add kobakei library to witness

Update bridge list, test for slow bridges

See merge request briar/briar!936

.gitignore

@@ -23,5 +23,6 @@ local.properties
 !.idea/codeStyles
 .gradle
 build/
+captures
 *.iml
 projectFilesBackup/

.gitlab-ci.yml

@@ -11,8 +11,8 @@ test:
       - .gradle/caches
 
   script:
-    - ./gradlew --no-daemon animalSnifferMain animalSnifferTest
-    - ./gradlew --no-daemon test
+    - ./gradlew --no-daemon -Djava.security.egd=file:/dev/urandom animalSnifferMain animalSnifferTest
+    - ./gradlew --no-daemon -Djava.security.egd=file:/dev/urandom test
 
   after_script:
     # these file change every time but should not be cached

.idea/runConfigurations/All_tests.xml

@@ -21,8 +21,9 @@
     <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-j2se" 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 briar-core" run_configuration_type="AndroidJUnit" />
     </method>
   </configuration>
-</component>
+</component>

.idea/runConfigurations/All_tests_in_bramble_android.xml

@@ -0,0 +1,20 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="All tests in bramble-android" type="AndroidJUnit" factoryName="Android JUnit">
+    <module name="bramble-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="file://$PROJECT_DIR$/bramble-android" />
+    <option name="PASS_PARENT_ENVS" value="true" />
+    <option name="TEST_SEARCH_SCOPE">
+      <value defaultName="singleModule" />
+    </option>
+    <patterns />
+    <method />
+  </configuration>
+</component>

.idea/runConfigurations/All_tests_in_bramble_api.xml

@@ -1,6 +1,5 @@
 <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" />
@@ -11,12 +10,10 @@
     <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

@@ -1,6 +1,5 @@
 <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" />
@@ -11,12 +10,10 @@
     <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_java.xml

@@ -1,7 +1,6 @@
 <component name="ProjectRunConfigurationManager">
-  <configuration default="false" name="All tests in bramble-j2se" type="AndroidJUnit" factoryName="Android JUnit">
-    <extension name="coverage" enabled="false" merge="false" sample_coverage="true" runner="idea" />
-    <module name="bramble-j2se" />
+  <configuration default="false" name="All tests in bramble-java" type="AndroidJUnit" factoryName="Android JUnit">
+    <module name="bramble-java" />
     <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
     <option name="ALTERNATIVE_JRE_PATH" />
     <option name="PACKAGE_NAME" value="" />
@@ -10,13 +9,11 @@
     <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-j2se" />
-    <option name="ENV_VARIABLES" />
+    <option name="WORKING_DIRECTORY" value="file://$PROJECT_DIR$/bramble-java" />
     <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

@@ -1,6 +1,5 @@
 <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" />
@@ -11,12 +10,10 @@
     <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

@@ -1,6 +1,5 @@
 <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" />
@@ -11,12 +10,10 @@
     <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/H2_Performance_Test.xml

@@ -1,6 +1,5 @@
 <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" />
@@ -11,12 +10,10 @@
     <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

@@ -1,6 +1,5 @@
 <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" />
@@ -11,12 +10,10 @@
     <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>

bramble-android/build.gradle

@@ -1,5 +1,6 @@
 apply plugin: 'com.android.library'
 apply plugin: 'witness'
+apply from: 'witness.gradle'
 
 android {
 	compileSdkVersion 27
@@ -8,8 +9,8 @@ android {
 	defaultConfig {
 		minSdkVersion 14
 		targetSdkVersion 26
-		versionCode 10011
-		versionName "1.0.11"
+		versionCode 10101
+		versionName "1.1.1"
 		consumerProguardFiles 'proguard-rules.txt'
 
 		testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
@@ -27,98 +28,19 @@ configurations {
 
 dependencies {
 	implementation project(path: ':bramble-core', configuration: 'default')
-	implementation 'org.briarproject:jtorctl:0.3'
-	tor 'org.briarproject:tor-android:0.2.9.15@zip'
+	tor 'org.briarproject:tor-android:0.2.9.16@zip'
 
 	annotationProcessor 'com.google.dagger:dagger-compiler:2.0.2'
 
 	compileOnly 'javax.annotation:jsr250-api:1.0'
 
-	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'
-}
-
-dependencyVerification {
-	verify = [
-			'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',
-			'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.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.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:0.2.9.15:tor-android-0.2.9.15.zip:34a6474ee219ffa52e0f3393e917dda6ed03d320b02247d4fa5075aa4094ee6d',
-			'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.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.jvnet.staxex:stax-ex:1.7.7:stax-ex-1.7.7.jar:a31ff7d77163c0deb09e7fee59ad35ae44c2cee2cc8552a116ccd1583d813fb4',
-			'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:5.1:asm-5.1.jar:d2da399a9967c69f0a21739256fa79d284222c223082cacadc17372244764b54',
-	]
+	testImplementation project(path: ':bramble-api', configuration: 'testOutput')
+	testImplementation 'junit:junit:4.12'
+	testImplementation "org.jmock:jmock:2.8.2"
+	testImplementation "org.jmock:jmock-junit4:2.8.2"
+	testImplementation "org.jmock:jmock-legacy:2.8.2"
+	testImplementation "org.hamcrest:hamcrest-library:1.3"
+	testImplementation "org.hamcrest:hamcrest-core:1.3"
 }
 
 project.afterEvaluate {

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

@@ -1,126 +0,0 @@
-package org.briarproject.bramble.plugin.tor;
-
-import android.content.Context;
-import android.support.test.runner.AndroidJUnit4;
-
-import org.briarproject.bramble.DaggerIntegrationTestComponent;
-import org.briarproject.bramble.IntegrationTestComponent;
-import org.briarproject.bramble.api.event.EventBus;
-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.BrambleTestCase;
-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
-	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() {
-		IntegrationTestComponent component =
-				DaggerIntegrationTestComponent.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,
-				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/main/AndroidManifest.xml

@@ -2,14 +2,13 @@
 	package="org.briarproject.bramble"
 	xmlns:android="http://schemas.android.com/apk/res/android">
 
-	<uses-feature android:name="android.hardware.bluetooth"/>
+	<uses-feature android:name="android.hardware.bluetooth" android:required="false"/>
 
 	<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
 	<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
 	<uses-permission android:name="android.permission.BLUETOOTH"/>
 	<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
 	<uses-permission android:name="android.permission.INTERNET"/>
-	<uses-permission android:name="android.permission.READ_LOGS"/>
 	<uses-permission android:name="android.permission.WAKE_LOCK"/>
 
 	<application

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

@@ -1,25 +1,16 @@
 package org.briarproject.bramble;
 
-import android.app.Application;
-
-import org.briarproject.bramble.plugin.tor.CircumventionProvider;
-import org.briarproject.bramble.plugin.tor.CircumventionProviderImpl;
+import org.briarproject.bramble.network.AndroidNetworkModule;
+import org.briarproject.bramble.plugin.tor.CircumventionModule;
 import org.briarproject.bramble.system.AndroidSystemModule;
 
-import javax.inject.Singleton;
-
 import dagger.Module;
-import dagger.Provides;
 
 @Module(includes = {
-		AndroidSystemModule.class
+		AndroidNetworkModule.class,
+		AndroidSystemModule.class,
+		CircumventionModule.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

@@ -0,0 +1,108 @@
+package org.briarproject.bramble.account;
+
+import android.app.Application;
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.preference.PreferenceManager;
+
+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.logging.Logger;
+
+import javax.annotation.Nullable;
+import javax.inject.Inject;
+
+class AndroidAccountManager extends AccountManagerImpl
+		implements AccountManager {
+
+	private static final Logger LOG =
+			Logger.getLogger(AndroidAccountManager.class.getName());
+
+	private static final String PREF_DB_KEY = "key";
+
+	protected final Context appContext;
+	private final SharedPreferences prefs;
+
+	@Inject
+	AndroidAccountManager(DatabaseConfig databaseConfig,
+			CryptoComponent crypto, IdentityManager identityManager,
+			SharedPreferences prefs, Application app) {
+		super(databaseConfig, crypto, identityManager);
+		this.prefs = prefs;
+		appContext = app.getApplicationContext();
+	}
+
+	// Locking: stateChangeLock
+	@Override
+	@Nullable
+	protected String loadEncryptedDatabaseKey() {
+		String key = getDatabaseKeyFromPreferences();
+		if (key == null) key = super.loadEncryptedDatabaseKey();
+		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");
+		}
+	}
+
+	@Override
+	public void deleteAccount() {
+		synchronized (stateChangeLock) {
+			super.deleteAccount();
+			SharedPreferences defaultPrefs = getDefaultSharedPreferences();
+			deleteAppData(prefs, defaultPrefs);
+		}
+	}
+
+	// Package access for testing
+	SharedPreferences getDefaultSharedPreferences() {
+		return PreferenceManager.getDefaultSharedPreferences(appContext);
+	}
+
+	// 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 lib and shared_prefs directories
+		File dataDir = new File(appContext.getApplicationInfo().dataDir);
+		File[] children = dataDir.listFiles();
+		if (children == null) {
+			LOG.warning("Could not list files in app data dir");
+		} else {
+			for (File child : children) {
+				String name = child.getName();
+				if (!name.equals("lib") && !name.equals("shared_prefs")) {
+					IoUtils.deleteFileOrDir(child);
+				}
+			}
+		}
+		// Recreate the cache dir as some OpenGL drivers expect it to exist
+		if (!new File(dataDir, "cache").mkdir())
+			LOG.warning("Could not recreate cache dir");
+	}
+}

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

@@ -0,0 +1,142 @@
+package org.briarproject.bramble.network;
+
+import android.app.Application;
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.net.ConnectivityManager;
+import android.net.NetworkInfo;
+
+import org.briarproject.bramble.api.event.EventBus;
+import org.briarproject.bramble.api.lifecycle.Service;
+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.system.Scheduler;
+
+import java.util.concurrent.Future;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.concurrent.atomic.AtomicReference;
+import java.util.logging.Logger;
+
+import javax.annotation.Nullable;
+import javax.inject.Inject;
+
+import static android.content.Context.CONNECTIVITY_SERVICE;
+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.os.Build.VERSION.SDK_INT;
+import static android.os.PowerManager.ACTION_DEVICE_IDLE_MODE_CHANGED;
+import static java.util.concurrent.TimeUnit.MINUTES;
+import static java.util.concurrent.TimeUnit.SECONDS;
+import static java.util.logging.Level.INFO;
+
+@MethodsNotNullByDefault
+@ParametersNotNullByDefault
+class AndroidNetworkManager implements NetworkManager, Service {
+
+	private static final Logger LOG =
+			Logger.getLogger(AndroidNetworkManager.class.getName());
+
+	// See android.net.wifi.WifiManager
+	private static final String WIFI_AP_STATE_CHANGED_ACTION =
+			"android.net.wifi.WIFI_AP_STATE_CHANGED";
+
+	private final ScheduledExecutorService scheduler;
+	private final EventBus eventBus;
+	private final Context appContext;
+	private final AtomicReference<Future<?>> connectivityCheck =
+			new AtomicReference<>();
+	private final AtomicBoolean used = new AtomicBoolean(false);
+
+	private volatile BroadcastReceiver networkStateReceiver = null;
+
+	@Inject
+	AndroidNetworkManager(@Scheduler ScheduledExecutorService scheduler,
+			EventBus eventBus, Application app) {
+		this.scheduler = scheduler;
+		this.eventBus = eventBus;
+		this.appContext = app.getApplicationContext();
+	}
+
+	@Override
+	public void startService() {
+		if (used.getAndSet(true)) throw new IllegalStateException();
+		// Register to receive network status events
+		networkStateReceiver = new NetworkStateReceiver();
+		IntentFilter filter = new IntentFilter();
+		filter.addAction(CONNECTIVITY_ACTION);
+		filter.addAction(ACTION_SCREEN_ON);
+		filter.addAction(ACTION_SCREEN_OFF);
+		filter.addAction(WIFI_AP_STATE_CHANGED_ACTION);
+		if (SDK_INT >= 23) filter.addAction(ACTION_DEVICE_IDLE_MODE_CHANGED);
+		appContext.registerReceiver(networkStateReceiver, filter);
+
+	}
+
+	@Override
+	public void stopService() {
+		if (networkStateReceiver != null)
+			appContext.unregisterReceiver(networkStateReceiver);
+	}
+
+	@Override
+	public NetworkStatus getNetworkStatus() {
+		ConnectivityManager cm = (ConnectivityManager)
+				appContext.getSystemService(CONNECTIVITY_SERVICE);
+		if (cm == null) throw new AssertionError();
+		NetworkInfo net = cm.getActiveNetworkInfo();
+		boolean connected = net != null && net.isConnected();
+		boolean wifi = connected && net.getType() == TYPE_WIFI;
+		return new NetworkStatus(connected, wifi);
+	}
+
+	private void updateConnectionStatus() {
+		eventBus.broadcast(new NetworkStatusEvent(getNetworkStatus()));
+	}
+
+	private void scheduleConnectionStatusUpdate(int delay, TimeUnit unit) {
+		Future<?> newConnectivityCheck =
+				scheduler.schedule(this::updateConnectionStatus, delay, unit);
+		Future<?> oldConnectivityCheck =
+				connectivityCheck.getAndSet(newConnectivityCheck);
+		if (oldConnectivityCheck != null) oldConnectivityCheck.cancel(false);
+	}
+
+	private class NetworkStateReceiver extends BroadcastReceiver {
+
+		@Override
+		public void onReceive(Context ctx, Intent i) {
+			String action = i.getAction();
+			if (LOG.isLoggable(INFO)) LOG.info("Received broadcast " + action);
+			updateConnectionStatus();
+			if (isSleepOrDozeEvent(action)) {
+				// Allow time for the network to be enabled or disabled
+				scheduleConnectionStatusUpdate(1, MINUTES);
+			} else if (isApEvent(action)) {
+				// The state change may be broadcast before the AP address is
+				// visible, so delay handling the event
+				scheduleConnectionStatusUpdate(5, SECONDS);
+			}
+		}
+
+		private boolean isSleepOrDozeEvent(@Nullable String action) {
+			boolean isSleep = ACTION_SCREEN_ON.equals(action) ||
+					ACTION_SCREEN_OFF.equals(action);
+			boolean isDoze = SDK_INT >= 23 &&
+					ACTION_DEVICE_IDLE_MODE_CHANGED.equals(action);
+			return isSleep || isDoze;
+		}
+
+		private boolean isApEvent(@Nullable String action) {
+			return WIFI_AP_STATE_CHANGED_ACTION.equals(action);
+		}
+	}
+}

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

@@ -0,0 +1,21 @@
+package org.briarproject.bramble.network;
+
+import org.briarproject.bramble.api.lifecycle.LifecycleManager;
+import org.briarproject.bramble.api.network.NetworkManager;
+
+import javax.inject.Singleton;
+
+import dagger.Module;
+import dagger.Provides;
+
+@Module
+public class AndroidNetworkModule {
+
+	@Provides
+	@Singleton
+	NetworkManager provideNetworkManager(LifecycleManager lifecycleManager,
+			AndroidNetworkManager networkManager) {
+		lifecycleManager.registerService(networkManager);
+		return networkManager;
+	}
+}

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

@@ -1,15 +1,16 @@
 package org.briarproject.bramble.plugin.tcp;
 
-import android.content.BroadcastReceiver;
 import android.content.Context;
-import android.content.Intent;
-import android.content.IntentFilter;
 import android.net.ConnectivityManager;
 import android.net.Network;
 import android.net.NetworkInfo;
 import android.net.wifi.WifiInfo;
 import android.net.wifi.WifiManager;
 
+import org.briarproject.bramble.PoliteExecutor;
+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.Backoff;
 import org.briarproject.bramble.api.plugin.duplex.DuplexPluginCallback;
@@ -20,7 +21,6 @@ import java.net.Socket;
 import java.net.UnknownHostException;
 import java.util.Collection;
 import java.util.concurrent.Executor;
-import java.util.concurrent.ScheduledExecutorService;
 import java.util.logging.Logger;
 
 import javax.annotation.Nullable;
@@ -28,21 +28,13 @@ import javax.net.SocketFactory;
 
 import static android.content.Context.CONNECTIVITY_SERVICE;
 import static android.content.Context.WIFI_SERVICE;
-import static android.net.ConnectivityManager.CONNECTIVITY_ACTION;
 import static android.net.ConnectivityManager.TYPE_WIFI;
-import static android.net.wifi.WifiManager.EXTRA_WIFI_STATE;
 import static android.os.Build.VERSION.SDK_INT;
 import static java.util.Collections.emptyList;
 import static java.util.Collections.singletonList;
-import static java.util.concurrent.TimeUnit.SECONDS;
 
 @NotNullByDefault
-class AndroidLanTcpPlugin extends LanTcpPlugin {
-
-	// See android.net.wifi.WifiManager
-	private static final String WIFI_AP_STATE_CHANGED_ACTION =
-			"android.net.wifi.WIFI_AP_STATE_CHANGED";
-	private static final int WIFI_AP_STATE_ENABLED = 13;
+class AndroidLanTcpPlugin extends LanTcpPlugin implements EventListener {
 
 	private static final byte[] WIFI_AP_ADDRESS_BYTES =
 			{(byte) 192, (byte) 168, 43, 1};
@@ -60,22 +52,20 @@ class AndroidLanTcpPlugin extends LanTcpPlugin {
 		}
 	}
 
-	private final ScheduledExecutorService scheduler;
-	private final Context appContext;
+	private final Executor connectionStatusExecutor;
 	private final ConnectivityManager connectivityManager;
 	@Nullable
 	private final WifiManager wifiManager;
 
-	@Nullable
-	private volatile BroadcastReceiver networkStateReceiver = null;
 	private volatile SocketFactory socketFactory;
 
-	AndroidLanTcpPlugin(Executor ioExecutor, ScheduledExecutorService scheduler,
-			Backoff backoff, Context appContext, DuplexPluginCallback callback,
-			int maxLatency, int maxIdleTime) {
+	AndroidLanTcpPlugin(Executor ioExecutor, Context appContext,
+			Backoff backoff, DuplexPluginCallback callback, int maxLatency,
+			int maxIdleTime) {
 		super(ioExecutor, backoff, callback, maxLatency, maxIdleTime);
-		this.scheduler = scheduler;
-		this.appContext = appContext;
+		// 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();
@@ -89,19 +79,12 @@ class AndroidLanTcpPlugin extends LanTcpPlugin {
 	public void start() {
 		if (used.getAndSet(true)) throw new IllegalStateException();
 		running = true;
-		// Register to receive network status events
-		networkStateReceiver = new NetworkStateReceiver();
-		IntentFilter filter = new IntentFilter();
-		filter.addAction(CONNECTIVITY_ACTION);
-		filter.addAction(WIFI_AP_STATE_CHANGED_ACTION);
-		appContext.registerReceiver(networkStateReceiver, filter);
+		updateConnectionStatus();
 	}
 
 	@Override
 	public void stop() {
 		running = false;
-		if (networkStateReceiver != null)
-			appContext.unregisterReceiver(networkStateReceiver);
 		tryToClose(socket);
 	}
 
@@ -120,7 +103,7 @@ class AndroidLanTcpPlugin extends LanTcpPlugin {
 			return singletonList(intToInetAddress(info.getIpAddress()));
 		// If we're running an access point, return its address
 		if (super.getLocalIpAddresses().contains(WIFI_AP_ADDRESS))
-				return singletonList(WIFI_AP_ADDRESS);
+			return singletonList(WIFI_AP_ADDRESS);
 		// No suitable addresses
 		return emptyList();
 	}
@@ -152,21 +135,13 @@ class AndroidLanTcpPlugin extends LanTcpPlugin {
 		return SocketFactory.getDefault();
 	}
 
-	private class NetworkStateReceiver extends BroadcastReceiver {
+	@Override
+	public void eventOccurred(Event e) {
+		if (e instanceof NetworkStatusEvent) updateConnectionStatus();
+	}
 
-		@Override
-		public void onReceive(Context ctx, Intent i) {
-			if (!running) return;
-			if (isApEnabledEvent(i)) {
-				// The state change may be broadcast before the AP address is
-				// visible, so delay handling the event
-				scheduler.schedule(this::handleConnectivityChange, 1, SECONDS);
-			} else {
-				handleConnectivityChange();
-			}
-		}
-
-		private void handleConnectivityChange() {
+	private void updateConnectionStatus() {
+		connectionStatusExecutor.execute(() -> {
 			if (!running) return;
 			Collection<InetAddress> addrs = getLocalIpAddresses();
 			if (addrs.contains(WIFI_AP_ADDRESS)) {
@@ -186,11 +161,6 @@ class AndroidLanTcpPlugin extends LanTcpPlugin {
 				socketFactory = getSocketFactory();
 				if (socket == null || socket.isClosed()) bind();
 			}
-		}
-
-		private boolean isApEnabledEvent(Intent i) {
-			return WIFI_AP_STATE_CHANGED_ACTION.equals(i.getAction()) &&
-					i.getIntExtra(EXTRA_WIFI_STATE, 0) == WIFI_AP_STATE_ENABLED;
-		}
+		});
 	}
-}
+}

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

@@ -2,6 +2,7 @@ package org.briarproject.bramble.plugin.tcp;
 
 import android.content.Context;
 
+import org.briarproject.bramble.api.event.EventBus;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.Backoff;
 import org.briarproject.bramble.api.plugin.BackoffFactory;
@@ -11,7 +12,6 @@ import org.briarproject.bramble.api.plugin.duplex.DuplexPluginCallback;
 import org.briarproject.bramble.api.plugin.duplex.DuplexPluginFactory;
 
 import java.util.concurrent.Executor;
-import java.util.concurrent.ScheduledExecutorService;
 
 import javax.annotation.concurrent.Immutable;
 
@@ -28,15 +28,14 @@ public class AndroidLanTcpPluginFactory implements DuplexPluginFactory {
 	private static final double BACKOFF_BASE = 1.2;
 
 	private final Executor ioExecutor;
-	private final ScheduledExecutorService scheduler;
+	private final EventBus eventBus;
 	private final BackoffFactory backoffFactory;
 	private final Context appContext;
 
-	public AndroidLanTcpPluginFactory(Executor ioExecutor,
-			ScheduledExecutorService scheduler, BackoffFactory backoffFactory,
-			Context appContext) {
+	public AndroidLanTcpPluginFactory(Executor ioExecutor, EventBus eventBus,
+			BackoffFactory backoffFactory, Context appContext) {
 		this.ioExecutor = ioExecutor;
-		this.scheduler = scheduler;
+		this.eventBus = eventBus;
 		this.backoffFactory = backoffFactory;
 		this.appContext = appContext;
 	}
@@ -55,7 +54,9 @@ public class AndroidLanTcpPluginFactory implements DuplexPluginFactory {
 	public DuplexPlugin createPlugin(DuplexPluginCallback callback) {
 		Backoff backoff = backoffFactory.createBackoff(MIN_POLLING_INTERVAL,
 				MAX_POLLING_INTERVAL, BACKOFF_BASE);
-		return new AndroidLanTcpPlugin(ioExecutor, scheduler, backoff,
-				appContext, callback, MAX_LATENCY, MAX_IDLE_TIME);
+		AndroidLanTcpPlugin plugin = new AndroidLanTcpPlugin(ioExecutor,
+				appContext, backoff, callback, MAX_LATENCY, MAX_IDLE_TIME);
+		eventBus.addListener(plugin);
+		return plugin;
 	}
 }

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

@@ -0,0 +1,88 @@
+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.network.NetworkManager;
+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.duplex.DuplexPluginCallback;
+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;
+
+@MethodsNotNullByDefault
+@ParametersNotNullByDefault
+class AndroidTorPlugin extends TorPlugin {
+
+	// This tag may prevent Huawei's power manager from killing us
+	private static final String WAKE_LOCK_TAG = "LocationManagerService";
+
+	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, Backoff backoff,
+			DuplexPluginCallback callback, String architecture, int maxLatency,
+			int maxIdleTime) {
+		super(ioExecutor, networkManager, locationUtils, torSocketFactory,
+				clock, resourceProvider, circumventionProvider, backoff,
+				callback, architecture, maxLatency, maxIdleTime,
+				appContext.getDir("tor", MODE_PRIVATE));
+		this.appContext = appContext;
+		PowerManager pm = (PowerManager)
+				appContext.getSystemService(POWER_SERVICE);
+		assert pm != null;
+		wakeLock = new RenewableWakeLock(pm, scheduler, PARTIAL_WAKE_LOCK,
+				WAKE_LOCK_TAG, 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 (!running) return;
+		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/AndroidTorPluginFactory.java

@@ -4,6 +4,7 @@ import android.content.Context;
 import android.os.Build;
 
 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.Backoff;
 import org.briarproject.bramble.api.plugin.BackoffFactory;
@@ -14,6 +15,7 @@ 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;
@@ -25,10 +27,10 @@ import javax.net.SocketFactory;
 
 @Immutable
 @NotNullByDefault
-public class TorPluginFactory implements DuplexPluginFactory {
+public class AndroidTorPluginFactory implements DuplexPluginFactory {
 
 	private static final Logger LOG =
-			Logger.getLogger(TorPluginFactory.class.getName());
+			Logger.getLogger(AndroidTorPluginFactory.class.getName());
 
 	private static final int MAX_LATENCY = 30 * 1000; // 30 seconds
 	private static final int MAX_IDLE_TIME = 30 * 1000; // 30 seconds
@@ -39,26 +41,30 @@ public class TorPluginFactory implements DuplexPluginFactory {
 	private final Executor ioExecutor;
 	private final ScheduledExecutorService scheduler;
 	private final Context appContext;
+	private final NetworkManager networkManager;
 	private final LocationUtils locationUtils;
 	private final EventBus eventBus;
 	private final SocketFactory torSocketFactory;
 	private final BackoffFactory backoffFactory;
+	private final ResourceProvider resourceProvider;
 	private final CircumventionProvider circumventionProvider;
 	private final Clock clock;
 
-	public TorPluginFactory(Executor ioExecutor,
+	public AndroidTorPluginFactory(Executor ioExecutor,
 			ScheduledExecutorService scheduler, Context appContext,
-			LocationUtils locationUtils, EventBus eventBus,
-			SocketFactory torSocketFactory, BackoffFactory backoffFactory,
-			CircumventionProvider circumventionProvider,
-			Clock clock) {
+			NetworkManager networkManager, LocationUtils locationUtils,
+			EventBus eventBus, SocketFactory torSocketFactory,
+			BackoffFactory backoffFactory, ResourceProvider resourceProvider,
+			CircumventionProvider circumventionProvider, Clock clock) {
 		this.ioExecutor = ioExecutor;
 		this.scheduler = scheduler;
 		this.appContext = appContext;
+		this.networkManager = networkManager;
 		this.locationUtils = locationUtils;
 		this.eventBus = eventBus;
 		this.torSocketFactory = torSocketFactory;
 		this.backoffFactory = backoffFactory;
+		this.resourceProvider = resourceProvider;
 		this.circumventionProvider = circumventionProvider;
 		this.clock = clock;
 	}
@@ -96,9 +102,10 @@ public class TorPluginFactory implements DuplexPluginFactory {
 
 		Backoff backoff = backoffFactory.createBackoff(MIN_POLLING_INTERVAL,
 				MAX_POLLING_INTERVAL, BACKOFF_BASE);
-		TorPlugin plugin = new TorPlugin(ioExecutor, scheduler, appContext,
-				locationUtils, torSocketFactory, clock, backoff, callback,
-				architecture, circumventionProvider, MAX_LATENCY, MAX_IDLE_TIME);
+		AndroidTorPlugin plugin = new AndroidTorPlugin(ioExecutor, scheduler,
+				appContext, networkManager, locationUtils, torSocketFactory,
+				clock, resourceProvider, circumventionProvider, backoff,
+				callback, architecture, MAX_LATENCY, MAX_IDLE_TIME);
 		eventBus.addListener(plugin);
 		return plugin;
 	}

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

@@ -0,0 +1,32 @@
+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/AndroidSystemModule.java

@@ -1,9 +1,8 @@
 package org.briarproject.bramble.system;
 
-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 javax.inject.Singleton;
@@ -16,18 +15,26 @@ public class AndroidSystemModule {
 
 	@Provides
 	@Singleton
-	SecureRandomProvider provideSecureRandomProvider(Application app) {
-		return new AndroidSecureRandomProvider(app);
+	SecureRandomProvider provideSecureRandomProvider(
+			AndroidSecureRandomProvider provider) {
+		return provider;
 	}
 
 	@Provides
-	LocationUtils provideLocationUtils(Application app) {
-		return new AndroidLocationUtils(app);
+	LocationUtils provideLocationUtils(AndroidLocationUtils locationUtils) {
+		return locationUtils;
 	}
 
 	@Provides
 	@Singleton
-	AndroidExecutor provideAndroidExecutor(Application app) {
-		return new AndroidExecutorImpl(app);
+	AndroidExecutor provideAndroidExecutor(
+			AndroidExecutorImpl androidExecutor) {
+		return androidExecutor;
+	}
+
+	@Provides
+	@Singleton
+	ResourceProvider provideResourceProvider(AndroidResourceProvider provider) {
+		return provider;
 	}
 }

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

@@ -3,7 +3,6 @@ package org.briarproject.bramble.util;
 import android.annotation.SuppressLint;
 import android.bluetooth.BluetoothAdapter;
 import android.content.Context;
-import android.content.SharedPreferences;
 import android.os.Build;
 import android.provider.Settings;
 
@@ -58,30 +57,6 @@ public class AndroidUtils {
 				&& !address.equals(FAKE_BLUETOOTH_ADDRESS);
 	}
 
-	public static void deleteAppData(Context ctx, 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 lib and shared_prefs directories
-		File dataDir = new File(ctx.getApplicationInfo().dataDir);
-		File[] children = dataDir.listFiles();
-		if (children == null) {
-			LOG.warning("Could not list files in app data dir");
-		} else {
-			for (File child : children) {
-				String name = child.getName();
-				if (!name.equals("lib") && !name.equals("shared_prefs")) {
-					IoUtils.deleteFileOrDir(child);
-				}
-			}
-		}
-		// Recreate the cache dir as some OpenGL drivers expect it to exist
-		if (!new File(dataDir, "cache").mkdir())
-			LOG.warning("Could not recreate cache dir");
-	}
-
 	public static File getReportDir(Context ctx) {
 		return ctx.getDir(STORED_REPORTS, MODE_PRIVATE);
 	}

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

@@ -0,0 +1,162 @@
+package org.briarproject.bramble.account;
+
+import android.app.Application;
+import android.content.SharedPreferences;
+import android.content.pm.ApplicationInfo;
+
+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.test.BrambleMockTestCase;
+import org.jmock.Expectations;
+import org.jmock.lib.legacy.ClassImposteriser;
+import org.junit.After;
+import org.junit.Before;
+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 {
+
+	private final SharedPreferences prefs =
+			context.mock(SharedPreferences.class, "prefs");
+	private final SharedPreferences defaultPrefs =
+			context.mock(SharedPreferences.class, "defaultPrefs");
+	private final DatabaseConfig databaseConfig =
+			context.mock(DatabaseConfig.class);
+	private final CryptoComponent crypto = context.mock(CryptoComponent.class);
+	private final IdentityManager identityManager =
+			context.mock(IdentityManager.class);
+	private final SharedPreferences.Editor
+			editor = context.mock(SharedPreferences.Editor.class);
+	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;
+
+	public AndroidAccountManagerTest() {
+		context.setImposteriser(ClassImposteriser.INSTANCE);
+		app = context.mock(Application.class);
+		applicationInfo = new ApplicationInfo();
+		applicationInfo.dataDir = testDir.getAbsolutePath();
+	}
+
+	@Before
+	public void setUp() {
+		context.checking(new Expectations() {{
+			allowing(databaseConfig).getDatabaseDirectory();
+			will(returnValue(dbDir));
+			allowing(databaseConfig).getDatabaseKeyDirectory();
+			will(returnValue(keyDir));
+			allowing(app).getApplicationContext();
+			will(returnValue(app));
+		}});
+		accountManager = new AndroidAccountManager(databaseConfig, crypto,
+				identityManager, prefs, app) {
+			@Override
+			SharedPreferences getDefaultSharedPreferences() {
+				return defaultPrefs;
+			}
+		};
+	}
+
+	@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 'lib' and 'shared_prefs' should be spared
+		File libDir = new File(testDir, "lib");
+		File libFile = new File(libDir, "file");
+		File sharedPrefsDir = new File(testDir, "shared_prefs");
+		File sharedPrefsFile = new File(sharedPrefsDir, "file");
+		// Directory 'cache' should be emptied
+		File cacheDir = new File(testDir, "cache");
+		File cacheFile = new File(cacheDir, "file");
+		// Other directories should be deleted
+		File potatoDir = new File(testDir, ".potato");
+		File potatoFile = new File(potatoDir, "file");
+
+		context.checking(new Expectations() {{
+			oneOf(prefs).edit();
+			will(returnValue(editor));
+			oneOf(editor).clear();
+			will(returnValue(editor));
+			oneOf(editor).commit();
+			will(returnValue(true));
+			oneOf(defaultPrefs).edit();
+			will(returnValue(editor));
+			oneOf(editor).clear();
+			will(returnValue(editor));
+			oneOf(editor).commit();
+			will(returnValue(true));
+			oneOf(app).getApplicationInfo();
+			will(returnValue(applicationInfo));
+		}});
+
+		assertTrue(dbDir.mkdirs());
+		assertTrue(keyDir.mkdirs());
+		assertTrue(libDir.mkdirs());
+		assertTrue(libFile.createNewFile());
+		assertTrue(sharedPrefsDir.mkdirs());
+		assertTrue(sharedPrefsFile.createNewFile());
+		assertTrue(cacheDir.mkdirs());
+		assertTrue(cacheFile.createNewFile());
+		assertTrue(potatoDir.mkdirs());
+		assertTrue(potatoFile.createNewFile());
+
+		accountManager.deleteAccount();
+
+		assertFalse(dbDir.exists());
+		assertFalse(keyDir.exists());
+		assertTrue(libDir.exists());
+		assertTrue(libFile.exists());
+		assertTrue(sharedPrefsDir.exists());
+		assertTrue(sharedPrefsFile.exists());
+		assertTrue(cacheDir.exists());
+		assertFalse(cacheFile.exists());
+		assertFalse(potatoDir.exists());
+		assertFalse(potatoFile.exists());
+	}
+
+	@After
+	public void tearDown() {
+		deleteTestDirectory(testDir);
+	}
+}

bramble-android/witness.gradle

@@ -0,0 +1,91 @@
+dependencyVerification {
+    verify = [
+        'cglib:cglib:3.2.0:cglib-3.2.0.jar:adb13bab79712ad6bdf1bd59f2a3918018a8016e722e8a357065afb9e6690861',
+        '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: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',
+    ]
+}

bramble-api/build.gradle

@@ -4,6 +4,7 @@ targetCompatibility = 1.8
 
 apply plugin: 'ru.vyarus.animalsniffer'
 apply plugin: 'witness'
+apply from: 'witness.gradle'
 
 dependencies {
 	implementation "com.google.dagger:dagger:2.0.2"
@@ -19,31 +20,6 @@ dependencies {
 	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/Nameable.java

@@ -0,0 +1,10 @@
+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/UnsupportedVersionException.java

@@ -1,9 +0,0 @@
-package org.briarproject.bramble.api;
-
-import java.io.IOException;
-
-/**
- * An exception that indicates an unrecoverable version mismatch.
- */
-public class UnsupportedVersionException extends IOException {
-}

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

@@ -0,0 +1,70 @@
+package org.briarproject.bramble.api.account;
+
+import org.briarproject.bramble.api.crypto.SecretKey;
+import org.briarproject.bramble.api.identity.IdentityManager;
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+import javax.annotation.Nullable;
+
+@NotNullByDefault
+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 the process exits.
+	 */
+	boolean hasDatabaseKey();
+
+	/**
+	 * Returns the database key if the manager has it. This will be null
+	 * 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 the process exits.
+	 */
+	@Nullable
+	SecretKey getDatabaseKey();
+
+	/**
+	 * 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.
+	 * <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);
+
+	/**
+	 * Deletes all account state from disk. {@link #accountExists()} will
+	 * return false after this method returns.
+	 */
+	void deleteAccount();
+
+	/**
+	 * Loads the encrypted database key from disk and decrypts it with the
+	 * given password.
+	 *
+	 * @return true if the database key was successfully loaded and decrypted.
+	 */
+	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.
+	 *
+	 * @return true if the database key was successfully loaded, re-encrypted
+	 * and stored.
+	 */
+	boolean changePassword(String oldPassword, String newPassword);
+}

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

@@ -16,7 +16,6 @@ import java.util.logging.Logger;
 
 import javax.annotation.concurrent.Immutable;
 
-import static org.briarproject.bramble.api.sync.SyncConstants.MESSAGE_HEADER_LENGTH;
 import static org.briarproject.bramble.api.transport.TransportConstants.MAX_CLOCK_DIFFERENCE;
 
 @Immutable
@@ -49,14 +48,13 @@ 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) {
+		byte[] body = m.getBody();
+		if (body.length == 0) {
 			throw new InvalidMessageException("Message is too short");
 		}
 		try {
-			BdfList body = clientHelper.toList(raw, MESSAGE_HEADER_LENGTH,
-					raw.length - MESSAGE_HEADER_LENGTH);
-			BdfMessageContext result = validateMessage(m, g, body);
+			BdfList bodyList = clientHelper.toList(body);
+			BdfMessageContext result = validateMessage(m, g, bodyList);
 			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

@@ -16,8 +16,6 @@ import org.briarproject.bramble.api.sync.MessageId;
 import java.security.GeneralSecurityException;
 import java.util.Map;
 
-import javax.annotation.Nullable;
-
 @NotNullByDefault
 public interface ClientHelper {
 
@@ -32,16 +30,12 @@ public interface ClientHelper {
 
 	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;
 

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

@@ -16,7 +16,7 @@ public interface ContactManager {
 	/**
 	 * Registers a hook to be called whenever a contact is added or removed.
 	 * This method should be called before
-	 * {@link LifecycleManager#startServices(String)}.
+	 * {@link LifecycleManager#startServices(SecretKey)}.
 	 */
 	void registerContactHook(ContactHook hook);
 

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

@@ -2,6 +2,7 @@ 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.crypto.SecretKey;
 import org.briarproject.bramble.api.identity.Author;
 import org.briarproject.bramble.api.identity.AuthorId;
 import org.briarproject.bramble.api.identity.LocalAuthor;
@@ -44,7 +45,8 @@ public interface DatabaseComponent {
 	 * @throws DataTooOldException if the data uses an older schema than the
 	 * current code and cannot be migrated
 	 */
-	boolean open(@Nullable MigrationListener listener) throws DbException;
+	boolean open(SecretKey key, @Nullable MigrationListener listener)
+			throws DbException;
 
 	/**
 	 * Waits for any open transactions to finish and closes the database.
@@ -149,13 +151,13 @@ public interface DatabaseComponent {
 			throws DbException;
 
 	/**
-	 * Returns a batch of raw messages for the given contact, with a total
-	 * length less than or equal to the given length, for transmission over a
+	 * Returns a batch of messages for the given contact, with a total 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<byte[]> generateBatch(Transaction txn, ContactId c,
+	Collection<Message> generateBatch(Transaction txn, ContactId c,
 			int maxLength, int maxLatency) throws DbException;
 
 	/**
@@ -176,14 +178,14 @@ public interface DatabaseComponent {
 			throws DbException;
 
 	/**
-	 * Returns a batch of raw messages for the given contact, with a total
-	 * length less than or equal to the given length, for transmission over a
+	 * Returns a batch of messages for the given contact, with a total 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<byte[]> generateRequestedBatch(Transaction txn, ContactId c,
+	Collection<Message> generateRequestedBatch(Transaction txn, ContactId c,
 			int maxLength, int maxLatency) throws DbException;
 
 	/**
@@ -261,13 +263,22 @@ public interface DatabaseComponent {
 	 */
 	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.
 	 * <p/>
 	 * Read-only.
 	 */
 	Collection<MessageId> getMessageIds(Transaction txn, GroupId g)
-		throws DbException;
+			throws DbException;
 
 	/**
 	 * Returns the IDs of any messages that need to be validated.
@@ -295,15 +306,6 @@ public interface DatabaseComponent {
 	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/>
@@ -487,7 +489,7 @@ public interface DatabaseComponent {
 	 * Removes the given transport keys from the database.
 	 */
 	void removeTransportKeys(Transaction txn, TransportId t, KeySetId k)
-		throws DbException;
+			throws DbException;
 
 	/**
 	 * Marks the given contact as verified.
@@ -534,7 +536,7 @@ public interface DatabaseComponent {
 	 * Marks the given transport keys as usable for outgoing streams.
 	 */
 	void setTransportKeysActive(Transaction txn, TransportId t, KeySetId k)
-		throws DbException;
+			throws DbException;
 
 	/**
 	 * Stores the given transport keys, deleting any keys they have replaced.

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

@@ -1,30 +1,15 @@
 package org.briarproject.bramble.api.db;
 
-import org.briarproject.bramble.api.crypto.SecretKey;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 
 import java.io.File;
 
-import javax.annotation.Nullable;
-
 @NotNullByDefault
 public interface DatabaseConfig {
 
-	boolean databaseExists();
-
 	File getDatabaseDirectory();
 
 	File getDatabaseKeyDirectory();
 
-	void setEncryptionKey(SecretKey key);
-
-	@Nullable
-	SecretKey getEncryptionKey();
-
-	void setLocalAuthorName(String nickname);
-
-	@Nullable
-	String getLocalAuthorName();
-
 	long getMaxSize();
 }

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

@@ -0,0 +1,9 @@
+package org.briarproject.bramble.api.db;
+
+/**
+ * Thrown when a message that has been deleted is requested from the database.
+ * This exception may occur due to concurrent updates and does not indicate a
+ * database error.
+ */
+public class MessageDeletedException extends DbException {
+}

bramble-api/src/main/java/org/briarproject/bramble/api/identity/Author.java

@@ -1,5 +1,6 @@
 package org.briarproject.bramble.api.identity;
 
+import org.briarproject.bramble.api.Nameable;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.util.StringUtils;
 
@@ -13,7 +14,7 @@ import static org.briarproject.bramble.api.identity.AuthorConstants.MAX_PUBLIC_K
  */
 @Immutable
 @NotNullByDefault
-public class Author {
+public class Author implements Nameable {
 
 	public enum Status {
 		NONE, ANONYMOUS, UNKNOWN, UNVERIFIED, VERIFIED, OURSELVES

bramble-api/src/main/java/org/briarproject/bramble/api/identity/IdentityManager.java

@@ -1,5 +1,6 @@
 package org.briarproject.bramble.api.identity;
 
+import org.briarproject.bramble.api.crypto.CryptoExecutor;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.db.Transaction;
 import org.briarproject.bramble.api.identity.Author.Status;
@@ -9,29 +10,40 @@ import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 public interface IdentityManager {
 
 	/**
-	 * Stores the local pseudonym.
+	 * Creates a local identity with the given name.
 	 */
-	void registerLocalAuthor(LocalAuthor a) throws DbException;
+	@CryptoExecutor
+	LocalAuthor createLocalAuthor(String name);
 
 	/**
-	 * Returns the cached main local identity, non-blocking, or loads it from
-	 * the db, blocking
+	 * Registers the given local identity with the manager. The identity is
+	 * not stored until {@link #storeLocalAuthor()} is called.
+	 */
+	void registerLocalAuthor(LocalAuthor a);
+
+	/**
+	 * Stores the local identity registered with
+	 * {@link #registerLocalAuthor(LocalAuthor)}, if any.
+	 */
+	void storeLocalAuthor() throws DbException;
+
+	/**
+	 * Returns the cached local identity or loads it from the database.
 	 */
 	LocalAuthor getLocalAuthor() throws DbException;
 
 	/**
-	 * Returns the cached main local identity, non-blocking, or loads it from
-	 * the db, blocking, within the given Transaction.
+	 * Returns the cached local identity or loads it from the database.
 	 */
 	LocalAuthor getLocalAuthor(Transaction txn) throws DbException;
 
 	/**
-	 * Returns the trust-level status of the author
+	 * Returns the {@link Status} of the given author.
 	 */
 	Status getAuthorStatus(AuthorId a) throws DbException;
 
 	/**
-	 * Returns the trust-level status of the author
+	 * Returns the {@link Status} of the given author.
 	 */
 	Status getAuthorStatus(Transaction txn, AuthorId a) throws DbException;
 

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

@@ -3,20 +3,16 @@ package org.briarproject.bramble.api.keyagreement;
 public interface KeyAgreementConstants {
 
 	/**
-	 * The current version of the BQP protocol. Version number 89 is reserved.
+	 * The version of the BQP protocol used in beta releases. This version
+	 * number is reserved.
+	 */
+	byte BETA_PROTOCOL_VERSION = 89;
+
+	/**
+	 * The current version of the BQP protocol.
 	 */
 	byte PROTOCOL_VERSION = 4;
 
-	/**
-	 * The length of the record header in bytes.
-	 */
-	int RECORD_HEADER_LENGTH = 4;
-
-	/**
-	 * The offset of the payload length in the record header, in bytes.
-	 */
-	int RECORD_HEADER_PAYLOAD_LENGTH_OFFSET = 2;
-
 	/**
 	 * The length of the BQP key commitment in bytes.
 	 */

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

@@ -0,0 +1,20 @@
+package org.briarproject.bramble.api.keyagreement;
+
+import java.io.IOException;
+
+/**
+ * Thrown when a QR code that has been scanned uses a protocol version that is
+ * not supported.
+ */
+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/lifecycle/LifecycleManager.java

@@ -1,13 +1,12 @@
 package org.briarproject.bramble.api.lifecycle;
 
+import org.briarproject.bramble.api.crypto.SecretKey;
 import org.briarproject.bramble.api.db.DatabaseComponent;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.sync.Client;
 
 import java.util.concurrent.ExecutorService;
 
-import javax.annotation.Nullable;
-
 /**
  * Manages the lifecycle of the app, starting {@link Client Clients}, starting
  * and stopping {@link Service Services}, shutting down
@@ -18,7 +17,7 @@ import javax.annotation.Nullable;
 public interface LifecycleManager {
 
 	/**
-	 * The result of calling {@link #startServices(String)}.
+	 * The result of calling {@link #startServices(SecretKey)}.
 	 */
 	enum StartResult {
 		ALREADY_RUNNING,
@@ -44,28 +43,27 @@ public interface LifecycleManager {
 
 	/**
 	 * Registers a {@link Service} to be started and stopped. This method
-	 * should be called before {@link #startServices(String)}.
+	 * should be called before {@link #startServices(SecretKey)}.
 	 */
 	void registerService(Service s);
 
 	/**
 	 * Registers a {@link Client} to be started. This method should be called
-	 * before {@link #startServices(String)}.
+	 * before {@link #startServices(SecretKey)}.
 	 */
 	void registerClient(Client c);
 
 	/**
 	 * Registers an {@link ExecutorService} to be shut down. This method
-	 * should be called before {@link #startServices(String)}.
+	 * should be called before {@link #startServices(SecretKey)}.
 	 */
 	void registerForShutdown(ExecutorService e);
 
 	/**
-	 * Opens the {@link DatabaseComponent}, optionally creates a local author
-	 * with the provided nickname, and starts any registered
-	 * {@link Client Clients} and {@link Service Services}.
+	 * Opens the {@link DatabaseComponent} using the given key and starts any
+	 * registered {@link Client Clients} and {@link Service Services}.
 	 */
-	StartResult startServices(@Nullable String nickname);
+	StartResult startServices(SecretKey dbKey);
 
 	/**
 	 * Stops any registered {@link Service Services}, shuts down any

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

@@ -0,0 +1,9 @@
+package org.briarproject.bramble.api.network;
+
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+@NotNullByDefault
+public interface NetworkManager {
+
+	NetworkStatus getNetworkStatus();
+}

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

@@ -0,0 +1,25 @@
+package org.briarproject.bramble.api.network;
+
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+import javax.annotation.concurrent.Immutable;
+
+@Immutable
+@NotNullByDefault
+public class NetworkStatus {
+
+	private final boolean connected, wifi;
+
+	public NetworkStatus(boolean connected, boolean wifi) {
+		this.connected = connected;
+		this.wifi = wifi;
+	}
+
+	public boolean isConnected() {
+		return connected;
+	}
+
+	public boolean isWifi() {
+		return wifi;
+	}
+}

bramble-api/src/main/java/org/briarproject/bramble/api/network/event/NetworkStatusEvent.java

@@ -0,0 +1,22 @@
+package org.briarproject.bramble.api.network.event;
+
+import org.briarproject.bramble.api.event.Event;
+import org.briarproject.bramble.api.network.NetworkStatus;
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+import javax.annotation.concurrent.Immutable;
+
+@Immutable
+@NotNullByDefault
+public class NetworkStatusEvent extends Event {
+
+	private final NetworkStatus status;
+
+	public NetworkStatusEvent(NetworkStatus status) {
+		this.status = status;
+	}
+
+	public NetworkStatus getStatus() {
+		return status;
+	}
+}

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

@@ -12,11 +12,13 @@ public interface TorConstants {
 	int CONNECT_TO_PROXY_TIMEOUT = 5000; // Milliseconds
 	int EXTRA_SOCKET_TIMEOUT = 30000; // Milliseconds
 
-	String PREF_TOR_NETWORK = "network";
+	String PREF_TOR_NETWORK = "network2";
 	String PREF_TOR_PORT = "port";
+	String PREF_TOR_MOBILE = "useMobileData";
 
-	int PREF_TOR_NETWORK_NEVER = 0;
-	int PREF_TOR_NETWORK_WIFI = 1;
-	int PREF_TOR_NETWORK_ALWAYS = 2;
+	int PREF_TOR_NETWORK_AUTOMATIC = 0;
+	int PREF_TOR_NETWORK_WITHOUT_BRIDGES = 1;
+	int PREF_TOR_NETWORK_WITH_BRIDGES = 2;
+	int PREF_TOR_NETWORK_NEVER = 3;
 
 }

bramble-api/src/main/java/org/briarproject/bramble/api/settings/SettingsManager.java

@@ -1,6 +1,7 @@
 package org.briarproject.bramble.api.settings;
 
 import org.briarproject.bramble.api.db.DbException;
+import org.briarproject.bramble.api.db.Transaction;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 
 @NotNullByDefault
@@ -11,6 +12,11 @@ public interface SettingsManager {
 	 */
 	Settings getSettings(String namespace) throws DbException;
 
+	/**
+	 * Returns all settings in the given namespace.
+	 */
+	Settings getSettings(Transaction txn, String namespace) throws DbException;
+
 	/**
 	 * Merges the given settings with any existing settings in the given
 	 * namespace.

bramble-api/src/main/java/org/briarproject/bramble/api/settings/event/SettingsUpdatedEvent.java

@@ -2,6 +2,7 @@ package org.briarproject.bramble.api.settings.event;
 
 import org.briarproject.bramble.api.event.Event;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.api.settings.Settings;
 
 import javax.annotation.concurrent.Immutable;
 
@@ -13,12 +14,18 @@ import javax.annotation.concurrent.Immutable;
 public class SettingsUpdatedEvent extends Event {
 
 	private final String namespace;
+	private final Settings settings;
 
-	public SettingsUpdatedEvent(String namespace) {
+	public SettingsUpdatedEvent(String namespace, Settings settings) {
 		this.namespace = namespace;
+		this.settings = settings;
 	}
 
 	public String getNamespace() {
 		return namespace;
 	}
+
+	public Settings getSettings() {
+		return settings;
+	}
 }

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

@@ -1,6 +1,6 @@
 package org.briarproject.bramble.api.sync;
 
-import static org.briarproject.bramble.api.sync.SyncConstants.MAX_MESSAGE_LENGTH;
+import static org.briarproject.bramble.api.sync.SyncConstants.MAX_MESSAGE_BODY_LENGTH;
 import static org.briarproject.bramble.api.sync.SyncConstants.MESSAGE_HEADER_LENGTH;
 
 public class Message {
@@ -13,17 +13,15 @@ public class Message {
 	private final MessageId id;
 	private final GroupId groupId;
 	private final long timestamp;
-	private final byte[] raw;
+	private final byte[] body;
 
-	public Message(MessageId id, GroupId groupId, long timestamp, byte[] raw) {
-		if (raw.length <= MESSAGE_HEADER_LENGTH)
-			throw new IllegalArgumentException();
-		if (raw.length > MAX_MESSAGE_LENGTH)
+	public Message(MessageId id, GroupId groupId, long timestamp, byte[] body) {
+		if (body.length > MAX_MESSAGE_BODY_LENGTH)
 			throw new IllegalArgumentException();
 		this.id = id;
 		this.groupId = groupId;
 		this.timestamp = timestamp;
-		this.raw = raw;
+		this.body = body;
 	}
 
 	/**
@@ -50,15 +48,15 @@ public class Message {
 	/**
 	 * Returns the length of the raw message in bytes.
 	 */
-	public int getLength() {
-		return raw.length;
+	public int getRawLength() {
+		return MESSAGE_HEADER_LENGTH + body.length;
 	}
 
 	/**
-	 * Returns the raw message.
+	 * Returns the message body.
 	 */
-	public byte[] getRaw() {
-		return raw;
+	public byte[] getBody() {
+		return body;
 	}
 
 	@Override

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

@@ -9,5 +9,5 @@ public interface MessageFactory {
 
 	Message createMessage(byte[] raw);
 
-	Message createMessage(MessageId m, byte[] raw);
+	byte[] getRawMessage(Message m);
 }

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

@@ -9,7 +9,7 @@ public interface SyncRecordWriter {
 
 	void writeAck(Ack a) throws IOException;
 
-	void writeMessage(byte[] raw) throws IOException;
+	void writeMessage(Message m) throws IOException;
 
 	void writeOffer(Offer o) throws IOException;
 

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

@@ -1,5 +1,6 @@
 package org.briarproject.bramble.api.sync;
 
+import org.briarproject.bramble.api.crypto.SecretKey;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.db.Metadata;
 import org.briarproject.bramble.api.db.Transaction;
@@ -35,7 +36,8 @@ public interface ValidationManager {
 
 	/**
 	 * Registers the message validator for the given client. This method
-	 * should be called before {@link LifecycleManager#startServices(String)}.
+	 * should be called before
+	 * {@link LifecycleManager#startServices(SecretKey)}.
 	 */
 	void registerMessageValidator(ClientId c, int majorVersion,
 			MessageValidator v);
@@ -44,7 +46,7 @@ public interface ValidationManager {
 	 * Registers the incoming message hook for the given client. The hook will
 	 * be called once for each incoming message that passes validation. This
 	 * method should be called before
-	 * {@link LifecycleManager#startServices(String)}.
+	 * {@link LifecycleManager#startServices(SecretKey)}.
 	 */
 	void registerIncomingMessageHook(ClientId c, int majorVersion,
 			IncomingMessageHook hook);

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

@@ -0,0 +1,11 @@
+package org.briarproject.bramble.api.system;
+
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+import java.io.InputStream;
+
+@NotNullByDefault
+public interface ResourceProvider {
+
+	InputStream getResourceInputStream(String name, String extension);
+}

bramble-api/src/main/java/org/briarproject/bramble/api/versioning/ClientVersioningManager.java

@@ -2,6 +2,7 @@ package org.briarproject.bramble.api.versioning;
 
 import org.briarproject.bramble.api.contact.Contact;
 import org.briarproject.bramble.api.contact.ContactId;
+import org.briarproject.bramble.api.crypto.SecretKey;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.db.Transaction;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager;
@@ -25,7 +26,7 @@ public interface ClientVersioningManager {
 	/**
 	 * Registers a client that will be advertised to contacts. The hook will
 	 * be called when the visibility of the client changes. This method should
-	 * be called before {@link LifecycleManager#startServices(String)}.
+	 * be called before {@link LifecycleManager#startServices(SecretKey)}.
 	 */
 	void registerClient(ClientId clientId, int majorVersion, int minorVersion,
 			ClientVersioningHook hook);

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

@@ -153,4 +153,15 @@ public class StringUtils {
 		return new String(c);
 	}
 
+
+	public static String getRandomBase32String(int length) {
+		char[] c = new char[length];
+		for (int i = 0; i < length; i++) {
+			int character = random.nextInt(32);
+			if (character < 26) c[i] = (char) ('A' + character);
+			else c[i] = (char) ('2' + (character - 26));
+		}
+		return new String(c);
+	}
+
 }

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

@@ -0,0 +1,23 @@
+package org.briarproject.bramble.test;
+
+import org.briarproject.bramble.api.system.Clock;
+
+public class ArrayClock implements Clock {
+
+	private final long[] times;
+	private int index = 0;
+
+	public ArrayClock(long... times) {
+		this.times = times;
+	}
+
+	@Override
+	public long currentTimeMillis() {
+		return times[index++];
+	}
+
+	@Override
+	public void sleep(long milliseconds) throws InterruptedException {
+		Thread.sleep(milliseconds);
+	}
+}

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

@@ -24,6 +24,7 @@ import java.util.Map;
 import java.util.Random;
 import java.util.concurrent.atomic.AtomicInteger;
 
+import static java.util.Arrays.asList;
 import static org.briarproject.bramble.api.identity.Author.FORMAT_VERSION;
 import static org.briarproject.bramble.api.identity.AuthorConstants.MAX_AUTHOR_NAME_LENGTH;
 import static org.briarproject.bramble.api.identity.AuthorConstants.MAX_PUBLIC_KEY_LENGTH;
@@ -32,7 +33,6 @@ import static org.briarproject.bramble.api.properties.TransportPropertyConstants
 import static org.briarproject.bramble.api.sync.ClientId.MAX_CLIENT_ID_LENGTH;
 import static org.briarproject.bramble.api.sync.SyncConstants.MAX_GROUP_DESCRIPTOR_LENGTH;
 import static org.briarproject.bramble.api.sync.SyncConstants.MAX_MESSAGE_BODY_LENGTH;
-import static org.briarproject.bramble.api.sync.SyncConstants.MESSAGE_HEADER_LENGTH;
 import static org.briarproject.bramble.util.StringUtils.getRandomString;
 
 public class TestUtils {
@@ -40,6 +40,7 @@ public class TestUtils {
 	private static final AtomicInteger nextTestDir =
 			new AtomicInteger((int) (Math.random() * 1000 * 1000));
 	private static final Random random = new Random();
+	private static final long timestamp = System.currentTimeMillis();
 
 	public static File getTestDirectory() {
 		int name = nextTestDir.getAndIncrement();
@@ -101,9 +102,8 @@ public class TestUtils {
 		String name = getRandomString(nameLength);
 		byte[] publicKey = getRandomBytes(MAX_PUBLIC_KEY_LENGTH);
 		byte[] privateKey = getRandomBytes(MAX_PUBLIC_KEY_LENGTH);
-		long created = System.currentTimeMillis();
 		return new LocalAuthor(id, FORMAT_VERSION, name, publicKey, privateKey,
-				created);
+				timestamp);
 	}
 
 	public static Author getAuthor() {
@@ -131,14 +131,13 @@ public class TestUtils {
 
 	public static Message getMessage(GroupId groupId) {
 		int bodyLength = 1 + random.nextInt(MAX_MESSAGE_BODY_LENGTH);
-		return getMessage(groupId, MESSAGE_HEADER_LENGTH + bodyLength);
+		return getMessage(groupId, bodyLength);
 	}
 
-	public static Message getMessage(GroupId groupId, int rawLength) {
+	public static Message getMessage(GroupId groupId, int bodyLength) {
 		MessageId id = new MessageId(getRandomId());
-		byte[] raw = getRandomBytes(rawLength);
-		long timestamp = System.currentTimeMillis();
-		return new Message(id, groupId, timestamp, raw);
+		byte[] body = getRandomBytes(bodyLength);
+		return new Message(id, groupId, timestamp, body);
 	}
 
 	public static double getMedian(Collection<? extends Number> samples) {
@@ -174,4 +173,10 @@ public class TestUtils {
 			Collection<? extends Number> samples) {
 		return Math.sqrt(getVariance(samples));
 	}
+
+	public static boolean isOptionalTestEnabled(Class testClass) {
+		String optionalTests = System.getenv("OPTIONAL_TESTS");
+		return optionalTests != null &&
+				asList(optionalTests.split(",")).contains(testClass.getName());
+	}
 }

bramble-api/witness.gradle

@@ -0,0 +1,24 @@
+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',
+    ]
+}

bramble-core/build.gradle

@@ -6,6 +6,7 @@ apply plugin: 'ru.vyarus.animalsniffer'
 apply plugin: 'net.ltgt.apt'
 apply plugin: 'idea'
 apply plugin: 'witness'
+apply from: 'witness.gradle'
 
 dependencies {
 	implementation project(path: ':bramble-api', configuration: 'default')
@@ -14,6 +15,7 @@ dependencies {
 	implementation 'org.bitlet:weupnp:0.1.4'
 	implementation 'net.i2p.crypto:eddsa:0.2.0'
 	implementation 'org.whispersystems:curve25519-java:0.4.1'
+	implementation 'org.briarproject:jtorctl:0.3'
 
 	apt 'com.google.dagger:dagger-compiler:2.0.2'
 
@@ -31,40 +33,7 @@ dependencies {
 	signature 'org.codehaus.mojo.signature:java16:1.1@signature'
 }
 
-dependencyVerification {
-	verify = [
-			'cglib:cglib:3.2.0:cglib-3.2.0.jar:adb13bab79712ad6bdf1bd59f2a3918018a8016e722e8a357065afb9e6690861',
-			'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.guava:guava:18.0:guava-18.0.jar:d664fbfc03d2e5ce9cab2a44fb01f1d0bf9dfebeccc1a473b1f9ea31f79f6f99',
-			'com.h2database:h2:1.4.192:h2-1.4.192.jar:225b22e9857235c46c93861410b60b8c81c10dc8985f4faf188985ba5445126c',
-			'com.madgag.spongycastle:core:1.58.0.0:core-1.58.0.0.jar:199617dd5698c5a9312b898c0a4cec7ce9dd8649d07f65d91629f58229d72728',
-			'javax.inject:javax.inject:1:javax.inject-1.jar:91c77044a50c481636c32d916fd89c9118a72195390452c81065080f957de7ff',
-			'junit:junit:4.12:junit-4.12.jar:59721f0805e223d84b90677887d9ff567dc534d7c502ca903c0c2b17f05c116a',
-			'net.i2p.crypto:eddsa:0.2.0:eddsa-0.2.0.jar:a7cb1b85c16e2f0730b9204106929a1d9aaae1df728adc7041a8b8b605692140',
-			'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.bitlet:weupnp:0.1.4:weupnp-0.1.4.jar:88df7e6504929d00bdb832863761385c68ab92af945b04f0770b126270a444fb',
-			'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.hsqldb:hsqldb:2.3.5:hsqldb-2.3.5.jar:6676a6977ac98997a80f827ddbd3fe8ca1e0853dad1492512135fd1a222ccfad',
-			'org.jmock:jmock-junit4:2.8.2:jmock-junit4-2.8.2.jar:f7ee4df4f7bd7b7f1cafad3b99eb74d579f109d5992ff625347352edb55e674c',
-			'org.jmock:jmock-legacy:2.8.2:jmock-legacy-2.8.2.jar:f2b985a5c08a9edb7f37612330c058809da3f6a6d63ce792426ebf8ff0d6d31b',
-			'org.jmock:jmock-testjar:2.8.2:jmock-testjar-2.8.2.jar:8900860f72c474e027cf97fe78dcbf154a1aa7fc62b6845c5fb4e4f3c7bc8760',
-			'org.jmock:jmock:2.8.2:jmock-2.8.2.jar:6c73cb4a2e6dbfb61fd99c9a768539c170ab6568e57846bd60dbf19596b65b16',
-			'org.objenesis:objenesis:2.1:objenesis-2.1.jar:c74330cc6b806c804fd37e74487b4fe5d7c2750c5e15fbc6efa13bdee1bdef80',
-			'org.ow2.asm:asm-all:5.2:asm-all-5.2.jar:7fbffbc1db3422e2101689fd88df8384b15817b52b9b2b267b9f6d2511dc198d',
-			'org.ow2.asm:asm:5.0.4:asm-5.0.4.jar:896618ed8ae62702521a78bc7be42b7c491a08e6920a15f89a3ecdec31e9a220',
-			'org.whispersystems:curve25519-java:0.4.1:curve25519-java-0.4.1.jar:7dd659d8822c06c3aea1a47f18fac9e5761e29cab8100030b877db445005f03e',
-	]
-}
-
-// needed to make test output available to bramble-j2se
+// needed to make test output available to bramble-java
 configurations {
 	testOutput.extendsFrom(testCompile)
 }

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

@@ -0,0 +1,222 @@
+package org.briarproject.bramble.account;
+
+import org.briarproject.bramble.api.account.AccountManager;
+import org.briarproject.bramble.api.crypto.CryptoComponent;
+import org.briarproject.bramble.api.crypto.SecretKey;
+import org.briarproject.bramble.api.db.DatabaseConfig;
+import org.briarproject.bramble.api.identity.IdentityManager;
+import org.briarproject.bramble.api.identity.LocalAuthor;
+import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
+import org.briarproject.bramble.util.IoUtils;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.logging.Logger;
+
+import javax.annotation.Nullable;
+import javax.inject.Inject;
+
+import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
+import static org.briarproject.bramble.util.StringUtils.fromHexString;
+import static org.briarproject.bramble.util.StringUtils.toHexString;
+
+@MethodsNotNullByDefault
+@ParametersNotNullByDefault
+class AccountManagerImpl implements AccountManager {
+
+	private static final Logger LOG =
+			Logger.getLogger(AccountManagerImpl.class.getName());
+
+	private static final String DB_KEY_FILENAME = "db.key";
+	private static final String DB_KEY_BACKUP_FILENAME = "db.key.bak";
+
+	private final DatabaseConfig databaseConfig;
+	private final CryptoComponent crypto;
+	private final IdentityManager identityManager;
+	private final File dbKeyFile, dbKeyBackupFile;
+
+	final Object stateChangeLock = new Object();
+
+	@Nullable
+	private volatile SecretKey databaseKey = null;
+
+	@Inject
+	AccountManagerImpl(DatabaseConfig databaseConfig, CryptoComponent crypto,
+			IdentityManager identityManager) {
+		this.databaseConfig = databaseConfig;
+		this.crypto = crypto;
+		this.identityManager = identityManager;
+		File keyDir = databaseConfig.getDatabaseKeyDirectory();
+		dbKeyFile = new File(keyDir, DB_KEY_FILENAME);
+		dbKeyBackupFile = new File(keyDir, DB_KEY_BACKUP_FILENAME);
+	}
+
+	@Override
+	public boolean hasDatabaseKey() {
+		return databaseKey != null;
+	}
+
+	@Override
+	@Nullable
+	public SecretKey getDatabaseKey() {
+		return databaseKey;
+	}
+
+	// Locking: stateChangeLock
+	@Nullable
+	protected String loadEncryptedDatabaseKey() {
+		String key = readDbKeyFromFile(dbKeyFile);
+		if (key == null) {
+			LOG.info("No database key in primary file");
+			key = readDbKeyFromFile(dbKeyBackupFile);
+			if (key == null) LOG.info("No database key in backup file");
+			else LOG.warning("Found database key in backup file");
+		} else {
+			LOG.info("Found database key in primary file");
+		}
+		return key;
+	}
+
+	// Locking: stateChangeLock
+	@Nullable
+	private String readDbKeyFromFile(File f) {
+		if (!f.exists()) {
+			LOG.info("Key file does not exist");
+			return null;
+		}
+		try {
+			BufferedReader reader = new BufferedReader(new InputStreamReader(
+					new FileInputStream(f), "UTF-8"));
+			String key = reader.readLine();
+			reader.close();
+			return key;
+		} catch (IOException e) {
+			logException(LOG, WARNING, e);
+			return null;
+		}
+	}
+
+	// Locking: stateChangeLock
+	protected boolean storeEncryptedDatabaseKey(String hex) {
+		LOG.info("Storing database key in file");
+		// Create the directory if necessary
+		if (databaseConfig.getDatabaseKeyDirectory().mkdirs())
+			LOG.info("Created database key directory");
+		// If only the backup file exists, rename it so we don't overwrite it
+		if (dbKeyBackupFile.exists() && !dbKeyFile.exists()) {
+			if (dbKeyBackupFile.renameTo(dbKeyFile))
+				LOG.info("Renamed old backup");
+			else LOG.warning("Failed to rename old backup");
+		}
+		try {
+			// Write to the backup file
+			writeDbKeyToFile(hex, dbKeyBackupFile);
+			LOG.info("Stored database key in backup file");
+			// Delete the old primary file, if it exists
+			if (dbKeyFile.exists()) {
+				if (dbKeyFile.delete()) LOG.info("Deleted primary file");
+				else LOG.warning("Failed to delete primary file");
+			}
+			// The backup file becomes the new primary
+			if (dbKeyBackupFile.renameTo(dbKeyFile)) {
+				LOG.info("Renamed backup file to primary");
+			} else {
+				LOG.warning("Failed to rename backup file to primary");
+				return false; // Don't overwrite our only copy
+			}
+			// Write a second copy to the backup file
+			writeDbKeyToFile(hex, dbKeyBackupFile);
+			LOG.info("Stored second copy of database key in backup file");
+			return true;
+		} catch (IOException e) {
+			logException(LOG, WARNING, e);
+			return false;
+		}
+	}
+
+	// Locking: stateChangeLock
+	private void writeDbKeyToFile(String key, File f) throws IOException {
+		FileOutputStream out = new FileOutputStream(f);
+		out.write(key.getBytes("UTF-8"));
+		out.flush();
+		out.close();
+	}
+
+	@Override
+	public boolean accountExists() {
+		synchronized (stateChangeLock) {
+			return loadEncryptedDatabaseKey() != null
+					&& databaseConfig.getDatabaseDirectory().isDirectory();
+		}
+	}
+
+	@Override
+	public boolean createAccount(String name, String password) {
+		synchronized (stateChangeLock) {
+			// TODO don't allow creating another account if one already exists
+			LocalAuthor localAuthor = identityManager.createLocalAuthor(name);
+			identityManager.registerLocalAuthor(localAuthor);
+			SecretKey key = crypto.generateSecretKey();
+			if (!encryptAndStoreDatabaseKey(key, password)) return false;
+			databaseKey = key;
+			return true;
+		}
+	}
+
+	// Locking: stateChangeLock
+	private boolean encryptAndStoreDatabaseKey(SecretKey key, String password) {
+		byte[] plaintext = key.getBytes();
+		byte[] ciphertext = crypto.encryptWithPassword(plaintext, password);
+		return storeEncryptedDatabaseKey(toHexString(ciphertext));
+	}
+
+	@Override
+	public void deleteAccount() {
+		synchronized (stateChangeLock) {
+			LOG.info("Deleting account");
+			IoUtils.deleteFileOrDir(databaseConfig.getDatabaseKeyDirectory());
+			IoUtils.deleteFileOrDir(databaseConfig.getDatabaseDirectory());
+		}
+	}
+
+	@Override
+	public boolean signIn(String password) {
+		synchronized (stateChangeLock) {
+			SecretKey key = loadAndDecryptDatabaseKey(password);
+			if (key == null) return false;
+			databaseKey = key;
+			return true;
+		}
+	}
+
+	// Locking: stateChangeLock
+	@Nullable
+	private SecretKey loadAndDecryptDatabaseKey(String password) {
+		String hex = loadEncryptedDatabaseKey();
+		if (hex == null) {
+			LOG.warning("Failed to load encrypted database key");
+			return null;
+		}
+		byte[] ciphertext = fromHexString(hex);
+		byte[] plaintext = crypto.decryptWithPassword(ciphertext, password);
+		if (plaintext == null) {
+			LOG.info("Failed to decrypt database key");
+			return null;
+		}
+		return new SecretKey(plaintext);
+	}
+
+	@Override
+	public boolean changePassword(String oldPassword, String newPassword) {
+		synchronized (stateChangeLock) {
+			SecretKey key = loadAndDecryptDatabaseKey(oldPassword);
+			return key != null && encryptAndStoreDatabaseKey(key, newPassword);
+		}
+	}
+}

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

@@ -0,0 +1,18 @@
+package org.briarproject.bramble.account;
+
+import org.briarproject.bramble.api.account.AccountManager;
+
+import javax.inject.Singleton;
+
+import dagger.Module;
+import dagger.Provides;
+
+@Module
+public class AccountModule {
+
+	@Provides
+	@Singleton
+	AccountManager provideAccountManager(AccountManagerImpl accountManager) {
+		return accountManager;
+	}
+}

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

@@ -41,7 +41,6 @@ import static org.briarproject.bramble.api.identity.AuthorConstants.MAX_AUTHOR_N
 import static org.briarproject.bramble.api.identity.AuthorConstants.MAX_PUBLIC_KEY_LENGTH;
 import static org.briarproject.bramble.api.properties.TransportPropertyConstants.MAX_PROPERTIES_PER_TRANSPORT;
 import static org.briarproject.bramble.api.properties.TransportPropertyConstants.MAX_PROPERTY_LENGTH;
-import static org.briarproject.bramble.api.sync.SyncConstants.MESSAGE_HEADER_LENGTH;
 import static org.briarproject.bramble.util.ValidationUtils.checkLength;
 import static org.briarproject.bramble.util.ValidationUtils.checkSize;
 
@@ -127,9 +126,7 @@ class ClientHelperImpl implements ClientHelper {
 
 	@Override
 	public Message getMessage(Transaction txn, MessageId m) throws DbException {
-		byte[] raw = db.getRawMessage(txn, m);
-		if (raw == null) return null;
-		return messageFactory.createMessage(m, raw);
+		return db.getMessage(txn, m);
 	}
 
 	@Override
@@ -149,10 +146,7 @@ class ClientHelperImpl implements ClientHelper {
 	@Override
 	public BdfList getMessageAsList(Transaction txn, MessageId m)
 			throws DbException, FormatException {
-		byte[] raw = db.getRawMessage(txn, m);
-		if (raw == null) return null;
-		return toList(raw, MESSAGE_HEADER_LENGTH,
-				raw.length - MESSAGE_HEADER_LENGTH);
+		return toList(db.getMessage(txn, m).getBody());
 	}
 
 	@Override
@@ -364,9 +358,7 @@ class ClientHelperImpl implements ClientHelper {
 
 	@Override
 	public BdfList toList(Message m) throws FormatException {
-		byte[] raw = m.getRaw();
-		return toList(raw, MESSAGE_HEADER_LENGTH,
-				raw.length - MESSAGE_HEADER_LENGTH);
+		return toList(m.getBody());
 	}
 
 	@Override

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

@@ -2,9 +2,11 @@ package org.briarproject.bramble.db;
 
 import org.briarproject.bramble.api.contact.Contact;
 import org.briarproject.bramble.api.contact.ContactId;
+import org.briarproject.bramble.api.crypto.SecretKey;
 import org.briarproject.bramble.api.db.DataTooNewException;
 import org.briarproject.bramble.api.db.DataTooOldException;
 import org.briarproject.bramble.api.db.DbException;
+import org.briarproject.bramble.api.db.MessageDeletedException;
 import org.briarproject.bramble.api.db.Metadata;
 import org.briarproject.bramble.api.db.MigrationListener;
 import org.briarproject.bramble.api.identity.Author;
@@ -48,7 +50,8 @@ interface Database<T> {
 	 * @throws DataTooOldException if the data uses an older schema than the
 	 * current code and cannot be migrated
 	 */
-	boolean open(@Nullable MigrationListener listener) throws DbException;
+	boolean open(SecretKey key, @Nullable MigrationListener listener)
+			throws DbException;
 
 	/**
 	 * Prevents new transactions from starting, waits for all current
@@ -295,6 +298,15 @@ interface Database<T> {
 	 */
 	Collection<LocalAuthor> getLocalAuthors(T txn) throws DbException;
 
+	/**
+	 * Returns the message with the given ID.
+	 * <p/>
+	 * Read-only.
+	 *
+	 * @throws MessageDeletedException if the message has been deleted
+	 */
+	Message getMessage(T txn, MessageId m) throws DbException;
+
 	/**
 	 * Returns the IDs and states of all dependencies of the given message.
 	 * For missing dependencies and dependencies in other groups, the state
@@ -409,7 +421,7 @@ interface Database<T> {
 	 * Read-only.
 	 */
 	Collection<MessageId> getMessagesToOffer(T txn, ContactId c,
-			int maxMessages) throws DbException;
+			int maxMessages, int maxLatency) throws DbException;
 
 	/**
 	 * Returns the IDs of some messages that are eligible to be requested from
@@ -426,8 +438,8 @@ interface Database<T> {
 	 * <p/>
 	 * Read-only.
 	 */
-	Collection<MessageId> getMessagesToSend(T txn, ContactId c, int maxLength)
-			throws DbException;
+	Collection<MessageId> getMessagesToSend(T txn, ContactId c, int maxLength,
+			int maxLatency) throws DbException;
 
 	/**
 	 * Returns the IDs of any messages that need to be validated.
@@ -462,15 +474,6 @@ interface Database<T> {
 	 */
 	long getNextSendTime(T txn, ContactId c) 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(T txn, MessageId m) throws DbException;
-
 	/**
 	 * Returns the IDs of some messages that are eligible to be sent to the
 	 * given contact and have been requested by the contact, up to the given
@@ -479,7 +482,7 @@ interface Database<T> {
 	 * Read-only.
 	 */
 	Collection<MessageId> getRequestedMessagesToSend(T txn, ContactId c,
-			int maxLength) throws DbException;
+			int maxLength, int maxLatency) throws DbException;
 
 	/**
 	 * Returns all settings in the given namespace.
@@ -641,14 +644,14 @@ interface Database<T> {
 	 * Marks the given transport keys as usable for outgoing streams.
 	 */
 	void setTransportKeysActive(T txn, TransportId t, KeySetId k)
-		throws DbException;
+			throws DbException;
 
 	/**
-	 * Updates the transmission count and expiry time of the given message
-	 * with respect to the given contact, using the latency of the transport
-	 * over which it was sent.
+	 * Updates the transmission count, expiry time and estimated time of arrival
+	 * of the given message with respect to the given contact, using the latency
+	 * of the transport over which it was sent.
 	 */
-	void updateExpiryTime(T txn, ContactId c, MessageId m, int maxLatency)
+	void updateExpiryTimeAndEta(T txn, ContactId c, MessageId m, int maxLatency)
 			throws DbException;
 
 	/**

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

@@ -6,6 +6,7 @@ import org.briarproject.bramble.api.contact.event.ContactAddedEvent;
 import org.briarproject.bramble.api.contact.event.ContactRemovedEvent;
 import org.briarproject.bramble.api.contact.event.ContactStatusChangedEvent;
 import org.briarproject.bramble.api.contact.event.ContactVerifiedEvent;
+import org.briarproject.bramble.api.crypto.SecretKey;
 import org.briarproject.bramble.api.db.ContactExistsException;
 import org.briarproject.bramble.api.db.DatabaseComponent;
 import org.briarproject.bramble.api.db.DbException;
@@ -103,9 +104,9 @@ class DatabaseComponentImpl<T> implements DatabaseComponent {
 	}
 
 	@Override
-	public boolean open(@Nullable MigrationListener listener)
+	public boolean open(SecretKey key, @Nullable MigrationListener listener)
 			throws DbException {
-		boolean reopened = db.open(listener);
+		boolean reopened = db.open(key, listener);
 		shutdown.addShutdownHook(() -> {
 			try {
 				close();
@@ -306,17 +307,18 @@ class DatabaseComponentImpl<T> implements DatabaseComponent {
 
 	@Nullable
 	@Override
-	public Collection<byte[]> generateBatch(Transaction transaction,
+	public Collection<Message> generateBatch(Transaction transaction,
 			ContactId c, int maxLength, int maxLatency) throws DbException {
 		if (transaction.isReadOnly()) throw new IllegalArgumentException();
 		T txn = unbox(transaction);
 		if (!db.containsContact(txn, c))
 			throw new NoSuchContactException();
-		Collection<MessageId> ids = db.getMessagesToSend(txn, c, maxLength);
-		List<byte[]> messages = new ArrayList<>(ids.size());
+		Collection<MessageId> ids =
+				db.getMessagesToSend(txn, c, maxLength, maxLatency);
+		List<Message> messages = new ArrayList<>(ids.size());
 		for (MessageId m : ids) {
-			messages.add(db.getRawMessage(txn, m));
-			db.updateExpiryTime(txn, c, m, maxLatency);
+			messages.add(db.getMessage(txn, m));
+			db.updateExpiryTimeAndEta(txn, c, m, maxLatency);
 		}
 		if (ids.isEmpty()) return null;
 		db.lowerRequestedFlag(txn, c, ids);
@@ -332,9 +334,11 @@ class DatabaseComponentImpl<T> implements DatabaseComponent {
 		T txn = unbox(transaction);
 		if (!db.containsContact(txn, c))
 			throw new NoSuchContactException();
-		Collection<MessageId> ids = db.getMessagesToOffer(txn, c, maxMessages);
+		Collection<MessageId> ids =
+				db.getMessagesToOffer(txn, c, maxMessages, maxLatency);
 		if (ids.isEmpty()) return null;
-		for (MessageId m : ids) db.updateExpiryTime(txn, c, m, maxLatency);
+		for (MessageId m : ids)
+			db.updateExpiryTimeAndEta(txn, c, m, maxLatency);
 		return new Offer(ids);
 	}
 
@@ -355,18 +359,18 @@ class DatabaseComponentImpl<T> implements DatabaseComponent {
 
 	@Nullable
 	@Override
-	public Collection<byte[]> generateRequestedBatch(Transaction transaction,
+	public Collection<Message> generateRequestedBatch(Transaction transaction,
 			ContactId c, int maxLength, int maxLatency) throws DbException {
 		if (transaction.isReadOnly()) throw new IllegalArgumentException();
 		T txn = unbox(transaction);
 		if (!db.containsContact(txn, c))
 			throw new NoSuchContactException();
-		Collection<MessageId> ids = db.getRequestedMessagesToSend(txn, c,
-				maxLength);
-		List<byte[]> messages = new ArrayList<>(ids.size());
+		Collection<MessageId> ids =
+				db.getRequestedMessagesToSend(txn, c, maxLength, maxLatency);
+		List<Message> messages = new ArrayList<>(ids.size());
 		for (MessageId m : ids) {
-			messages.add(db.getRawMessage(txn, m));
-			db.updateExpiryTime(txn, c, m, maxLatency);
+			messages.add(db.getMessage(txn, m));
+			db.updateExpiryTimeAndEta(txn, c, m, maxLatency);
 		}
 		if (ids.isEmpty()) return null;
 		db.lowerRequestedFlag(txn, c, ids);
@@ -456,6 +460,15 @@ class DatabaseComponentImpl<T> implements DatabaseComponent {
 		return db.getLocalAuthors(txn);
 	}
 
+	@Override
+	public Message getMessage(Transaction transaction, MessageId m)
+			throws DbException {
+		T txn = unbox(transaction);
+		if (!db.containsMessage(txn, m))
+			throw new NoSuchMessageException();
+		return db.getMessage(txn, m);
+	}
+
 	@Override
 	public Collection<MessageId> getMessageIds(Transaction transaction,
 			GroupId g) throws DbException {
@@ -486,16 +499,6 @@ class DatabaseComponentImpl<T> implements DatabaseComponent {
 		return db.getMessagesToShare(txn);
 	}
 
-	@Nullable
-	@Override
-	public byte[] getRawMessage(Transaction transaction, MessageId m)
-			throws DbException {
-		T txn = unbox(transaction);
-		if (!db.containsMessage(txn, m))
-			throw new NoSuchMessageException();
-		return db.getRawMessage(txn, m);
-	}
-
 	@Override
 	public Map<MessageId, Metadata> getMessageMetadata(Transaction transaction,
 			GroupId g) throws DbException {
@@ -655,7 +658,7 @@ class DatabaseComponentImpl<T> implements DatabaseComponent {
 		merged.putAll(s);
 		if (!merged.equals(old)) {
 			db.mergeSettings(txn, s, namespace);
-			transaction.attach(new SettingsUpdatedEvent(namespace));
+			transaction.attach(new SettingsUpdatedEvent(namespace, merged));
 		}
 	}
 
@@ -855,7 +858,8 @@ class DatabaseComponentImpl<T> implements DatabaseComponent {
 		if (!db.containsMessage(txn, m))
 			throw new NoSuchMessageException();
 		if (db.getMessageState(txn, m) != DELIVERED)
-			throw new IllegalArgumentException("Shared undelivered message");
+			throw new IllegalArgumentException(
+					"Shared undelivered message");
 		db.setMessageShared(txn, m);
 		transaction.attach(new MessageSharedEvent(m));
 	}
@@ -881,7 +885,8 @@ class DatabaseComponentImpl<T> implements DatabaseComponent {
 			throw new NoSuchMessageException();
 		State dependentState = db.getMessageState(txn, dependent.getId());
 		for (MessageId dependency : dependencies) {
-			db.addMessageDependency(txn, dependent, dependency, dependentState);
+			db.addMessageDependency(txn, dependent, dependency,
+					dependentState);
 		}
 	}
 
@@ -913,7 +918,8 @@ class DatabaseComponentImpl<T> implements DatabaseComponent {
 		T txn = unbox(transaction);
 		for (KeySet ks : keys) {
 			TransportId t = ks.getTransportKeys().getTransportId();
-			if (db.containsTransport(txn, t)) db.updateTransportKeys(txn, ks);
+			if (db.containsTransport(txn, t))
+				db.updateTransportKeys(txn, ks);
 		}
 	}
 }

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

@@ -4,6 +4,7 @@ import org.briarproject.bramble.api.db.DatabaseComponent;
 import org.briarproject.bramble.api.db.DatabaseConfig;
 import org.briarproject.bramble.api.event.EventBus;
 import org.briarproject.bramble.api.lifecycle.ShutdownManager;
+import org.briarproject.bramble.api.sync.MessageFactory;
 import org.briarproject.bramble.api.system.Clock;
 
 import java.sql.Connection;
@@ -18,8 +19,9 @@ public class DatabaseModule {
 
 	@Provides
 	@Singleton
-	Database<Connection> provideDatabase(DatabaseConfig config, Clock clock) {
-		return new H2Database(config, clock);
+	Database<Connection> provideDatabase(DatabaseConfig config,
+			MessageFactory messageFactory, Clock clock) {
+		return new H2Database(config, messageFactory, clock);
 	}
 
 	@Provides

bramble-core/src/main/java/org/briarproject/bramble/db/H2Database.java

@@ -5,6 +5,7 @@ import org.briarproject.bramble.api.db.DatabaseConfig;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.db.MigrationListener;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.api.sync.MessageFactory;
 import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.bramble.util.StringUtils;
 
@@ -32,10 +33,14 @@ class H2Database extends JdbcDatabase {
 	private final DatabaseConfig config;
 	private final String url;
 
+	@Nullable
+	private volatile SecretKey key = null;
+
 	@Inject
-	H2Database(DatabaseConfig config, Clock clock) {
+	H2Database(DatabaseConfig config, MessageFactory messageFactory,
+			Clock clock) {
 		super(HASH_TYPE, SECRET_TYPE, BINARY_TYPE, COUNTER_TYPE, STRING_TYPE,
-				clock);
+				messageFactory, clock);
 		this.config = config;
 		File dir = config.getDatabaseDirectory();
 		String path = new File(dir, "db").getAbsolutePath();
@@ -44,11 +49,11 @@ class H2Database extends JdbcDatabase {
 	}
 
 	@Override
-	public boolean open(@Nullable MigrationListener listener)
+	public boolean open(SecretKey key, @Nullable MigrationListener listener)
 			throws DbException {
-		boolean reopen = config.databaseExists();
-		if (!reopen) config.getDatabaseDirectory().mkdirs();
-		super.open("org.h2.Driver", reopen, listener);
+		this.key = key;
+		boolean reopen = !config.getDatabaseDirectory().mkdirs();
+		super.open("org.h2.Driver", reopen, key, listener);
 		return reopen;
 	}
 
@@ -63,7 +68,7 @@ class H2Database extends JdbcDatabase {
 	}
 
 	@Override
-	public long getFreeSpace() throws DbException {
+	public long getFreeSpace() {
 		File dir = config.getDatabaseDirectory();
 		long maxSize = config.getMaxSize();
 		long free = dir.getFreeSpace();
@@ -88,7 +93,7 @@ class H2Database extends JdbcDatabase {
 
 	@Override
 	protected Connection createConnection() throws SQLException {
-		SecretKey key = config.getEncryptionKey();
+		SecretKey key = this.key;
 		if (key == null) throw new IllegalStateException();
 		Properties props = new Properties();
 		props.setProperty("user", "user");

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

@@ -5,6 +5,7 @@ import org.briarproject.bramble.api.db.DatabaseConfig;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.db.MigrationListener;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.api.sync.MessageFactory;
 import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.bramble.util.StringUtils;
 
@@ -33,10 +34,14 @@ class HyperSqlDatabase extends JdbcDatabase {
 	private final DatabaseConfig config;
 	private final String url;
 
+	@Nullable
+	private volatile SecretKey key = null;
+
 	@Inject
-	HyperSqlDatabase(DatabaseConfig config, Clock clock) {
+	HyperSqlDatabase(DatabaseConfig config, MessageFactory messageFactory,
+			Clock clock) {
 		super(HASH_TYPE, SECRET_TYPE, BINARY_TYPE, COUNTER_TYPE, STRING_TYPE,
-				clock);
+				messageFactory, clock);
 		this.config = config;
 		File dir = config.getDatabaseDirectory();
 		String path = new File(dir, "db").getAbsolutePath();
@@ -46,10 +51,11 @@ class HyperSqlDatabase extends JdbcDatabase {
 	}
 
 	@Override
-	public boolean open(@Nullable MigrationListener listener) throws DbException {
-		boolean reopen = config.databaseExists();
-		if (!reopen) config.getDatabaseDirectory().mkdirs();
-		super.open("org.hsqldb.jdbc.JDBCDriver", reopen, listener);
+	public boolean open(SecretKey key, @Nullable MigrationListener listener)
+			throws DbException {
+		this.key = key;
+		boolean reopen = !config.getDatabaseDirectory().mkdirs();
+		super.open("org.hsqldb.jdbc.JDBCDriver", reopen, key, listener);
 		return reopen;
 	}
 
@@ -93,7 +99,7 @@ class HyperSqlDatabase extends JdbcDatabase {
 
 	@Override
 	protected Connection createConnection() throws SQLException {
-		SecretKey key = config.getEncryptionKey();
+		SecretKey key = this.key;
 		if (key == null) throw new IllegalStateException();
 		String hex = StringUtils.toHexString(key.getBytes());
 		return DriverManager.getConnection(url + ";crypt_key=" + hex);

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

@@ -7,6 +7,7 @@ import org.briarproject.bramble.api.db.DataTooNewException;
 import org.briarproject.bramble.api.db.DataTooOldException;
 import org.briarproject.bramble.api.db.DbClosedException;
 import org.briarproject.bramble.api.db.DbException;
+import org.briarproject.bramble.api.db.MessageDeletedException;
 import org.briarproject.bramble.api.db.Metadata;
 import org.briarproject.bramble.api.db.MigrationListener;
 import org.briarproject.bramble.api.identity.Author;
@@ -20,6 +21,7 @@ import org.briarproject.bramble.api.sync.Group;
 import org.briarproject.bramble.api.sync.Group.Visibility;
 import org.briarproject.bramble.api.sync.GroupId;
 import org.briarproject.bramble.api.sync.Message;
+import org.briarproject.bramble.api.sync.MessageFactory;
 import org.briarproject.bramble.api.sync.MessageId;
 import org.briarproject.bramble.api.sync.MessageStatus;
 import org.briarproject.bramble.api.sync.ValidationManager.State;
@@ -36,6 +38,7 @@ import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.sql.Statement;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.HashMap;
@@ -53,13 +56,13 @@ import java.util.logging.Logger;
 import javax.annotation.Nullable;
 
 import static java.sql.Types.INTEGER;
-import static java.util.Collections.singletonList;
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.api.db.Metadata.REMOVE;
 import static org.briarproject.bramble.api.sync.Group.Visibility.INVISIBLE;
 import static org.briarproject.bramble.api.sync.Group.Visibility.SHARED;
 import static org.briarproject.bramble.api.sync.Group.Visibility.VISIBLE;
+import static org.briarproject.bramble.api.sync.SyncConstants.MESSAGE_HEADER_LENGTH;
 import static org.briarproject.bramble.api.sync.ValidationManager.State.DELIVERED;
 import static org.briarproject.bramble.api.sync.ValidationManager.State.PENDING;
 import static org.briarproject.bramble.api.sync.ValidationManager.State.UNKNOWN;
@@ -76,7 +79,7 @@ import static org.briarproject.bramble.util.LogUtils.logException;
 abstract class JdbcDatabase implements Database<Connection> {
 
 	// Package access for testing
-	static final int CODE_SCHEMA_VERSION = 39;
+	static final int CODE_SCHEMA_VERSION = 40;
 
 	// Rotation period offsets for incoming transport keys
 	private static final int OFFSET_PREV = -1;
@@ -216,6 +219,7 @@ abstract class JdbcDatabase implements Database<Connection> {
 					+ " requested BOOLEAN NOT NULL,"
 					+ " expiry BIGINT NOT NULL,"
 					+ " txCount INT NOT NULL,"
+					+ " eta BIGINT NOT NULL,"
 					+ " PRIMARY KEY (messageId, contactId),"
 					+ " FOREIGN KEY (messageId)"
 					+ " REFERENCES messages (messageId)"
@@ -304,6 +308,7 @@ abstract class JdbcDatabase implements Database<Connection> {
 	// Different database libraries use different names for certain types
 	private final String hashType, secretType, binaryType;
 	private final String counterType, stringType;
+	private final MessageFactory messageFactory;
 	private final Clock clock;
 
 	// Locking: connectionsLock
@@ -319,16 +324,18 @@ abstract class JdbcDatabase implements Database<Connection> {
 	private final Condition connectionsChanged = connectionsLock.newCondition();
 
 	JdbcDatabase(String hashType, String secretType, String binaryType,
-			String counterType, String stringType, Clock clock) {
+			String counterType, String stringType,
+			MessageFactory messageFactory, Clock clock) {
 		this.hashType = hashType;
 		this.secretType = secretType;
 		this.binaryType = binaryType;
 		this.counterType = counterType;
 		this.stringType = stringType;
+		this.messageFactory = messageFactory;
 		this.clock = clock;
 	}
 
-	protected void open(String driverClass, boolean reopen,
+	protected void open(String driverClass, boolean reopen, SecretKey key,
 			@Nullable MigrationListener listener) throws DbException {
 		// Load the JDBC driver
 		try {
@@ -391,7 +398,7 @@ abstract class JdbcDatabase implements Database<Connection> {
 
 	// Package access for testing
 	List<Migration<Connection>> getMigrations() {
-		return singletonList(new Migration38_39());
+		return Arrays.asList(new Migration38_39(), new Migration39_40());
 	}
 
 	private void storeSchemaVersion(Connection txn, int version)
@@ -726,7 +733,7 @@ abstract class JdbcDatabase implements Database<Connection> {
 			ps.setLong(3, m.getTimestamp());
 			ps.setInt(4, state.getValue());
 			ps.setBoolean(5, messageShared);
-			byte[] raw = m.getRaw();
+			byte[] raw = messageFactory.getRawMessage(m);
 			ps.setInt(6, raw.length);
 			ps.setBytes(7, raw);
 			int affected = ps.executeUpdate();
@@ -740,7 +747,7 @@ abstract class JdbcDatabase implements Database<Connection> {
 				boolean offered = removeOfferedMessage(txn, c, m.getId());
 				boolean seen = offered || (sender != null && c.equals(sender));
 				addStatus(txn, m.getId(), c, m.getGroupId(), m.getTimestamp(),
-						m.getLength(), state, e.getValue(), messageShared,
+						raw.length, state, e.getValue(), messageShared,
 						false, seen);
 			}
 			// Update denormalised column in messageDependencies if dependency
@@ -799,8 +806,9 @@ abstract class JdbcDatabase implements Database<Connection> {
 		try {
 			String sql = "INSERT INTO statuses (messageId, contactId, groupId,"
 					+ " timestamp, length, state, groupShared, messageShared,"
-					+ " deleted, ack, seen, requested, expiry, txCount)"
-					+ " VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, FALSE, 0, 0)";
+					+ " deleted, ack, seen, requested, expiry, txCount, eta)"
+					+ " VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, FALSE, 0, 0,"
+					+ " 0)";
 			ps = txn.prepareStatement(sql);
 			ps.setBytes(1, m.getBytes());
 			ps.setInt(2, c.getInt());
@@ -1482,6 +1490,35 @@ abstract class JdbcDatabase implements Database<Connection> {
 		}
 	}
 
+	@Override
+	public Message getMessage(Connection txn, MessageId m) throws DbException {
+		PreparedStatement ps = null;
+		ResultSet rs = null;
+		try {
+			String sql = "SELECT groupId, timestamp, raw FROM messages"
+					+ " WHERE messageId = ?";
+			ps = txn.prepareStatement(sql);
+			ps.setBytes(1, m.getBytes());
+			rs = ps.executeQuery();
+			if (!rs.next()) throw new DbStateException();
+			GroupId g = new GroupId(rs.getBytes(1));
+			long timestamp = rs.getLong(2);
+			byte[] raw = rs.getBytes(3);
+			if (rs.next()) throw new DbStateException();
+			rs.close();
+			ps.close();
+			if (raw == null) throw new MessageDeletedException();
+			if (raw.length < MESSAGE_HEADER_LENGTH) throw new AssertionError();
+			byte[] body = new byte[raw.length - MESSAGE_HEADER_LENGTH];
+			System.arraycopy(raw, MESSAGE_HEADER_LENGTH, body, 0, body.length);
+			return new Message(m, g, timestamp, body);
+		} catch (SQLException e) {
+			tryToClose(rs);
+			tryToClose(ps);
+			throw new DbException(e);
+		}
+	}
+
 	@Override
 	public Collection<MessageId> getMessageIds(Connection txn, GroupId g)
 			throws DbException {
@@ -1834,8 +1871,9 @@ abstract class JdbcDatabase implements Database<Connection> {
 
 	@Override
 	public Collection<MessageId> getMessagesToOffer(Connection txn,
-			ContactId c, int maxMessages) throws DbException {
+			ContactId c, int maxMessages, int maxLatency) throws DbException {
 		long now = clock.currentTimeMillis();
+		long eta = now + maxLatency;
 		PreparedStatement ps = null;
 		ResultSet rs = null;
 		try {
@@ -1844,13 +1882,14 @@ abstract class JdbcDatabase implements Database<Connection> {
 					+ " AND groupShared = TRUE AND messageShared = TRUE"
 					+ " AND deleted = FALSE"
 					+ " AND seen = FALSE AND requested = FALSE"
-					+ " AND expiry < ?"
+					+ " AND (expiry <= ? OR eta > ?)"
 					+ " ORDER BY timestamp LIMIT ?";
 			ps = txn.prepareStatement(sql);
 			ps.setInt(1, c.getInt());
 			ps.setInt(2, DELIVERED.getValue());
 			ps.setLong(3, now);
-			ps.setInt(4, maxMessages);
+			ps.setLong(4, eta);
+			ps.setInt(5, maxMessages);
 			rs = ps.executeQuery();
 			List<MessageId> ids = new ArrayList<>();
 			while (rs.next()) ids.add(new MessageId(rs.getBytes(1)));
@@ -1891,8 +1930,9 @@ abstract class JdbcDatabase implements Database<Connection> {
 
 	@Override
 	public Collection<MessageId> getMessagesToSend(Connection txn, ContactId c,
-			int maxLength) throws DbException {
+			int maxLength, int maxLatency) throws DbException {
 		long now = clock.currentTimeMillis();
+		long eta = now + maxLatency;
 		PreparedStatement ps = null;
 		ResultSet rs = null;
 		try {
@@ -1901,12 +1941,13 @@ abstract class JdbcDatabase implements Database<Connection> {
 					+ " AND groupShared = TRUE AND messageShared = TRUE"
 					+ " AND deleted = FALSE"
 					+ " AND seen = FALSE"
-					+ " AND expiry < ?"
+					+ " AND (expiry <= ? OR eta > ?)"
 					+ " ORDER BY timestamp";
 			ps = txn.prepareStatement(sql);
 			ps.setInt(1, c.getInt());
 			ps.setInt(2, DELIVERED.getValue());
 			ps.setLong(3, now);
+			ps.setLong(4, eta);
 			rs = ps.executeQuery();
 			List<MessageId> ids = new ArrayList<>();
 			int total = 0;
@@ -2018,34 +2059,11 @@ abstract class JdbcDatabase implements Database<Connection> {
 		}
 	}
 
-	@Override
-	@Nullable
-	public byte[] getRawMessage(Connection txn, MessageId m)
-			throws DbException {
-		PreparedStatement ps = null;
-		ResultSet rs = null;
-		try {
-			String sql = "SELECT raw FROM messages WHERE messageId = ?";
-			ps = txn.prepareStatement(sql);
-			ps.setBytes(1, m.getBytes());
-			rs = ps.executeQuery();
-			if (!rs.next()) throw new DbStateException();
-			byte[] raw = rs.getBytes(1);
-			if (rs.next()) throw new DbStateException();
-			rs.close();
-			ps.close();
-			return raw;
-		} catch (SQLException e) {
-			tryToClose(rs);
-			tryToClose(ps);
-			throw new DbException(e);
-		}
-	}
-
 	@Override
 	public Collection<MessageId> getRequestedMessagesToSend(Connection txn,
-			ContactId c, int maxLength) throws DbException {
+			ContactId c, int maxLength, int maxLatency) throws DbException {
 		long now = clock.currentTimeMillis();
+		long eta = now + maxLatency;
 		PreparedStatement ps = null;
 		ResultSet rs = null;
 		try {
@@ -2054,12 +2072,13 @@ abstract class JdbcDatabase implements Database<Connection> {
 					+ " AND groupShared = TRUE AND messageShared = TRUE"
 					+ " AND deleted = FALSE"
 					+ " AND seen = FALSE AND requested = TRUE"
-					+ " AND expiry < ?"
+					+ " AND (expiry <= ? OR eta > ?)"
 					+ " ORDER BY timestamp";
 			ps = txn.prepareStatement(sql);
 			ps.setInt(1, c.getInt());
 			ps.setInt(2, DELIVERED.getValue());
 			ps.setLong(3, now);
+			ps.setLong(4, eta);
 			rs = ps.executeQuery();
 			List<MessageId> ids = new ArrayList<>();
 			int total = 0;
@@ -2870,7 +2889,7 @@ abstract class JdbcDatabase implements Database<Connection> {
 	}
 
 	@Override
-	public void updateExpiryTime(Connection txn, ContactId c, MessageId m,
+	public void updateExpiryTimeAndEta(Connection txn, ContactId c, MessageId m,
 			int maxLatency) throws DbException {
 		PreparedStatement ps = null;
 		ResultSet rs = null;
@@ -2886,13 +2905,16 @@ abstract class JdbcDatabase implements Database<Connection> {
 			if (rs.next()) throw new DbStateException();
 			rs.close();
 			ps.close();
-			sql = "UPDATE statuses SET expiry = ?, txCount = txCount + 1"
+			sql = "UPDATE statuses"
+					+ " SET expiry = ?, txCount = txCount + 1, eta = ?"
 					+ " WHERE messageId = ? AND contactId = ?";
 			ps = txn.prepareStatement(sql);
 			long now = clock.currentTimeMillis();
+			long eta = now + maxLatency;
 			ps.setLong(1, calculateExpiry(now, maxLatency, txCount));
-			ps.setBytes(2, m.getBytes());
-			ps.setInt(3, c.getInt());
+			ps.setLong(2, eta);
+			ps.setBytes(3, m.getBytes());
+			ps.setInt(4, c.getInt());
 			int affected = ps.executeUpdate();
 			if (affected != 1) throw new DbStateException();
 			ps.close();

bramble-core/src/main/java/org/briarproject/bramble/db/Migration39_40.java

@@ -0,0 +1,54 @@
+package org.briarproject.bramble.db;
+
+import org.briarproject.bramble.api.db.DbException;
+
+import java.sql.Connection;
+import java.sql.SQLException;
+import java.sql.Statement;
+import java.util.logging.Logger;
+
+import javax.annotation.Nullable;
+
+import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
+
+class Migration39_40 implements Migration<Connection> {
+
+	private static final Logger LOG =
+			Logger.getLogger(Migration39_40.class.getName());
+
+	@Override
+	public int getStartVersion() {
+		return 39;
+	}
+
+	@Override
+	public int getEndVersion() {
+		return 40;
+	}
+
+	@Override
+	public void migrate(Connection txn) throws DbException {
+		Statement s = null;
+		try {
+			s = txn.createStatement();
+			s.execute("ALTER TABLE statuses"
+					+ " ADD eta BIGINT");
+			s.execute("UPDATE statuses SET eta = 0");
+			s.execute("ALTER TABLE statuses"
+					+ " ALTER COLUMN eta"
+					+ " SET NOT NULL");
+		} catch (SQLException e) {
+			tryToClose(s);
+			throw new DbException(e);
+		}
+	}
+
+	private void tryToClose(@Nullable Statement s) {
+		try {
+			if (s != null) s.close();
+		} catch (SQLException e) {
+			logException(LOG, WARNING, e);
+		}
+	}
+}

bramble-core/src/main/java/org/briarproject/bramble/identity/IdentityManagerImpl.java

@@ -1,10 +1,13 @@
 package org.briarproject.bramble.identity;
 
 import org.briarproject.bramble.api.contact.Contact;
+import org.briarproject.bramble.api.crypto.CryptoComponent;
+import org.briarproject.bramble.api.crypto.KeyPair;
 import org.briarproject.bramble.api.db.DatabaseComponent;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.db.Transaction;
 import org.briarproject.bramble.api.identity.Author.Status;
+import org.briarproject.bramble.api.identity.AuthorFactory;
 import org.briarproject.bramble.api.identity.AuthorId;
 import org.briarproject.bramble.api.identity.IdentityManager;
 import org.briarproject.bramble.api.identity.LocalAuthor;
@@ -21,6 +24,8 @@ import static org.briarproject.bramble.api.identity.Author.Status.OURSELVES;
 import static org.briarproject.bramble.api.identity.Author.Status.UNKNOWN;
 import static org.briarproject.bramble.api.identity.Author.Status.UNVERIFIED;
 import static org.briarproject.bramble.api.identity.Author.Status.VERIFIED;
+import static org.briarproject.bramble.util.LogUtils.logDuration;
+import static org.briarproject.bramble.util.LogUtils.now;
 
 @ThreadSafe
 @NotNullByDefault
@@ -30,25 +35,51 @@ class IdentityManagerImpl implements IdentityManager {
 			Logger.getLogger(IdentityManagerImpl.class.getName());
 
 	private final DatabaseComponent db;
+	private final CryptoComponent crypto;
+	private final AuthorFactory authorFactory;
 
 	// The local author is immutable so we can cache it
 	@Nullable
 	private volatile LocalAuthor cachedAuthor;
 
 	@Inject
-	IdentityManagerImpl(DatabaseComponent db) {
+	IdentityManagerImpl(DatabaseComponent db, CryptoComponent crypto,
+			AuthorFactory authorFactory) {
 		this.db = db;
+		this.crypto = crypto;
+		this.authorFactory = authorFactory;
 	}
 
 	@Override
-	public void registerLocalAuthor(LocalAuthor localAuthor)
-			throws DbException {
+	public LocalAuthor createLocalAuthor(String name) {
+		long start = now();
+		KeyPair keyPair = crypto.generateSignatureKeyPair();
+		byte[] publicKey = keyPair.getPublic().getEncoded();
+		byte[] privateKey = keyPair.getPrivate().getEncoded();
+		LocalAuthor localAuthor = authorFactory.createLocalAuthor(name,
+				publicKey, privateKey);
+		logDuration(LOG, "Creating local author", start);
+		return localAuthor;
+	}
+
+	@Override
+	public void registerLocalAuthor(LocalAuthor a) {
+		cachedAuthor = a;
+		LOG.info("Local author registered");
+	}
+
+	@Override
+	public void storeLocalAuthor() throws DbException {
+		LocalAuthor cached = cachedAuthor;
+		if (cached == null) {
+			LOG.info("No local author to store");
+			return;
+		}
 		Transaction txn = db.startTransaction(false);
 		try {
-			db.addLocalAuthor(txn, localAuthor);
+			db.addLocalAuthor(txn, cached);
 			db.commitTransaction(txn);
-			cachedAuthor = localAuthor;
-			LOG.info("Local author registered");
+			LOG.info("Local author stored");
 		} finally {
 			db.endTransaction(txn);
 		}

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

@@ -102,6 +102,7 @@ class KeyAgreementTaskImpl extends Thread implements KeyAgreementTask,
 		KeyAgreementTransport transport =
 				connector.connect(remotePayload, alice);
 		if (transport == null) {
+			LOG.warning("Key agreement failed. Transport was null.");
 			// Notify caller that the connection failed
 			eventBus.broadcast(new KeyAgreementFailedEvent());
 			return;

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

@@ -1,13 +1,13 @@
 package org.briarproject.bramble.keyagreement;
 
 import org.briarproject.bramble.api.FormatException;
-import org.briarproject.bramble.api.UnsupportedVersionException;
 import org.briarproject.bramble.api.data.BdfList;
 import org.briarproject.bramble.api.data.BdfReader;
 import org.briarproject.bramble.api.data.BdfReaderFactory;
 import org.briarproject.bramble.api.keyagreement.Payload;
 import org.briarproject.bramble.api.keyagreement.PayloadParser;
 import org.briarproject.bramble.api.keyagreement.TransportDescriptor;
+import org.briarproject.bramble.api.keyagreement.UnsupportedVersionException;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.BluetoothConstants;
 import org.briarproject.bramble.api.plugin.LanTcpConstants;
@@ -21,6 +21,7 @@ import java.util.List;
 import javax.annotation.concurrent.Immutable;
 import javax.inject.Inject;
 
+import static org.briarproject.bramble.api.keyagreement.KeyAgreementConstants.BETA_PROTOCOL_VERSION;
 import static org.briarproject.bramble.api.keyagreement.KeyAgreementConstants.COMMIT_LENGTH;
 import static org.briarproject.bramble.api.keyagreement.KeyAgreementConstants.PROTOCOL_VERSION;
 import static org.briarproject.bramble.api.keyagreement.KeyAgreementConstants.TRANSPORT_ID_BLUETOOTH;
@@ -43,8 +44,11 @@ class PayloadParserImpl implements PayloadParser {
 		// First byte: the protocol version
 		int protocolVersion = in.read();
 		if (protocolVersion == -1) throw new FormatException();
-		if (protocolVersion != PROTOCOL_VERSION)
-			throw new UnsupportedVersionException();
+		if (protocolVersion != PROTOCOL_VERSION) {
+			boolean tooOld = protocolVersion < PROTOCOL_VERSION ||
+					protocolVersion == BETA_PROTOCOL_VERSION;
+			throw new UnsupportedVersionException(tooOld);
+		}
 		// The rest of the payload is a BDF list with one or more elements
 		BdfReader r = bdfReaderFactory.createReader(in);
 		BdfList payload = r.readList();

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

@@ -1,7 +1,6 @@
 package org.briarproject.bramble.lifecycle;
 
-import org.briarproject.bramble.api.crypto.CryptoComponent;
-import org.briarproject.bramble.api.crypto.KeyPair;
+import org.briarproject.bramble.api.crypto.SecretKey;
 import org.briarproject.bramble.api.db.DataTooNewException;
 import org.briarproject.bramble.api.db.DataTooOldException;
 import org.briarproject.bramble.api.db.DatabaseComponent;
@@ -9,9 +8,7 @@ import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.db.MigrationListener;
 import org.briarproject.bramble.api.db.Transaction;
 import org.briarproject.bramble.api.event.EventBus;
-import org.briarproject.bramble.api.identity.AuthorFactory;
 import org.briarproject.bramble.api.identity.IdentityManager;
-import org.briarproject.bramble.api.identity.LocalAuthor;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager;
 import org.briarproject.bramble.api.lifecycle.Service;
 import org.briarproject.bramble.api.lifecycle.ServiceException;
@@ -26,7 +23,6 @@ import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Semaphore;
 import java.util.logging.Logger;
 
-import javax.annotation.Nullable;
 import javax.annotation.concurrent.ThreadSafe;
 import javax.inject.Inject;
 
@@ -60,8 +56,6 @@ class LifecycleManagerImpl implements LifecycleManager, MigrationListener {
 	private final List<Service> services;
 	private final List<Client> clients;
 	private final List<ExecutorService> executors;
-	private final CryptoComponent crypto;
-	private final AuthorFactory authorFactory;
 	private final IdentityManager identityManager;
 	private final Semaphore startStopSemaphore = new Semaphore(1);
 	private final CountDownLatch dbLatch = new CountDownLatch(1);
@@ -72,12 +66,9 @@ class LifecycleManagerImpl implements LifecycleManager, MigrationListener {
 
 	@Inject
 	LifecycleManagerImpl(DatabaseComponent db, EventBus eventBus,
-			CryptoComponent crypto, AuthorFactory authorFactory,
 			IdentityManager identityManager) {
 		this.db = db;
 		this.eventBus = eventBus;
-		this.crypto = crypto;
-		this.authorFactory = authorFactory;
 		this.identityManager = identityManager;
 		services = new CopyOnWriteArrayList<>();
 		clients = new CopyOnWriteArrayList<>();
@@ -104,25 +95,8 @@ class LifecycleManagerImpl implements LifecycleManager, MigrationListener {
 		executors.add(e);
 	}
 
-	private LocalAuthor createLocalAuthor(String nickname) {
-		long start = now();
-		KeyPair keyPair = crypto.generateSignatureKeyPair();
-		byte[] publicKey = keyPair.getPublic().getEncoded();
-		byte[] privateKey = keyPair.getPrivate().getEncoded();
-		LocalAuthor localAuthor = authorFactory
-				.createLocalAuthor(nickname, publicKey, privateKey);
-		logDuration(LOG, "Creating local author", start);
-		return localAuthor;
-	}
-
-	private void registerLocalAuthor(LocalAuthor author) throws DbException {
-		long start = now();
-		identityManager.registerLocalAuthor(author);
-		logDuration(LOG, "Registering local author", start);
-	}
-
 	@Override
-	public StartResult startServices(@Nullable String nickname) {
+	public StartResult startServices(SecretKey dbKey) {
 		if (!startStopSemaphore.tryAcquire()) {
 			LOG.info("Already starting or stopping");
 			return ALREADY_RUNNING;
@@ -131,13 +105,10 @@ class LifecycleManagerImpl implements LifecycleManager, MigrationListener {
 			LOG.info("Starting services");
 			long start = now();
 
-			boolean reopened = db.open(this);
+			boolean reopened = db.open(dbKey, this);
 			if (reopened) logDuration(LOG, "Reopening database", start);
 			else logDuration(LOG, "Creating database", start);
-
-			if (nickname != null) {
-				registerLocalAuthor(createLocalAuthor(nickname));
-			}
+			identityManager.storeLocalAuthor();
 
 			state = STARTING_SERVICES;
 			dbLatch.countDown();

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

@@ -1,10 +1,5 @@
 package org.briarproject.bramble.lifecycle;
 
-import org.briarproject.bramble.api.crypto.CryptoComponent;
-import org.briarproject.bramble.api.db.DatabaseComponent;
-import org.briarproject.bramble.api.event.EventBus;
-import org.briarproject.bramble.api.identity.AuthorFactory;
-import org.briarproject.bramble.api.identity.IdentityManager;
 import org.briarproject.bramble.api.lifecycle.IoExecutor;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager;
 import org.briarproject.bramble.api.lifecycle.ShutdownManager;
@@ -54,11 +49,9 @@ public class LifecycleModule {
 
 	@Provides
 	@Singleton
-	LifecycleManager provideLifecycleManager(DatabaseComponent db,
-			EventBus eventBus, CryptoComponent crypto,
-			AuthorFactory authorFactory, IdentityManager identityManager) {
-		return new LifecycleManagerImpl(db, eventBus, crypto, authorFactory,
-				identityManager);
+	LifecycleManager provideLifecycleManager(
+			LifecycleManagerImpl lifecycleManager) {
+		return lifecycleManager;
 	}
 
 	@Provides

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

@@ -21,6 +21,7 @@ import org.briarproject.bramble.api.plugin.event.BluetoothEnabledEvent;
 import org.briarproject.bramble.api.plugin.event.DisableBluetoothEvent;
 import org.briarproject.bramble.api.plugin.event.EnableBluetoothEvent;
 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.util.StringUtils;
 
@@ -146,16 +147,15 @@ abstract class BluetoothPlugin<SS> implements DuplexPlugin, EventListener {
 		}
 		updateProperties();
 		running = true;
-		loadSettings();
+		loadSettings(callback.getSettings());
 		if (shouldAllowContactConnections()) {
 			if (isAdapterEnabled()) bind();
 			else enableAdapter();
 		}
 	}
 
-	private void loadSettings() {
-		contactConnections =
-				callback.getSettings().getBoolean(PREF_BT_ENABLE, false);
+	private void loadSettings(Settings settings) {
+		contactConnections = settings.getBoolean(PREF_BT_ENABLE, false);
 	}
 
 	private boolean shouldAllowContactConnections() {
@@ -387,7 +387,7 @@ abstract class BluetoothPlugin<SS> implements DuplexPlugin, EventListener {
 		} else if (e instanceof SettingsUpdatedEvent) {
 			SettingsUpdatedEvent s = (SettingsUpdatedEvent) e;
 			if (s.getNamespace().equals(ID.getString()))
-				ioExecutor.execute(this::onSettingsUpdated);
+				ioExecutor.execute(() -> onSettingsUpdated(s.getSettings()));
 		} else if (e instanceof KeyAgreementListeningEvent) {
 			ioExecutor.execute(connectionLimiter::keyAgreementStarted);
 		} else if (e instanceof KeyAgreementStoppedListeningEvent) {
@@ -395,9 +395,9 @@ abstract class BluetoothPlugin<SS> implements DuplexPlugin, EventListener {
 		}
 	}
 
-	private void onSettingsUpdated() {
+	private void onSettingsUpdated(Settings settings) {
 		boolean wasAllowed = shouldAllowContactConnections();
-		loadSettings();
+		loadSettings(settings);
 		boolean isAllowed = shouldAllowContactConnections();
 		if (wasAllowed && !isAllowed) {
 			LOG.info("Contact connections disabled");

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

@@ -24,7 +24,7 @@ import java.net.SocketException;
 import java.net.UnknownHostException;
 import java.util.ArrayList;
 import java.util.Collection;
-import java.util.Collections;
+import java.util.Enumeration;
 import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
@@ -35,6 +35,9 @@ import java.util.regex.Pattern;
 
 import javax.annotation.Nullable;
 
+import static java.net.NetworkInterface.getNetworkInterfaces;
+import static java.util.Collections.emptyList;
+import static java.util.Collections.list;
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.util.LogUtils.logException;
@@ -303,16 +306,16 @@ abstract class TcpPlugin implements DuplexPlugin {
 	}
 
 	Collection<InetAddress> getLocalIpAddresses() {
-		List<NetworkInterface> ifaces;
 		try {
-			ifaces = Collections.list(NetworkInterface.getNetworkInterfaces());
+			Enumeration<NetworkInterface> ifaces = getNetworkInterfaces();
+			if (ifaces == null) return emptyList();
+			List<InetAddress> addrs = new ArrayList<>();
+			for (NetworkInterface iface : list(ifaces))
+				addrs.addAll(list(iface.getInetAddresses()));
+			return addrs;
 		} catch (SocketException e) {
 			logException(LOG, WARNING, e);
-			return Collections.emptyList();
+			return emptyList();
 		}
-		List<InetAddress> addrs = new ArrayList<>();
-		for (NetworkInterface iface : ifaces)
-			addrs.addAll(Collections.list(iface.getInetAddresses()));
-		return addrs;
 	}
 }

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

@@ -0,0 +1,17 @@
+package org.briarproject.bramble.plugin.tor;
+
+import javax.inject.Singleton;
+
+import dagger.Module;
+import dagger.Provides;
+
+@Module
+public class CircumventionModule {
+
+	@Provides
+	@Singleton
+	CircumventionProvider provideCircumventionProvider(
+			CircumventionProviderImpl provider) {
+		return provider;
+	}
+}

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

@@ -4,6 +4,8 @@ import org.briarproject.bramble.api.lifecycle.IoExecutor;
 
 import java.util.List;
 
+// TODO: Create a module for this so it doesn't have to be public
+
 public interface CircumventionProvider {
 
 	/**

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

@@ -1,13 +1,9 @@
 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;
@@ -16,24 +12,24 @@ import java.util.Set;
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
-public class CircumventionProviderImpl implements CircumventionProvider {
+import static java.util.Arrays.asList;
+
+class CircumventionProviderImpl implements CircumventionProvider {
 
 	private final static String BRIDGE_FILE_NAME = "bridges";
 
-	private final Context ctx;
+	private static final Set<String> BLOCKED_IN_COUNTRIES =
+			new HashSet<>(asList(BLOCKED));
+	private static final Set<String> BRIDGES_WORK_IN_COUNTRIES =
+			new HashSet<>(asList(BRIDGES));
+
 	@Nullable
 	private volatile List<String> bridges = null;
 
 	@Inject
-	public CircumventionProviderImpl(Context ctx) {
-		this.ctx = ctx;
+	CircumventionProviderImpl() {
 	}
 
-	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);
@@ -47,15 +43,14 @@ public class CircumventionProviderImpl implements CircumventionProvider {
 	@Override
 	@IoExecutor
 	public List<String> getBridges() {
-		if (this.bridges != null) return this.bridges;
+		List<String> bridges = this.bridges;
+		if (bridges != null) return new ArrayList<>(bridges);
 
-		Resources res = ctx.getResources();
-		int resId = res.getIdentifier(BRIDGE_FILE_NAME, "raw",
-				ctx.getPackageName());
-		InputStream is = ctx.getResources().openRawResource(resId);
+		InputStream is = getClass().getClassLoader()
+				.getResourceAsStream(BRIDGE_FILE_NAME);
 		Scanner scanner = new Scanner(is);
 
-		List<String> bridges = new ArrayList<>();
+		bridges = new ArrayList<>();
 		while (scanner.hasNextLine()) {
 			String line = scanner.nextLine();
 			if (!line.startsWith("#")) bridges.add(line);

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

@@ -1,17 +1,5 @@
 package org.briarproject.bramble.plugin.tor;
 
-import android.content.BroadcastReceiver;
-import android.content.Context;
-import android.content.Intent;
-import android.content.IntentFilter;
-import android.content.pm.PackageInfo;
-import android.content.pm.PackageManager;
-import android.content.pm.PackageManager.NameNotFoundException;
-import android.content.res.Resources;
-import android.net.ConnectivityManager;
-import android.net.NetworkInfo;
-import android.os.PowerManager;
-
 import net.freehaven.tor.control.EventHandler;
 import net.freehaven.tor.control.TorControlConnection;
 
@@ -21,6 +9,9 @@ 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;
@@ -35,8 +26,8 @@ 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.api.system.ResourceProvider;
 import org.briarproject.bramble.util.IoUtils;
-import org.briarproject.bramble.util.RenewableWakeLock;
 import org.briarproject.bramble.util.StringUtils;
 
 import java.io.Closeable;
@@ -59,10 +50,7 @@ import java.util.Map;
 import java.util.Map.Entry;
 import java.util.Scanner;
 import java.util.concurrent.Executor;
-import java.util.concurrent.Future;
-import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.atomic.AtomicBoolean;
-import java.util.concurrent.atomic.AtomicReference;
 import java.util.logging.Logger;
 import java.util.regex.Pattern;
 import java.util.zip.ZipInputStream;
@@ -70,27 +58,17 @@ import java.util.zip.ZipInputStream;
 import javax.annotation.Nullable;
 import javax.net.SocketFactory;
 
-import static android.content.Context.CONNECTIVITY_SERVICE;
-import static android.content.Context.MODE_PRIVATE;
-import static android.content.Context.POWER_SERVICE;
-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.os.Build.VERSION.SDK_INT;
-import static android.os.PowerManager.ACTION_DEVICE_IDLE_MODE_CHANGED;
-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_MOBILE;
 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_AUTOMATIC;
 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_NETWORK_WITH_BRIDGES;
 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;
@@ -98,7 +76,10 @@ import static org.briarproject.bramble.util.PrivacyUtils.scrubOnion;
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
-class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
+abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
+
+	private static final Logger LOG =
+			Logger.getLogger(TorPlugin.class.getName());
 
 	private static final String[] EVENTS = {
 			"CIRC", "ORCONN", "HS_DESC", "NOTICE", "WARN", "ERR"
@@ -107,14 +88,9 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 	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 ScheduledExecutorService scheduler;
-	private final Context appContext;
+	private final NetworkManager networkManager;
 	private final LocationUtils locationUtils;
 	private final SocketFactory torSocketFactory;
 	private final Clock clock;
@@ -122,55 +98,55 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 	private final DuplexPluginCallback callback;
 	private final String architecture;
 	private final CircumventionProvider circumventionProvider;
+	private final ResourceProvider resourceProvider;
 	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 AtomicReference<Future<?>> connectivityCheck =
-			new AtomicReference<>();
+	private final ConnectionStatus connectionStatus;
 	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;
-	private volatile BroadcastReceiver networkStateReceiver = null;
+	private volatile Settings settings = null;
 
-	TorPlugin(Executor ioExecutor, ScheduledExecutorService scheduler,
-			Context appContext, LocationUtils locationUtils,
-			SocketFactory torSocketFactory, Clock clock, Backoff backoff,
-			DuplexPluginCallback callback, String architecture,
-			CircumventionProvider circumventionProvider, int maxLatency, int maxIdleTime) {
+	protected volatile boolean running = false;
+
+	protected abstract int getProcessId();
+
+	protected abstract long getLastUpdateTime();
+
+	TorPlugin(Executor ioExecutor, NetworkManager networkManager,
+			LocationUtils locationUtils, SocketFactory torSocketFactory,
+			Clock clock, ResourceProvider resourceProvider,
+			CircumventionProvider circumventionProvider, Backoff backoff,
+			DuplexPluginCallback callback, String architecture, int maxLatency,
+			int maxIdleTime, File torDirectory) {
 		this.ioExecutor = ioExecutor;
-		this.scheduler = scheduler;
-		this.appContext = appContext;
+		this.networkManager = networkManager;
 		this.locationUtils = locationUtils;
 		this.torSocketFactory = torSocketFactory;
 		this.clock = clock;
+		this.resourceProvider = resourceProvider;
+		this.circumventionProvider = circumventionProvider;
 		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);
+		this.torDirectory = torDirectory;
 		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");
+		connectionStatus = new ConnectionStatus();
 		// 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);
+		connectionStatusExecutor =
+				new PoliteExecutor("TorPlugin", ioExecutor, 1);
 	}
 
 	@Override
@@ -191,15 +167,25 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 	@Override
 	public void start() throws PluginException {
 		if (used.getAndSet(true)) throw new IllegalStateException();
+		if (!torDirectory.exists()) {
+			if (!torDirectory.mkdirs()) {
+				LOG.warning("Could not create Tor directory.");
+				throw new PluginException();
+			}
+		}
+		// Load the settings
+		settings = callback.getSettings();
 		// Install or update the assets if necessary
 		if (!assetsAreUpToDate()) installAssets();
 		if (cookieFile.exists() && !cookieFile.delete())
 			LOG.warning("Old auth cookie not deleted");
+		// Migrate old settings before having a chance to stop
+		migrateSettings();
 		// 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());
+		String pid = String.valueOf(getProcessId());
 		Process torProcess;
 		ProcessBuilder pb =
 				new ProcessBuilder(torPath, "-f", configPath, OWNER, pid);
@@ -271,26 +257,14 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		} catch (IOException e) {
 			throw new PluginException(e);
 		}
-		// Register to receive network status events
-		networkStateReceiver = new NetworkStateReceiver();
-		IntentFilter filter = new IntentFilter();
-		filter.addAction(CONNECTIVITY_ACTION);
-		filter.addAction(ACTION_SCREEN_ON);
-		filter.addAction(ACTION_SCREEN_OFF);
-		if (SDK_INT >= 23) filter.addAction(ACTION_DEVICE_IDLE_MODE_CHANGED);
-		appContext.registerReceiver(networkStateReceiver, filter);
+		// 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);
-		}
+		return doneFile.lastModified() > getLastUpdateTime();
 	}
 
 	private void installAssets() throws PluginException {
@@ -323,29 +297,23 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 	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);
+		InputStream in = resourceProvider
+				.getResourceInputStream("tor_" + architecture, ".zip");
 		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);
+		InputStream in = resourceProvider.getResourceInputStream("geoip",
+				".zip");
 		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());
+		return getClass().getClassLoader().getResourceAsStream("torrc");
 	}
 
 	private void tryToClose(@Nullable Closeable c) {
@@ -392,7 +360,7 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 	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);
+			String portString = settings.get(PREF_TOR_PORT);
 			int port;
 			if (StringUtils.isNullOrEmpty(portString)) port = 0;
 			else port = Integer.parseInt(portString);
@@ -437,7 +405,7 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 	private void publishHiddenService(String port) {
 		if (!running) return;
 		LOG.info("Creating hidden service");
-		String privKey = callback.getSettings().get(HS_PRIVKEY);
+		String privKey = settings.get(HS_PRIVKEY);
 		Map<Integer, String> portLines =
 				Collections.singletonMap(80, "127.0.0.1:" + port);
 		Map<String, String> response;
@@ -491,15 +459,11 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		}
 	}
 
-	private void enableNetwork(boolean enable) throws IOException {
+	protected 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();
-		}
+		if (!enable) callback.transportDisabled();
 	}
 
 	private void enableBridges(boolean enable) throws IOException {
@@ -517,8 +481,6 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 	public void stop() {
 		running = false;
 		tryToClose(socket);
-		if (networkStateReceiver != null)
-			appContext.unregisterReceiver(networkStateReceiver);
 		if (controlSocket != null && controlConnection != null) {
 			try {
 				LOG.info("Stopping Tor");
@@ -529,7 +491,6 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 				logException(LOG, WARNING, e);
 			}
 		}
-		wakeLock.release();
 	}
 
 	@Override
@@ -580,7 +541,6 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		try {
 			if (LOG.isLoggable(INFO))
 				LOG.info("Connecting to " + scrubOnion(onion));
-			controlConnection.forgetHiddenService(onion);
 			s = torSocketFactory.createSocket(onion + ".onion", 80);
 			s.setSoTimeout(socketTimeout);
 			if (LOG.isLoggable(INFO))
@@ -628,9 +588,12 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 
 	@Override
 	public void orConnStatus(String status, String orName) {
-		if (LOG.isLoggable(INFO)) LOG.info("OR connection " + status);
-		if (status.equals("CLOSED") || status.equals("FAILED"))
-			updateConnectionStatus(); // Check whether we've lost connectivity
+		if (LOG.isLoggable(INFO))
+			LOG.info("OR connection " + status + " " + orName);
+		if (status.equals("CLOSED") || status.equals("FAILED")) {
+			// Check whether we've lost connectivity
+			updateConnectionStatus(networkManager.getNetworkStatus());
+		}
 	}
 
 	@Override
@@ -663,24 +626,27 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 			SettingsUpdatedEvent s = (SettingsUpdatedEvent) e;
 			if (s.getNamespace().equals(ID.getString())) {
 				LOG.info("Tor settings updated");
-				updateConnectionStatus();
+				settings = s.getSettings();
+				updateConnectionStatus(networkManager.getNetworkStatus());
 			}
+		} else if (e instanceof NetworkStatusEvent) {
+			updateConnectionStatus(((NetworkStatusEvent) e).getStatus());
 		}
 	}
 
-	private void updateConnectionStatus() {
+	private void updateConnectionStatus(NetworkStatus status) {
 		connectionStatusExecutor.execute(() -> {
 			if (!running) return;
-			Object o = appContext.getSystemService(CONNECTIVITY_SERVICE);
-			ConnectivityManager cm = (ConnectivityManager) o;
-			NetworkInfo net = cm.getActiveNetworkInfo();
-			boolean online = net != null && net.isConnected();
-			boolean wifi = online && net.getType() == TYPE_WIFI;
+			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);
+			int network = settings.getInt(PREF_TOR_NETWORK,
+					PREF_TOR_NETWORK_AUTOMATIC);
+			boolean useMobile = settings.getBoolean(PREF_TOR_MOBILE, true);
+			boolean bridgesWork = circumventionProvider.doBridgesWork(country);
+			boolean automatic = network == PREF_TOR_NETWORK_AUTOMATIC;
 
 			if (LOG.isLoggable(INFO)) {
 				LOG.info("Online: " + online + ", wifi: " + wifi);
@@ -692,21 +658,20 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 				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");
+				} else if (network == PREF_TOR_NETWORK_NEVER ||
+						(!useMobile && !wifi)) {
+					LOG.info("Disabling network due to setting");
 					enableNetwork(false);
-				} else if (blocked) {
-					if (circumventionProvider.doBridgesWork(country)) {
-						LOG.info("Enabling network, using bridges");
-						enableBridges(true);
-						enableNetwork(true);
-					} else {
-						LOG.info("Disabling network, country is blocked");
-						enableNetwork(false);
-					}
+				} else if (automatic && blocked && !bridgesWork) {
+					LOG.info("Disabling network, country is blocked");
+					enableNetwork(false);
+				} else if (network == PREF_TOR_NETWORK_WITH_BRIDGES ||
+						(automatic && bridgesWork)) {
+					LOG.info("Enabling network, using bridges");
+					enableBridges(true);
+					enableNetwork(true);
 				} else {
-					LOG.info("Enabling network");
+					LOG.info("Enabling network, not using bridges");
 					enableBridges(false);
 					enableNetwork(true);
 				}
@@ -716,27 +681,19 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		});
 	}
 
-	private void scheduleConnectionStatusUpdate() {
-		Future<?> newConnectivityCheck =
-				scheduler.schedule(this::updateConnectionStatus, 1, MINUTES);
-		Future<?> oldConnectivityCheck =
-				connectivityCheck.getAndSet(newConnectivityCheck);
-		if (oldConnectivityCheck != null) oldConnectivityCheck.cancel(false);
-	}
-
-	private class NetworkStateReceiver extends BroadcastReceiver {
-
-		@Override
-		public void onReceive(Context ctx, Intent i) {
-			if (!running) return;
-			String action = i.getAction();
-			if (LOG.isLoggable(INFO)) LOG.info("Received broadcast " + action);
-			updateConnectionStatus();
-			if (ACTION_SCREEN_ON.equals(action)
-					|| ACTION_SCREEN_OFF.equals(action)) {
-				scheduleConnectionStatusUpdate();
-			}
+	// TODO remove when sufficient time has passed. Added 2018-08-15
+	private void migrateSettings() {
+		Settings sOld = callback.getSettings();
+		int oldNetwork = sOld.getInt("network", -1);
+		if (oldNetwork == -1) return;
+		Settings s = new Settings();
+		if (oldNetwork == 0) {
+			s.putInt(PREF_TOR_NETWORK, PREF_TOR_NETWORK_NEVER);
+		} else if (oldNetwork == 1) {
+			s.putBoolean(PREF_TOR_MOBILE, false);
 		}
+		s.putInt("network", -1);
+		callback.mergeSettings(s);
 	}
 
 	private static class ConnectionStatus {

bramble-core/src/main/java/org/briarproject/bramble/properties/TransportPropertyManagerImpl.java

@@ -164,7 +164,6 @@ class TransportPropertyManagerImpl implements TransportPropertyManager,
 			for (Entry<TransportId, LatestUpdate> e : latest.entrySet()) {
 				BdfList message = clientHelper.getMessageAsList(txn,
 						e.getValue().messageId);
-				if (message == null) throw new DbException();
 				local.put(e.getKey(), parseProperties(message));
 			}
 			return local;
@@ -187,7 +186,6 @@ class TransportPropertyManagerImpl implements TransportPropertyManager,
 					// Retrieve and parse the latest local properties
 					BdfList message = clientHelper.getMessageAsList(txn,
 							latest.messageId);
-					if (message == null) throw new DbException();
 					p = parseProperties(message);
 				}
 				db.commitTransaction(txn);
@@ -227,7 +225,6 @@ class TransportPropertyManagerImpl implements TransportPropertyManager,
 			// Retrieve and parse the latest remote properties
 			BdfList message =
 					clientHelper.getMessageAsList(txn, latest.messageId);
-			if (message == null) throw new DbException();
 			return parseProperties(message);
 		} catch (FormatException e) {
 			throw new DbException(e);
@@ -265,7 +262,6 @@ class TransportPropertyManagerImpl implements TransportPropertyManager,
 				} else {
 					BdfList message = clientHelper.getMessageAsList(txn,
 							latest.messageId);
-					if (message == null) throw new DbException();
 					TransportProperties old = parseProperties(message);
 					merged = new TransportProperties(old);
 					merged.putAll(p);

bramble-core/src/main/java/org/briarproject/bramble/settings/SettingsManagerImpl.java

@@ -34,6 +34,12 @@ class SettingsManagerImpl implements SettingsManager {
 		return s;
 	}
 
+	@Override
+	public Settings getSettings(Transaction txn, String namespace)
+			throws DbException {
+		return db.getSettings(txn, namespace);
+	}
+
 	@Override
 	public void mergeSettings(Settings s, String namespace) throws DbException {
 		Transaction txn = db.startTransaction(false);

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

@@ -13,6 +13,7 @@ import org.briarproject.bramble.api.lifecycle.IoExecutor;
 import org.briarproject.bramble.api.lifecycle.event.LifecycleEvent;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.sync.Ack;
+import org.briarproject.bramble.api.sync.Message;
 import org.briarproject.bramble.api.sync.Offer;
 import org.briarproject.bramble.api.sync.Request;
 import org.briarproject.bramble.api.sync.SyncRecordWriter;
@@ -274,7 +275,7 @@ class DuplexOutgoingSession implements SyncSession, EventListener {
 			if (!generateBatchQueued.getAndSet(false))
 				throw new AssertionError();
 			try {
-				Collection<byte[]> b;
+				Collection<Message> b;
 				Transaction txn = db.startTransaction(false);
 				try {
 					b = db.generateRequestedBatch(txn, contactId,
@@ -296,9 +297,9 @@ class DuplexOutgoingSession implements SyncSession, EventListener {
 
 	private class WriteBatch implements ThrowingRunnable<IOException> {
 
-		private final Collection<byte[]> batch;
+		private final Collection<Message> batch;
 
-		private WriteBatch(Collection<byte[]> batch) {
+		private WriteBatch(Collection<Message> batch) {
 			this.batch = batch;
 		}
 
@@ -306,7 +307,7 @@ class DuplexOutgoingSession implements SyncSession, EventListener {
 		@Override
 		public void run() throws IOException {
 			if (interrupted) return;
-			for (byte[] raw : batch) recordWriter.writeMessage(raw);
+			for (Message m : batch) recordWriter.writeMessage(m);
 			LOG.info("Sent batch");
 			generateBatch();
 		}

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

@@ -39,11 +39,7 @@ class MessageFactoryImpl implements MessageFactory {
 		if (body.length > MAX_MESSAGE_BODY_LENGTH)
 			throw new IllegalArgumentException();
 		MessageId id = getMessageId(g, timestamp, body);
-		byte[] raw = new byte[MESSAGE_HEADER_LENGTH + body.length];
-		System.arraycopy(g.getBytes(), 0, raw, 0, UniqueId.LENGTH);
-		ByteUtils.writeUint64(timestamp, raw, UniqueId.LENGTH);
-		System.arraycopy(body, 0, raw, MESSAGE_HEADER_LENGTH, body.length);
-		return new Message(id, g, timestamp, raw);
+		return new Message(id, g, timestamp, body);
 	}
 
 	private MessageId getMessageId(GroupId g, long timestamp, byte[] body) {
@@ -69,18 +65,16 @@ class MessageFactoryImpl implements MessageFactory {
 		byte[] body = new byte[raw.length - MESSAGE_HEADER_LENGTH];
 		System.arraycopy(raw, MESSAGE_HEADER_LENGTH, body, 0, body.length);
 		MessageId id = getMessageId(g, timestamp, body);
-		return new Message(id, g, timestamp, raw);
+		return new Message(id, g, timestamp, body);
 	}
 
 	@Override
-	public Message createMessage(MessageId m, byte[] raw) {
-		if (raw.length < MESSAGE_HEADER_LENGTH)
-			throw new IllegalArgumentException();
-		if (raw.length > MAX_MESSAGE_LENGTH)
-			throw new IllegalArgumentException();
-		byte[] groupId = new byte[UniqueId.LENGTH];
-		System.arraycopy(raw, 0, groupId, 0, UniqueId.LENGTH);
-		long timestamp = ByteUtils.readUint64(raw, UniqueId.LENGTH);
-		return new Message(m, new GroupId(groupId), timestamp, raw);
+	public byte[] getRawMessage(Message m) {
+		byte[] body = m.getBody();
+		byte[] raw = new byte[MESSAGE_HEADER_LENGTH + body.length];
+		System.arraycopy(m.getGroupId().getBytes(), 0, raw, 0, UniqueId.LENGTH);
+		ByteUtils.writeUint64(m.getTimestamp(), raw, UniqueId.LENGTH);
+		System.arraycopy(body, 0, raw, MESSAGE_HEADER_LENGTH, body.length);
+		return raw;
 	}
 }

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

@@ -13,6 +13,7 @@ import org.briarproject.bramble.api.lifecycle.IoExecutor;
 import org.briarproject.bramble.api.lifecycle.event.LifecycleEvent;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.sync.Ack;
+import org.briarproject.bramble.api.sync.Message;
 import org.briarproject.bramble.api.sync.SyncRecordWriter;
 import org.briarproject.bramble.api.sync.SyncSession;
 import org.briarproject.bramble.api.transport.StreamWriter;
@@ -171,7 +172,7 @@ class SimplexOutgoingSession implements SyncSession, EventListener {
 		public void run() {
 			if (interrupted) return;
 			try {
-				Collection<byte[]> b;
+				Collection<Message> b;
 				Transaction txn = db.startTransaction(false);
 				try {
 					b = db.generateBatch(txn, contactId,
@@ -193,9 +194,9 @@ class SimplexOutgoingSession implements SyncSession, EventListener {
 
 	private class WriteBatch implements ThrowingRunnable<IOException> {
 
-		private final Collection<byte[]> batch;
+		private final Collection<Message> batch;
 
-		private WriteBatch(Collection<byte[]> batch) {
+		private WriteBatch(Collection<Message> batch) {
 			this.batch = batch;
 		}
 
@@ -203,7 +204,7 @@ class SimplexOutgoingSession implements SyncSession, EventListener {
 		@Override
 		public void run() throws IOException {
 			if (interrupted) return;
-			for (byte[] raw : batch) recordWriter.writeMessage(raw);
+			for (Message m : batch) recordWriter.writeMessage(m);
 			LOG.info("Sent batch");
 			dbExecutor.execute(new GenerateBatch());
 		}

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

@@ -46,7 +46,7 @@ class SyncRecordReaderImpl implements SyncRecordReader {
 	}
 
 	private void readRecord() throws IOException {
-		assert nextRecord == null;
+		if (nextRecord != null) throw new AssertionError();
 		while (true) {
 			nextRecord = reader.readRecord();
 			// Check the protocol version
@@ -62,7 +62,7 @@ class SyncRecordReaderImpl implements SyncRecordReader {
 	}
 
 	private byte getNextRecordType() {
-		assert nextRecord != null;
+		if (nextRecord == null) throw new AssertionError();
 		return nextRecord.getRecordType();
 	}
 
@@ -100,7 +100,7 @@ class SyncRecordReaderImpl implements SyncRecordReader {
 	}
 
 	private List<MessageId> readMessageIds() throws IOException {
-		assert nextRecord != null;
+		if (nextRecord == null) throw new AssertionError();
 		byte[] payload = nextRecord.getPayload();
 		if (payload.length == 0) throw new FormatException();
 		if (payload.length % UniqueId.LENGTH != 0) throw new FormatException();
@@ -122,7 +122,7 @@ class SyncRecordReaderImpl implements SyncRecordReader {
 	@Override
 	public Message readMessage() throws IOException {
 		if (!hasMessage()) throw new FormatException();
-		assert nextRecord != null;
+		if (nextRecord == null) throw new AssertionError();
 		byte[] payload = nextRecord.getPayload();
 		if (payload.length < MESSAGE_HEADER_LENGTH) throw new FormatException();
 		// Validate timestamp

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

@@ -3,6 +3,7 @@ package org.briarproject.bramble.sync;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.record.RecordWriter;
 import org.briarproject.bramble.api.record.RecordWriterFactory;
+import org.briarproject.bramble.api.sync.MessageFactory;
 import org.briarproject.bramble.api.sync.SyncRecordWriter;
 import org.briarproject.bramble.api.sync.SyncRecordWriterFactory;
 
@@ -13,16 +14,19 @@ import javax.inject.Inject;
 @NotNullByDefault
 class SyncRecordWriterFactoryImpl implements SyncRecordWriterFactory {
 
+	private final MessageFactory messageFactory;
 	private final RecordWriterFactory recordWriterFactory;
 
 	@Inject
-	SyncRecordWriterFactoryImpl(RecordWriterFactory recordWriterFactory) {
+	SyncRecordWriterFactoryImpl(MessageFactory messageFactory,
+			RecordWriterFactory recordWriterFactory) {
+		this.messageFactory = messageFactory;
 		this.recordWriterFactory = recordWriterFactory;
 	}
 
 	@Override
 	public SyncRecordWriter createRecordWriter(OutputStream out) {
 		RecordWriter writer = recordWriterFactory.createRecordWriter(out);
-		return new SyncRecordWriterImpl(writer);
+		return new SyncRecordWriterImpl(messageFactory, writer);
 	}
 }

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

@@ -4,6 +4,8 @@ import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.record.Record;
 import org.briarproject.bramble.api.record.RecordWriter;
 import org.briarproject.bramble.api.sync.Ack;
+import org.briarproject.bramble.api.sync.Message;
+import org.briarproject.bramble.api.sync.MessageFactory;
 import org.briarproject.bramble.api.sync.MessageId;
 import org.briarproject.bramble.api.sync.Offer;
 import org.briarproject.bramble.api.sync.Request;
@@ -24,10 +26,12 @@ import static org.briarproject.bramble.api.sync.SyncConstants.PROTOCOL_VERSION;
 @NotNullByDefault
 class SyncRecordWriterImpl implements SyncRecordWriter {
 
+	private final MessageFactory messageFactory;
 	private final RecordWriter writer;
 	private final ByteArrayOutputStream payload = new ByteArrayOutputStream();
 
-	SyncRecordWriterImpl(RecordWriter writer) {
+	SyncRecordWriterImpl(MessageFactory messageFactory, RecordWriter writer) {
+		this.messageFactory = messageFactory;
 		this.writer = writer;
 	}
 
@@ -44,7 +48,8 @@ class SyncRecordWriterImpl implements SyncRecordWriter {
 	}
 
 	@Override
-	public void writeMessage(byte[] raw) throws IOException {
+	public void writeMessage(Message m) throws IOException {
+		byte[] raw = messageFactory.getRawMessage(m);
 		writer.writeRecord(new Record(PROTOCOL_VERSION, MESSAGE, raw));
 	}
 

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

@@ -16,7 +16,6 @@ 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.MessageFactory;
 import org.briarproject.bramble.api.sync.MessageId;
 import org.briarproject.bramble.api.sync.ValidationManager;
 import org.briarproject.bramble.api.sync.event.MessageAddedEvent;
@@ -52,7 +51,6 @@ class ValidationManagerImpl implements ValidationManager, Service,
 
 	private final DatabaseComponent db;
 	private final Executor dbExecutor, validationExecutor;
-	private final MessageFactory messageFactory;
 	private final Map<ClientMajorVersion, MessageValidator> validators;
 	private final Map<ClientMajorVersion, IncomingMessageHook> hooks;
 	private final AtomicBoolean used = new AtomicBoolean(false);
@@ -60,12 +58,10 @@ class ValidationManagerImpl implements ValidationManager, Service,
 	@Inject
 	ValidationManagerImpl(DatabaseComponent db,
 			@DatabaseExecutor Executor dbExecutor,
-			@ValidationExecutor Executor validationExecutor,
-			MessageFactory messageFactory) {
+			@ValidationExecutor Executor validationExecutor) {
 		this.db = db;
 		this.dbExecutor = dbExecutor;
 		this.validationExecutor = validationExecutor;
-		this.messageFactory = messageFactory;
 		validators = new ConcurrentHashMap<>();
 		hooks = new ConcurrentHashMap<>();
 	}
@@ -128,9 +124,7 @@ class ValidationManagerImpl implements ValidationManager, Service,
 			Transaction txn = db.startTransaction(true);
 			try {
 				MessageId id = unvalidated.poll();
-				byte[] raw = db.getRawMessage(txn, id);
-				if (raw == null) throw new DbException();
-				m = messageFactory.createMessage(id, raw);
+				m = db.getMessage(txn, id);
 				g = db.getGroup(txn, m.getGroupId());
 				db.commitTransaction(txn);
 			} finally {
@@ -197,9 +191,7 @@ class ValidationManagerImpl implements ValidationManager, Service,
 						invalidateMessage(txn, id);
 						invalidate = getDependentsToInvalidate(txn, id);
 					} else if (allDelivered) {
-						byte[] raw = db.getRawMessage(txn, id);
-						if (raw == null) throw new DbException();
-						Message m = messageFactory.createMessage(id, raw);
+						Message m = db.getMessage(txn, id);
 						Group g = db.getGroup(txn, m.getGroupId());
 						ClientId c = g.getClientId();
 						int majorVersion = g.getMajorVersion();

bramble-core/src/main/java/org/briarproject/bramble/system/AbstractSecureRandomProvider.java

@@ -7,13 +7,15 @@ import java.io.DataOutputStream;
 import java.io.IOException;
 import java.net.InetAddress;
 import java.net.NetworkInterface;
-import java.util.Collections;
-import java.util.List;
+import java.util.Enumeration;
 import java.util.Map.Entry;
 import java.util.Properties;
 
 import javax.annotation.concurrent.Immutable;
 
+import static java.net.NetworkInterface.getNetworkInterfaces;
+import static java.util.Collections.list;
+
 @Immutable
 @NotNullByDefault
 abstract class AbstractSecureRandomProvider implements SecureRandomProvider {
@@ -23,13 +25,14 @@ abstract class AbstractSecureRandomProvider implements SecureRandomProvider {
 		out.writeLong(System.currentTimeMillis());
 		out.writeLong(System.nanoTime());
 		out.writeLong(Runtime.getRuntime().freeMemory());
-		List<NetworkInterface> ifaces =
-				Collections.list(NetworkInterface.getNetworkInterfaces());
-		for (NetworkInterface i : ifaces) {
-			List<InetAddress> addrs = Collections.list(i.getInetAddresses());
-			for (InetAddress a : addrs) out.write(a.getAddress());
-			byte[] hardware = i.getHardwareAddress();
-			if (hardware != null) out.write(hardware);
+		Enumeration<NetworkInterface> ifaces = getNetworkInterfaces();
+		if (ifaces != null) {
+			for (NetworkInterface i : list(ifaces)) {
+				for (InetAddress a : list(i.getInetAddresses()))
+					out.write(a.getAddress());
+				byte[] hardware = i.getHardwareAddress();
+				if (hardware != null) out.write(hardware);
+			}
 		}
 		for (Entry<String, String> e : System.getenv().entrySet()) {
 			out.writeUTF(e.getKey());

bramble-core/src/main/java/org/briarproject/bramble/versioning/ClientVersioningManagerImpl.java

@@ -139,7 +139,7 @@ class ClientVersioningManagerImpl implements ClientVersioningManager, Client,
 	}
 
 	@Override
-	public void stopService() throws ServiceException {
+	public void stopService() {
 	}
 
 	@Override
@@ -274,9 +274,7 @@ class ClientVersioningManagerImpl implements ClientVersioningManager, Client,
 	private List<ClientVersion> loadClientVersions(Transaction txn,
 			MessageId m) throws DbException {
 		try {
-			BdfList body = clientHelper.getMessageAsList(txn, m);
-			if (body == null) throw new DbException();
-			return parseClientVersions(body);
+			return parseClientVersions(clientHelper.getMessageAsList(txn, m));
 		} catch (FormatException e) {
 			throw new DbException(e);
 		}
@@ -359,9 +357,7 @@ class ClientVersioningManagerImpl implements ClientVersioningManager, Client,
 
 	private Update loadUpdate(Transaction txn, MessageId m) throws DbException {
 		try {
-			BdfList body = clientHelper.getMessageAsList(txn, m);
-			if (body == null) throw new DbException();
-			return parseUpdate(body);
+			return parseUpdate(clientHelper.getMessageAsList(txn, m));
 		} catch (FormatException e) {
 			throw new DbException(e);
 		}

bramble-core/src/main/resources/bridges

@@ -2,4 +2,7 @@ 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 128.105.214.161:8081 1E326AAFB3FCB515015250D8FCCC8E37F91A153B
+Bridge 45.55.1.74:8443 6F18FEFBB0CAECD5ABA755312FCCB34FC11A7AB8
+Bridge 85.229.131.78:444 50E433CCC5FEC11CC34CB4D92033561E065EA106
+Bridge 178.62.62.193:8443 391B1F9B6A28A1C5FAE1872283985F975E5DB029
+Bridge 45.76.29.92:8443 ECF1DD51A46FDEF2C50CED992EEEAE8DED18DA0C

bramble-core/src/test/java/org/briarproject/bramble/account/AccountManagerImplTest.java

@@ -0,0 +1,341 @@
+package org.briarproject.bramble.account;
+
+import org.briarproject.bramble.api.crypto.CryptoComponent;
+import org.briarproject.bramble.api.crypto.SecretKey;
+import org.briarproject.bramble.api.db.DatabaseConfig;
+import org.briarproject.bramble.api.identity.IdentityManager;
+import org.briarproject.bramble.api.identity.LocalAuthor;
+import org.briarproject.bramble.test.BrambleMockTestCase;
+import org.jmock.Expectations;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStreamReader;
+
+import javax.annotation.Nullable;
+
+import static junit.framework.Assert.assertFalse;
+import static junit.framework.Assert.assertNull;
+import static junit.framework.Assert.assertTrue;
+import static org.briarproject.bramble.test.TestUtils.deleteTestDirectory;
+import static org.briarproject.bramble.test.TestUtils.getLocalAuthor;
+import static org.briarproject.bramble.test.TestUtils.getRandomBytes;
+import static org.briarproject.bramble.test.TestUtils.getSecretKey;
+import static org.briarproject.bramble.test.TestUtils.getTestDirectory;
+import static org.briarproject.bramble.util.StringUtils.getRandomString;
+import static org.briarproject.bramble.util.StringUtils.toHexString;
+import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+
+public class AccountManagerImplTest extends BrambleMockTestCase {
+
+	private final DatabaseConfig databaseConfig =
+			context.mock(DatabaseConfig.class);
+	private final CryptoComponent crypto = context.mock(CryptoComponent.class);
+	private final IdentityManager identityManager =
+			context.mock(IdentityManager.class);
+
+	private final SecretKey key = getSecretKey();
+	private final byte[] encryptedKey = getRandomBytes(123);
+	private final String encryptedKeyHex = toHexString(encryptedKey);
+	private final byte[] newEncryptedKey = getRandomBytes(123);
+	private final String newEncryptedKeyHex = toHexString(newEncryptedKey);
+	private final LocalAuthor localAuthor = getLocalAuthor();
+	private final String authorName = localAuthor.getName();
+	private final String password = getRandomString(10);
+	private final String newPassword = getRandomString(10);
+	private final File testDir = getTestDirectory();
+	private final File dbDir = new File(testDir, "db");
+	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 AccountManagerImpl accountManager;
+
+	@Before
+	public void setUp() {
+		context.checking(new Expectations() {{
+			allowing(databaseConfig).getDatabaseDirectory();
+			will(returnValue(dbDir));
+			allowing(databaseConfig).getDatabaseKeyDirectory();
+			will(returnValue(keyDir));
+		}});
+
+		accountManager =
+				new AccountManagerImpl(databaseConfig, crypto, identityManager);
+
+		assertFalse(keyFile.exists());
+		assertFalse(keyBackupFile.exists());
+	}
+
+	@Test
+	public void testSignInReturnsFalseIfDbKeyCannotBeLoaded() {
+		assertFalse(accountManager.signIn(password));
+		assertFalse(accountManager.hasDatabaseKey());
+
+		assertFalse(keyFile.exists());
+		assertFalse(keyBackupFile.exists());
+	}
+
+	@Test
+	public void testSignInReturnsFalseIfPasswordIsWrong() throws Exception {
+		context.checking(new Expectations() {{
+			oneOf(crypto).decryptWithPassword(encryptedKey, password);
+			will(returnValue(null));
+		}});
+
+		storeDatabaseKey(keyFile, encryptedKeyHex);
+		storeDatabaseKey(keyBackupFile, encryptedKeyHex);
+
+		assertEquals(encryptedKeyHex, loadDatabaseKey(keyFile));
+		assertEquals(encryptedKeyHex, loadDatabaseKey(keyBackupFile));
+
+		assertFalse(accountManager.signIn(password));
+		assertFalse(accountManager.hasDatabaseKey());
+
+		assertEquals(encryptedKeyHex, loadDatabaseKey(keyFile));
+		assertEquals(encryptedKeyHex, loadDatabaseKey(keyBackupFile));
+	}
+
+	@Test
+	public void testSignInReturnsTrueIfPasswordIsRight() throws Exception {
+		context.checking(new Expectations() {{
+			oneOf(crypto).decryptWithPassword(encryptedKey, password);
+			will(returnValue(key.getBytes()));
+		}});
+
+		storeDatabaseKey(keyFile, encryptedKeyHex);
+		storeDatabaseKey(keyBackupFile, encryptedKeyHex);
+
+		assertEquals(encryptedKeyHex, loadDatabaseKey(keyFile));
+		assertEquals(encryptedKeyHex, loadDatabaseKey(keyBackupFile));
+
+		assertTrue(accountManager.signIn(password));
+		assertTrue(accountManager.hasDatabaseKey());
+		SecretKey decrypted = accountManager.getDatabaseKey();
+		assertNotNull(decrypted);
+		assertArrayEquals(key.getBytes(), decrypted.getBytes());
+
+		assertEquals(encryptedKeyHex, loadDatabaseKey(keyFile));
+		assertEquals(encryptedKeyHex, loadDatabaseKey(keyBackupFile));
+	}
+
+	@Test
+	public void testDbKeyIsLoadedFromPrimaryFile() throws Exception {
+		storeDatabaseKey(keyFile, encryptedKeyHex);
+
+		assertEquals(encryptedKeyHex, loadDatabaseKey(keyFile));
+		assertFalse(keyBackupFile.exists());
+
+		assertEquals(encryptedKeyHex,
+				accountManager.loadEncryptedDatabaseKey());
+
+		assertEquals(encryptedKeyHex, loadDatabaseKey(keyFile));
+		assertFalse(keyBackupFile.exists());
+	}
+
+	@Test
+	public void testDbKeyIsLoadedFromBackupFile() throws Exception {
+		storeDatabaseKey(keyBackupFile, encryptedKeyHex);
+
+		assertFalse(keyFile.exists());
+		assertEquals(encryptedKeyHex, loadDatabaseKey(keyBackupFile));
+
+		assertEquals(encryptedKeyHex,
+				accountManager.loadEncryptedDatabaseKey());
+
+		assertFalse(keyFile.exists());
+		assertEquals(encryptedKeyHex, loadDatabaseKey(keyBackupFile));
+	}
+
+	@Test
+	public void testDbKeyIsNullIfNotFound() {
+		assertNull(accountManager.loadEncryptedDatabaseKey());
+
+		assertFalse(keyFile.exists());
+		assertFalse(keyBackupFile.exists());
+	}
+
+	@Test
+	public void testStoringDbKeyOverwritesPrimary() throws Exception {
+		storeDatabaseKey(keyFile, encryptedKeyHex);
+
+		assertEquals(encryptedKeyHex, loadDatabaseKey(keyFile));
+		assertFalse(keyBackupFile.exists());
+
+		assertTrue(accountManager.storeEncryptedDatabaseKey(
+				newEncryptedKeyHex));
+
+		assertEquals(newEncryptedKeyHex, loadDatabaseKey(keyFile));
+		assertEquals(newEncryptedKeyHex, loadDatabaseKey(keyBackupFile));
+	}
+
+	@Test
+	public void testStoringDbKeyOverwritesBackup() throws Exception {
+		storeDatabaseKey(keyBackupFile, encryptedKeyHex);
+
+		assertFalse(keyFile.exists());
+		assertEquals(encryptedKeyHex, loadDatabaseKey(keyBackupFile));
+
+		assertTrue(accountManager.storeEncryptedDatabaseKey(
+				newEncryptedKeyHex));
+
+		assertEquals(newEncryptedKeyHex, loadDatabaseKey(keyFile));
+		assertEquals(newEncryptedKeyHex, loadDatabaseKey(keyBackupFile));
+	}
+
+	@Test
+	public void testAccountExistsReturnsFalseIfDbKeyCannotBeLoaded() {
+		assertFalse(accountManager.accountExists());
+
+		assertFalse(keyFile.exists());
+		assertFalse(keyBackupFile.exists());
+	}
+
+	@Test
+	public void testAccountExistsReturnsFalseIfDbDirectoryDoesNotExist()
+			throws Exception {
+		storeDatabaseKey(keyFile, encryptedKeyHex);
+		storeDatabaseKey(keyBackupFile, encryptedKeyHex);
+
+		assertFalse(dbDir.exists());
+
+		assertFalse(accountManager.accountExists());
+
+		assertEquals(encryptedKeyHex, loadDatabaseKey(keyFile));
+		assertEquals(encryptedKeyHex, loadDatabaseKey(keyBackupFile));
+		assertFalse(dbDir.exists());
+	}
+
+	@Test
+	public void testAccountExistsReturnsFalseIfDbDirectoryIsNotDirectory()
+			throws Exception {
+		storeDatabaseKey(keyFile, encryptedKeyHex);
+		storeDatabaseKey(keyBackupFile, encryptedKeyHex);
+
+		assertTrue(dbDir.createNewFile());
+		assertFalse(dbDir.isDirectory());
+
+		assertFalse(accountManager.accountExists());
+
+		assertEquals(encryptedKeyHex, loadDatabaseKey(keyFile));
+		assertEquals(encryptedKeyHex, loadDatabaseKey(keyBackupFile));
+		assertTrue(dbDir.exists());
+		assertFalse(dbDir.isDirectory());
+	}
+
+	@Test
+	public void testAccountExistsReturnsTrueIfDbDirectoryIsDirectory()
+			throws Exception {
+		storeDatabaseKey(keyFile, encryptedKeyHex);
+		storeDatabaseKey(keyBackupFile, encryptedKeyHex);
+
+		assertTrue(dbDir.mkdirs());
+		assertTrue(dbDir.isDirectory());
+
+		assertTrue(accountManager.accountExists());
+
+		assertEquals(encryptedKeyHex, loadDatabaseKey(keyFile));
+		assertEquals(encryptedKeyHex, loadDatabaseKey(keyBackupFile));
+		assertTrue(dbDir.exists());
+		assertTrue(dbDir.isDirectory());
+	}
+
+	@Test
+	public void testCreateAccountStoresDbKey() throws Exception {
+		context.checking(new Expectations() {{
+			oneOf(identityManager).createLocalAuthor(authorName);
+			will(returnValue(localAuthor));
+			oneOf(identityManager).registerLocalAuthor(localAuthor);
+			oneOf(crypto).generateSecretKey();
+			will(returnValue(key));
+			oneOf(crypto).encryptWithPassword(key.getBytes(), password);
+			will(returnValue(encryptedKey));
+		}});
+
+		assertFalse(accountManager.hasDatabaseKey());
+
+		assertTrue(accountManager.createAccount(authorName, password));
+
+		assertTrue(accountManager.hasDatabaseKey());
+		SecretKey dbKey = accountManager.getDatabaseKey();
+		assertNotNull(dbKey);
+		assertArrayEquals(key.getBytes(), dbKey.getBytes());
+
+		assertEquals(encryptedKeyHex, loadDatabaseKey(keyFile));
+		assertEquals(encryptedKeyHex, loadDatabaseKey(keyBackupFile));
+	}
+
+	@Test
+	public void testChangePasswordReturnsFalseIfDbKeyCannotBeLoaded() {
+		assertFalse(accountManager.changePassword(password, newPassword));
+
+		assertFalse(keyFile.exists());
+		assertFalse(keyBackupFile.exists());
+	}
+
+	@Test
+	public void testChangePasswordReturnsFalseIfPasswordIsWrong()
+			throws Exception {
+		context.checking(new Expectations() {{
+			oneOf(crypto).decryptWithPassword(encryptedKey, password);
+			will(returnValue(null));
+		}});
+
+		storeDatabaseKey(keyFile, encryptedKeyHex);
+		storeDatabaseKey(keyBackupFile, encryptedKeyHex);
+
+		assertFalse(accountManager.changePassword(password, newPassword));
+
+		assertEquals(encryptedKeyHex, loadDatabaseKey(keyFile));
+		assertEquals(encryptedKeyHex, loadDatabaseKey(keyBackupFile));
+	}
+
+	@Test
+	public void testChangePasswordReturnsTrueIfPasswordIsRight()
+			throws Exception {
+		context.checking(new Expectations() {{
+			oneOf(crypto).decryptWithPassword(encryptedKey, password);
+			will(returnValue(key.getBytes()));
+			oneOf(crypto).encryptWithPassword(key.getBytes(), newPassword);
+			will(returnValue(newEncryptedKey));
+		}});
+
+		storeDatabaseKey(keyFile, encryptedKeyHex);
+		storeDatabaseKey(keyBackupFile, encryptedKeyHex);
+
+		assertTrue(accountManager.changePassword(password, newPassword));
+
+		assertEquals(newEncryptedKeyHex, loadDatabaseKey(keyFile));
+		assertEquals(newEncryptedKeyHex, loadDatabaseKey(keyBackupFile));
+	}
+
+	private void storeDatabaseKey(File f, String hex) throws IOException {
+		f.getParentFile().mkdirs();
+		FileOutputStream out = new FileOutputStream(f);
+		out.write(hex.getBytes("UTF-8"));
+		out.flush();
+		out.close();
+	}
+
+	@Nullable
+	private String loadDatabaseKey(File f) throws IOException {
+		BufferedReader reader = new BufferedReader(new InputStreamReader(
+				new FileInputStream(f), "UTF-8"));
+		String hex = reader.readLine();
+		reader.close();
+		return hex;
+	}
+
+	@After
+	public void tearDown() {
+		deleteTestDirectory(testDir);
+	}
+}

bramble-core/src/test/java/org/briarproject/bramble/client/BdfMessageValidatorTest.java

@@ -16,8 +16,8 @@ import org.jmock.Expectations;
 import org.jmock.lib.legacy.ClassImposteriser;
 import org.junit.Test;
 
-import static org.briarproject.bramble.api.sync.SyncConstants.MESSAGE_HEADER_LENGTH;
 import static org.briarproject.bramble.api.transport.TransportConstants.MAX_CLOCK_DIFFERENCE;
+import static org.briarproject.bramble.test.TestUtils.getMessage;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertSame;
 
@@ -28,8 +28,7 @@ public class BdfMessageValidatorTest extends ValidatorTestCase {
 			new BdfMessageValidator(clientHelper, metadataEncoder, clock) {
 				@Override
 				protected BdfMessageContext validateMessage(Message m, Group g,
-						BdfList body)
-						throws InvalidMessageException, FormatException {
+						BdfList body) {
 					throw new AssertionError();
 				}
 			};
@@ -57,8 +56,7 @@ public class BdfMessageValidatorTest extends ValidatorTestCase {
 		context.checking(new Expectations() {{
 			oneOf(clock).currentTimeMillis();
 			will(returnValue(timestamp - MAX_CLOCK_DIFFERENCE));
-			oneOf(clientHelper).toList(raw, MESSAGE_HEADER_LENGTH,
-					raw.length - MESSAGE_HEADER_LENGTH);
+			oneOf(clientHelper).toList(message.getBody());
 			will(returnValue(body));
 			oneOf(metadataEncoder).encode(dictionary);
 			will(returnValue(meta));
@@ -69,7 +67,7 @@ public class BdfMessageValidatorTest extends ValidatorTestCase {
 				metadataEncoder, clock) {
 			@Override
 			protected BdfMessageContext validateMessage(Message m, Group g,
-					BdfList b) throws InvalidMessageException, FormatException {
+					BdfList b) {
 				assertSame(message, m);
 				assertSame(group, g);
 				assertSame(body, b);
@@ -83,17 +81,11 @@ public class BdfMessageValidatorTest extends ValidatorTestCase {
 
 	@Test(expected = InvalidMessageException.class)
 	public void testRejectsTooShortMessage() throws Exception {
-		byte[] invalidRaw = new byte[MESSAGE_HEADER_LENGTH];
-		// Use a mock message so the length of the raw message can be invalid
-		Message invalidMessage = context.mock(Message.class);
+		Message invalidMessage = getMessage(groupId, 0);
 
 		context.checking(new Expectations() {{
-			oneOf(invalidMessage).getTimestamp();
-			will(returnValue(timestamp));
 			oneOf(clock).currentTimeMillis();
 			will(returnValue(timestamp));
-			oneOf(invalidMessage).getRaw();
-			will(returnValue(invalidRaw));
 		}});
 
 		failIfSubclassIsCalled.validateMessage(invalidMessage, group);
@@ -101,15 +93,12 @@ public class BdfMessageValidatorTest extends ValidatorTestCase {
 
 	@Test
 	public void testAcceptsMinLengthMessage() throws Exception {
-		byte[] shortRaw = new byte[MESSAGE_HEADER_LENGTH + 1];
-		Message shortMessage =
-				new Message(messageId, groupId, timestamp, shortRaw);
+		Message shortMessage = getMessage(groupId, 1);
 
 		context.checking(new Expectations() {{
 			oneOf(clock).currentTimeMillis();
 			will(returnValue(timestamp));
-			oneOf(clientHelper).toList(shortRaw, MESSAGE_HEADER_LENGTH,
-					shortRaw.length - MESSAGE_HEADER_LENGTH);
+			oneOf(clientHelper).toList(shortMessage.getBody());
 			will(returnValue(body));
 			oneOf(metadataEncoder).encode(dictionary);
 			will(returnValue(meta));
@@ -120,7 +109,7 @@ public class BdfMessageValidatorTest extends ValidatorTestCase {
 				metadataEncoder, clock) {
 			@Override
 			protected BdfMessageContext validateMessage(Message m, Group g,
-					BdfList b) throws InvalidMessageException, FormatException {
+					BdfList b) {
 				assertSame(shortMessage, m);
 				assertSame(group, g);
 				assertSame(body, b);
@@ -137,8 +126,7 @@ public class BdfMessageValidatorTest extends ValidatorTestCase {
 		context.checking(new Expectations() {{
 			oneOf(clock).currentTimeMillis();
 			will(returnValue(timestamp));
-			oneOf(clientHelper).toList(raw, MESSAGE_HEADER_LENGTH,
-					raw.length - MESSAGE_HEADER_LENGTH);
+			oneOf(clientHelper).toList(message.getBody());
 			will(throwException(new FormatException()));
 		}});
 
@@ -150,8 +138,7 @@ public class BdfMessageValidatorTest extends ValidatorTestCase {
 		context.checking(new Expectations() {{
 			oneOf(clock).currentTimeMillis();
 			will(returnValue(timestamp));
-			oneOf(clientHelper).toList(raw, MESSAGE_HEADER_LENGTH,
-					raw.length - MESSAGE_HEADER_LENGTH);
+			oneOf(clientHelper).toList(message.getBody());
 			will(returnValue(body));
 		}});
 
@@ -160,7 +147,7 @@ public class BdfMessageValidatorTest extends ValidatorTestCase {
 				metadataEncoder, clock) {
 			@Override
 			protected BdfMessageContext validateMessage(Message m, Group g,
-					BdfList b) throws InvalidMessageException, FormatException {
+					BdfList b) throws FormatException {
 				throw new FormatException();
 			}
 		};

bramble-core/src/test/java/org/briarproject/bramble/client/ClientHelperImplTest.java

@@ -39,6 +39,7 @@ import static org.briarproject.bramble.api.identity.AuthorConstants.MAX_AUTHOR_N
 import static org.briarproject.bramble.api.identity.AuthorConstants.MAX_PUBLIC_KEY_LENGTH;
 import static org.briarproject.bramble.api.identity.AuthorConstants.MAX_SIGNATURE_LENGTH;
 import static org.briarproject.bramble.test.TestUtils.getAuthor;
+import static org.briarproject.bramble.test.TestUtils.getMessage;
 import static org.briarproject.bramble.test.TestUtils.getRandomBytes;
 import static org.briarproject.bramble.test.TestUtils.getRandomId;
 import static org.briarproject.bramble.util.StringUtils.getRandomString;
@@ -67,11 +68,9 @@ public class ClientHelperImplTest extends BrambleTestCase {
 
 	private final GroupId groupId = new GroupId(getRandomId());
 	private final BdfDictionary dictionary = new BdfDictionary();
-	private final long timestamp = 42L;
-	private final byte[] rawMessage = getRandomBytes(42);
-	private final MessageId messageId = new MessageId(getRandomId());
-	private final Message message =
-			new Message(messageId, groupId, timestamp, rawMessage);
+	private final Message message = getMessage(groupId);
+	private final MessageId messageId = message.getId();
+	private final long timestamp = message.getTimestamp();
 	private final Metadata metadata = new Metadata();
 	private final BdfList list = BdfList.of("Sign this!", getRandomBytes(42));
 	private final String label = StringUtils.getRandomString(5);
@@ -120,8 +119,8 @@ public class ClientHelperImplTest extends BrambleTestCase {
 		context.checking(new Expectations() {{
 			oneOf(db).startTransaction(true);
 			will(returnValue(txn));
-			oneOf(db).getRawMessage(txn, messageId);
-			will(returnValue(rawMessage));
+			oneOf(db).getMessage(txn, messageId);
+			will(returnValue(message));
 			oneOf(db).commitTransaction(txn);
 			oneOf(db).endTransaction(txn);
 		}});
@@ -267,7 +266,7 @@ public class ClientHelperImplTest extends BrambleTestCase {
 	public void testToList() throws Exception {
 		expectToList(true);
 
-		assertEquals(list, clientHelper.toList(rawMessage));
+		assertEquals(list, clientHelper.toList(getRandomBytes(123)));
 		context.assertIsSatisfied();
 	}
 
@@ -276,7 +275,7 @@ public class ClientHelperImplTest extends BrambleTestCase {
 		expectToList(false); // no EOF after list
 
 		try {
-			clientHelper.toList(rawMessage);
+			clientHelper.toList(getRandomBytes(123));
 			fail();
 		} catch (FormatException e) {
 			// expected

bramble-core/src/test/java/org/briarproject/bramble/crypto/ScryptKdfTest.java

@@ -11,6 +11,8 @@ import java.util.HashSet;
 import java.util.Set;
 
 import static junit.framework.TestCase.assertTrue;
+
+import org.briarproject.bramble.test.ArrayClock;
 import static org.briarproject.bramble.test.TestUtils.getRandomBytes;
 import static org.briarproject.bramble.util.StringUtils.getRandomString;
 import static org.junit.Assert.assertEquals;
@@ -74,24 +76,4 @@ public class ScryptKdfTest extends BrambleTestCase {
 		PasswordBasedKdf kdf = new ScryptKdf(clock);
 		assertEquals(256, kdf.chooseCostParameter());
 	}
-
-	private static class ArrayClock implements Clock {
-
-		private final long[] times;
-		private int index = 0;
-
-		private ArrayClock(long... times) {
-			this.times = times;
-		}
-
-		@Override
-		public long currentTimeMillis() {
-			return times[index++];
-		}
-
-		@Override
-		public void sleep(long milliseconds) throws InterruptedException {
-			Thread.sleep(milliseconds);
-		}
-	}
 }

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

@@ -64,6 +64,7 @@ import static java.util.Collections.singletonList;
 import static org.briarproject.bramble.api.sync.Group.Visibility.INVISIBLE;
 import static org.briarproject.bramble.api.sync.Group.Visibility.SHARED;
 import static org.briarproject.bramble.api.sync.Group.Visibility.VISIBLE;
+import static org.briarproject.bramble.api.sync.SyncConstants.MAX_MESSAGE_LENGTH;
 import static org.briarproject.bramble.api.sync.ValidationManager.State.DELIVERED;
 import static org.briarproject.bramble.api.sync.ValidationManager.State.UNKNOWN;
 import static org.briarproject.bramble.api.transport.TransportConstants.REORDERING_WINDOW_SIZE;
@@ -72,6 +73,7 @@ import static org.briarproject.bramble.test.TestUtils.getAuthor;
 import static org.briarproject.bramble.test.TestUtils.getClientId;
 import static org.briarproject.bramble.test.TestUtils.getGroup;
 import static org.briarproject.bramble.test.TestUtils.getLocalAuthor;
+import static org.briarproject.bramble.test.TestUtils.getMessage;
 import static org.briarproject.bramble.test.TestUtils.getRandomId;
 import static org.briarproject.bramble.test.TestUtils.getSecretKey;
 import static org.briarproject.bramble.test.TestUtils.getTransportId;
@@ -89,6 +91,7 @@ public class DatabaseComponentImplTest extends BrambleMockTestCase {
 			context.mock(ShutdownManager.class);
 	private final EventBus eventBus = context.mock(EventBus.class);
 
+	private final SecretKey key = getSecretKey();
 	private final Object txn = new Object();
 	private final ClientId clientId;
 	private final int majorVersion;
@@ -96,10 +99,8 @@ public class DatabaseComponentImplTest extends BrambleMockTestCase {
 	private final Group group;
 	private final Author author;
 	private final LocalAuthor localAuthor;
+	private final Message message, message1;
 	private final MessageId messageId, messageId1;
-	private final int size;
-	private final byte[] raw;
-	private final Message message;
 	private final Metadata metadata;
 	private final TransportId transportId;
 	private final int maxLatency;
@@ -114,12 +115,10 @@ public class DatabaseComponentImplTest extends BrambleMockTestCase {
 		groupId = group.getId();
 		author = getAuthor();
 		localAuthor = getLocalAuthor();
-		messageId = new MessageId(getRandomId());
-		messageId1 = new MessageId(getRandomId());
-		long timestamp = System.currentTimeMillis();
-		size = 1234;
-		raw = new byte[size];
-		message = new Message(messageId, groupId, timestamp, raw);
+		message = getMessage(groupId);
+		message1 = getMessage(groupId);
+		messageId = message.getId();
+		messageId1 = message1.getId();
 		metadata = new Metadata();
 		metadata.put("foo", new byte[] {'b', 'a', 'r'});
 		transportId = getTransportId();
@@ -141,7 +140,7 @@ public class DatabaseComponentImplTest extends BrambleMockTestCase {
 		int shutdownHandle = 12345;
 		context.checking(new Expectations() {{
 			// open()
-			oneOf(database).open(null);
+			oneOf(database).open(key, null);
 			will(returnValue(false));
 			oneOf(shutdown).addShutdownHook(with(any(Runnable.class)));
 			will(returnValue(shutdownHandle));
@@ -208,7 +207,7 @@ public class DatabaseComponentImplTest extends BrambleMockTestCase {
 		DatabaseComponent db = createDatabaseComponent(database, eventBus,
 				shutdown);
 
-		assertFalse(db.open(null));
+		assertFalse(db.open(key, null));
 		Transaction transaction = db.startTransaction(false);
 		try {
 			db.addLocalAuthor(transaction, localAuthor);
@@ -645,7 +644,7 @@ public class DatabaseComponentImplTest extends BrambleMockTestCase {
 
 		transaction = db.startTransaction(false);
 		try {
-			db.getRawMessage(transaction, messageId);
+			db.getMessage(transaction, messageId);
 			fail();
 		} catch (NoSuchMessageException expected) {
 			// Expected
@@ -864,23 +863,23 @@ public class DatabaseComponentImplTest extends BrambleMockTestCase {
 
 	@Test
 	public void testGenerateBatch() throws Exception {
-		byte[] raw1 = new byte[size];
 		Collection<MessageId> ids = Arrays.asList(messageId, messageId1);
-		Collection<byte[]> messages = Arrays.asList(raw, raw1);
+		Collection<Message> messages = Arrays.asList(message, message1);
 		context.checking(new Expectations() {{
 			oneOf(database).startTransaction();
 			will(returnValue(txn));
 			oneOf(database).containsContact(txn, contactId);
 			will(returnValue(true));
-			oneOf(database).getMessagesToSend(txn, contactId, size * 2);
+			oneOf(database).getMessagesToSend(txn, contactId,
+					MAX_MESSAGE_LENGTH * 2, maxLatency);
 			will(returnValue(ids));
-			oneOf(database).getRawMessage(txn, messageId);
-			will(returnValue(raw));
-			oneOf(database).updateExpiryTime(txn, contactId, messageId,
+			oneOf(database).getMessage(txn, messageId);
+			will(returnValue(message));
+			oneOf(database).updateExpiryTimeAndEta(txn, contactId, messageId,
 					maxLatency);
-			oneOf(database).getRawMessage(txn, messageId1);
-			will(returnValue(raw1));
-			oneOf(database).updateExpiryTime(txn, contactId, messageId1,
+			oneOf(database).getMessage(txn, messageId1);
+			will(returnValue(message1));
+			oneOf(database).updateExpiryTimeAndEta(txn, contactId, messageId1,
 					maxLatency);
 			oneOf(database).lowerRequestedFlag(txn, contactId, ids);
 			oneOf(database).commitTransaction(txn);
@@ -892,7 +891,7 @@ public class DatabaseComponentImplTest extends BrambleMockTestCase {
 		Transaction transaction = db.startTransaction(false);
 		try {
 			assertEquals(messages, db.generateBatch(transaction, contactId,
-					size * 2, maxLatency));
+					MAX_MESSAGE_LENGTH * 2, maxLatency));
 			db.commitTransaction(transaction);
 		} finally {
 			db.endTransaction(transaction);
@@ -908,11 +907,11 @@ public class DatabaseComponentImplTest extends BrambleMockTestCase {
 			will(returnValue(txn));
 			oneOf(database).containsContact(txn, contactId);
 			will(returnValue(true));
-			oneOf(database).getMessagesToOffer(txn, contactId, 123);
+			oneOf(database).getMessagesToOffer(txn, contactId, 123, maxLatency);
 			will(returnValue(ids));
-			oneOf(database).updateExpiryTime(txn, contactId, messageId,
+			oneOf(database).updateExpiryTimeAndEta(txn, contactId, messageId,
 					maxLatency);
-			oneOf(database).updateExpiryTime(txn, contactId, messageId1,
+			oneOf(database).updateExpiryTimeAndEta(txn, contactId, messageId1,
 					maxLatency);
 			oneOf(database).commitTransaction(txn);
 		}});
@@ -960,24 +959,23 @@ public class DatabaseComponentImplTest extends BrambleMockTestCase {
 
 	@Test
 	public void testGenerateRequestedBatch() throws Exception {
-		byte[] raw1 = new byte[size];
 		Collection<MessageId> ids = Arrays.asList(messageId, messageId1);
-		Collection<byte[]> messages = Arrays.asList(raw, raw1);
+		Collection<Message> messages = Arrays.asList(message, message1);
 		context.checking(new Expectations() {{
 			oneOf(database).startTransaction();
 			will(returnValue(txn));
 			oneOf(database).containsContact(txn, contactId);
 			will(returnValue(true));
 			oneOf(database).getRequestedMessagesToSend(txn, contactId,
-					size * 2);
+					MAX_MESSAGE_LENGTH * 2, maxLatency);
 			will(returnValue(ids));
-			oneOf(database).getRawMessage(txn, messageId);
-			will(returnValue(raw));
-			oneOf(database).updateExpiryTime(txn, contactId, messageId,
+			oneOf(database).getMessage(txn, messageId);
+			will(returnValue(message));
+			oneOf(database).updateExpiryTimeAndEta(txn, contactId, messageId,
 					maxLatency);
-			oneOf(database).getRawMessage(txn, messageId1);
-			will(returnValue(raw1));
-			oneOf(database).updateExpiryTime(txn, contactId, messageId1,
+			oneOf(database).getMessage(txn, messageId1);
+			will(returnValue(message1));
+			oneOf(database).updateExpiryTimeAndEta(txn, contactId, messageId1,
 					maxLatency);
 			oneOf(database).lowerRequestedFlag(txn, contactId, ids);
 			oneOf(database).commitTransaction(txn);
@@ -989,7 +987,7 @@ public class DatabaseComponentImplTest extends BrambleMockTestCase {
 		Transaction transaction = db.startTransaction(false);
 		try {
 			assertEquals(messages, db.generateRequestedBatch(transaction,
-					contactId, size * 2, maxLatency));
+					contactId, MAX_MESSAGE_LENGTH * 2, maxLatency));
 			db.commitTransaction(transaction);
 		} finally {
 			db.endTransaction(transaction);
@@ -1602,7 +1600,7 @@ public class DatabaseComponentImplTest extends BrambleMockTestCase {
 		MessageId messageId2 = new MessageId(getRandomId());
 		context.checking(new Expectations() {{
 			// open()
-			oneOf(database).open(null);
+			oneOf(database).open(key, null);
 			will(returnValue(false));
 			oneOf(shutdown).addShutdownHook(with(any(Runnable.class)));
 			will(returnValue(shutdownHandle));
@@ -1646,7 +1644,7 @@ public class DatabaseComponentImplTest extends BrambleMockTestCase {
 		DatabaseComponent db = createDatabaseComponent(database, eventBus,
 				shutdown);
 
-		assertFalse(db.open(null));
+		assertFalse(db.open(key, null));
 		Transaction transaction = db.startTransaction(false);
 		try {
 			db.addLocalMessage(transaction, message, metadata, true);

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

@@ -1,15 +1,18 @@
 package org.briarproject.bramble.db;
 
+import org.briarproject.bramble.api.crypto.SecretKey;
 import org.briarproject.bramble.api.db.DataTooNewException;
 import org.briarproject.bramble.api.db.DataTooOldException;
 import org.briarproject.bramble.api.db.DatabaseConfig;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.settings.Settings;
+import org.briarproject.bramble.api.sync.MessageFactory;
 import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.bramble.system.SystemClock;
 import org.briarproject.bramble.test.BrambleMockTestCase;
 import org.briarproject.bramble.test.TestDatabaseConfig;
+import org.briarproject.bramble.test.TestMessageFactory;
 import org.briarproject.bramble.test.TestUtils;
 import org.jmock.Expectations;
 import org.junit.After;
@@ -26,6 +29,7 @@ import static java.util.Collections.singletonList;
 import static org.briarproject.bramble.db.DatabaseConstants.DB_SETTINGS_NAMESPACE;
 import static org.briarproject.bramble.db.DatabaseConstants.SCHEMA_VERSION_KEY;
 import static org.briarproject.bramble.db.JdbcDatabase.CODE_SCHEMA_VERSION;
+import static org.briarproject.bramble.test.TestUtils.getSecretKey;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
@@ -43,6 +47,8 @@ public abstract class DatabaseMigrationTest extends BrambleMockTestCase {
 
 	protected final DatabaseConfig config =
 			new TestDatabaseConfig(testDir, 1024 * 1024);
+	protected final MessageFactory messageFactory = new TestMessageFactory();
+	protected final SecretKey key = getSecretKey();
 	protected final Clock clock = new SystemClock();
 
 	abstract Database<Connection> createDatabase(
@@ -62,7 +68,7 @@ public abstract class DatabaseMigrationTest extends BrambleMockTestCase {
 	public void testDoesNotRunMigrationsWhenCreatingDatabase()
 			throws Exception {
 		Database<Connection> db = createDatabase(singletonList(migration));
-		assertFalse(db.open(null));
+		assertFalse(db.open(key, null));
 		assertEquals(CODE_SCHEMA_VERSION, getDataSchemaVersion(db));
 		db.close();
 	}
@@ -72,14 +78,14 @@ public abstract class DatabaseMigrationTest extends BrambleMockTestCase {
 			throws Exception {
 		// Open the DB for the first time
 		Database<Connection> db = createDatabase(asList(migration, migration1));
-		assertFalse(db.open(null));
+		assertFalse(db.open(key, null));
 		assertEquals(CODE_SCHEMA_VERSION, getDataSchemaVersion(db));
 		// Override the data schema version
 		setDataSchemaVersion(db, -1);
 		db.close();
 		// Reopen the DB - an exception should be thrown
 		db = createDatabase(asList(migration, migration1));
-		db.open(null);
+		db.open(key, null);
 	}
 
 	@Test
@@ -87,12 +93,12 @@ public abstract class DatabaseMigrationTest extends BrambleMockTestCase {
 			throws Exception {
 		// Open the DB for the first time
 		Database<Connection> db = createDatabase(asList(migration, migration1));
-		assertFalse(db.open(null));
+		assertFalse(db.open(key, null));
 		assertEquals(CODE_SCHEMA_VERSION, getDataSchemaVersion(db));
 		db.close();
 		// Reopen the DB - migrations should not be run
 		db = createDatabase(asList(migration, migration1));
-		assertTrue(db.open(null));
+		assertTrue(db.open(key, null));
 		assertEquals(CODE_SCHEMA_VERSION, getDataSchemaVersion(db));
 		db.close();
 	}
@@ -101,14 +107,14 @@ public abstract class DatabaseMigrationTest extends BrambleMockTestCase {
 	public void testThrowsExceptionIfDataIsNewerThanCode() throws Exception {
 		// Open the DB for the first time
 		Database<Connection> db = createDatabase(asList(migration, migration1));
-		assertFalse(db.open(null));
+		assertFalse(db.open(key, null));
 		assertEquals(CODE_SCHEMA_VERSION, getDataSchemaVersion(db));
 		// Override the data schema version
 		setDataSchemaVersion(db, CODE_SCHEMA_VERSION + 1);
 		db.close();
 		// Reopen the DB - an exception should be thrown
 		db = createDatabase(asList(migration, migration1));
-		db.open(null);
+		db.open(key, null);
 	}
 
 	@Test(expected = DataTooOldException.class)
@@ -116,13 +122,13 @@ public abstract class DatabaseMigrationTest extends BrambleMockTestCase {
 			throws Exception {
 		// Open the DB for the first time
 		Database<Connection> db = createDatabase(emptyList());
-		assertFalse(db.open(null));
+		assertFalse(db.open(key, null));
 		assertEquals(CODE_SCHEMA_VERSION, getDataSchemaVersion(db));
 		setDataSchemaVersion(db, CODE_SCHEMA_VERSION - 1);
 		db.close();
 		// Reopen the DB - an exception should be thrown
 		db = createDatabase(emptyList());
-		db.open(null);
+		db.open(key, null);
 	}
 
 	@Test(expected = DataTooOldException.class)
@@ -141,14 +147,14 @@ public abstract class DatabaseMigrationTest extends BrambleMockTestCase {
 
 		// Open the DB for the first time
 		Database<Connection> db = createDatabase(asList(migration, migration1));
-		assertFalse(db.open(null));
+		assertFalse(db.open(key, null));
 		assertEquals(CODE_SCHEMA_VERSION, getDataSchemaVersion(db));
 		// Override the data schema version
 		setDataSchemaVersion(db, CODE_SCHEMA_VERSION - 3);
 		db.close();
 		// Reopen the DB - an exception should be thrown
 		db = createDatabase(asList(migration, migration1));
-		db.open(null);
+		db.open(key, null);
 	}
 
 	@Test
@@ -170,14 +176,14 @@ public abstract class DatabaseMigrationTest extends BrambleMockTestCase {
 
 		// Open the DB for the first time
 		Database<Connection> db = createDatabase(asList(migration, migration1));
-		assertFalse(db.open(null));
+		assertFalse(db.open(key, null));
 		assertEquals(CODE_SCHEMA_VERSION, getDataSchemaVersion(db));
 		// Override the data schema version
 		setDataSchemaVersion(db, CODE_SCHEMA_VERSION - 2);
 		db.close();
 		// Reopen the DB - the first migration should be run
 		db = createDatabase(asList(migration, migration1));
-		assertTrue(db.open(null));
+		assertTrue(db.open(key, null));
 		assertEquals(CODE_SCHEMA_VERSION, getDataSchemaVersion(db));
 		db.close();
 	}
@@ -202,14 +208,14 @@ public abstract class DatabaseMigrationTest extends BrambleMockTestCase {
 
 		// Open the DB for the first time
 		Database<Connection> db = createDatabase(asList(migration, migration1));
-		assertFalse(db.open(null));
+		assertFalse(db.open(key, null));
 		assertEquals(CODE_SCHEMA_VERSION, getDataSchemaVersion(db));
 		// Override the data schema version
 		setDataSchemaVersion(db, CODE_SCHEMA_VERSION - 2);
 		db.close();
 		// Reopen the DB - both migrations should be run
 		db = createDatabase(asList(migration, migration1));
-		assertTrue(db.open(null));
+		assertTrue(db.open(key, null));
 		assertEquals(CODE_SCHEMA_VERSION, getDataSchemaVersion(db));
 		db.close();
 	}