WIP: Add border to message bubbles on Android 4.

This gets rid of all those pesky 9-Patch drawables

.gitlab-ci.yml

@@ -1,11 +1,6 @@
 image: briar/ci-image-android:latest
 
-stages:
-- test
-- check_reproducibility
-
 test:
-  stage: test
   before_script:
     - set -e
     - export GRADLE_USER_HOME=$PWD/.gradle
@@ -16,8 +11,8 @@ test:
       - .gradle/caches
 
   script:
-    - ./gradlew --no-daemon -Djava.security.egd=file:/dev/urandom animalSnifferMain animalSnifferTest
+    - ./gradlew --no-daemon animalSnifferMain animalSnifferTest
-    - ./gradlew --no-daemon -Djava.security.egd=file:/dev/urandom check compileOfficialDebugAndroidTestSources compileScreenshotDebugAndroidTestSources
+    - ./gradlew --no-daemon test
 
   after_script:
     # these file change every time but should not be cached
@@ -26,7 +21,6 @@ test:
 
 
 test_reproducible:
-  stage: check_reproducibility
   script:
     - "curl -X POST -F token=${RELEASE_CHECK_TOKEN} -F ref=master -F variables[RELEASE_TAG]=${CI_COMMIT_REF_NAME} https://code.briarproject.org/api/v4/projects/61/trigger/pipeline"
   only:

.idea/codeStyles/Project.xml

@@ -1,10 +1,16 @@
 <component name="ProjectCodeStyleConfiguration">
   <code_scheme name="Project" version="173">
+    <option name="RIGHT_MARGIN" value="100" />
     <AndroidXmlCodeStyleSettings>
-      <option name="ARRANGEMENT_SETTINGS_MIGRATED_TO_191" value="true" />
+      <option name="USE_CUSTOM_SETTINGS" value="true" />
     </AndroidXmlCodeStyleSettings>
     <JavaCodeStyleSettings>
       <option name="ANNOTATION_PARAMETER_WRAP" value="1" />
+      <option name="CLASS_COUNT_TO_USE_IMPORT_ON_DEMAND" value="99" />
+      <option name="NAMES_COUNT_TO_USE_IMPORT_ON_DEMAND" value="99" />
+      <option name="PACKAGES_TO_USE_IMPORT_ON_DEMAND">
+        <value />
+      </option>
       <option name="IMPORT_LAYOUT_TABLE">
         <value>
           <package name="android" withSubpackages="true" static="false" />
@@ -30,9 +36,31 @@
       <option name="JD_ALIGN_PARAM_COMMENTS" value="false" />
       <option name="JD_ALIGN_EXCEPTION_COMMENTS" value="false" />
     </JavaCodeStyleSettings>
-    <JetCodeStyleSettings>
+    <Objective-C-extensions>
-      <option name="CODE_STYLE_DEFAULTS" value="KOTLIN_OFFICIAL" />
+      <file>
-    </JetCodeStyleSettings>
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Import" />
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Macro" />
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Typedef" />
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Enum" />
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Constant" />
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Global" />
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Struct" />
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="FunctionPredecl" />
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Function" />
+      </file>
+      <class>
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Property" />
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Synthesize" />
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="InitMethod" />
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="StaticMethod" />
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="InstanceMethod" />
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="DeallocMethod" />
+      </class>
+      <extensions>
+        <pair source="cpp" header="h" fileNamingConvention="NONE" />
+        <pair source="c" header="h" fileNamingConvention="NONE" />
+      </extensions>
+    </Objective-C-extensions>
     <XML>
       <option name="XML_LEGACY_SETTINGS_IMPORTED" value="true" />
     </XML>
@@ -71,6 +99,7 @@
       </indentOptions>
     </codeStyleSettings>
     <codeStyleSettings language="XML">
+      <option name="FORCE_REARRANGE_MODE" value="1" />
       <indentOptions>
         <option name="CONTINUATION_INDENT_SIZE" value="4" />
         <option name="USE_TAB_CHARACTER" value="true" />
@@ -83,8 +112,7 @@
               <match>
                 <AND>
                   <NAME>xmlns:android</NAME>
-                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>Namespace:</XML_NAMESPACE>
-                  <XML_NAMESPACE>^$</XML_NAMESPACE>
                 </AND>
               </match>
             </rule>
@@ -94,8 +122,7 @@
               <match>
                 <AND>
                   <NAME>xmlns:.*</NAME>
-                  <XML_ATTRIBUTE />
+                  <XML_NAMESPACE>Namespace:</XML_NAMESPACE>
-                  <XML_NAMESPACE>^$</XML_NAMESPACE>
                 </AND>
               </match>
               <order>BY_NAME</order>
@@ -106,7 +133,6 @@
               <match>
                 <AND>
                   <NAME>.*:id</NAME>
-                  <XML_ATTRIBUTE />
                   <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
                 </AND>
               </match>
@@ -117,7 +143,6 @@
               <match>
                 <AND>
                   <NAME>.*:name</NAME>
-                  <XML_ATTRIBUTE />
                   <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
                 </AND>
               </match>
@@ -128,7 +153,6 @@
               <match>
                 <AND>
                   <NAME>name</NAME>
-                  <XML_ATTRIBUTE />
                   <XML_NAMESPACE>^$</XML_NAMESPACE>
                 </AND>
               </match>
@@ -139,7 +163,6 @@
               <match>
                 <AND>
                   <NAME>style</NAME>
-                  <XML_ATTRIBUTE />
                   <XML_NAMESPACE>^$</XML_NAMESPACE>
                 </AND>
               </match>
@@ -150,7 +173,6 @@
               <match>
                 <AND>
                   <NAME>.*</NAME>
-                  <XML_ATTRIBUTE />
                   <XML_NAMESPACE>^$</XML_NAMESPACE>
                 </AND>
               </match>
@@ -161,12 +183,64 @@
             <rule>
               <match>
                 <AND>
-                  <NAME>.*</NAME>
+                  <NAME>.*:layout_width</NAME>
-                  <XML_ATTRIBUTE />
                   <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
                 </AND>
               </match>
-              <order>ANDROID_ATTRIBUTE_ORDER</order>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*:layout_height</NAME>
+                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*:layout_.*</NAME>
+                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>BY_NAME</order>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*:width</NAME>
+                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>BY_NAME</order>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*:height</NAME>
+                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>BY_NAME</order>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*</NAME>
+                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>BY_NAME</order>
             </rule>
           </section>
           <section>
@@ -174,7 +248,6 @@
               <match>
                 <AND>
                   <NAME>.*</NAME>
-                  <XML_ATTRIBUTE />
                   <XML_NAMESPACE>.*</XML_NAMESPACE>
                 </AND>
               </match>
@@ -184,11 +257,5 @@
         </rules>
       </arrangement>
     </codeStyleSettings>
-    <codeStyleSettings language="kotlin">
-      <option name="CODE_STYLE_DEFAULTS" value="KOTLIN_OFFICIAL" />
-      <option name="PARAMETER_ANNOTATION_WRAP" value="1" />
-      <option name="VARIABLE_ANNOTATION_WRAP" value="1" />
-      <option name="ENUM_CONSTANTS_WRAP" value="1" />
-    </codeStyleSettings>
   </code_scheme>
 </component>

.idea/runConfigurations/All_tests.xml

@@ -1,20 +1,29 @@
 <component name="ProjectRunConfigurationManager">
   <configuration default="false" name="All tests" type="AndroidJUnit" factoryName="Android JUnit">
+    <extension name="coverage" enabled="false" merge="false" sample_coverage="true" runner="idea" />
     <module name="briar-android" />
+    <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
+    <option name="ALTERNATIVE_JRE_PATH" />
     <option name="PACKAGE_NAME" value="" />
     <option name="MAIN_CLASS_NAME" value="" />
     <option name="METHOD_NAME" value="" />
     <option name="TEST_OBJECT" value="package" />
+    <option name="VM_PARAMETERS" value="-ea" />
     <option name="PARAMETERS" value="" />
-    <option name="WORKING_DIRECTORY" value="$PROJECT_DIR$/briar-android" />
+    <option name="WORKING_DIRECTORY" value="file://$PROJECT_DIR$/briar-android" />
-    <method v="2">
+    <option name="ENV_VARIABLES" />
-      <option name="Android.Gradle.BeforeRunTask" enabled="true" />
+    <option name="PASS_PARENT_ENVS" value="true" />
+    <option name="TEST_SEARCH_SCOPE">
+      <value defaultName="singleModule" />
+    </option>
+    <envs />
+    <patterns />
+    <method>
       <option name="RunConfigurationTask" enabled="true" run_configuration_name="All tests in bramble-api" run_configuration_type="AndroidJUnit" />
       <option name="RunConfigurationTask" enabled="true" run_configuration_name="All tests in bramble-core" run_configuration_type="AndroidJUnit" />
       <option name="RunConfigurationTask" enabled="true" run_configuration_name="All tests in bramble-android" run_configuration_type="AndroidJUnit" />
-      <option name="RunConfigurationTask" enabled="true" run_configuration_name="All tests in bramble-java" run_configuration_type="AndroidJUnit" />
+      <option name="RunConfigurationTask" enabled="true" run_configuration_name="All tests in bramble-j2se" run_configuration_type="AndroidJUnit" />
       <option name="RunConfigurationTask" enabled="true" run_configuration_name="All tests in briar-core" run_configuration_type="AndroidJUnit" />
-      <option name="RunConfigurationTask" enabled="true" run_configuration_name="All tests in briar-headless" run_configuration_type="AndroidJUnit" />
     </method>
   </configuration>
 </component>

.idea/runConfigurations/All_tests_in_bramble_android.xml

@@ -1,5 +1,6 @@
 <component name="ProjectRunConfigurationManager">
   <configuration default="false" name="All tests in bramble-android" type="AndroidJUnit" factoryName="Android JUnit">
+    <extension name="coverage" enabled="false" merge="false" sample_coverage="true" runner="idea" />
     <module name="bramble-android" />
     <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
     <option name="ALTERNATIVE_JRE_PATH" />
@@ -10,10 +11,12 @@
     <option name="VM_PARAMETERS" value="-ea" />
     <option name="PARAMETERS" value="" />
     <option name="WORKING_DIRECTORY" value="file://$PROJECT_DIR$/bramble-android" />
+    <option name="ENV_VARIABLES" />
     <option name="PASS_PARENT_ENVS" value="true" />
     <option name="TEST_SEARCH_SCOPE">
       <value defaultName="singleModule" />
     </option>
+    <envs />
     <patterns />
     <method />
   </configuration>

.idea/runConfigurations/All_tests_in_bramble_api.xml

@@ -1,5 +1,6 @@
 <component name="ProjectRunConfigurationManager">
   <configuration default="false" name="All tests in bramble-api" type="AndroidJUnit" factoryName="Android JUnit">
+    <extension name="coverage" enabled="false" merge="false" sample_coverage="true" runner="idea" />
     <module name="bramble-api" />
     <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
     <option name="ALTERNATIVE_JRE_PATH" />
@@ -10,10 +11,12 @@
     <option name="VM_PARAMETERS" value="-ea" />
     <option name="PARAMETERS" value="" />
     <option name="WORKING_DIRECTORY" value="file://$PROJECT_DIR$/bramble-api" />
+    <option name="ENV_VARIABLES" />
     <option name="PASS_PARENT_ENVS" value="true" />
     <option name="TEST_SEARCH_SCOPE">
       <value defaultName="singleModule" />
     </option>
+    <envs />
     <patterns />
     <method />
   </configuration>

.idea/runConfigurations/All_tests_in_bramble_core.xml

@@ -1,5 +1,6 @@
 <component name="ProjectRunConfigurationManager">
   <configuration default="false" name="All tests in bramble-core" type="AndroidJUnit" factoryName="Android JUnit">
+    <extension name="coverage" enabled="false" merge="false" sample_coverage="true" runner="idea" />
     <module name="bramble-core" />
     <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
     <option name="ALTERNATIVE_JRE_PATH" />
@@ -10,10 +11,12 @@
     <option name="VM_PARAMETERS" value="-ea" />
     <option name="PARAMETERS" value="" />
     <option name="WORKING_DIRECTORY" value="file://$PROJECT_DIR$/bramble-core" />
+    <option name="ENV_VARIABLES" />
     <option name="PASS_PARENT_ENVS" value="true" />
     <option name="TEST_SEARCH_SCOPE">
       <value defaultName="singleModule" />
     </option>
+    <envs />
     <patterns />
     <method />
   </configuration>

.idea/runConfigurations/All_tests_in_bramble_j2se.xml

@@ -1,6 +1,7 @@
 <component name="ProjectRunConfigurationManager">
-  <configuration default="false" name="All tests in bramble-java" type="AndroidJUnit" factoryName="Android JUnit">
+  <configuration default="false" name="All tests in bramble-j2se" type="AndroidJUnit" factoryName="Android JUnit">
-    <module name="bramble-java" />
+    <extension name="coverage" enabled="false" merge="false" sample_coverage="true" runner="idea" />
+    <module name="bramble-j2se" />
     <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
     <option name="ALTERNATIVE_JRE_PATH" />
     <option name="PACKAGE_NAME" value="" />
@@ -9,11 +10,13 @@
     <option name="TEST_OBJECT" value="package" />
     <option name="VM_PARAMETERS" value="-ea -Djava.library.path=libs" />
     <option name="PARAMETERS" value="" />
-    <option name="WORKING_DIRECTORY" value="file://$PROJECT_DIR$/bramble-java" />
+    <option name="WORKING_DIRECTORY" value="file://$PROJECT_DIR$/bramble-j2se" />
+    <option name="ENV_VARIABLES" />
     <option name="PASS_PARENT_ENVS" value="true" />
     <option name="TEST_SEARCH_SCOPE">
       <value defaultName="singleModule" />
     </option>
+    <envs />
     <patterns />
     <method />
   </configuration>

.idea/runConfigurations/All_tests_in_briar_android.xml

@@ -1,5 +1,6 @@
 <component name="ProjectRunConfigurationManager">
   <configuration default="false" name="All tests in briar-android" type="AndroidJUnit" factoryName="Android JUnit">
+    <extension name="coverage" enabled="false" merge="false" sample_coverage="true" runner="idea" />
     <module name="briar-android" />
     <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
     <option name="ALTERNATIVE_JRE_PATH" />
@@ -10,10 +11,12 @@
     <option name="VM_PARAMETERS" value="-ea" />
     <option name="PARAMETERS" value="" />
     <option name="WORKING_DIRECTORY" value="file://$PROJECT_DIR$/briar-android" />
+    <option name="ENV_VARIABLES" />
     <option name="PASS_PARENT_ENVS" value="true" />
     <option name="TEST_SEARCH_SCOPE">
       <value defaultName="singleModule" />
     </option>
+    <envs />
     <patterns />
     <method />
   </configuration>

.idea/runConfigurations/All_tests_in_briar_core.xml

@@ -1,5 +1,6 @@
 <component name="ProjectRunConfigurationManager">
   <configuration default="false" name="All tests in briar-core" type="AndroidJUnit" factoryName="Android JUnit">
+    <extension name="coverage" enabled="false" merge="false" sample_coverage="true" runner="idea" />
     <module name="briar-core" />
     <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
     <option name="ALTERNATIVE_JRE_PATH" />
@@ -10,10 +11,12 @@
     <option name="VM_PARAMETERS" value="-ea" />
     <option name="PARAMETERS" value="" />
     <option name="WORKING_DIRECTORY" value="file://$PROJECT_DIR$/briar-core" />
+    <option name="ENV_VARIABLES" />
     <option name="PASS_PARENT_ENVS" value="true" />
     <option name="TEST_SEARCH_SCOPE">
       <value defaultName="singleModule" />
     </option>
+    <envs />
     <patterns />
     <method />
   </configuration>

.idea/runConfigurations/All_tests_in_briar_headless.xml

@@ -1,15 +0,0 @@
-<component name="ProjectRunConfigurationManager">
-  <configuration default="false" name="All tests in briar-headless" type="AndroidJUnit" factoryName="Android JUnit">
-    <module name="briar-headless" />
-    <option name="PACKAGE_NAME" value="org.briarproject.briar.headless" />
-    <option name="MAIN_CLASS_NAME" value="" />
-    <option name="METHOD_NAME" value="" />
-    <option name="TEST_OBJECT" value="package" />
-    <option name="VM_PARAMETERS" />
-    <option name="PARAMETERS" value="" />
-    <option name="WORKING_DIRECTORY" value="$PROJECT_DIR$/briar-headless" />
-    <method v="2">
-      <option name="Android.Gradle.BeforeRunTask" enabled="true" />
-    </method>
-  </configuration>
-</component>

.idea/runConfigurations/H2_Performance_Test.xml

@@ -1,5 +1,6 @@
 <component name="ProjectRunConfigurationManager">
   <configuration default="false" name="H2 Performance Test" type="AndroidJUnit" factoryName="Android JUnit">
+    <extension name="coverage" enabled="false" merge="false" sample_coverage="true" runner="idea" />
     <module name="bramble-core" />
     <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
     <option name="ALTERNATIVE_JRE_PATH" />
@@ -10,10 +11,12 @@
     <option name="VM_PARAMETERS" value="-ea" />
     <option name="PARAMETERS" value="" />
     <option name="WORKING_DIRECTORY" value="" />
+    <option name="ENV_VARIABLES" />
     <option name="PASS_PARENT_ENVS" value="true" />
     <option name="TEST_SEARCH_SCOPE">
       <value defaultName="singleModule" />
     </option>
+    <envs />
     <patterns />
     <method />
   </configuration>

.idea/runConfigurations/HyperSQL_Performance_Test.xml

@@ -1,5 +1,6 @@
 <component name="ProjectRunConfigurationManager">
   <configuration default="false" name="HyperSQL Performance Test" type="AndroidJUnit" factoryName="Android JUnit">
+    <extension name="coverage" enabled="false" merge="false" sample_coverage="true" runner="idea" />
     <module name="bramble-core" />
     <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
     <option name="ALTERNATIVE_JRE_PATH" />
@@ -10,10 +11,12 @@
     <option name="VM_PARAMETERS" value="-ea" />
     <option name="PARAMETERS" value="" />
     <option name="WORKING_DIRECTORY" value="" />
+    <option name="ENV_VARIABLES" />
     <option name="PASS_PARENT_ENVS" value="true" />
     <option name="TEST_SEARCH_SCOPE">
       <value defaultName="singleModule" />
     </option>
+    <envs />
     <patterns />
     <method />
   </configuration>

.idea/runConfigurations/briar_headless.xml

@@ -1,17 +0,0 @@
-<component name="ProjectRunConfigurationManager">
-  <configuration default="false" name="briar-headless" type="JetRunConfigurationType" factoryName="Kotlin" singleton="true">
-    <extension name="coverage" enabled="false" merge="false" sample_coverage="true" runner="idea" />
-    <option name="VM_PARAMETERS" value="" />
-    <option name="PROGRAM_PARAMETERS" value="-v" />
-    <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
-    <option name="ALTERNATIVE_JRE_PATH" />
-    <option name="PASS_PARENT_ENVS" value="true" />
-    <option name="MAIN_CLASS_NAME" value="org.briarproject.briar.headless.MainKt" />
-    <option name="WORKING_DIRECTORY" value="" />
-    <module name="briar-headless" />
-    <envs />
-    <method>
-      <option name="Gradle.BeforeRunTask" enabled="true" tasks="jar" externalProjectPath="$PROJECT_DIR$/briar-headless" vmOptions="" scriptParameters="" />
-    </method>
-  </configuration>
-</component>

bramble-android/build.gradle

@@ -1,35 +1,24 @@
-import com.android.build.gradle.tasks.MergeResources
-
 apply plugin: 'com.android.library'
 apply plugin: 'witness'
-apply from: 'witness.gradle'
 
 android {
-	compileSdkVersion 29
+	compileSdkVersion 27
-	buildToolsVersion '29.0.2'
+	buildToolsVersion '27.0.3'
 
 	defaultConfig {
-		minSdkVersion 16
+		minSdkVersion 14
-		targetSdkVersion 28
+		targetSdkVersion 26
-		versionCode 10207
+		versionCode 10013
-		versionName "1.2.7"
+		versionName "1.0.13"
 		consumerProguardFiles 'proguard-rules.txt'
 
-		testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+		testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
 	}
 
 	compileOptions {
 		sourceCompatibility JavaVersion.VERSION_1_8
 		targetCompatibility JavaVersion.VERSION_1_8
 	}
-
-	lintOptions {
-		// FIXME
-		warning "LintError"
-		warning "InvalidPackage"
-		warning "MissingPermission"
-		warning "InlinedApi", "ObsoleteSdkInt", "Override", "NewApi", "UnusedAttribute"
-	}
 }
 
 configurations {
@@ -38,10 +27,10 @@ configurations {
 
 dependencies {
 	implementation project(path: ':bramble-core', configuration: 'default')
-	tor 'org.briarproject:tor-android:0.3.5.10@zip'
+	implementation 'org.briarproject:jtorctl:0.3'
-	tor 'org.briarproject:obfs4proxy-android:0.0.11-2@zip'
+	tor 'org.briarproject:tor-android:0.2.9.16@zip'
 
-	annotationProcessor 'com.google.dagger:dagger-compiler:2.24'
+	annotationProcessor 'com.google.dagger:dagger-compiler:2.0.2'
 
 	compileOnly 'javax.annotation:jsr250-api:1.0'
 
@@ -50,31 +39,115 @@ dependencies {
 	testImplementation "org.jmock:jmock:2.8.2"
 	testImplementation "org.jmock:jmock-junit4:2.8.2"
 	testImplementation "org.jmock:jmock-legacy:2.8.2"
+	testImplementation "org.hamcrest:hamcrest-library:1.3"
+	testImplementation "org.hamcrest:hamcrest-core:1.3"
+
+	androidTestImplementation project(path: ':bramble-api', configuration: 'testOutput')
+	androidTestImplementation project(path: ':bramble-core', configuration: 'testOutput')
+	androidTestImplementation 'com.android.support.test:runner:1.0.2'
+	androidTestAnnotationProcessor 'com.google.dagger:dagger-compiler:2.0.2'
+	androidTestCompileOnly 'javax.annotation:jsr250-api:1.0'
 }
 
-def torBinariesDir = 'src/main/res/raw'
+dependencyVerification {
+	verify = [
+			'cglib:cglib:3.2.0:cglib-3.2.0.jar:adb13bab79712ad6bdf1bd59f2a3918018a8016e722e8a357065afb9e6690861',
+			'com.android.support.test:monitor:1.0.2:monitor-1.0.2.aar:38ef4fa98a32dc55550ff49bb36a583e178b3a9b830fcb8dcc27bfc4254bc2bc',
+			'com.android.support.test:runner:1.0.2:runner-1.0.2.aar:f04b9ae342975ba1cb3e4a06e13426e3e6b8a73faa45acba604493d83c9a4f00',
+			'com.android.support:support-annotations:27.1.1:support-annotations-27.1.1.jar:3365960206c3d2b09e845f555e7f88f8effc8d2f00b369e66c4be384029299cf',
+			'com.android.tools.analytics-library:protos:26.1.3:protos-26.1.3.jar:818c9f256f141d9dafec03a1aa2b94d240b2c140acfd7ee31a8b3e6c2b9479e3',
+			'com.android.tools.analytics-library:shared:26.1.3:shared-26.1.3.jar:7110706c7ada96c8b6f5ca80c478291bc7899d46277de2c48527e045442401a3',
+			'com.android.tools.analytics-library:tracker:26.1.3:tracker-26.1.3.jar:4155424bf2ce4872da83332579a1707252bc66cbd77c5144fdc4483d0f2e1418',
+			'com.android.tools.build:apksig:3.1.3:apksig-3.1.3.jar:7e1f8e675a6e768e5b56405e41d6c3cc05befe62e601b04177de1029902c9c89',
+			'com.android.tools.build:builder-model:3.1.3:builder-model-3.1.3.jar:06ad1c422d679fc698451479cb40ba863849d67bfd1de23f6d2c16d78b024b0b',
+			'com.android.tools.build:builder-test-api:3.1.3:builder-test-api-3.1.3.jar:4d989f780436794f0f8b2f50e9e079b786571eac90f26c208ab2ae6d4012f389',
+			'com.android.tools.build:builder:3.1.3:builder-3.1.3.jar:8a1092012c89d0ec1ee2eff09c5708c71ef4482a6862df8d3a44a67fccace01c',
+			'com.android.tools.build:gradle-api:3.1.3:gradle-api-3.1.3.jar:01e4df521456aef66514336f1d492346730dd1fb8f6433a89f62da834941ed72',
+			'com.android.tools.build:manifest-merger:26.1.3:manifest-merger-26.1.3.jar:1e4fc7e932adb4607082409800e5e6fccb42e6c5360ae5990094bf522f3ada55',
+			'com.android.tools.ddms:ddmlib:26.1.3:ddmlib-26.1.3.jar:c54931cd68df5d1ea2923b3b320eae47cd2307a5a916bb8674c0acf93cd1d3cd',
+			'com.android.tools.external.com-intellij:intellij-core:26.1.3:intellij-core-26.1.3.jar:af67f5535fef2e1a28b1007a4acb8c5deb6a1e33b8afe7b11d012c9e778ebcec',
+			'com.android.tools.external.com-intellij:kotlin-compiler:26.1.3:kotlin-compiler-26.1.3.jar:c746d2859dc11cc05c84b692b3498d3a621e0929511f8440ee009c6557838fd4',
+			'com.android.tools.external.org-jetbrains:uast:26.1.3:uast-26.1.3.jar:3f3f6651d0c7685a77ecb22e9c82d6b49fdf24322c17360768dc530678f43265',
+			'com.android.tools.layoutlib:layoutlib-api:26.1.3:layoutlib-api-26.1.3.jar:10bc73ce706c45629872d6a999dbe12116df64e24f47ff93b7b13121ff57b4b0',
+			'com.android.tools.lint:lint-api:26.1.3:lint-api-26.1.3.jar:6f97323f9af8deda86278717885b5c927f3766757db89709f52d11d42b6fb751',
+			'com.android.tools.lint:lint-checks:26.1.3:lint-checks-26.1.3.jar:73c3d53784c9ce3e6d5968506581918e0179645d20809927ca4a001dd766b001',
+			'com.android.tools.lint:lint-gradle-api:26.1.3:lint-gradle-api-26.1.3.jar:7ca3c4866ec21dc21d53a9d86f752b77ace6f6c610a0c9dc877313856c733d9d',
+			'com.android.tools.lint:lint-gradle:26.1.3:lint-gradle-26.1.3.jar:db0c354b8f4b6f6637e31f91c564785a59ff896325331fcbc3de7458e0b6c067',
+			'com.android.tools.lint:lint-kotlin:26.1.3:lint-kotlin-26.1.3.jar:94e2b0f4565a241561cfb8fc1222bb3f132a3b98d2a90421dbb72ee8358e7d68',
+			'com.android.tools.lint:lint:26.1.3:lint-26.1.3.jar:8d5f32c989c6d191d712e90ad3ca2d1c409313599551d04d834caa44d26c78df',
+			'com.android.tools:annotations:26.1.3:annotations-26.1.3.jar:c950430b24ac5d58fc97e7283b8f0115f99587e76e08b4e1e2aaa780f2d77323',
+			'com.android.tools:common:26.1.3:common-26.1.3.jar:7c31a90581a148ab219f615a59667f0dded7fa39b248529784474da3c2274ef2',
+			'com.android.tools:dvlib:26.1.3:dvlib-26.1.3.jar:0cae87906f53d3f1088366a916ed180a7312b6d9919b90797f238875c8492855',
+			'com.android.tools:repository:26.1.3:repository-26.1.3.jar:52d4539cc68db91b261e2a33b2c8206b26e05539078758dc28cfb3854adb4f59',
+			'com.android.tools:sdk-common:26.1.3:sdk-common-26.1.3.jar:1948603ca9ff22c7ebb3178000bffa3a9dd2ca1cc5cb0c793cae08468b8fcfc1',
+			'com.android.tools:sdklib:26.1.3:sdklib-26.1.3.jar:4adcfaad9514607098d2c51503c39811112d3050f4d1e744c01c7f08f591032b',
+			'com.google.code.findbugs:jsr305:1.3.9:jsr305-1.3.9.jar:905721a0eea90a81534abb7ee6ef4ea2e5e645fa1def0a5cd88402df1b46c9ed',
+			'com.google.code.gson:gson:2.7:gson-2.7.jar:2d43eb5ea9e133d2ee2405cc14f5ee08951b8361302fdd93494a3a997b508d32',
+			'com.google.dagger:dagger-compiler:2.0.2:dagger-compiler-2.0.2.jar:b74bc9de063dd4c6400b232231f2ef5056145b8fbecbf5382012007dd1c071b3',
+			'com.google.dagger:dagger-producers:2.0-beta:dagger-producers-2.0-beta.jar:99ec15e8a0507ba569e7655bc1165ee5e5ca5aa914b3c8f7e2c2458f724edd6b',
+			'com.google.dagger:dagger:2.0.2:dagger-2.0.2.jar:84c0282ed8be73a29e0475d639da030b55dee72369e58dd35ae7d4fe6243dcf9',
+			'com.google.errorprone:error_prone_annotations:2.0.18:error_prone_annotations-2.0.18.jar:cb4cfad870bf563a07199f3ebea5763f0dec440fcda0b318640b1feaa788656b',
+			'com.google.guava:guava:18.0:guava-18.0.jar:d664fbfc03d2e5ce9cab2a44fb01f1d0bf9dfebeccc1a473b1f9ea31f79f6f99',
+			'com.google.guava:guava:22.0:guava-22.0.jar:1158e94c7de4da480873f0b4ab4a1da14c0d23d4b1902cc94a58a6f0f9ab579e',
+			'com.google.j2objc:j2objc-annotations:1.1:j2objc-annotations-1.1.jar:40ceb7157feb263949e0f503fe5f71689333a621021aa20ce0d0acee3badaa0f',
+			'com.google.jimfs:jimfs:1.1:jimfs-1.1.jar:c4828e28d7c0a930af9387510b3bada7daa5c04d7c25a75c7b8b081f1c257ddd',
+			'com.google.protobuf:protobuf-java:3.4.0:protobuf-java-3.4.0.jar:dce7e66b32456a1b1198da0caff3a8acb71548658391e798c79369241e6490a4',
+			'com.googlecode.json-simple:json-simple:1.1:json-simple-1.1.jar:2d9484f4c649f708f47f9a479465fc729770ee65617dca3011836602264f6439',
+			'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:2.21:istack-commons-runtime-2.21.jar:c33e67a0807095f02a0e2da139412dd7c4f9cc1a4c054b3e434f96831ba950f4',
+			'com.sun.xml.fastinfoset:FastInfoset:1.2.13:FastInfoset-1.2.13.jar:27a77db909f3c2833c0b1a37c55af1db06045118ad2eed96ce567b6632bce038',
+			'commons-codec:commons-codec:1.6:commons-codec-1.6.jar:54b34e941b8e1414bd3e40d736efd3481772dc26db3296f6aa45cec9f6203d86',
+			'commons-logging:commons-logging:1.1.1:commons-logging-1.1.1.jar:ce6f913cad1f0db3aad70186d65c5bc7ffcc9a99e3fe8e0b137312819f7c362f',
+			'it.unimi.dsi:fastutil:7.2.0:fastutil-7.2.0.jar:74fa208043740642f7e6eb09faba15965218ad2f50ce3020efb100136e4b591c',
+			'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:2.2.12-b140109.1041:jaxb-api-2.2.12-b140109.1041.jar:b5e60cd8b7b5ff01ce4a74c5dd008f4fbd14ced3495d0b47b85cfedc182211f2',
+			'junit:junit:4.12:junit-4.12.jar:59721f0805e223d84b90677887d9ff567dc534d7c502ca903c0c2b17f05c116a',
+			'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.commons:commons-compress:1.12:commons-compress-1.12.jar:2c1542faf343185b7cab9c3d55c8ae5471d6d095d3887a4adefdbdf2984dc0b6',
+			'org.apache.httpcomponents:httpclient:4.2.6:httpclient-4.2.6.jar:362e9324ee7c697e21279e20077b52737ddef3f1b2c1a7abe5ad34b465145550',
+			'org.apache.httpcomponents:httpcore:4.2.5:httpcore-4.2.5.jar:e5e82da4cc66c8d917bbf743e3c0752efe8522735e7fc9dbddb65bccea81cfe9',
+			'org.apache.httpcomponents:httpmime:4.1:httpmime-4.1.jar:31629566148e8a47688ae43b420abc3ecd783ed15b33bebc00824bf24c9b15aa',
+			'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:jtorctl:0.3:jtorctl-0.3.jar:f2939238a097898998432effe93b0334d97a787972ab3a91a8973a1d309fc864',
+			'org.briarproject:tor-android:0.2.9.16:tor-android-0.2.9.16.zip:515e33dda6a30853c885a2de2c79ae1ab9ad8b6db44f5db8890333ec2e24f4ae',
+			'org.codehaus.groovy:groovy-all:2.4.12:groovy-all-2.4.12.jar:6a56af4bd48903d56bec62821876cadefafd007360cc6bd0d8f7aa8d72b38be4',
+			'org.codehaus.mojo:animal-sniffer-annotations:1.14:animal-sniffer-annotations-1.14.jar:2068320bd6bad744c3673ab048f67e30bef8f518996fa380033556600669905d',
+			'org.glassfish.jaxb:jaxb-core:2.2.11:jaxb-core-2.2.11.jar:37bcaee8ebb04362c8352a5bf6221b86967ecdab5164c696b10b9a2bb587b2aa',
+			'org.glassfish.jaxb:jaxb-runtime:2.2.11:jaxb-runtime-2.2.11.jar:a874f2351cfba8e2946be3002d10c18a6da8f21b52ba2acf52f2b85d5520ed70',
+			'org.glassfish.jaxb:txw2:2.2.11:txw2-2.2.11.jar:272a3ccad45a4511351920cd2a8633c53cab8d5220c7a92954da5526bb5eafea',
+			'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.jetbrains.kotlin:kotlin-reflect:1.2.0:kotlin-reflect-1.2.0.jar:4f48a872bad6e4d9c053f4ad610d11e4012ad7e58dc19a03dd5eb811f36069dd',
+			'org.jetbrains.kotlin:kotlin-stdlib-jre7:1.2.0:kotlin-stdlib-jre7-1.2.0.jar:c7a20fb951d437797afe8980aff6c1e5a03f310c661ba58ba1d4fa90cb0f2926',
+			'org.jetbrains.kotlin:kotlin-stdlib-jre8:1.2.0:kotlin-stdlib-jre8-1.2.0.jar:633524eee6ef1941f7cb1dab7ee3927b0a221ceee9047aeb5515f4cbb990c82a',
+			'org.jetbrains.kotlin:kotlin-stdlib:1.2.0:kotlin-stdlib-1.2.0.jar:05cfd9f5ac0b41910703a8925f7211a495909b27a2ffdd1c5106f1689aeafcd4',
+			'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.jvnet.staxex:stax-ex:1.7.7:stax-ex-1.7.7.jar:a31ff7d77163c0deb09e7fee59ad35ae44c2cee2cc8552a116ccd1583d813fb4',
+			'org.objenesis:objenesis:2.1:objenesis-2.1.jar:c74330cc6b806c804fd37e74487b4fe5d7c2750c5e15fbc6efa13bdee1bdef80',
+			'org.ow2.asm:asm-analysis:5.1:asm-analysis-5.1.jar:a34658f5c5de4b573eef21131cc32cc25f7b66407944f312b28ec2e56abb1fa9',
+			'org.ow2.asm:asm-commons:5.1:asm-commons-5.1.jar:97b3786e1f55e74bddf8ad102bf50e33bbcbc1f6b7fd7b36f0bbbb25cd4981be',
+			'org.ow2.asm:asm-tree:5.1:asm-tree-5.1.jar:c0de2bbc4cb8297419659813ecd4ed1d077ed1dd5c1f5544cc5143e493e84c10',
+			'org.ow2.asm:asm-util:5.1:asm-util-5.1.jar:ee032c39ae5e3cd099148fbba9a2124f9ed613e5cb93e03ee0fa8808ce364040',
+			'org.ow2.asm:asm:5.0.4:asm-5.0.4.jar:896618ed8ae62702521a78bc7be42b7c491a08e6920a15f89a3ecdec31e9a220',
+			'org.ow2.asm:asm:5.1:asm-5.1.jar:d2da399a9967c69f0a21739256fa79d284222c223082cacadc17372244764b54',
+	]
+}
 
-task cleanTorBinaries {
+project.afterEvaluate {
-	doLast {
+	copy {
-		delete fileTree(torBinariesDir) { include '*.zip' }
+		from configurations.tor.collect { zipTree(it) }
+		into 'src/main/res/raw'
 	}
 }
-
-clean.dependsOn cleanTorBinaries
-
-task unpackTorBinaries {
-	doLast {
-		copy {
-			from configurations.tor.collect { zipTree(it) }
-			into torBinariesDir
-			// TODO: Remove after next Tor upgrade, which won't include non-PIE binaries
-			include 'geoip.zip', '*_pie.zip'
-		}
-	}
-	dependsOn cleanTorBinaries
-}
-
-tasks.withType(MergeResources) {
-	inputs.dir torBinariesDir
-	dependsOn unpackTorBinaries
-}

bramble-android/src/androidTest/java/org/briarproject/bramble/plugin/tor/BridgeTest.java

@@ -0,0 +1,129 @@
+package org.briarproject.bramble.plugin.tor;
+
+import android.content.Context;
+import android.support.test.runner.AndroidJUnit4;
+
+import org.briarproject.bramble.api.event.EventBus;
+import org.briarproject.bramble.api.network.NetworkManager;
+import org.briarproject.bramble.api.plugin.BackoffFactory;
+import org.briarproject.bramble.api.plugin.duplex.DuplexPlugin;
+import org.briarproject.bramble.api.system.Clock;
+import org.briarproject.bramble.api.system.LocationUtils;
+import org.briarproject.bramble.test.BrambleAndroidIntegrationTestComponent;
+import org.briarproject.bramble.test.BrambleTestCase;
+import org.briarproject.bramble.test.DaggerBrambleAndroidIntegrationTestComponent;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import java.util.List;
+import java.util.concurrent.Executor;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.ScheduledThreadPoolExecutor;
+import java.util.logging.Logger;
+
+import javax.inject.Inject;
+import javax.net.SocketFactory;
+
+import static android.support.test.InstrumentationRegistry.getTargetContext;
+import static java.util.Collections.singletonList;
+import static java.util.concurrent.TimeUnit.SECONDS;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+
+
+@RunWith(AndroidJUnit4.class)
+public class BridgeTest extends BrambleTestCase {
+
+	private final static long TIMEOUT = SECONDS.toMillis(23);
+
+	private final static Logger LOG =
+			Logger.getLogger(BridgeTest.class.getSimpleName());
+
+	@Inject
+	NetworkManager networkManager;
+	@Inject
+	EventBus eventBus;
+	@Inject
+	BackoffFactory backoffFactory;
+	@Inject
+	Clock clock;
+
+	private final Context appContext = getTargetContext();
+	private final CircumventionProvider circumventionProvider;
+	private final List<String> bridges;
+	private TorPluginFactory factory;
+	private volatile int currentBridge = 0;
+
+	public BridgeTest() {
+		super();
+		circumventionProvider = new CircumventionProvider() {
+			@Override
+			public boolean isTorProbablyBlocked(String countryCode) {
+				return true;
+			}
+
+			@Override
+			public boolean doBridgesWork(String countryCode) {
+				return true;
+			}
+
+			@Override
+			public List<String> getBridges() {
+				return singletonList(bridges.get(currentBridge));
+			}
+		};
+		bridges = new CircumventionProviderImpl(appContext).getBridges();
+	}
+
+	@Before
+	public void setUp() {
+		BrambleAndroidIntegrationTestComponent component =
+				DaggerBrambleAndroidIntegrationTestComponent.builder().build();
+		component.inject(this);
+
+		Executor ioExecutor = Executors.newCachedThreadPool();
+		ScheduledExecutorService scheduler = new ScheduledThreadPoolExecutor(1);
+		LocationUtils locationUtils = () -> "US";
+		SocketFactory torSocketFactory = SocketFactory.getDefault();
+
+		factory = new TorPluginFactory(ioExecutor, scheduler, appContext,
+				networkManager, locationUtils, eventBus, torSocketFactory,
+				backoffFactory, circumventionProvider, clock);
+	}
+
+	@Test
+	public void testBridges() throws Exception {
+		assertTrue(bridges.size() > 0);
+
+		for (int i = 0; i < bridges.size(); i++) {
+			testBridge(i);
+		}
+	}
+
+	private void testBridge(int bridge) throws Exception {
+		DuplexPlugin duplexPlugin =
+				factory.createPlugin(new TorPluginCallBack());
+		assertNotNull(duplexPlugin);
+		TorPlugin plugin = (TorPlugin) duplexPlugin;
+
+		currentBridge = bridge;
+		LOG.warning("Testing " + bridges.get(currentBridge));
+		try {
+			plugin.start();
+			long start = clock.currentTimeMillis();
+			while (clock.currentTimeMillis() - start < TIMEOUT) {
+				if (plugin.isRunning()) return;
+				clock.sleep(500);
+			}
+			if (!plugin.isRunning()) {
+				fail("Could not connect to Tor within timeout.");
+			}
+		} finally {
+			plugin.stop();
+		}
+	}
+
+}

bramble-android/src/androidTest/java/org/briarproject/bramble/plugin/tor/TorPluginCallBack.java

@@ -1,16 +1,25 @@
 package org.briarproject.bramble.plugin.tor;
 
+import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.plugin.Plugin.State;
+import org.briarproject.bramble.api.plugin.duplex.DuplexPluginCallback;
-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.duplex.DuplexTransportConnection;
 import org.briarproject.bramble.api.properties.TransportProperties;
 import org.briarproject.bramble.api.settings.Settings;
 
 @NotNullByDefault
-public class TestPluginCallback implements PluginCallback {
+public class TorPluginCallBack implements DuplexPluginCallback {
+
+	@Override
+	public void incomingConnectionCreated(DuplexTransportConnection d) {
+
+	}
+
+	@Override
+	public void outgoingConnectionCreated(ContactId c,
+			DuplexTransportConnection d) {
+
+	}
 
 	@Override
 	public Settings getSettings() {
@@ -24,25 +33,22 @@ public class TestPluginCallback implements PluginCallback {
 
 	@Override
 	public void mergeSettings(Settings s) {
+
 	}
 
 	@Override
 	public void mergeLocalProperties(TransportProperties p) {
+
 	}
 
 	@Override
-	public void pluginStateChanged(State state) {
+	public void transportEnabled() {
+
 	}
 
 	@Override
-	public void handleConnection(DuplexTransportConnection c) {
+	public void transportDisabled() {
+
 	}
 
-	@Override
-	public void handleReader(TransportConnectionReader r) {
-	}
-
-	@Override
-	public void handleWriter(TransportConnectionWriter w) {
-	}
 }

bramble-android/src/androidTest/java/org/briarproject/bramble/test/ApplicationModule.java

@@ -0,0 +1,20 @@
+package org.briarproject.bramble.test;
+
+import android.app.Application;
+import android.support.test.InstrumentationRegistry;
+
+import javax.inject.Singleton;
+
+import dagger.Module;
+import dagger.Provides;
+
+@Module
+class ApplicationModule {
+
+	@Provides
+	@Singleton
+	Application provideApplication() {
+		return (Application) InstrumentationRegistry.getTargetContext()
+						.getApplicationContext();
+	}
+}

bramble-android/src/androidTest/java/org/briarproject/bramble/test/BrambleAndroidIntegrationTestComponent.java

@@ -0,0 +1,26 @@
+package org.briarproject.bramble.test;
+
+import org.briarproject.bramble.BrambleAndroidModule;
+import org.briarproject.bramble.event.EventModule;
+import org.briarproject.bramble.plugin.PluginModule;
+import org.briarproject.bramble.plugin.tor.BridgeTest;
+import org.briarproject.bramble.system.SystemModule;
+
+import javax.inject.Singleton;
+
+import dagger.Component;
+
+@Singleton
+@Component(modules = {
+		BrambleAndroidModule.class,
+		TestLifecycleModule.class,
+		ApplicationModule.class,
+		PluginModule.class,  // needed for BackoffFactory
+		EventModule.class,
+		SystemModule.class,
+})
+public interface BrambleAndroidIntegrationTestComponent {
+
+	void inject(BridgeTest init);
+
+}

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

@@ -1,24 +0,0 @@
-package org.briarproject.bramble;
-
-import org.briarproject.bramble.battery.AndroidBatteryModule;
-import org.briarproject.bramble.network.AndroidNetworkModule;
-import org.briarproject.bramble.reporting.ReportingModule;
-
-public interface BrambleAndroidEagerSingletons {
-
-	void inject(AndroidBatteryModule.EagerSingletons init);
-
-	void inject(AndroidNetworkModule.EagerSingletons init);
-
-	void inject(ReportingModule.EagerSingletons init);
-
-	class Helper {
-
-		public static void injectEagerSingletons(
-				BrambleAndroidEagerSingletons c) {
-			c.inject(new AndroidBatteryModule.EagerSingletons());
-			c.inject(new AndroidNetworkModule.EagerSingletons());
-			c.inject(new ReportingModule.EagerSingletons());
-		}
-	}
-}

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

@@ -1,21 +1,27 @@
 package org.briarproject.bramble;
 
-import org.briarproject.bramble.battery.AndroidBatteryModule;
+import android.app.Application;
+
 import org.briarproject.bramble.network.AndroidNetworkModule;
-import org.briarproject.bramble.plugin.tor.CircumventionModule;
+import org.briarproject.bramble.plugin.tor.CircumventionProvider;
-import org.briarproject.bramble.reporting.ReportingModule;
+import org.briarproject.bramble.plugin.tor.CircumventionProviderImpl;
-import org.briarproject.bramble.socks.SocksModule;
 import org.briarproject.bramble.system.AndroidSystemModule;
 
+import javax.inject.Singleton;
+
 import dagger.Module;
+import dagger.Provides;
 
 @Module(includes = {
-		AndroidBatteryModule.class,
 		AndroidNetworkModule.class,
-		AndroidSystemModule.class,
+		AndroidSystemModule.class
-		CircumventionModule.class,
-		ReportingModule.class,
-		SocksModule.class
 })
 public class BrambleAndroidModule {
+
+	@Provides
+	@Singleton
+	CircumventionProvider provideCircumventionProvider(Application app) {
+		return new CircumventionProviderImpl(app.getApplicationContext());
+	}
+
 }

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

@@ -9,34 +9,21 @@ import org.briarproject.bramble.api.account.AccountManager;
 import org.briarproject.bramble.api.crypto.CryptoComponent;
 import org.briarproject.bramble.api.db.DatabaseConfig;
 import org.briarproject.bramble.api.identity.IdentityManager;
+import org.briarproject.bramble.util.IoUtils;
 
 import java.io.File;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Set;
 import java.util.logging.Logger;
 
 import javax.annotation.Nullable;
-import javax.annotation.concurrent.GuardedBy;
 import javax.inject.Inject;
 
-import static android.os.Build.VERSION.SDK_INT;
-import static java.util.Arrays.asList;
-import static java.util.logging.Level.INFO;
-import static org.briarproject.bramble.util.IoUtils.deleteFileOrDir;
-import static org.briarproject.bramble.util.LogUtils.logFileOrDir;
-
 class AndroidAccountManager extends AccountManagerImpl
 		implements AccountManager {
 
 	private static final Logger LOG =
 			Logger.getLogger(AndroidAccountManager.class.getName());
 
-	/**
+	private static final String PREF_DB_KEY = "key";
-	 * Directories that shouldn't be deleted when deleting the user's account.
-	 */
-	private static final List<String> PROTECTED_DIR_NAMES =
-			asList("cache", "code_cache", "lib", "shared_prefs");
 
 	protected final Context appContext;
 	private final SharedPreferences prefs;
@@ -50,30 +37,42 @@ class AndroidAccountManager extends AccountManagerImpl
 		appContext = app.getApplicationContext();
 	}
 
+	// Locking: stateChangeLock
 	@Override
-	public boolean accountExists() {
+	@Nullable
-		boolean exists = super.accountExists();
+	protected String loadEncryptedDatabaseKey() {
-		if (!exists && LOG.isLoggable(INFO)) {
+		String key = getDatabaseKeyFromPreferences();
-			LOG.info("Account does not exist. Contents of account directory:");
+		if (key == null) key = super.loadEncryptedDatabaseKey();
-			logFileOrDir(LOG, INFO, getDataDir());
+		else migrateDatabaseKeyToFile(key);
+		return key;
+	}
+
+	// Locking: stateChangeLock
+	@Nullable
+	private String getDatabaseKeyFromPreferences() {
+		String key = prefs.getString(PREF_DB_KEY, null);
+		if (key == null) LOG.info("No database key in preferences");
+		else LOG.info("Found database key in preferences");
+		return key;
+	}
+
+	// Locking: stateChangeLock
+	private void migrateDatabaseKeyToFile(String key) {
+		if (storeEncryptedDatabaseKey(key)) {
+			if (prefs.edit().remove(PREF_DB_KEY).commit())
+				LOG.info("Database key migrated to file");
+			else LOG.warning("Database key not removed from preferences");
+		} else {
+			LOG.warning("Database key not migrated to file");
 		}
-		return exists;
 	}
 
 	@Override
 	public void deleteAccount() {
 		synchronized (stateChangeLock) {
-			if (LOG.isLoggable(INFO)) {
-				LOG.info("Contents of account directory before deleting:");
-				logFileOrDir(LOG, INFO, getDataDir());
-			}
 			super.deleteAccount();
 			SharedPreferences defaultPrefs = getDefaultSharedPreferences();
 			deleteAppData(prefs, defaultPrefs);
-			if (LOG.isLoggable(INFO)) {
-				LOG.info("Contents of account directory after deleting:");
-				logFileOrDir(LOG, INFO, getDataDir());
-			}
 		}
 	}
 
@@ -82,56 +81,28 @@ class AndroidAccountManager extends AccountManagerImpl
 		return PreferenceManager.getDefaultSharedPreferences(appContext);
 	}
 
-	@GuardedBy("stateChangeLock")
+	// Locking: stateChangeLock
 	private void deleteAppData(SharedPreferences... clear) {
 		// Clear and commit shared preferences
 		for (SharedPreferences prefs : clear) {
 			if (!prefs.edit().clear().commit())
 				LOG.warning("Could not clear shared preferences");
 		}
-		// Delete files, except protected directories
+		// Delete files, except lib and shared_prefs directories
-		Set<File> files = new HashSet<>();
+		File dataDir = new File(appContext.getApplicationInfo().dataDir);
-		File dataDir = getDataDir();
+		File[] children = dataDir.listFiles();
-		@Nullable
+		if (children == null) {
-		File[] fileArray = dataDir.listFiles();
-		if (fileArray == null) {
 			LOG.warning("Could not list files in app data dir");
 		} else {
-			for (File file : fileArray) {
+			for (File child : children) {
-				if (!PROTECTED_DIR_NAMES.contains(file.getName())) {
+				String name = child.getName();
-					files.add(file);
+				if (!name.equals("lib") && !name.equals("shared_prefs")) {
+					IoUtils.deleteFileOrDir(child);
 				}
 			}
 		}
-		files.add(appContext.getFilesDir());
+		// Recreate the cache dir as some OpenGL drivers expect it to exist
-		addIfNotNull(files, appContext.getExternalCacheDir());
+		if (!new File(dataDir, "cache").mkdir())
-		if (SDK_INT >= 19) {
+			LOG.warning("Could not recreate cache dir");
-			for (File file : appContext.getExternalCacheDirs()) {
-				addIfNotNull(files, file);
-			}
-		}
-		if (SDK_INT >= 21) {
-			for (File file : appContext.getExternalMediaDirs()) {
-				addIfNotNull(files, file);
-			}
-		}
-		// Clear the cache directory but don't delete it
-		File cacheDir = appContext.getCacheDir();
-		File[] children = cacheDir.listFiles();
-		if (children != null) files.addAll(asList(children));
-		for (File file : files) {
-			if (LOG.isLoggable(INFO)) {
-				LOG.info("Deleting " + file.getAbsolutePath());
-			}
-			deleteFileOrDir(file);
-		}
-	}
-
-	private File getDataDir() {
-		return new File(appContext.getApplicationInfo().dataDir);
-	}
-
-	private void addIfNotNull(Set<File> files, @Nullable File file) {
-		if (file != null) files.add(file);
 	}
 }

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

@@ -1,81 +0,0 @@
-package org.briarproject.bramble.battery;
-
-import android.app.Application;
-import android.content.BroadcastReceiver;
-import android.content.Context;
-import android.content.Intent;
-import android.content.IntentFilter;
-
-import org.briarproject.bramble.api.battery.BatteryManager;
-import org.briarproject.bramble.api.battery.event.BatteryEvent;
-import org.briarproject.bramble.api.event.EventBus;
-import org.briarproject.bramble.api.lifecycle.Service;
-
-import java.util.concurrent.atomic.AtomicBoolean;
-import java.util.logging.Logger;
-
-import javax.inject.Inject;
-
-import static android.content.Intent.ACTION_BATTERY_CHANGED;
-import static android.content.Intent.ACTION_POWER_CONNECTED;
-import static android.content.Intent.ACTION_POWER_DISCONNECTED;
-import static android.os.BatteryManager.EXTRA_PLUGGED;
-import static java.util.logging.Level.INFO;
-import static java.util.logging.Logger.getLogger;
-
-class AndroidBatteryManager implements BatteryManager, Service {
-
-	private static final Logger LOG =
-			getLogger(AndroidBatteryManager.class.getName());
-
-	private final Context appContext;
-	private final EventBus eventBus;
-	private final AtomicBoolean used = new AtomicBoolean(false);
-
-	private volatile BroadcastReceiver batteryReceiver = null;
-
-	@Inject
-	AndroidBatteryManager(Application app, EventBus eventBus) {
-		this.appContext = app.getApplicationContext();
-		this.eventBus = eventBus;
-	}
-
-	@Override
-	public boolean isCharging() {
-		// Get the sticky intent for ACTION_BATTERY_CHANGED
-		IntentFilter filter = new IntentFilter(ACTION_BATTERY_CHANGED);
-		Intent i = appContext.registerReceiver(null, filter);
-		if (i == null) return false;
-		int status = i.getIntExtra(EXTRA_PLUGGED, 0);
-		return status != 0;
-	}
-
-	@Override
-	public void startService() {
-		if (used.getAndSet(true)) throw new IllegalStateException();
-		batteryReceiver = new BatteryReceiver();
-		IntentFilter filter = new IntentFilter();
-		filter.addAction(ACTION_POWER_CONNECTED);
-		filter.addAction(ACTION_POWER_DISCONNECTED);
-		appContext.registerReceiver(batteryReceiver, filter);
-	}
-
-	@Override
-	public void stopService() {
-		if (batteryReceiver != null)
-			appContext.unregisterReceiver(batteryReceiver);
-	}
-
-	private class BatteryReceiver extends BroadcastReceiver {
-
-		@Override
-		public void onReceive(Context ctx, Intent i) {
-			String action = i.getAction();
-			if (LOG.isLoggable(INFO)) LOG.info("Received broadcast " + action);
-			if (ACTION_POWER_CONNECTED.equals(action))
-				eventBus.broadcast(new BatteryEvent(true));
-			else if (ACTION_POWER_DISCONNECTED.equals(action))
-				eventBus.broadcast(new BatteryEvent(false));
-		}
-	}
-}

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

@@ -1,27 +0,0 @@
-package org.briarproject.bramble.battery;
-
-import org.briarproject.bramble.api.battery.BatteryManager;
-import org.briarproject.bramble.api.lifecycle.LifecycleManager;
-
-import javax.inject.Inject;
-import javax.inject.Singleton;
-
-import dagger.Module;
-import dagger.Provides;
-
-@Module
-public class AndroidBatteryModule {
-
-	public static class EagerSingletons {
-		@Inject
-		BatteryManager batteryManager;
-	}
-
-	@Provides
-	@Singleton
-	BatteryManager provideBatteryManager(LifecycleManager lifecycleManager,
-			AndroidBatteryManager batteryManager) {
-		lifecycleManager.registerService(batteryManager);
-		return batteryManager;
-	}
-}

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

@@ -32,7 +32,6 @@ import static android.content.Intent.ACTION_SCREEN_OFF;
 import static android.content.Intent.ACTION_SCREEN_ON;
 import static android.net.ConnectivityManager.CONNECTIVITY_ACTION;
 import static android.net.ConnectivityManager.TYPE_WIFI;
-import static android.net.wifi.p2p.WifiP2pManager.WIFI_P2P_THIS_DEVICE_CHANGED_ACTION;
 import static android.os.Build.VERSION.SDK_INT;
 import static android.os.PowerManager.ACTION_DEVICE_IDLE_MODE_CHANGED;
 import static java.util.concurrent.TimeUnit.MINUTES;
@@ -77,9 +76,9 @@ class AndroidNetworkManager implements NetworkManager, Service {
 		filter.addAction(ACTION_SCREEN_ON);
 		filter.addAction(ACTION_SCREEN_OFF);
 		filter.addAction(WIFI_AP_STATE_CHANGED_ACTION);
-		filter.addAction(WIFI_P2P_THIS_DEVICE_CHANGED_ACTION);
 		if (SDK_INT >= 23) filter.addAction(ACTION_DEVICE_IDLE_MODE_CHANGED);
 		appContext.registerReceiver(networkStateReceiver, filter);
+
 	}
 
 	@Override
@@ -92,7 +91,7 @@ class AndroidNetworkManager implements NetworkManager, Service {
 	public NetworkStatus getNetworkStatus() {
 		ConnectivityManager cm = (ConnectivityManager)
 				appContext.getSystemService(CONNECTIVITY_SERVICE);
-		if (cm == null) throw new AssertionError();
+		assert cm != null;
 		NetworkInfo net = cm.getActiveNetworkInfo();
 		boolean connected = net != null && net.isConnected();
 		boolean wifi = connected && net.getType() == TYPE_WIFI;
@@ -137,8 +136,7 @@ class AndroidNetworkManager implements NetworkManager, Service {
 		}
 
 		private boolean isApEvent(@Nullable String action) {
-			return WIFI_AP_STATE_CHANGED_ACTION.equals(action) ||
+			return WIFI_AP_STATE_CHANGED_ACTION.equals(action);
-					WIFI_P2P_THIS_DEVICE_CHANGED_ACTION.equals(action);
 		}
 	}
 }

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

@@ -3,7 +3,6 @@ package org.briarproject.bramble.network;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager;
 import org.briarproject.bramble.api.network.NetworkManager;
 
-import javax.inject.Inject;
 import javax.inject.Singleton;
 
 import dagger.Module;
@@ -12,11 +11,6 @@ import dagger.Provides;
 @Module
 public class AndroidNetworkModule {
 
-	public static class EagerSingletons {
-		@Inject
-		NetworkManager networkManager;
-	}
-
 	@Provides
 	@Singleton
 	NetworkManager provideNetworkManager(LifecycleManager lifecycleManager,

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

@@ -9,34 +9,25 @@ import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
 
-import org.briarproject.bramble.api.io.TimeoutMonitor;
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
-import org.briarproject.bramble.api.plugin.PluginCallback;
+import org.briarproject.bramble.api.plugin.Backoff;
 import org.briarproject.bramble.api.plugin.PluginException;
+import org.briarproject.bramble.api.plugin.duplex.DuplexPluginCallback;
 import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
 import org.briarproject.bramble.api.system.AndroidExecutor;
-import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.bramble.util.AndroidUtils;
-import org.briarproject.bramble.util.IoUtils;
 
+import java.io.Closeable;
 import java.io.IOException;
 import java.security.SecureRandom;
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.List;
 import java.util.UUID;
-import java.util.concurrent.BlockingQueue;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.Executor;
-import java.util.concurrent.LinkedBlockingQueue;
-import java.util.concurrent.ScheduledExecutorService;
 import java.util.logging.Logger;
 
 import javax.annotation.Nullable;
 
-import static android.bluetooth.BluetoothAdapter.ACTION_DISCOVERY_FINISHED;
-import static android.bluetooth.BluetoothAdapter.ACTION_DISCOVERY_STARTED;
 import static android.bluetooth.BluetoothAdapter.ACTION_SCAN_MODE_CHANGED;
 import static android.bluetooth.BluetoothAdapter.ACTION_STATE_CHANGED;
 import static android.bluetooth.BluetoothAdapter.EXTRA_SCAN_MODE;
@@ -46,30 +37,18 @@ import static android.bluetooth.BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERA
 import static android.bluetooth.BluetoothAdapter.SCAN_MODE_NONE;
 import static android.bluetooth.BluetoothAdapter.STATE_OFF;
 import static android.bluetooth.BluetoothAdapter.STATE_ON;
-import static android.bluetooth.BluetoothDevice.ACTION_FOUND;
-import static android.bluetooth.BluetoothDevice.DEVICE_TYPE_LE;
-import static android.bluetooth.BluetoothDevice.EXTRA_DEVICE;
-import static android.os.Build.VERSION.SDK_INT;
-import static java.util.Collections.shuffle;
-import static java.util.concurrent.TimeUnit.MILLISECONDS;
-import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
-import static java.util.logging.Logger.getLogger;
+import static org.briarproject.bramble.util.LogUtils.logException;
-import static org.briarproject.bramble.util.PrivacyUtils.scrubMacAddress;
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
 class AndroidBluetoothPlugin extends BluetoothPlugin<BluetoothServerSocket> {
 
 	private static final Logger LOG =
-			getLogger(AndroidBluetoothPlugin.class.getName());
+			Logger.getLogger(AndroidBluetoothPlugin.class.getName());
 
-	private static final int MAX_DISCOVERY_MS = 10_000;
-
-	private final ScheduledExecutorService scheduler;
 	private final AndroidExecutor androidExecutor;
 	private final Context appContext;
-	private final Clock clock;
 
 	private volatile boolean wasEnabledByUs = false;
 	private volatile BluetoothStateReceiver receiver = null;
@@ -78,17 +57,13 @@ class AndroidBluetoothPlugin extends BluetoothPlugin<BluetoothServerSocket> {
 	private volatile BluetoothAdapter adapter = null;
 
 	AndroidBluetoothPlugin(BluetoothConnectionLimiter connectionLimiter,
-			TimeoutMonitor timeoutMonitor, Executor ioExecutor,
+			Executor ioExecutor, AndroidExecutor androidExecutor,
-			SecureRandom secureRandom, ScheduledExecutorService scheduler,
+			Context appContext, SecureRandom secureRandom, Backoff backoff,
-			AndroidExecutor androidExecutor, Context appContext, Clock clock,
+			DuplexPluginCallback callback, int maxLatency) {
-			PluginCallback callback, int maxLatency, int maxIdleTime,
+		super(connectionLimiter, ioExecutor, secureRandom, backoff, callback,
-			int pollingInterval) {
+				maxLatency);
-		super(connectionLimiter, timeoutMonitor, ioExecutor, secureRandom,
-				callback, maxLatency, maxIdleTime, pollingInterval);
-		this.scheduler = scheduler;
 		this.androidExecutor = androidExecutor;
 		this.appContext = appContext;
-		this.clock = clock;
 	}
 
 	@Override
@@ -153,12 +128,6 @@ class AndroidBluetoothPlugin extends BluetoothPlugin<BluetoothServerSocket> {
 		wasEnabledByUs = true;
 	}
 
-	@Override
-	void onAdapterDisabled() {
-		super.onAdapterDisabled();
-		wasEnabledByUs = false;
-	}
-
 	@Override
 	@Nullable
 	String getBluetoothAddress() {
@@ -174,7 +143,11 @@ class AndroidBluetoothPlugin extends BluetoothPlugin<BluetoothServerSocket> {
 
 	@Override
 	void tryToClose(@Nullable BluetoothServerSocket ss) {
-		IoUtils.tryToClose(ss, LOG, WARNING);
+		try {
+			if (ss != null) ss.close();
+		} catch (IOException e) {
+			logException(LOG, WARNING, e);
+		}
 	}
 
 	@Override
@@ -183,10 +156,9 @@ class AndroidBluetoothPlugin extends BluetoothPlugin<BluetoothServerSocket> {
 		return wrapSocket(ss.accept());
 	}
 
-	private DuplexTransportConnection wrapSocket(BluetoothSocket s)
+	private DuplexTransportConnection wrapSocket(BluetoothSocket s) {
-			throws IOException {
+		return new AndroidBluetoothTransportConnection(this,
-		return new AndroidBluetoothTransportConnection(this, connectionLimiter,
+				connectionLimiter, s);
-				timeoutMonitor, appContext, scheduler, s);
 	}
 
 	@Override
@@ -205,81 +177,17 @@ class AndroidBluetoothPlugin extends BluetoothPlugin<BluetoothServerSocket> {
 			s.connect();
 			return wrapSocket(s);
 		} catch (IOException e) {
-			IoUtils.tryToClose(s, LOG, WARNING);
+			tryToClose(s);
 			throw e;
 		}
 	}
 
-	@Override
+	private void tryToClose(@Nullable Closeable c) {
-	@Nullable
-	DuplexTransportConnection discoverAndConnect(String uuid) {
-		if (adapter == null) return null;
-		for (String address : discoverDevices()) {
-			try {
-				if (LOG.isLoggable(INFO))
-					LOG.info("Connecting to " + scrubMacAddress(address));
-				return connectTo(address, uuid);
-			} catch (IOException e) {
-				if (LOG.isLoggable(INFO)) {
-					LOG.info("Could not connect to "
-							+ scrubMacAddress(address));
-				}
-			}
-		}
-		LOG.info("Could not connect to any devices");
-		return null;
-	}
-
-	private Collection<String> discoverDevices() {
-		List<String> addresses = new ArrayList<>();
-		BlockingQueue<Intent> intents = new LinkedBlockingQueue<>();
-		DiscoveryReceiver receiver = new DiscoveryReceiver(intents);
-		IntentFilter filter = new IntentFilter();
-		filter.addAction(ACTION_DISCOVERY_STARTED);
-		filter.addAction(ACTION_DISCOVERY_FINISHED);
-		filter.addAction(ACTION_FOUND);
-		appContext.registerReceiver(receiver, filter);
 		try {
-			if (adapter.startDiscovery()) {
+			if (c != null) c.close();
-				long now = clock.currentTimeMillis();
+		} catch (IOException e) {
-				long end = now + MAX_DISCOVERY_MS;
+			logException(LOG, WARNING, e);
-				while (now < end) {
-					Intent i = intents.poll(end - now, MILLISECONDS);
-					if (i == null) break;
-					String action = i.getAction();
-					if (ACTION_DISCOVERY_STARTED.equals(action)) {
-						LOG.info("Discovery started");
-					} else if (ACTION_DISCOVERY_FINISHED.equals(action)) {
-						LOG.info("Discovery finished");
-						break;
-					} else if (ACTION_FOUND.equals(action)) {
-						BluetoothDevice d = i.getParcelableExtra(EXTRA_DEVICE);
-						// Ignore Bluetooth LE devices
-						if (SDK_INT < 18 || d.getType() != DEVICE_TYPE_LE) {
-							String address = d.getAddress();
-							if (LOG.isLoggable(INFO))
-								LOG.info("Discovered " +
-										scrubMacAddress(address));
-							if (!addresses.contains(address))
-								addresses.add(address);
-						}
-					}
-					now = clock.currentTimeMillis();
-				}
-			} else {
-				LOG.info("Could not start discovery");
-			}
-		} catch (InterruptedException e) {
-			LOG.info("Interrupted while discovering devices");
-			Thread.currentThread().interrupt();
-		} finally {
-			LOG.info("Cancelling discovery");
-			adapter.cancelDiscovery();
-			appContext.unregisterReceiver(receiver);
 		}
-		// Shuffle the addresses so we don't always try the same one first
-		shuffle(addresses);
-		return addresses;
 	}
 
 	private class BluetoothStateReceiver extends BroadcastReceiver {
@@ -299,18 +207,4 @@ class AndroidBluetoothPlugin extends BluetoothPlugin<BluetoothServerSocket> {
 			}
 		}
 	}
-
-	private static class DiscoveryReceiver extends BroadcastReceiver {
-
-		private final BlockingQueue<Intent> intents;
-
-		private DiscoveryReceiver(BlockingQueue<Intent> intents) {
-			this.intents = intents;
-		}
-
-		@Override
-		public void onReceive(Context ctx, Intent intent) {
-			intents.add(intent);
-		}
-	}
 }

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

@@ -3,55 +3,48 @@ package org.briarproject.bramble.plugin.bluetooth;
 import android.content.Context;
 
 import org.briarproject.bramble.api.event.EventBus;
-import org.briarproject.bramble.api.io.TimeoutMonitor;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.plugin.PluginCallback;
+import org.briarproject.bramble.api.plugin.Backoff;
+import org.briarproject.bramble.api.plugin.BackoffFactory;
 import org.briarproject.bramble.api.plugin.TransportId;
 import org.briarproject.bramble.api.plugin.duplex.DuplexPlugin;
+import org.briarproject.bramble.api.plugin.duplex.DuplexPluginCallback;
 import org.briarproject.bramble.api.plugin.duplex.DuplexPluginFactory;
 import org.briarproject.bramble.api.system.AndroidExecutor;
-import org.briarproject.bramble.api.system.Clock;
 
 import java.security.SecureRandom;
 import java.util.concurrent.Executor;
-import java.util.concurrent.ScheduledExecutorService;
 
 import javax.annotation.concurrent.Immutable;
 
-import static java.util.concurrent.TimeUnit.MINUTES;
-import static java.util.concurrent.TimeUnit.SECONDS;
 import static org.briarproject.bramble.api.plugin.BluetoothConstants.ID;
 
 @Immutable
 @NotNullByDefault
 public class AndroidBluetoothPluginFactory implements DuplexPluginFactory {
 
-	private static final int MAX_LATENCY = (int) SECONDS.toMillis(30);
+	private static final int MAX_LATENCY = 30 * 1000; // 30 seconds
-	private static final int MAX_IDLE_TIME = (int) SECONDS.toMillis(30);
+	private static final int MIN_POLLING_INTERVAL = 60 * 1000; // 1 minute
-	private static final int POLLING_INTERVAL = (int) MINUTES.toMillis(2);
+	private static final int MAX_POLLING_INTERVAL = 10 * 60 * 1000; // 10 mins
+	private static final double BACKOFF_BASE = 1.2;
 
 	private final Executor ioExecutor;
-	private final ScheduledExecutorService scheduler;
 	private final AndroidExecutor androidExecutor;
 	private final Context appContext;
 	private final SecureRandom secureRandom;
 	private final EventBus eventBus;
-	private final Clock clock;
+	private final BackoffFactory backoffFactory;
-	private final TimeoutMonitor timeoutMonitor;
 
 	public AndroidBluetoothPluginFactory(Executor ioExecutor,
-			ScheduledExecutorService scheduler,
 			AndroidExecutor androidExecutor, Context appContext,
-			SecureRandom secureRandom, EventBus eventBus, Clock clock,
+			SecureRandom secureRandom, EventBus eventBus,
-			TimeoutMonitor timeoutMonitor) {
+			BackoffFactory backoffFactory) {
 		this.ioExecutor = ioExecutor;
-		this.scheduler = scheduler;
 		this.androidExecutor = androidExecutor;
 		this.appContext = appContext;
 		this.secureRandom = secureRandom;
 		this.eventBus = eventBus;
-		this.clock = clock;
+		this.backoffFactory = backoffFactory;
-		this.timeoutMonitor = timeoutMonitor;
 	}
 
 	@Override
@@ -65,13 +58,14 @@ public class AndroidBluetoothPluginFactory implements DuplexPluginFactory {
 	}
 
 	@Override
-	public DuplexPlugin createPlugin(PluginCallback callback) {
+	public DuplexPlugin createPlugin(DuplexPluginCallback callback) {
 		BluetoothConnectionLimiter connectionLimiter =
-				new BluetoothConnectionLimiterImpl(eventBus);
+				new BluetoothConnectionLimiterImpl();
+		Backoff backoff = backoffFactory.createBackoff(MIN_POLLING_INTERVAL,
+				MAX_POLLING_INTERVAL, BACKOFF_BASE);
 		AndroidBluetoothPlugin plugin = new AndroidBluetoothPlugin(
-				connectionLimiter, timeoutMonitor, ioExecutor, secureRandom,
+				connectionLimiter, ioExecutor, androidExecutor, appContext,
-				scheduler, androidExecutor, appContext, clock, callback,
+				secureRandom, backoff, callback, MAX_LATENCY);
-				MAX_LATENCY, MAX_IDLE_TIME, POLLING_INTERVAL);
 		eventBus.addListener(plugin);
 		return plugin;
 	}

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

@@ -1,60 +1,33 @@
 package org.briarproject.bramble.plugin.bluetooth;
 
 import android.bluetooth.BluetoothSocket;
-import android.content.Context;
-import android.os.PowerManager;
 
-import org.briarproject.bramble.api.io.TimeoutMonitor;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.Plugin;
 import org.briarproject.bramble.api.plugin.duplex.AbstractDuplexTransportConnection;
-import org.briarproject.bramble.util.RenewableWakeLock;
 
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
-import java.util.concurrent.ScheduledExecutorService;
-
-import static android.content.Context.POWER_SERVICE;
-import static android.os.PowerManager.PARTIAL_WAKE_LOCK;
-import static java.util.concurrent.TimeUnit.MINUTES;
-import static org.briarproject.bramble.api.nullsafety.NullSafety.requireNonNull;
-import static org.briarproject.bramble.api.plugin.BluetoothConstants.PROP_ADDRESS;
-import static org.briarproject.bramble.util.AndroidUtils.getWakeLockTag;
-import static org.briarproject.bramble.util.AndroidUtils.isValidBluetoothAddress;
 
 @NotNullByDefault
 class AndroidBluetoothTransportConnection
 		extends AbstractDuplexTransportConnection {
 
-	private final BluetoothConnectionLimiter connectionLimiter;
+	private final BluetoothConnectionLimiter connectionManager;
-	private final RenewableWakeLock wakeLock;
 	private final BluetoothSocket socket;
-	private final InputStream in;
 
 	AndroidBluetoothTransportConnection(Plugin plugin,
-			BluetoothConnectionLimiter connectionLimiter,
+			BluetoothConnectionLimiter connectionManager,
-			TimeoutMonitor timeoutMonitor, Context appContext,
+			BluetoothSocket socket) {
-			ScheduledExecutorService scheduler, BluetoothSocket socket)
-			throws IOException {
 		super(plugin);
-		this.connectionLimiter = connectionLimiter;
+		this.connectionManager = connectionManager;
 		this.socket = socket;
-		in = timeoutMonitor.createTimeoutInputStream(
-				socket.getInputStream(), plugin.getMaxIdleTime() * 2);
-		PowerManager powerManager = (PowerManager)
-				requireNonNull(appContext.getSystemService(POWER_SERVICE));
-		String tag = getWakeLockTag(appContext);
-		wakeLock = new RenewableWakeLock(powerManager, scheduler,
-				PARTIAL_WAKE_LOCK, tag, 1, MINUTES);
-		wakeLock.acquire();
-		String address = socket.getRemoteDevice().getAddress();
-		if (isValidBluetoothAddress(address)) remote.put(PROP_ADDRESS, address);
 	}
 
 	@Override
-	protected InputStream getInputStream() {
+	protected InputStream getInputStream() throws IOException {
-		return in;
+		return socket.getInputStream();
 	}
 
 	@Override
@@ -67,8 +40,7 @@ class AndroidBluetoothTransportConnection
 		try {
 			socket.close();
 		} finally {
-			wakeLock.release();
+			connectionManager.connectionClosed(this);
-			connectionLimiter.connectionClosed(this);
 		}
 	}
 }

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

@@ -1,31 +1,25 @@
 package org.briarproject.bramble.plugin.tcp;
 
-import android.annotation.TargetApi;
 import android.content.Context;
 import android.net.ConnectivityManager;
-import android.net.LinkAddress;
-import android.net.LinkProperties;
 import android.net.Network;
-import android.net.NetworkCapabilities;
+import android.net.NetworkInfo;
 import android.net.wifi.WifiInfo;
 import android.net.wifi.WifiManager;
 
 import org.briarproject.bramble.PoliteExecutor;
-import org.briarproject.bramble.api.Pair;
 import org.briarproject.bramble.api.event.Event;
+import org.briarproject.bramble.api.event.EventListener;
 import org.briarproject.bramble.api.network.event.NetworkStatusEvent;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.plugin.PluginCallback;
+import org.briarproject.bramble.api.plugin.Backoff;
-import org.briarproject.bramble.api.settings.Settings;
+import org.briarproject.bramble.api.plugin.duplex.DuplexPluginCallback;
 
 import java.io.IOException;
 import java.net.InetAddress;
-import java.net.InterfaceAddress;
-import java.net.NetworkInterface;
 import java.net.Socket;
-import java.net.SocketException;
 import java.net.UnknownHostException;
-import java.util.List;
+import java.util.Collection;
 import java.util.concurrent.Executor;
 import java.util.logging.Logger;
 
@@ -34,24 +28,29 @@ import javax.net.SocketFactory;
 
 import static android.content.Context.CONNECTIVITY_SERVICE;
 import static android.content.Context.WIFI_SERVICE;
-import static android.net.NetworkCapabilities.TRANSPORT_WIFI;
+import static android.net.ConnectivityManager.TYPE_WIFI;
 import static android.os.Build.VERSION.SDK_INT;
 import static java.util.Collections.emptyList;
-import static java.util.Collections.list;
 import static java.util.Collections.singletonList;
-import static java.util.logging.Level.WARNING;
-import static java.util.logging.Logger.getLogger;
-import static org.briarproject.bramble.api.plugin.LanTcpConstants.DEFAULT_PREF_PLUGIN_ENABLE;
-import static org.briarproject.bramble.api.plugin.Plugin.State.ACTIVE;
-import static org.briarproject.bramble.api.plugin.Plugin.State.INACTIVE;
-import static org.briarproject.bramble.util.IoUtils.tryToClose;
-import static org.briarproject.bramble.util.LogUtils.logException;
 
 @NotNullByDefault
-class AndroidLanTcpPlugin extends LanTcpPlugin {
+class AndroidLanTcpPlugin extends LanTcpPlugin implements EventListener {
+
+	private static final byte[] WIFI_AP_ADDRESS_BYTES =
+			{(byte) 192, (byte) 168, 43, 1};
+	private static final InetAddress WIFI_AP_ADDRESS;
 
 	private static final Logger LOG =
-			getLogger(AndroidLanTcpPlugin.class.getName());
+			Logger.getLogger(AndroidLanTcpPlugin.class.getName());
+
+	static {
+		try {
+			WIFI_AP_ADDRESS = InetAddress.getByAddress(WIFI_AP_ADDRESS_BYTES);
+		} catch (UnknownHostException e) {
+			// Should only be thrown if the address has an illegal length
+			throw new AssertionError(e);
+		}
+	}
 
 	private final Executor connectionStatusExecutor;
 	private final ConnectivityManager connectivityManager;
@@ -61,16 +60,15 @@ class AndroidLanTcpPlugin extends LanTcpPlugin {
 	private volatile SocketFactory socketFactory;
 
 	AndroidLanTcpPlugin(Executor ioExecutor, Context appContext,
-			PluginCallback callback, int maxLatency, int maxIdleTime,
+			Backoff backoff, DuplexPluginCallback callback, int maxLatency,
-			int pollingInterval, int connectionTimeout) {
+			int maxIdleTime) {
-		super(ioExecutor, callback, maxLatency, maxIdleTime, pollingInterval,
+		super(ioExecutor, backoff, callback, maxLatency, maxIdleTime);
-				connectionTimeout);
 		// Don't execute more than one connection status check at a time
 		connectionStatusExecutor =
 				new PoliteExecutor("AndroidLanTcpPlugin", ioExecutor, 1);
 		ConnectivityManager connectivityManager = (ConnectivityManager)
 				appContext.getSystemService(CONNECTIVITY_SERVICE);
-		if (connectivityManager == null) throw new AssertionError();
+		assert connectivityManager != null;
 		this.connectivityManager = connectivityManager;
 		wifiManager = (WifiManager) appContext.getApplicationContext()
 				.getSystemService(WIFI_SERVICE);
@@ -80,138 +78,34 @@ class AndroidLanTcpPlugin extends LanTcpPlugin {
 	@Override
 	public void start() {
 		if (used.getAndSet(true)) throw new IllegalStateException();
-		initialisePortProperty();
+		running = true;
-		Settings settings = callback.getSettings();
-		state.setStarted(settings.getBoolean(PREF_PLUGIN_ENABLE,
-				DEFAULT_PREF_PLUGIN_ENABLE));
 		updateConnectionStatus();
 	}
 
+	@Override
+	public void stop() {
+		running = false;
+		tryToClose(socket);
+	}
+
 	@Override
 	protected Socket createSocket() throws IOException {
 		return socketFactory.createSocket();
 	}
 
 	@Override
-	protected List<InetAddress> getUsableLocalInetAddresses(boolean ipv4) {
+	protected Collection<InetAddress> getLocalIpAddresses() {
-		InetAddress addr = getWifiAddress(ipv4);
+		// If the device doesn't have wifi, don't open any sockets
-		return addr == null ? emptyList() : singletonList(addr);
+		if (wifiManager == null) return emptyList();
-	}
+		// If we're connected to a wifi network, use that network
-
-	@Nullable
-	private InetAddress getWifiAddress(boolean ipv4) {
-		Pair<InetAddress, Boolean> wifi = getWifiIpv4Address();
-		if (ipv4) return wifi == null ? null : wifi.getFirst();
-		// If there's no wifi IPv4 address, we might be a client on an
-		// IPv6-only wifi network. We can only detect this on API 21+
-		if (wifi == null) {
-			return SDK_INT >= 21 ? getWifiClientIpv6Address() : null;
-		}
-		// Use the wifi IPv4 address to determine which interface's IPv6
-		// address we should return (if the interface has a suitable address)
-		return getIpv6AddressForInterface(wifi.getFirst());
-	}
-
-	/**
-	 * Returns a {@link Pair} where the first element is the IPv4 address of
-	 * the wifi interface and the second element is true if this device is
-	 * providing an access point, or false if this device is a client. Returns
-	 * null if this device isn't connected to wifi as an access point or client.
-	 */
-	@Nullable
-	private Pair<InetAddress, Boolean> getWifiIpv4Address() {
-		if (wifiManager == null) return null;
-		// If we're connected to a wifi network, return its address
 		WifiInfo info = wifiManager.getConnectionInfo();
-		if (info != null && info.getIpAddress() != 0) {
+		if (info != null && info.getIpAddress() != 0)
-			return new Pair<>(intToInetAddress(info.getIpAddress()), false);
+			return singletonList(intToInetAddress(info.getIpAddress()));
-		}
+		// If we're running an access point, return its address
-		List<InterfaceAddress> ifAddrs = getLocalInterfaceAddresses();
+		if (super.getLocalIpAddresses().contains(WIFI_AP_ADDRESS))
-		// If we're providing a normal access point, return its address
+			return singletonList(WIFI_AP_ADDRESS);
-		for (InterfaceAddress ifAddr : ifAddrs) {
+		// No suitable addresses
-			if (isAndroidWifiApAddress(ifAddr)) {
+		return emptyList();
-				return new Pair<>(ifAddr.getAddress(), true);
-			}
-		}
-		// If we're providing a wifi direct access point, return its address
-		for (InterfaceAddress ifAddr : ifAddrs) {
-			if (isAndroidWifiDirectApAddress(ifAddr)) {
-				return new Pair<>(ifAddr.getAddress(), true);
-			}
-		}
-		// Not connected to wifi
-		return null;
-	}
-
-	/**
-	 * Returns true if the given address belongs to a network provided by an
-	 * Android access point (including the access point's own address).
-	 * <p>
-	 * The access point's address is usually 192.168.43.1, but at least one
-	 * device (Honor 8A) may use other addresses in the range 192.168.43.0/24.
-	 */
-	private boolean isAndroidWifiApAddress(InterfaceAddress ifAddr) {
-		if (ifAddr.getNetworkPrefixLength() != 24) return false;
-		byte[] ip = ifAddr.getAddress().getAddress();
-		return ip.length == 4
-				&& ip[0] == (byte) 192
-				&& ip[1] == (byte) 168
-				&& ip[2] == (byte) 43;
-	}
-
-	/**
-	 * Returns true if the given address belongs to a network provided by an
-	 * Android wifi direct legacy mode access point (including the access
-	 * point's own address).
-	 */
-	private boolean isAndroidWifiDirectApAddress(InterfaceAddress ifAddr) {
-		if (ifAddr.getNetworkPrefixLength() != 24) return false;
-		byte[] ip = ifAddr.getAddress().getAddress();
-		return ip.length == 4
-				&& ip[0] == (byte) 192
-				&& ip[1] == (byte) 168
-				&& ip[2] == (byte) 49;
-	}
-
-	/**
-	 * Returns a link-local IPv6 address for the wifi client interface, or null
-	 * if there's no such interface or it doesn't have a suitable address.
-	 */
-	@TargetApi(21)
-	@Nullable
-	private InetAddress getWifiClientIpv6Address() {
-		for (Network net : connectivityManager.getAllNetworks()) {
-			NetworkCapabilities caps =
-					connectivityManager.getNetworkCapabilities(net);
-			if (caps == null || !caps.hasTransport(TRANSPORT_WIFI)) continue;
-			LinkProperties props = connectivityManager.getLinkProperties(net);
-			if (props == null) continue;
-			for (LinkAddress linkAddress : props.getLinkAddresses()) {
-				InetAddress addr = linkAddress.getAddress();
-				if (isIpv6LinkLocalAddress(addr)) return addr;
-			}
-		}
-		return null;
-	}
-
-	/**
-	 * Returns a link-local IPv6 address for the interface with the given IPv4
-	 * address, or null if the interface doesn't have a suitable address.
-	 */
-	@Nullable
-	private InetAddress getIpv6AddressForInterface(InetAddress ipv4) {
-		try {
-			NetworkInterface iface = NetworkInterface.getByInetAddress(ipv4);
-			if (iface == null) return null;
-			for (InetAddress addr : list(iface.getInetAddresses())) {
-				if (isIpv6LinkLocalAddress(addr)) return addr;
-			}
-			// No suitable address
-			return null;
-		} catch (SocketException e) {
-			logException(LOG, WARNING, e);
-			return null;
-		}
 	}
 
 	private InetAddress intToInetAddress(int ip) {
@@ -233,11 +127,9 @@ class AndroidLanTcpPlugin extends LanTcpPlugin {
 	private SocketFactory getSocketFactory() {
 		if (SDK_INT < 21) return SocketFactory.getDefault();
 		for (Network net : connectivityManager.getAllNetworks()) {
-			NetworkCapabilities caps =
+			NetworkInfo info = connectivityManager.getNetworkInfo(net);
-					connectivityManager.getNetworkCapabilities(net);
+			if (info != null && info.getType() == TYPE_WIFI)
-			if (caps != null && caps.hasTransport(TRANSPORT_WIFI)) {
 				return net.getSocketFactory();
-			}
 		}
 		LOG.warning("Could not find suitable socket factory");
 		return SocketFactory.getDefault();
@@ -245,59 +137,30 @@ class AndroidLanTcpPlugin extends LanTcpPlugin {
 
 	@Override
 	public void eventOccurred(Event e) {
-		super.eventOccurred(e);
 		if (e instanceof NetworkStatusEvent) updateConnectionStatus();
 	}
 
 	private void updateConnectionStatus() {
 		connectionStatusExecutor.execute(() -> {
-			State s = getState();
+			if (!running) return;
-			if (s != ACTIVE && s != INACTIVE) return;
+			Collection<InetAddress> addrs = getLocalIpAddresses();
-			Pair<InetAddress, Boolean> wifi = getPreferredWifiAddress();
+			if (addrs.contains(WIFI_AP_ADDRESS)) {
-			if (wifi == null) {
-				LOG.info("Not connected to wifi");
-				socketFactory = SocketFactory.getDefault();
-				// Server sockets may not have been closed automatically when
-				// interface was taken down. If any sockets are open, closing
-				// them here will cause the sockets to be cleared and the state
-				// to be updated in acceptContactConnections()
-				if (s == ACTIVE) {
-					LOG.info("Closing server sockets");
-					tryToClose(state.getServerSocket(true), LOG, WARNING);
-					tryToClose(state.getServerSocket(false), LOG, WARNING);
-				}
-			} else if (wifi.getSecond()) {
 				LOG.info("Providing wifi hotspot");
 				// There's no corresponding Network object and thus no way
 				// to get a suitable socket factory, so we won't be able to
 				// make outgoing connections on API 21+ if another network
 				// has internet access
 				socketFactory = SocketFactory.getDefault();
-				if (s == INACTIVE) bind();
+				if (socket == null || socket.isClosed()) bind();
+			} else if (addrs.isEmpty()) {
+				LOG.info("Not connected to wifi");
+				socketFactory = SocketFactory.getDefault();
+				tryToClose(socket);
 			} else {
 				LOG.info("Connected to wifi");
 				socketFactory = getSocketFactory();
-				if (s == INACTIVE) bind();
+				if (socket == null || socket.isClosed()) bind();
 			}
 		});
 	}
-
-	/**
-	 * Returns a {@link Pair} where the first element is an IP address (IPv4 if
-	 * available, otherwise IPv6) of the wifi interface and the second element
-	 * is true if this device is providing an access point, or false if this
-	 * device is a client. Returns null if this device isn't connected to wifi
-	 * as an access point or client.
-	 */
-	@Nullable
-	private Pair<InetAddress, Boolean> getPreferredWifiAddress() {
-		Pair<InetAddress, Boolean> wifi = getWifiIpv4Address();
-		// If there's no wifi IPv4 address, we might be a client on an
-		// IPv6-only wifi network. We can only detect this on API 21+
-		if (wifi == null && SDK_INT >= 21) {
-			InetAddress ipv6 = getWifiClientIpv6Address();
-			if (ipv6 != null) return new Pair<>(ipv6, false);
-		}
-		return wifi;
-	}
 }

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

@@ -4,36 +4,39 @@ import android.content.Context;
 
 import org.briarproject.bramble.api.event.EventBus;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.plugin.PluginCallback;
+import org.briarproject.bramble.api.plugin.Backoff;
+import org.briarproject.bramble.api.plugin.BackoffFactory;
 import org.briarproject.bramble.api.plugin.TransportId;
 import org.briarproject.bramble.api.plugin.duplex.DuplexPlugin;
+import org.briarproject.bramble.api.plugin.duplex.DuplexPluginCallback;
 import org.briarproject.bramble.api.plugin.duplex.DuplexPluginFactory;
 
 import java.util.concurrent.Executor;
 
 import javax.annotation.concurrent.Immutable;
 
-import static java.util.concurrent.TimeUnit.MINUTES;
-import static java.util.concurrent.TimeUnit.SECONDS;
 import static org.briarproject.bramble.api.plugin.LanTcpConstants.ID;
 
 @Immutable
 @NotNullByDefault
 public class AndroidLanTcpPluginFactory implements DuplexPluginFactory {
 
-	private static final int MAX_LATENCY = (int) SECONDS.toMillis(30);
+	private static final int MAX_LATENCY = 30 * 1000; // 30 seconds
-	private static final int MAX_IDLE_TIME = (int) SECONDS.toMillis(30);
+	private static final int MAX_IDLE_TIME = 30 * 1000; // 30 seconds
-	private static final int POLLING_INTERVAL = (int) MINUTES.toMillis(1);
+	private static final int MIN_POLLING_INTERVAL = 60 * 1000; // 1 minute
-	private static final int CONNECTION_TIMEOUT = (int) SECONDS.toMillis(3);
+	private static final int MAX_POLLING_INTERVAL = 10 * 60 * 1000; // 10 mins
+	private static final double BACKOFF_BASE = 1.2;
 
 	private final Executor ioExecutor;
 	private final EventBus eventBus;
+	private final BackoffFactory backoffFactory;
 	private final Context appContext;
 
 	public AndroidLanTcpPluginFactory(Executor ioExecutor, EventBus eventBus,
-			Context appContext) {
+			BackoffFactory backoffFactory, Context appContext) {
 		this.ioExecutor = ioExecutor;
 		this.eventBus = eventBus;
+		this.backoffFactory = backoffFactory;
 		this.appContext = appContext;
 	}
 
@@ -48,10 +51,11 @@ public class AndroidLanTcpPluginFactory implements DuplexPluginFactory {
 	}
 
 	@Override
-	public DuplexPlugin createPlugin(PluginCallback callback) {
+	public DuplexPlugin createPlugin(DuplexPluginCallback callback) {
+		Backoff backoff = backoffFactory.createBackoff(MIN_POLLING_INTERVAL,
+				MAX_POLLING_INTERVAL, BACKOFF_BASE);
 		AndroidLanTcpPlugin plugin = new AndroidLanTcpPlugin(ioExecutor,
-				appContext, callback, MAX_LATENCY, MAX_IDLE_TIME,
+				appContext, backoff, callback, MAX_LATENCY, MAX_IDLE_TIME);
-				POLLING_INTERVAL, CONNECTION_TIMEOUT);
 		eventBus.addListener(plugin);
 		return plugin;
 	}

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

@@ -1,89 +0,0 @@
-package org.briarproject.bramble.plugin.tor;
-
-import android.content.Context;
-import android.content.pm.PackageInfo;
-import android.content.pm.PackageManager;
-import android.content.pm.PackageManager.NameNotFoundException;
-import android.os.PowerManager;
-
-import org.briarproject.bramble.api.battery.BatteryManager;
-import org.briarproject.bramble.api.network.NetworkManager;
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
-import org.briarproject.bramble.api.plugin.PluginCallback;
-import org.briarproject.bramble.api.system.Clock;
-import org.briarproject.bramble.api.system.LocationUtils;
-import org.briarproject.bramble.api.system.ResourceProvider;
-import org.briarproject.bramble.util.RenewableWakeLock;
-
-import java.io.IOException;
-import java.util.concurrent.Executor;
-import java.util.concurrent.ScheduledExecutorService;
-
-import javax.net.SocketFactory;
-
-import static android.content.Context.MODE_PRIVATE;
-import static android.content.Context.POWER_SERVICE;
-import static android.os.PowerManager.PARTIAL_WAKE_LOCK;
-import static java.util.concurrent.TimeUnit.MINUTES;
-import static org.briarproject.bramble.util.AndroidUtils.getWakeLockTag;
-
-@MethodsNotNullByDefault
-@ParametersNotNullByDefault
-class AndroidTorPlugin extends TorPlugin {
-
-	private final Context appContext;
-	private final RenewableWakeLock wakeLock;
-
-	AndroidTorPlugin(Executor ioExecutor, ScheduledExecutorService scheduler,
-			Context appContext, NetworkManager networkManager,
-			LocationUtils locationUtils, SocketFactory torSocketFactory,
-			Clock clock, ResourceProvider resourceProvider,
-			CircumventionProvider circumventionProvider,
-			BatteryManager batteryManager,
-			TorRendezvousCrypto torRendezvousCrypto,
-			PluginCallback callback, String architecture, int maxLatency,
-			int maxIdleTime, int initialPollingInterval,
-			int stablePollingInterval) {
-		super(ioExecutor, networkManager, locationUtils, torSocketFactory,
-				clock, resourceProvider, circumventionProvider, batteryManager,
-				torRendezvousCrypto, callback, architecture, maxLatency,
-				maxIdleTime, initialPollingInterval, stablePollingInterval,
-				appContext.getDir("tor", MODE_PRIVATE));
-		this.appContext = appContext;
-		PowerManager pm = (PowerManager)
-				appContext.getSystemService(POWER_SERVICE);
-		if (pm == null) throw new AssertionError();
-		wakeLock = new RenewableWakeLock(pm, scheduler, PARTIAL_WAKE_LOCK,
-				getWakeLockTag(appContext), 1, MINUTES);
-	}
-
-	@Override
-	protected int getProcessId() {
-		return android.os.Process.myPid();
-	}
-
-	@Override
-	protected long getLastUpdateTime() {
-		try {
-			PackageManager pm = appContext.getPackageManager();
-			PackageInfo pi = pm.getPackageInfo(appContext.getPackageName(), 0);
-			return pi.lastUpdateTime;
-		} catch (NameNotFoundException e) {
-			throw new AssertionError(e);
-		}
-	}
-
-	@Override
-	protected void enableNetwork(boolean enable) throws IOException {
-		if (enable) wakeLock.acquire();
-		super.enableNetwork(enable);
-		if (!enable) wakeLock.release();
-	}
-
-	@Override
-	public void stop() {
-		super.stop();
-		wakeLock.release();
-	}
-}

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

@@ -17,24 +17,16 @@ public interface CircumventionProvider {
 	String[] BLOCKED = {"CN", "IR", "EG", "BY", "TR", "SY", "VE"};
 
 	/**
-	 * Countries where obfs4 or meek bridge connections are likely to work.
+	 * Countries where vanilla bridge connection are likely to work.
 	 * Should be a subset of {@link #BLOCKED}.
 	 */
-	String[] BRIDGES = { "CN", "IR", "EG", "BY", "TR", "SY", "VE" };
+	String[] BRIDGES = { "EG", "BY", "TR", "SY", "VE" };
-
-	/**
-	 * Countries where obfs4 bridges won't work and meek is needed.
-	 * Should be a subset of {@link #BRIDGES}.
-	 */
-	String[] NEEDS_MEEK = {"CN", "IR"};
 
 	boolean isTorProbablyBlocked(String countryCode);
 
 	boolean doBridgesWork(String countryCode);
 
-	boolean needsMeek(String countryCode);
-
 	@IoExecutor
-	List<String> getBridges(boolean meek);
+	List<String> getBridges();
 
 }

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

@@ -1,9 +1,13 @@
 package org.briarproject.bramble.plugin.tor;
 
+import android.content.Context;
+import android.content.res.Resources;
+
 import org.briarproject.bramble.api.lifecycle.IoExecutor;
 
 import java.io.InputStream;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Scanner;
@@ -12,26 +16,26 @@ import java.util.Set;
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
-import static java.util.Arrays.asList;
+// TODO: Create a module for this so it doesn't need to be public
 
-class CircumventionProviderImpl implements CircumventionProvider {
+public class CircumventionProviderImpl implements CircumventionProvider {
 
 	private final static String BRIDGE_FILE_NAME = "bridges";
 
-	private static final Set<String> BLOCKED_IN_COUNTRIES =
+	private final Context ctx;
-			new HashSet<>(asList(BLOCKED));
-	private static final Set<String> BRIDGES_WORK_IN_COUNTRIES =
-			new HashSet<>(asList(BRIDGES));
-	private static final Set<String> BRIDGES_NEED_MEEK =
-			new HashSet<>(asList(NEEDS_MEEK));
-
 	@Nullable
 	private volatile List<String> bridges = null;
 
 	@Inject
-	CircumventionProviderImpl() {
+	public CircumventionProviderImpl(Context ctx) {
+		this.ctx = ctx;
 	}
 
+	private static final Set<String> BLOCKED_IN_COUNTRIES =
+			new HashSet<>(Arrays.asList(BLOCKED));
+	private static final Set<String> BRIDGES_WORK_IN_COUNTRIES =
+			new HashSet<>(Arrays.asList(BRIDGES));
+
 	@Override
 	public boolean isTorProbablyBlocked(String countryCode) {
 		return BLOCKED_IN_COUNTRIES.contains(countryCode);
@@ -42,26 +46,20 @@ class CircumventionProviderImpl implements CircumventionProvider {
 		return BRIDGES_WORK_IN_COUNTRIES.contains(countryCode);
 	}
 
-	@Override
-	public boolean needsMeek(String countryCode) {
-		return BRIDGES_NEED_MEEK.contains(countryCode);
-	}
-
 	@Override
 	@IoExecutor
-	public List<String> getBridges(boolean useMeek) {
+	public List<String> getBridges() {
-		List<String> bridges = this.bridges;
+		if (this.bridges != null) return this.bridges;
-		if (bridges != null) return new ArrayList<>(bridges);
 
-		InputStream is = getClass().getClassLoader()
+		Resources res = ctx.getResources();
-				.getResourceAsStream(BRIDGE_FILE_NAME);
+		int resId = res.getIdentifier(BRIDGE_FILE_NAME, "raw",
+				ctx.getPackageName());
+		InputStream is = ctx.getResources().openRawResource(resId);
 		Scanner scanner = new Scanner(is);
 
-		bridges = new ArrayList<>();
+		List<String> bridges = new ArrayList<>();
 		while (scanner.hasNextLine()) {
 			String line = scanner.nextLine();
-			boolean isMeekBridge = line.startsWith("Bridge meek");
-			if (useMeek && !isMeekBridge || !useMeek && isMeekBridge) continue;
 			if (!line.startsWith("#")) bridges.add(line);
 		}
 		scanner.close();

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

@@ -0,0 +1,730 @@
+package org.briarproject.bramble.plugin.tor;
+
+import android.content.Context;
+import android.content.pm.PackageInfo;
+import android.content.pm.PackageManager;
+import android.content.pm.PackageManager.NameNotFoundException;
+import android.content.res.Resources;
+import android.os.PowerManager;
+
+import net.freehaven.tor.control.EventHandler;
+import net.freehaven.tor.control.TorControlConnection;
+
+import org.briarproject.bramble.PoliteExecutor;
+import org.briarproject.bramble.api.contact.ContactId;
+import org.briarproject.bramble.api.data.BdfList;
+import org.briarproject.bramble.api.event.Event;
+import org.briarproject.bramble.api.event.EventListener;
+import org.briarproject.bramble.api.keyagreement.KeyAgreementListener;
+import org.briarproject.bramble.api.network.NetworkManager;
+import org.briarproject.bramble.api.network.NetworkStatus;
+import org.briarproject.bramble.api.network.event.NetworkStatusEvent;
+import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
+import org.briarproject.bramble.api.plugin.Backoff;
+import org.briarproject.bramble.api.plugin.PluginException;
+import org.briarproject.bramble.api.plugin.TorConstants;
+import org.briarproject.bramble.api.plugin.TransportId;
+import org.briarproject.bramble.api.plugin.duplex.DuplexPlugin;
+import org.briarproject.bramble.api.plugin.duplex.DuplexPluginCallback;
+import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
+import org.briarproject.bramble.api.properties.TransportProperties;
+import org.briarproject.bramble.api.settings.Settings;
+import org.briarproject.bramble.api.settings.event.SettingsUpdatedEvent;
+import org.briarproject.bramble.api.system.Clock;
+import org.briarproject.bramble.api.system.LocationUtils;
+import org.briarproject.bramble.util.IoUtils;
+import org.briarproject.bramble.util.RenewableWakeLock;
+import org.briarproject.bramble.util.StringUtils;
+
+import java.io.Closeable;
+import java.io.EOFException;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.InetSocketAddress;
+import java.net.ServerSocket;
+import java.net.Socket;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.Scanner;
+import java.util.concurrent.Executor;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.logging.Logger;
+import java.util.regex.Pattern;
+import java.util.zip.ZipInputStream;
+
+import javax.annotation.Nullable;
+import javax.net.SocketFactory;
+
+import static android.content.Context.MODE_PRIVATE;
+import static android.content.Context.POWER_SERVICE;
+import static android.os.PowerManager.PARTIAL_WAKE_LOCK;
+import static java.util.concurrent.TimeUnit.MINUTES;
+import static java.util.logging.Level.INFO;
+import static java.util.logging.Level.WARNING;
+import static net.freehaven.tor.control.TorControlCommands.HS_ADDRESS;
+import static net.freehaven.tor.control.TorControlCommands.HS_PRIVKEY;
+import static org.briarproject.bramble.api.plugin.TorConstants.CONTROL_PORT;
+import static org.briarproject.bramble.api.plugin.TorConstants.ID;
+import static org.briarproject.bramble.api.plugin.TorConstants.PREF_TOR_DISABLE_BLOCKED;
+import static org.briarproject.bramble.api.plugin.TorConstants.PREF_TOR_NETWORK;
+import static org.briarproject.bramble.api.plugin.TorConstants.PREF_TOR_NETWORK_ALWAYS;
+import static org.briarproject.bramble.api.plugin.TorConstants.PREF_TOR_NETWORK_NEVER;
+import static org.briarproject.bramble.api.plugin.TorConstants.PREF_TOR_NETWORK_WIFI;
+import static org.briarproject.bramble.api.plugin.TorConstants.PREF_TOR_PORT;
+import static org.briarproject.bramble.api.plugin.TorConstants.PROP_ONION;
+import static org.briarproject.bramble.util.LogUtils.logException;
+import static org.briarproject.bramble.util.PrivacyUtils.scrubOnion;
+
+@MethodsNotNullByDefault
+@ParametersNotNullByDefault
+class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
+
+	private static final String[] EVENTS = {
+			"CIRC", "ORCONN", "HS_DESC", "NOTICE", "WARN", "ERR"
+	};
+	private static final String OWNER = "__OwningControllerProcess";
+	private static final int COOKIE_TIMEOUT_MS = 3000;
+	private static final int COOKIE_POLLING_INTERVAL_MS = 200;
+	private static final Pattern ONION = Pattern.compile("[a-z2-7]{16}");
+	// This tag may prevent Huawei's power manager from killing us
+	private static final String WAKE_LOCK_TAG = "LocationManagerService";
+	private static final Logger LOG =
+			Logger.getLogger(TorPlugin.class.getName());
+
+	private final Executor ioExecutor, connectionStatusExecutor;
+	private final Context appContext;
+	private final NetworkManager networkManager;
+	private final LocationUtils locationUtils;
+	private final SocketFactory torSocketFactory;
+	private final Clock clock;
+	private final Backoff backoff;
+	private final DuplexPluginCallback callback;
+	private final String architecture;
+	private final CircumventionProvider circumventionProvider;
+	private final int maxLatency, maxIdleTime, socketTimeout;
+	private final ConnectionStatus connectionStatus;
+	private final File torDirectory, torFile, geoIpFile, configFile;
+	private final File doneFile, cookieFile;
+	private final RenewableWakeLock wakeLock;
+	private final AtomicBoolean used = new AtomicBoolean(false);
+
+	private volatile boolean running = false;
+	private volatile ServerSocket socket = null;
+	private volatile Socket controlSocket = null;
+	private volatile TorControlConnection controlConnection = null;
+
+	TorPlugin(Executor ioExecutor, ScheduledExecutorService scheduler,
+			Context appContext, NetworkManager networkManager,
+			LocationUtils locationUtils, SocketFactory torSocketFactory,
+			Clock clock, CircumventionProvider circumventionProvider,
+			Backoff backoff, DuplexPluginCallback callback,
+			String architecture, int maxLatency, int maxIdleTime) {
+		this.ioExecutor = ioExecutor;
+		this.appContext = appContext;
+		this.networkManager = networkManager;
+		this.locationUtils = locationUtils;
+		this.torSocketFactory = torSocketFactory;
+		this.clock = clock;
+		this.backoff = backoff;
+		this.callback = callback;
+		this.architecture = architecture;
+		this.circumventionProvider = circumventionProvider;
+		this.maxLatency = maxLatency;
+		this.maxIdleTime = maxIdleTime;
+		if (maxIdleTime > Integer.MAX_VALUE / 2)
+			socketTimeout = Integer.MAX_VALUE;
+		else socketTimeout = maxIdleTime * 2;
+		connectionStatus = new ConnectionStatus();
+		torDirectory = appContext.getDir("tor", MODE_PRIVATE);
+		torFile = new File(torDirectory, "tor");
+		geoIpFile = new File(torDirectory, "geoip");
+		configFile = new File(torDirectory, "torrc");
+		doneFile = new File(torDirectory, "done");
+		cookieFile = new File(torDirectory, ".tor/control_auth_cookie");
+		// Don't execute more than one connection status check at a time
+		connectionStatusExecutor =
+				new PoliteExecutor("TorPlugin", ioExecutor, 1);
+		PowerManager pm = (PowerManager)
+				appContext.getSystemService(POWER_SERVICE);
+		wakeLock = new RenewableWakeLock(pm, scheduler, PARTIAL_WAKE_LOCK,
+				WAKE_LOCK_TAG, 1, MINUTES);
+	}
+
+	@Override
+	public TransportId getId() {
+		return TorConstants.ID;
+	}
+
+	@Override
+	public int getMaxLatency() {
+		return maxLatency;
+	}
+
+	@Override
+	public int getMaxIdleTime() {
+		return maxIdleTime;
+	}
+
+	@Override
+	public void start() throws PluginException {
+		if (used.getAndSet(true)) throw new IllegalStateException();
+		// Install or update the assets if necessary
+		if (!assetsAreUpToDate()) installAssets();
+		if (cookieFile.exists() && !cookieFile.delete())
+			LOG.warning("Old auth cookie not deleted");
+		// Start a new Tor process
+		LOG.info("Starting Tor");
+		String torPath = torFile.getAbsolutePath();
+		String configPath = configFile.getAbsolutePath();
+		String pid = String.valueOf(android.os.Process.myPid());
+		Process torProcess;
+		ProcessBuilder pb =
+				new ProcessBuilder(torPath, "-f", configPath, OWNER, pid);
+		Map<String, String> env = pb.environment();
+		env.put("HOME", torDirectory.getAbsolutePath());
+		pb.directory(torDirectory);
+		try {
+			torProcess = pb.start();
+		} catch (SecurityException | IOException e) {
+			throw new PluginException(e);
+		}
+		// Log the process's standard output until it detaches
+		if (LOG.isLoggable(INFO)) {
+			Scanner stdout = new Scanner(torProcess.getInputStream());
+			Scanner stderr = new Scanner(torProcess.getErrorStream());
+			while (stdout.hasNextLine() || stderr.hasNextLine()) {
+				if (stdout.hasNextLine()) {
+					LOG.info(stdout.nextLine());
+				}
+				if (stderr.hasNextLine()) {
+					LOG.info(stderr.nextLine());
+				}
+			}
+			stdout.close();
+			stderr.close();
+		}
+		try {
+			// Wait for the process to detach or exit
+			int exit = torProcess.waitFor();
+			if (exit != 0) {
+				if (LOG.isLoggable(WARNING))
+					LOG.warning("Tor exited with value " + exit);
+				throw new PluginException();
+			}
+			// Wait for the auth cookie file to be created/updated
+			long start = clock.currentTimeMillis();
+			while (cookieFile.length() < 32) {
+				if (clock.currentTimeMillis() - start > COOKIE_TIMEOUT_MS) {
+					LOG.warning("Auth cookie not created");
+					if (LOG.isLoggable(INFO)) listFiles(torDirectory);
+					throw new PluginException();
+				}
+				Thread.sleep(COOKIE_POLLING_INTERVAL_MS);
+			}
+			LOG.info("Auth cookie created");
+		} catch (InterruptedException e) {
+			LOG.warning("Interrupted while starting Tor");
+			Thread.currentThread().interrupt();
+			throw new PluginException();
+		}
+		try {
+			// Open a control connection and authenticate using the cookie file
+			controlSocket = new Socket("127.0.0.1", CONTROL_PORT);
+			controlConnection = new TorControlConnection(controlSocket);
+			controlConnection.authenticate(read(cookieFile));
+			// Tell Tor to exit when the control connection is closed
+			controlConnection.takeOwnership();
+			controlConnection.resetConf(Collections.singletonList(OWNER));
+			running = true;
+			// Register to receive events from the Tor process
+			controlConnection.setEventHandler(this);
+			controlConnection.setEvents(Arrays.asList(EVENTS));
+			// Check whether Tor has already bootstrapped
+			String phase = controlConnection.getInfo("status/bootstrap-phase");
+			if (phase != null && phase.contains("PROGRESS=100")) {
+				LOG.info("Tor has already bootstrapped");
+				connectionStatus.setBootstrapped();
+			}
+		} catch (IOException e) {
+			throw new PluginException(e);
+		}
+		// Check whether we're online
+		updateConnectionStatus(networkManager.getNetworkStatus());
+		// Bind a server socket to receive incoming hidden service connections
+		bind();
+	}
+
+	private boolean assetsAreUpToDate() {
+		try {
+			PackageManager pm = appContext.getPackageManager();
+			PackageInfo pi = pm.getPackageInfo(appContext.getPackageName(), 0);
+			return doneFile.lastModified() > pi.lastUpdateTime;
+		} catch (NameNotFoundException e) {
+			throw new RuntimeException(e);
+		}
+	}
+
+	private void installAssets() throws PluginException {
+		InputStream in = null;
+		OutputStream out = null;
+		try {
+			doneFile.delete();
+			// Unzip the Tor binary to the filesystem
+			in = getTorInputStream();
+			out = new FileOutputStream(torFile);
+			IoUtils.copyAndClose(in, out);
+			// Make the Tor binary executable
+			if (!torFile.setExecutable(true, true)) throw new IOException();
+			// Unzip the GeoIP database to the filesystem
+			in = getGeoIpInputStream();
+			out = new FileOutputStream(geoIpFile);
+			IoUtils.copyAndClose(in, out);
+			// Copy the config file to the filesystem
+			in = getConfigInputStream();
+			out = new FileOutputStream(configFile);
+			IoUtils.copyAndClose(in, out);
+			doneFile.createNewFile();
+		} catch (IOException e) {
+			tryToClose(in);
+			tryToClose(out);
+			throw new PluginException(e);
+		}
+	}
+
+	private InputStream getTorInputStream() throws IOException {
+		if (LOG.isLoggable(INFO))
+			LOG.info("Installing Tor binary for " + architecture);
+		int resId = getResourceId("tor_" + architecture);
+		InputStream in = appContext.getResources().openRawResource(resId);
+		ZipInputStream zin = new ZipInputStream(in);
+		if (zin.getNextEntry() == null) throw new IOException();
+		return zin;
+	}
+
+	private InputStream getGeoIpInputStream() throws IOException {
+		int resId = getResourceId("geoip");
+		InputStream in = appContext.getResources().openRawResource(resId);
+		ZipInputStream zin = new ZipInputStream(in);
+		if (zin.getNextEntry() == null) throw new IOException();
+		return zin;
+	}
+
+	private InputStream getConfigInputStream() {
+		int resId = getResourceId("torrc");
+		return appContext.getResources().openRawResource(resId);
+	}
+
+	private int getResourceId(String filename) {
+		Resources res = appContext.getResources();
+		return res.getIdentifier(filename, "raw", appContext.getPackageName());
+	}
+
+	private void tryToClose(@Nullable Closeable c) {
+		try {
+			if (c != null) c.close();
+		} catch (IOException e) {
+			logException(LOG, WARNING, e);
+		}
+	}
+
+	private void tryToClose(@Nullable Socket s) {
+		try {
+			if (s != null) s.close();
+		} catch (IOException e) {
+			logException(LOG, WARNING, e);
+		}
+	}
+
+	private void listFiles(File f) {
+		if (f.isDirectory()) {
+			File[] children = f.listFiles();
+			if (children != null) for (File child : children) listFiles(child);
+		} else {
+			LOG.info(f.getAbsolutePath() + " " + f.length());
+		}
+	}
+
+	private byte[] read(File f) throws IOException {
+		byte[] b = new byte[(int) f.length()];
+		FileInputStream in = new FileInputStream(f);
+		try {
+			int offset = 0;
+			while (offset < b.length) {
+				int read = in.read(b, offset, b.length - offset);
+				if (read == -1) throw new EOFException();
+				offset += read;
+			}
+			return b;
+		} finally {
+			tryToClose(in);
+		}
+	}
+
+	private void bind() {
+		ioExecutor.execute(() -> {
+			// If there's already a port number stored in config, reuse it
+			String portString = callback.getSettings().get(PREF_TOR_PORT);
+			int port;
+			if (StringUtils.isNullOrEmpty(portString)) port = 0;
+			else port = Integer.parseInt(portString);
+			// Bind a server socket to receive connections from Tor
+			ServerSocket ss = null;
+			try {
+				ss = new ServerSocket();
+				ss.bind(new InetSocketAddress("127.0.0.1", port));
+			} catch (IOException e) {
+				logException(LOG, WARNING, e);
+				tryToClose(ss);
+				return;
+			}
+			if (!running) {
+				tryToClose(ss);
+				return;
+			}
+			socket = ss;
+			// Store the port number
+			String localPort = String.valueOf(ss.getLocalPort());
+			Settings s = new Settings();
+			s.put(PREF_TOR_PORT, localPort);
+			callback.mergeSettings(s);
+			// Create a hidden service if necessary
+			ioExecutor.execute(() -> publishHiddenService(localPort));
+			backoff.reset();
+			// Accept incoming hidden service connections from Tor
+			acceptContactConnections(ss);
+		});
+	}
+
+	private void tryToClose(@Nullable ServerSocket ss) {
+		try {
+			if (ss != null) ss.close();
+		} catch (IOException e) {
+			logException(LOG, WARNING, e);
+		} finally {
+			callback.transportDisabled();
+		}
+	}
+
+	private void publishHiddenService(String port) {
+		if (!running) return;
+		LOG.info("Creating hidden service");
+		String privKey = callback.getSettings().get(HS_PRIVKEY);
+		Map<Integer, String> portLines =
+				Collections.singletonMap(80, "127.0.0.1:" + port);
+		Map<String, String> response;
+		try {
+			// Use the control connection to set up the hidden service
+			if (privKey == null)
+				response = controlConnection.addOnion(portLines);
+			else response = controlConnection.addOnion(privKey, portLines);
+		} catch (IOException e) {
+			logException(LOG, WARNING, e);
+			return;
+		}
+		if (!response.containsKey(HS_ADDRESS)) {
+			LOG.warning("Tor did not return a hidden service address");
+			return;
+		}
+		if (privKey == null && !response.containsKey(HS_PRIVKEY)) {
+			LOG.warning("Tor did not return a private key");
+			return;
+		}
+		// Publish the hidden service's onion hostname in transport properties
+		String hostname = response.get(HS_ADDRESS);
+		if (LOG.isLoggable(INFO))
+			LOG.info("Hidden service " + scrubOnion(hostname));
+		TransportProperties p = new TransportProperties();
+		p.put(PROP_ONION, hostname);
+		callback.mergeLocalProperties(p);
+		if (privKey == null) {
+			// Save the hidden service's private key for next time
+			Settings s = new Settings();
+			s.put(HS_PRIVKEY, response.get(HS_PRIVKEY));
+			callback.mergeSettings(s);
+		}
+	}
+
+	private void acceptContactConnections(ServerSocket ss) {
+		while (running) {
+			Socket s;
+			try {
+				s = ss.accept();
+				s.setSoTimeout(socketTimeout);
+			} catch (IOException e) {
+				// This is expected when the socket is closed
+				if (LOG.isLoggable(INFO)) LOG.info(e.toString());
+				return;
+			}
+			LOG.info("Connection received");
+			backoff.reset();
+			TorTransportConnection conn = new TorTransportConnection(this, s);
+			callback.incomingConnectionCreated(conn);
+		}
+	}
+
+	private void enableNetwork(boolean enable) throws IOException {
+		if (!running) return;
+		if (enable) wakeLock.acquire();
+		connectionStatus.enableNetwork(enable);
+		controlConnection.setConf("DisableNetwork", enable ? "0" : "1");
+		if (!enable) {
+			callback.transportDisabled();
+			wakeLock.release();
+		}
+	}
+
+	private void enableBridges(boolean enable) throws IOException {
+		if (enable) {
+			Collection<String> conf = new ArrayList<>();
+			conf.add("UseBridges 1");
+			conf.addAll(circumventionProvider.getBridges());
+			controlConnection.setConf(conf);
+		} else {
+			controlConnection.setConf("UseBridges", "0");
+		}
+	}
+
+	@Override
+	public void stop() {
+		running = false;
+		tryToClose(socket);
+		if (controlSocket != null && controlConnection != null) {
+			try {
+				LOG.info("Stopping Tor");
+				controlConnection.setConf("DisableNetwork", "1");
+				controlConnection.shutdownTor("TERM");
+				controlSocket.close();
+			} catch (IOException e) {
+				logException(LOG, WARNING, e);
+			}
+		}
+		wakeLock.release();
+	}
+
+	@Override
+	public boolean isRunning() {
+		return running && connectionStatus.isConnected();
+	}
+
+	@Override
+	public boolean shouldPoll() {
+		return true;
+	}
+
+	@Override
+	public int getPollingInterval() {
+		return backoff.getPollingInterval();
+	}
+
+	@Override
+	public void poll(Map<ContactId, TransportProperties> contacts) {
+		if (!isRunning()) return;
+		backoff.increment();
+		for (Entry<ContactId, TransportProperties> e : contacts.entrySet()) {
+			connectAndCallBack(e.getKey(), e.getValue());
+		}
+	}
+
+	private void connectAndCallBack(ContactId c, TransportProperties p) {
+		ioExecutor.execute(() -> {
+			DuplexTransportConnection d = createConnection(p);
+			if (d != null) {
+				backoff.reset();
+				callback.outgoingConnectionCreated(c, d);
+			}
+		});
+	}
+
+	@Override
+	public DuplexTransportConnection createConnection(TransportProperties p) {
+		if (!isRunning()) return null;
+		String onion = p.get(PROP_ONION);
+		if (StringUtils.isNullOrEmpty(onion)) return null;
+		if (!ONION.matcher(onion).matches()) {
+			// not scrubbing this address, so we are able to find the problem
+			if (LOG.isLoggable(INFO)) LOG.info("Invalid hostname: " + onion);
+			return null;
+		}
+		Socket s = null;
+		try {
+			if (LOG.isLoggable(INFO))
+				LOG.info("Connecting to " + scrubOnion(onion));
+			s = torSocketFactory.createSocket(onion + ".onion", 80);
+			s.setSoTimeout(socketTimeout);
+			if (LOG.isLoggable(INFO))
+				LOG.info("Connected to " + scrubOnion(onion));
+			return new TorTransportConnection(this, s);
+		} catch (IOException e) {
+			if (LOG.isLoggable(INFO)) {
+				LOG.info("Could not connect to " + scrubOnion(onion) + ": " +
+						e.toString());
+			}
+			tryToClose(s);
+			return null;
+		}
+	}
+
+	@Override
+	public boolean supportsKeyAgreement() {
+		return false;
+	}
+
+	@Override
+	public KeyAgreementListener createKeyAgreementListener(byte[] commitment) {
+		throw new UnsupportedOperationException();
+	}
+
+	@Override
+	public DuplexTransportConnection createKeyAgreementConnection(
+			byte[] commitment, BdfList descriptor) {
+		throw new UnsupportedOperationException();
+	}
+
+	@Override
+	public void circuitStatus(String status, String id, String path) {
+		if (status.equals("BUILT") &&
+				connectionStatus.getAndSetCircuitBuilt()) {
+			LOG.info("First circuit built");
+			backoff.reset();
+			if (isRunning()) callback.transportEnabled();
+		}
+	}
+
+	@Override
+	public void streamStatus(String status, String id, String target) {
+	}
+
+	@Override
+	public void orConnStatus(String status, String orName) {
+		if (LOG.isLoggable(INFO)) LOG.info("OR connection " + status);
+		if (status.equals("CLOSED") || status.equals("FAILED")) {
+			// Check whether we've lost connectivity
+			updateConnectionStatus(networkManager.getNetworkStatus());
+		}
+	}
+
+	@Override
+	public void bandwidthUsed(long read, long written) {
+	}
+
+	@Override
+	public void newDescriptors(List<String> orList) {
+	}
+
+	@Override
+	public void message(String severity, String msg) {
+		if (LOG.isLoggable(INFO)) LOG.info(severity + " " + msg);
+		if (severity.equals("NOTICE") && msg.startsWith("Bootstrapped 100%")) {
+			connectionStatus.setBootstrapped();
+			backoff.reset();
+			if (isRunning()) callback.transportEnabled();
+		}
+	}
+
+	@Override
+	public void unrecognized(String type, String msg) {
+		if (type.equals("HS_DESC") && msg.startsWith("UPLOADED"))
+			LOG.info("Descriptor uploaded");
+	}
+
+	@Override
+	public void eventOccurred(Event e) {
+		if (e instanceof SettingsUpdatedEvent) {
+			SettingsUpdatedEvent s = (SettingsUpdatedEvent) e;
+			if (s.getNamespace().equals(ID.getString())) {
+				LOG.info("Tor settings updated");
+				updateConnectionStatus(networkManager.getNetworkStatus());
+			}
+		} else if (e instanceof NetworkStatusEvent) {
+			updateConnectionStatus(((NetworkStatusEvent) e).getStatus());
+		}
+	}
+
+	private void updateConnectionStatus(NetworkStatus status) {
+		connectionStatusExecutor.execute(() -> {
+			if (!running) return;
+			boolean online = status.isConnected();
+			boolean wifi = status.isWifi();
+			String country = locationUtils.getCurrentCountry();
+			boolean blocked =
+					circumventionProvider.isTorProbablyBlocked(country);
+			Settings s = callback.getSettings();
+			int network = s.getInt(PREF_TOR_NETWORK, PREF_TOR_NETWORK_ALWAYS);
+			boolean disableWhenBlocked =
+					s.getBoolean(PREF_TOR_DISABLE_BLOCKED, true);
+
+			if (LOG.isLoggable(INFO)) {
+				LOG.info("Online: " + online + ", wifi: " + wifi);
+				if ("".equals(country)) LOG.info("Country code unknown");
+				else LOG.info("Country code: " + country);
+			}
+
+			try {
+				if (!online) {
+					LOG.info("Disabling network, device is offline");
+					enableNetwork(false);
+				} else if (network == PREF_TOR_NETWORK_NEVER
+						|| (network == PREF_TOR_NETWORK_WIFI && !wifi)) {
+					LOG.info("Disabling network due to data setting");
+					enableNetwork(false);
+				} else if (blocked) {
+					if (circumventionProvider.doBridgesWork(country)) {
+						LOG.info("Enabling network, using bridges");
+						enableBridges(true);
+						enableNetwork(true);
+					} else if (disableWhenBlocked) {
+						LOG.info("Disabling network, country is blocked");
+						enableNetwork(false);
+					} else {
+						LOG.info("Enabling network but country is blocked");
+						enableBridges(false);
+						enableNetwork(true);
+					}
+				} else {
+					LOG.info("Enabling network");
+					enableBridges(false);
+					enableNetwork(true);
+				}
+			} catch (IOException e) {
+				logException(LOG, WARNING, e);
+			}
+		});
+	}
+
+	private static class ConnectionStatus {
+
+		// All of the following are locking: this
+		private boolean networkEnabled = false;
+		private boolean bootstrapped = false, circuitBuilt = false;
+
+		private synchronized void setBootstrapped() {
+			bootstrapped = true;
+		}
+
+		private synchronized boolean getAndSetCircuitBuilt() {
+			boolean firstCircuit = !circuitBuilt;
+			circuitBuilt = true;
+			return firstCircuit;
+		}
+
+		private synchronized void enableNetwork(boolean enable) {
+			networkEnabled = enable;
+			if (!enable) circuitBuilt = false;
+		}
+
+		private synchronized boolean isConnected() {
+			return networkEnabled && bootstrapped && circuitBuilt;
+		}
+	}
+}

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

@@ -1,19 +1,20 @@
 package org.briarproject.bramble.plugin.tor;
 
 import android.content.Context;
+import android.os.Build;
 
-import org.briarproject.bramble.api.battery.BatteryManager;
 import org.briarproject.bramble.api.event.EventBus;
 import org.briarproject.bramble.api.network.NetworkManager;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.plugin.PluginCallback;
+import org.briarproject.bramble.api.plugin.Backoff;
+import org.briarproject.bramble.api.plugin.BackoffFactory;
 import org.briarproject.bramble.api.plugin.TorConstants;
 import org.briarproject.bramble.api.plugin.TransportId;
 import org.briarproject.bramble.api.plugin.duplex.DuplexPlugin;
+import org.briarproject.bramble.api.plugin.duplex.DuplexPluginCallback;
 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.util.AndroidUtils;
 
 import java.util.concurrent.Executor;
@@ -23,33 +24,18 @@ import java.util.logging.Logger;
 import javax.annotation.concurrent.Immutable;
 import javax.net.SocketFactory;
 
-import static java.util.concurrent.TimeUnit.MINUTES;
-import static java.util.concurrent.TimeUnit.SECONDS;
-import static java.util.logging.Logger.getLogger;
-
 @Immutable
 @NotNullByDefault
-public class AndroidTorPluginFactory implements DuplexPluginFactory {
+public class TorPluginFactory implements DuplexPluginFactory {
 
 	private static final Logger LOG =
-			getLogger(AndroidTorPluginFactory.class.getName());
+			Logger.getLogger(TorPluginFactory.class.getName());
 
-	private static final int MAX_LATENCY = (int) SECONDS.toMillis(30);
+	private static final int MAX_LATENCY = 30 * 1000; // 30 seconds
-	private static final int MAX_IDLE_TIME = (int) SECONDS.toMillis(30);
+	private static final int MAX_IDLE_TIME = 30 * 1000; // 30 seconds
-
+	private static final int MIN_POLLING_INTERVAL = 60 * 1000; // 1 minute
-	/**
+	private static final int MAX_POLLING_INTERVAL = 10 * 60 * 1000; // 10 mins
-	 * How often to poll before our hidden service becomes reachable.
+	private static final double BACKOFF_BASE = 1.2;
-	 */
-	private static final int INITIAL_POLLING_INTERVAL =
-			(int) MINUTES.toMillis(1);
-
-	/**
-	 * How often to poll when our hidden service is reachable. Our contacts
-	 * will poll when they come online, so our polling is just a fallback in
-	 * case of repeated connection failures.
-	 */
-	private static final int STABLE_POLLING_INTERVAL =
-			(int) MINUTES.toMillis(15);
 
 	private final Executor ioExecutor;
 	private final ScheduledExecutorService scheduler;
@@ -58,18 +44,16 @@ public class AndroidTorPluginFactory implements DuplexPluginFactory {
 	private final LocationUtils locationUtils;
 	private final EventBus eventBus;
 	private final SocketFactory torSocketFactory;
-	private final ResourceProvider resourceProvider;
+	private final BackoffFactory backoffFactory;
 	private final CircumventionProvider circumventionProvider;
-	private final BatteryManager batteryManager;
 	private final Clock clock;
 
-	public AndroidTorPluginFactory(Executor ioExecutor,
+	public TorPluginFactory(Executor ioExecutor,
 			ScheduledExecutorService scheduler, Context appContext,
 			NetworkManager networkManager, LocationUtils locationUtils,
 			EventBus eventBus, SocketFactory torSocketFactory,
-			ResourceProvider resourceProvider,
+			BackoffFactory backoffFactory,
-			CircumventionProvider circumventionProvider,
+			CircumventionProvider circumventionProvider, Clock clock) {
-			BatteryManager batteryManager, Clock clock) {
 		this.ioExecutor = ioExecutor;
 		this.scheduler = scheduler;
 		this.appContext = appContext;
@@ -77,9 +61,8 @@ public class AndroidTorPluginFactory implements DuplexPluginFactory {
 		this.locationUtils = locationUtils;
 		this.eventBus = eventBus;
 		this.torSocketFactory = torSocketFactory;
-		this.resourceProvider = resourceProvider;
+		this.backoffFactory = backoffFactory;
 		this.circumventionProvider = circumventionProvider;
-		this.batteryManager = batteryManager;
 		this.clock = clock;
 	}
 
@@ -94,20 +77,14 @@ public class AndroidTorPluginFactory implements DuplexPluginFactory {
 	}
 
 	@Override
-	public DuplexPlugin createPlugin(PluginCallback callback) {
+	public DuplexPlugin createPlugin(DuplexPluginCallback callback) {
 
 		// Check that we have a Tor binary for this architecture
 		String architecture = null;
 		for (String abi : AndroidUtils.getSupportedArchitectures()) {
-			if (abi.startsWith("x86_64")) {
+			if (abi.startsWith("x86")) {
-				architecture = "x86_64";
-				break;
-			} else if (abi.startsWith("x86")) {
 				architecture = "x86";
 				break;
-			} else if (abi.startsWith("arm64")) {
-				architecture = "arm64";
-				break;
 			} else if (abi.startsWith("armeabi")) {
 				architecture = "arm";
 				break;
@@ -117,16 +94,15 @@ public class AndroidTorPluginFactory implements DuplexPluginFactory {
 			LOG.info("Tor is not supported on this architecture");
 			return null;
 		}
-		// Use position-independent executable
+		// Use position-independent executable for SDK >= 16
-		architecture += "_pie";
+		if (Build.VERSION.SDK_INT >= 16) architecture += "_pie";
 
-		TorRendezvousCrypto torRendezvousCrypto = new TorRendezvousCryptoImpl();
+		Backoff backoff = backoffFactory.createBackoff(MIN_POLLING_INTERVAL,
-		AndroidTorPlugin plugin = new AndroidTorPlugin(ioExecutor, scheduler,
+				MAX_POLLING_INTERVAL, BACKOFF_BASE);
-				appContext, networkManager, locationUtils, torSocketFactory,
+		TorPlugin plugin = new TorPlugin(ioExecutor, scheduler, appContext,
-				clock, resourceProvider, circumventionProvider, batteryManager,
+				networkManager, locationUtils, torSocketFactory, clock,
-				torRendezvousCrypto, callback, architecture, MAX_LATENCY,
+				circumventionProvider, backoff, callback, architecture,
-				MAX_IDLE_TIME, INITIAL_POLLING_INTERVAL,
+				MAX_LATENCY, MAX_IDLE_TIME);
-				STABLE_POLLING_INTERVAL);
 		eventBus.addListener(plugin);
 		return plugin;
 	}

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

@@ -61,12 +61,12 @@ class AndroidLocationUtils implements LocationUtils {
 	private String getCountryFromPhoneNetwork() {
 		Object o = appContext.getSystemService(TELEPHONY_SERVICE);
 		TelephonyManager tm = (TelephonyManager) o;
-		return tm == null ? "" : tm.getNetworkCountryIso();
+		return tm.getNetworkCountryIso();
 	}
 
 	private String getCountryFromSimCard() {
 		Object o = appContext.getSystemService(TELEPHONY_SERVICE);
 		TelephonyManager tm = (TelephonyManager) o;
-		return tm == null ? "" : tm.getSimCountryIso();
+		return tm.getSimCountryIso();
 	}
 }

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

@@ -1,32 +0,0 @@
-package org.briarproject.bramble.system;
-
-import android.app.Application;
-import android.content.Context;
-import android.content.res.Resources;
-
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.system.ResourceProvider;
-
-import java.io.InputStream;
-
-import javax.inject.Inject;
-
-@NotNullByDefault
-class AndroidResourceProvider implements ResourceProvider {
-
-	private final Context appContext;
-
-	@Inject
-	AndroidResourceProvider(Application app) {
-		this.appContext = app.getApplicationContext();
-	}
-
-	@Override
-	public InputStream getResourceInputStream(String name, String extension) {
-		Resources res = appContext.getResources();
-		// extension is ignored on Android, resources are retrieved without it
-		int resId =
-				res.getIdentifier(name, "raw", appContext.getPackageName());
-		return res.openRawResource(resId);
-	}
-}

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

@@ -1,6 +1,5 @@
 package org.briarproject.bramble.system;
 
-import android.annotation.SuppressLint;
 import android.app.Application;
 import android.bluetooth.BluetoothAdapter;
 import android.bluetooth.BluetoothDevice;
@@ -23,12 +22,11 @@ import javax.annotation.concurrent.Immutable;
 import javax.inject.Inject;
 
 import static android.content.Context.WIFI_SERVICE;
-import static android.os.Build.VERSION.SDK_INT;
 import static android.provider.Settings.Secure.ANDROID_ID;
 
 @Immutable
 @NotNullByDefault
-class AndroidSecureRandomProvider extends UnixSecureRandomProvider {
+class AndroidSecureRandomProvider extends LinuxSecureRandomProvider {
 
 	private static final int SEED_LENGTH = 32;
 
@@ -39,7 +37,6 @@ class AndroidSecureRandomProvider extends UnixSecureRandomProvider {
 		appContext = app.getApplicationContext();
 	}
 
-	@SuppressLint("HardwareIds")
 	@Override
 	protected void writeToEntropyPool(DataOutputStream out) throws IOException {
 		super.writeToEntropyPool(out);
@@ -52,14 +49,12 @@ class AndroidSecureRandomProvider extends UnixSecureRandomProvider {
 		String id = Settings.Secure.getString(contentResolver, ANDROID_ID);
 		if (id != null) out.writeUTF(id);
 		Parcel parcel = Parcel.obtain();
-		WifiManager wm = (WifiManager) appContext.getApplicationContext()
+		WifiManager wm =
-				.getSystemService(WIFI_SERVICE);
+				(WifiManager) appContext.getSystemService(WIFI_SERVICE);
-		if (wm != null) {
+		List<WifiConfiguration> configs = wm.getConfiguredNetworks();
-			List<WifiConfiguration> configs = wm.getConfiguredNetworks();
+		if (configs != null) {
-			if (configs != null) {
+			for (WifiConfiguration config : configs)
-				for (WifiConfiguration config : configs)
+				parcel.writeParcelable(config, 0);
-					parcel.writeParcelable(config, 0);
-			}
 		}
 		BluetoothAdapter bt = BluetoothAdapter.getDefaultAdapter();
 		if (bt != null) {
@@ -75,19 +70,20 @@ class AndroidSecureRandomProvider extends UnixSecureRandomProvider {
 		// Silence strict mode
 		StrictMode.ThreadPolicy tp = StrictMode.allowThreadDiskWrites();
 		super.writeSeed();
-		if (SDK_INT <= 18) applyOpenSslFix();
+		if (Build.VERSION.SDK_INT >= 16 && Build.VERSION.SDK_INT <= 18)
+			applyOpenSslFix();
 		StrictMode.setThreadPolicy(tp);
 	}
 
 	// Based on https://android-developers.googleblog.com/2013/08/some-securerandom-thoughts.html
 	private void applyOpenSslFix() {
-		byte[] seed = new UnixSecureRandomSpi().engineGenerateSeed(
+		byte[] seed = new LinuxSecureRandomSpi().engineGenerateSeed(
 				SEED_LENGTH);
 		try {
 			// Seed the OpenSSL PRNG
 			Class.forName("org.apache.harmony.xnet.provider.jsse.NativeCrypto")
 					.getMethod("RAND_seed", byte[].class)
-					.invoke(null, (Object) seed);
+					.invoke(null, seed);
 			// Mix the output of the Linux PRNG into the OpenSSL PRNG
 			int bytesRead = (Integer) Class.forName(
 					"org.apache.harmony.xnet.provider.jsse.NativeCrypto")

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

@@ -1,13 +1,11 @@
 package org.briarproject.bramble.system;
 
-import org.briarproject.bramble.api.event.EventExecutor;
+import android.app.Application;
+
 import org.briarproject.bramble.api.system.AndroidExecutor;
 import org.briarproject.bramble.api.system.LocationUtils;
-import org.briarproject.bramble.api.system.ResourceProvider;
 import org.briarproject.bramble.api.system.SecureRandomProvider;
 
-import java.util.concurrent.Executor;
-
 import javax.inject.Singleton;
 
 import dagger.Module;
@@ -18,33 +16,18 @@ public class AndroidSystemModule {
 
 	@Provides
 	@Singleton
-	SecureRandomProvider provideSecureRandomProvider(
+	SecureRandomProvider provideSecureRandomProvider(Application app) {
-			AndroidSecureRandomProvider provider) {
+		return new AndroidSecureRandomProvider(app);
-		return provider;
 	}
 
 	@Provides
-	LocationUtils provideLocationUtils(AndroidLocationUtils locationUtils) {
+	LocationUtils provideLocationUtils(Application app) {
-		return locationUtils;
+		return new AndroidLocationUtils(app);
 	}
 
 	@Provides
 	@Singleton
-	AndroidExecutor provideAndroidExecutor(
+	AndroidExecutor provideAndroidExecutor(Application app) {
-			AndroidExecutorImpl androidExecutor) {
+		return new AndroidExecutorImpl(app);
-		return androidExecutor;
-	}
-
-	@Provides
-	@Singleton
-	@EventExecutor
-	Executor provideEventExecutor(AndroidExecutor androidExecutor) {
-		return androidExecutor::runOnUiThread;
-	}
-
-	@Provides
-	@Singleton
-	ResourceProvider provideResourceProvider(AndroidResourceProvider provider) {
-		return provider;
 	}
 }

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

@@ -3,41 +3,33 @@ package org.briarproject.bramble.util;
 import android.annotation.SuppressLint;
 import android.bluetooth.BluetoothAdapter;
 import android.content.Context;
-import android.content.pm.PackageInfo;
-import android.content.pm.PackageManager;
 import android.os.Build;
 import android.provider.Settings;
 
-import org.briarproject.bramble.api.Pair;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
 import java.io.File;
-import java.lang.reflect.Field;
-import java.lang.reflect.InvocationTargetException;
-import java.lang.reflect.Method;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collection;
 import java.util.List;
-
+import java.util.logging.Logger;
-import javax.annotation.Nullable;
 
 import static android.content.Context.MODE_PRIVATE;
-import static android.os.Build.VERSION.SDK_INT;
-import static java.util.Arrays.asList;
-import static org.briarproject.bramble.api.nullsafety.NullSafety.requireNonNull;
 
-@NotNullByDefault
 public class AndroidUtils {
 
+	private static final Logger LOG =
+			Logger.getLogger(AndroidUtils.class.getName());
+
 	// Fake Bluetooth address returned by BluetoothAdapter on API 23 and later
 	private static final String FAKE_BLUETOOTH_ADDRESS = "02:00:00:00:00:00";
 
 	private static final String STORED_REPORTS = "dev-reports";
 
+	@SuppressWarnings("deprecation")
 	public static Collection<String> getSupportedArchitectures() {
 		List<String> abis = new ArrayList<>();
-		if (SDK_INT >= 21) {
+		if (Build.VERSION.SDK_INT >= 21) {
-			abis.addAll(asList(Build.SUPPORTED_ABIS));
+			abis.addAll(Arrays.asList(Build.SUPPORTED_ABIS));
 		} else {
 			abis.add(Build.CPU_ABI);
 			if (Build.CPU_ABI2 != null) abis.add(Build.CPU_ABI2);
@@ -47,89 +39,25 @@ public class AndroidUtils {
 
 	public static String getBluetoothAddress(Context ctx,
 			BluetoothAdapter adapter) {
-		return getBluetoothAddressAndMethod(ctx, adapter).getFirst();
-	}
-
-	public static Pair<String, String> getBluetoothAddressAndMethod(Context ctx,
-			BluetoothAdapter adapter) {
 		// Return the adapter's address if it's valid and not fake
 		@SuppressLint("HardwareIds")
 		String address = adapter.getAddress();
-		if (isValidBluetoothAddress(address)) {
+		if (isValidBluetoothAddress(address)) return address;
-			return new Pair<>(address, "adapter");
-		}
 		// Return the address from settings if it's valid and not fake
 		address = Settings.Secure.getString(ctx.getContentResolver(),
 				"bluetooth_address");
-		if (isValidBluetoothAddress(address)) {
+		if (isValidBluetoothAddress(address)) return address;
-			return new Pair<>(address, "settings");
-		}
-		// Try to get the address via reflection
-		address = getBluetoothAddressByReflection(adapter);
-		if (isValidBluetoothAddress(address)) {
-			return new Pair<>(requireNonNull(address), "reflection");
-		}
 		// Let the caller know we can't find the address
-		return new Pair<>("", "");
+		return "";
 	}
 
-	public static boolean isValidBluetoothAddress(@Nullable String address) {
+	private static boolean isValidBluetoothAddress(String address) {
 		return !StringUtils.isNullOrEmpty(address)
 				&& BluetoothAdapter.checkBluetoothAddress(address)
 				&& !address.equals(FAKE_BLUETOOTH_ADDRESS);
 	}
 
-	@Nullable
-	private static String getBluetoothAddressByReflection(
-			BluetoothAdapter adapter) {
-		try {
-			Field mServiceField =
-					adapter.getClass().getDeclaredField("mService");
-			mServiceField.setAccessible(true);
-			Object mService = mServiceField.get(adapter);
-			// mService may be null when Bluetooth is disabled
-			if (mService == null) throw new NoSuchFieldException();
-			Method getAddressMethod =
-					mService.getClass().getMethod("getAddress");
-			return (String) getAddressMethod.invoke(mService);
-		} catch (NoSuchFieldException e) {
-			return null;
-		} catch (IllegalAccessException e) {
-			return null;
-		} catch (NoSuchMethodException e) {
-			return null;
-		} catch (InvocationTargetException e) {
-			return null;
-		} catch (SecurityException e) {
-			return null;
-		}
-	}
-
 	public static File getReportDir(Context ctx) {
 		return ctx.getDir(STORED_REPORTS, MODE_PRIVATE);
 	}
-
-	/**
-	 * Returns an array of supported content types for image attachments.
-	 * GIFs can't be compressed on API < 24 so they're not supported.
-	 * <p>
-	 * TODO: Remove this restriction when large message support is added
-	 */
-	public static String[] getSupportedImageContentTypes() {
-		if (SDK_INT < 24) return new String[] {"image/jpeg", "image/png"};
-		else return new String[] {"image/jpeg", "image/png", "image/gif"};
-	}
-
-	public static String getWakeLockTag(Context ctx) {
-		PackageManager pm = ctx.getPackageManager();
-		for (PackageInfo info : pm.getInstalledPackages(0)) {
-			String name = info.packageName.toLowerCase();
-			if (name.startsWith("com.huawei.powergenie")) {
-				return "LocationManagerService";
-			} else if (name.startsWith("com.evenwell.powermonitor")) {
-				return "AudioIn";
-			}
-		}
-		return ctx.getPackageName();
-	}
 }

bramble-android/src/main/res/raw/bridges

@@ -0,0 +1,8 @@
+Bridge 131.252.210.150:8081 0E858AC201BF0F3FA3C462F64844CBFFC7297A42
+Bridge 67.205.189.122:8443 12D64D5D44E20169585E7378580C0D33A872AD98
+Bridge 45.32.148.146:8443 0CE016FB2462D8BF179AE71F7D702D09DEAC3F1D
+Bridge 148.251.90.59:7510 019F727CA6DCA6CA5C90B55E477B7D87981E75BC
+Bridge 195.91.239.8:9001 BA83F62551545655BBEBBFF353A45438D73FD45A
+Bridge 185.165.184.217:6429 64CC94BEC51254E4409AD059192833854CCB95F0
+Bridge 45.55.1.74:8443 6F18FEFBB0CAECD5ABA755312FCCB34FC11A7AB8
+Bridge 95.85.40.163:9001 40057BE9CF76B6C5BDBE713753468BE0A990DE9C

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

@@ -16,10 +16,13 @@ import org.junit.Test;
 
 import java.io.File;
 
+import static junit.framework.Assert.assertEquals;
 import static junit.framework.Assert.assertFalse;
 import static junit.framework.Assert.assertTrue;
 import static org.briarproject.bramble.test.TestUtils.deleteTestDirectory;
+import static org.briarproject.bramble.test.TestUtils.getRandomBytes;
 import static org.briarproject.bramble.test.TestUtils.getTestDirectory;
+import static org.briarproject.bramble.util.StringUtils.toHexString;
 
 public class AndroidAccountManagerTest extends BrambleMockTestCase {
 
@@ -37,8 +40,11 @@ public class AndroidAccountManagerTest extends BrambleMockTestCase {
 	private final Application app;
 	private final ApplicationInfo applicationInfo;
 
+	private final String encryptedKeyHex = toHexString(getRandomBytes(123));
 	private final File testDir = getTestDirectory();
 	private final File keyDir = new File(testDir, "key");
+	private final File keyFile = new File(keyDir, "db.key");
+	private final File keyBackupFile = new File(keyDir, "db.key.bak");
 	private final File dbDir = new File(testDir, "db");
 
 	private AndroidAccountManager accountManager;
@@ -69,12 +75,33 @@ public class AndroidAccountManagerTest extends BrambleMockTestCase {
 		};
 	}
 
+	@Test
+	public void testDbKeyIsMigratedFromPreferencesToFile() {
+		context.checking(new Expectations() {{
+			oneOf(prefs).getString("key", null);
+			will(returnValue(encryptedKeyHex));
+			oneOf(prefs).edit();
+			will(returnValue(editor));
+			oneOf(editor).remove("key");
+			will(returnValue(editor));
+			oneOf(editor).commit();
+			will(returnValue(true));
+		}});
+
+		assertFalse(keyFile.exists());
+		assertFalse(keyBackupFile.exists());
+
+		assertEquals(encryptedKeyHex,
+				accountManager.loadEncryptedDatabaseKey());
+
+		assertTrue(keyFile.exists());
+		assertTrue(keyBackupFile.exists());
+	}
+
 	@Test
 	public void testDeleteAccountClearsSharedPrefsAndDeletesFiles()
 			throws Exception {
-		// Directories 'code_cache', 'lib' and 'shared_prefs' should be spared
+		// Directories 'lib' and 'shared_prefs' should be spared
-		File codeCacheDir = new File(testDir, "code_cache");
-		File codeCacheFile = new File(codeCacheDir, "file");
 		File libDir = new File(testDir, "lib");
 		File libFile = new File(libDir, "file");
 		File sharedPrefsDir = new File(testDir, "shared_prefs");
@@ -85,8 +112,6 @@ public class AndroidAccountManagerTest extends BrambleMockTestCase {
 		// Other directories should be deleted
 		File potatoDir = new File(testDir, ".potato");
 		File potatoFile = new File(potatoDir, "file");
-		File filesDir = new File(testDir, "filesDir");
-		File externalCacheDir = new File(testDir, "externalCacheDir");
 
 		context.checking(new Expectations() {{
 			oneOf(prefs).edit();
@@ -101,20 +126,12 @@ public class AndroidAccountManagerTest extends BrambleMockTestCase {
 			will(returnValue(editor));
 			oneOf(editor).commit();
 			will(returnValue(true));
-			allowing(app).getApplicationInfo();
+			oneOf(app).getApplicationInfo();
 			will(returnValue(applicationInfo));
-			oneOf(app).getFilesDir();
-			will(returnValue(filesDir));
-			oneOf(app).getCacheDir();
-			will(returnValue(cacheDir));
-			oneOf(app).getExternalCacheDir();
-			will(returnValue(externalCacheDir));
 		}});
 
 		assertTrue(dbDir.mkdirs());
 		assertTrue(keyDir.mkdirs());
-		assertTrue(codeCacheDir.mkdirs());
-		assertTrue(codeCacheFile.createNewFile());
 		assertTrue(libDir.mkdirs());
 		assertTrue(libFile.createNewFile());
 		assertTrue(sharedPrefsDir.mkdirs());
@@ -123,15 +140,11 @@ public class AndroidAccountManagerTest extends BrambleMockTestCase {
 		assertTrue(cacheFile.createNewFile());
 		assertTrue(potatoDir.mkdirs());
 		assertTrue(potatoFile.createNewFile());
-		assertTrue(filesDir.mkdirs());
-		assertTrue(externalCacheDir.mkdirs());
 
 		accountManager.deleteAccount();
 
 		assertFalse(dbDir.exists());
 		assertFalse(keyDir.exists());
-		assertTrue(codeCacheDir.exists());
-		assertTrue(codeCacheFile.exists());
 		assertTrue(libDir.exists());
 		assertTrue(libFile.exists());
 		assertTrue(sharedPrefsDir.exists());
@@ -140,8 +153,6 @@ public class AndroidAccountManagerTest extends BrambleMockTestCase {
 		assertFalse(cacheFile.exists());
 		assertFalse(potatoDir.exists());
 		assertFalse(potatoFile.exists());
-		assertFalse(filesDir.exists());
-		assertFalse(externalCacheDir.exists());
 	}
 
 	@After

bramble-android/witness.gradle

@@ -1,103 +0,0 @@
-dependencyVerification {
-    verify = [
-        'cglib:cglib:3.2.0:cglib-3.2.0.jar:adb13bab79712ad6bdf1bd59f2a3918018a8016e722e8a357065afb9e6690861',
-        'com.android.tools.analytics-library:protos:26.5.1:protos-26.5.1.jar:8dde1130725461fe827f2a343d353f2b51e8870661fc860d7d5ebddb097ead4e',
-        'com.android.tools.analytics-library:shared:26.5.1:shared-26.5.1.jar:ccc2f3b00ec17b11401610ba68553544fc8fc517120e84439ac6eb86b875e18d',
-        'com.android.tools.analytics-library:tracker:26.5.1:tracker-26.5.1.jar:3a76984c0fe2e847ca7a8b35b4780ef0447a9d1666946cb8e60466318e0ab5ae',
-        'com.android.tools.build:aapt2-proto:0.4.0:aapt2-proto-0.4.0.jar:fac0435e08898f89eeeb9ca236bea707155ff816c12205ced285ad53604133ca',
-        'com.android.tools.build:apksig:3.5.1:apksig-3.5.1.jar:1fd33e7f009a2a0da766cfeec4211a09f548034b015c289a66d75dd8a9302f4a',
-        'com.android.tools.build:apkzlib:3.5.1:apkzlib-3.5.1.jar:9f330167cbe973b7db407692f74f4f6453b7ffa5f2048934b06280c2ceee60fa',
-        'com.android.tools.build:builder-model:3.5.1:builder-model-3.5.1.jar:39ea3c82b76b6e0c9f9fa88d93e0edc1dd4a0f1dfae0ef6fbf2d451da47e5450',
-        'com.android.tools.build:builder-test-api:3.5.1:builder-test-api-3.5.1.jar:a1b59305584cbcaa078fdc9cfb80871012755b822dd32e8da19add6f7bbcb762',
-        'com.android.tools.build:builder:3.5.1:builder-3.5.1.jar:e3a8d382434c5f60990730c4719fc814e85a898a33a1e96c1df8d627d3c6eea6',
-        'com.android.tools.build:gradle-api:3.5.1:gradle-api-3.5.1.jar:be9b41859bace11998f66b04ed944f87e413f3ad6da3c4665587699da125addc',
-        'com.android.tools.build:manifest-merger:26.5.1:manifest-merger-26.5.1.jar:dcad9ecb967251f4d750f55a4204a2b400e8fbfe5cb930a1d0d5dbe10ae8bdfc',
-        'com.android.tools.ddms:ddmlib:26.5.1:ddmlib-26.5.1.jar:b081aef2a4ed3f4d47cae4cdb128469735f25a114e026d37123bf9ffdec742a8',
-        'com.android.tools.external.com-intellij:intellij-core:26.5.1:intellij-core-26.5.1.jar:20eced30adc124805bd93488d9cd9d3e33e6bf7b48e9fe5a703d4983f894d450',
-        'com.android.tools.external.com-intellij:kotlin-compiler:26.5.1:kotlin-compiler-26.5.1.jar:5aed762dd54875b77ae7018d97c05756ff0c5b9fd02ec595dd396ccd14cc22cb',
-        'com.android.tools.external.org-jetbrains:uast:26.5.1:uast-26.5.1.jar:4bc8653d6c0943f40fee963a149e36c6baa45683d2530968a13f5007e3c40740',
-        'com.android.tools.layoutlib:layoutlib-api:26.5.1:layoutlib-api-26.5.1.jar:88732f11396c427273e515d23042e35633f4fe4295528a99b866aa2adf0efd9c',
-        'com.android.tools.lint:lint-api:26.5.1:lint-api-26.5.1.jar:ec33fcd72bfaf70dd841e03fbfd93f109c2e575aec146067c606689c3972f0de',
-        'com.android.tools.lint:lint-checks:26.5.1:lint-checks-26.5.1.jar:a1b9607d484aaae7a71dcecdc76f8003d8239af226c776894a2cf63f9e6c60d7',
-        'com.android.tools.lint:lint-gradle-api:26.5.1:lint-gradle-api-26.5.1.jar:82453fd98a8394cc84ed995c04d2cd744abd1d6589403427ba7eef53115406f3',
-        'com.android.tools.lint:lint-gradle:26.5.1:lint-gradle-26.5.1.jar:59465b56cf7db77c656d5f8195d721c3d48b6bdd0502d774de335bfe4baff00b',
-        'com.android.tools.lint:lint:26.5.1:lint-26.5.1.jar:336e4b04ec6f8b0f25879131b7a7862d77df83a1879ee5b71be26128755f8e2e',
-        'com.android.tools:annotations:26.5.1:annotations-26.5.1.jar:2c43c82f8c59d8f7a61e3239e1a2dc9f69dc342ec09af9b7c9f69b25337c0b6e',
-        'com.android.tools:common:26.5.1:common-26.5.1.jar:eccfa54486ed54c4e3123cc42195d023bd0dd21bcd2f0e4868e8c6fc70f8ef6b',
-        'com.android.tools:dvlib:26.5.1:dvlib-26.5.1.jar:46f93ad498b4756e7d867d2fe38c38890a80e7407a4ae459e4a8c8d5c5aeacfe',
-        'com.android.tools:repository:26.5.1:repository-26.5.1.jar:2b3ee791aa4c3e8ce60498c161a27ca7228816fc630eed4d9f25f2f36a106dce',
-        'com.android.tools:sdk-common:26.5.1:sdk-common-26.5.1.jar:365f749676c3574676fd465177c8a492f340816db2b520d6ed114d3b6e77bea7',
-        'com.android.tools:sdklib:26.5.1:sdklib-26.5.1.jar:007da104afb27c8c682a1628023fe9ec438249c8d15ef0fd6624c5bb8e23b696',
-        '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.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',
-        'com.google.guava:failureaccess:1.0.1:failureaccess-1.0.1.jar:a171ee4c734dd2da837e4b16be9df4661afab72a41adaf31eb84dfdaf936ca26',
-        'com.google.guava:guava:27.0.1-jre:guava-27.0.1-jre.jar:e1c814fd04492a27c38e0317eabeaa1b3e950ec8010239e400fe90ad6c9107b4',
-        '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.google.jimfs:jimfs:1.1:jimfs-1.1.jar:c4828e28d7c0a930af9387510b3bada7daa5c04d7c25a75c7b8b081f1c257ddd',
-        'com.google.protobuf:protobuf-java:3.4.0:protobuf-java-3.4.0.jar:dce7e66b32456a1b1198da0caff3a8acb71548658391e798c79369241e6490a4',
-        '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: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:2.21:istack-commons-runtime-2.21.jar:c33e67a0807095f02a0e2da139412dd7c4f9cc1a4c054b3e434f96831ba950f4',
-        'com.sun.xml.fastinfoset:FastInfoset:1.2.13:FastInfoset-1.2.13.jar:27a77db909f3c2833c0b1a37c55af1db06045118ad2eed96ce567b6632bce038',
-        'commons-codec:commons-codec:1.10:commons-codec-1.10.jar:4241dfa94e711d435f29a4604a3e2de5c4aa3c165e23bd066be6fc1fc4309569',
-        'commons-logging:commons-logging:1.2:commons-logging-1.2.jar:daddea1ea0be0f56978ab3006b8ac92834afeefbd9b7e4e6316fca57df0fa636',
-        'it.unimi.dsi:fastutil:7.2.0:fastutil-7.2.0.jar:74fa208043740642f7e6eb09faba15965218ad2f50ce3020efb100136e4b591c',
-        '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:2.2.12-b140109.1041:jaxb-api-2.2.12-b140109.1041.jar:b5e60cd8b7b5ff01ce4a74c5dd008f4fbd14ced3495d0b47b85cfedc182211f2',
-        'junit:junit:4.12:junit-4.12.jar:59721f0805e223d84b90677887d9ff567dc534d7c502ca903c0c2b17f05c116a',
-        '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.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:0.0.11-2:obfs4proxy-android-0.0.11-2.zip:57e55cbe87aa2aac210fdbb6cd8cdeafe15f825406a08ebf77a8b787aa2c6a8a',
-        'org.briarproject:tor-android:0.3.5.10:tor-android-0.3.5.10.zip:edd83bf557fcff2105eaa0bdb3f607a6852ebe7360920929ae3039dd5f4774c5',
-        '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.groovy:groovy-all:2.4.15:groovy-all-2.4.15.jar:51d6c4e71782e85674239189499854359d380fb75e1a703756e3aaa5b98a5af0',
-        'org.codehaus.mojo:animal-sniffer-annotations:1.17:animal-sniffer-annotations-1.17.jar:92654f493ecfec52082e76354f0ebf87648dc3d5cec2e3c3cdb947c016747a53',
-        'org.glassfish.jaxb:jaxb-core:2.2.11:jaxb-core-2.2.11.jar:37bcaee8ebb04362c8352a5bf6221b86967ecdab5164c696b10b9a2bb587b2aa',
-        'org.glassfish.jaxb:jaxb-runtime:2.2.11:jaxb-runtime-2.2.11.jar:a874f2351cfba8e2946be3002d10c18a6da8f21b52ba2acf52f2b85d5520ed70',
-        'org.glassfish.jaxb:txw2:2.2.11:txw2-2.2.11.jar:272a3ccad45a4511351920cd2a8633c53cab8d5220c7a92954da5526bb5eafea',
-        '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.jetbrains.kotlin:kotlin-reflect:1.3.50:kotlin-reflect-1.3.50.jar:64583199ea5a54aefd1bd1595288925f784226ee562d1dd279011c6075b3d7a4',
-        'org.jetbrains.kotlin:kotlin-stdlib-common:1.3.50:kotlin-stdlib-common-1.3.50.jar:8ce678e88e4ba018b66dacecf952471e4d7dfee156a8a819760a5a5ff29d323c',
-        'org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.50:kotlin-stdlib-jdk7-1.3.50.jar:9a026639e76212f8d57b86d55b075394c2e009f1979110751d34c05c5f75d57b',
-        'org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.50:kotlin-stdlib-jdk8-1.3.50.jar:1b351fb6e09c14b55525c74c1f4cf48942eae43c348b7bc764a5e6e423d4da0c',
-        'org.jetbrains.kotlin:kotlin-stdlib:1.3.50:kotlin-stdlib-1.3.50.jar:e6f05746ee0366d0b52825a090fac474dcf44082c9083bbb205bd16976488d6c',
-        '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.jvnet.staxex:stax-ex:1.7.7:stax-ex-1.7.7.jar:a31ff7d77163c0deb09e7fee59ad35ae44c2cee2cc8552a116ccd1583d813fb4',
-        'org.objenesis:objenesis:2.1:objenesis-2.1.jar:c74330cc6b806c804fd37e74487b4fe5d7c2750c5e15fbc6efa13bdee1bdef80',
-        'org.ow2.asm:asm-analysis:6.0:asm-analysis-6.0.jar:2f1a6387219c3a6cc4856481f221b03bd9f2408a326d416af09af5d6f608c1f4',
-        'org.ow2.asm:asm-commons:6.0:asm-commons-6.0.jar:f1bce5c648a96a017bdcd01fe5d59af9845297fd7b79b81c015a6fbbd9719abf',
-        'org.ow2.asm:asm-tree:6.0:asm-tree-6.0.jar:887998fb69727c8759e4d253f856822801e33f9fd4caa566b3ac58ee92106215',
-        'org.ow2.asm:asm-util:6.0:asm-util-6.0.jar:356afebdb0f870175262e5188f8709a3b17aa2a5a6a4b0340b04d4b449bca5f6',
-        'org.ow2.asm:asm:5.0.4:asm-5.0.4.jar:896618ed8ae62702521a78bc7be42b7c491a08e6920a15f89a3ecdec31e9a220',
-        'org.ow2.asm:asm:6.0:asm-6.0.jar:dd8971c74a4e697899a8e95caae4ea8760ea6c486dc6b97b1795e75760420461',
-    ]
-}

bramble-api/build.gradle

@@ -4,20 +4,46 @@ targetCompatibility = 1.8
 
 apply plugin: 'ru.vyarus.animalsniffer'
 apply plugin: 'witness'
-apply from: 'witness.gradle'
 
 dependencies {
-	implementation "com.google.dagger:dagger:2.24"
+	implementation "com.google.dagger:dagger:2.0.2"
 	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 "org.hamcrest:hamcrest-library:1.3"
+	testImplementation "org.hamcrest:hamcrest-core:1.3"
 
 	signature 'org.codehaus.mojo.signature:java16:1.1@signature'
 }
 
+dependencyVerification {
+	verify = [
+			'cglib:cglib:3.2.0:cglib-3.2.0.jar:adb13bab79712ad6bdf1bd59f2a3918018a8016e722e8a357065afb9e6690861',
+			'com.google.code.findbugs:jsr305:3.0.2:jsr305-3.0.2.jar:766ad2a0783f2687962c8ad74ceecc38a28b9f72a2d085ee438b7813e928d0c7',
+			'com.google.dagger:dagger:2.0.2:dagger-2.0.2.jar:84c0282ed8be73a29e0475d639da030b55dee72369e58dd35ae7d4fe6243dcf9',
+			'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',
+			'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.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',
+	]
+}
+
 // needed to make test output available to bramble-core and briar-core
 configurations {
 	testOutput.extendsFrom(testCompile)

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

@@ -4,8 +4,8 @@ import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.util.StringUtils;
 
 import java.util.Arrays;
+import java.util.Comparator;
 
-import javax.annotation.Nullable;
 import javax.annotation.concurrent.ThreadSafe;
 
 /**
@@ -15,6 +15,8 @@ import javax.annotation.concurrent.ThreadSafe;
 @NotNullByDefault
 public class Bytes implements Comparable<Bytes> {
 
+	public static final BytesComparator COMPARATOR = new BytesComparator();
+
 	private final byte[] bytes;
 
 	private int hashCode = -1;
@@ -36,13 +38,20 @@ public class Bytes implements Comparable<Bytes> {
 	}
 
 	@Override
-	public boolean equals(@Nullable Object o) {
+	public boolean equals(Object o) {
 		return o instanceof Bytes && Arrays.equals(bytes, ((Bytes) o).bytes);
 	}
 
 	@Override
 	public int compareTo(Bytes other) {
-		return compare(bytes, other.bytes);
+		byte[] aBytes = bytes, bBytes = other.bytes;
+		int length = Math.min(aBytes.length, bBytes.length);
+		for (int i = 0; i < length; i++) {
+			int aUnsigned = aBytes[i] & 0xFF, bUnsigned = bBytes[i] & 0xFF;
+			if (aUnsigned < bUnsigned) return -1;
+			if (aUnsigned > bUnsigned) return 1;
+		}
+		return aBytes.length - bBytes.length;
 	}
 
 	@Override
@@ -51,13 +60,11 @@ public class Bytes implements Comparable<Bytes> {
 				"(" + StringUtils.toHexString(getBytes()) + ")";
 	}
 
-	public static int compare(byte[] a, byte[] b) {
+	public static class BytesComparator implements Comparator<Bytes> {
-		int length = Math.min(a.length, b.length);
+
-		for (int i = 0; i < length; i++) {
+		@Override
-			int aUnsigned = a[i] & 0xFF, bUnsigned = b[i] & 0xFF;
+		public int compare(Bytes a, Bytes b) {
-			if (aUnsigned < bUnsigned) return -1;
+			return a.compareTo(b);
-			if (aUnsigned > bUnsigned) return 1;
 		}
-		return a.length - b.length;
 	}
 }

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

@@ -1,9 +0,0 @@
-package org.briarproject.bramble.api;
-
-/**
- * Interface for specifying which features are enabled in a build.
- */
-public interface FeatureFlags {
-
-	boolean shouldEnableImageAttachments();
-}

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

@@ -1,10 +0,0 @@
-package org.briarproject.bramble.api;
-
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
-@NotNullByDefault
-public interface Nameable {
-
-	String getName();
-
-}

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

@@ -1,26 +0,0 @@
-package org.briarproject.bramble.api;
-
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
-import javax.annotation.concurrent.Immutable;
-
-@Immutable
-@NotNullByDefault
-public class Pair<A, B> {
-
-	private final A first;
-	private final B second;
-
-	public Pair(A first, B second) {
-		this.first = first;
-		this.second = second;
-	}
-
-	public A getFirst() {
-		return first;
-	}
-
-	public B getSecond() {
-		return second;
-	}
-}

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

@@ -1,9 +0,0 @@
-package org.briarproject.bramble.api;
-
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
-@NotNullByDefault
-public interface Predicate<T> {
-
-	boolean test(T t);
-}

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

@@ -38,18 +38,4 @@ public abstract class StringMap extends Hashtable<String, String> {
 	public void putInt(String key, int value) {
 		put(key, String.valueOf(value));
 	}
-
-	public long getLong(String key, long defaultValue) {
-		String s = get(key);
-		if (s == null) return defaultValue;
-		try {
-			return Long.valueOf(s);
-		} catch (NumberFormatException e) {
-			return defaultValue;
-		}
-	}
-
-	public void putLong(String key, long value) {
-		put(key, String.valueOf(value));
-	}
 }

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

@@ -1,18 +1,9 @@
 package org.briarproject.bramble.api;
 
+import java.io.IOException;
+
 /**
- * Thrown when data being parsed uses a protocol or format version that is not
+ * An exception that indicates an unrecoverable version mismatch.
- * supported.
  */
-public class UnsupportedVersionException extends FormatException {
+public class UnsupportedVersionException extends IOException {
-
-	private final boolean tooOld;
-
-	public UnsupportedVersionException(boolean tooOld) {
-		this.tooOld = tooOld;
-	}
-
-	public boolean isTooOld() {
-		return tooOld;
-	}
 }

bramble-api/src/main/java/org/briarproject/bramble/api/account/AccountManager.java

@@ -1,6 +1,5 @@
 package org.briarproject.bramble.api.account;
 
-import org.briarproject.bramble.api.crypto.DecryptionException;
 import org.briarproject.bramble.api.crypto.SecretKey;
 import org.briarproject.bramble.api.identity.IdentityManager;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
@@ -14,8 +13,7 @@ public interface AccountManager {
 	 * Returns true if the manager has the database key. This will be false
 	 * before {@link #createAccount(String, String)} or {@link #signIn(String)}
 	 * has been called, and true after {@link #createAccount(String, String)}
-	 * or {@link #signIn(String)} has returned true, until
+	 * or {@link #signIn(String)} has returned true, until the process exits.
-	 * {@link #deleteAccount()} is called or the process exits.
 	 */
 	boolean hasDatabaseKey();
 
@@ -24,22 +22,25 @@ public interface AccountManager {
 	 * before {@link #createAccount(String, String)} or {@link #signIn(String)}
 	 * has been called, and non-null after
 	 * {@link #createAccount(String, String)} or {@link #signIn(String)} has
-	 * returned true, until {@link #deleteAccount()} is called or the process
+	 * returned true, until the process exits.
-	 * exits.
 	 */
 	@Nullable
 	SecretKey getDatabaseKey();
 
 	/**
-	 * Returns true if the encrypted database key can be loaded from disk.
+	 * Returns true if the encrypted database key can be loaded from disk, and
+	 * the database directory exists and is a directory.
 	 */
 	boolean accountExists();
 
 	/**
 	 * Creates an identity with the given name and registers it with the
 	 * {@link IdentityManager}. Creates a database key, encrypts it with the
-	 * given password and stores it on disk. {@link #accountExists()} will
+	 * given password and stores it on disk.
-	 * return true after this method returns true.
+	 * <p/>
+	 * This method does not create the database directory, so
+	 * {@link #accountExists()} will continue to return false until the
+	 * database directory is created.
 	 */
 	boolean createAccount(String name, String password);
 
@@ -53,19 +54,17 @@ public interface AccountManager {
 	 * Loads the encrypted database key from disk and decrypts it with the
 	 * given password.
 	 *
-	 * @throws DecryptionException If the database key could not be loaded and
+	 * @return true if the database key was successfully loaded and decrypted.
-	 * decrypted.
 	 */
-	void signIn(String password) throws DecryptionException;
+	boolean signIn(String password);
 
 	/**
 	 * Loads the encrypted database key from disk, decrypts it with the old
 	 * password, encrypts it with the new password, and stores it on disk,
 	 * replacing the old key.
 	 *
-	 * @throws DecryptionException If the database key could not be loaded and
+	 * @return true if the database key was successfully loaded, re-encrypted
-	 * decrypted.
+	 * and stored.
 	 */
-	void changePassword(String oldPassword, String newPassword)
+	boolean changePassword(String oldPassword, String newPassword);
-			throws DecryptionException;
 }

bramble-api/src/main/java/org/briarproject/bramble/api/battery/BatteryManager.java

@@ -1,6 +0,0 @@
-package org.briarproject.bramble.api.battery;
-
-public interface BatteryManager {
-
-	boolean isCharging();
-}

bramble-api/src/main/java/org/briarproject/bramble/api/battery/event/BatteryEvent.java

@@ -1,19 +0,0 @@
-package org.briarproject.bramble.api.battery.event;
-
-import org.briarproject.bramble.api.event.Event;
-
-/**
- * An event that is broadcast when the device starts or stops charging.
- */
-public class BatteryEvent extends Event {
-
-	private final boolean charging;
-
-	public BatteryEvent(boolean charging) {
-		this.charging = charging;
-	}
-
-	public boolean isCharging() {
-		return charging;
-	}
-}

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

@@ -9,13 +9,14 @@ import org.briarproject.bramble.api.sync.Group;
 import org.briarproject.bramble.api.sync.InvalidMessageException;
 import org.briarproject.bramble.api.sync.Message;
 import org.briarproject.bramble.api.sync.MessageContext;
-import org.briarproject.bramble.api.sync.validation.MessageValidator;
+import org.briarproject.bramble.api.sync.ValidationManager.MessageValidator;
 import org.briarproject.bramble.api.system.Clock;
 
 import java.util.logging.Logger;
 
 import javax.annotation.concurrent.Immutable;
 
+import static org.briarproject.bramble.api.sync.SyncConstants.MESSAGE_HEADER_LENGTH;
 import static org.briarproject.bramble.api.transport.TransportConstants.MAX_CLOCK_DIFFERENCE;
 
 @Immutable
@@ -48,9 +49,14 @@ public abstract class BdfMessageValidator implements MessageValidator {
 			throw new InvalidMessageException(
 					"Timestamp is too far in the future");
 		}
+		byte[] raw = m.getRaw();
+		if (raw.length <= MESSAGE_HEADER_LENGTH) {
+			throw new InvalidMessageException("Message is too short");
+		}
 		try {
-			BdfList bodyList = clientHelper.toList(m.getBody());
+			BdfList body = clientHelper.toList(raw, MESSAGE_HEADER_LENGTH,
-			BdfMessageContext result = validateMessage(m, g, bodyList);
+					raw.length - MESSAGE_HEADER_LENGTH);
+			BdfMessageContext result = validateMessage(m, g, body);
 			Metadata meta = metadataEncoder.encode(result.getDictionary());
 			return new MessageContext(meta, result.getDependencies());
 		} catch (FormatException e) {

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

@@ -1,8 +1,6 @@
 package org.briarproject.bramble.api.client;
 
 import org.briarproject.bramble.api.FormatException;
-import org.briarproject.bramble.api.crypto.PrivateKey;
-import org.briarproject.bramble.api.crypto.PublicKey;
 import org.briarproject.bramble.api.data.BdfDictionary;
 import org.briarproject.bramble.api.data.BdfList;
 import org.briarproject.bramble.api.db.DbException;
@@ -18,6 +16,8 @@ import org.briarproject.bramble.api.sync.MessageId;
 import java.security.GeneralSecurityException;
 import java.util.Map;
 
+import javax.annotation.Nullable;
+
 @NotNullByDefault
 public interface ClientHelper {
 
@@ -25,22 +25,23 @@ public interface ClientHelper {
 			throws DbException, FormatException;
 
 	void addLocalMessage(Transaction txn, Message m, BdfDictionary metadata,
-			boolean shared, boolean temporary)
+			boolean shared) throws DbException, FormatException;
-			throws DbException, FormatException;
-
-	Message createMessage(GroupId g, long timestamp, byte[] body);
 
 	Message createMessage(GroupId g, long timestamp, BdfList body)
 			throws FormatException;
 
 	Message createMessageForStoringMetadata(GroupId g);
 
+	@Nullable
 	Message getMessage(MessageId m) throws DbException;
 
+	@Nullable
 	Message getMessage(Transaction txn, MessageId m) throws DbException;
 
+	@Nullable
 	BdfList getMessageAsList(MessageId m) throws DbException, FormatException;
 
+	@Nullable
 	BdfList getMessageAsList(Transaction txn, MessageId m) throws DbException,
 			FormatException;
 
@@ -101,18 +102,14 @@ public interface ClientHelper {
 
 	BdfList toList(Author a);
 
-	byte[] sign(String label, BdfList toSign, PrivateKey privateKey)
+	byte[] sign(String label, BdfList toSign, byte[] privateKey)
 			throws FormatException, GeneralSecurityException;
 
 	void verifySignature(byte[] signature, String label, BdfList signed,
-			PublicKey publicKey)
+			byte[] publicKey) throws FormatException, GeneralSecurityException;
-			throws FormatException, GeneralSecurityException;
 
 	Author parseAndValidateAuthor(BdfList author) throws FormatException;
 
-	PublicKey parseAndValidateAgreementPublicKey(byte[] publicKeyBytes)
-			throws FormatException;
-
 	TransportProperties parseAndValidateTransportProperties(
 			BdfDictionary properties) throws FormatException;
 

bramble-api/src/main/java/org/briarproject/bramble/api/connection/ConnectionManager.java

@@ -1,49 +0,0 @@
-package org.briarproject.bramble.api.connection;
-
-import org.briarproject.bramble.api.contact.ContactId;
-import org.briarproject.bramble.api.contact.PendingContactId;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.plugin.TransportConnectionReader;
-import org.briarproject.bramble.api.plugin.TransportConnectionWriter;
-import org.briarproject.bramble.api.plugin.TransportId;
-import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
-
-@NotNullByDefault
-public interface ConnectionManager {
-
-	/**
-	 * Manages an incoming connection from a contact over a simplex transport.
-	 */
-	void manageIncomingConnection(TransportId t, TransportConnectionReader r);
-
-	/**
-	 * Manages an incoming connection from a contact over a duplex transport.
-	 */
-	void manageIncomingConnection(TransportId t, DuplexTransportConnection d);
-
-	/**
-	 * Manages an incoming handshake connection from a pending contact over a
-	 * duplex transport.
-	 */
-	void manageIncomingConnection(PendingContactId p, TransportId t,
-			DuplexTransportConnection d);
-
-	/**
-	 * Manages an outgoing connection to a contact over a simplex transport.
-	 */
-	void manageOutgoingConnection(ContactId c, TransportId t,
-			TransportConnectionWriter w);
-
-	/**
-	 * Manages an outgoing connection to a contact over a duplex transport.
-	 */
-	void manageOutgoingConnection(ContactId c, TransportId t,
-			DuplexTransportConnection d);
-
-	/**
-	 * Manages an outgoing handshake connection to a pending contact over a
-	 * duplex transport.
-	 */
-	void manageOutgoingConnection(PendingContactId p, TransportId t,
-			DuplexTransportConnection d);
-}

bramble-api/src/main/java/org/briarproject/bramble/api/connection/ConnectionRegistry.java

@@ -1,130 +0,0 @@
-package org.briarproject.bramble.api.connection;
-
-import org.briarproject.bramble.api.contact.ContactId;
-import org.briarproject.bramble.api.contact.PendingContactId;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.plugin.PluginConfig;
-import org.briarproject.bramble.api.plugin.TransportId;
-import org.briarproject.bramble.api.plugin.event.ConnectionClosedEvent;
-import org.briarproject.bramble.api.plugin.event.ConnectionOpenedEvent;
-import org.briarproject.bramble.api.plugin.event.ContactConnectedEvent;
-import org.briarproject.bramble.api.plugin.event.ContactDisconnectedEvent;
-import org.briarproject.bramble.api.rendezvous.event.RendezvousConnectionClosedEvent;
-import org.briarproject.bramble.api.rendezvous.event.RendezvousConnectionOpenedEvent;
-import org.briarproject.bramble.api.sync.Priority;
-
-import java.util.Collection;
-
-/**
- * Keeps track of which contacts are currently connected by which transports.
- */
-@NotNullByDefault
-public interface ConnectionRegistry {
-
-	/**
-	 * Registers an incoming connection from the given contact over the given
-	 * transport. The connection's {@link Priority priority} can be set later
-	 * via {@link #setPriority(ContactId, TransportId, InterruptibleConnection,
-	 * Priority)} if a priority record is received from the contact.
-	 * <p>
-	 * Broadcasts {@link ConnectionOpenedEvent}. Also broadcasts
-	 * {@link ContactConnectedEvent} if this is the only connection with the
-	 * contact.
-	 */
-	void registerIncomingConnection(ContactId c, TransportId t,
-			InterruptibleConnection conn);
-
-	/**
-	 * Registers an outgoing connection to the given contact over the given
-	 * transport.
-	 * <p>
-	 * Broadcasts {@link ConnectionOpenedEvent}. Also broadcasts
-	 * {@link ContactConnectedEvent} if this is the only connection with the
-	 * contact.
-	 * <p>
-	 * If the registry has any "better" connections with the given contact, the
-	 * given connection will be interrupted. If the registry has any "worse"
-	 * connections with the given contact, those connections will be
-	 * interrupted.
-	 * <p>
-	 * Connection A is considered "better" than connection B if both
-	 * connections have had their priorities set, and either A's transport is
-	 * {@link PluginConfig#getTransportPreferences() preferred} to B's, or
-	 * they use the same transport and A has higher {@link Priority priority}
-	 * than B.
-	 * <p>
-	 * For backward compatibility, connections without priorities are not
-	 * considered better or worse than other connections.
-	 */
-	void registerOutgoingConnection(ContactId c, TransportId t,
-			InterruptibleConnection conn, Priority priority);
-
-	/**
-	 * Unregisters a connection with the given contact over the given transport.
-	 * <p>
-	 * Broadcasts {@link ConnectionClosedEvent}. Also broadcasts
-	 * {@link ContactDisconnectedEvent} if this is the only connection with
-	 * the contact.
-	 */
-	void unregisterConnection(ContactId c, TransportId t,
-			InterruptibleConnection conn, boolean incoming, boolean exception);
-
-	/**
-	 * Sets the {@link Priority priority} of a connection that was previously
-	 * registered via {@link #registerIncomingConnection(ContactId, TransportId,
-	 * InterruptibleConnection)}.
-	 * <p>
-	 * If the registry has any "better" connections with the given contact, the
-	 * given connection will be interrupted. If the registry has any "worse"
-	 * connections with the given contact, those connections will be
-	 * interrupted.
-	 * <p>
-	 * Connection A is considered "better" than connection B if both
-	 * connections have had their priorities set, and either A's transport is
-	 * {@link PluginConfig#getTransportPreferences() preferred} to B's, or
-	 * they use the same transport and A has higher {@link Priority priority}
-	 * than B.
-	 * <p>
-	 * For backward compatibility, connections without priorities are not
-	 * considered better or worse than other connections.
-	 */
-	void setPriority(ContactId c, TransportId t, InterruptibleConnection conn,
-			Priority priority);
-
-	/**
-	 * Returns any contacts that are connected via the given transport.
-	 */
-	Collection<ContactId> getConnectedContacts(TransportId t);
-
-	/**
-	 * Returns any contacts that are connected via the given transport or any
-	 * {@link PluginConfig#getTransportPreferences() better} transport.
-	 */
-	Collection<ContactId> getConnectedOrBetterContacts(TransportId t);
-
-	/**
-	 * Returns true if the given contact is connected via the given transport.
-	 */
-	boolean isConnected(ContactId c, TransportId t);
-
-	/**
-	 * Returns true if the given contact is connected via any transport.
-	 */
-	boolean isConnected(ContactId c);
-
-	/**
-	 * Registers a connection with the given pending contact. Broadcasts
-	 * {@link RendezvousConnectionOpenedEvent} if this is the only connection
-	 * with the pending contact.
-	 *
-	 * @return True if this is the only connection with the pending contact,
-	 * false if it is redundant and should be closed
-	 */
-	boolean registerConnection(PendingContactId p);
-
-	/**
-	 * Unregisters a connection with the given pending contact. Broadcasts
-	 * {@link RendezvousConnectionClosedEvent}.
-	 */
-	void unregisterConnection(PendingContactId p, boolean success);
-}

bramble-api/src/main/java/org/briarproject/bramble/api/connection/InterruptibleConnection.java

@@ -1,19 +0,0 @@
-package org.briarproject.bramble.api.connection;
-
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
-/**
- * A duplex sync connection that can be closed by interrupting its outgoing
- * sync session.
- */
-@NotNullByDefault
-public interface InterruptibleConnection {
-
-	/**
-	 * Interrupts the connection's outgoing sync session. If the underlying
-	 * transport connection is alive and the remote peer is cooperative, this
-	 * should result in both sync sessions ending and the connection being
-	 * cleanly closed.
-	 */
-	void interruptOutgoingSession();
-}

bramble-api/src/main/java/org/briarproject/bramble/api/contact/Contact.java

@@ -1,16 +1,11 @@
 package org.briarproject.bramble.api.contact;
 
-import org.briarproject.bramble.api.crypto.PublicKey;
 import org.briarproject.bramble.api.identity.Author;
 import org.briarproject.bramble.api.identity.AuthorId;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 
-import javax.annotation.Nullable;
 import javax.annotation.concurrent.Immutable;
 
-import static org.briarproject.bramble.api.identity.AuthorConstants.MAX_AUTHOR_NAME_LENGTH;
-import static org.briarproject.bramble.util.StringUtils.toUtf8;
-
 @Immutable
 @NotNullByDefault
 public class Contact {
@@ -18,26 +13,15 @@ public class Contact {
 	private final ContactId id;
 	private final Author author;
 	private final AuthorId localAuthorId;
-	@Nullable
+	private final boolean verified, active;
-	private final String alias;
-	@Nullable
-	private final PublicKey handshakePublicKey;
-	private final boolean verified;
 
 	public Contact(ContactId id, Author author, AuthorId localAuthorId,
-			@Nullable String alias, @Nullable PublicKey handshakePublicKey,
+			boolean verified, boolean active) {
-			boolean verified) {
-		if (alias != null) {
-			int aliasLength = toUtf8(alias).length;
-			if (aliasLength == 0 || aliasLength > MAX_AUTHOR_NAME_LENGTH)
-				throw new IllegalArgumentException();
-		}
 		this.id = id;
 		this.author = author;
 		this.localAuthorId = localAuthorId;
-		this.alias = alias;
-		this.handshakePublicKey = handshakePublicKey;
 		this.verified = verified;
+		this.active = active;
 	}
 
 	public ContactId getId() {
@@ -52,20 +36,14 @@ public class Contact {
 		return localAuthorId;
 	}
 
-	@Nullable
-	public String getAlias() {
-		return alias;
-	}
-
-	@Nullable
-	public PublicKey getHandshakePublicKey() {
-		return handshakePublicKey;
-	}
-
 	public boolean isVerified() {
 		return verified;
 	}
 
+	public boolean isActive() {
+		return active;
+	}
+
 	@Override
 	public int hashCode() {
 		return id.hashCode();

bramble-api/src/main/java/org/briarproject/bramble/api/contact/ContactExchangeListener.java

@@ -0,0 +1,20 @@
+package org.briarproject.bramble.api.contact;
+
+import org.briarproject.bramble.api.identity.Author;
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+@NotNullByDefault
+public interface ContactExchangeListener {
+
+	void contactExchangeSucceeded(Author remoteAuthor);
+
+	/**
+	 * The exchange failed because the contact already exists.
+	 */
+	void duplicateContact(Author remoteAuthor);
+
+	/**
+	 * A general failure.
+	 */
+	void contactExchangeFailed();
+}

bramble-api/src/main/java/org/briarproject/bramble/api/contact/ContactExchangeManager.java

@@ -1,37 +0,0 @@
-package org.briarproject.bramble.api.contact;
-
-import org.briarproject.bramble.api.crypto.SecretKey;
-import org.briarproject.bramble.api.db.ContactExistsException;
-import org.briarproject.bramble.api.db.DbException;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
-
-import java.io.IOException;
-
-@NotNullByDefault
-public interface ContactExchangeManager {
-
-	/**
-	 * Exchanges contact information with a remote peer and adds the peer
-	 * as a contact.
-	 *
-	 * @param alice Whether the local peer takes the role of Alice
-	 * @return The newly added contact
-	 * @throws ContactExistsException If the contact already exists
-	 */
-	Contact exchangeContacts(DuplexTransportConnection conn,
-			SecretKey masterKey, boolean alice, boolean verified)
-			throws IOException, DbException;
-
-	/**
-	 * Exchanges contact information with a remote peer and adds the peer
-	 * as a contact, replacing the given pending contact.
-	 *
-	 * @param alice Whether the local peer takes the role of Alice
-	 * @return The newly added contact
-	 * @throws ContactExistsException If the contact already exists
-	 */
-	Contact exchangeContacts(PendingContactId p, DuplexTransportConnection conn,
-			SecretKey masterKey, boolean alice, boolean verified)
-			throws IOException, DbException;
-}

bramble-api/src/main/java/org/briarproject/bramble/api/contact/ContactExchangeTask.java

@@ -0,0 +1,48 @@
+package org.briarproject.bramble.api.contact;
+
+import org.briarproject.bramble.api.crypto.SecretKey;
+import org.briarproject.bramble.api.identity.LocalAuthor;
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.api.plugin.TransportId;
+import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
+
+/**
+ * A task for conducting a contact information exchange with a remote peer.
+ */
+@NotNullByDefault
+public interface ContactExchangeTask {
+
+	/**
+	 * The current version of the contact exchange protocol.
+	 */
+	byte PROTOCOL_VERSION = 1;
+
+	/**
+	 * Label for deriving Alice's header key from the master secret.
+	 */
+	String ALICE_KEY_LABEL =
+			"org.briarproject.bramble.contact/ALICE_HEADER_KEY";
+
+	/**
+	 * Label for deriving Bob's header key from the master secret.
+	 */
+	String BOB_KEY_LABEL = "org.briarproject.bramble.contact/BOB_HEADER_KEY";
+
+	/**
+	 * Label for deriving Alice's key binding nonce from the master secret.
+	 */
+	String ALICE_NONCE_LABEL = "org.briarproject.bramble.contact/ALICE_NONCE";
+
+	/**
+	 * Label for deriving Bob's key binding nonce from the master secret.
+	 */
+	String BOB_NONCE_LABEL = "org.briarproject.bramble.contact/BOB_NONCE";
+
+	/**
+	 * Exchanges contact information with a remote peer.
+	 */
+	void startExchange(ContactExchangeListener listener,
+			LocalAuthor localAuthor, SecretKey masterSecret,
+			DuplexTransportConnection conn, TransportId transportId,
+			boolean alice);
+}

bramble-api/src/main/java/org/briarproject/bramble/api/contact/ContactId.java

@@ -2,7 +2,6 @@ package org.briarproject.bramble.api.contact;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 
-import javax.annotation.Nullable;
 import javax.annotation.concurrent.Immutable;
 
 /**
@@ -29,7 +28,7 @@ public class ContactId {
 	}
 
 	@Override
-	public boolean equals(@Nullable Object o) {
+	public boolean equals(Object o) {
 		return o instanceof ContactId && id == ((ContactId) o).id;
 	}
 }

bramble-api/src/main/java/org/briarproject/bramble/api/contact/ContactManager.java

@@ -1,25 +1,15 @@
 package org.briarproject.bramble.api.contact;
 
-import org.briarproject.bramble.api.FormatException;
-import org.briarproject.bramble.api.Pair;
-import org.briarproject.bramble.api.UnsupportedVersionException;
 import org.briarproject.bramble.api.crypto.SecretKey;
-import org.briarproject.bramble.api.db.ContactExistsException;
 import org.briarproject.bramble.api.db.DbException;
-import org.briarproject.bramble.api.db.NoSuchContactException;
-import org.briarproject.bramble.api.db.PendingContactExistsException;
 import org.briarproject.bramble.api.db.Transaction;
 import org.briarproject.bramble.api.identity.Author;
 import org.briarproject.bramble.api.identity.AuthorId;
-import org.briarproject.bramble.api.identity.AuthorInfo;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 
-import java.security.GeneralSecurityException;
 import java.util.Collection;
 
-import javax.annotation.Nullable;
-
 @NotNullByDefault
 public interface ContactManager {
 
@@ -32,152 +22,60 @@ public interface ContactManager {
 
 	/**
 	 * Stores a contact associated with the given local and remote pseudonyms,
-	 * derives and stores rotation mode transport keys for each transport, and
+	 * derives and stores transport keys for each transport, and returns an ID
-	 * returns an ID for the contact.
-	 *
-	 * @param rootKey The root key for a set of rotation mode transport keys
-	 * @param timestamp The timestamp for deriving rotation mode transport
-	 * keys from the root key
-	 * @param alice True if the local party is Alice
-	 * @param verified True if the contact's identity has been verified, which
-	 * is true if the contact was added in person or false if the contact was
-	 * introduced or added remotely
-	 * @param active True if the rotation mode transport keys can be used for
-	 * outgoing streams
-	 */
-	ContactId addContact(Transaction txn, Author remote, AuthorId local,
-			SecretKey rootKey, long timestamp, boolean alice, boolean verified,
-			boolean active) throws DbException;
-
-	/**
-	 * Stores a contact associated with the given local and remote pseudonyms,
-	 * replacing the given pending contact, derives and stores handshake mode
-	 * and rotation mode transport keys for each transport, and returns an ID
 	 * for the contact.
 	 *
-	 * @param rootKey The root key for a set of rotation mode transport keys
+	 * @param alice true if the local party is Alice
-	 * @param timestamp The timestamp for deriving rotation mode transport
-	 * keys from the root key
-	 * @param alice True if the local party is Alice
-	 * @param verified True if the contact's identity has been verified, which
-	 * is true if the contact was added in person or false if the contact was
-	 * introduced or added remotely
-	 * @param active True if the rotation mode transport keys can be used for
-	 * outgoing streams
-	 * @throws GeneralSecurityException If the pending contact's handshake
-	 * public key is invalid
 	 */
-	ContactId addContact(Transaction txn, PendingContactId p, Author remote,
+	ContactId addContact(Transaction txn, Author remote, AuthorId local,
-			AuthorId local, SecretKey rootKey, long timestamp, boolean alice,
+			SecretKey master, long timestamp, boolean alice, boolean verified,
-			boolean verified, boolean active)
+			boolean active) throws DbException;
-			throws DbException, GeneralSecurityException;
 
 	/**
 	 * Stores a contact associated with the given local and remote pseudonyms
 	 * and returns an ID for the contact.
-	 *
-	 * @param verified True if the contact's identity has been verified, which
-	 * is true if the contact was added in person or false if the contact was
-	 * introduced or added remotely
 	 */
 	ContactId addContact(Transaction txn, Author remote, AuthorId local,
-			boolean verified) throws DbException;
+			boolean verified, boolean active) throws DbException;
 
 	/**
 	 * Stores a contact associated with the given local and remote pseudonyms,
-	 * derives and stores rotation mode transport keys for each transport, and
+	 * derives and stores transport keys for each transport, and returns an ID
-	 * returns an ID for the contact.
+	 * for the contact.
 	 *
-	 * @param rootKey The root key for a set of rotation mode transport keys
+	 * @param alice true if the local party is Alice
-	 * @param timestamp The timestamp for deriving rotation mode transport
-	 * keys from the root key
-	 * @param alice True if the local party is Alice
-	 * @param verified True if the contact's identity has been verified, which
-	 * is true if the contact was added in person or false if the contact was
-	 * introduced or added remotely
-	 * @param active True if the rotation mode transport keys can be used for
-	 * outgoing streams
 	 */
-	ContactId addContact(Author remote, AuthorId local, SecretKey rootKey,
+	ContactId addContact(Author remote, AuthorId local, SecretKey master,
 			long timestamp, boolean alice, boolean verified, boolean active)
 			throws DbException;
 
-	/**
-	 * Returns the handshake link that needs to be sent to a contact we want
-	 * to add.
-	 */
-	String getHandshakeLink() throws DbException;
-
-	/**
-	 * Creates a {@link PendingContact} from the given handshake link and
-	 * alias, adds it to the database and returns it.
-	 *
-	 * @param link The handshake link received from the pending contact
-	 * @param alias The alias the user has given this pending contact
-	 * @throws UnsupportedVersionException If the link uses a format version
-	 * that is not supported
-	 * @throws FormatException If the link is invalid
-	 * @throws GeneralSecurityException If the pending contact's handshake
-	 * public key is invalid
-	 * @throws ContactExistsException If a contact with the same handshake
-	 * public key already exists
-	 * @throws PendingContactExistsException If a pending contact with the same
-	 * handshake public key already exists
-	 */
-	PendingContact addPendingContact(String link, String alias)
-			throws DbException, FormatException, GeneralSecurityException,
-			ContactExistsException, PendingContactExistsException;
-
-	/**
-	 * Returns the pending contact with the given ID.
-	 */
-	PendingContact getPendingContact(Transaction txn, PendingContactId p)
-			throws DbException;
-
-	/**
-	 * Returns a list of {@link PendingContact PendingContacts} and their
-	 * {@link PendingContactState states}.
-	 */
-	Collection<Pair<PendingContact, PendingContactState>> getPendingContacts()
-			throws DbException;
-
-	/**
-	 * Removes a {@link PendingContact}.
-	 */
-	void removePendingContact(PendingContactId p) throws DbException;
-
 	/**
 	 * Returns the contact with the given ID.
 	 */
 	Contact getContact(ContactId c) throws DbException;
 
 	/**
-	 * Returns the contact with the given ID.
+	 * Returns the contact with the given remoteAuthorId
-	 */
+	 * that was added by the LocalAuthor with the given localAuthorId
-	Contact getContact(Transaction txn, ContactId c) throws DbException;
-
-	/**
-	 * Returns the contact with the given {@code remoteAuthorId}
-	 * that belongs to the local pseudonym with the given {@code localAuthorId}.
 	 *
-	 * @throws NoSuchContactException If the contact is not in the database
+	 * @throws org.briarproject.bramble.api.db.NoSuchContactException
 	 */
 	Contact getContact(AuthorId remoteAuthorId, AuthorId localAuthorId)
 			throws DbException;
 
 	/**
-	 * Returns the contact with the given {@code remoteAuthorId}
+	 * Returns the contact with the given remoteAuthorId
-	 * that belongs to the local pseudonym with the given {@code localAuthorId}.
+	 * that was added by the LocalAuthor with the given localAuthorId
 	 *
-	 * @throws NoSuchContactException If the contact is not in the database
+	 * @throws org.briarproject.bramble.api.db.NoSuchContactException
 	 */
 	Contact getContact(Transaction txn, AuthorId remoteAuthorId,
 			AuthorId localAuthorId) throws DbException;
 
 	/**
-	 * Returns all contacts.
+	 * Returns all active contacts.
 	 */
-	Collection<Contact> getContacts() throws DbException;
+	Collection<Contact> getActiveContacts() throws DbException;
 
 	/**
 	 * Removes a contact and all associated state.
@@ -190,57 +88,27 @@ public interface ContactManager {
 	void removeContact(Transaction txn, ContactId c) throws DbException;
 
 	/**
-	 * Sets an alias for the contact or unsets it if {@code alias} is null.
+	 * Marks a contact as active or inactive.
 	 */
-	void setContactAlias(Transaction txn, ContactId c, @Nullable String alias)
+	void setContactActive(Transaction txn, ContactId c, boolean active)
 			throws DbException;
 
 	/**
-	 * Sets an alias for the contact or unsets it if {@code alias} is null.
+	 * Return true if a contact with this name and public key already exists
-	 */
-	void setContactAlias(ContactId c, @Nullable String alias)
-			throws DbException;
-
-	/**
-	 * Returns true if a contact with this {@code remoteAuthorId} belongs to
-	 * the local pseudonym with this {@code localAuthorId}.
 	 */
 	boolean contactExists(Transaction txn, AuthorId remoteAuthorId,
 			AuthorId localAuthorId) throws DbException;
 
 	/**
-	 * Returns true if a contact with this {@code remoteAuthorId} belongs to
+	 * Return true if a contact with this name and public key already exists
-	 * the local pseudonym with this {@code localAuthorId}.
 	 */
 	boolean contactExists(AuthorId remoteAuthorId, AuthorId localAuthorId)
 			throws DbException;
 
-	/**
-	 * Returns the {@link AuthorInfo} for the given author.
-	 */
-	AuthorInfo getAuthorInfo(AuthorId a) throws DbException;
-
-	/**
-	 * Returns the {@link AuthorInfo} for the given author.
-	 */
-	AuthorInfo getAuthorInfo(Transaction txn, AuthorId a) throws DbException;
-
 	interface ContactHook {
 
-		/**
-		 * Called when a contact is being added.
-		 *
-		 * @param txn A read-write transaction
-		 * @param c The contact that is being added
-		 */
 		void addingContact(Transaction txn, Contact c) throws DbException;
 
-		/**
-		 * Called when a contact is being removed
-		 *
-		 * @param txn A read-write transaction
-		 * @param c The contact that is being removed
-		 */
 		void removingContact(Transaction txn, Contact c) throws DbException;
 	}
 }

bramble-api/src/main/java/org/briarproject/bramble/api/contact/HandshakeLinkConstants.java

@@ -1,34 +0,0 @@
-package org.briarproject.bramble.api.contact;
-
-import java.util.regex.Pattern;
-
-public interface HandshakeLinkConstants {
-
-	/**
-	 * The current version of the handshake link format.
-	 */
-	int FORMAT_VERSION = 0;
-
-	/**
-	 * The length of a base32-encoded handshake link in bytes, excluding the
-	 * 'briar://' prefix.
-	 */
-	int BASE32_LINK_BYTES = 53;
-
-	/**
-	 * The length of a raw handshake link in bytes, before base32 encoding.
-	 */
-	int RAW_LINK_BYTES = 33;
-
-	/**
-	 * Regular expression for matching handshake links, including or excluding
-	 * the 'briar://' prefix.
-	 */
-	Pattern LINK_REGEX =
-			Pattern.compile("(briar://)?([a-z2-7]{" + BASE32_LINK_BYTES + "})");
-
-	/**
-	 * Label for hashing handshake public keys to calculate their identifiers.
-	 */
-	String ID_LABEL = "org.briarproject.bramble/HANDSHAKE_KEY_ID";
-}

bramble-api/src/main/java/org/briarproject/bramble/api/contact/HandshakeManager.java

@@ -1,45 +0,0 @@
-package org.briarproject.bramble.api.contact;
-
-import org.briarproject.bramble.api.crypto.SecretKey;
-import org.briarproject.bramble.api.db.DbException;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.transport.StreamWriter;
-
-import java.io.IOException;
-import java.io.InputStream;
-
-@NotNullByDefault
-public interface HandshakeManager {
-
-	/**
-	 * Handshakes with the given pending contact. Returns an ephemeral master
-	 * key authenticated with both parties' handshake key pairs and a flag
-	 * indicating whether the local peer is Alice or Bob.
-	 *
-	 * @param in An incoming stream for the handshake, which must be secured in
-	 * handshake mode
-	 * @param out An outgoing stream for the handshake, which must be secured
-	 * in handshake mode
-	 */
-	HandshakeResult handshake(PendingContactId p, InputStream in,
-			StreamWriter out) throws DbException, IOException;
-
-	class HandshakeResult {
-
-		private final SecretKey masterKey;
-		private final boolean alice;
-
-		public HandshakeResult(SecretKey masterKey, boolean alice) {
-			this.masterKey = masterKey;
-			this.alice = alice;
-		}
-
-		public SecretKey getMasterKey() {
-			return masterKey;
-		}
-
-		public boolean isAlice() {
-			return alice;
-		}
-	}
-}

bramble-api/src/main/java/org/briarproject/bramble/api/contact/PendingContact.java

@@ -1,51 +0,0 @@
-package org.briarproject.bramble.api.contact;
-
-import org.briarproject.bramble.api.crypto.PublicKey;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
-import javax.annotation.concurrent.Immutable;
-
-@Immutable
-@NotNullByDefault
-public class PendingContact {
-
-	private final PendingContactId id;
-	private final PublicKey publicKey;
-	private final String alias;
-	private final long timestamp;
-
-	public PendingContact(PendingContactId id, PublicKey publicKey,
-			String alias, long timestamp) {
-		this.id = id;
-		this.publicKey = publicKey;
-		this.alias = alias;
-		this.timestamp = timestamp;
-	}
-
-	public PendingContactId getId() {
-		return id;
-	}
-
-	public PublicKey getPublicKey() {
-		return publicKey;
-	}
-
-	public String getAlias() {
-		return alias;
-	}
-
-	public long getTimestamp() {
-		return timestamp;
-	}
-
-	@Override
-	public int hashCode() {
-		return id.hashCode();
-	}
-
-	@Override
-	public boolean equals(Object o) {
-		return o instanceof PendingContact &&
-				id.equals(((PendingContact) o).id);
-	}
-}

bramble-api/src/main/java/org/briarproject/bramble/api/contact/PendingContactId.java

@@ -1,25 +0,0 @@
-package org.briarproject.bramble.api.contact;
-
-import org.briarproject.bramble.api.UniqueId;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
-import javax.annotation.Nullable;
-import javax.annotation.concurrent.ThreadSafe;
-
-/**
- * Type-safe wrapper for a byte array that uniquely identifies a
- * {@link PendingContact}.
- */
-@ThreadSafe
-@NotNullByDefault
-public class PendingContactId extends UniqueId {
-
-	public PendingContactId(byte[] id) {
-		super(id);
-	}
-
-	@Override
-	public boolean equals(@Nullable Object o) {
-		return o instanceof PendingContactId && super.equals(o);
-	}
-}

bramble-api/src/main/java/org/briarproject/bramble/api/contact/PendingContactState.java

@@ -1,10 +0,0 @@
-package org.briarproject.bramble.api.contact;
-
-public enum PendingContactState {
-
-	WAITING_FOR_CONNECTION,
-	OFFLINE,
-	CONNECTING,
-	ADDING_CONTACT,
-	FAILED
-}

bramble-api/src/main/java/org/briarproject/bramble/api/contact/RecordTypes.java

@@ -1,9 +1,9 @@
-package org.briarproject.bramble.contact;
+package org.briarproject.bramble.api.contact;
 
 /**
  * Record types for the contact exchange protocol.
  */
-interface ContactExchangeRecordTypes {
+public interface RecordTypes {
 
 	byte CONTACT_INFO = 0;
 }

bramble-api/src/main/java/org/briarproject/bramble/api/contact/event/ContactAddedEvent.java

@@ -14,18 +14,18 @@ import javax.annotation.concurrent.Immutable;
 public class ContactAddedEvent extends Event {
 
 	private final ContactId contactId;
-	private final boolean verified;
+	private final boolean active;
 
-	public ContactAddedEvent(ContactId contactId, boolean verified) {
+	public ContactAddedEvent(ContactId contactId, boolean active) {
 		this.contactId = contactId;
-		this.verified = verified;
+		this.active = active;
 	}
 
 	public ContactId getContactId() {
 		return contactId;
 	}
 
-	public boolean isVerified() {
+	public boolean isActive() {
-		return verified;
+		return active;
 	}
 }

bramble-api/src/main/java/org/briarproject/bramble/api/contact/event/ContactStatusChangedEvent.java

@@ -0,0 +1,31 @@
+package org.briarproject.bramble.api.contact.event;
+
+import org.briarproject.bramble.api.contact.ContactId;
+import org.briarproject.bramble.api.event.Event;
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+import javax.annotation.concurrent.Immutable;
+
+/**
+ * An event that is broadcast when a contact is marked active or inactive.
+ */
+@Immutable
+@NotNullByDefault
+public class ContactStatusChangedEvent extends Event {
+
+	private final ContactId contactId;
+	private final boolean active;
+
+	public ContactStatusChangedEvent(ContactId contactId, boolean active) {
+		this.contactId = contactId;
+		this.active = active;
+	}
+
+	public ContactId getContactId() {
+		return contactId;
+	}
+
+	public boolean isActive() {
+		return active;
+	}
+}

bramble-api/src/main/java/org/briarproject/bramble/api/contact/event/PendingContactAddedEvent.java

@@ -1,25 +0,0 @@
-package org.briarproject.bramble.api.contact.event;
-
-import org.briarproject.bramble.api.contact.PendingContact;
-import org.briarproject.bramble.api.event.Event;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
-import javax.annotation.concurrent.Immutable;
-
-/**
- * An event that is broadcast when a pending contact is added.
- */
-@Immutable
-@NotNullByDefault
-public class PendingContactAddedEvent extends Event {
-
-	private final PendingContact pendingContact;
-
-	public PendingContactAddedEvent(PendingContact pendingContact) {
-		this.pendingContact = pendingContact;
-	}
-
-	public PendingContact getPendingContact() {
-		return pendingContact;
-	}
-}

bramble-api/src/main/java/org/briarproject/bramble/api/contact/event/PendingContactRemovedEvent.java

@@ -1,26 +0,0 @@
-package org.briarproject.bramble.api.contact.event;
-
-import org.briarproject.bramble.api.contact.PendingContactId;
-import org.briarproject.bramble.api.event.Event;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
-import javax.annotation.concurrent.Immutable;
-
-/**
- * An event that is broadcast when a pending contact is removed.
- */
-@Immutable
-@NotNullByDefault
-public class PendingContactRemovedEvent extends Event {
-
-	private final PendingContactId id;
-
-	public PendingContactRemovedEvent(PendingContactId id) {
-		this.id = id;
-	}
-
-	public PendingContactId getId() {
-		return id;
-	}
-
-}

bramble-api/src/main/java/org/briarproject/bramble/api/contact/event/PendingContactStateChangedEvent.java

@@ -1,34 +0,0 @@
-package org.briarproject.bramble.api.contact.event;
-
-import org.briarproject.bramble.api.contact.PendingContactId;
-import org.briarproject.bramble.api.contact.PendingContactState;
-import org.briarproject.bramble.api.event.Event;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
-import javax.annotation.concurrent.Immutable;
-
-/**
- * An event that is broadcast when a pending contact's state is changed.
- */
-@Immutable
-@NotNullByDefault
-public class PendingContactStateChangedEvent extends Event {
-
-	private final PendingContactId id;
-	private final PendingContactState state;
-
-	public PendingContactStateChangedEvent(PendingContactId id,
-			PendingContactState state) {
-		this.id = id;
-		this.state = state;
-	}
-
-	public PendingContactId getId() {
-		return id;
-	}
-
-	public PendingContactState getPendingContactState() {
-		return state;
-	}
-
-}

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

@@ -1,30 +0,0 @@
-package org.briarproject.bramble.api.crypto;
-
-import org.briarproject.bramble.api.Bytes;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
-import javax.annotation.concurrent.Immutable;
-
-import static org.briarproject.bramble.api.crypto.CryptoConstants.KEY_TYPE_AGREEMENT;
-
-/**
- * Type-safe wrapper for a private key used for key agreement.
- */
-@Immutable
-@NotNullByDefault
-public class AgreementPrivateKey extends Bytes implements PrivateKey {
-
-	public AgreementPrivateKey(byte[] encoded) {
-		super(encoded);
-	}
-
-	@Override
-	public String getKeyType() {
-		return KEY_TYPE_AGREEMENT;
-	}
-
-	@Override
-	public byte[] getEncoded() {
-		return getBytes();
-	}
-}

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

@@ -1,35 +0,0 @@
-package org.briarproject.bramble.api.crypto;
-
-import org.briarproject.bramble.api.Bytes;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
-import javax.annotation.concurrent.Immutable;
-
-import static org.briarproject.bramble.api.crypto.CryptoConstants.KEY_TYPE_AGREEMENT;
-import static org.briarproject.bramble.api.crypto.CryptoConstants.MAX_AGREEMENT_PUBLIC_KEY_BYTES;
-
-/**
- * Type-safe wrapper for a public key used for key agreement.
- */
-@Immutable
-@NotNullByDefault
-public class AgreementPublicKey extends Bytes implements PublicKey {
-
-	public AgreementPublicKey(byte[] encoded) {
-		super(encoded);
-		if (encoded.length == 0 ||
-				encoded.length > MAX_AGREEMENT_PUBLIC_KEY_BYTES) {
-			throw new IllegalArgumentException();
-		}
-	}
-
-	@Override
-	public String getKeyType() {
-		return KEY_TYPE_AGREEMENT;
-	}
-
-	@Override
-	public byte[] getEncoded() {
-		return getBytes();
-	}
-}

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

@@ -27,78 +27,54 @@ public interface CryptoComponent {
 	/**
 	 * Derives another secret key from the given secret key.
 	 *
-	 * @param label A namespaced label indicating the purpose of the derived
+	 * @param label a namespaced label indicating the purpose of the derived
 	 * key, to prevent it from being repurposed or colliding with a key derived
 	 * for another purpose
-	 * @param inputs Additional inputs that will be included in the derivation
-	 * of the key
 	 */
 	SecretKey deriveKey(String label, SecretKey k, byte[]... inputs);
 
 	/**
-	 * Derives a shared secret from two key pairs.
+	 * Derives a common shared secret from two public keys and one of the
+	 * corresponding private keys.
 	 *
-	 * @param label A namespaced label indicating the purpose of this shared
+	 * @param label a namespaced label indicating the purpose of this shared
 	 * secret, to prevent it from being repurposed or colliding with a shared
 	 * secret derived for another purpose
-	 * @param theirPublicKey The public key of the remote party
+	 * @param theirPublicKey the public key of the remote party
-	 * @param ourKeyPair The key pair of the local party
+	 * @param ourKeyPair the key pair of the local party
-	 * @param inputs Additional inputs that will be included in the derivation
+	 * @return the shared secret
-	 * of the shared secret
-	 * @return The shared secret
 	 */
 	SecretKey deriveSharedSecret(String label, PublicKey theirPublicKey,
 			KeyPair ourKeyPair, byte[]... inputs)
 			throws GeneralSecurityException;
 
-	/**
-	 * Derives a shared secret from two static and two ephemeral key pairs.
-	 *
-	 * @param label A namespaced label indicating the purpose of this shared
-	 * secret, to prevent it from being repurposed or colliding with a shared
-	 * secret derived for another purpose
-	 * @param theirStaticPublicKey The static public key of the remote party
-	 * @param theirEphemeralPublicKey The ephemeral public key of the remote
-	 * party
-	 * @param ourStaticKeyPair The static key pair of the local party
-	 * @param ourEphemeralKeyPair The ephemeral key pair of the local party
-	 * @param alice True if the local party is Alice
-	 * @param inputs Additional inputs that will be included in the
-	 * derivation of the shared secret
-	 * @return The shared secret
-	 */
-	SecretKey deriveSharedSecret(String label, PublicKey theirStaticPublicKey,
-			PublicKey theirEphemeralPublicKey, KeyPair ourStaticKeyPair,
-			KeyPair ourEphemeralKeyPair, boolean alice, byte[]... inputs)
-			throws GeneralSecurityException;
-
 	/**
 	 * Signs the given byte[] with the given private key.
 	 *
-	 * @param label A namespaced label indicating the purpose of this
+	 * @param label a namespaced label indicating the purpose of this
 	 * signature, to prevent it from being repurposed or colliding with a
 	 * signature created for another purpose
 	 */
-	byte[] sign(String label, byte[] toSign, PrivateKey privateKey)
+	byte[] sign(String label, byte[] toSign, byte[] privateKey)
 			throws GeneralSecurityException;
 
 	/**
 	 * Verifies that the given signature is valid for the signed data
 	 * and the given public key.
 	 *
-	 * @param label A namespaced label indicating the purpose of this
+	 * @param label a namespaced label indicating the purpose of this
 	 * signature, to prevent it from being repurposed or colliding with a
 	 * signature created for another purpose
-	 * @return True if the signature was valid, false otherwise.
+	 * @return true if the signature was valid, false otherwise.
 	 */
 	boolean verifySignature(byte[] signature, String label, byte[] signed,
-			PublicKey publicKey) throws GeneralSecurityException;
+			byte[] publicKey) throws GeneralSecurityException;
 
 	/**
 	 * Returns the hash of the given inputs. The inputs are unambiguously
 	 * combined by prefixing each input with its length.
 	 *
-	 * @param label A namespaced label indicating the purpose of this hash, to
+	 * @param label a namespaced label indicating the purpose of this hash, to
 	 * prevent it from being repurposed or colliding with a hash created for
 	 * another purpose
 	 */
@@ -109,7 +85,7 @@ public interface CryptoComponent {
 	 * given inputs. The inputs are unambiguously combined by prefixing each
 	 * input with its length.
 	 *
-	 * @param label A namespaced label indicating the purpose of this MAC, to
+	 * @param label a namespaced label indicating the purpose of this MAC, to
 	 * prevent it from being repurposed or colliding with a MAC created for
 	 * another purpose
 	 */
@@ -119,10 +95,10 @@ public interface CryptoComponent {
 	 * Verifies that the given message authentication code is valid for the
 	 * given secret key and inputs.
 	 *
-	 * @param label A namespaced label indicating the purpose of this MAC, to
+	 * @param label a namespaced label indicating the purpose of this MAC, to
 	 * prevent it from being repurposed or colliding with a MAC created for
 	 * another purpose
-	 * @return True if the MAC was valid, false otherwise.
+	 * @return true if the MAC was valid, false otherwise.
 	 */
 	boolean verifyMac(byte[] mac, String label, SecretKey macKey,
 			byte[]... inputs);
@@ -132,33 +108,17 @@ public interface CryptoComponent {
 	 * storage. The encryption and authentication keys are derived from the
 	 * given password. The ciphertext will be decryptable using the same
 	 * password after the app restarts.
-	 *
-	 * @param keyStrengthener Used to strengthen the password-based key. If
-	 * null, the password-based key will not be strengthened
 	 */
-	byte[] encryptWithPassword(byte[] plaintext, String password,
+	byte[] encryptWithPassword(byte[] plaintext, String password);
-			@Nullable KeyStrengthener keyStrengthener);
 
 	/**
 	 * Decrypts and authenticates the given ciphertext that has been read from
 	 * storage. The encryption and authentication keys are derived from the
-	 * given password.
+	 * given password. Returns null if the ciphertext cannot be decrypted and
-	 *
-	 * @param keyStrengthener Used to strengthen the password-based key. If
-	 * null, or if strengthening was not used when encrypting the ciphertext,
-	 * the password-based key will not be strengthened
-	 * @throws DecryptionException If the ciphertext cannot be decrypted and
 	 * authenticated (for example, if the password is wrong).
 	 */
-	byte[] decryptWithPassword(byte[] ciphertext, String password,
+	@Nullable
-			@Nullable KeyStrengthener keyStrengthener)
+	byte[] decryptWithPassword(byte[] ciphertext, String password);
-			throws DecryptionException;
-
-	/**
-	 * Returns true if the given ciphertext was encrypted using a strengthened
-	 * key. The validity of the ciphertext is not checked.
-	 */
-	boolean isEncryptedWithStrengthenedKey(byte[] ciphertext);
 
 	/**
 	 * Encrypts the given plaintext to the given public key.

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

@@ -7,21 +7,11 @@ public interface CryptoConstants {
 	 */
 	int MAX_AGREEMENT_PUBLIC_KEY_BYTES = 32;
 
-	/**
-	 * The key type for agreement key pairs.
-	 */
-	String KEY_TYPE_AGREEMENT = "Curve25519";
-
 	/**
 	 * The maximum length of a signature public key in bytes.
 	 */
 	int MAX_SIGNATURE_PUBLIC_KEY_BYTES = 32;
 
-	/**
-	 * The key type for signature key pairs.
-	 */
-	String KEY_TYPE_SIGNATURE = "Ed25519";
-
 	/**
 	 * The maximum length of a signature in bytes.
 	 */

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

@@ -1,17 +0,0 @@
-package org.briarproject.bramble.api.crypto;
-
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
-@NotNullByDefault
-public class DecryptionException extends Exception {
-
-	private final DecryptionResult result;
-
-	public DecryptionException(DecryptionResult result) {
-		this.result = result;
-	}
-
-	public DecryptionResult getDecryptionResult() {
-		return result;
-	}
-}

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

@@ -1,29 +0,0 @@
-package org.briarproject.bramble.api.crypto;
-
-/**
- * The result of a password-based decryption operation.
- */
-public enum DecryptionResult {
-
-	/**
-	 * Decryption succeeded.
-	 */
-	SUCCESS,
-
-	/**
-	 * Decryption failed because the format of the ciphertext was invalid.
-	 */
-	INVALID_CIPHERTEXT,
-
-	/**
-	 * Decryption failed because the {@link KeyStrengthener} used for
-	 * encryption was not available for decryption.
-	 */
-	KEY_STRENGTHENER_ERROR,
-
-	/**
-	 * Decryption failed because the password used for decryption did not match
-	 * the password used for encryption.
-	 */
-	INVALID_PASSWORD
-}

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

@@ -2,7 +2,7 @@ package org.briarproject.bramble.api.crypto;
 
 /**
  * Crypto operations for the key agreement protocol - see
- * https://code.briarproject.org/briar/briar-spec/blob/master/protocols/BQP.md
+ * https://code.briarproject.org/akwizgran/briar-spec/blob/master/protocols/BQP.md
  */
 public interface KeyAgreementCrypto {
 

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

@@ -15,8 +15,6 @@ public class KeyPair {
 	private final PrivateKey privateKey;
 
 	public KeyPair(PublicKey publicKey, PrivateKey privateKey) {
-		if (!publicKey.getKeyType().equals(privateKey.getKeyType()))
-			throw new IllegalArgumentException();
 		this.publicKey = publicKey;
 		this.privateKey = privateKey;
 	}

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

@@ -1,23 +0,0 @@
-package org.briarproject.bramble.api.crypto;
-
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
-/**
- * Interface for strengthening a password-based key, for example by using a
- * key stored in a key management service or hardware security module.
- */
-@NotNullByDefault
-public interface KeyStrengthener {
-
-	/**
-	 * Returns true if the strengthener has been initialised.
-	 */
-	@SuppressWarnings("BooleanMethodIsAlwaysInverted")
-	boolean isInitialised();
-
-	/**
-	 * Initialises the strengthener if necessary and returns a strong key
-	 * derived from the given key.
-	 */
-	SecretKey strengthenKey(SecretKey k);
-}

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

@@ -8,11 +8,6 @@ import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 @NotNullByDefault
 public interface PrivateKey {
 
-	/**
-	 * Returns the type of this key pair.
-	 */
-	String getKeyType();
-
 	/**
 	 * Returns the encoded representation of this key.
 	 */

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

@@ -8,11 +8,6 @@ import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 @NotNullByDefault
 public interface PublicKey {
 
-	/**
-	 * Returns the type of this key pair.
-	 */
-	String getKeyType();
-
 	/**
 	 * Returns the encoded representation of this key.
 	 */

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

@@ -1,30 +0,0 @@
-package org.briarproject.bramble.api.crypto;
-
-import org.briarproject.bramble.api.Bytes;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
-import javax.annotation.concurrent.Immutable;
-
-import static org.briarproject.bramble.api.crypto.CryptoConstants.KEY_TYPE_SIGNATURE;
-
-/**
- * Type-safe wrapper for a public key used for signing.
- */
-@Immutable
-@NotNullByDefault
-public class SignaturePrivateKey extends Bytes implements PrivateKey {
-
-	public SignaturePrivateKey(byte[] bytes) {
-		super(bytes);
-	}
-
-	@Override
-	public String getKeyType() {
-		return KEY_TYPE_SIGNATURE;
-	}
-
-	@Override
-	public byte[] getEncoded() {
-		return getBytes();
-	}
-}

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

@@ -1,35 +0,0 @@
-package org.briarproject.bramble.api.crypto;
-
-import org.briarproject.bramble.api.Bytes;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
-import javax.annotation.concurrent.Immutable;
-
-import static org.briarproject.bramble.api.crypto.CryptoConstants.KEY_TYPE_SIGNATURE;
-import static org.briarproject.bramble.api.crypto.CryptoConstants.MAX_SIGNATURE_PUBLIC_KEY_BYTES;
-
-/**
- * Type-safe wrapper for a public key used for verifying signatures.
- */
-@Immutable
-@NotNullByDefault
-public class SignaturePublicKey extends Bytes implements PublicKey {
-
-	public SignaturePublicKey(byte[] encoded) {
-		super(encoded);
-		if (encoded.length == 0 ||
-				encoded.length > MAX_SIGNATURE_PUBLIC_KEY_BYTES) {
-			throw new IllegalArgumentException();
-		}
-	}
-
-	@Override
-	public String getKeyType() {
-		return KEY_TYPE_SIGNATURE;
-	}
-
-	@Override
-	public byte[] getEncoded() {
-		return getBytes();
-	}
-}

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

@@ -3,61 +3,27 @@ package org.briarproject.bramble.api.crypto;
 import org.briarproject.bramble.api.plugin.TransportId;
 import org.briarproject.bramble.api.transport.TransportKeys;
 
-import java.security.GeneralSecurityException;
-
 /**
  * Crypto operations for the transport security protocol - see
- * https://code.briarproject.org/briar/briar-spec/blob/master/protocols/BTP.md
+ * https://code.briarproject.org/akwizgran/briar-spec/blob/master/protocols/BTP.md
  */
 public interface TransportCrypto {
 
 	/**
-	 * Returns true if the local peer is Alice.
+	 * Derives initial transport keys for the given transport in the given
-	 */
+	 * rotation period from the given master secret.
-	boolean isAlice(PublicKey theirHandshakePublicKey,
-			KeyPair ourHandshakeKeyPair);
-
-	/**
-	 * Derives the static master key shared with a contact or pending contact.
-	 */
-	SecretKey deriveStaticMasterKey(PublicKey theirHandshakePublicKey,
-			KeyPair ourHandshakeKeyPair) throws GeneralSecurityException;
-
-	/**
-	 * Derives the handshake mode root key from the static master key. To
-	 * prevent tag reuse, separate root keys are derived for contacts and
-	 * pending contacts.
 	 *
-	 * @param pendingContact Whether the static master key is shared with a
+	 * @param alice whether the keys are for use by Alice or Bob.
-	 * pending contact or a contact
+	 * @param active whether the keys are usable for outgoing streams.
 	 */
-	SecretKey deriveHandshakeRootKey(SecretKey staticMasterKey,
+	TransportKeys deriveTransportKeys(TransportId t, SecretKey master,
-			boolean pendingContact);
+			long rotationPeriod, boolean alice, boolean active);
 
 	/**
-	 * Derives initial rotation mode transport keys for the given transport in
+	 * Rotates the given transport keys to the given rotation period. If the
-	 * the given time period from the given root key.
+	 * keys are for the given period or any later period they are not rotated.
-	 *
-	 * @param alice Whether the keys are for use by Alice or Bob
-	 * @param active Whether the keys are usable for outgoing streams
 	 */
-	TransportKeys deriveRotationKeys(TransportId t, SecretKey rootKey,
+	TransportKeys rotateTransportKeys(TransportKeys k, long rotationPeriod);
-			long timePeriod, boolean alice, boolean active);
-
-	/**
-	 * Derives handshake keys for the given transport in the given time period
-	 * from the given root key.
-	 *
-	 * @param alice Whether the keys are for use by Alice or Bob
-	 */
-	TransportKeys deriveHandshakeKeys(TransportId t, SecretKey rootKey,
-			long timePeriod, boolean alice);
-
-	/**
-	 * Updates the given transport keys to the given time period. If the keys
-	 * are for the given period or any later period they are not updated.
-	 */
-	TransportKeys updateTransportKeys(TransportKeys k, long timePeriod);
 
 	/**
 	 * Encodes the pseudo-random tag that is used to recognise a stream.

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

@@ -1,71 +0,0 @@
-package org.briarproject.bramble.api.data;
-
-import org.briarproject.bramble.api.Bytes;
-import org.briarproject.bramble.api.FormatException;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
-import java.util.List;
-import java.util.Map;
-import java.util.Map.Entry;
-
-import javax.annotation.Nullable;
-
-import static org.briarproject.bramble.api.data.BdfDictionary.NULL_VALUE;
-import static org.briarproject.bramble.util.StringUtils.toHexString;
-
-@NotNullByDefault
-public class BdfStringUtils {
-
-	public static String toString(@Nullable Object o) throws FormatException {
-		return toString(o, 0);
-	}
-
-	private static String toString(@Nullable Object o, int indent)
-			throws FormatException {
-		if (o == null || o == NULL_VALUE) return "null";
-		if (o instanceof Boolean) return o.toString();
-		if (o instanceof Number) return o.toString();
-		if (o instanceof String) return "\"" + o + "\"";
-		if (o instanceof Bytes)
-			return "x" + toHexString(((Bytes) o).getBytes());
-		if (o instanceof byte[])
-			return "x" + toHexString((byte[]) o);
-		if (o instanceof List) {
-			List<?> list = (List) o;
-			StringBuilder sb = new StringBuilder();
-			sb.append("[\n");
-			int i = 0, size = list.size();
-			for (Object e : list) {
-				indent(sb, indent + 1);
-				sb.append(toString(e, indent + 1));
-				if (i++ < size - 1) sb.append(',');
-				sb.append('\n');
-			}
-			indent(sb, indent);
-			sb.append(']');
-			return sb.toString();
-		}
-		if (o instanceof Map) {
-			Map<?, ?> map = (Map) o;
-			StringBuilder sb = new StringBuilder();
-			sb.append("{\n");
-			int i = 0, size = map.size();
-			for (Entry e : map.entrySet()) {
-				indent(sb, indent + 1);
-				sb.append(toString(e.getKey(), indent + 1));
-				sb.append(": ");
-				sb.append(toString(e.getValue(), indent + 1));
-				if (i++ < size - 1) sb.append(',');
-				sb.append('\n');
-			}
-			indent(sb, indent);
-			sb.append('}');
-			return sb.toString();
-		}
-		throw new FormatException();
-	}
-
-	private static void indent(StringBuilder sb, int indent) {
-		for (int i = 0; i < indent; i++) sb.append('\t');
-	}
-}

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

@@ -1,20 +0,0 @@
-package org.briarproject.bramble.api.db;
-
-import org.briarproject.bramble.api.event.EventExecutor;
-
-/**
- * An action that's taken when a {@link Transaction} is committed.
- */
-public interface CommitAction {
-
-	void accept(Visitor visitor);
-
-	interface Visitor {
-
-		@EventExecutor
-		void visit(EventAction a);
-
-		@EventExecutor
-		void visit(TaskAction a);
-	}
-}

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

@@ -1,27 +1,8 @@
 package org.briarproject.bramble.api.db;
 
-import org.briarproject.bramble.api.identity.Author;
-import org.briarproject.bramble.api.identity.AuthorId;
-
 /**
  * Thrown when a duplicate contact is added to the database. This exception may
  * occur due to concurrent updates and does not indicate a database error.
  */
 public class ContactExistsException extends DbException {
-
-	private final AuthorId local;
-	private final Author remote;
-
-	public ContactExistsException(AuthorId local, Author remote) {
-		this.local = local;
-		this.remote = remote;
-	}
-
-	public AuthorId getLocalAuthorId() {
-		return local;
-	}
-
-	public Author getRemoteAuthor() {
-		return remote;
-	}
 }

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

@@ -2,14 +2,10 @@ package org.briarproject.bramble.api.db;
 
 import org.briarproject.bramble.api.contact.Contact;
 import org.briarproject.bramble.api.contact.ContactId;
-import org.briarproject.bramble.api.contact.PendingContact;
-import org.briarproject.bramble.api.contact.PendingContactId;
-import org.briarproject.bramble.api.crypto.PrivateKey;
-import org.briarproject.bramble.api.crypto.PublicKey;
 import org.briarproject.bramble.api.crypto.SecretKey;
 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.LocalAuthor;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.TransportId;
 import org.briarproject.bramble.api.settings.Settings;
@@ -23,23 +19,23 @@ import org.briarproject.bramble.api.sync.MessageId;
 import org.briarproject.bramble.api.sync.MessageStatus;
 import org.briarproject.bramble.api.sync.Offer;
 import org.briarproject.bramble.api.sync.Request;
-import org.briarproject.bramble.api.sync.validation.MessageState;
+import org.briarproject.bramble.api.transport.KeySet;
 import org.briarproject.bramble.api.transport.KeySetId;
-import org.briarproject.bramble.api.transport.TransportKeySet;
 import org.briarproject.bramble.api.transport.TransportKeys;
 
 import java.util.Collection;
-import java.util.List;
 import java.util.Map;
 
 import javax.annotation.Nullable;
 
+import static org.briarproject.bramble.api.sync.ValidationManager.State;
+
 /**
  * Encapsulates the database implementation and exposes high-level operations
  * to other components.
  */
 @NotNullByDefault
-public interface DatabaseComponent extends TransactionManager {
+public interface DatabaseComponent {
 
 	/**
 	 * Opens the database and returns true if the database already existed.
@@ -57,12 +53,35 @@ public interface DatabaseComponent extends TransactionManager {
 	 */
 	void close() throws DbException;
 
+	/**
+	 * Starts a new transaction and returns an object representing it.
+	 * <p/>
+	 * This method acquires locks, so it must not be called while holding a
+	 * lock.
+	 *
+	 * @param readOnly true if the transaction will only be used for reading.
+	 */
+	Transaction startTransaction(boolean readOnly) throws DbException;
+
+	/**
+	 * Commits a transaction to the database.
+	 */
+	void commitTransaction(Transaction txn) throws DbException;
+
+	/**
+	 * Ends a transaction. If the transaction has not been committed,
+	 * it will be aborted. If the transaction has been committed,
+	 * any events attached to the transaction are broadcast.
+	 * The database lock will be released in either case.
+	 */
+	void endTransaction(Transaction txn);
+
 	/**
 	 * Stores a contact associated with the given local and remote pseudonyms,
 	 * and returns an ID for the contact.
 	 */
 	ContactId addContact(Transaction txn, Author remote, AuthorId local,
-			@Nullable PublicKey handshake, boolean verified) throws DbException;
+			boolean verified, boolean active) throws DbException;
 
 	/**
 	 * Stores a group.
@@ -70,21 +89,15 @@ public interface DatabaseComponent extends TransactionManager {
 	void addGroup(Transaction txn, Group g) throws DbException;
 
 	/**
-	 * Stores an identity.
+	 * Stores a local pseudonym.
 	 */
-	void addIdentity(Transaction txn, Identity i) throws DbException;
+	void addLocalAuthor(Transaction txn, LocalAuthor a) throws DbException;
 
 	/**
 	 * Stores a local message.
 	 */
 	void addLocalMessage(Transaction txn, Message m, Metadata meta,
-			boolean shared, boolean temporary) throws DbException;
+			boolean shared) throws DbException;
-
-	/**
-	 * Stores a pending contact.
-	 */
-	void addPendingContact(Transaction txn, PendingContact p, AuthorId local)
-			throws DbException;
 
 	/**
 	 * Stores a transport.
@@ -96,46 +109,25 @@ public interface DatabaseComponent extends TransactionManager {
 	 * Stores the given transport keys for the given contact and returns a
 	 * key set ID.
 	 */
-	KeySetId addTransportKeys(Transaction txn, ContactId c, TransportKeys k)
+	KeySetId addTransportKeys(Transaction txn, ContactId c,
-			throws DbException;
-
-	/**
-	 * Stores the given transport keys for the given pending contact and
-	 * returns a key set ID.
-	 */
-	KeySetId addTransportKeys(Transaction txn, PendingContactId p,
 			TransportKeys k) throws DbException;
 
 	/**
 	 * Returns true if the database contains the given contact for the given
 	 * local pseudonym.
-	 * <p/>
-	 * Read-only.
 	 */
 	boolean containsContact(Transaction txn, AuthorId remote, AuthorId local)
 			throws DbException;
 
 	/**
 	 * Returns true if the database contains the given group.
-	 * <p/>
-	 * Read-only.
 	 */
 	boolean containsGroup(Transaction txn, GroupId g) throws DbException;
 
 	/**
-	 * Returns true if the database contains an identity for the given
+	 * Returns true if the database contains the given local author.
-	 * pseudonym.
-	 * <p/>
-	 * Read-only.
 	 */
-	boolean containsIdentity(Transaction txn, AuthorId a) throws DbException;
+	boolean containsLocalAuthor(Transaction txn, AuthorId local)
-
-	/**
-	 * Returns true if the database contains the given pending contact.
-	 * <p/>
-	 * Read-only.
-	 */
-	boolean containsPendingContact(Transaction txn, PendingContactId p)
 			throws DbException;
 
 	/**
@@ -159,13 +151,13 @@ public interface DatabaseComponent extends TransactionManager {
 			throws DbException;
 
 	/**
-	 * Returns a batch of messages for the given contact, with a total length
+	 * Returns a batch of raw messages for the given contact, with a total
-	 * less than or equal to the given length, for transmission over a
+	 * length less than or equal to the given length, for transmission over a
 	 * transport with the given maximum latency. Returns null if there are no
 	 * sendable messages that fit in the given length.
 	 */
 	@Nullable
-	Collection<Message> generateBatch(Transaction txn, ContactId c,
+	Collection<byte[]> generateBatch(Transaction txn, ContactId c,
 			int maxLength, int maxLatency) throws DbException;
 
 	/**
@@ -186,14 +178,14 @@ public interface DatabaseComponent extends TransactionManager {
 			throws DbException;
 
 	/**
-	 * Returns a batch of messages for the given contact, with a total length
+	 * Returns a batch of raw messages for the given contact, with a total
-	 * less than or equal to the given length, for transmission over a
+	 * length less than or equal to the given length, for transmission over a
 	 * transport with the given maximum latency. Only messages that have been
 	 * requested by the contact are returned. Returns null if there are no
 	 * sendable messages that fit in the given length.
 	 */
 	@Nullable
-	Collection<Message> generateRequestedBatch(Transaction txn, ContactId c,
+	Collection<byte[]> generateRequestedBatch(Transaction txn, ContactId c,
 			int maxLength, int maxLatency) throws DbException;
 
 	/**
@@ -223,7 +215,7 @@ public interface DatabaseComponent extends TransactionManager {
 	 * <p/>
 	 * Read-only.
 	 */
-	Collection<ContactId> getContacts(Transaction txn, AuthorId local)
+	Collection<ContactId> getContacts(Transaction txn, AuthorId a)
 			throws DbException;
 
 	/**
@@ -258,27 +250,18 @@ public interface DatabaseComponent extends TransactionManager {
 			throws DbException;
 
 	/**
-	 * Returns the identity for the local pseudonym with the given ID.
+	 * Returns the local pseudonym with the given ID.
 	 * <p/>
 	 * Read-only.
 	 */
-	Identity getIdentity(Transaction txn, AuthorId a) throws DbException;
+	LocalAuthor getLocalAuthor(Transaction txn, AuthorId a) throws DbException;
 
 	/**
-	 * Returns the identities for all local pseudonyms.
+	 * Returns all local pseudonyms.
 	 * <p/>
 	 * Read-only.
 	 */
-	Collection<Identity> getIdentities(Transaction txn) throws DbException;
+	Collection<LocalAuthor> getLocalAuthors(Transaction txn) throws DbException;
-
-	/**
-	 * Returns the message with the given ID.
-	 * <p/>
-	 * Read-only.
-	 *
-	 * @throws MessageDeletedException if the message has been deleted
-	 */
-	Message getMessage(Transaction txn, MessageId m) throws DbException;
 
 	/**
 	 * Returns the IDs of all delivered messages in the given group.
@@ -314,6 +297,15 @@ public interface DatabaseComponent extends TransactionManager {
 	Collection<MessageId> getMessagesToShare(Transaction txn)
 			throws DbException;
 
+	/**
+	 * Returns the message with the given ID, in serialised form, or null if
+	 * the message has been deleted.
+	 * <p/>
+	 * Read-only.
+	 */
+	@Nullable
+	byte[] getRawMessage(Transaction txn, MessageId m) throws DbException;
+
 	/**
 	 * Returns the metadata for all delivered messages in the given group.
 	 * <p/>
@@ -361,12 +353,12 @@ public interface DatabaseComponent extends TransactionManager {
 	/**
 	 * Returns the IDs and states of all dependencies of the given message.
 	 * For missing dependencies and dependencies in other groups, the state
-	 * {@link MessageState UNKNOWN} is returned.
+	 * {@link State UNKNOWN} is returned.
 	 * <p/>
 	 * Read-only.
 	 */
-	Map<MessageId, MessageState> getMessageDependencies(Transaction txn,
+	Map<MessageId, State> getMessageDependencies(Transaction txn, MessageId m)
-			MessageId m) throws DbException;
+			throws DbException;
 
 	/**
 	 * Returns the IDs and states of all dependents of the given message.
@@ -375,16 +367,15 @@ public interface DatabaseComponent extends TransactionManager {
 	 * <p/>
 	 * Read-only.
 	 */
-	Map<MessageId, MessageState> getMessageDependents(Transaction txn,
+	Map<MessageId, State> getMessageDependents(Transaction txn, MessageId m)
-			MessageId m) throws DbException;
+			throws DbException;
 
 	/**
 	 * Gets the validation and delivery state of the given message.
 	 * <p/>
 	 * Read-only.
 	 */
-	MessageState getMessageState(Transaction txn, MessageId m)
+	State getMessageState(Transaction txn, MessageId m) throws DbException;
-			throws DbException;
 
 	/**
 	 * Returns the status of the given delivered message with respect to the
@@ -405,22 +396,6 @@ public interface DatabaseComponent extends TransactionManager {
 	 */
 	long getNextSendTime(Transaction txn, ContactId c) throws DbException;
 
-	/**
-	 * Returns the pending contact with the given ID.
-	 * <p/>
-	 * Read-only.
-	 */
-	PendingContact getPendingContact(Transaction txn, PendingContactId p)
-			throws DbException;
-
-	/**
-	 * Returns all pending contacts.
-	 * <p/>
-	 * Read-only.
-	 */
-	Collection<PendingContact> getPendingContacts(Transaction txn)
-			throws DbException;
-
 	/**
 	 * Returns all settings in the given namespace.
 	 * <p/>
@@ -428,19 +403,12 @@ public interface DatabaseComponent extends TransactionManager {
 	 */
 	Settings getSettings(Transaction txn, String namespace) throws DbException;
 
-	/**
-	 * Returns the versions of the sync protocol supported by the given contact.
-	 * <p/>
-	 * Read-only.
-	 */
-	List<Byte> getSyncVersions(Transaction txn, ContactId c) throws DbException;
-
 	/**
 	 * Returns all transport keys for the given transport.
 	 * <p/>
 	 * Read-only.
 	 */
-	Collection<TransportKeySet> getTransportKeys(Transaction txn, TransportId t)
+	Collection<KeySet> getTransportKeys(Transaction txn, TransportId t)
 			throws DbException;
 
 	/**
@@ -503,27 +471,15 @@ public interface DatabaseComponent extends TransactionManager {
 	void removeGroup(Transaction txn, Group g) throws DbException;
 
 	/**
-	 * Removes an identity (and all associated state) from the database.
+	 * Removes a local pseudonym (and all associated state) from the database.
 	 */
-	void removeIdentity(Transaction txn, AuthorId a) throws DbException;
+	void removeLocalAuthor(Transaction txn, AuthorId a) throws DbException;
 
 	/**
 	 * Removes a message (and all associated state) from the database.
 	 */
 	void removeMessage(Transaction txn, MessageId m) throws DbException;
 
-	/**
-	 * Removes a pending contact (and all associated state) from the database.
-	 */
-	void removePendingContact(Transaction txn, PendingContactId p)
-			throws DbException;
-
-	/**
-	 * Removes all temporary messages (and all associated state) from the
-	 * database.
-	 */
-	void removeTemporaryMessages(Transaction txn) throws DbException;
-
 	/**
 	 * Removes a transport (and all associated state) from the database.
 	 */
@@ -541,9 +497,9 @@ public interface DatabaseComponent extends TransactionManager {
 	void setContactVerified(Transaction txn, ContactId c) throws DbException;
 
 	/**
-	 * Sets an alias name for the contact or unsets it if alias is null.
+	 * Marks the given contact as active or inactive.
 	 */
-	void setContactAlias(Transaction txn, ContactId c, @Nullable String alias)
+	void setContactActive(Transaction txn, ContactId c, boolean active)
 			throws DbException;
 
 	/**
@@ -552,11 +508,6 @@ public interface DatabaseComponent extends TransactionManager {
 	void setGroupVisibility(Transaction txn, ContactId c, GroupId g,
 			Visibility v) throws DbException;
 
-	/**
-	 * Marks the given message as permanent, i.e. not temporary.
-	 */
-	void setMessagePermanent(Transaction txn, MessageId m) throws DbException;
-
 	/**
 	 * Marks the given message as shared.
 	 */
@@ -565,7 +516,7 @@ public interface DatabaseComponent extends TransactionManager {
 	/**
 	 * Sets the validation and delivery state of the given message.
 	 */
-	void setMessageState(Transaction txn, MessageId m, MessageState state)
+	void setMessageState(Transaction txn, MessageId m, State state)
 			throws DbException;
 
 	/**
@@ -575,23 +526,11 @@ public interface DatabaseComponent extends TransactionManager {
 			Collection<MessageId> dependencies) throws DbException;
 
 	/**
-	 * Sets the handshake key pair for the identity with the given ID.
+	 * Sets the reordering window for the given key set and transport in the
-	 */
+	 * given rotation period.
-	void setHandshakeKeyPair(Transaction txn, AuthorId local,
-			PublicKey publicKey, PrivateKey privateKey) throws DbException;
-
-	/**
-	 * Sets the reordering window for the given transport keys in the given
-	 * time period.
 	 */
 	void setReorderingWindow(Transaction txn, KeySetId k, TransportId t,
-			long timePeriod, long base, byte[] bitmap) throws DbException;
+			long rotationPeriod, long base, byte[] bitmap) throws DbException;
-
-	/**
-	 * Sets the versions of the sync protocol supported by the given contact.
-	 */
-	void setSyncVersions(Transaction txn, ContactId c, List<Byte> supported)
-			throws DbException;
 
 	/**
 	 * Marks the given transport keys as usable for outgoing streams.
@@ -602,6 +541,6 @@ public interface DatabaseComponent extends TransactionManager {
 	/**
 	 * Stores the given transport keys, deleting any keys they have replaced.
 	 */
-	void updateTransportKeys(Transaction txn, Collection<TransportKeySet> keys)
+	void updateTransportKeys(Transaction txn, Collection<KeySet> keys)
 			throws DbException;
 }

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

@@ -1,29 +1,15 @@
 package org.briarproject.bramble.api.db;
 
-import org.briarproject.bramble.api.crypto.KeyStrengthener;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 
 import java.io.File;
 
-import javax.annotation.Nullable;
-
 @NotNullByDefault
 public interface DatabaseConfig {
 
-	/**
-	 * Returns the directory where the database stores its data.
-	 */
 	File getDatabaseDirectory();
 
-	/**
-	 * Returns the directory where the encrypted database key is stored.
-	 */
 	File getDatabaseKeyDirectory();
 
-	/**
+	long getMaxSize();
-	 * Returns a {@link KeyStrengthener} for strengthening the encryption of
-	 * the database key, or null if no strengthener should be used.
-	 */
-	@Nullable
-	KeyStrengthener getKeyStrengthener();
 }

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

@@ -1,9 +0,0 @@
-package org.briarproject.bramble.api.db;
-
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
-@NotNullByDefault
-public interface DbCallable<R, E extends Exception> {
-
-	R call(Transaction txn) throws DbException, E;
-}

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

@@ -1,9 +0,0 @@
-package org.briarproject.bramble.api.db;
-
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-
-@NotNullByDefault
-public interface DbRunnable<E extends Exception> {
-
-	void run(Transaction txn) throws DbException, E;
-}

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

@@ -1,24 +0,0 @@
-package org.briarproject.bramble.api.db;
-
-import org.briarproject.bramble.api.event.Event;
-
-/**
- * A {@link CommitAction} that broadcasts an event.
- */
-public class EventAction implements CommitAction {
-
-	private final Event event;
-
-	EventAction(Event event) {
-		this.event = event;
-	}
-
-	public Event getEvent() {
-		return event;
-	}
-
-	@Override
-	public void accept(Visitor visitor) {
-		visitor.visit(this);
-	}
-}