.bramble.api.data.BdfList;
+import org.briarproject.bramble.api.data.BdfStringUtils;
+import org.briarproject.bramble.api.db.DbException;
+import org.briarproject.bramble.api.event.Event;
+import org.briarproject.bramble.api.event.EventBus;
+import org.briarproject.bramble.api.event.EventListener;
+import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
+import org.briarproject.bramble.api.plugin.TransportId;
+import org.briarproject.bramble.api.sync.MessageId;
+import org.briarproject.bramble.api.sync.event.MessageStateChangedEvent;
+import org.briarproject.bramble.api.sync.event.MessagesAckedEvent;
+import org.briarproject.bramble.api.sync.event.MessagesSentEvent;
+import org.junit.After;
+import org.junit.Before;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.File;
+import java.util.HashSet;
+import java.util.Set;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.Executor;
+import java.util.concurrent.Semaphore;
+import java.util.concurrent.TimeoutException;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.logging.Logger;
+
+import javax.annotation.Nonnull;
+
+import static java.util.concurrent.Executors.newSingleThreadExecutor;
+import static java.util.concurrent.TimeUnit.MILLISECONDS;
+import static java.util.concurrent.TimeUnit.MINUTES;
+import static java.util.logging.Level.WARNING;
+import static java.util.logging.Logger.getLogger;
+import static org.briarproject.bramble.api.sync.validation.MessageState.DELIVERED;
+import static org.briarproject.bramble.api.sync.validation.MessageState.INVALID;
+import static org.briarproject.bramble.api.sync.validation.MessageState.PENDING;
+import static org.briarproject.bramble.test.TestPluginConfigModule.SIMPLEX_TRANSPORT_ID;
+import static org.briarproject.bramble.util.LogUtils.logException;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+
+@MethodsNotNullByDefault
+@ParametersNotNullByDefault
+public abstract class BrambleIntegrationTest<C extends BrambleIntegrationTestComponent>
+		extends BrambleTestCase {
+
+	private static final Logger LOG =
+			getLogger(BrambleIntegrationTest.class.getName());
+
+	private static final boolean DEBUG = false;
+
+	protected final static int TIMEOUT = 15000;
+
+	// objects accessed from background threads need to be volatile
+	private volatile Waiter validationWaiter;
+	private volatile Waiter deliveryWaiter;
+	private volatile Waiter ackWaiter;
+	private volatile boolean expectAck = false;
+
+	private final Semaphore messageSemaphore = new Semaphore(0);
+	private final AtomicInteger deliveryCounter = new AtomicInteger(0);
+	private final AtomicInteger validationCounter = new AtomicInteger(0);
+	private final AtomicInteger ackCounter = new AtomicInteger(0);
+
+	protected final File testDir = TestUtils.getTestDirectory();
+
+	@Before
+	public void setUp() throws Exception {
+		assertTrue(testDir.mkdirs());
+
+		// initialize waiters fresh for each test
+		validationWaiter = new Waiter();
+		deliveryWaiter = new Waiter();
+		ackWaiter = new Waiter();
+		deliveryCounter.set(0);
+		validationCounter.set(0);
+		ackCounter.set(0);
+	}
+
+	@After
+	public void tearDown() throws Exception {
+		TestUtils.deleteTestDirectory(testDir);
+	}
+
+	protected void addEventListener(C c) {
+		c.getEventBus().addListener(new Listener(c));
+	}
+
+	private class Listener implements EventListener {
+
+		private final ClientHelper clientHelper;
+		private final Executor executor;
+
+		private Listener(C c) {
+			clientHelper = c.getClientHelper();
+			executor = newSingleThreadExecutor();
+		}
+
+		@Override
+		public void eventOccurred(Event e) {
+			if (e instanceof MessageStateChangedEvent) {
+				MessageStateChangedEvent event = (MessageStateChangedEvent) e;
+				if (!event.isLocal()) {
+					if (event.getState() == DELIVERED) {
+						LOG.info("Delivered new message "
+								+ event.getMessageId());
+						deliveryCounter.addAndGet(1);
+						loadAndLogMessage(event.getMessageId());
+						deliveryWaiter.resume();
+					} else if (event.getState() == INVALID ||
+							event.getState() == PENDING) {
+						LOG.info("Validated new " + event.getState().name() +
+								" message " + event.getMessageId());
+						validationCounter.addAndGet(1);
+						loadAndLogMessage(event.getMessageId());
+						validationWaiter.resume();
+					}
+				}
+			} else if (e instanceof MessagesAckedEvent && expectAck) {
+				MessagesAckedEvent event = (MessagesAckedEvent) e;
+				ackCounter.addAndGet(event.getMessageIds().size());
+				for (MessageId m : event.getMessageIds()) {
+					loadAndLogMessage(m);
+					ackWaiter.resume();
+				}
+			}
+		}
+
+		private void loadAndLogMessage(MessageId id) {
+			executor.execute(() -> {
+				if (DEBUG) {
+					try {
+						BdfList body = clientHelper.getMessageAsList(id);
+						LOG.info("Contents of " + id + ":\n"
+								+ BdfStringUtils.toString(body));
+					} catch (DbException | FormatException e) {
+						logException(LOG, WARNING, e);
+					}
+				}
+				messageSemaphore.release();
+			});
+		}
+	}
+
+
+	protected void syncMessage(BrambleIntegrationTestComponent fromComponent,
+			BrambleIntegrationTestComponent toComponent, ContactId toId,
+			TransportId transportId, int num, boolean valid) throws Exception {
+		syncMessage(fromComponent, toComponent, toId, transportId, num, 0,
+				valid ? 0 : num, valid ? num : 0);
+	}
+
+	protected void syncMessage(BrambleIntegrationTestComponent fromComponent,
+			BrambleIntegrationTestComponent toComponent, ContactId toId,
+			int num, boolean valid) throws Exception {
+		syncMessage(fromComponent, toComponent, toId, num, 0, valid ? 0 : num,
+				valid ? num : 0);
+	}
+
+	protected void syncMessage(BrambleIntegrationTestComponent fromComponent,
+			BrambleIntegrationTestComponent toComponent, ContactId toId,
+			int numNew, int numDupes, int numPendingOrInvalid, int numDelivered)
+			throws Exception {
+		syncMessage(fromComponent, toComponent, toId, SIMPLEX_TRANSPORT_ID,
+				numNew, numDupes, numPendingOrInvalid, numDelivered);
+	}
+
+	protected void syncMessage(BrambleIntegrationTestComponent fromComponent,
+			BrambleIntegrationTestComponent toComponent, ContactId toId,
+			TransportId transportId, int numNew, int numDupes,
+			int numPendingOrInvalid, int numDelivered) throws Exception {
+		// Debug output
+		String from =
+				fromComponent.getIdentityManager().getLocalAuthor().getName();
+		String to = toComponent.getIdentityManager().getLocalAuthor().getName();
+		LOG.info("TEST: Sending " + (numNew + numDupes) + " message(s) from "
+				+ from + " to " + to);
+
+		// Listen for messages being sent
+		waitForEvents(fromComponent);
+		SendListener sendListener = new SendListener();
+		fromComponent.getEventBus().addListener(sendListener);
+
+		// Write the messages to a transport stream
+		ByteArrayOutputStream out = new ByteArrayOutputStream();
+		TestTransportConnectionWriter writer =
+				new TestTransportConnectionWriter(out, false);
+		fromComponent.getConnectionManager().manageOutgoingConnection(toId,
+				transportId, writer);
+		writer.getDisposedLatch().await(TIMEOUT, MILLISECONDS);
+
+		// Check that the expected number of messages were sent
+		waitForEvents(fromComponent);
+		fromComponent.getEventBus().removeListener(sendListener);
+		assertEquals("Messages sent", numNew + numDupes,
+				sendListener.sent.size());
+
+		// Read the messages from the transport stream
+		ByteArrayInputStream in = new ByteArrayInputStream(out.toByteArray());
+		TestTransportConnectionReader reader =
+				new TestTransportConnectionReader(in);
+		toComponent.getConnectionManager().manageIncomingConnection(
+				transportId, reader);
+
+		if (numPendingOrInvalid > 0) {
+			validationWaiter.await(TIMEOUT, numPendingOrInvalid);
+		}
+		assertEquals("Messages validated", numPendingOrInvalid,
+				validationCounter.getAndSet(0));
+
+		if (numDelivered > 0) {
+			deliveryWaiter.await(TIMEOUT, numDelivered);
+		}
+		assertEquals("Messages delivered", numDelivered,
+				deliveryCounter.getAndSet(0));
+
+		try {
+			messageSemaphore.tryAcquire(numNew, TIMEOUT, MILLISECONDS);
+		} catch (InterruptedException e) {
+			LOG.info("Interrupted while waiting for messages");
+			Thread.currentThread().interrupt();
+			fail();
+		}
+	}
+
+	protected void awaitPendingMessageDelivery(int num)
+			throws TimeoutException {
+		deliveryWaiter.await(TIMEOUT, num);
+		assertEquals("Messages delivered", num, deliveryCounter.getAndSet(0));
+
+		try {
+			messageSemaphore.tryAcquire(num, TIMEOUT, MILLISECONDS);
+		} catch (InterruptedException e) {
+			LOG.info("Interrupted while waiting for messages");
+			Thread.currentThread().interrupt();
+			fail();
+		}
+	}
+
+	protected void sendAcks(BrambleIntegrationTestComponent fromComponent,
+			BrambleIntegrationTestComponent toComponent, ContactId toId,
+			int num) throws Exception {
+		// Debug output
+		String from =
+				fromComponent.getIdentityManager().getLocalAuthor().getName();
+		String to = toComponent.getIdentityManager().getLocalAuthor().getName();
+		LOG.info("TEST: Sending " + num + " ACKs from " + from + " to " + to);
+
+		expectAck = true;
+
+		// Listen for messages being sent (none should be sent)
+		waitForEvents(fromComponent);
+		SendListener sendListener = new SendListener();
+		fromComponent.getEventBus().addListener(sendListener);
+
+		// start outgoing connection
+		ByteArrayOutputStream out = new ByteArrayOutputStream();
+		TestTransportConnectionWriter writer =
+				new TestTransportConnectionWriter(out, false);
+		fromComponent.getConnectionManager().manageOutgoingConnection(toId,
+				SIMPLEX_TRANSPORT_ID, writer);
+		writer.getDisposedLatch().await(TIMEOUT, MILLISECONDS);
+
+		// Check that no messages were sent
+		waitForEvents(fromComponent);
+		fromComponent.getEventBus().removeListener(sendListener);
+		assertEquals("Messages sent", 0, sendListener.sent.size());
+
+		// handle incoming connection
+		ByteArrayInputStream in = new ByteArrayInputStream(out.toByteArray());
+		TestTransportConnectionReader reader =
+				new TestTransportConnectionReader(in);
+		toComponent.getConnectionManager().manageIncomingConnection(
+				SIMPLEX_TRANSPORT_ID, reader);
+
+		ackWaiter.await(TIMEOUT, num);
+		assertEquals("ACKs delivered", num, ackCounter.getAndSet(0));
+		assertEquals("No messages delivered", 0, deliveryCounter.get());
+		try {
+			messageSemaphore.tryAcquire(num, TIMEOUT, MILLISECONDS);
+		} catch (InterruptedException e) {
+			LOG.info("Interrupted while waiting for messages");
+			Thread.currentThread().interrupt();
+			fail();
+		} finally {
+			expectAck = false;
+		}
+	}
+
+	/**
+	 * Broadcasts a marker event and waits for it to be delivered, which
+	 * indicates that all previously broadcast events have been delivered.
+	 */
+	public static void waitForEvents(BrambleIntegrationTestComponent component)
+			throws Exception {
+		CountDownLatch latch = new CountDownLatch(1);
+		MarkerEvent marker = new MarkerEvent();
+		EventBus eventBus = component.getEventBus();
+		eventBus.addListener(new EventListener() {
+			@Override
+			public void eventOccurred(@Nonnull Event e) {
+				if (e == marker) {
+					latch.countDown();
+					eventBus.removeListener(this);
+				}
+			}
+		});
+		eventBus.broadcast(marker);
+		if (!latch.await(1, MINUTES)) fail();
+	}
+
+	private static class MarkerEvent extends Event {
+	}
+
+	private static class SendListener implements EventListener {
+
+		private final Set<MessageId> sent = new HashSet<>();
+
+		@Override
+		public void eventOccurred(Event e) {
+			if (e instanceof MessagesSentEvent) {
+				sent.addAll(((MessagesSentEvent) e).getMessageIds());
+			}
+		}
+	}
+}

bramble-core/src/test/java/org/briarproject/bramble/test/BrambleIntegrationTestComponent.java

@@ -0,0 +1,30 @@
+package org.briarproject.bramble.test;
+
+import org.briarproject.bramble.BrambleCoreIntegrationTestEagerSingletons;
+import org.briarproject.bramble.BrambleCoreModule;
+import org.briarproject.bramble.api.client.ClientHelper;
+import org.briarproject.bramble.api.connection.ConnectionManager;
+import org.briarproject.bramble.api.event.EventBus;
+import org.briarproject.bramble.api.identity.IdentityManager;
+
+import javax.inject.Singleton;
+
+import dagger.Component;
+
+@Singleton
+@Component(modules = {
+		BrambleCoreIntegrationTestModule.class,
+		BrambleCoreModule.class
+})
+public interface BrambleIntegrationTestComponent
+		extends BrambleCoreIntegrationTestEagerSingletons {
+
+	IdentityManager getIdentityManager();
+
+	EventBus getEventBus();
+
+	ConnectionManager getConnectionManager();
+
+	ClientHelper getClientHelper();
+
+}

bramble-core/src/test/java/org/briarproject/bramble/test/TestFeatureFlagModule.java

@@ -0,0 +1,44 @@
+package org.briarproject.bramble.test;
+
+import org.briarproject.bramble.api.FeatureFlags;
+
+import dagger.Module;
+import dagger.Provides;
+
+@Module
+public class TestFeatureFlagModule {
+	@Provides
+	FeatureFlags provideFeatureFlags() {
+		return new FeatureFlags() {
+			@Override
+			public boolean shouldEnableImageAttachments() {
+				return true;
+			}
+
+			@Override
+			public boolean shouldEnableProfilePictures() {
+				return true;
+			}
+
+			@Override
+			public boolean shouldEnableDisappearingMessages() {
+				return true;
+			}
+
+			@Override
+			public boolean shouldEnableConnectViaBluetooth() {
+				return true;
+			}
+
+			@Override
+			public boolean shouldEnableShareAppViaOfflineHotspot() {
+				return true;
+			}
+
+			@Override
+			public boolean shouldEnableTransferData() {
+				return true;
+			}
+		};
+	}
+}

bramble-core/src/test/java/org/briarproject/bramble/test/TestPluginConfigModule.java

@@ -27,18 +27,30 @@ public class TestPluginConfigModule {
 
 	public static final TransportId SIMPLEX_TRANSPORT_ID = getTransportId();
 	public static final TransportId DUPLEX_TRANSPORT_ID = getTransportId();
-	public static final int MAX_LATENCY = 30_000; // 30 seconds
+	private static final int MAX_LATENCY = 30_000; // 30 seconds
+
+	private final TransportId simplexTransportId, duplexTransportId;
+
+	public TestPluginConfigModule() {
+		this(SIMPLEX_TRANSPORT_ID, DUPLEX_TRANSPORT_ID);
+	}
+
+	public TestPluginConfigModule(TransportId simplexTransportId,
+			TransportId duplexTransportId) {
+		this.simplexTransportId = simplexTransportId;
+		this.duplexTransportId = duplexTransportId;
+	}
 
 	@NotNullByDefault
 	private final SimplexPluginFactory simplex = new SimplexPluginFactory() {
 
 		@Override
 		public TransportId getId() {
-			return SIMPLEX_TRANSPORT_ID;
+			return simplexTransportId;
 		}
 
 		@Override
-		public int getMaxLatency() {
+		public long getMaxLatency() {
 			return MAX_LATENCY;
 		}
 
@@ -54,11 +66,11 @@ public class TestPluginConfigModule {
 
 		@Override
 		public TransportId getId() {
-			return DUPLEX_TRANSPORT_ID;
+			return duplexTransportId;
 		}
 
 		@Override
-		public int getMaxLatency() {
+		public long getMaxLatency() {
 			return MAX_LATENCY;
 		}
 
@@ -70,7 +82,7 @@ public class TestPluginConfigModule {
 	};
 
 	@Provides
-	PluginConfig providePluginConfig() {
+	public PluginConfig providePluginConfig() {
 		@NotNullByDefault
 		PluginConfig pluginConfig = new PluginConfig() {
 

bramble-core/src/test/java/org/briarproject/bramble/test/TestTransportConnectionWriter.java

@@ -29,7 +29,7 @@ public class TestTransportConnectionWriter
 	}
 
 	@Override
-	public int getMaxLatency() {
+	public long getMaxLatency() {
 		return 30_000;
 	}
 

bramble-core/src/test/java/org/briarproject/bramble/transport/KeyManagerImplTest.java

@@ -81,7 +81,7 @@ public class KeyManagerImplTest extends BrambleMockTestCase {
 				context.mock(SimplexPluginFactory.class);
 		Collection<SimplexPluginFactory> factories =
 				singletonList(pluginFactory);
-		int maxLatency = 1337;
+		long maxLatency = 1337;
 
 		context.checking(new Expectations() {{
 			allowing(pluginConfig).getSimplexFactories();

bramble-core/src/test/java/org/briarproject/bramble/transport/agreement/TransportKeyAgreementIntegrationTest.java

@@ -0,0 +1,418 @@
+package org.briarproject.bramble.transport.agreement;
+
+import org.briarproject.bramble.BrambleCoreIntegrationTestEagerSingletons;
+import org.briarproject.bramble.api.Pair;
+import org.briarproject.bramble.api.contact.Contact;
+import org.briarproject.bramble.api.contact.ContactId;
+import org.briarproject.bramble.api.contact.ContactManager;
+import org.briarproject.bramble.api.crypto.SecretKey;
+import org.briarproject.bramble.api.data.BdfDictionary;
+import org.briarproject.bramble.api.db.DatabaseComponent;
+import org.briarproject.bramble.api.identity.Author;
+import org.briarproject.bramble.api.identity.AuthorId;
+import org.briarproject.bramble.api.identity.Identity;
+import org.briarproject.bramble.api.identity.IdentityManager;
+import org.briarproject.bramble.api.lifecycle.LifecycleManager;
+import org.briarproject.bramble.api.plugin.TransportId;
+import org.briarproject.bramble.api.properties.TransportProperties;
+import org.briarproject.bramble.api.sync.Group;
+import org.briarproject.bramble.api.sync.MessageId;
+import org.briarproject.bramble.test.BrambleIntegrationTest;
+import org.briarproject.bramble.test.TestDatabaseConfigModule;
+import org.briarproject.bramble.test.TestPluginConfigModule;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.io.File;
+import java.util.Map;
+
+import static org.briarproject.bramble.api.transport.agreement.TransportKeyAgreementManager.CLIENT_ID;
+import static org.briarproject.bramble.api.transport.agreement.TransportKeyAgreementManager.MAJOR_VERSION;
+import static org.briarproject.bramble.test.TestPluginConfigModule.DUPLEX_TRANSPORT_ID;
+import static org.briarproject.bramble.test.TestPluginConfigModule.SIMPLEX_TRANSPORT_ID;
+import static org.briarproject.bramble.test.TestUtils.getSecretKey;
+import static org.briarproject.bramble.transport.agreement.TransportKeyAgreementConstants.MSG_KEY_IS_SESSION;
+import static org.briarproject.bramble.util.StringUtils.getRandomString;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertTrue;
+
+public class TransportKeyAgreementIntegrationTest
+		extends BrambleIntegrationTest<TransportKeyAgreementTestComponent> {
+
+	private final File aliceDir = new File(testDir, "alice");
+	private final File bobDir = new File(testDir, "bob");
+	private final SecretKey masterKey = getSecretKey();
+	private final long timestamp = System.currentTimeMillis();
+	private final TransportId newTransportId =
+			new TransportId(getRandomString(8));
+
+	private TransportKeyAgreementTestComponent alice, bob;
+	private Identity aliceIdentity, bobIdentity;
+
+	@Before
+	@Override
+	public void setUp() throws Exception {
+		super.setUp();
+		// Create the devices
+		alice = createComponent(aliceDir, false);
+		bob = createComponent(bobDir, false);
+
+		// Create identities
+		aliceIdentity = alice.getIdentityManager().createIdentity("Alice");
+		bobIdentity = bob.getIdentityManager().createIdentity("Bob");
+
+		// Start both lifecycles
+		startLifecycle(alice, aliceIdentity);
+		startLifecycle(bob, bobIdentity);
+	}
+
+	private TransportKeyAgreementTestComponent createComponent(
+			File dir, boolean useNewTransport) {
+		TestPluginConfigModule pluginConfigModule = useNewTransport ?
+				new TestPluginConfigModule(SIMPLEX_TRANSPORT_ID, newTransportId)
+				: new TestPluginConfigModule();
+		TransportKeyAgreementTestComponent c =
+				DaggerTransportKeyAgreementTestComponent.builder()
+						.testDatabaseConfigModule(
+								new TestDatabaseConfigModule(dir))
+						.testPluginConfigModule(pluginConfigModule)
+						.build();
+		BrambleCoreIntegrationTestEagerSingletons.Helper
+				.injectEagerSingletons(c);
+		return c;
+	}
+
+	private void startLifecycle(
+			TransportKeyAgreementTestComponent device,
+			Identity identity) throws Exception {
+		// Listen to message related events first to not miss early ones
+		addEventListener(device);
+		// Register identity before starting lifecycle
+		device.getIdentityManager().registerIdentity(identity);
+		// Start the lifecycle manager
+		LifecycleManager lifecycleManager = device.getLifecycleManager();
+		lifecycleManager.startServices(masterKey); // re-using masterKey here
+		lifecycleManager.waitForStartup();
+	}
+
+	@After
+	@Override
+	public void tearDown() throws Exception {
+		tearDown(alice);
+		tearDown(bob);
+		super.tearDown();
+	}
+
+	private void tearDown(TransportKeyAgreementTestComponent device)
+			throws Exception {
+		// Stop the lifecycle manager
+		LifecycleManager lifecycleManager = device.getLifecycleManager();
+		lifecycleManager.stopServices();
+		lifecycleManager.waitForShutdown();
+	}
+
+	@Test
+	public void testBothAddTransportAtTheSameTime() throws Exception {
+		// Alice and Bob add each other.
+		Pair<ContactId, ContactId> contactIds = addContacts(true);
+		ContactId aliceId = contactIds.getFirst();
+		ContactId bobId = contactIds.getSecond();
+
+		// Alice and Bob restart and come back with the new transport.
+		alice = restartWithNewTransport(alice, aliceDir, aliceIdentity);
+		bob = restartWithNewTransport(bob, bobDir, bobIdentity);
+
+		// They can still send via the old simplex,
+		// but not via the new duplex transport
+		assertTrue(alice.getKeyManager()
+				.canSendOutgoingStreams(bobId, SIMPLEX_TRANSPORT_ID));
+		assertFalse(alice.getKeyManager()
+				.canSendOutgoingStreams(bobId, newTransportId));
+		assertTrue(bob.getKeyManager()
+				.canSendOutgoingStreams(aliceId, SIMPLEX_TRANSPORT_ID));
+		assertFalse(bob.getKeyManager()
+				.canSendOutgoingStreams(aliceId, newTransportId));
+
+		// Bobs has started a session and sends KEY message to Alice
+		syncMessage(bob, alice, aliceId, 1, true);
+
+		// Alice now and sends her own KEY as well as her ACTIVATE message.
+		syncMessage(alice, bob, bobId, 2, true);
+
+		// Bob can already send over the new transport while Alice still can't.
+		assertFalse(alice.getKeyManager()
+				.canSendOutgoingStreams(bobId, newTransportId));
+		assertTrue(bob.getKeyManager()
+				.canSendOutgoingStreams(aliceId, newTransportId));
+
+		// Now Bob sends his ACTIVATE message to Alice.
+		syncMessage(bob, alice, aliceId, 1, true);
+
+		// Now Alice can also send over the new transport.
+		assertTrue(alice.getKeyManager()
+				.canSendOutgoingStreams(bobId, newTransportId));
+		assertTrue(bob.getKeyManager()
+				.canSendOutgoingStreams(aliceId, newTransportId));
+
+		// Ensure that private key is not stored anymore.
+		assertLocalKeyPairIsNull(alice, bobId);
+		assertLocalKeyPairIsNull(bob, aliceId);
+
+		// Messages can be send over the new transport in both directions.
+		assertTransportMessageArrives(alice, bob, bobId, newTransportId);
+		assertTransportMessageArrives(bob, alice, aliceId, newTransportId);
+	}
+
+	@Test
+	public void testAliceAddsTransportBeforeBob() throws Exception {
+		// Alice and Bob add each other.
+		Pair<ContactId, ContactId> contactIds = addContacts(true);
+		ContactId aliceId = contactIds.getFirst();
+		ContactId bobId = contactIds.getSecond();
+
+		// Alice restarts and comes back with the new transport.
+		alice = restartWithNewTransport(alice, aliceDir, aliceIdentity);
+
+		// Alice can still send via the old simplex,
+		// but not via the new duplex transport
+		assertTrue(alice.getKeyManager()
+				.canSendOutgoingStreams(bobId, SIMPLEX_TRANSPORT_ID));
+		assertFalse(alice.getKeyManager()
+				.canSendOutgoingStreams(bobId, newTransportId));
+
+		// Alice has started a session and sends KEY message to Bob
+		// which he can't read, as he doesn't support the new transport, yet.
+		syncMessage(alice, bob, bobId, 1, false);
+
+		// Bob restarts and comes back with the new transport.
+		bob = restartWithNewTransport(bob, bobDir, bobIdentity);
+
+		// Alice's pending KEY message now gets delivered async, so wait for it
+		awaitPendingMessageDelivery(1);
+
+		// Bob now sends his own KEY as well as his ACTIVATE message.
+		syncMessage(bob, alice, aliceId, 2, true);
+
+		// Alice can already send over the new transport while Bob still can't.
+		assertTrue(alice.getKeyManager()
+				.canSendOutgoingStreams(bobId, newTransportId));
+		assertFalse(bob.getKeyManager()
+				.canSendOutgoingStreams(aliceId, newTransportId));
+
+		// Now Alice sends her ACTIVATE message to Bob.
+		syncMessage(alice, bob, bobId, 1, true);
+
+		// Now Bob can also send over the new transport.
+		assertTrue(alice.getKeyManager()
+				.canSendOutgoingStreams(bobId, newTransportId));
+		assertTrue(bob.getKeyManager()
+				.canSendOutgoingStreams(aliceId, newTransportId));
+
+		// Ensure that private key is not stored anymore.
+		assertLocalKeyPairIsNull(alice, bobId);
+		assertLocalKeyPairIsNull(bob, aliceId);
+
+		// Messages can be send over the new transport in both directions.
+		assertTransportMessageArrives(alice, bob, bobId, newTransportId);
+		assertTransportMessageArrives(bob, alice, aliceId, newTransportId);
+	}
+
+	@Test
+	public void testAliceAlreadyHasTransportWhenAddingBob() throws Exception {
+		// Alice restarts and comes back with the new transport.
+		alice = restartWithNewTransport(alice, aliceDir, aliceIdentity);
+
+		// Alice and Bob add each other.
+		Pair<ContactId, ContactId> contactIds = addContacts(false);
+		ContactId aliceId = contactIds.getFirst();
+		ContactId bobId = contactIds.getSecond();
+
+		// Alice can still send via the old simplex,
+		// but not via the new duplex transport
+		assertTrue(alice.getKeyManager()
+				.canSendOutgoingStreams(bobId, SIMPLEX_TRANSPORT_ID));
+		// Normally, Alice should not be able to send streams already.
+		// However, she does already derive keys for the transport.
+		// The UI checks RemovableDriveManager#isTransportSupportedByContact()
+		// in practice to prevent sending streams that Bob can't decrypt.
+		assertTrue(alice.getKeyManager()
+				.canSendOutgoingStreams(bobId, newTransportId));
+
+		// Bob restarts and comes back with the new transport.
+		bob = restartWithNewTransport(bob, bobDir, bobIdentity);
+
+		// Bob sends his own KEY message.
+		syncMessage(bob, alice, aliceId, 1, true);
+
+		// Alice can already send over the new transport while Bob still can't.
+		assertTrue(alice.getKeyManager()
+				.canSendOutgoingStreams(bobId, newTransportId));
+		assertFalse(bob.getKeyManager()
+				.canSendOutgoingStreams(aliceId, newTransportId));
+
+		// Now Alice sends her KEY and her ACTIVATE message to Bob.
+		syncMessage(alice, bob, bobId, 2, true);
+
+		// Now Bob can also send over the new transport.
+		assertTrue(alice.getKeyManager()
+				.canSendOutgoingStreams(bobId, newTransportId));
+		assertTrue(bob.getKeyManager()
+				.canSendOutgoingStreams(aliceId, newTransportId));
+
+		// Ensure that private key is not stored anymore.
+		assertLocalKeyPairIsNull(alice, bobId);
+		assertLocalKeyPairIsNull(bob, aliceId);
+
+		// Bobs still sends his ACTIVATE message.
+		syncMessage(bob, alice, aliceId, 1, true);
+
+		// Messages can be send over the new transport in both directions.
+		assertTransportMessageArrives(alice, bob, bobId, newTransportId);
+		assertTransportMessageArrives(bob, alice, aliceId, newTransportId);
+	}
+
+	@Test
+	public void testAliceActivatesKeysByIncomingMessage() throws Exception {
+		// Alice and Bob add each other.
+		Pair<ContactId, ContactId> contactIds = addContacts(true);
+		ContactId aliceId = contactIds.getFirst();
+		ContactId bobId = contactIds.getSecond();
+
+		// Alice and Bob restart and come back with the new transport.
+		alice = restartWithNewTransport(alice, aliceDir, aliceIdentity);
+		bob = restartWithNewTransport(bob, bobDir, bobIdentity);
+
+		// They can still send via the old simplex,
+		// but not via the new duplex transport
+		assertTrue(alice.getKeyManager()
+				.canSendOutgoingStreams(bobId, SIMPLEX_TRANSPORT_ID));
+		assertFalse(alice.getKeyManager()
+				.canSendOutgoingStreams(bobId, newTransportId));
+		assertTrue(bob.getKeyManager()
+				.canSendOutgoingStreams(aliceId, SIMPLEX_TRANSPORT_ID));
+		assertFalse(bob.getKeyManager()
+				.canSendOutgoingStreams(aliceId, newTransportId));
+
+		// Bobs has started a session and sends KEY message to Alice
+		syncMessage(bob, alice, aliceId, 1, true);
+
+		// Alice now and sends her own KEY as well as her ACTIVATE message.
+		syncMessage(alice, bob, bobId, 2, true);
+
+		// Bob can already send over the new transport while Alice still can't.
+		assertFalse(alice.getKeyManager()
+				.canSendOutgoingStreams(bobId, newTransportId));
+		assertTrue(bob.getKeyManager()
+				.canSendOutgoingStreams(aliceId, newTransportId));
+
+		// Bob's database mysteriously loses the ACTIVATE message,
+		// so it won't be send to Alice.
+		Contact contact = bob.getContactManager().getContact(aliceId);
+		Group group = getContactGroup(bob, contact);
+		Map<MessageId, BdfDictionary> map = bob.getClientHelper()
+				.getMessageMetadataAsDictionary(group.getId());
+		DatabaseComponent db = bob.getDatabaseComponent();
+		for (Map.Entry<MessageId, BdfDictionary> e : map.entrySet()) {
+			if (e.getValue().getBoolean(MSG_KEY_IS_SESSION)) continue;
+			db.transaction(false, txn -> db.removeMessage(txn, e.getKey()));
+		}
+
+		// Bob sends a message to Alice
+		assertTransportMessageArrives(bob, alice, aliceId, newTransportId);
+
+		// Now without receiving the ACTIVATE, Alice can already send to Bob
+		assertTrue(alice.getKeyManager()
+				.canSendOutgoingStreams(bobId, newTransportId));
+		assertTransportMessageArrives(alice, bob, bobId, newTransportId);
+	}
+
+	private Pair<ContactId, ContactId> addContacts(
+			boolean assertOldDuplexSending) throws Exception {
+		ContactId bobId = addContact(alice, bob, true);
+		ContactId aliceId = addContact(bob, alice, false);
+
+		// Alice and Bob can send messages via the default test transports
+		if (assertOldDuplexSending) {
+			assertTrue(alice.getKeyManager()
+					.canSendOutgoingStreams(bobId, SIMPLEX_TRANSPORT_ID));
+			assertTrue(alice.getKeyManager()
+					.canSendOutgoingStreams(bobId, DUPLEX_TRANSPORT_ID));
+			assertTrue(bob.getKeyManager()
+					.canSendOutgoingStreams(aliceId, SIMPLEX_TRANSPORT_ID));
+			assertTrue(bob.getKeyManager()
+					.canSendOutgoingStreams(aliceId, DUPLEX_TRANSPORT_ID));
+		}
+
+		// Sync initial client versioning updates
+		syncMessage(alice, bob, bobId, 1, true);
+		syncMessage(bob, alice, aliceId, 1, true);
+		syncMessage(alice, bob, bobId, 1, true);
+		sendAcks(bob, alice, aliceId, 1);
+
+		return new Pair<>(aliceId, bobId);
+	}
+
+	private ContactId addContact(
+			TransportKeyAgreementTestComponent device,
+			TransportKeyAgreementTestComponent remote,
+			boolean alice) throws Exception {
+		// Get remote Author
+		Author remoteAuthor = remote.getIdentityManager().getLocalAuthor();
+		// Get ID of LocalAuthor
+		IdentityManager identityManager = device.getIdentityManager();
+		AuthorId localAuthorId = identityManager.getLocalAuthor().getId();
+		// Add the other user as a contact
+		ContactManager contactManager = device.getContactManager();
+		return contactManager.addContact(remoteAuthor, localAuthorId, masterKey,
+				timestamp, alice, true, true);
+	}
+
+	private TransportKeyAgreementTestComponent restartWithNewTransport(
+			TransportKeyAgreementTestComponent device, File dir,
+			Identity identity) throws Exception {
+		tearDown(device);
+		TransportKeyAgreementTestComponent newDevice =
+				createComponent(dir, true);
+		startLifecycle(newDevice, identity);
+		return newDevice;
+	}
+
+	/**
+	 * Asserts that the local key pair (specifically the private key) is removed
+	 * from the session as intended when leaving the AWAIT_KEY state.
+	 * If it remained on disk after the keys had been activated
+	 * then we'd lose forward secrecy.
+	 */
+	private void assertLocalKeyPairIsNull(
+			TransportKeyAgreementTestComponent device, ContactId contactId)
+			throws Exception {
+		Contact contact = device.getContactManager().getContact(contactId);
+		Group group = getContactGroup(device, contact);
+		Map<MessageId, BdfDictionary> map = device.getClientHelper()
+				.getMessageMetadataAsDictionary(group.getId());
+		for (Map.Entry<MessageId, BdfDictionary> e : map.entrySet()) {
+			if (!e.getValue().getBoolean(MSG_KEY_IS_SESSION)) continue;
+			Session s = device.getSessionParser().parseSession(e.getValue());
+			assertNull(s.getLocalKeyPair());
+		}
+	}
+
+	private Group getContactGroup(TransportKeyAgreementTestComponent device,
+			Contact c) {
+		return device.getContactGroupFactory().createContactGroup(CLIENT_ID,
+				MAJOR_VERSION, c);
+	}
+
+	private void assertTransportMessageArrives(
+			TransportKeyAgreementTestComponent from,
+			TransportKeyAgreementTestComponent to, ContactId toId,
+			TransportId transportId) throws Exception {
+		TransportProperties p = new TransportProperties();
+		p.putBoolean("foo", true);
+		from.getTransportPropertyManager().mergeLocalProperties(transportId, p);
+		syncMessage(from, to, toId, transportId, 1, true);
+	}
+
+}

bramble-core/src/test/java/org/briarproject/bramble/transport/agreement/TransportKeyAgreementTestComponent.java

@@ -0,0 +1,40 @@
+package org.briarproject.bramble.transport.agreement;
+
+import org.briarproject.bramble.BrambleCoreModule;
+import org.briarproject.bramble.api.client.ContactGroupFactory;
+import org.briarproject.bramble.api.contact.ContactManager;
+import org.briarproject.bramble.api.db.DatabaseComponent;
+import org.briarproject.bramble.api.lifecycle.LifecycleManager;
+import org.briarproject.bramble.api.properties.TransportPropertyManager;
+import org.briarproject.bramble.api.transport.KeyManager;
+import org.briarproject.bramble.test.BrambleCoreIntegrationTestModule;
+import org.briarproject.bramble.test.BrambleIntegrationTestComponent;
+
+import javax.inject.Singleton;
+
+import dagger.Component;
+
+@Singleton
+@Component(modules = {
+		BrambleCoreIntegrationTestModule.class,
+		BrambleCoreModule.class
+})
+interface TransportKeyAgreementTestComponent
+		extends BrambleIntegrationTestComponent {
+
+	KeyManager getKeyManager();
+
+	TransportKeyAgreementManagerImpl getTransportKeyAgreementManager();
+
+	ContactManager getContactManager();
+
+	LifecycleManager getLifecycleManager();
+
+	ContactGroupFactory getContactGroupFactory();
+
+	SessionParser getSessionParser();
+
+	TransportPropertyManager getTransportPropertyManager();
+
+	DatabaseComponent getDatabaseComponent();
+}

bramble-core/src/test/java/org/briarproject/bramble/transport/agreement/TransportKeyAgreementValidatorTest.java

@@ -0,0 +1,301 @@
+package org.briarproject.bramble.transport.agreement;
+
+import org.briarproject.bramble.api.FormatException;
+import org.briarproject.bramble.api.client.BdfMessageContext;
+import org.briarproject.bramble.api.client.ClientHelper;
+import org.briarproject.bramble.api.data.BdfDictionary;
+import org.briarproject.bramble.api.data.BdfList;
+import org.briarproject.bramble.api.data.MetadataEncoder;
+import org.briarproject.bramble.api.plugin.TransportId;
+import org.briarproject.bramble.api.sync.Group;
+import org.briarproject.bramble.api.sync.Message;
+import org.briarproject.bramble.api.sync.MessageId;
+import org.briarproject.bramble.api.system.Clock;
+import org.briarproject.bramble.test.BrambleMockTestCase;
+import org.jmock.Expectations;
+import org.junit.Test;
+
+import static java.util.Collections.emptyList;
+import static java.util.Collections.singletonList;
+import static org.briarproject.bramble.api.crypto.CryptoConstants.MAX_AGREEMENT_PUBLIC_KEY_BYTES;
+import static org.briarproject.bramble.api.plugin.TransportId.MAX_TRANSPORT_ID_LENGTH;
+import static org.briarproject.bramble.api.system.Clock.MIN_REASONABLE_TIME_MS;
+import static org.briarproject.bramble.api.versioning.ClientVersioningManager.CLIENT_ID;
+import static org.briarproject.bramble.api.versioning.ClientVersioningManager.MAJOR_VERSION;
+import static org.briarproject.bramble.test.TestUtils.getGroup;
+import static org.briarproject.bramble.test.TestUtils.getMessage;
+import static org.briarproject.bramble.test.TestUtils.getRandomBytes;
+import static org.briarproject.bramble.transport.agreement.MessageType.ACTIVATE;
+import static org.briarproject.bramble.transport.agreement.MessageType.KEY;
+import static org.briarproject.bramble.transport.agreement.TransportKeyAgreementConstants.MSG_KEY_PUBLIC_KEY;
+import static org.briarproject.bramble.util.StringUtils.getRandomString;
+import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertEquals;
+
+public class TransportKeyAgreementValidatorTest extends BrambleMockTestCase {
+
+	private final ClientHelper clientHelper = context.mock(ClientHelper.class);
+	private final MetadataEncoder metadataEncoder =
+			context.mock(MetadataEncoder.class);
+	private final Clock clock = context.mock(Clock.class);
+	private final MessageEncoder messageEncoder =
+			context.mock(MessageEncoder.class);
+	private final TransportKeyAgreementValidator validator =
+			new TransportKeyAgreementValidator(clientHelper, metadataEncoder,
+					clock, messageEncoder);
+
+	private final Group group = getGroup(CLIENT_ID, MAJOR_VERSION);
+	private final Message message = getMessage(group.getId());
+
+	@Test(expected = FormatException.class)
+	public void testRejectsEmptyMessage() throws Exception {
+		BdfList body = BdfList.of();
+		validator.validateMessage(message, group, body);
+	}
+
+	@Test(expected = FormatException.class)
+	public void testRejectsNullType() throws Exception {
+		BdfList body = BdfList.of((Object) null);
+		validator.validateMessage(message, group, body);
+	}
+
+	@Test(expected = FormatException.class)
+	public void testRejectsNonLongType() throws Exception {
+		BdfList body = BdfList.of("123");
+		validator.validateMessage(message, group, body);
+	}
+
+	@Test(expected = FormatException.class)
+	public void testRejectsUnknownLongType() throws Exception {
+		BdfList body = BdfList.of(ACTIVATE.getValue() + 1);
+		validator.validateMessage(message, group, body);
+	}
+
+	@Test
+	public void testAcceptsKeyMsg() throws Exception {
+		TransportId transportId = new TransportId(getRandomString(1));
+		context.checking(new Expectations() {{
+			oneOf(messageEncoder)
+					.encodeMessageMetadata(transportId, KEY, false);
+			will(returnValue(new BdfDictionary()));
+		}});
+
+		byte[] publicKey = getRandomBytes(1);
+		BdfList body =
+				BdfList.of(KEY.getValue(), transportId.getString(), publicKey);
+		BdfMessageContext msgCtx =
+				validator.validateMessage(message, group, body);
+		assertEquals(emptyList(), msgCtx.getDependencies());
+		BdfDictionary d = msgCtx.getDictionary();
+		assertArrayEquals(publicKey, d.getRaw(MSG_KEY_PUBLIC_KEY));
+	}
+
+	@Test
+	public void testAcceptsKeyMsgMaxLengths() throws Exception {
+		TransportId transportId =
+				new TransportId(getRandomString(MAX_TRANSPORT_ID_LENGTH));
+		context.checking(new Expectations() {{
+			oneOf(messageEncoder)
+					.encodeMessageMetadata(transportId, KEY, false);
+			will(returnValue(new BdfDictionary()));
+		}});
+
+		byte[] publicKey = getRandomBytes(MAX_AGREEMENT_PUBLIC_KEY_BYTES);
+		BdfList body =
+				BdfList.of(KEY.getValue(), transportId.getString(), publicKey);
+		BdfMessageContext msgCtx =
+				validator.validateMessage(message, group, body);
+		assertEquals(emptyList(), msgCtx.getDependencies());
+		BdfDictionary d = msgCtx.getDictionary();
+		assertArrayEquals(publicKey, d.getRaw(MSG_KEY_PUBLIC_KEY));
+	}
+
+	@Test
+	public void testAcceptsMinTimestampKeyMsg() throws Exception {
+		Message message =
+				getMessage(group.getId(), 1234, MIN_REASONABLE_TIME_MS);
+		TransportId transportId = new TransportId(getRandomString(1));
+		context.checking(new Expectations() {{
+			oneOf(messageEncoder)
+					.encodeMessageMetadata(transportId, KEY, false);
+			will(returnValue(new BdfDictionary()));
+		}});
+
+		byte[] publicKey = getRandomBytes(1);
+		BdfList body =
+				BdfList.of(KEY.getValue(), transportId.getString(), publicKey);
+		BdfMessageContext msgCtx =
+				validator.validateMessage(message, group, body);
+		assertEquals(emptyList(), msgCtx.getDependencies());
+		BdfDictionary d = msgCtx.getDictionary();
+		assertArrayEquals(publicKey, d.getRaw(MSG_KEY_PUBLIC_KEY));
+	}
+
+	@Test(expected = FormatException.class)
+	public void testRejectsTooLongKeyMsg() throws Exception {
+		BdfList body = BdfList.of(KEY.getValue(), getRandomString(1),
+				getRandomBytes(1), 1);
+		validator.validateMessage(message, group, body);
+	}
+
+	@Test(expected = FormatException.class)
+	public void testRejectsTooShortKeyMsg() throws Exception {
+		BdfList body = BdfList.of(KEY.getValue(), getRandomString(1));
+		validator.validateMessage(message, group, body);
+	}
+
+	@Test(expected = FormatException.class)
+	public void testRejectsEmptyTransportIdKeyMsg() throws Exception {
+		BdfList body = BdfList.of(KEY.getValue(), "", getRandomBytes(1));
+		validator.validateMessage(message, group, body);
+	}
+
+	@Test(expected = FormatException.class)
+	public void testRejectsTooLongTransportIdKeyMsg() throws Exception {
+		BdfList body = BdfList.of(KEY.getValue(),
+				getRandomString(MAX_TRANSPORT_ID_LENGTH + 1),
+				getRandomBytes(1));
+		validator.validateMessage(message, group, body);
+	}
+
+	@Test(expected = FormatException.class)
+	public void testRejectsNonStringTransportIdKeyMsg() throws Exception {
+		BdfList body = BdfList.of(KEY.getValue(),
+				getRandomBytes(MAX_TRANSPORT_ID_LENGTH),
+				getRandomBytes(1));
+		validator.validateMessage(message, group, body);
+	}
+
+	@Test(expected = FormatException.class)
+	public void testRejectsEmptyPublicKeyKeyMsg() throws Exception {
+		BdfList body = BdfList.of(KEY.getValue(),
+				getRandomString(1),
+				getRandomBytes(0));
+		validator.validateMessage(message, group, body);
+	}
+
+	@Test(expected = FormatException.class)
+	public void testRejectsTooLongPublicKeyKeyMsg() throws Exception {
+		BdfList body = BdfList.of(KEY.getValue(),
+				getRandomString(1),
+				getRandomBytes(MAX_AGREEMENT_PUBLIC_KEY_BYTES + 1));
+		validator.validateMessage(message, group, body);
+	}
+
+	@Test(expected = FormatException.class)
+	public void testRejectsNonBytesPublicKeyKeyMsg() throws Exception {
+		BdfList body = BdfList.of(KEY.getValue(),
+				getRandomString(1),
+				getRandomString(MAX_AGREEMENT_PUBLIC_KEY_BYTES));
+		validator.validateMessage(message, group, body);
+	}
+
+	@Test(expected = FormatException.class)
+	public void testRejectsTooOldTimestampKeyMsg() throws Exception {
+		Message message =
+				getMessage(group.getId(), 1234, MIN_REASONABLE_TIME_MS - 1);
+		BdfList body = BdfList.of(KEY.getValue(), getRandomString(1),
+				getRandomBytes(1));
+		validator.validateMessage(message, group, body);
+	}
+
+	@Test
+	public void testAcceptsActivateMsg() throws Exception {
+		TransportId transportId = new TransportId(getRandomString(1));
+		BdfDictionary meta = new BdfDictionary();
+		context.checking(new Expectations() {{
+			oneOf(messageEncoder)
+					.encodeMessageMetadata(transportId, ACTIVATE, false);
+			will(returnValue(meta));
+		}});
+
+		MessageId msgId = new MessageId(getRandomBytes(MessageId.LENGTH));
+		BdfList body = BdfList.of(ACTIVATE.getValue(), transportId.getString(),
+				msgId.getBytes());
+
+		BdfMessageContext msgCtx =
+				validator.validateMessage(message, group, body);
+		assertEquals(singletonList(msgId), msgCtx.getDependencies());
+		assertEquals(meta, msgCtx.getDictionary());
+	}
+
+	@Test
+	public void testAcceptsActivateMsgMaxTransportIdLength() throws Exception {
+		TransportId transportId =
+				new TransportId(getRandomString(MAX_TRANSPORT_ID_LENGTH));
+		BdfDictionary meta = new BdfDictionary();
+		context.checking(new Expectations() {{
+			oneOf(messageEncoder)
+					.encodeMessageMetadata(transportId, ACTIVATE, false);
+			will(returnValue(meta));
+		}});
+
+		MessageId msgId = new MessageId(getRandomBytes(MessageId.LENGTH));
+		BdfList body = BdfList.of(ACTIVATE.getValue(), transportId.getString(),
+				msgId.getBytes());
+
+		BdfMessageContext msgCtx =
+				validator.validateMessage(message, group, body);
+		assertEquals(singletonList(msgId), msgCtx.getDependencies());
+		assertEquals(meta, msgCtx.getDictionary());
+	}
+
+	@Test(expected = FormatException.class)
+	public void testRejectsTooLongActivateMsg() throws Exception {
+		BdfList body = BdfList.of(ACTIVATE.getValue(), getRandomString(1),
+				getRandomBytes(MessageId.LENGTH), 1);
+		validator.validateMessage(message, group, body);
+	}
+
+	@Test(expected = FormatException.class)
+	public void testRejectsTooShortActivateMsg() throws Exception {
+		BdfList body = BdfList.of(ACTIVATE.getValue(), getRandomString(1));
+		validator.validateMessage(message, group, body);
+	}
+
+	@Test(expected = FormatException.class)
+	public void testRejectsEmptyTransportIdActivateMsg() throws Exception {
+		BdfList body = BdfList.of(ACTIVATE.getValue(), "",
+				getRandomBytes(MessageId.LENGTH));
+		validator.validateMessage(message, group, body);
+	}
+
+	@Test(expected = FormatException.class)
+	public void testRejectsNonStringTransportIdActivateMsg() throws Exception {
+		BdfList body = BdfList.of(ACTIVATE.getValue(), 123,
+				getRandomBytes(MessageId.LENGTH));
+		validator.validateMessage(message, group, body);
+	}
+
+	@Test(expected = FormatException.class)
+	public void testRejectsTooLongTransportIdActivateMsg() throws Exception {
+		BdfList body = BdfList.of(ACTIVATE.getValue(),
+				getRandomString(MAX_TRANSPORT_ID_LENGTH + 1),
+				getRandomBytes(MessageId.LENGTH));
+		validator.validateMessage(message, group, body);
+	}
+
+	@Test(expected = FormatException.class)
+	public void testRejectsTooShortMsgIdActivateMsg() throws Exception {
+		BdfList body = BdfList.of(ACTIVATE.getValue(),
+				getRandomString(1),
+				getRandomBytes(MessageId.LENGTH - 1));
+		validator.validateMessage(message, group, body);
+	}
+
+	@Test(expected = FormatException.class)
+	public void testRejectsTooLongMsgIdActivateMsg() throws Exception {
+		BdfList body = BdfList.of(ACTIVATE.getValue(),
+				getRandomString(1),
+				getRandomBytes(MessageId.LENGTH + 1));
+		validator.validateMessage(message, group, body);
+	}
+
+	@Test(expected = FormatException.class)
+	public void testRejectsNonByteMsgIdActivateMsg() throws Exception {
+		BdfList body = BdfList.of(ACTIVATE.getValue(),
+				getRandomString(1),
+				getRandomString(MessageId.LENGTH));
+		validator.validateMessage(message, group, body);
+	}
+}

bramble-core/witness.gradle

@@ -1,11 +1,12 @@
 dependencyVerification {
     verify = [
-        'cglib:cglib:3.2.0:cglib-3.2.0.jar:adb13bab79712ad6bdf1bd59f2a3918018a8016e722e8a357065afb9e6690861',
+        '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',
-        'com.google.dagger:dagger-compiler:2.24:dagger-compiler-2.24.jar:3c5afb955fb188da485cb2c048eff37dce0e1530b9780a0f2f7187d16d1ccc1f',
-        'com.google.dagger:dagger-producers:2.24:dagger-producers-2.24.jar:f10f45b95191954d5d6b043fca9e62fb621d21bf70634b8f8476c7988b504c3a',
-        'com.google.dagger:dagger-spi:2.24:dagger-spi-2.24.jar:c038445d14dbcb4054e61bf49e05009edf26fce4fdc7ec1a9db544784f68e718',
-        'com.google.dagger:dagger:2.24:dagger-2.24.jar:550a6e46a6dfcdf1d764887b6090cea94f783327e50e5c73754f18facfc70b64',
+        'com.google.dagger:dagger-compiler:2.33:dagger-compiler-2.33.jar:aa8a0d8370c578fd6999802d0d90b9829377a46d2c1141e11b8f737970e7155e',
+        'com.google.dagger:dagger-producers:2.33:dagger-producers-2.33.jar:5897f0b6eef799c2adfe3ccacc58c0fb374d58acb063c3ebe5366c38a8bce5c8',
+        'com.google.dagger:dagger-spi:2.33:dagger-spi-2.33.jar:e2dcab2221b8afb9556ef0a1c83b0bd5f42552e254322a257330f754cdbbb9d4',
+        'com.google.dagger:dagger:2.33:dagger-2.33.jar:d8798c5b8cf6b125234e33af5c6293bb9f2208ce29b57924c35b8c0be7b6bdcb',
         'com.google.errorprone:error_prone_annotations:2.2.0:error_prone_annotations-2.2.0.jar:6ebd22ca1b9d8ec06d41de8d64e0596981d9607b42035f9ed374f9de271a481a',
         'com.google.errorprone:javac-shaded:9-dev-r4023-3:javac-shaded-9-dev-r4023-3.jar:65bfccf60986c47fbc17c9ebab0be626afc41741e0a6ec7109e0768817a36f30',
         'com.google.googlejavaformat:google-java-format:1.5:google-java-format-1.5.jar:aa19ad7850fb85178aa22f2fddb163b84d6ce4d0035872f30d4408195ca1144e',
@@ -15,15 +16,16 @@ dependencyVerification {
         'com.google.j2objc:j2objc-annotations:1.1:j2objc-annotations-1.1.jar:2994a7eb78f2710bd3d3bfb639b2c94e219cedac0d4d084d516e78c16dddecf6',
         'com.h2database:h2:1.4.192:h2-1.4.192.jar:225b22e9857235c46c93861410b60b8c81c10dc8985f4faf188985ba5445126c',
         'com.madgag.spongycastle:core:1.58.0.0:core-1.58.0.0.jar:199617dd5698c5a9312b898c0a4cec7ce9dd8649d07f65d91629f58229d72728',
-        'com.squareup:javapoet:1.11.1:javapoet-1.11.1.jar:9cbf2107be499ec6e95afd36b58e3ca122a24166cdd375732e51267d64058e90',
+        'com.squareup:javapoet:1.13.0:javapoet-1.13.0.jar:4c7517e848a71b36d069d12bb3bf46a70fd4cda3105d822b0ed2e19c00b69291',
         'javax.annotation:jsr250-api:1.0:jsr250-api-1.0.jar:a1a922d0d9b6d183ed3800dfac01d1e1eb159f0e8c6f94736931c1def54a941f',
         'javax.inject:javax.inject:1:javax.inject-1.jar:91c77044a50c481636c32d916fd89c9118a72195390452c81065080f957de7ff',
-        'junit:junit:4.12:junit-4.12.jar:59721f0805e223d84b90677887d9ff567dc534d7c502ca903c0c2b17f05c116a',
+        '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',
         'net.i2p.crypto:eddsa:0.2.0:eddsa-0.2.0.jar:a7cb1b85c16e2f0730b9204106929a1d9aaae1df728adc7041a8b8b605692140',
+        'net.jcip:jcip-annotations:1.0:jcip-annotations-1.0.jar:be5805392060c71474bf6c9a67a099471274d30b83eef84bfc4e0889a4f1dcc0',
+        'net.jodah:concurrentunit:0.4.2:concurrentunit-0.4.2.jar:5583078e1acf91734939e985bc9e7ee947b0e93a8eef679da6bb07bbeb47ced3',
         'net.ltgt.gradle.incap:incap:0.2:incap-0.2.jar:b625b9806b0f1e4bc7a2e3457119488de3cd57ea20feedd513db070a573a4ffd',
-        'org.apache.ant:ant-launcher:1.9.4:ant-launcher-1.9.4.jar:7bccea20b41801ca17bcbc909a78c835d0f443f12d639c77bd6ae3d05861608d',
-        'org.apache.ant:ant:1.9.4:ant-1.9.4.jar:649ae0730251de07b8913f49286d46bba7b92d47c5f332610aa426c4f02161d8',
-        'org.beanshell:bsh:1.3.0:bsh-1.3.0.jar:9b04edc75d19db54f1b4e8b5355e9364384c6cf71eb0a1b9724c159d779879f8',
+        'org.apache-extras.beanshell:bsh:2.0b6:bsh-2.0b6.jar:a17955976070c0573235ee662f2794a78082758b61accffce8d3f8aedcd91047',
         'org.bitlet:weupnp:0.1.4:weupnp-0.1.4.jar:88df7e6504929d00bdb832863761385c68ab92af945b04f0770b126270a444fb',
         'org.briarproject:jtorctl:0.3:jtorctl-0.3.jar:f2939238a097898998432effe93b0334d97a787972ab3a91a8973a1d309fc864',
         'org.checkerframework:checker-compat-qual:2.5.3:checker-compat-qual-2.5.3.jar:d76b9afea61c7c082908023f0cbc1427fab9abd2df915c8b8a3e7a509bccbc6d',
@@ -32,16 +34,22 @@ dependencyVerification {
         'org.codehaus.mojo:animal-sniffer-annotations:1.17:animal-sniffer-annotations-1.17.jar:92654f493ecfec52082e76354f0ebf87648dc3d5cec2e3c3cdb947c016747a53',
         'org.codehaus.mojo:animal-sniffer-ant-tasks:1.16:animal-sniffer-ant-tasks-1.16.jar:890040976fbe2d584619a6a61b1fd2e925b3b5eb342a85eb2762c467c0d64e90',
         'org.codehaus.mojo:animal-sniffer:1.16:animal-sniffer-1.16.jar:72be8bcc226ba43b937c722a08a07852bfa1b11400089265d5df0ee7b38b1d52',
-        'org.hamcrest:hamcrest-core:1.3:hamcrest-core-1.3.jar:66fdef91e9739348df7a096aa384a5685f4e875584cce89386a7a47251c4d8e9',
-        'org.hamcrest:hamcrest-library:1.3:hamcrest-library-1.3.jar:711d64522f9ec410983bd310934296da134be4254a125080a0416ec178dfad1c',
+        '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',
         'org.hsqldb:hsqldb:2.3.5:hsqldb-2.3.5.jar:6676a6977ac98997a80f827ddbd3fe8ca1e0853dad1492512135fd1a222ccfad',
-        'org.jmock:jmock-junit4:2.8.2:jmock-junit4-2.8.2.jar:f7ee4df4f7bd7b7f1cafad3b99eb74d579f109d5992ff625347352edb55e674c',
-        'org.jmock:jmock-legacy:2.8.2:jmock-legacy-2.8.2.jar:f2b985a5c08a9edb7f37612330c058809da3f6a6d63ce792426ebf8ff0d6d31b',
-        'org.jmock:jmock-testjar:2.8.2:jmock-testjar-2.8.2.jar:8900860f72c474e027cf97fe78dcbf154a1aa7fc62b6845c5fb4e4f3c7bc8760',
-        'org.jmock:jmock:2.8.2:jmock-2.8.2.jar:6c73cb4a2e6dbfb61fd99c9a768539c170ab6568e57846bd60dbf19596b65b16',
-        'org.objenesis:objenesis:2.1:objenesis-2.1.jar:c74330cc6b806c804fd37e74487b4fe5d7c2750c5e15fbc6efa13bdee1bdef80',
+        'org.jetbrains.kotlin:kotlin-stdlib-common:1.4.20:kotlin-stdlib-common-1.4.20.jar:a7112c9b3cefee418286c9c9372f7af992bd1e6e030691d52f60cb36dbec8320',
+        'org.jetbrains.kotlin:kotlin-stdlib:1.4.20:kotlin-stdlib-1.4.20.jar:b8ab1da5cdc89cb084d41e1f28f20a42bd431538642a5741c52bbfae3fa3e656',
+        'org.jetbrains.kotlinx:kotlinx-metadata-jvm:0.1.0:kotlinx-metadata-jvm-0.1.0.jar:9753bb39efef35957c5c15df9a3cb769aabf2cdfa74b47afcb7760e5146be3b5',
+        'org.jetbrains:annotations:13.0:annotations-13.0.jar:ace2a10dc8e2d5fd34925ecac03e4988b2c0f851650c94b8cef49ba1bd111478',
+        'org.jmock:jmock-imposters:2.12.0:jmock-imposters-2.12.0.jar:3b836269745a137c9b2347e8d7c2104845b126ef04f012d6bfd94f1a7dea7b09',
+        'org.jmock:jmock-junit4:2.12.0:jmock-junit4-2.12.0.jar:3233062fc889637c151a24f1ee086bad04321ab7d8264fef279daff0fa27205b',
+        'org.jmock:jmock-legacy:2.12.0:jmock-legacy-2.12.0.jar:dea3a9cca653d082e2fe7e40232e982fe03a9984c7d67ceff24f3e03fe580dcd',
+        'org.jmock:jmock-testjar:2.12.0:jmock-testjar-2.12.0.jar:efefbcf6cd294d0e29f0c46eb2a3380d4ca4e1763ff719c69e2f2ac62f564a04',
+        '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-all:5.2:asm-all-5.2.jar:7fbffbc1db3422e2101689fd88df8384b15817b52b9b2b267b9f6d2511dc198d',
-        'org.ow2.asm:asm:5.0.4:asm-5.0.4.jar:896618ed8ae62702521a78bc7be42b7c491a08e6920a15f89a3ecdec31e9a220',
+        'org.ow2.asm:asm:7.1:asm-7.1.jar:4ab2fa2b6d2cc9ccb1eaa05ea329c407b47b13ed2915f62f8c4b8cc96258d4de',
         'org.whispersystems:curve25519-java:0.5.0:curve25519-java-0.5.0.jar:0aadd43cf01d11e9b58f867b3c4f25c3194e8b0623d1953d32dfbfbee009e38d',
     ]
 }

bramble-java/build.gradle

@@ -14,21 +14,22 @@ configurations {
 dependencies {
 	implementation project(path: ':bramble-core', configuration: 'default')
 	implementation fileTree(dir: 'libs', include: '*.jar')
-	implementation 'net.java.dev.jna:jna:4.5.2'
-	implementation 'net.java.dev.jna:jna-platform:4.5.2'
-	tor 'org.briarproject:tor:0.3.5.13-1@zip'
+	def jna_version = '4.5.2'
+	implementation "net.java.dev.jna:jna:$jna_version"
+	implementation "net.java.dev.jna:jna-platform:$jna_version"
+	tor 'org.briarproject:tor:0.3.5.15'
 	tor 'org.briarproject:obfs4proxy:0.0.12-dev-40245c4a@zip'
 
-	annotationProcessor 'com.google.dagger:dagger-compiler:2.24'
+	annotationProcessor "com.google.dagger:dagger-compiler:$dagger_version"
 
 	testImplementation project(path: ':bramble-api', configuration: 'testOutput')
 	testImplementation project(path: ':bramble-core', configuration: 'testOutput')
-	testImplementation 'junit:junit:4.12'
-	testImplementation "org.jmock:jmock:2.8.2"
-	testImplementation "org.jmock:jmock-junit4:2.8.2"
-	testImplementation "org.jmock:jmock-legacy:2.8.2"
+	testImplementation "junit:junit:$junit_version"
+	testImplementation "org.jmock:jmock:$jmock_version"
+	testImplementation "org.jmock:jmock-junit4:$jmock_version"
+	testImplementation "org.jmock:jmock-legacy:$jmock_version"
 
-	testAnnotationProcessor 'com.google.dagger:dagger-compiler:2.24'
+	testAnnotationProcessor "com.google.dagger:dagger-compiler:$dagger_version"
 }
 
 def torBinariesDir = 'src/main/resources'

bramble-java/src/main/java/org/briarproject/bramble/plugin/bluetooth/JavaBluetoothPlugin.java

@@ -41,7 +41,7 @@ class JavaBluetoothPlugin extends
 			SecureRandom secureRandom,
 			Backoff backoff,
 			PluginCallback callback,
-			int maxLatency,
+			long maxLatency,
 			int maxIdleTime) {
 		super(connectionManager, connectionFactory, ioExecutor,
 				wakefulIoExecutor, secureRandom, backoff, callback,

bramble-java/src/main/java/org/briarproject/bramble/plugin/bluetooth/JavaBluetoothPluginFactory.java

@@ -58,7 +58,7 @@ public class JavaBluetoothPluginFactory implements DuplexPluginFactory {
 	}
 
 	@Override
-	public int getMaxLatency() {
+	public long getMaxLatency() {
 		return MAX_LATENCY;
 	}
 

bramble-java/src/main/java/org/briarproject/bramble/plugin/modem/ModemPlugin.java

@@ -50,14 +50,14 @@ class ModemPlugin implements DuplexPlugin, Modem.Callback {
 	private final ModemFactory modemFactory;
 	private final SerialPortList serialPortList;
 	private final PluginCallback callback;
-	private final int maxLatency;
+	private final long maxLatency;
 	private final AtomicBoolean used = new AtomicBoolean(false);
 	private final PluginState state = new PluginState();
 
 	private volatile Modem modem = null;
 
 	ModemPlugin(ModemFactory modemFactory, SerialPortList serialPortList,
-			PluginCallback callback, int maxLatency) {
+			PluginCallback callback, long maxLatency) {
 		this.modemFactory = modemFactory;
 		this.serialPortList = serialPortList;
 		this.callback = callback;
@@ -70,7 +70,7 @@ class ModemPlugin implements DuplexPlugin, Modem.Callback {
 	}
 
 	@Override
-	public int getMaxLatency() {
+	public long getMaxLatency() {
 		return maxLatency;
 	}
 

bramble-java/src/main/java/org/briarproject/bramble/plugin/modem/ModemPluginFactory.java

@@ -36,7 +36,7 @@ public class ModemPluginFactory implements DuplexPluginFactory {
 	}
 
 	@Override
-	public int getMaxLatency() {
+	public long getMaxLatency() {
 		return MAX_LATENCY;
 	}
 

bramble-java/src/main/java/org/briarproject/bramble/plugin/tor/JavaTorPlugin.java

@@ -33,7 +33,7 @@ abstract class JavaTorPlugin extends TorPlugin {
 			TorRendezvousCrypto torRendezvousCrypto,
 			PluginCallback callback,
 			String architecture,
-			int maxLatency,
+			long maxLatency,
 			int maxIdleTime,
 			File torDirectory) {
 		super(ioExecutor, wakefulIoExecutor, networkManager, locationUtils,

bramble-java/src/main/java/org/briarproject/bramble/plugin/tor/UnixTorPlugin.java

@@ -33,7 +33,7 @@ class UnixTorPlugin extends JavaTorPlugin {
 			TorRendezvousCrypto torRendezvousCrypto,
 			PluginCallback callback,
 			String architecture,
-			int maxLatency,
+			long maxLatency,
 			int maxIdleTime,
 			File torDirectory) {
 		super(ioExecutor, wakefulIoExecutor, networkManager, locationUtils,

bramble-java/src/main/java/org/briarproject/bramble/plugin/tor/UnixTorPluginFactory.java

@@ -16,6 +16,7 @@ import org.briarproject.bramble.api.plugin.duplex.DuplexPluginFactory;
 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 java.io.File;
 import java.util.concurrent.Executor;
@@ -56,7 +57,7 @@ public class UnixTorPluginFactory implements DuplexPluginFactory {
 
 	@Inject
 	UnixTorPluginFactory(@IoExecutor Executor ioExecutor,
-			@IoExecutor Executor wakefulIoExecutor,
+			@WakefulIoExecutor Executor wakefulIoExecutor,
 			NetworkManager networkManager,
 			LocationUtils locationUtils,
 			EventBus eventBus,
@@ -87,7 +88,7 @@ public class UnixTorPluginFactory implements DuplexPluginFactory {
 	}
 
 	@Override
-	public int getMaxLatency() {
+	public long getMaxLatency() {
 		return MAX_LATENCY;
 	}
 

bramble-java/witness.gradle

@@ -1,11 +1,12 @@
 dependencyVerification {
     verify = [
-        'cglib:cglib:3.2.0:cglib-3.2.0.jar:adb13bab79712ad6bdf1bd59f2a3918018a8016e722e8a357065afb9e6690861',
+        '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',
-        'com.google.dagger:dagger-compiler:2.24:dagger-compiler-2.24.jar:3c5afb955fb188da485cb2c048eff37dce0e1530b9780a0f2f7187d16d1ccc1f',
-        'com.google.dagger:dagger-producers:2.24:dagger-producers-2.24.jar:f10f45b95191954d5d6b043fca9e62fb621d21bf70634b8f8476c7988b504c3a',
-        'com.google.dagger:dagger-spi:2.24:dagger-spi-2.24.jar:c038445d14dbcb4054e61bf49e05009edf26fce4fdc7ec1a9db544784f68e718',
-        'com.google.dagger:dagger:2.24:dagger-2.24.jar:550a6e46a6dfcdf1d764887b6090cea94f783327e50e5c73754f18facfc70b64',
+        'com.google.dagger:dagger-compiler:2.33:dagger-compiler-2.33.jar:aa8a0d8370c578fd6999802d0d90b9829377a46d2c1141e11b8f737970e7155e',
+        'com.google.dagger:dagger-producers:2.33:dagger-producers-2.33.jar:5897f0b6eef799c2adfe3ccacc58c0fb374d58acb063c3ebe5366c38a8bce5c8',
+        'com.google.dagger:dagger-spi:2.33:dagger-spi-2.33.jar:e2dcab2221b8afb9556ef0a1c83b0bd5f42552e254322a257330f754cdbbb9d4',
+        'com.google.dagger:dagger:2.33:dagger-2.33.jar:d8798c5b8cf6b125234e33af5c6293bb9f2208ce29b57924c35b8c0be7b6bdcb',
         'com.google.errorprone:error_prone_annotations:2.2.0:error_prone_annotations-2.2.0.jar:6ebd22ca1b9d8ec06d41de8d64e0596981d9607b42035f9ed374f9de271a481a',
         'com.google.errorprone:javac-shaded:9-dev-r4023-3:javac-shaded-9-dev-r4023-3.jar:65bfccf60986c47fbc17c9ebab0be626afc41741e0a6ec7109e0768817a36f30',
         'com.google.googlejavaformat:google-java-format:1.5:google-java-format-1.5.jar:aa19ad7850fb85178aa22f2fddb163b84d6ce4d0035872f30d4408195ca1144e',
@@ -13,28 +14,34 @@ dependencyVerification {
         'com.google.guava:guava:27.1-jre:guava-27.1-jre.jar:4a5aa70cc968a4d137e599ad37553e5cfeed2265e8c193476d7119036c536fe7',
         'com.google.guava:listenablefuture:9999.0-empty-to-avoid-conflict-with-guava:listenablefuture-9999.0-empty-to-avoid-conflict-with-guava.jar:b372a037d4230aa57fbeffdef30fd6123f9c0c2db85d0aced00c91b974f33f99',
         'com.google.j2objc:j2objc-annotations:1.1:j2objc-annotations-1.1.jar:2994a7eb78f2710bd3d3bfb639b2c94e219cedac0d4d084d516e78c16dddecf6',
-        'com.squareup:javapoet:1.11.1:javapoet-1.11.1.jar:9cbf2107be499ec6e95afd36b58e3ca122a24166cdd375732e51267d64058e90',
+        'com.squareup:javapoet:1.13.0:javapoet-1.13.0.jar:4c7517e848a71b36d069d12bb3bf46a70fd4cda3105d822b0ed2e19c00b69291',
         'javax.annotation:jsr250-api:1.0:jsr250-api-1.0.jar:a1a922d0d9b6d183ed3800dfac01d1e1eb159f0e8c6f94736931c1def54a941f',
         'javax.inject:javax.inject:1:javax.inject-1.jar:91c77044a50c481636c32d916fd89c9118a72195390452c81065080f957de7ff',
-        'junit:junit:4.12:junit-4.12.jar:59721f0805e223d84b90677887d9ff567dc534d7c502ca903c0c2b17f05c116a',
+        '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',
         'net.java.dev.jna:jna-platform:4.5.2:jna-platform-4.5.2.jar:f1d00c167d8921c6e23c626ef9f1c3ae0be473c95c68ffa012bc7ae55a87e2d6',
         'net.java.dev.jna:jna:4.5.2:jna-4.5.2.jar:0c8eb7acf67261656d79005191debaba3b6bf5dd60a43735a245429381dbecff',
+        'net.jcip:jcip-annotations:1.0:jcip-annotations-1.0.jar:be5805392060c71474bf6c9a67a099471274d30b83eef84bfc4e0889a4f1dcc0',
         'net.ltgt.gradle.incap:incap:0.2:incap-0.2.jar:b625b9806b0f1e4bc7a2e3457119488de3cd57ea20feedd513db070a573a4ffd',
-        'org.apache.ant:ant-launcher:1.9.4:ant-launcher-1.9.4.jar:7bccea20b41801ca17bcbc909a78c835d0f443f12d639c77bd6ae3d05861608d',
-        'org.apache.ant:ant:1.9.4:ant-1.9.4.jar:649ae0730251de07b8913f49286d46bba7b92d47c5f332610aa426c4f02161d8',
-        'org.beanshell:bsh:1.3.0:bsh-1.3.0.jar:9b04edc75d19db54f1b4e8b5355e9364384c6cf71eb0a1b9724c159d779879f8',
+        'org.apache-extras.beanshell:bsh:2.0b6:bsh-2.0b6.jar:a17955976070c0573235ee662f2794a78082758b61accffce8d3f8aedcd91047',
         'org.briarproject:obfs4proxy:0.0.12-dev-40245c4a:obfs4proxy-0.0.12-dev-40245c4a.zip:172029e7058b3a83ac93ac4991a44bf76e16ce8d46f558f5836d57da3cb3a766',
-        'org.briarproject:tor:0.3.5.13-1:tor-0.3.5.13-1.zip:ef35c16bf8dc1f4c75ed71d9f55e4514f383d124ec96b859aca647c990927c99',
+        'org.briarproject:tor:0.3.5.15:tor-0.3.5.15.jar:2ff5b5a3b5eaa97d699629ad24ba9584b3199d0ffdb1ea7d8a02de3016b80e7a',
         'org.checkerframework:checker-compat-qual:2.5.3:checker-compat-qual-2.5.3.jar:d76b9afea61c7c082908023f0cbc1427fab9abd2df915c8b8a3e7a509bccbc6d',
         'org.checkerframework:checker-qual:2.5.2:checker-qual-2.5.2.jar:64b02691c8b9d4e7700f8ee2e742dce7ea2c6e81e662b7522c9ee3bf568c040a',
         'org.codehaus.mojo:animal-sniffer-annotations:1.17:animal-sniffer-annotations-1.17.jar:92654f493ecfec52082e76354f0ebf87648dc3d5cec2e3c3cdb947c016747a53',
-        'org.hamcrest:hamcrest-core:1.3:hamcrest-core-1.3.jar:66fdef91e9739348df7a096aa384a5685f4e875584cce89386a7a47251c4d8e9',
-        'org.hamcrest:hamcrest-library:1.3:hamcrest-library-1.3.jar:711d64522f9ec410983bd310934296da134be4254a125080a0416ec178dfad1c',
-        'org.jmock:jmock-junit4:2.8.2:jmock-junit4-2.8.2.jar:f7ee4df4f7bd7b7f1cafad3b99eb74d579f109d5992ff625347352edb55e674c',
-        'org.jmock:jmock-legacy:2.8.2:jmock-legacy-2.8.2.jar:f2b985a5c08a9edb7f37612330c058809da3f6a6d63ce792426ebf8ff0d6d31b',
-        'org.jmock:jmock-testjar:2.8.2:jmock-testjar-2.8.2.jar:8900860f72c474e027cf97fe78dcbf154a1aa7fc62b6845c5fb4e4f3c7bc8760',
-        'org.jmock:jmock:2.8.2:jmock-2.8.2.jar:6c73cb4a2e6dbfb61fd99c9a768539c170ab6568e57846bd60dbf19596b65b16',
-        'org.objenesis:objenesis:2.1:objenesis-2.1.jar:c74330cc6b806c804fd37e74487b4fe5d7c2750c5e15fbc6efa13bdee1bdef80',
-        'org.ow2.asm:asm:5.0.4:asm-5.0.4.jar:896618ed8ae62702521a78bc7be42b7c491a08e6920a15f89a3ecdec31e9a220',
+        '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',
+        'org.jetbrains.kotlin:kotlin-stdlib-common:1.4.20:kotlin-stdlib-common-1.4.20.jar:a7112c9b3cefee418286c9c9372f7af992bd1e6e030691d52f60cb36dbec8320',
+        'org.jetbrains.kotlin:kotlin-stdlib:1.4.20:kotlin-stdlib-1.4.20.jar:b8ab1da5cdc89cb084d41e1f28f20a42bd431538642a5741c52bbfae3fa3e656',
+        'org.jetbrains.kotlinx:kotlinx-metadata-jvm:0.1.0:kotlinx-metadata-jvm-0.1.0.jar:9753bb39efef35957c5c15df9a3cb769aabf2cdfa74b47afcb7760e5146be3b5',
+        'org.jetbrains:annotations:13.0:annotations-13.0.jar:ace2a10dc8e2d5fd34925ecac03e4988b2c0f851650c94b8cef49ba1bd111478',
+        'org.jmock:jmock-imposters:2.12.0:jmock-imposters-2.12.0.jar:3b836269745a137c9b2347e8d7c2104845b126ef04f012d6bfd94f1a7dea7b09',
+        'org.jmock:jmock-junit4:2.12.0:jmock-junit4-2.12.0.jar:3233062fc889637c151a24f1ee086bad04321ab7d8264fef279daff0fa27205b',
+        'org.jmock:jmock-legacy:2.12.0:jmock-legacy-2.12.0.jar:dea3a9cca653d082e2fe7e40232e982fe03a9984c7d67ceff24f3e03fe580dcd',
+        'org.jmock:jmock-testjar:2.12.0:jmock-testjar-2.12.0.jar:efefbcf6cd294d0e29f0c46eb2a3380d4ca4e1763ff719c69e2f2ac62f564a04',
+        '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',
     ]
 }

briar-android/artwork/transfer_data.svg

@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:cc="http://creativecommons.org/ns#"
+    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://www.w3.org/2000/svg"
+    xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+    xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape" width="155" height="155"
+    viewBox="0 0 155 158.05972" fill="none" version="1.1" id="svg24"
+    sodipodi:docname="transfer_data.svg" inkscape:version="1.0.2 (e86c870879, 2021-01-15)">
+  <defs id="defs11" />
+  <sodipodi:namedview pagecolor="#ffffff" bordercolor="#666666" borderopacity="1"
+      objecttolerance="10" gridtolerance="10" guidetolerance="10" inkscape:pageopacity="0"
+      inkscape:pageshadow="2" inkscape:window-width="1920" inkscape:window-height="982"
+      id="namedview9" showgrid="false" inkscape:zoom="1.4523073" inkscape:cx="8.2820655"
+      inkscape:cy="-28.56208" inkscape:window-x="1920" inkscape:window-y="72"
+      inkscape:window-maximized="0" inkscape:current-layer="svg24" />
+  <metadata id="metadata30">
+    <rdf:RDF>
+      <cc:Work rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title></dc:title>
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <g id="g844" transform="translate(0,3.0301033)">
+    <path id="path2" style="fill:#82c91e"
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+  <path
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+  <path d="m 141.5,109.6 h 4.5 v 3 h -4.5 z" fill="#8a9cb3" id="path16" />
+</svg>

briar-android/artwork/transfer_data_receive.svg

@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:cc="http://creativecommons.org/ns#"
+    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://www.w3.org/2000/svg"
+    xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+    xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape" width="120" height="52"
+    viewBox="0 0 120 52" fill="none" version="1.1" id="svg24"
+    sodipodi:docname="transfer_data_receive.svg" inkscape:version="1.0.2 (e86c870879, 2021-01-15)">
+  <defs id="defs11" />
+  <sodipodi:namedview pagecolor="#ffffff" bordercolor="#666666" borderopacity="1"
+      objecttolerance="10" gridtolerance="10" guidetolerance="10" inkscape:pageopacity="0"
+      inkscape:pageshadow="2" inkscape:window-width="1920" inkscape:window-height="982"
+      id="namedview9" showgrid="false" inkscape:zoom="4.1077454" inkscape:cx="81.48675"
+      inkscape:cy="18.42645" inkscape:window-x="1920" inkscape:window-y="72"
+      inkscape:window-maximized="0" inkscape:current-layer="svg24" inkscape:document-rotation="0"
+      fit-margin-top="0" fit-margin-left="0" fit-margin-right="0" fit-margin-bottom="0" />
+  <metadata id="metadata30">
+    <rdf:RDF>
+      <cc:Work rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title></dc:title>
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <path id="path8"
+      style="fill:#8a9cb3;stroke:none;stroke-width:0.749281;stroke-miterlimit:4;stroke-dasharray:none"
+      d="m 15.97512,14.267003 c -0.596207,0 -1.167798,0.237677 -1.588736,0.659365 -0.421693,0.42094 -0.659371,0.992537 -0.659371,1.588743 v 10.111264 c -0.596207,0 -1.16631,0.236178 -1.58725,0.657875 -0.421682,0.420938 -0.659361,0.992529 -0.659361,1.588736 v 12.35937 h 2.246611 v -12.35937 h 17.977398 v 12.359369 h 2.24662 V 28.872986 c 0,-0.596207 -0.23619,-1.167798 -0.65788,-1.588737 -0.42094,-0.421697 -0.99253,-0.657875 -1.58874,-0.657875 V 16.515111 c 0,-0.596206 -0.23768,-1.167804 -0.65937,-1.588743 -0.42094,-0.421688 -0.99252,-0.659365 -1.58873,-0.659365 z m 0,2.248108 H 29.456311 V 26.626375 H 15.97512 Z m 2.24662,2.224241 v 2.246609 h 3.369915 v -2.246609 z m 5.618031,0 v 2.246609 h 3.36993 v -2.246609 z"
+      sodipodi:nodetypes="scsccsccccccsccscssccccccccccccccc" />
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+      id="path895" style="fill:#82c91e;fill-opacity:1;stroke:none;stroke-width:1.53692" />
+  <path id="path8-3"
+      style="fill:#8a9cb3;stroke:none;stroke-width:0.985186;stroke-miterlimit:4;stroke-dasharray:none"
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+</svg>

briar-android/artwork/transfer_data_send.svg

@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:cc="http://creativecommons.org/ns#"
+    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://www.w3.org/2000/svg"
+    xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+    xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape" width="120" height="52"
+    viewBox="0 0 120 52" fill="none" version="1.1" id="svg24"
+    sodipodi:docname="transfer_data_send.svg" inkscape:version="1.0.2 (e86c870879, 2021-01-15)">
+  <defs id="defs11" />
+  <sodipodi:namedview pagecolor="#ffffff" bordercolor="#666666" borderopacity="1"
+      objecttolerance="10" gridtolerance="10" guidetolerance="10" inkscape:pageopacity="0"
+      inkscape:pageshadow="2" inkscape:window-width="1920" inkscape:window-height="982"
+      id="namedview9" showgrid="false" inkscape:zoom="4.1077454" inkscape:cx="35.020218"
+      inkscape:cy="26.319497" inkscape:window-x="1920" inkscape:window-y="72"
+      inkscape:window-maximized="1" inkscape:current-layer="svg24" inkscape:document-rotation="0"
+      fit-margin-top="0" fit-margin-left="0" fit-margin-right="0" fit-margin-bottom="0"
+      lock-margins="true" />
+  <metadata id="metadata30">
+    <rdf:RDF>
+      <cc:Work rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title></dc:title>
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <path id="path8"
+      style="fill:#8a9cb3;stroke:none;stroke-width:0.749281;stroke-miterlimit:4;stroke-dasharray:none"
+      d="m 91.223138,12.30985 c -0.596207,0 -1.167798,0.237677 -1.588736,0.659365 -0.421693,0.42094 -0.659371,0.992537 -0.659371,1.588743 v 10.111264 c -0.596207,0 -1.16631,0.236178 -1.58725,0.657875 -0.421682,0.420938 -0.659361,0.992529 -0.659361,1.588736 v 12.35937 h 2.246611 v -12.35937 h 17.977399 v 12.359369 h 2.24662 V 26.915833 c 0,-0.596207 -0.23619,-1.167798 -0.65788,-1.588737 -0.42094,-0.421697 -0.99253,-0.657875 -1.58874,-0.657875 V 14.557958 c 0,-0.596206 -0.23768,-1.167804 -0.65937,-1.588743 -0.42094,-0.421688 -0.99252,-0.659365 -1.58873,-0.659365 z m 0,2.248108 H 104.70433 V 24.669222 H 91.223138 Z m 2.24662,2.224241 v 2.246609 h 3.369915 v -2.246609 z m 5.618031,0 v 2.246609 h 3.369931 v -2.246609 z"
+      sodipodi:nodetypes="scsccsccccccsccscssccccccccccccccc" />
+  <path
+      d="m 47.827564,24.463076 v 3.073847 h 18.443085 l -8.45308,8.453081 2.182432,2.182432 12.172435,-12.172438 -12.172435,-12.172434 -2.182432,2.182431 8.45308,8.45308 z"
+      id="path895" style="fill:#82c91e;fill-opacity:1;stroke:none;stroke-width:1.53692" />
+  <path id="path8-3"
+      style="fill:#8a9cb3;stroke:none;stroke-width:0.985186;stroke-miterlimit:4;stroke-dasharray:none"
+      d="M 6.4982841,0 C 4.7744519,0 3.1234817,0.68560936 1.9045686,1.9045677 0.68565358,3.1235212 0,4.7763832 0,6.5002454 V 45.497793 c 0,1.723832 0.68565358,3.378724 1.9045686,4.597639 C 3.1234817,51.314343 4.7744519,52 6.4982841,52 H 25.999019 c 1.723832,0 3.376764,-0.685657 4.595677,-1.904568 1.218914,-1.218917 1.904569,-2.873807 1.904568,-4.597639 V 6.5002454 c 0,-1.7238622 -0.685654,-3.3767242 -1.904568,-4.5956777 C 29.375783,0.68560936 27.722851,0 25.999019,0 Z m 0,3.2520847 H 25.999019 c 0.861916,0 1.689313,0.339865 2.29882,0.9493418 0.609407,0.6094767 0.951302,1.4368929 0.951302,2.2988189 V 45.497793 c 0,0.861916 -0.341895,1.689315 -0.951302,2.29882 -0.609507,0.609408 -1.436904,0.953264 -2.29882,0.953264 H 6.4982841 c -0.8619161,0 -1.6873525,-0.343856 -2.2968577,-0.953264 C 3.5920186,47.187108 3.2501219,46.359709 3.2501219,45.497793 V 6.5002454 c 0,-0.861926 0.3418967,-1.6893422 0.9513045,-2.2988189 C 4.8109316,3.5919497 5.636368,3.2520847 6.4982841,3.2520847 Z M 16.248652,36.016144 c -0.861916,0 -1.68745,0.341895 -2.296859,0.951302 -0.609506,0.609506 -0.953264,1.436905 -0.953264,2.29882 0,0.861916 0.343758,1.687452 0.953264,2.29686 0.609409,0.609507 1.434943,0.951302 2.296859,0.951302 0.861916,0 1.689312,-0.341797 2.298819,-0.951302 0.609408,-0.609408 0.951303,-1.434942 0.951303,-2.29686 0,-0.861915 -0.341895,-1.689311 -0.951303,-2.29882 -0.609507,-0.609407 -1.436903,-0.951302 -2.298819,-0.951302 z"
+      sodipodi:nodetypes="sssssssscsssssscsscsscsscsssscssscs" />
+</svg>

briar-android/build.gradle

@@ -26,8 +26,8 @@ android {
 	defaultConfig {
 		minSdkVersion 16
 		targetSdkVersion 30
-		versionCode 10303
-		versionName "1.3.3"
+		versionCode 10305
+		versionName "1.3.5"
 		applicationId "org.briarproject.briar.android"
 
 		vectorDrawables.useSupportLibrary = true
@@ -100,19 +100,19 @@ dependencies {
 	implementation project(path: ':bramble-core', configuration: 'default')
 	implementation project(':bramble-android')
 
-	implementation 'androidx.fragment:fragment:1.3.0'
+	implementation 'androidx.fragment:fragment:1.3.4'
 	implementation 'androidx.preference:preference:1.1.1'
-	implementation 'androidx.exifinterface:exifinterface:1.3.1'
+	implementation 'androidx.exifinterface:exifinterface:1.3.2'
 	implementation 'androidx.lifecycle:lifecycle-extensions:2.2.0'
 	implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
-	implementation 'com.google.android.material:material:1.2.1'
-	implementation 'androidx.recyclerview:recyclerview-selection:1.1.0-rc03'
+	implementation 'com.google.android.material:material:1.3.0'
+	implementation 'androidx.recyclerview:recyclerview-selection:1.1.0'
 
 	implementation 'info.guardianproject.panic:panic:1.0'
 	implementation 'info.guardianproject.trustedintents:trustedintents:0.2'
 	implementation 'de.hdodenhof:circleimageview:3.0.1'
 	implementation 'com.google.zxing:core:3.3.3'  // newer version need minSdk 24
-	implementation 'uk.co.samuelwall:material-tap-target-prompt:3.0.0'
+	implementation 'uk.co.samuelwall:material-tap-target-prompt:3.3.0'
 	implementation 'com.vanniktech:emoji-google:0.6.0' // newer versions need minSdk 21
 	implementation 'com.github.kobakei:MaterialFabSpeedDial:1.2.1'
 	implementation 'com.github.chrisbanes:PhotoView:2.3.0'
@@ -121,28 +121,28 @@ dependencies {
 		exclude group: 'com.android.support'
 		exclude module: 'disklrucache' // when there's no disk cache, we can't accidentally use it
 	}
+	implementation 'org.nanohttpd:nanohttpd:2.3.1'
 
-	annotationProcessor 'com.google.dagger:dagger-compiler:2.24'
+	annotationProcessor "com.google.dagger:dagger-compiler:$dagger_version"
 	annotationProcessor "com.github.bumptech.glide:compiler:$glideVersion"
 
 	compileOnly 'javax.annotation:jsr250-api:1.0'
 
 	def espressoVersion = '3.3.0'
-	def jmockVersion = '2.8.2'
 	testImplementation project(path: ':bramble-api', configuration: 'testOutput')
 	testImplementation project(path: ':bramble-core', configuration: 'testOutput')
 	testImplementation 'androidx.test:runner:1.3.0'
 	testImplementation 'androidx.test.ext:junit:1.1.2'
-	testImplementation 'androidx.fragment:fragment-testing:1.2.5'
+	testImplementation 'androidx.fragment:fragment-testing:1.3.4'
 	testImplementation "androidx.arch.core:core-testing:2.1.0"
 	testImplementation "androidx.test.espresso:espresso-core:$espressoVersion"
 	testImplementation 'org.robolectric:robolectric:4.3.1'
-	testImplementation 'org.mockito:mockito-core:3.1.0'
-	testImplementation 'junit:junit:4.13.1'
-	testImplementation "org.jmock:jmock:$jmockVersion"
-	testImplementation "org.jmock:jmock-junit4:$jmockVersion"
-	testImplementation "org.jmock:jmock-legacy:$jmockVersion"
-	testAnnotationProcessor "com.google.dagger:dagger-compiler:2.24"
+	testImplementation 'org.mockito:mockito-core:3.9.0'
+	testImplementation "junit:junit:$junit_version"
+	testImplementation "org.jmock:jmock:$jmock_version"
+	testImplementation "org.jmock:jmock-junit4:$jmock_version"
+	testImplementation "org.jmock:jmock-legacy:$jmock_version"
+	testAnnotationProcessor "com.google.dagger:dagger-compiler:$dagger_version"
 
 	androidTestImplementation project(path: ':bramble-api', configuration: 'testOutput')
 	androidTestImplementation 'androidx.test.ext:junit:1.1.2'
@@ -151,9 +151,9 @@ dependencies {
 	androidTestImplementation "androidx.test.espresso:espresso-intents:$espressoVersion"
 	androidTestImplementation 'androidx.test:runner:1.3.0'
 	androidTestUtil 'androidx.test:orchestrator:1.3.0'
-	androidTestAnnotationProcessor "com.google.dagger:dagger-compiler:2.24"
+	androidTestAnnotationProcessor "com.google.dagger:dagger-compiler:$dagger_version"
 	androidTestCompileOnly 'javax.annotation:jsr250-api:1.0'
-	androidTestImplementation 'junit:junit:4.13.1'
+	androidTestImplementation "junit:junit:$junit_version"
 	androidTestScreenshotImplementation 'tools.fastlane:screengrab:2.0.0'
 	androidTestScreenshotImplementation 'com.jraska:falcon:2.1.1'
 	androidTestScreenshotImplementation 'androidx.test.uiautomator:uiautomator:2.2.0'

briar-android/src/main/AndroidManifest.xml

@@ -18,6 +18,7 @@
 
 	<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
 	<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
+	<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
 	<uses-permission android:name="android.permission.BLUETOOTH" />
 	<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
 	<uses-permission android:name="android.permission.CAMERA" />
@@ -104,8 +105,7 @@
 
 		<activity
 			android:name="org.briarproject.briar.android.account.SetupActivity"
-			android:label="@string/setup_title"
-			android:windowSoftInputMode="adjustResize|stateAlwaysVisible" />
+			android:label="@string/setup_title" />
 
 		<activity
 			android:name="org.briarproject.briar.android.splash.SplashScreenActivity"
@@ -437,11 +437,25 @@
 				android:value="org.briarproject.briar.android.navdrawer.NavDrawerActivity" />
 		</activity>
 
+		<activity
+			android:name="org.briarproject.briar.android.removabledrive.RemovableDriveActivity"
+			android:label="@string/removable_drive_menu_title"
+			android:parentActivityName="org.briarproject.briar.android.conversation.ConversationActivity">
+			<meta-data
+				android:name="android.support.PARENT_ACTIVITY"
+				android:value="org.briarproject.briar.android.conversation.ConversationActivity" />
+		</activity>
+
 		<activity
 			android:name=".android.contact.add.remote.PendingContactListActivity"
 			android:label="@string/pending_contact_requests"
 			android:theme="@style/BriarTheme" />
 
+		<activity
+			android:name=".android.hotspot.HotspotActivity"
+			android:label="@string/hotspot_title"
+			android:theme="@style/BriarTheme" />
+
 	</application>
 
 	<queries>

briar-android/src/main/assets/hotspot.html

@@ -0,0 +1,103 @@
+<html>
+<head>
+    <meta content="text/html;charset=utf-8" http-equiv="Content-Type">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <style>
+        body {
+            background-color: #F2F2F2;
+            font-family: Roboto,Arial,Helvetica,sans-serif;
+            font-size: 14px;
+            margin: 0;
+            height: 100%;
+        }
+        div#top {
+            background-color: #FFFFFF;
+            padding: 16px;
+        }
+        div#bottom {
+            padding: 16px 32px;
+            margin-top: 12px;
+        }
+        a.button {
+            background-color: #82C91E;
+            width: 100%;
+            display: block;
+            box-sizing: border-box;
+            padding: 12px 32px !important;
+            border: 1px solid transparent;
+            border-radius: 2px;
+            color: #000000 !important;
+            cursor: pointer;
+            font-weight: 500;
+            text-decoration: none;
+            text-transform: uppercase;
+            text-align: center;
+            margin: 20px auto 20px auto;
+        }
+        ol {
+            list-style: none;
+            counter-reset: briar-counter;
+            padding-left: 40px;
+        }
+        ol li {
+            counter-increment: briar-counter;
+            margin-bottom: 2em;
+        }
+        ol li::before {
+            content: counter(briar-counter);
+            background-color: #82C91E;
+            color: #000000 !important;
+            font-weight: bold;
+            border-radius: 70px;
+            width: 24px;
+            height: 24px;
+            line-height: 24px;
+            text-align: center;
+            position: absolute;
+            left: 32px;
+        }
+
+    </style>
+</head>
+<body>
+
+<div id="top">
+    <svg style="width:156px;height:47px;" viewBox="0 0 778 235">
+        <path style="fill:#87c214"
+              d="m 64.900391,0 c -9.7,0 -17.701172,7.9992183 -17.701172,17.699219 v 22.5 h 43.601562 v -22.5 C 90.800781,7.9992183 82.899219,0 73.199219,0 Z m 96.999999,0 c -9.7,0 -17.70117,7.9992183 -17.70117,17.699219 V 137.19922 h 43.60156 V 17.699219 C 187.80078,7.9992183 179.89922,0 170.19922,0 Z M 47.199219,97.800781 V 217.30078 c 0,9.7 7.901172,17.69922 17.701172,17.69922 h 8.298828 c 9.7,0 17.701172,-7.99922 17.701172,-17.69922 V 97.800781 Z m 97.000001,96.999999 v 22.5 c 0,9.7 8.00117,17.69922 17.70117,17.69922 h 8.29883 c 9.7,0 17.70117,-7.99922 17.70117,-17.69922 v -22.5 z"/>
+        <path style="fill:#95d220"
+              d="M 17.699219,47.199219 C 7.9992186,47.199219 0,55.100391 0,64.900391 v 8.298828 c 0,9.7 7.8992186,17.701172 17.699219,17.701172 H 137.19922 V 47.199219 Z m 177.101561,0 v 43.701172 h 22.5 c 9.7,0 17.69922,-7.901172 17.69922,-17.701172 v -8.298828 c 0,-9.8 -7.99922,-17.701172 -17.69922,-17.701172 z M 17.699219,144.19922 C 7.9992186,144.19922 0,152.10039 0,161.90039 v 8.29883 c 0,9.7 7.8992186,17.70117 17.699219,17.70117 h 22.5 v -43.70117 z m 80.101562,0 v 43.70117 H 217.30078 c 9.7,0 17.69922,-8.00117 17.69922,-17.70117 v -8.29883 c 0,-9.8 -7.99922,-17.70117 -17.69922,-17.70117 z"/>
+        <path d="M 301,60.564864 V 174.43514 h 53.31362 c 25.13729,0 38.31622,-12.58548 38.31622,-32.27441 0,-12.78766 -5.88,-22.32687 -17.63776,-27.60431 v -0.20217 c 8.91968,-5.48043 12.77339,-12.38249 12.77339,-23.140374 0,-16.238294 -11.14945,-30.648991 -34.66495,-30.648991 z m 110.68683,0 V 174.43514 h 13.37598 v -45.67022 l -1.41529,-1.41926 h 26.95811 c 15.00127,0 23.51842,5.27428 28.99185,17.04704 l 14.1887,30.04244 h 15.00139 l -16.82503,-35.52128 c -3.64896,-7.91617 -9.52848,-12.99064 -14.79921,-15.22341 v -0.20216 c 12.36593,-3.24765 22.70429,-14.41228 22.70429,-29.229734 0,-22.530633 -17.43208,-33.693671 -38.31224,-33.693671 z m 111.08726,0 V 174.43514 h 13.37992 V 60.564864 Z m 78.65821,0 -50.07469,113.870276 h 14.59701 l 12.16287,-27.40213 -0.60656,-1.41926 h 62.2336 l -0.60655,1.41926 12.16286,27.40213 h 14.59701 L 615.62098,60.564864 Z m 79.463,0 V 174.43514 h 13.37994 v -45.67022 l -1.41927,-1.41926 h 26.96209 c 15.00128,0 23.51842,5.27428 28.99185,17.04704 l 14.1887,30.04244 H 778 l -16.82503,-35.52128 c -3.64895,-7.91617 -9.52851,-12.99064 -14.79921,-15.22341 v -0.20216 c 12.36591,-3.24765 22.70427,-14.41228 22.70427,-29.229734 0,-22.530633 -17.43209,-33.693671 -38.31223,-33.693671 z M 312.96068,73.147961 h 38.72057 c 14.59584,0 22.29593,5.887175 22.29593,18.065895 0,10.148944 -6.07834,18.268094 -22.29593,18.268094 h -38.72057 l 1.41927,-1.41927 V 74.571187 Z m 110.68684,0 h 37.90786 c 13.78495,0 24.32519,5.684988 24.52791,20.908395 0,12.178724 -9.52687,20.702244 -25.94718,20.702244 h -36.48859 l 1.41529,-1.41927 V 74.571187 Z m 269.00626,0 h 37.90788 c 13.98769,0 24.53187,5.684988 24.53187,20.908395 0,12.178724 -9.52688,20.702244 -25.94718,20.702244 h -36.49257 l 1.41927,-1.41927 V 74.571187 Z m -83.92693,1.423226 h 0.20615 l 3.44509,11.366019 20.06794,45.670224 1.41924,1.41926 h -50.07071 l 1.41926,-1.41926 20.06793,-45.670224 z M 312.96068,122.06505 h 41.35294 c 16.82575,0 24.53189,7.71398 24.53189,20.09568 0,12.58468 -7.09797,19.69131 -24.53189,19.69131 h -41.35294 l 1.41927,-1.42322 v -36.94055 z"/>
+    </svg>
+
+    <h2 id="download_title">Download Briar 1.2.20</h2>
+
+    <span id="download_intro">Someone nearby shared Briar with you.</span>
+
+    <a href="/app.apk" class="button">
+        <svg aria-hidden="true"
+             style="width:24px;height:24px;margin-right:6px;vertical-align:middle;"
+             viewBox="0 0 24 24">
+            <path fill="currentColor" d="M5,20H19V18H5M19,9H15V3H9V9H5L12,16L19,9Z"/>
+        </svg>
+        <span id="download_button">Download Briar</span>
+    </a>
+
+    <span id="download_outro">After the download is complete, open the downloaded file and install it.</span>
+</div>
+
+<div id="bottom">
+    <h3 id="troubleshooting_title">Troubleshooting</h3>
+    <ol>
+        <li id="troubleshooting_1">If you can't download the app, try it with a different web
+            browser app.
+        </li>
+        <li id="troubleshooting_2">Ensure that your browser is allowed to download apps directly by
+            giving it the permission or enabling the installation of apps from "Unknown Sources" in
+            system settings.
+        </li>
+    </ol>
+</div>
+
+</body>
+</html>

briar-android/src/main/java/org/briarproject/briar/android/AndroidComponent.java

@@ -36,8 +36,16 @@ import org.briarproject.briar.BriarCoreModule;
 import org.briarproject.briar.android.attachment.AttachmentModule;
 import org.briarproject.briar.android.attachment.media.MediaModule;
 import org.briarproject.briar.android.conversation.glide.BriarModelLoader;
+import org.briarproject.briar.android.hotspot.AbstractTabsFragment;
+import org.briarproject.briar.android.hotspot.FallbackFragment;
+import org.briarproject.briar.android.hotspot.HotspotIntroFragment;
+import org.briarproject.briar.android.hotspot.ManualHotspotFragment;
+import org.briarproject.briar.android.hotspot.QrHotspotFragment;
 import org.briarproject.briar.android.logging.CachingLogHandler;
 import org.briarproject.briar.android.login.SignInReminderReceiver;
+import org.briarproject.briar.android.removabledrive.ChooserFragment;
+import org.briarproject.briar.android.removabledrive.ReceiveFragment;
+import org.briarproject.briar.android.removabledrive.SendFragment;
 import org.briarproject.briar.android.settings.ConnectionsFragment;
 import org.briarproject.briar.android.settings.NotificationsFragment;
 import org.briarproject.briar.android.settings.SecurityFragment;
@@ -212,4 +220,20 @@ public interface AndroidComponent
 	void inject(SecurityFragment securityFragment);
 
 	void inject(NotificationsFragment notificationsFragment);
+
+	void inject(HotspotIntroFragment hotspotIntroFragment);
+
+	void inject(AbstractTabsFragment abstractTabsFragment);
+
+	void inject(QrHotspotFragment qrHotspotFragment);
+
+	void inject(ManualHotspotFragment manualHotspotFragment);
+
+	void inject(FallbackFragment fallbackFragment);
+
+	void inject(ChooserFragment chooserFragment);
+
+	void inject(SendFragment sendFragment);
+
+	void inject(ReceiveFragment receiveFragment);
 }

briar-android/src/main/java/org/briarproject/briar/android/AndroidNotificationManagerImpl.java

@@ -30,6 +30,7 @@ import org.briarproject.bramble.util.StringUtils;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.conversation.ConversationActivity;
 import org.briarproject.briar.android.forum.ForumActivity;
+import org.briarproject.briar.android.hotspot.HotspotActivity;
 import org.briarproject.briar.android.login.SignInReminderReceiver;
 import org.briarproject.briar.android.navdrawer.NavDrawerActivity;
 import org.briarproject.briar.android.privategroup.conversation.GroupActivity;
@@ -63,9 +64,11 @@ import static android.app.Notification.DEFAULT_SOUND;
 import static android.app.Notification.DEFAULT_VIBRATE;
 import static android.app.NotificationManager.IMPORTANCE_DEFAULT;
 import static android.app.NotificationManager.IMPORTANCE_LOW;
+import static android.app.PendingIntent.getActivity;
 import static android.content.Context.NOTIFICATION_SERVICE;
 import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TOP;
 import static android.content.Intent.FLAG_ACTIVITY_NEW_TASK;
+import static android.content.Intent.FLAG_ACTIVITY_SINGLE_TOP;
 import static android.os.Build.VERSION.SDK_INT;
 import static androidx.core.app.NotificationCompat.CATEGORY_MESSAGE;
 import static androidx.core.app.NotificationCompat.CATEGORY_SERVICE;
@@ -274,7 +277,7 @@ class AndroidNotificationManagerImpl implements AndroidNotificationManager,
 		b.setWhen(0); // Don't show the time
 		b.setOngoing(true);
 		Intent i = new Intent(appContext, SplashScreenActivity.class);
-		b.setContentIntent(PendingIntent.getActivity(appContext, 0, i, 0));
+		b.setContentIntent(getActivity(appContext, 0, i, 0));
 		if (SDK_INT >= 21) {
 			b.setCategory(CATEGORY_SERVICE);
 			b.setVisibility(VISIBILITY_SECRET);
@@ -619,13 +622,11 @@ class AndroidNotificationManagerImpl implements AndroidNotificationManager,
 	public void showSignInNotification() {
 		if (blockSignInReminder) return;
 		if (SDK_INT >= 26) {
-			NotificationChannel channel =
-					new NotificationChannel(REMINDER_CHANNEL_ID, appContext
-							.getString(
-									R.string.reminder_notification_channel_title),
-							IMPORTANCE_LOW);
-			channel.setLockscreenVisibility(
-					NotificationCompat.VISIBILITY_SECRET);
+			NotificationChannel channel = new NotificationChannel(
+					REMINDER_CHANNEL_ID, appContext
+					.getString(R.string.reminder_notification_channel_title),
+					IMPORTANCE_LOW);
+			channel.setLockscreenVisibility(VISIBILITY_SECRET);
 			notificationManager.createNotificationChannel(channel);
 		}
 
@@ -652,7 +653,7 @@ class AndroidNotificationManagerImpl implements AndroidNotificationManager,
 
 		Intent i = new Intent(appContext, SplashScreenActivity.class);
 		i.setFlags(FLAG_ACTIVITY_NEW_TASK | FLAG_ACTIVITY_CLEAR_TOP);
-		b.setContentIntent(PendingIntent.getActivity(appContext, 0, i, 0));
+		b.setContentIntent(getActivity(appContext, 0, i, 0));
 
 		notificationManager.notify(REMINDER_NOTIFICATION_ID, b.build());
 	}
@@ -720,4 +721,40 @@ class AndroidNotificationManagerImpl implements AndroidNotificationManager,
 	public void unblockAllBlogPostNotifications() {
 		androidExecutor.runOnUiThread((Runnable) () -> blockBlogs = false);
 	}
+
+	@Override
+	public void showHotspotNotification() {
+		if (SDK_INT >= 26) {
+			String channelTitle = appContext
+					.getString(R.string.hotspot_notification_channel_title);
+			NotificationChannel channel = new NotificationChannel(
+					HOTSPOT_CHANNEL_ID, channelTitle, IMPORTANCE_LOW);
+			channel.setLockscreenVisibility(VISIBILITY_SECRET);
+			notificationManager.createNotificationChannel(channel);
+		}
+		BriarNotificationBuilder b =
+				new BriarNotificationBuilder(appContext, HOTSPOT_CHANNEL_ID);
+		b.setSmallIcon(R.drawable.notification_hotspot);
+		b.setColorRes(R.color.briar_brand_green);
+		b.setContentTitle(
+				appContext.getText(R.string.hotspot_notification_title));
+		b.setNotificationCategory(CATEGORY_SERVICE);
+		b.setOngoing(true);
+		b.setShowWhen(true);
+
+		String actionTitle =
+				appContext.getString(R.string.hotspot_button_stop_sharing);
+		Intent i = new Intent(appContext, HotspotActivity.class);
+		i.addFlags(FLAG_ACTIVITY_SINGLE_TOP);
+		i.setAction(ACTION_STOP_HOTSPOT);
+		PendingIntent actionIntent = getActivity(appContext, 0, i, 0);
+		int icon = SDK_INT >= 21 ? R.drawable.ic_portable_wifi_off : 0;
+		b.addAction(icon, actionTitle, actionIntent);
+		notificationManager.notify(HOTSPOT_NOTIFICATION_ID, b.build());
+	}
+
+	@Override
+	public void clearHotspotNotification() {
+		notificationManager.cancel(HOTSPOT_NOTIFICATION_ID);
+	}
 }

briar-android/src/main/java/org/briarproject/briar/android/AppModule.java

@@ -25,7 +25,6 @@ import org.briarproject.bramble.api.plugin.simplex.SimplexPluginFactory;
 import org.briarproject.bramble.api.reporting.DevConfig;
 import org.briarproject.bramble.plugin.bluetooth.AndroidBluetoothPluginFactory;
 import org.briarproject.bramble.plugin.file.AndroidRemovableDrivePluginFactory;
-import org.briarproject.bramble.plugin.file.RemovableDriveModule;
 import org.briarproject.bramble.plugin.tcp.AndroidLanTcpPluginFactory;
 import org.briarproject.bramble.plugin.tor.AndroidTorPluginFactory;
 import org.briarproject.bramble.util.AndroidUtils;
@@ -37,12 +36,14 @@ import org.briarproject.briar.android.blog.BlogModule;
 import org.briarproject.briar.android.contact.ContactListModule;
 import org.briarproject.briar.android.contact.add.nearby.AddNearbyContactModule;
 import org.briarproject.briar.android.forum.ForumModule;
+import org.briarproject.briar.android.hotspot.HotspotModule;
 import org.briarproject.briar.android.introduction.IntroductionModule;
 import org.briarproject.briar.android.logging.LoggingModule;
 import org.briarproject.briar.android.login.LoginModule;
 import org.briarproject.briar.android.navdrawer.NavDrawerModule;
 import org.briarproject.briar.android.privategroup.conversation.GroupConversationModule;
 import org.briarproject.briar.android.privategroup.list.GroupListModule;
+import org.briarproject.briar.android.removabledrive.TransferDataModule;
 import org.briarproject.briar.android.reporting.DevReportModule;
 import org.briarproject.briar.android.settings.SettingsModule;
 import org.briarproject.briar.android.sharing.SharingModule;
@@ -69,6 +70,7 @@ import dagger.Provides;
 import static android.content.Context.MODE_PRIVATE;
 import static android.os.Build.VERSION.SDK_INT;
 import static java.util.Arrays.asList;
+import static java.util.Collections.emptyList;
 import static java.util.Collections.singletonList;
 import static java.util.Collections.singletonMap;
 import static org.briarproject.bramble.api.reporting.ReportingConstants.DEV_ONION_ADDRESS;
@@ -93,7 +95,8 @@ import static org.briarproject.briar.android.TestingConstants.IS_DEBUG_BUILD;
 		GroupListModule.class,
 		GroupConversationModule.class,
 		SharingModule.class,
-		RemovableDriveModule.class
+		HotspotModule.class,
+		TransferDataModule.class,
 })
 public class AppModule {
 
@@ -165,7 +168,7 @@ public class AppModule {
 
 			@Override
 			public Collection<SimplexPluginFactory> getSimplexFactories() {
-				return singletonList(drive);
+				return SDK_INT >= 19 ? singletonList(drive) : emptyList();
 			}
 
 			@Override
@@ -307,6 +310,16 @@ public class AppModule {
 			public boolean shouldEnableConnectViaBluetooth() {
 				return IS_DEBUG_BUILD;
 			}
+
+			@Override
+			public boolean shouldEnableTransferData() {
+				return IS_DEBUG_BUILD;
+			}
+
+			@Override
+			public boolean shouldEnableShareAppViaOfflineHotspot() {
+				return IS_DEBUG_BUILD;
+			}
 		};
 	}
 }

briar-android/src/main/java/org/briarproject/briar/android/StartupFailureActivity.java

@@ -51,26 +51,27 @@ public class StartupFailureActivity extends BaseActivity implements
 		}
 
 		// show proper error message
-		String errorMsg;
+		int errorRes;
 		switch (result) {
+			case CLOCK_ERROR:
+				errorRes = R.string.startup_failed_clock_error;
+				break;
 			case DATA_TOO_OLD_ERROR:
-				errorMsg =
-						getString(R.string.startup_failed_data_too_old_error);
+				errorRes = R.string.startup_failed_data_too_old_error;
 				break;
 			case DATA_TOO_NEW_ERROR:
-				errorMsg =
-						getString(R.string.startup_failed_data_too_new_error);
+				errorRes = R.string.startup_failed_data_too_new_error;
 				break;
 			case DB_ERROR:
-				errorMsg = getString(R.string.startup_failed_db_error);
+				errorRes = R.string.startup_failed_db_error;
 				break;
 			case SERVICE_ERROR:
-				errorMsg = getString(R.string.startup_failed_service_error);
+				errorRes = R.string.startup_failed_service_error;
 				break;
 			default:
 				throw new IllegalArgumentException();
 		}
-		showInitialFragment(ErrorFragment.newInstance(errorMsg));
+		showInitialFragment(ErrorFragment.newInstance(getString(errorRes)));
 	}
 
 	@Override