Move task to back rather than showing home screen.

Do not show sign-in reminder once PasswordActivity was opened

Closes #47

See merge request briar/briar!879

.gitignore

@@ -9,15 +9,20 @@ Thumbs.db
 .DS_Store
 
 # Eclipse project files
-#.classpath
-#.project
+.classpath
+.project
+.settings
 
 # Local configuration file (sdk path, etc)
 local.properties
 
 # Android Studio
 .idea/*
+!.idea/runConfigurations/
 !.idea/codeStyleSettings.xml
+!.idea/codeStyles
 .gradle
 build/
+captures
 *.iml
+projectFilesBackup/

.gitlab-ci.yml

@@ -0,0 +1,27 @@
+image: briar/ci-image-android:latest
+
+test:
+  before_script:
+    - set -e
+    - export GRADLE_USER_HOME=$PWD/.gradle
+
+  cache:
+    paths:
+      - .gradle/wrapper
+      - .gradle/caches
+
+  script:
+    - ./gradlew --no-daemon animalSnifferMain animalSnifferTest
+    - ./gradlew --no-daemon test
+
+  after_script:
+    # these file change every time but should not be cached
+    - rm -f $GRADLE_USER_HOME/caches/modules-2/modules-2.lock
+    - rm -fr $GRADLE_USER_HOME/caches/*/plugin-resolution/
+
+
+test_reproducible:
+  script:
+    - "curl -X POST -F token=${RELEASE_CHECK_TOKEN} -F ref=master -F variables[RELEASE_TAG]=${CI_COMMIT_REF_NAME} https://code.briarproject.org/api/v4/projects/61/trigger/pipeline"
+  only:
+    - tags

.idea/codeStyleSettings.xml

@@ -31,12 +31,42 @@
           </value>
         </option>
         <option name="RIGHT_MARGIN" value="100" />
+        <option name="JD_ALIGN_PARAM_COMMENTS" value="false" />
+        <option name="JD_ALIGN_EXCEPTION_COMMENTS" value="false" />
         <AndroidXmlCodeStyleSettings>
           <option name="USE_CUSTOM_SETTINGS" value="true" />
         </AndroidXmlCodeStyleSettings>
         <JavaCodeStyleSettings>
           <option name="ANNOTATION_PARAMETER_WRAP" value="1" />
         </JavaCodeStyleSettings>
+        <Objective-C-extensions>
+          <option name="GENERATE_INSTANCE_VARIABLES_FOR_PROPERTIES" value="ASK" />
+          <option name="RELEASE_STYLE" value="IVAR" />
+          <option name="TYPE_QUALIFIERS_PLACEMENT" value="BEFORE" />
+          <file>
+            <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Import" />
+            <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Macro" />
+            <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Typedef" />
+            <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Enum" />
+            <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Constant" />
+            <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Global" />
+            <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Struct" />
+            <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="FunctionPredecl" />
+            <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Function" />
+          </file>
+          <class>
+            <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Property" />
+            <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Synthesize" />
+            <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="InitMethod" />
+            <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="StaticMethod" />
+            <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="InstanceMethod" />
+            <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="DeallocMethod" />
+          </class>
+          <extensions>
+            <pair source="cpp" header="h" />
+            <pair source="c" header="h" />
+          </extensions>
+        </Objective-C-extensions>
         <XML>
           <option name="XML_LEGACY_SETTINGS_IMPORTED" value="true" />
         </XML>

.idea/codeStyles/Project.xml

@@ -0,0 +1,261 @@
+<component name="ProjectCodeStyleConfiguration">
+  <code_scheme name="Project" version="173">
+    <option name="RIGHT_MARGIN" value="100" />
+    <AndroidXmlCodeStyleSettings>
+      <option name="USE_CUSTOM_SETTINGS" value="true" />
+    </AndroidXmlCodeStyleSettings>
+    <JavaCodeStyleSettings>
+      <option name="ANNOTATION_PARAMETER_WRAP" value="1" />
+      <option name="CLASS_COUNT_TO_USE_IMPORT_ON_DEMAND" value="99" />
+      <option name="NAMES_COUNT_TO_USE_IMPORT_ON_DEMAND" value="99" />
+      <option name="PACKAGES_TO_USE_IMPORT_ON_DEMAND">
+        <value />
+      </option>
+      <option name="IMPORT_LAYOUT_TABLE">
+        <value>
+          <package name="android" withSubpackages="true" static="false" />
+          <emptyLine />
+          <package name="com" withSubpackages="true" static="false" />
+          <emptyLine />
+          <package name="junit" withSubpackages="true" static="false" />
+          <emptyLine />
+          <package name="net" withSubpackages="true" static="false" />
+          <emptyLine />
+          <package name="org" withSubpackages="true" static="false" />
+          <emptyLine />
+          <package name="java" withSubpackages="true" static="false" />
+          <emptyLine />
+          <package name="javax" withSubpackages="true" static="false" />
+          <emptyLine />
+          <package name="" withSubpackages="true" static="false" />
+          <emptyLine />
+          <package name="" withSubpackages="true" static="true" />
+          <emptyLine />
+        </value>
+      </option>
+      <option name="JD_ALIGN_PARAM_COMMENTS" value="false" />
+      <option name="JD_ALIGN_EXCEPTION_COMMENTS" value="false" />
+    </JavaCodeStyleSettings>
+    <Objective-C-extensions>
+      <file>
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Import" />
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Macro" />
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Typedef" />
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Enum" />
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Constant" />
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Global" />
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Struct" />
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="FunctionPredecl" />
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Function" />
+      </file>
+      <class>
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Property" />
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="Synthesize" />
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="InitMethod" />
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="StaticMethod" />
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="InstanceMethod" />
+        <option name="com.jetbrains.cidr.lang.util.OCDeclarationKind" value="DeallocMethod" />
+      </class>
+      <extensions>
+        <pair source="cpp" header="h" fileNamingConvention="NONE" />
+        <pair source="c" header="h" fileNamingConvention="NONE" />
+      </extensions>
+    </Objective-C-extensions>
+    <XML>
+      <option name="XML_LEGACY_SETTINGS_IMPORTED" value="true" />
+    </XML>
+    <codeStyleSettings language="Groovy">
+      <indentOptions>
+        <option name="USE_TAB_CHARACTER" value="true" />
+        <option name="SMART_TABS" value="true" />
+      </indentOptions>
+    </codeStyleSettings>
+    <codeStyleSettings language="JAVA">
+      <option name="RIGHT_MARGIN" value="80" />
+      <option name="ALIGN_MULTILINE_PARAMETERS" value="false" />
+      <option name="ALIGN_MULTILINE_RESOURCES" value="false" />
+      <option name="ALIGN_MULTILINE_FOR" value="false" />
+      <option name="SPACE_BEFORE_ARRAY_INITIALIZER_LBRACE" value="true" />
+      <option name="CALL_PARAMETERS_WRAP" value="1" />
+      <option name="METHOD_PARAMETERS_WRAP" value="1" />
+      <option name="RESOURCE_LIST_WRAP" value="1" />
+      <option name="EXTENDS_LIST_WRAP" value="1" />
+      <option name="THROWS_LIST_WRAP" value="1" />
+      <option name="EXTENDS_KEYWORD_WRAP" value="1" />
+      <option name="THROWS_KEYWORD_WRAP" value="1" />
+      <option name="METHOD_CALL_CHAIN_WRAP" value="1" />
+      <option name="BINARY_OPERATION_WRAP" value="1" />
+      <option name="TERNARY_OPERATION_WRAP" value="1" />
+      <option name="FOR_STATEMENT_WRAP" value="1" />
+      <option name="ARRAY_INITIALIZER_WRAP" value="1" />
+      <option name="ASSIGNMENT_WRAP" value="1" />
+      <option name="ASSERT_STATEMENT_WRAP" value="1" />
+      <option name="PARAMETER_ANNOTATION_WRAP" value="1" />
+      <option name="VARIABLE_ANNOTATION_WRAP" value="1" />
+      <option name="ENUM_CONSTANTS_WRAP" value="1" />
+      <indentOptions>
+        <option name="USE_TAB_CHARACTER" value="true" />
+        <option name="SMART_TABS" value="true" />
+      </indentOptions>
+    </codeStyleSettings>
+    <codeStyleSettings language="XML">
+      <option name="FORCE_REARRANGE_MODE" value="1" />
+      <indentOptions>
+        <option name="CONTINUATION_INDENT_SIZE" value="4" />
+        <option name="USE_TAB_CHARACTER" value="true" />
+        <option name="SMART_TABS" value="true" />
+      </indentOptions>
+      <arrangement>
+        <rules>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>xmlns:android</NAME>
+                  <XML_NAMESPACE>Namespace:</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>xmlns:.*</NAME>
+                  <XML_NAMESPACE>Namespace:</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>BY_NAME</order>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*:id</NAME>
+                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*:name</NAME>
+                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>name</NAME>
+                  <XML_NAMESPACE>^$</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>style</NAME>
+                  <XML_NAMESPACE>^$</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*</NAME>
+                  <XML_NAMESPACE>^$</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>BY_NAME</order>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*:layout_width</NAME>
+                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*:layout_height</NAME>
+                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                </AND>
+              </match>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*:layout_.*</NAME>
+                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>BY_NAME</order>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*:width</NAME>
+                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>BY_NAME</order>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*:height</NAME>
+                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>BY_NAME</order>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*</NAME>
+                  <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>BY_NAME</order>
+            </rule>
+          </section>
+          <section>
+            <rule>
+              <match>
+                <AND>
+                  <NAME>.*</NAME>
+                  <XML_NAMESPACE>.*</XML_NAMESPACE>
+                </AND>
+              </match>
+              <order>BY_NAME</order>
+            </rule>
+          </section>
+        </rules>
+      </arrangement>
+    </codeStyleSettings>
+  </code_scheme>
+</component>

.idea/codeStyles/codeStyleConfig.xml

@@ -0,0 +1,5 @@
+<component name="ProjectCodeStyleConfiguration">
+  <state>
+    <option name="USE_PER_PROJECT_SETTINGS" value="true" />
+  </state>
+</component>

.idea/runConfigurations/All_tests.xml

@@ -0,0 +1,29 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="All tests" type="AndroidJUnit" factoryName="Android JUnit">
+    <extension name="coverage" enabled="false" merge="false" sample_coverage="true" runner="idea" />
+    <module name="briar-android" />
+    <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
+    <option name="ALTERNATIVE_JRE_PATH" />
+    <option name="PACKAGE_NAME" value="" />
+    <option name="MAIN_CLASS_NAME" value="" />
+    <option name="METHOD_NAME" value="" />
+    <option name="TEST_OBJECT" value="package" />
+    <option name="VM_PARAMETERS" value="-ea" />
+    <option name="PARAMETERS" value="" />
+    <option name="WORKING_DIRECTORY" value="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>
+      <option name="RunConfigurationTask" enabled="true" run_configuration_name="All tests in bramble-api" run_configuration_type="AndroidJUnit" />
+      <option name="RunConfigurationTask" enabled="true" run_configuration_name="All tests in bramble-core" run_configuration_type="AndroidJUnit" />
+      <option name="RunConfigurationTask" enabled="true" run_configuration_name="All tests in bramble-android" run_configuration_type="AndroidJUnit" />
+      <option name="RunConfigurationTask" enabled="true" run_configuration_name="All tests in bramble-j2se" run_configuration_type="AndroidJUnit" />
+      <option name="RunConfigurationTask" enabled="true" run_configuration_name="All tests in briar-core" run_configuration_type="AndroidJUnit" />
+    </method>
+  </configuration>
+</component>

.idea/runConfigurations/All_tests_in_bramble_android.xml

@@ -0,0 +1,23 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="All tests in bramble-android" type="AndroidJUnit" factoryName="Android JUnit">
+    <extension name="coverage" enabled="false" merge="false" sample_coverage="true" runner="idea" />
+    <module name="bramble-android" />
+    <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
+    <option name="ALTERNATIVE_JRE_PATH" />
+    <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="ENV_VARIABLES" />
+    <option name="PASS_PARENT_ENVS" value="true" />
+    <option name="TEST_SEARCH_SCOPE">
+      <value defaultName="singleModule" />
+    </option>
+    <envs />
+    <patterns />
+    <method />
+  </configuration>
+</component>

.idea/runConfigurations/All_tests_in_bramble_api.xml

@@ -0,0 +1,23 @@
+<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" />
+    <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-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>
+</component>

.idea/runConfigurations/All_tests_in_bramble_core.xml

@@ -0,0 +1,23 @@
+<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" />
+    <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-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>
+</component>

.idea/runConfigurations/All_tests_in_bramble_j2se.xml

@@ -0,0 +1,23 @@
+<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" />
+    <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 -Djava.library.path=libs" />
+    <option name="PARAMETERS" value="" />
+    <option name="WORKING_DIRECTORY" value="file://$PROJECT_DIR$/bramble-j2se" />
+    <option name="ENV_VARIABLES" />
+    <option name="PASS_PARENT_ENVS" value="true" />
+    <option name="TEST_SEARCH_SCOPE">
+      <value defaultName="singleModule" />
+    </option>
+    <envs />
+    <patterns />
+    <method />
+  </configuration>
+</component>

.idea/runConfigurations/All_tests_in_briar_android.xml

@@ -0,0 +1,23 @@
+<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" />
+    <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://$PROJECT_DIR$/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>
+</component>

.idea/runConfigurations/All_tests_in_briar_core.xml

@@ -0,0 +1,23 @@
+<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" />
+    <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://$PROJECT_DIR$/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>
+</component>

.idea/runConfigurations/H2_Performance_Test.xml

@@ -0,0 +1,23 @@
+<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" />
+    <option name="PACKAGE_NAME" value="org.briarproject.bramble.db" />
+    <option name="MAIN_CLASS_NAME" value="org.briarproject.bramble.db.H2DatabasePerformanceTest" />
+    <option name="METHOD_NAME" value="" />
+    <option name="TEST_OBJECT" value="class" />
+    <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>
+</component>

.idea/runConfigurations/HyperSQL_Performance_Test.xml

@@ -0,0 +1,23 @@
+<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" />
+    <option name="PACKAGE_NAME" value="org.briarproject.bramble.db" />
+    <option name="MAIN_CLASS_NAME" value="org.briarproject.bramble.db.HyperSqlDatabasePerformanceTest" />
+    <option name="METHOD_NAME" value="" />
+    <option name="TEST_OBJECT" value="class" />
+    <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>
+</component>

LICENSE.txt

@@ -13,23 +13,6 @@
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
--------------------------------------------------------------------------
-
-    All files under the directories briar-android/src, briar-api/src,
-    briar-core/src, briar-desktop/src and briar-test/src are licensed
-    under the Apache License, version 2.0 (the "License"); you may not
-    use these files except in compliance with the License.
-
-    You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-    Unless required by applicable law or agreed to in writing, software
-    distributed under the License is distributed on an "AS IS" BASIS,
-    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
-    implied. See the License for the specific language governing
-    permissions and limitations under the License.
-
 -------------------------------------------------------------------------
 
                     GNU GENERAL PUBLIC LICENSE

bramble-android/.gitignore

@@ -0,0 +1,5 @@
+bin
+gen
+build
+.settings
+src/main/res/raw/*.zip

bramble-android/build.gradle

@@ -0,0 +1,153 @@
+apply plugin: 'com.android.library'
+apply plugin: 'witness'
+
+android {
+	compileSdkVersion 27
+	buildToolsVersion '27.0.3'
+
+	defaultConfig {
+		minSdkVersion 14
+		targetSdkVersion 26
+		versionCode 10013
+		versionName "1.0.13"
+		consumerProguardFiles 'proguard-rules.txt'
+
+		testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+	}
+
+	compileOptions {
+		sourceCompatibility JavaVersion.VERSION_1_8
+		targetCompatibility JavaVersion.VERSION_1_8
+	}
+}
+
+configurations {
+	tor
+}
+
+dependencies {
+	implementation project(path: ':bramble-core', configuration: 'default')
+	implementation 'org.briarproject:jtorctl:0.3'
+	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'
+
+	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"
+
+	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 = [
+			'cglib:cglib:3.2.0:cglib-3.2.0.jar:adb13bab79712ad6bdf1bd59f2a3918018a8016e722e8a357065afb9e6690861',
+			'com.android.support.test:monitor:1.0.2:monitor-1.0.2.aar:38ef4fa98a32dc55550ff49bb36a583e178b3a9b830fcb8dcc27bfc4254bc2bc',
+			'com.android.support.test:runner:1.0.2:runner-1.0.2.aar:f04b9ae342975ba1cb3e4a06e13426e3e6b8a73faa45acba604493d83c9a4f00',
+			'com.android.support:support-annotations:27.1.1:support-annotations-27.1.1.jar:3365960206c3d2b09e845f555e7f88f8effc8d2f00b369e66c4be384029299cf',
+			'com.android.tools.analytics-library:protos:26.1.3:protos-26.1.3.jar:818c9f256f141d9dafec03a1aa2b94d240b2c140acfd7ee31a8b3e6c2b9479e3',
+			'com.android.tools.analytics-library:shared:26.1.3:shared-26.1.3.jar:7110706c7ada96c8b6f5ca80c478291bc7899d46277de2c48527e045442401a3',
+			'com.android.tools.analytics-library:tracker:26.1.3:tracker-26.1.3.jar:4155424bf2ce4872da83332579a1707252bc66cbd77c5144fdc4483d0f2e1418',
+			'com.android.tools.build:apksig:3.1.3:apksig-3.1.3.jar:7e1f8e675a6e768e5b56405e41d6c3cc05befe62e601b04177de1029902c9c89',
+			'com.android.tools.build:builder-model:3.1.3:builder-model-3.1.3.jar:06ad1c422d679fc698451479cb40ba863849d67bfd1de23f6d2c16d78b024b0b',
+			'com.android.tools.build:builder-test-api:3.1.3:builder-test-api-3.1.3.jar:4d989f780436794f0f8b2f50e9e079b786571eac90f26c208ab2ae6d4012f389',
+			'com.android.tools.build:builder:3.1.3:builder-3.1.3.jar:8a1092012c89d0ec1ee2eff09c5708c71ef4482a6862df8d3a44a67fccace01c',
+			'com.android.tools.build:gradle-api:3.1.3:gradle-api-3.1.3.jar:01e4df521456aef66514336f1d492346730dd1fb8f6433a89f62da834941ed72',
+			'com.android.tools.build:manifest-merger:26.1.3:manifest-merger-26.1.3.jar:1e4fc7e932adb4607082409800e5e6fccb42e6c5360ae5990094bf522f3ada55',
+			'com.android.tools.ddms:ddmlib:26.1.3:ddmlib-26.1.3.jar:c54931cd68df5d1ea2923b3b320eae47cd2307a5a916bb8674c0acf93cd1d3cd',
+			'com.android.tools.external.com-intellij:intellij-core:26.1.3:intellij-core-26.1.3.jar:af67f5535fef2e1a28b1007a4acb8c5deb6a1e33b8afe7b11d012c9e778ebcec',
+			'com.android.tools.external.com-intellij:kotlin-compiler:26.1.3:kotlin-compiler-26.1.3.jar:c746d2859dc11cc05c84b692b3498d3a621e0929511f8440ee009c6557838fd4',
+			'com.android.tools.external.org-jetbrains:uast:26.1.3:uast-26.1.3.jar:3f3f6651d0c7685a77ecb22e9c82d6b49fdf24322c17360768dc530678f43265',
+			'com.android.tools.layoutlib:layoutlib-api:26.1.3:layoutlib-api-26.1.3.jar:10bc73ce706c45629872d6a999dbe12116df64e24f47ff93b7b13121ff57b4b0',
+			'com.android.tools.lint:lint-api:26.1.3:lint-api-26.1.3.jar:6f97323f9af8deda86278717885b5c927f3766757db89709f52d11d42b6fb751',
+			'com.android.tools.lint:lint-checks:26.1.3:lint-checks-26.1.3.jar:73c3d53784c9ce3e6d5968506581918e0179645d20809927ca4a001dd766b001',
+			'com.android.tools.lint:lint-gradle-api:26.1.3:lint-gradle-api-26.1.3.jar:7ca3c4866ec21dc21d53a9d86f752b77ace6f6c610a0c9dc877313856c733d9d',
+			'com.android.tools.lint:lint-gradle:26.1.3:lint-gradle-26.1.3.jar:db0c354b8f4b6f6637e31f91c564785a59ff896325331fcbc3de7458e0b6c067',
+			'com.android.tools.lint:lint-kotlin:26.1.3:lint-kotlin-26.1.3.jar:94e2b0f4565a241561cfb8fc1222bb3f132a3b98d2a90421dbb72ee8358e7d68',
+			'com.android.tools.lint:lint:26.1.3:lint-26.1.3.jar:8d5f32c989c6d191d712e90ad3ca2d1c409313599551d04d834caa44d26c78df',
+			'com.android.tools:annotations:26.1.3:annotations-26.1.3.jar:c950430b24ac5d58fc97e7283b8f0115f99587e76e08b4e1e2aaa780f2d77323',
+			'com.android.tools:common:26.1.3:common-26.1.3.jar:7c31a90581a148ab219f615a59667f0dded7fa39b248529784474da3c2274ef2',
+			'com.android.tools:dvlib:26.1.3:dvlib-26.1.3.jar:0cae87906f53d3f1088366a916ed180a7312b6d9919b90797f238875c8492855',
+			'com.android.tools:repository:26.1.3:repository-26.1.3.jar:52d4539cc68db91b261e2a33b2c8206b26e05539078758dc28cfb3854adb4f59',
+			'com.android.tools:sdk-common:26.1.3:sdk-common-26.1.3.jar:1948603ca9ff22c7ebb3178000bffa3a9dd2ca1cc5cb0c793cae08468b8fcfc1',
+			'com.android.tools:sdklib:26.1.3:sdklib-26.1.3.jar:4adcfaad9514607098d2c51503c39811112d3050f4d1e744c01c7f08f591032b',
+			'com.google.code.findbugs:jsr305:1.3.9:jsr305-1.3.9.jar:905721a0eea90a81534abb7ee6ef4ea2e5e645fa1def0a5cd88402df1b46c9ed',
+			'com.google.code.gson:gson:2.7:gson-2.7.jar:2d43eb5ea9e133d2ee2405cc14f5ee08951b8361302fdd93494a3a997b508d32',
+			'com.google.dagger:dagger-compiler:2.0.2:dagger-compiler-2.0.2.jar:b74bc9de063dd4c6400b232231f2ef5056145b8fbecbf5382012007dd1c071b3',
+			'com.google.dagger:dagger-producers:2.0-beta:dagger-producers-2.0-beta.jar:99ec15e8a0507ba569e7655bc1165ee5e5ca5aa914b3c8f7e2c2458f724edd6b',
+			'com.google.dagger:dagger:2.0.2:dagger-2.0.2.jar:84c0282ed8be73a29e0475d639da030b55dee72369e58dd35ae7d4fe6243dcf9',
+			'com.google.errorprone:error_prone_annotations:2.0.18:error_prone_annotations-2.0.18.jar:cb4cfad870bf563a07199f3ebea5763f0dec440fcda0b318640b1feaa788656b',
+			'com.google.guava:guava:18.0:guava-18.0.jar:d664fbfc03d2e5ce9cab2a44fb01f1d0bf9dfebeccc1a473b1f9ea31f79f6f99',
+			'com.google.guava:guava:22.0:guava-22.0.jar:1158e94c7de4da480873f0b4ab4a1da14c0d23d4b1902cc94a58a6f0f9ab579e',
+			'com.google.j2objc:j2objc-annotations:1.1:j2objc-annotations-1.1.jar:40ceb7157feb263949e0f503fe5f71689333a621021aa20ce0d0acee3badaa0f',
+			'com.google.jimfs:jimfs:1.1:jimfs-1.1.jar:c4828e28d7c0a930af9387510b3bada7daa5c04d7c25a75c7b8b081f1c257ddd',
+			'com.google.protobuf:protobuf-java:3.4.0:protobuf-java-3.4.0.jar:dce7e66b32456a1b1198da0caff3a8acb71548658391e798c79369241e6490a4',
+			'com.googlecode.json-simple:json-simple:1.1:json-simple-1.1.jar:2d9484f4c649f708f47f9a479465fc729770ee65617dca3011836602264f6439',
+			'com.squareup:javawriter:2.5.0:javawriter-2.5.0.jar:fcfb09fb0ea0aa97d3cfe7ea792398081348e468f126b3603cb3803f240197f0',
+			'com.sun.activation:javax.activation:1.2.0:javax.activation-1.2.0.jar:993302b16cd7056f21e779cc577d175a810bb4900ef73cd8fbf2b50f928ba9ce',
+			'com.sun.istack:istack-commons-runtime:2.21:istack-commons-runtime-2.21.jar:c33e67a0807095f02a0e2da139412dd7c4f9cc1a4c054b3e434f96831ba950f4',
+			'com.sun.xml.fastinfoset:FastInfoset:1.2.13:FastInfoset-1.2.13.jar:27a77db909f3c2833c0b1a37c55af1db06045118ad2eed96ce567b6632bce038',
+			'commons-codec:commons-codec:1.6:commons-codec-1.6.jar:54b34e941b8e1414bd3e40d736efd3481772dc26db3296f6aa45cec9f6203d86',
+			'commons-logging:commons-logging:1.1.1:commons-logging-1.1.1.jar:ce6f913cad1f0db3aad70186d65c5bc7ffcc9a99e3fe8e0b137312819f7c362f',
+			'it.unimi.dsi:fastutil:7.2.0:fastutil-7.2.0.jar:74fa208043740642f7e6eb09faba15965218ad2f50ce3020efb100136e4b591c',
+			'javax.annotation:jsr250-api:1.0:jsr250-api-1.0.jar:a1a922d0d9b6d183ed3800dfac01d1e1eb159f0e8c6f94736931c1def54a941f',
+			'javax.inject:javax.inject:1:javax.inject-1.jar:91c77044a50c481636c32d916fd89c9118a72195390452c81065080f957de7ff',
+			'javax.xml.bind:jaxb-api:2.2.12-b140109.1041:jaxb-api-2.2.12-b140109.1041.jar:b5e60cd8b7b5ff01ce4a74c5dd008f4fbd14ced3495d0b47b85cfedc182211f2',
+			'junit:junit:4.12:junit-4.12.jar:59721f0805e223d84b90677887d9ff567dc534d7c502ca903c0c2b17f05c116a',
+			'net.sf.jopt-simple:jopt-simple:4.9:jopt-simple-4.9.jar:26c5856e954b5f864db76f13b86919b59c6eecf9fd930b96baa8884626baf2f5',
+			'net.sf.kxml:kxml2:2.3.0:kxml2-2.3.0.jar:f264dd9f79a1fde10ce5ecc53221eff24be4c9331c830b7d52f2f08a7b633de2',
+			'org.apache.ant:ant-launcher:1.9.4:ant-launcher-1.9.4.jar:7bccea20b41801ca17bcbc909a78c835d0f443f12d639c77bd6ae3d05861608d',
+			'org.apache.ant:ant:1.9.4:ant-1.9.4.jar:649ae0730251de07b8913f49286d46bba7b92d47c5f332610aa426c4f02161d8',
+			'org.apache.commons:commons-compress:1.12:commons-compress-1.12.jar:2c1542faf343185b7cab9c3d55c8ae5471d6d095d3887a4adefdbdf2984dc0b6',
+			'org.apache.httpcomponents:httpclient:4.2.6:httpclient-4.2.6.jar:362e9324ee7c697e21279e20077b52737ddef3f1b2c1a7abe5ad34b465145550',
+			'org.apache.httpcomponents:httpcore:4.2.5:httpcore-4.2.5.jar:e5e82da4cc66c8d917bbf743e3c0752efe8522735e7fc9dbddb65bccea81cfe9',
+			'org.apache.httpcomponents:httpmime:4.1:httpmime-4.1.jar:31629566148e8a47688ae43b420abc3ecd783ed15b33bebc00824bf24c9b15aa',
+			'org.beanshell:bsh:1.3.0:bsh-1.3.0.jar:9b04edc75d19db54f1b4e8b5355e9364384c6cf71eb0a1b9724c159d779879f8',
+			'org.bouncycastle:bcpkix-jdk15on:1.56:bcpkix-jdk15on-1.56.jar:7043dee4e9e7175e93e0b36f45b1ec1ecb893c5f755667e8b916eb8dd201c6ca',
+			'org.bouncycastle:bcprov-jdk15on:1.56:bcprov-jdk15on-1.56.jar:963e1ee14f808ffb99897d848ddcdb28fa91ddda867eb18d303e82728f878349',
+			'org.briarproject:jtorctl:0.3:jtorctl-0.3.jar:f2939238a097898998432effe93b0334d97a787972ab3a91a8973a1d309fc864',
+			'org.briarproject:tor-android:0.2.9.16:tor-android-0.2.9.16.zip:515e33dda6a30853c885a2de2c79ae1ab9ad8b6db44f5db8890333ec2e24f4ae',
+			'org.codehaus.groovy:groovy-all:2.4.12:groovy-all-2.4.12.jar:6a56af4bd48903d56bec62821876cadefafd007360cc6bd0d8f7aa8d72b38be4',
+			'org.codehaus.mojo:animal-sniffer-annotations:1.14:animal-sniffer-annotations-1.14.jar:2068320bd6bad744c3673ab048f67e30bef8f518996fa380033556600669905d',
+			'org.glassfish.jaxb:jaxb-core:2.2.11:jaxb-core-2.2.11.jar:37bcaee8ebb04362c8352a5bf6221b86967ecdab5164c696b10b9a2bb587b2aa',
+			'org.glassfish.jaxb:jaxb-runtime:2.2.11:jaxb-runtime-2.2.11.jar:a874f2351cfba8e2946be3002d10c18a6da8f21b52ba2acf52f2b85d5520ed70',
+			'org.glassfish.jaxb:txw2:2.2.11:txw2-2.2.11.jar:272a3ccad45a4511351920cd2a8633c53cab8d5220c7a92954da5526bb5eafea',
+			'org.hamcrest:hamcrest-core:1.3:hamcrest-core-1.3.jar:66fdef91e9739348df7a096aa384a5685f4e875584cce89386a7a47251c4d8e9',
+			'org.hamcrest:hamcrest-library:1.3:hamcrest-library-1.3.jar:711d64522f9ec410983bd310934296da134be4254a125080a0416ec178dfad1c',
+			'org.jetbrains.kotlin:kotlin-reflect:1.2.0:kotlin-reflect-1.2.0.jar:4f48a872bad6e4d9c053f4ad610d11e4012ad7e58dc19a03dd5eb811f36069dd',
+			'org.jetbrains.kotlin:kotlin-stdlib-jre7:1.2.0:kotlin-stdlib-jre7-1.2.0.jar:c7a20fb951d437797afe8980aff6c1e5a03f310c661ba58ba1d4fa90cb0f2926',
+			'org.jetbrains.kotlin:kotlin-stdlib-jre8:1.2.0:kotlin-stdlib-jre8-1.2.0.jar:633524eee6ef1941f7cb1dab7ee3927b0a221ceee9047aeb5515f4cbb990c82a',
+			'org.jetbrains.kotlin:kotlin-stdlib:1.2.0:kotlin-stdlib-1.2.0.jar:05cfd9f5ac0b41910703a8925f7211a495909b27a2ffdd1c5106f1689aeafcd4',
+			'org.jetbrains.trove4j:trove4j:20160824:trove4j-20160824.jar:1917871c8deb468307a584680c87a44572f5a8b0b98c6d397fc0f5f86596dbe7',
+			'org.jetbrains:annotations:13.0:annotations-13.0.jar:ace2a10dc8e2d5fd34925ecac03e4988b2c0f851650c94b8cef49ba1bd111478',
+			'org.jmock:jmock-junit4:2.8.2:jmock-junit4-2.8.2.jar:f7ee4df4f7bd7b7f1cafad3b99eb74d579f109d5992ff625347352edb55e674c',
+			'org.jmock:jmock-legacy:2.8.2:jmock-legacy-2.8.2.jar:f2b985a5c08a9edb7f37612330c058809da3f6a6d63ce792426ebf8ff0d6d31b',
+			'org.jmock:jmock-testjar:2.8.2:jmock-testjar-2.8.2.jar:8900860f72c474e027cf97fe78dcbf154a1aa7fc62b6845c5fb4e4f3c7bc8760',
+			'org.jmock:jmock:2.8.2:jmock-2.8.2.jar:6c73cb4a2e6dbfb61fd99c9a768539c170ab6568e57846bd60dbf19596b65b16',
+			'org.jvnet.staxex:stax-ex:1.7.7:stax-ex-1.7.7.jar:a31ff7d77163c0deb09e7fee59ad35ae44c2cee2cc8552a116ccd1583d813fb4',
+			'org.objenesis:objenesis:2.1:objenesis-2.1.jar:c74330cc6b806c804fd37e74487b4fe5d7c2750c5e15fbc6efa13bdee1bdef80',
+			'org.ow2.asm:asm-analysis:5.1:asm-analysis-5.1.jar:a34658f5c5de4b573eef21131cc32cc25f7b66407944f312b28ec2e56abb1fa9',
+			'org.ow2.asm:asm-commons:5.1:asm-commons-5.1.jar:97b3786e1f55e74bddf8ad102bf50e33bbcbc1f6b7fd7b36f0bbbb25cd4981be',
+			'org.ow2.asm:asm-tree:5.1:asm-tree-5.1.jar:c0de2bbc4cb8297419659813ecd4ed1d077ed1dd5c1f5544cc5143e493e84c10',
+			'org.ow2.asm:asm-util:5.1:asm-util-5.1.jar:ee032c39ae5e3cd099148fbba9a2124f9ed613e5cb93e03ee0fa8808ce364040',
+			'org.ow2.asm:asm:5.0.4:asm-5.0.4.jar:896618ed8ae62702521a78bc7be42b7c491a08e6920a15f89a3ecdec31e9a220',
+			'org.ow2.asm:asm:5.1:asm-5.1.jar:d2da399a9967c69f0a21739256fa79d284222c223082cacadc17372244764b54',
+	]
+}
+
+project.afterEvaluate {
+	copy {
+		from configurations.tor.collect { zipTree(it) }
+		into 'src/main/res/raw'
+	}
+}

bramble-android/proguard-rules.txt

@@ -0,0 +1,19 @@
+-keep,includedescriptorclasses class org.briarproject.** { *; }
+
+-keep class org.h2.** { *; }
+-dontwarn org.h2.**
+-dontnote org.h2.**
+
+-keep class dagger.** { *; }
+-dontwarn dagger.**
+-dontnote dagger.**
+
+-keep class net.i2p.crypto.eddsa.** { *; }
+
+-keep class org.whispersystems.curve25519.** { *; }
+
+-dontwarn sun.misc.Unsafe
+-dontnote com.google.common.**
+
+# UPnP library isn't used
+-dontwarn org.bitlet.weupnp.**

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

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

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

@@ -0,0 +1,54 @@
+package org.briarproject.bramble.plugin.tor;
+
+import org.briarproject.bramble.api.contact.ContactId;
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.api.plugin.duplex.DuplexPluginCallback;
+import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
+import org.briarproject.bramble.api.properties.TransportProperties;
+import org.briarproject.bramble.api.settings.Settings;
+
+@NotNullByDefault
+public class TorPluginCallBack implements DuplexPluginCallback {
+
+	@Override
+	public void incomingConnectionCreated(DuplexTransportConnection d) {
+
+	}
+
+	@Override
+	public void outgoingConnectionCreated(ContactId c,
+			DuplexTransportConnection d) {
+
+	}
+
+	@Override
+	public Settings getSettings() {
+		return new Settings();
+	}
+
+	@Override
+	public TransportProperties getLocalProperties() {
+		return new TransportProperties();
+	}
+
+	@Override
+	public void mergeSettings(Settings s) {
+
+	}
+
+	@Override
+	public void mergeLocalProperties(TransportProperties p) {
+
+	}
+
+	@Override
+	public void transportEnabled() {
+
+	}
+
+	@Override
+	public void transportDisabled() {
+
+	}
+
+}

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

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

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

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

bramble-android/src/main/AndroidManifest.xml

@@ -0,0 +1,21 @@
+<manifest
+	package="org.briarproject.bramble"
+	xmlns:android="http://schemas.android.com/apk/res/android">
+
+	<uses-feature android:name="android.hardware.bluetooth" android:required="false"/>
+
+	<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
+	<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
+	<uses-permission android:name="android.permission.BLUETOOTH"/>
+	<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
+	<uses-permission android:name="android.permission.INTERNET"/>
+	<uses-permission android:name="android.permission.WAKE_LOCK"/>
+
+	<application
+		android:allowBackup="false"
+		android:label="@string/app_name"
+		android:supportsRtl="true">
+
+	</application>
+
+</manifest>

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

@@ -0,0 +1,27 @@
+package org.briarproject.bramble;
+
+import android.app.Application;
+
+import org.briarproject.bramble.network.AndroidNetworkModule;
+import org.briarproject.bramble.plugin.tor.CircumventionProvider;
+import org.briarproject.bramble.plugin.tor.CircumventionProviderImpl;
+import org.briarproject.bramble.system.AndroidSystemModule;
+
+import javax.inject.Singleton;
+
+import dagger.Module;
+import dagger.Provides;
+
+@Module(includes = {
+		AndroidNetworkModule.class,
+		AndroidSystemModule.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/api/system/AndroidExecutor.java

@@ -0,0 +1,33 @@
+package org.briarproject.bramble.api.system;
+
+import java.util.concurrent.Callable;
+import java.util.concurrent.Future;
+
+/**
+ * Enables background threads to make Android API calls that must be made from
+ * a thread with a message queue.
+ */
+public interface AndroidExecutor {
+
+	/**
+	 * Runs the given task on a background thread with a message queue and
+	 * returns a Future for getting the result.
+	 */
+	<V> Future<V> runOnBackgroundThread(Callable<V> c);
+
+	/**
+	 * Runs the given task on a background thread with a message queue.
+	 */
+	void runOnBackgroundThread(Runnable r);
+
+	/**
+	 * Runs the given task on the main UI thread and returns a Future for
+	 * getting the result.
+	 */
+	<V> Future<V> runOnUiThread(Callable<V> c);
+
+	/**
+	 * Runs the given task on the main UI thread.
+	 */
+	void runOnUiThread(Runnable r);
+}

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);
+		assert cm != null;
+		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/bluetooth/AndroidBluetoothPlugin.java

@@ -0,0 +1,210 @@
+package org.briarproject.bramble.plugin.bluetooth;
+
+import android.bluetooth.BluetoothAdapter;
+import android.bluetooth.BluetoothDevice;
+import android.bluetooth.BluetoothServerSocket;
+import android.bluetooth.BluetoothSocket;
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+
+import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
+import org.briarproject.bramble.api.plugin.Backoff;
+import org.briarproject.bramble.api.plugin.PluginException;
+import org.briarproject.bramble.api.plugin.duplex.DuplexPluginCallback;
+import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
+import org.briarproject.bramble.api.system.AndroidExecutor;
+import org.briarproject.bramble.util.AndroidUtils;
+
+import java.io.Closeable;
+import java.io.IOException;
+import java.security.SecureRandom;
+import java.util.UUID;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.Executor;
+import java.util.logging.Logger;
+
+import javax.annotation.Nullable;
+
+import static android.bluetooth.BluetoothAdapter.ACTION_SCAN_MODE_CHANGED;
+import static android.bluetooth.BluetoothAdapter.ACTION_STATE_CHANGED;
+import static android.bluetooth.BluetoothAdapter.EXTRA_SCAN_MODE;
+import static android.bluetooth.BluetoothAdapter.EXTRA_STATE;
+import static android.bluetooth.BluetoothAdapter.SCAN_MODE_CONNECTABLE;
+import static android.bluetooth.BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE;
+import static android.bluetooth.BluetoothAdapter.SCAN_MODE_NONE;
+import static android.bluetooth.BluetoothAdapter.STATE_OFF;
+import static android.bluetooth.BluetoothAdapter.STATE_ON;
+import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
+
+@MethodsNotNullByDefault
+@ParametersNotNullByDefault
+class AndroidBluetoothPlugin extends BluetoothPlugin<BluetoothServerSocket> {
+
+	private static final Logger LOG =
+			Logger.getLogger(AndroidBluetoothPlugin.class.getName());
+
+	private final AndroidExecutor androidExecutor;
+	private final Context appContext;
+
+	private volatile boolean wasEnabledByUs = false;
+	private volatile BluetoothStateReceiver receiver = null;
+
+	// Non-null if the plugin started successfully
+	private volatile BluetoothAdapter adapter = null;
+
+	AndroidBluetoothPlugin(BluetoothConnectionLimiter connectionLimiter,
+			Executor ioExecutor, AndroidExecutor androidExecutor,
+			Context appContext, SecureRandom secureRandom, Backoff backoff,
+			DuplexPluginCallback callback, int maxLatency) {
+		super(connectionLimiter, ioExecutor, secureRandom, backoff, callback,
+				maxLatency);
+		this.androidExecutor = androidExecutor;
+		this.appContext = appContext;
+	}
+
+	@Override
+	public void start() throws PluginException {
+		super.start();
+		// Listen for changes to the Bluetooth state
+		IntentFilter filter = new IntentFilter();
+		filter.addAction(ACTION_STATE_CHANGED);
+		filter.addAction(ACTION_SCAN_MODE_CHANGED);
+		receiver = new BluetoothStateReceiver();
+		appContext.registerReceiver(receiver, filter);
+	}
+
+	@Override
+	public void stop() {
+		super.stop();
+		if (receiver != null) appContext.unregisterReceiver(receiver);
+	}
+
+	@Override
+	void initialiseAdapter() throws IOException {
+		// BluetoothAdapter.getDefaultAdapter() must be called on a thread
+		// with a message queue, so submit it to the AndroidExecutor
+		try {
+			adapter = androidExecutor.runOnBackgroundThread(
+					BluetoothAdapter::getDefaultAdapter).get();
+		} catch (InterruptedException | ExecutionException e) {
+			throw new IOException(e);
+		}
+		if (adapter == null)
+			throw new IOException("Bluetooth is not supported");
+	}
+
+	@Override
+	boolean isAdapterEnabled() {
+		return adapter != null && adapter.isEnabled();
+	}
+
+	@Override
+	void enableAdapter() {
+		if (adapter != null && !adapter.isEnabled()) {
+			if (adapter.enable()) {
+				LOG.info("Enabling Bluetooth");
+				wasEnabledByUs = true;
+			} else {
+				LOG.info("Could not enable Bluetooth");
+			}
+		}
+	}
+
+	@Override
+	void disableAdapterIfEnabledByUs() {
+		if (isAdapterEnabled() && wasEnabledByUs) {
+			if (adapter.disable()) LOG.info("Disabling Bluetooth");
+			else LOG.info("Could not disable Bluetooth");
+			wasEnabledByUs = false;
+		}
+	}
+
+	@Override
+	void setEnabledByUs() {
+		wasEnabledByUs = true;
+	}
+
+	@Override
+	@Nullable
+	String getBluetoothAddress() {
+		String address = AndroidUtils.getBluetoothAddress(appContext, adapter);
+		return address.isEmpty() ? null : address;
+	}
+
+	@Override
+	BluetoothServerSocket openServerSocket(String uuid) throws IOException {
+		return adapter.listenUsingInsecureRfcommWithServiceRecord(
+				"RFCOMM", UUID.fromString(uuid));
+	}
+
+	@Override
+	void tryToClose(@Nullable BluetoothServerSocket ss) {
+		try {
+			if (ss != null) ss.close();
+		} catch (IOException e) {
+			logException(LOG, WARNING, e);
+		}
+	}
+
+	@Override
+	DuplexTransportConnection acceptConnection(BluetoothServerSocket ss)
+			throws IOException {
+		return wrapSocket(ss.accept());
+	}
+
+	private DuplexTransportConnection wrapSocket(BluetoothSocket s) {
+		return new AndroidBluetoothTransportConnection(this,
+				connectionLimiter, s);
+	}
+
+	@Override
+	boolean isValidAddress(String address) {
+		return BluetoothAdapter.checkBluetoothAddress(address);
+	}
+
+	@Override
+	DuplexTransportConnection connectTo(String address, String uuid)
+			throws IOException {
+		BluetoothDevice d = adapter.getRemoteDevice(address);
+		UUID u = UUID.fromString(uuid);
+		BluetoothSocket s = null;
+		try {
+			s = d.createInsecureRfcommSocketToServiceRecord(u);
+			s.connect();
+			return wrapSocket(s);
+		} catch (IOException e) {
+			tryToClose(s);
+			throw e;
+		}
+	}
+
+	private void tryToClose(@Nullable Closeable c) {
+		try {
+			if (c != null) c.close();
+		} catch (IOException e) {
+			logException(LOG, WARNING, e);
+		}
+	}
+
+	private class BluetoothStateReceiver extends BroadcastReceiver {
+
+		@Override
+		public void onReceive(Context ctx, Intent intent) {
+			int state = intent.getIntExtra(EXTRA_STATE, 0);
+			if (state == STATE_ON) onAdapterEnabled();
+			else if (state == STATE_OFF) onAdapterDisabled();
+			int scanMode = intent.getIntExtra(EXTRA_SCAN_MODE, 0);
+			if (scanMode == SCAN_MODE_NONE) {
+				LOG.info("Scan mode: None");
+			} else if (scanMode == SCAN_MODE_CONNECTABLE) {
+				LOG.info("Scan mode: Connectable");
+			} else if (scanMode == SCAN_MODE_CONNECTABLE_DISCOVERABLE) {
+				LOG.info("Scan mode: Discoverable");
+			}
+		}
+	}
+}

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

@@ -0,0 +1,72 @@
+package org.briarproject.bramble.plugin.bluetooth;
+
+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;
+import org.briarproject.bramble.api.plugin.TransportId;
+import org.briarproject.bramble.api.plugin.duplex.DuplexPlugin;
+import org.briarproject.bramble.api.plugin.duplex.DuplexPluginCallback;
+import org.briarproject.bramble.api.plugin.duplex.DuplexPluginFactory;
+import org.briarproject.bramble.api.system.AndroidExecutor;
+
+import java.security.SecureRandom;
+import java.util.concurrent.Executor;
+
+import javax.annotation.concurrent.Immutable;
+
+import static org.briarproject.bramble.api.plugin.BluetoothConstants.ID;
+
+@Immutable
+@NotNullByDefault
+public class AndroidBluetoothPluginFactory implements DuplexPluginFactory {
+
+	private static final int MAX_LATENCY = 30 * 1000; // 30 seconds
+	private static final int MIN_POLLING_INTERVAL = 60 * 1000; // 1 minute
+	private static final int MAX_POLLING_INTERVAL = 10 * 60 * 1000; // 10 mins
+	private static final double BACKOFF_BASE = 1.2;
+
+	private final Executor ioExecutor;
+	private final AndroidExecutor androidExecutor;
+	private final Context appContext;
+	private final SecureRandom secureRandom;
+	private final EventBus eventBus;
+	private final BackoffFactory backoffFactory;
+
+	public AndroidBluetoothPluginFactory(Executor ioExecutor,
+			AndroidExecutor androidExecutor, Context appContext,
+			SecureRandom secureRandom, EventBus eventBus,
+			BackoffFactory backoffFactory) {
+		this.ioExecutor = ioExecutor;
+		this.androidExecutor = androidExecutor;
+		this.appContext = appContext;
+		this.secureRandom = secureRandom;
+		this.eventBus = eventBus;
+		this.backoffFactory = backoffFactory;
+	}
+
+	@Override
+	public TransportId getId() {
+		return ID;
+	}
+
+	@Override
+	public int getMaxLatency() {
+		return MAX_LATENCY;
+	}
+
+	@Override
+	public DuplexPlugin createPlugin(DuplexPluginCallback callback) {
+		BluetoothConnectionLimiter connectionLimiter =
+				new BluetoothConnectionLimiterImpl();
+		Backoff backoff = backoffFactory.createBackoff(MIN_POLLING_INTERVAL,
+				MAX_POLLING_INTERVAL, BACKOFF_BASE);
+		AndroidBluetoothPlugin plugin = new AndroidBluetoothPlugin(
+				connectionLimiter, ioExecutor, androidExecutor, appContext,
+				secureRandom, backoff, callback, MAX_LATENCY);
+		eventBus.addListener(plugin);
+		return plugin;
+	}
+}

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

@@ -0,0 +1,46 @@
+package org.briarproject.bramble.plugin.bluetooth;
+
+import android.bluetooth.BluetoothSocket;
+
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.api.plugin.Plugin;
+import org.briarproject.bramble.api.plugin.duplex.AbstractDuplexTransportConnection;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+@NotNullByDefault
+class AndroidBluetoothTransportConnection
+		extends AbstractDuplexTransportConnection {
+
+	private final BluetoothConnectionLimiter connectionManager;
+	private final BluetoothSocket socket;
+
+	AndroidBluetoothTransportConnection(Plugin plugin,
+			BluetoothConnectionLimiter connectionManager,
+			BluetoothSocket socket) {
+		super(plugin);
+		this.connectionManager = connectionManager;
+		this.socket = socket;
+	}
+
+	@Override
+	protected InputStream getInputStream() throws IOException {
+		return socket.getInputStream();
+	}
+
+	@Override
+	protected OutputStream getOutputStream() throws IOException {
+		return socket.getOutputStream();
+	}
+
+	@Override
+	protected void closeConnection(boolean exception) throws IOException {
+		try {
+			socket.close();
+		} finally {
+			connectionManager.connectionClosed(this);
+		}
+	}
+}

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

@@ -0,0 +1,166 @@
+package org.briarproject.bramble.plugin.tcp;
+
+import android.content.Context;
+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;
+
+import java.io.IOException;
+import java.net.InetAddress;
+import java.net.Socket;
+import java.net.UnknownHostException;
+import java.util.Collection;
+import java.util.concurrent.Executor;
+import java.util.logging.Logger;
+
+import javax.annotation.Nullable;
+import javax.net.SocketFactory;
+
+import static android.content.Context.CONNECTIVITY_SERVICE;
+import static android.content.Context.WIFI_SERVICE;
+import static android.net.ConnectivityManager.TYPE_WIFI;
+import static android.os.Build.VERSION.SDK_INT;
+import static java.util.Collections.emptyList;
+import static java.util.Collections.singletonList;
+
+@NotNullByDefault
+class AndroidLanTcpPlugin extends LanTcpPlugin implements EventListener {
+
+	private static final byte[] WIFI_AP_ADDRESS_BYTES =
+			{(byte) 192, (byte) 168, 43, 1};
+	private static final InetAddress WIFI_AP_ADDRESS;
+
+	private static final Logger LOG =
+			Logger.getLogger(AndroidLanTcpPlugin.class.getName());
+
+	static {
+		try {
+			WIFI_AP_ADDRESS = InetAddress.getByAddress(WIFI_AP_ADDRESS_BYTES);
+		} catch (UnknownHostException e) {
+			// Should only be thrown if the address has an illegal length
+			throw new AssertionError(e);
+		}
+	}
+
+	private final Executor connectionStatusExecutor;
+	private final ConnectivityManager connectivityManager;
+	@Nullable
+	private final WifiManager wifiManager;
+
+	private volatile SocketFactory socketFactory;
+
+	AndroidLanTcpPlugin(Executor ioExecutor, Context appContext,
+			Backoff backoff, DuplexPluginCallback callback, int maxLatency,
+			int maxIdleTime) {
+		super(ioExecutor, backoff, callback, maxLatency, maxIdleTime);
+		// 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);
+		assert connectivityManager != null;
+		this.connectivityManager = connectivityManager;
+		wifiManager = (WifiManager) appContext.getApplicationContext()
+				.getSystemService(WIFI_SERVICE);
+		socketFactory = SocketFactory.getDefault();
+	}
+
+	@Override
+	public void start() {
+		if (used.getAndSet(true)) throw new IllegalStateException();
+		running = true;
+		updateConnectionStatus();
+	}
+
+	@Override
+	public void stop() {
+		running = false;
+		tryToClose(socket);
+	}
+
+	@Override
+	protected Socket createSocket() throws IOException {
+		return socketFactory.createSocket();
+	}
+
+	@Override
+	protected Collection<InetAddress> getLocalIpAddresses() {
+		// If the device doesn't have wifi, don't open any sockets
+		if (wifiManager == null) return emptyList();
+		// If we're connected to a wifi network, use that network
+		WifiInfo info = wifiManager.getConnectionInfo();
+		if (info != null && info.getIpAddress() != 0)
+			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);
+		// No suitable addresses
+		return emptyList();
+	}
+
+	private InetAddress intToInetAddress(int ip) {
+		byte[] ipBytes = new byte[4];
+		ipBytes[0] = (byte) (ip & 0xFF);
+		ipBytes[1] = (byte) ((ip >> 8) & 0xFF);
+		ipBytes[2] = (byte) ((ip >> 16) & 0xFF);
+		ipBytes[3] = (byte) ((ip >> 24) & 0xFF);
+		try {
+			return InetAddress.getByAddress(ipBytes);
+		} catch (UnknownHostException e) {
+			// Should only be thrown if address has illegal length
+			throw new AssertionError(e);
+		}
+	}
+
+	// On API 21 and later, a socket that is not created with the wifi
+	// network's socket factory may try to connect via another network
+	private SocketFactory getSocketFactory() {
+		if (SDK_INT < 21) return SocketFactory.getDefault();
+		for (Network net : connectivityManager.getAllNetworks()) {
+			NetworkInfo info = connectivityManager.getNetworkInfo(net);
+			if (info != null && info.getType() == TYPE_WIFI)
+				return net.getSocketFactory();
+		}
+		LOG.warning("Could not find suitable socket factory");
+		return SocketFactory.getDefault();
+	}
+
+	@Override
+	public void eventOccurred(Event e) {
+		if (e instanceof NetworkStatusEvent) updateConnectionStatus();
+	}
+
+	private void updateConnectionStatus() {
+		connectionStatusExecutor.execute(() -> {
+			if (!running) return;
+			Collection<InetAddress> addrs = getLocalIpAddresses();
+			if (addrs.contains(WIFI_AP_ADDRESS)) {
+				LOG.info("Providing wifi hotspot");
+				// There's no corresponding Network object and thus no way
+				// to get a suitable socket factory, so we won't be able to
+				// make outgoing connections on API 21+ if another network
+				// has internet access
+				socketFactory = SocketFactory.getDefault();
+				if (socket == null || socket.isClosed()) bind();
+			} else if (addrs.isEmpty()) {
+				LOG.info("Not connected to wifi");
+				socketFactory = SocketFactory.getDefault();
+				tryToClose(socket);
+			} else {
+				LOG.info("Connected to wifi");
+				socketFactory = getSocketFactory();
+				if (socket == null || socket.isClosed()) bind();
+			}
+		});
+	}
+}

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

@@ -0,0 +1,62 @@
+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;
+import org.briarproject.bramble.api.plugin.TransportId;
+import org.briarproject.bramble.api.plugin.duplex.DuplexPlugin;
+import org.briarproject.bramble.api.plugin.duplex.DuplexPluginCallback;
+import org.briarproject.bramble.api.plugin.duplex.DuplexPluginFactory;
+
+import java.util.concurrent.Executor;
+
+import javax.annotation.concurrent.Immutable;
+
+import static org.briarproject.bramble.api.plugin.LanTcpConstants.ID;
+
+@Immutable
+@NotNullByDefault
+public class AndroidLanTcpPluginFactory implements DuplexPluginFactory {
+
+	private static final int MAX_LATENCY = 30 * 1000; // 30 seconds
+	private static final int MAX_IDLE_TIME = 30 * 1000; // 30 seconds
+	private static final int MIN_POLLING_INTERVAL = 60 * 1000; // 1 minute
+	private static final int MAX_POLLING_INTERVAL = 10 * 60 * 1000; // 10 mins
+	private static final double BACKOFF_BASE = 1.2;
+
+	private final Executor ioExecutor;
+	private final EventBus eventBus;
+	private final BackoffFactory backoffFactory;
+	private final Context appContext;
+
+	public AndroidLanTcpPluginFactory(Executor ioExecutor, EventBus eventBus,
+			BackoffFactory backoffFactory, Context appContext) {
+		this.ioExecutor = ioExecutor;
+		this.eventBus = eventBus;
+		this.backoffFactory = backoffFactory;
+		this.appContext = appContext;
+	}
+
+	@Override
+	public TransportId getId() {
+		return ID;
+	}
+
+	@Override
+	public int getMaxLatency() {
+		return MAX_LATENCY;
+	}
+
+	@Override
+	public DuplexPlugin createPlugin(DuplexPluginCallback callback) {
+		Backoff backoff = backoffFactory.createBackoff(MIN_POLLING_INTERVAL,
+				MAX_POLLING_INTERVAL, BACKOFF_BASE);
+		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/CircumventionProvider.java

@@ -0,0 +1,32 @@
+package org.briarproject.bramble.plugin.tor;
+
+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 {
+
+	/**
+	 * Countries where Tor is blocked, i.e. vanilla Tor connection won't work.
+	 *
+	 * See https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2
+	 * and https://trac.torproject.org/projects/tor/wiki/doc/OONI/censorshipwiki
+	 */
+	String[] BLOCKED = {"CN", "IR", "EG", "BY", "TR", "SY", "VE"};
+
+	/**
+	 * Countries where vanilla bridge connection are likely to work.
+	 * Should be a subset of {@link #BLOCKED}.
+	 */
+	String[] BRIDGES = { "EG", "BY", "TR", "SY", "VE" };
+
+	boolean isTorProbablyBlocked(String countryCode);
+
+	boolean doBridgesWork(String countryCode);
+
+	@IoExecutor
+	List<String> getBridges();
+
+}

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

@@ -0,0 +1,70 @@
+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;
+import java.util.Set;
+
+import javax.annotation.Nullable;
+import javax.inject.Inject;
+
+// TODO: Create a module for this so it doesn't need to be public
+
+public class CircumventionProviderImpl implements CircumventionProvider {
+
+	private final static String BRIDGE_FILE_NAME = "bridges";
+
+	private final Context ctx;
+	@Nullable
+	private volatile List<String> bridges = null;
+
+	@Inject
+	public CircumventionProviderImpl(Context ctx) {
+		this.ctx = ctx;
+	}
+
+	private static final Set<String> BLOCKED_IN_COUNTRIES =
+			new HashSet<>(Arrays.asList(BLOCKED));
+	private static final Set<String> BRIDGES_WORK_IN_COUNTRIES =
+			new HashSet<>(Arrays.asList(BRIDGES));
+
+	@Override
+	public boolean isTorProbablyBlocked(String countryCode) {
+		return BLOCKED_IN_COUNTRIES.contains(countryCode);
+	}
+
+	@Override
+	public boolean doBridgesWork(String countryCode) {
+		return BRIDGES_WORK_IN_COUNTRIES.contains(countryCode);
+	}
+
+	@Override
+	@IoExecutor
+	public List<String> getBridges() {
+		if (this.bridges != null) return this.bridges;
+
+		Resources res = ctx.getResources();
+		int resId = res.getIdentifier(BRIDGE_FILE_NAME, "raw",
+				ctx.getPackageName());
+		InputStream is = ctx.getResources().openRawResource(resId);
+		Scanner scanner = new Scanner(is);
+
+		List<String> bridges = new ArrayList<>();
+		while (scanner.hasNextLine()) {
+			String line = scanner.nextLine();
+			if (!line.startsWith("#")) bridges.add(line);
+		}
+		scanner.close();
+		this.bridges = bridges;
+		return bridges;
+	}
+
+}

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

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

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

@@ -0,0 +1,109 @@
+package org.briarproject.bramble.plugin.tor;
+
+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;
+import org.briarproject.bramble.api.plugin.TorConstants;
+import org.briarproject.bramble.api.plugin.TransportId;
+import org.briarproject.bramble.api.plugin.duplex.DuplexPlugin;
+import org.briarproject.bramble.api.plugin.duplex.DuplexPluginCallback;
+import org.briarproject.bramble.api.plugin.duplex.DuplexPluginFactory;
+import org.briarproject.bramble.api.system.Clock;
+import org.briarproject.bramble.api.system.LocationUtils;
+import org.briarproject.bramble.util.AndroidUtils;
+
+import java.util.concurrent.Executor;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.logging.Logger;
+
+import javax.annotation.concurrent.Immutable;
+import javax.net.SocketFactory;
+
+@Immutable
+@NotNullByDefault
+public class TorPluginFactory implements DuplexPluginFactory {
+
+	private static final Logger LOG =
+			Logger.getLogger(TorPluginFactory.class.getName());
+
+	private static final int MAX_LATENCY = 30 * 1000; // 30 seconds
+	private static final int MAX_IDLE_TIME = 30 * 1000; // 30 seconds
+	private static final int MIN_POLLING_INTERVAL = 60 * 1000; // 1 minute
+	private static final int MAX_POLLING_INTERVAL = 10 * 60 * 1000; // 10 mins
+	private static final double BACKOFF_BASE = 1.2;
+
+	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 CircumventionProvider circumventionProvider;
+	private final Clock clock;
+
+	public TorPluginFactory(Executor ioExecutor,
+			ScheduledExecutorService scheduler, Context appContext,
+			NetworkManager networkManager, LocationUtils locationUtils,
+			EventBus eventBus, SocketFactory torSocketFactory,
+			BackoffFactory backoffFactory,
+			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.circumventionProvider = circumventionProvider;
+		this.clock = clock;
+	}
+
+	@Override
+	public TransportId getId() {
+		return TorConstants.ID;
+	}
+
+	@Override
+	public int getMaxLatency() {
+		return MAX_LATENCY;
+	}
+
+	@Override
+	public DuplexPlugin createPlugin(DuplexPluginCallback callback) {
+
+		// Check that we have a Tor binary for this architecture
+		String architecture = null;
+		for (String abi : AndroidUtils.getSupportedArchitectures()) {
+			if (abi.startsWith("x86")) {
+				architecture = "x86";
+				break;
+			} else if (abi.startsWith("armeabi")) {
+				architecture = "arm";
+				break;
+			}
+		}
+		if (architecture == null) {
+			LOG.info("Tor is not supported on this architecture");
+			return null;
+		}
+		// Use position-independent executable for SDK >= 16
+		if (Build.VERSION.SDK_INT >= 16) architecture += "_pie";
+
+		Backoff backoff = backoffFactory.createBackoff(MIN_POLLING_INTERVAL,
+				MAX_POLLING_INTERVAL, BACKOFF_BASE);
+		TorPlugin plugin = new TorPlugin(ioExecutor, scheduler, appContext,
+				networkManager, locationUtils, torSocketFactory, clock,
+				circumventionProvider, backoff, callback, architecture,
+				MAX_LATENCY, MAX_IDLE_TIME);
+		eventBus.addListener(plugin);
+		return plugin;
+	}
+}

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

@@ -0,0 +1,37 @@
+package org.briarproject.bramble.plugin.tor;
+
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.api.plugin.Plugin;
+import org.briarproject.bramble.api.plugin.duplex.AbstractDuplexTransportConnection;
+import org.briarproject.bramble.util.IoUtils;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.Socket;
+
+@NotNullByDefault
+class TorTransportConnection extends AbstractDuplexTransportConnection {
+
+	private final Socket socket;
+
+	TorTransportConnection(Plugin plugin, Socket socket) {
+		super(plugin);
+		this.socket = socket;
+	}
+
+	@Override
+	protected InputStream getInputStream() throws IOException {
+		return IoUtils.getInputStream(socket);
+	}
+
+	@Override
+	protected OutputStream getOutputStream() throws IOException {
+		return IoUtils.getOutputStream(socket);
+	}
+
+	@Override
+	protected void closeConnection(boolean exception) throws IOException {
+		socket.close();
+	}
+}

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

@@ -0,0 +1,75 @@
+package org.briarproject.bramble.system;
+
+import android.app.Application;
+import android.os.Handler;
+import android.os.Looper;
+
+import org.briarproject.bramble.api.system.AndroidExecutor;
+
+import java.util.concurrent.Callable;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.Future;
+import java.util.concurrent.FutureTask;
+import java.util.concurrent.RejectedExecutionException;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+import javax.inject.Inject;
+
+class AndroidExecutorImpl implements AndroidExecutor {
+
+	private final Handler uiHandler;
+	private final Runnable loop;
+	private final AtomicBoolean started = new AtomicBoolean(false);
+	private final CountDownLatch startLatch = new CountDownLatch(1);
+
+	private volatile Handler backgroundHandler = null;
+
+	@Inject
+	AndroidExecutorImpl(Application app) {
+		uiHandler = new Handler(app.getApplicationContext().getMainLooper());
+		loop = () -> {
+			Looper.prepare();
+			backgroundHandler = new Handler();
+			startLatch.countDown();
+			Looper.loop();
+		};
+	}
+
+	private void startIfNecessary() {
+		if (!started.getAndSet(true)) {
+			Thread t = new Thread(loop, "AndroidExecutor");
+			t.setDaemon(true);
+			t.start();
+		}
+		try {
+			startLatch.await();
+		} catch (InterruptedException e) {
+			throw new RejectedExecutionException(e);
+		}
+	}
+
+	@Override
+	public <V> Future<V> runOnBackgroundThread(Callable<V> c) {
+		FutureTask<V> f = new FutureTask<>(c);
+		runOnBackgroundThread(f);
+		return f;
+	}
+
+	@Override
+	public void runOnBackgroundThread(Runnable r) {
+		startIfNecessary();
+		backgroundHandler.post(r);
+	}
+
+	@Override
+	public <V> Future<V> runOnUiThread(Callable<V> c) {
+		FutureTask<V> f = new FutureTask<>(c);
+		runOnUiThread(f);
+		return f;
+	}
+
+	@Override
+	public void runOnUiThread(Runnable r) {
+		uiHandler.post(r);
+	}
+}

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

@@ -1,4 +1,4 @@
-package org.briarproject.system;
+package org.briarproject.bramble.system;
 
 import android.annotation.SuppressLint;
 import android.app.Application;
@@ -6,7 +6,8 @@ import android.content.Context;
 import android.telephony.TelephonyManager;
 import android.text.TextUtils;
 
-import org.briarproject.api.system.LocationUtils;
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.api.system.LocationUtils;
 
 import java.util.Locale;
 import java.util.logging.Logger;
@@ -15,6 +16,7 @@ import javax.inject.Inject;
 
 import static android.content.Context.TELEPHONY_SERVICE;
 
+@NotNullByDefault
 class AndroidLocationUtils implements LocationUtils {
 
 	private static final Logger LOG =
@@ -23,7 +25,7 @@ class AndroidLocationUtils implements LocationUtils {
 	private final Context appContext;
 
 	@Inject
-	public AndroidLocationUtils(Application app) {
+	AndroidLocationUtils(Application app) {
 		appContext = app.getApplicationContext();
 	}
 
@@ -44,6 +46,7 @@ class AndroidLocationUtils implements LocationUtils {
 	 * some reason - both that class and {@code Context.COUNTRY_CODE} are
 	 * annotated {@code @hide}.
 	 */
+	@Override
 	@SuppressLint("DefaultLocale")
 	public String getCurrentCountry() {
 		String countryCode = getCountryFromPhoneNetwork();

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

@@ -0,0 +1,97 @@
+package org.briarproject.bramble.system;
+
+import android.app.Application;
+import android.bluetooth.BluetoothAdapter;
+import android.bluetooth.BluetoothDevice;
+import android.content.ContentResolver;
+import android.content.Context;
+import android.net.wifi.WifiConfiguration;
+import android.net.wifi.WifiManager;
+import android.os.Build;
+import android.os.Parcel;
+import android.os.StrictMode;
+import android.provider.Settings;
+
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.util.List;
+
+import javax.annotation.concurrent.Immutable;
+import javax.inject.Inject;
+
+import static android.content.Context.WIFI_SERVICE;
+import static android.provider.Settings.Secure.ANDROID_ID;
+
+@Immutable
+@NotNullByDefault
+class AndroidSecureRandomProvider extends LinuxSecureRandomProvider {
+
+	private static final int SEED_LENGTH = 32;
+
+	private final Context appContext;
+
+	@Inject
+	AndroidSecureRandomProvider(Application app) {
+		appContext = app.getApplicationContext();
+	}
+
+	@Override
+	protected void writeToEntropyPool(DataOutputStream out) throws IOException {
+		super.writeToEntropyPool(out);
+		out.writeInt(android.os.Process.myPid());
+		out.writeInt(android.os.Process.myTid());
+		out.writeInt(android.os.Process.myUid());
+		if (Build.FINGERPRINT != null) out.writeUTF(Build.FINGERPRINT);
+		if (Build.SERIAL != null) out.writeUTF(Build.SERIAL);
+		ContentResolver contentResolver = appContext.getContentResolver();
+		String id = Settings.Secure.getString(contentResolver, ANDROID_ID);
+		if (id != null) out.writeUTF(id);
+		Parcel parcel = Parcel.obtain();
+		WifiManager wm =
+				(WifiManager) appContext.getSystemService(WIFI_SERVICE);
+		List<WifiConfiguration> configs = wm.getConfiguredNetworks();
+		if (configs != null) {
+			for (WifiConfiguration config : configs)
+				parcel.writeParcelable(config, 0);
+		}
+		BluetoothAdapter bt = BluetoothAdapter.getDefaultAdapter();
+		if (bt != null) {
+			for (BluetoothDevice device : bt.getBondedDevices())
+				parcel.writeParcelable(device, 0);
+		}
+		out.write(parcel.marshall());
+		parcel.recycle();
+	}
+
+	@Override
+	protected void writeSeed() {
+		// Silence strict mode
+		StrictMode.ThreadPolicy tp = StrictMode.allowThreadDiskWrites();
+		super.writeSeed();
+		if (Build.VERSION.SDK_INT >= 16 && Build.VERSION.SDK_INT <= 18)
+			applyOpenSslFix();
+		StrictMode.setThreadPolicy(tp);
+	}
+
+	// Based on https://android-developers.googleblog.com/2013/08/some-securerandom-thoughts.html
+	private void applyOpenSslFix() {
+		byte[] seed = new LinuxSecureRandomSpi().engineGenerateSeed(
+				SEED_LENGTH);
+		try {
+			// Seed the OpenSSL PRNG
+			Class.forName("org.apache.harmony.xnet.provider.jsse.NativeCrypto")
+					.getMethod("RAND_seed", byte[].class)
+					.invoke(null, seed);
+			// Mix the output of the Linux PRNG into the OpenSSL PRNG
+			int bytesRead = (Integer) Class.forName(
+					"org.apache.harmony.xnet.provider.jsse.NativeCrypto")
+					.getMethod("RAND_load_file", String.class, long.class)
+					.invoke(null, "/dev/urandom", 1024);
+			if (bytesRead != 1024) throw new IOException();
+		} catch (Exception e) {
+			throw new SecurityException(e);
+		}
+	}
+}

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

@@ -0,0 +1,33 @@
+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.SecureRandomProvider;
+
+import javax.inject.Singleton;
+
+import dagger.Module;
+import dagger.Provides;
+
+@Module
+public class AndroidSystemModule {
+
+	@Provides
+	@Singleton
+	SecureRandomProvider provideSecureRandomProvider(Application app) {
+		return new AndroidSecureRandomProvider(app);
+	}
+
+	@Provides
+	LocationUtils provideLocationUtils(Application app) {
+		return new AndroidLocationUtils(app);
+	}
+
+	@Provides
+	@Singleton
+	AndroidExecutor provideAndroidExecutor(Application app) {
+		return new AndroidExecutorImpl(app);
+	}
+}

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

@@ -0,0 +1,63 @@
+package org.briarproject.bramble.util;
+
+import android.annotation.SuppressLint;
+import android.bluetooth.BluetoothAdapter;
+import android.content.Context;
+import android.os.Build;
+import android.provider.Settings;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.List;
+import java.util.logging.Logger;
+
+import static android.content.Context.MODE_PRIVATE;
+
+public class AndroidUtils {
+
+	private static final Logger LOG =
+			Logger.getLogger(AndroidUtils.class.getName());
+
+	// Fake Bluetooth address returned by BluetoothAdapter on API 23 and later
+	private static final String FAKE_BLUETOOTH_ADDRESS = "02:00:00:00:00:00";
+
+	private static final String STORED_REPORTS = "dev-reports";
+
+	@SuppressWarnings("deprecation")
+	public static Collection<String> getSupportedArchitectures() {
+		List<String> abis = new ArrayList<>();
+		if (Build.VERSION.SDK_INT >= 21) {
+			abis.addAll(Arrays.asList(Build.SUPPORTED_ABIS));
+		} else {
+			abis.add(Build.CPU_ABI);
+			if (Build.CPU_ABI2 != null) abis.add(Build.CPU_ABI2);
+		}
+		return abis;
+	}
+
+	public static String getBluetoothAddress(Context ctx,
+			BluetoothAdapter adapter) {
+		// Return the adapter's address if it's valid and not fake
+		@SuppressLint("HardwareIds")
+		String address = adapter.getAddress();
+		if (isValidBluetoothAddress(address)) return address;
+		// Return the address from settings if it's valid and not fake
+		address = Settings.Secure.getString(ctx.getContentResolver(),
+				"bluetooth_address");
+		if (isValidBluetoothAddress(address)) return address;
+		// Let the caller know we can't find the address
+		return "";
+	}
+
+	private static boolean isValidBluetoothAddress(String address) {
+		return !StringUtils.isNullOrEmpty(address)
+				&& BluetoothAdapter.checkBluetoothAddress(address)
+				&& !address.equals(FAKE_BLUETOOTH_ADDRESS);
+	}
+
+	public static File getReportDir(Context ctx) {
+		return ctx.getDir(STORED_REPORTS, MODE_PRIVATE);
+	}
+}

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

@@ -0,0 +1,100 @@
+package org.briarproject.bramble.util;
+
+import android.os.PowerManager;
+
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.ScheduledFuture;
+import java.util.concurrent.TimeUnit;
+import java.util.logging.Logger;
+
+import javax.annotation.Nullable;
+import javax.annotation.concurrent.ThreadSafe;
+
+import static java.util.concurrent.TimeUnit.MILLISECONDS;
+import static java.util.logging.Level.INFO;
+
+@ThreadSafe
+@NotNullByDefault
+public class RenewableWakeLock {
+
+	private static final Logger LOG =
+			Logger.getLogger(RenewableWakeLock.class.getName());
+
+	/**
+	 * Automatically release the lock this many milliseconds after it's due
+	 * to have been replaced and released.
+	 */
+	private static final int SAFETY_MARGIN_MS = 10_000;
+
+	private final PowerManager powerManager;
+	private final ScheduledExecutorService scheduler;
+	private final int levelAndFlags;
+	private final String tag;
+	private final long durationMs;
+	private final Runnable renewTask;
+
+	private final Object lock = new Object();
+	@Nullable
+	private PowerManager.WakeLock wakeLock; // Locking: lock
+	@Nullable
+	private ScheduledFuture future; // Locking: lock
+
+	public RenewableWakeLock(PowerManager powerManager,
+			ScheduledExecutorService scheduler, int levelAndFlags, String tag,
+			long duration, TimeUnit timeUnit) {
+		this.powerManager = powerManager;
+		this.scheduler = scheduler;
+		this.levelAndFlags = levelAndFlags;
+		this.tag = tag;
+		durationMs = MILLISECONDS.convert(duration, timeUnit);
+		renewTask = this::renew;
+	}
+
+	public void acquire() {
+		if (LOG.isLoggable(INFO)) LOG.info("Acquiring wake lock " + tag);
+		synchronized (lock) {
+			if (wakeLock != null) {
+				LOG.info("Already acquired");
+				return;
+			}
+			wakeLock = powerManager.newWakeLock(levelAndFlags, tag);
+			wakeLock.setReferenceCounted(false);
+			wakeLock.acquire(durationMs + SAFETY_MARGIN_MS);
+			future = scheduler.schedule(renewTask, durationMs, MILLISECONDS);
+		}
+	}
+
+	private void renew() {
+		if (LOG.isLoggable(INFO)) LOG.info("Renewing wake lock " + tag);
+		synchronized (lock) {
+			if (wakeLock == null) {
+				LOG.info("Already released");
+				return;
+			}
+			PowerManager.WakeLock oldWakeLock = wakeLock;
+			wakeLock = powerManager.newWakeLock(levelAndFlags, tag);
+			wakeLock.setReferenceCounted(false);
+			wakeLock.acquire(durationMs + SAFETY_MARGIN_MS);
+			oldWakeLock.release();
+			future = scheduler.schedule(renewTask, durationMs, MILLISECONDS);
+		}
+	}
+
+	public void release() {
+		if (LOG.isLoggable(INFO)) LOG.info("Releasing wake lock " + tag);
+		synchronized (lock) {
+			if (wakeLock == null) {
+				LOG.info("Already released");
+				return;
+			}
+			if (future == null) throw new AssertionError();
+			future.cancel(false);
+			future = null;
+			wakeLock.release();
+			wakeLock = null;
+		}
+	}
+}
+

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

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

bramble-android/src/main/res/values/strings.xml

@@ -0,0 +1,3 @@
+<resources>
+	<string name="app_name">Bramble</string>
+</resources>

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-api/build.gradle

@@ -0,0 +1,57 @@
+apply plugin: 'java-library'
+sourceCompatibility = 1.8
+targetCompatibility = 1.8
+
+apply plugin: 'ru.vyarus.animalsniffer'
+apply plugin: 'witness'
+
+dependencies {
+	implementation "com.google.dagger:dagger:2.0.2"
+	implementation 'com.google.code.findbugs:jsr305:3.0.2'
+
+	testImplementation 'junit:junit:4.12'
+	testImplementation "org.jmock:jmock:2.8.2"
+	testImplementation "org.jmock:jmock-junit4:2.8.2"
+	testImplementation "org.jmock:jmock-legacy:2.8.2"
+	testImplementation "org.hamcrest:hamcrest-library:1.3"
+	testImplementation "org.hamcrest:hamcrest-core:1.3"
+
+	signature 'org.codehaus.mojo.signature:java16:1.1@signature'
+}
+
+dependencyVerification {
+	verify = [
+			'cglib:cglib:3.2.0:cglib-3.2.0.jar:adb13bab79712ad6bdf1bd59f2a3918018a8016e722e8a357065afb9e6690861',
+			'com.google.code.findbugs:jsr305:3.0.2:jsr305-3.0.2.jar:766ad2a0783f2687962c8ad74ceecc38a28b9f72a2d085ee438b7813e928d0c7',
+			'com.google.dagger:dagger:2.0.2:dagger-2.0.2.jar:84c0282ed8be73a29e0475d639da030b55dee72369e58dd35ae7d4fe6243dcf9',
+			'javax.inject:javax.inject:1:javax.inject-1.jar:91c77044a50c481636c32d916fd89c9118a72195390452c81065080f957de7ff',
+			'junit:junit:4.12:junit-4.12.jar:59721f0805e223d84b90677887d9ff567dc534d7c502ca903c0c2b17f05c116a',
+			'org.apache.ant:ant-launcher:1.9.4:ant-launcher-1.9.4.jar:7bccea20b41801ca17bcbc909a78c835d0f443f12d639c77bd6ae3d05861608d',
+			'org.apache.ant:ant:1.9.4:ant-1.9.4.jar:649ae0730251de07b8913f49286d46bba7b92d47c5f332610aa426c4f02161d8',
+			'org.beanshell:bsh:1.3.0:bsh-1.3.0.jar:9b04edc75d19db54f1b4e8b5355e9364384c6cf71eb0a1b9724c159d779879f8',
+			'org.codehaus.mojo.signature:java16:1.1:java16-1.1.signature:53799223a2c98dba2d0add810bed76315460df285c69e4f397ae6098f87dd619',
+			'org.codehaus.mojo:animal-sniffer-ant-tasks:1.16:animal-sniffer-ant-tasks-1.16.jar:890040976fbe2d584619a6a61b1fd2e925b3b5eb342a85eb2762c467c0d64e90',
+			'org.codehaus.mojo:animal-sniffer:1.16:animal-sniffer-1.16.jar:72be8bcc226ba43b937c722a08a07852bfa1b11400089265d5df0ee7b38b1d52',
+			'org.hamcrest:hamcrest-core:1.3:hamcrest-core-1.3.jar:66fdef91e9739348df7a096aa384a5685f4e875584cce89386a7a47251c4d8e9',
+			'org.hamcrest:hamcrest-library:1.3:hamcrest-library-1.3.jar:711d64522f9ec410983bd310934296da134be4254a125080a0416ec178dfad1c',
+			'org.jmock:jmock-junit4:2.8.2:jmock-junit4-2.8.2.jar:f7ee4df4f7bd7b7f1cafad3b99eb74d579f109d5992ff625347352edb55e674c',
+			'org.jmock:jmock-legacy:2.8.2:jmock-legacy-2.8.2.jar:f2b985a5c08a9edb7f37612330c058809da3f6a6d63ce792426ebf8ff0d6d31b',
+			'org.jmock:jmock-testjar:2.8.2:jmock-testjar-2.8.2.jar:8900860f72c474e027cf97fe78dcbf154a1aa7fc62b6845c5fb4e4f3c7bc8760',
+			'org.jmock:jmock:2.8.2:jmock-2.8.2.jar:6c73cb4a2e6dbfb61fd99c9a768539c170ab6568e57846bd60dbf19596b65b16',
+			'org.objenesis:objenesis:2.1:objenesis-2.1.jar:c74330cc6b806c804fd37e74487b4fe5d7c2750c5e15fbc6efa13bdee1bdef80',
+			'org.ow2.asm:asm-all:5.2:asm-all-5.2.jar:7fbffbc1db3422e2101689fd88df8384b15817b52b9b2b267b9f6d2511dc198d',
+			'org.ow2.asm:asm:5.0.4:asm-5.0.4.jar:896618ed8ae62702521a78bc7be42b7c491a08e6920a15f89a3ecdec31e9a220',
+	]
+}
+
+// needed to make test output available to bramble-core and briar-core
+configurations {
+	testOutput.extendsFrom(testCompile)
+}
+task jarTest(type: Jar, dependsOn: testClasses) {
+	from sourceSets.test.output
+	classifier = 'test'
+}
+artifacts {
+	testOutput jarTest
+}

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

@@ -1,11 +1,18 @@
-package org.briarproject.api;
+package org.briarproject.bramble.api;
+
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.util.StringUtils;
 
 import java.util.Arrays;
 import java.util.Comparator;
 
+import javax.annotation.concurrent.ThreadSafe;
+
 /**
  * A wrapper around a byte array, to allow it to be stored in maps etc.
  */
+@ThreadSafe
+@NotNullByDefault
 public class Bytes implements Comparable<Bytes> {
 
 	public static final BytesComparator COMPARATOR = new BytesComparator();
@@ -47,6 +54,12 @@ public class Bytes implements Comparable<Bytes> {
 		return aBytes.length - bBytes.length;
 	}
 
+	@Override
+	public String toString() {
+		return getClass().getSimpleName() +
+				"(" + StringUtils.toHexString(getBytes()) + ")";
+	}
+
 	public static class BytesComparator implements Comparator<Bytes> {
 
 		@Override

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

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

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

@@ -0,0 +1,101 @@
+package org.briarproject.bramble.api;
+
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.NoSuchElementException;
+import java.util.Set;
+
+import javax.annotation.concurrent.NotThreadSafe;
+
+@NotThreadSafe
+@NotNullByDefault
+public class Multiset<T> {
+
+	private final Map<T, Integer> map = new HashMap<>();
+
+	private int total = 0;
+
+	/**
+	 * Returns how many items the multiset contains in total.
+	 */
+	public int getTotal() {
+		return total;
+	}
+
+	/**
+	 * Returns how many unique items the multiset contains.
+	 */
+	public int getUnique() {
+		return map.size();
+	}
+
+	/**
+	 * Returns how many of the given item the multiset contains.
+	 */
+	public int getCount(T t) {
+		Integer count = map.get(t);
+		return count == null ? 0 : count;
+	}
+
+	/**
+	 * Adds the given item to the multiset and returns how many of the item
+	 * the multiset now contains.
+	 */
+	public int add(T t) {
+		Integer count = map.get(t);
+		if (count == null) count = 0;
+		map.put(t, count + 1);
+		total++;
+		return count + 1;
+	}
+
+	/**
+	 * Removes the given item from the multiset and returns how many of the
+	 * item the multiset now contains.
+	 * @throws NoSuchElementException if the item is not in the multiset.
+	 */
+	public int remove(T t) {
+		Integer count = map.get(t);
+		if (count == null) throw new NoSuchElementException();
+		if (count == 1) map.remove(t);
+		else map.put(t, count - 1);
+		total--;
+		return count - 1;
+	}
+
+	/**
+	 * Removes all occurrences of the given item from the multiset.
+	 */
+	public int removeAll(T t) {
+		Integer count = map.remove(t);
+		if (count == null) return 0;
+		total -= count;
+		return count;
+	}
+
+	/**
+	 * Returns true if the multiset contains any occurrences of the given item.
+	 */
+	public boolean contains(T t) {
+		return map.containsKey(t);
+	}
+
+	/**
+	 * Removes all items from the multiset.
+	 */
+	public void clear() {
+		map.clear();
+		total = 0;
+	}
+
+	/**
+	 * Returns the set of unique items the multiset contains. The returned set
+	 * is unmodifiable.
+	 */
+	public Set<T> keySet() {
+		return Collections.unmodifiableSet(map.keySet());
+	}
+}

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

@@ -1,12 +1,10 @@
-package org.briarproject.api;
+package org.briarproject.bramble.api;
 
 import java.util.Hashtable;
 import java.util.Map;
 
 public abstract class StringMap extends Hashtable<String, String> {
 
-	private static final long serialVersionUID = 2497176435908100448L;
-
 	protected StringMap(Map<String, String> m) {
 		super(m);
 	}

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

@@ -0,0 +1,20 @@
+package org.briarproject.bramble.api;
+
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+import javax.annotation.concurrent.ThreadSafe;
+
+@ThreadSafe
+@NotNullByDefault
+public abstract class UniqueId extends Bytes {
+
+	/**
+	 * The length of a unique identifier in bytes.
+	 */
+	public static final int LENGTH = 32;
+
+	protected UniqueId(byte[] id) {
+		super(id);
+		if (id.length != LENGTH) throw new IllegalArgumentException();
+	}
+}

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

@@ -0,0 +1,9 @@
+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/BdfMessageContext.java

@@ -0,0 +1,36 @@
+package org.briarproject.bramble.api.client;
+
+import org.briarproject.bramble.api.data.BdfDictionary;
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.api.sync.MessageId;
+
+import java.util.Collection;
+import java.util.Collections;
+
+import javax.annotation.concurrent.Immutable;
+
+@Immutable
+@NotNullByDefault
+public class BdfMessageContext {
+
+	private final BdfDictionary dictionary;
+	private final Collection<MessageId> dependencies;
+
+	public BdfMessageContext(BdfDictionary dictionary,
+			Collection<MessageId> dependencies) {
+		this.dictionary = dictionary;
+		this.dependencies = dependencies;
+	}
+
+	public BdfMessageContext(BdfDictionary dictionary) {
+		this(dictionary, Collections.emptyList());
+	}
+
+	public BdfDictionary getDictionary() {
+		return dictionary;
+	}
+
+	public Collection<MessageId> getDependencies() {
+		return dependencies;
+	}
+}

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

@@ -0,0 +1,66 @@
+package org.briarproject.bramble.api.client;
+
+import org.briarproject.bramble.api.FormatException;
+import org.briarproject.bramble.api.data.BdfList;
+import org.briarproject.bramble.api.data.MetadataEncoder;
+import org.briarproject.bramble.api.db.Metadata;
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+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.ValidationManager.MessageValidator;
+import org.briarproject.bramble.api.system.Clock;
+
+import java.util.logging.Logger;
+
+import javax.annotation.concurrent.Immutable;
+
+import static org.briarproject.bramble.api.sync.SyncConstants.MESSAGE_HEADER_LENGTH;
+import static org.briarproject.bramble.api.transport.TransportConstants.MAX_CLOCK_DIFFERENCE;
+
+@Immutable
+@NotNullByDefault
+public abstract class BdfMessageValidator implements MessageValidator {
+
+	protected static final Logger LOG =
+			Logger.getLogger(BdfMessageValidator.class.getName());
+
+	protected final ClientHelper clientHelper;
+	protected final MetadataEncoder metadataEncoder;
+	protected final Clock clock;
+
+	protected BdfMessageValidator(ClientHelper clientHelper,
+			MetadataEncoder metadataEncoder, Clock clock) {
+		this.clientHelper = clientHelper;
+		this.metadataEncoder = metadataEncoder;
+		this.clock = clock;
+	}
+
+	protected abstract BdfMessageContext validateMessage(Message m, Group g,
+			BdfList body) throws InvalidMessageException, FormatException;
+
+	@Override
+	public MessageContext validateMessage(Message m, Group g)
+			throws InvalidMessageException {
+		// Reject the message if it's too far in the future
+		long now = clock.currentTimeMillis();
+		if (m.getTimestamp() - now > MAX_CLOCK_DIFFERENCE) {
+			throw new InvalidMessageException(
+					"Timestamp is too far in the future");
+		}
+		byte[] raw = m.getRaw();
+		if (raw.length <= MESSAGE_HEADER_LENGTH) {
+			throw new InvalidMessageException("Message is too short");
+		}
+		try {
+			BdfList body = clientHelper.toList(raw, MESSAGE_HEADER_LENGTH,
+					raw.length - MESSAGE_HEADER_LENGTH);
+			BdfMessageContext result = validateMessage(m, g, body);
+			Metadata meta = metadataEncoder.encode(result.getDictionary());
+			return new MessageContext(meta, result.getDependencies());
+		} catch (FormatException e) {
+			throw new InvalidMessageException(e);
+		}
+	}
+}

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

@@ -0,0 +1,119 @@
+package org.briarproject.bramble.api.client;
+
+import org.briarproject.bramble.api.FormatException;
+import org.briarproject.bramble.api.data.BdfDictionary;
+import org.briarproject.bramble.api.data.BdfList;
+import org.briarproject.bramble.api.db.DbException;
+import org.briarproject.bramble.api.db.Transaction;
+import org.briarproject.bramble.api.identity.Author;
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.api.plugin.TransportId;
+import org.briarproject.bramble.api.properties.TransportProperties;
+import org.briarproject.bramble.api.sync.GroupId;
+import org.briarproject.bramble.api.sync.Message;
+import org.briarproject.bramble.api.sync.MessageId;
+
+import java.security.GeneralSecurityException;
+import java.util.Map;
+
+import javax.annotation.Nullable;
+
+@NotNullByDefault
+public interface ClientHelper {
+
+	void addLocalMessage(Message m, BdfDictionary metadata, boolean shared)
+			throws DbException, FormatException;
+
+	void addLocalMessage(Transaction txn, Message m, BdfDictionary metadata,
+			boolean shared) throws DbException, FormatException;
+
+	Message createMessage(GroupId g, long timestamp, BdfList body)
+			throws FormatException;
+
+	Message createMessageForStoringMetadata(GroupId g);
+
+	@Nullable
+	Message getMessage(MessageId m) throws DbException;
+
+	@Nullable
+	Message getMessage(Transaction txn, MessageId m) throws DbException;
+
+	@Nullable
+	BdfList getMessageAsList(MessageId m) throws DbException, FormatException;
+
+	@Nullable
+	BdfList getMessageAsList(Transaction txn, MessageId m) throws DbException,
+			FormatException;
+
+	BdfDictionary getGroupMetadataAsDictionary(GroupId g) throws DbException,
+			FormatException;
+
+	BdfDictionary getGroupMetadataAsDictionary(Transaction txn, GroupId g)
+			throws DbException, FormatException;
+
+	BdfDictionary getMessageMetadataAsDictionary(MessageId m)
+			throws DbException,
+			FormatException;
+
+	BdfDictionary getMessageMetadataAsDictionary(Transaction txn, MessageId m)
+			throws DbException, FormatException;
+
+	Map<MessageId, BdfDictionary> getMessageMetadataAsDictionary(GroupId g)
+			throws DbException, FormatException;
+
+	Map<MessageId, BdfDictionary> getMessageMetadataAsDictionary(
+			Transaction txn, GroupId g) throws DbException, FormatException;
+
+	Map<MessageId, BdfDictionary> getMessageMetadataAsDictionary(GroupId g,
+			BdfDictionary query) throws DbException, FormatException;
+
+	Map<MessageId, BdfDictionary> getMessageMetadataAsDictionary(
+			Transaction txn, GroupId g, BdfDictionary query) throws DbException,
+			FormatException;
+
+	void mergeGroupMetadata(GroupId g, BdfDictionary metadata)
+			throws DbException, FormatException;
+
+	void mergeGroupMetadata(Transaction txn, GroupId g, BdfDictionary metadata)
+			throws DbException, FormatException;
+
+	void mergeMessageMetadata(MessageId m, BdfDictionary metadata)
+			throws DbException, FormatException;
+
+	void mergeMessageMetadata(Transaction txn, MessageId m,
+			BdfDictionary metadata) throws DbException, FormatException;
+
+	byte[] toByteArray(BdfDictionary dictionary) throws FormatException;
+
+	byte[] toByteArray(BdfList list) throws FormatException;
+
+	BdfDictionary toDictionary(byte[] b, int off, int len)
+			throws FormatException;
+
+	BdfDictionary toDictionary(TransportProperties transportProperties);
+
+	BdfDictionary toDictionary(Map<TransportId, TransportProperties> map);
+
+	BdfList toList(byte[] b, int off, int len) throws FormatException;
+
+	BdfList toList(byte[] b) throws FormatException;
+
+	BdfList toList(Message m) throws FormatException;
+
+	BdfList toList(Author a);
+
+	byte[] sign(String label, BdfList toSign, byte[] privateKey)
+			throws FormatException, GeneralSecurityException;
+
+	void verifySignature(byte[] signature, String label, BdfList signed,
+			byte[] publicKey) throws FormatException, GeneralSecurityException;
+
+	Author parseAndValidateAuthor(BdfList author) throws FormatException;
+
+	TransportProperties parseAndValidateTransportProperties(
+			BdfDictionary properties) throws FormatException;
+
+	Map<TransportId, TransportProperties> parseAndValidateTransportPropertiesMap(
+			BdfDictionary properties) throws FormatException;
+
+}

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

@@ -0,0 +1,30 @@
+package org.briarproject.bramble.api.client;
+
+import org.briarproject.bramble.api.contact.Contact;
+import org.briarproject.bramble.api.identity.AuthorId;
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.api.sync.ClientId;
+import org.briarproject.bramble.api.sync.Group;
+
+@NotNullByDefault
+public interface ContactGroupFactory {
+
+	/**
+	 * Creates a group that is not shared with any contacts.
+	 */
+	Group createLocalGroup(ClientId clientId, int majorVersion);
+
+	/**
+	 * Creates a group for the given client to share with the given contact.
+	 */
+	Group createContactGroup(ClientId clientId, int majorVersion,
+			Contact contact);
+
+	/**
+	 * Creates a group for the given client to share between the given authors
+	 * identified by their AuthorIds.
+	 */
+	Group createContactGroup(ClientId clientId, int majorVersion,
+			AuthorId authorId1, AuthorId authorId2);
+
+}

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

@@ -0,0 +1,56 @@
+package org.briarproject.bramble.api.contact;
+
+import org.briarproject.bramble.api.identity.Author;
+import org.briarproject.bramble.api.identity.AuthorId;
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+import javax.annotation.concurrent.Immutable;
+
+@Immutable
+@NotNullByDefault
+public class Contact {
+
+	private final ContactId id;
+	private final Author author;
+	private final AuthorId localAuthorId;
+	private final boolean verified, active;
+
+	public Contact(ContactId id, Author author, AuthorId localAuthorId,
+			boolean verified, boolean active) {
+		this.id = id;
+		this.author = author;
+		this.localAuthorId = localAuthorId;
+		this.verified = verified;
+		this.active = active;
+	}
+
+	public ContactId getId() {
+		return id;
+	}
+
+	public Author getAuthor() {
+		return author;
+	}
+
+	public AuthorId getLocalAuthorId() {
+		return localAuthorId;
+	}
+
+	public boolean isVerified() {
+		return verified;
+	}
+
+	public boolean isActive() {
+		return active;
+	}
+
+	@Override
+	public int hashCode() {
+		return id.hashCode();
+	}
+
+	@Override
+	public boolean equals(Object o) {
+		return o instanceof Contact && id.equals(((Contact) o).id);
+	}
+}

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

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

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

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

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

@@ -0,0 +1,34 @@
+package org.briarproject.bramble.api.contact;
+
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+import javax.annotation.concurrent.Immutable;
+
+/**
+ * Type-safe wrapper for an integer that uniquely identifies a contact within
+ * the scope of the local device.
+ */
+@Immutable
+@NotNullByDefault
+public class ContactId {
+
+	private final int id;
+
+	public ContactId(int id) {
+		this.id = id;
+	}
+
+	public int getInt() {
+		return id;
+	}
+
+	@Override
+	public int hashCode() {
+		return id;
+	}
+
+	@Override
+	public boolean equals(Object o) {
+		return o instanceof ContactId && id == ((ContactId) o).id;
+	}
+}

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

@@ -0,0 +1,114 @@
+package org.briarproject.bramble.api.contact;
+
+import org.briarproject.bramble.api.crypto.SecretKey;
+import org.briarproject.bramble.api.db.DbException;
+import org.briarproject.bramble.api.db.Transaction;
+import org.briarproject.bramble.api.identity.Author;
+import org.briarproject.bramble.api.identity.AuthorId;
+import org.briarproject.bramble.api.lifecycle.LifecycleManager;
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+import java.util.Collection;
+
+@NotNullByDefault
+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(SecretKey)}.
+	 */
+	void registerContactHook(ContactHook hook);
+
+	/**
+	 * Stores a contact associated with the given local and remote pseudonyms,
+	 * derives and stores transport keys for each transport, and returns an ID
+	 * for the contact.
+	 *
+	 * @param alice true if the local party is Alice
+	 */
+	ContactId addContact(Transaction txn, Author remote, AuthorId local,
+			SecretKey master, long timestamp, boolean alice, boolean verified,
+			boolean active) throws DbException;
+
+	/**
+	 * Stores a contact associated with the given local and remote pseudonyms
+	 * and returns an ID for the contact.
+	 */
+	ContactId addContact(Transaction txn, Author remote, AuthorId local,
+			boolean verified, boolean active) throws DbException;
+
+	/**
+	 * Stores a contact associated with the given local and remote pseudonyms,
+	 * derives and stores transport keys for each transport, and returns an ID
+	 * for the contact.
+	 *
+	 * @param alice true if the local party is Alice
+	 */
+	ContactId addContact(Author remote, AuthorId local, SecretKey master,
+			long timestamp, boolean alice, boolean verified, boolean active)
+			throws DbException;
+
+	/**
+	 * Returns the contact with the given ID.
+	 */
+	Contact getContact(ContactId c) throws DbException;
+
+	/**
+	 * Returns the contact with the given remoteAuthorId
+	 * that was added by the LocalAuthor with the given localAuthorId
+	 *
+	 * @throws org.briarproject.bramble.api.db.NoSuchContactException
+	 */
+	Contact getContact(AuthorId remoteAuthorId, AuthorId localAuthorId)
+			throws DbException;
+
+	/**
+	 * Returns the contact with the given remoteAuthorId
+	 * that was added by the LocalAuthor with the given localAuthorId
+	 *
+	 * @throws org.briarproject.bramble.api.db.NoSuchContactException
+	 */
+	Contact getContact(Transaction txn, AuthorId remoteAuthorId,
+			AuthorId localAuthorId) throws DbException;
+
+	/**
+	 * Returns all active contacts.
+	 */
+	Collection<Contact> getActiveContacts() throws DbException;
+
+	/**
+	 * Removes a contact and all associated state.
+	 */
+	void removeContact(ContactId c) throws DbException;
+
+	/**
+	 * Removes a contact and all associated state.
+	 */
+	void removeContact(Transaction txn, ContactId c) throws DbException;
+
+	/**
+	 * Marks a contact as active or inactive.
+	 */
+	void setContactActive(Transaction txn, ContactId c, boolean active)
+			throws DbException;
+
+	/**
+	 * Return true if a contact with this name and public key already exists
+	 */
+	boolean contactExists(Transaction txn, AuthorId remoteAuthorId,
+			AuthorId localAuthorId) throws DbException;
+
+	/**
+	 * Return true if a contact with this name and public key already exists
+	 */
+	boolean contactExists(AuthorId remoteAuthorId, AuthorId localAuthorId)
+			throws DbException;
+
+	interface ContactHook {
+
+		void addingContact(Transaction txn, Contact c) throws DbException;
+
+		void removingContact(Transaction txn, Contact c) throws DbException;
+	}
+}

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

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

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

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

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

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

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

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

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

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

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

@@ -0,0 +1,133 @@
+package org.briarproject.bramble.api.crypto;
+
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+import java.security.GeneralSecurityException;
+import java.security.SecureRandom;
+
+import javax.annotation.Nullable;
+
+@NotNullByDefault
+public interface CryptoComponent {
+
+	SecretKey generateSecretKey();
+
+	SecureRandom getSecureRandom();
+
+	KeyPair generateAgreementKeyPair();
+
+	KeyParser getAgreementKeyParser();
+
+	KeyPair generateSignatureKeyPair();
+
+	KeyParser getSignatureKeyParser();
+
+	KeyParser getMessageKeyParser();
+
+	/**
+	 * Derives another secret key from the given secret key.
+	 *
+	 * @param label a namespaced label indicating the purpose of the derived
+	 * key, to prevent it from being repurposed or colliding with a key derived
+	 * for another purpose
+	 */
+	SecretKey deriveKey(String label, SecretKey k, byte[]... inputs);
+
+	/**
+	 * Derives a common shared secret from two public keys and one of the
+	 * corresponding private keys.
+	 *
+	 * @param label a namespaced label indicating the purpose of this shared
+	 * secret, to prevent it from being repurposed or colliding with a shared
+	 * secret derived for another purpose
+	 * @param theirPublicKey the public key of the remote party
+	 * @param ourKeyPair the key pair of the local party
+	 * @return the shared secret
+	 */
+	SecretKey deriveSharedSecret(String label, PublicKey theirPublicKey,
+			KeyPair ourKeyPair, byte[]... inputs)
+			throws GeneralSecurityException;
+
+	/**
+	 * Signs the given byte[] with the given private key.
+	 *
+	 * @param label a namespaced label indicating the purpose of this
+	 * signature, to prevent it from being repurposed or colliding with a
+	 * signature created for another purpose
+	 */
+	byte[] sign(String label, byte[] toSign, byte[] privateKey)
+			throws GeneralSecurityException;
+
+	/**
+	 * Verifies that the given signature is valid for the signed data
+	 * and the given public key.
+	 *
+	 * @param label a namespaced label indicating the purpose of this
+	 * signature, to prevent it from being repurposed or colliding with a
+	 * signature created for another purpose
+	 * @return true if the signature was valid, false otherwise.
+	 */
+	boolean verifySignature(byte[] signature, String label, byte[] signed,
+			byte[] publicKey) throws GeneralSecurityException;
+
+	/**
+	 * Returns the hash of the given inputs. The inputs are unambiguously
+	 * combined by prefixing each input with its length.
+	 *
+	 * @param label a namespaced label indicating the purpose of this hash, to
+	 * prevent it from being repurposed or colliding with a hash created for
+	 * another purpose
+	 */
+	byte[] hash(String label, byte[]... inputs);
+
+	/**
+	 * Returns a message authentication code with the given key over the
+	 * given inputs. The inputs are unambiguously combined by prefixing each
+	 * input with its length.
+	 *
+	 * @param label a namespaced label indicating the purpose of this MAC, to
+	 * prevent it from being repurposed or colliding with a MAC created for
+	 * another purpose
+	 */
+	byte[] mac(String label, SecretKey macKey, byte[]... inputs);
+
+	/**
+	 * Verifies that the given message authentication code is valid for the
+	 * given secret key and inputs.
+	 *
+	 * @param label a namespaced label indicating the purpose of this MAC, to
+	 * prevent it from being repurposed or colliding with a MAC created for
+	 * another purpose
+	 * @return true if the MAC was valid, false otherwise.
+	 */
+	boolean verifyMac(byte[] mac, String label, SecretKey macKey,
+			byte[]... inputs);
+
+	/**
+	 * Encrypts and authenticates the given plaintext so it can be written to
+	 * storage. The encryption and authentication keys are derived from the
+	 * given password. The ciphertext will be decryptable using the same
+	 * password after the app restarts.
+	 */
+	byte[] encryptWithPassword(byte[] plaintext, String password);
+
+	/**
+	 * Decrypts and authenticates the given ciphertext that has been read from
+	 * storage. The encryption and authentication keys are derived from the
+	 * given password. Returns null if the ciphertext cannot be decrypted and
+	 * authenticated (for example, if the password is wrong).
+	 */
+	@Nullable
+	byte[] decryptWithPassword(byte[] ciphertext, String password);
+
+	/**
+	 * Encrypts the given plaintext to the given public key.
+	 */
+	byte[] encryptToKey(PublicKey publicKey, byte[] plaintext);
+
+	/**
+	 * Encodes the given data as a hex string divided into lines of the given
+	 * length. The line terminator is CRLF.
+	 */
+	String asciiArmour(byte[] b, int lineLength);
+}

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

@@ -0,0 +1,25 @@
+package org.briarproject.bramble.api.crypto;
+
+public interface CryptoConstants {
+
+	/**
+	 * The maximum length of an agreement public key in bytes.
+	 */
+	int MAX_AGREEMENT_PUBLIC_KEY_BYTES = 32;
+
+	/**
+	 * The maximum length of a signature public key in bytes.
+	 */
+	int MAX_SIGNATURE_PUBLIC_KEY_BYTES = 32;
+
+	/**
+	 * The maximum length of a signature in bytes.
+	 */
+	int MAX_SIGNATURE_BYTES = 64;
+
+	/**
+	 * The length of a MAC in bytes.
+	 */
+	int MAC_BYTES = SecretKey.LENGTH;
+
+}

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

@@ -0,0 +1,25 @@
+package org.briarproject.bramble.api.crypto;
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.Target;
+
+import javax.inject.Qualifier;
+
+import static java.lang.annotation.ElementType.FIELD;
+import static java.lang.annotation.ElementType.METHOD;
+import static java.lang.annotation.ElementType.PARAMETER;
+import static java.lang.annotation.RetentionPolicy.RUNTIME;
+
+/**
+ * Annotation for injecting the executor for long-running crypto tasks. Also
+ * used for annotating methods that should run on the crypto executor.
+ * <p>
+ * The contract of this executor is that tasks may be run concurrently, and
+ * submitting a task will never block. Tasks must not run indefinitely. Tasks
+ * submitted during shutdown are discarded.
+ */
+@Qualifier
+@Target({FIELD, METHOD, PARAMETER})
+@Retention(RUNTIME)
+public @interface CryptoExecutor {
+}

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

@@ -0,0 +1,50 @@
+package org.briarproject.bramble.api.crypto;
+
+/**
+ * Crypto operations for the key agreement protocol - see
+ * https://code.briarproject.org/akwizgran/briar-spec/blob/master/protocols/BQP.md
+ */
+public interface KeyAgreementCrypto {
+
+	/**
+	 * Hash label for public key commitment.
+	 */
+	String COMMIT_LABEL = "org.briarproject.bramble.keyagreement/COMMIT";
+
+	/**
+	 * Key derivation label for confirmation record.
+	 */
+	String CONFIRMATION_KEY_LABEL =
+			"org.briarproject.bramble.keyagreement/CONFIRMATION_KEY";
+
+	/**
+	 * MAC label for confirmation record.
+	 */
+	String CONFIRMATION_MAC_LABEL =
+			"org.briarproject.bramble.keyagreement/CONFIRMATION_MAC";
+
+	/**
+	 * Derives a commitment to the provided public key.
+	 *
+	 * @param publicKey the public key
+	 * @return the commitment to the provided public key.
+	 */
+	byte[] deriveKeyCommitment(PublicKey publicKey);
+
+	/**
+	 * Derives the content of a confirmation record.
+	 *
+	 * @param sharedSecret the common shared secret
+	 * @param theirPayload the key exchange payload of the remote party
+	 * @param ourPayload the key exchange payload of the local party
+	 * @param theirPublicKey the ephemeral public key of the remote party
+	 * @param ourKeyPair our ephemeral key pair of the local party
+	 * @param alice true if the local party is Alice
+	 * @param aliceRecord true if the confirmation record is for use by Alice
+	 * @return the confirmation record
+	 */
+	byte[] deriveConfirmationRecord(SecretKey sharedSecret,
+			byte[] theirPayload, byte[] ourPayload,
+			PublicKey theirPublicKey, KeyPair ourKeyPair,
+			boolean alice, boolean aliceRecord);
+}

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

@@ -0,0 +1,29 @@
+package org.briarproject.bramble.api.crypto;
+
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+import javax.annotation.concurrent.Immutable;
+
+/**
+ * A key pair consisting of a {@link PublicKey} and a {@link PrivateKey}.
+ */
+@Immutable
+@NotNullByDefault
+public class KeyPair {
+
+	private final PublicKey publicKey;
+	private final PrivateKey privateKey;
+
+	public KeyPair(PublicKey publicKey, PrivateKey privateKey) {
+		this.publicKey = publicKey;
+		this.privateKey = privateKey;
+	}
+
+	public PublicKey getPublic() {
+		return publicKey;
+	}
+
+	public PrivateKey getPrivate() {
+		return privateKey;
+	}
+}

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

@@ -0,0 +1,14 @@
+package org.briarproject.bramble.api.crypto;
+
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+import java.security.GeneralSecurityException;
+
+@NotNullByDefault
+public interface KeyParser {
+
+	PublicKey parsePublicKey(byte[] encodedKey) throws GeneralSecurityException;
+
+	PrivateKey parsePrivateKey(byte[] encodedKey)
+			throws GeneralSecurityException;
+}

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

@@ -0,0 +1,19 @@
+package org.briarproject.bramble.api.crypto;
+
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+@NotNullByDefault
+public interface PasswordStrengthEstimator {
+
+	float NONE = 0;
+	float WEAK = 0.25f;
+	float QUITE_WEAK = 0.5f;
+	float QUITE_STRONG = 0.75f;
+	float STRONG = 1;
+
+	/**
+	 * Returns an estimate between 0 (weakest) and 1 (strongest), inclusive,
+	 * of the strength of the given password.
+	 */
+	float estimateStrength(String password);
+}

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

@@ -0,0 +1,15 @@
+package org.briarproject.bramble.api.crypto;
+
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+/**
+ * The private half of a public/private {@link KeyPair}.
+ */
+@NotNullByDefault
+public interface PrivateKey {
+
+	/**
+	 * Returns the encoded representation of this key.
+	 */
+	byte[] getEncoded();
+}

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

@@ -0,0 +1,15 @@
+package org.briarproject.bramble.api.crypto;
+
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+/**
+ * The public half of a public/private {@link KeyPair}.
+ */
+@NotNullByDefault
+public interface PublicKey {
+
+	/**
+	 * Returns the encoded representation of this key.
+	 */
+	byte[] getEncoded();
+}

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

@@ -0,0 +1,23 @@
+package org.briarproject.bramble.api.crypto;
+
+/**
+ * A secret key used for encryption and/or authentication.
+ */
+public class SecretKey {
+
+	/**
+	 * The length of a secret key in bytes.
+	 */
+	public static final int LENGTH = 32;
+
+	private final byte[] key;
+
+	public SecretKey(byte[] key) {
+		if (key.length != LENGTH) throw new IllegalArgumentException();
+		this.key = key;
+	}
+
+	public byte[] getBytes() {
+		return key;
+	}
+}

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

@@ -0,0 +1,18 @@
+package org.briarproject.bramble.api.crypto;
+
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+import java.io.IOException;
+
+@NotNullByDefault
+public interface StreamDecrypter {
+
+	/**
+	 * Reads a frame, decrypts its payload into the given buffer and returns
+	 * the payload length, or -1 if no more frames can be read from the stream.
+	 *
+	 * @throws IOException if an error occurs while reading the frame,
+	 * or if authenticated decryption fails.
+	 */
+	int readFrame(byte[] payload) throws IOException;
+}

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

@@ -0,0 +1,22 @@
+package org.briarproject.bramble.api.crypto;
+
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.api.transport.StreamContext;
+
+import java.io.InputStream;
+
+@NotNullByDefault
+public interface StreamDecrypterFactory {
+
+	/**
+	 * Creates a {@link StreamDecrypter} for decrypting a transport stream.
+	 */
+	StreamDecrypter createStreamDecrypter(InputStream in, StreamContext ctx);
+
+	/**
+	 * Creates a {@link StreamDecrypter} for decrypting a contact exchange
+	 * stream.
+	 */
+	StreamDecrypter createContactExchangeStreamDecrypter(InputStream in,
+			SecretKey headerKey);
+}

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

@@ -0,0 +1,20 @@
+package org.briarproject.bramble.api.crypto;
+
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+import java.io.IOException;
+
+@NotNullByDefault
+public interface StreamEncrypter {
+
+	/**
+	 * Encrypts the given frame and writes it to the stream.
+	 */
+	void writeFrame(byte[] payload, int payloadLength, int paddingLength,
+			boolean finalFrame) throws IOException;
+
+	/**
+	 * Flushes the stream.
+	 */
+	void flush() throws IOException;
+}

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

@@ -0,0 +1,22 @@
+package org.briarproject.bramble.api.crypto;
+
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.api.transport.StreamContext;
+
+import java.io.OutputStream;
+
+@NotNullByDefault
+public interface StreamEncrypterFactory {
+
+	/**
+	 * Creates a {@link StreamEncrypter} for encrypting a transport stream.
+	 */
+	StreamEncrypter createStreamEncrypter(OutputStream out, StreamContext ctx);
+
+	/**
+	 * Creates a {@link StreamEncrypter} for encrypting a contact exchange
+	 * stream.
+	 */
+	StreamEncrypter createContactExchangeStreamDecrypter(OutputStream out,
+			SecretKey headerKey);
+}

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

@@ -0,0 +1,33 @@
+package org.briarproject.bramble.api.crypto;
+
+import org.briarproject.bramble.api.plugin.TransportId;
+import org.briarproject.bramble.api.transport.TransportKeys;
+
+/**
+ * Crypto operations for the transport security protocol - see
+ * https://code.briarproject.org/akwizgran/briar-spec/blob/master/protocols/BTP.md
+ */
+public interface TransportCrypto {
+
+	/**
+	 * Derives initial transport keys for the given transport in the given
+	 * rotation period from the given master secret.
+	 *
+	 * @param alice whether the keys are for use by Alice or Bob.
+	 * @param active whether the keys are usable for outgoing streams.
+	 */
+	TransportKeys deriveTransportKeys(TransportId t, SecretKey master,
+			long rotationPeriod, boolean alice, boolean active);
+
+	/**
+	 * Rotates the given transport keys to the given rotation period. If the
+	 * keys are for the given period or any later period they are not rotated.
+	 */
+	TransportKeys rotateTransportKeys(TransportKeys k, long rotationPeriod);
+
+	/**
+	 * Encodes the pseudo-random tag that is used to recognise a stream.
+	 */
+	void encodeTag(byte[] tag, SecretKey tagKey, int protocolVersion,
+			long streamNumber);
+}

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

@@ -1,13 +1,17 @@
-package org.briarproject.api.data;
+package org.briarproject.bramble.api.data;
 
-import org.briarproject.api.Bytes;
-import org.briarproject.api.FormatException;
+import org.briarproject.bramble.api.Bytes;
+import org.briarproject.bramble.api.FormatException;
 
-import java.util.Hashtable;
 import java.util.Map;
 import java.util.Map.Entry;
+import java.util.TreeMap;
 
-public class BdfDictionary extends Hashtable<String, Object> {
+import javax.annotation.Nullable;
+import javax.annotation.concurrent.NotThreadSafe;
+
+@NotThreadSafe
+public class BdfDictionary extends TreeMap<String, Object> {
 
 	public static final Object NULL_VALUE = new Object();
 
@@ -20,9 +24,9 @@ public class BdfDictionary extends Hashtable<String, Object> {
 	 * );
 	 * </pre>
 	 */
-	public static BdfDictionary of(Entry<String, Object>... entries) {
+	public static BdfDictionary of(Entry<String, ?>... entries) {
 		BdfDictionary d = new BdfDictionary();
-		for (Entry<String, Object> e : entries) d.put(e.getKey(), e.getValue());
+		for (Entry<String, ?> e : entries) d.put(e.getKey(), e.getValue());
 		return d;
 	}
 
@@ -30,7 +34,7 @@ public class BdfDictionary extends Hashtable<String, Object> {
 		super();
 	}
 
-	public BdfDictionary(Map<String, Object> m) {
+	public BdfDictionary(Map<String, ?> m) {
 		super(m);
 	}
 
@@ -40,6 +44,7 @@ public class BdfDictionary extends Hashtable<String, Object> {
 		throw new FormatException();
 	}
 
+	@Nullable
 	public Boolean getOptionalBoolean(String key) throws FormatException {
 		Object o = get(key);
 		if (o == null || o == NULL_VALUE) return null;
@@ -62,6 +67,7 @@ public class BdfDictionary extends Hashtable<String, Object> {
 		throw new FormatException();
 	}
 
+	@Nullable
 	public Long getOptionalLong(String key) throws FormatException {
 		Object o = get(key);
 		if (o == null || o == NULL_VALUE) return null;
@@ -88,6 +94,7 @@ public class BdfDictionary extends Hashtable<String, Object> {
 		throw new FormatException();
 	}
 
+	@Nullable
 	public Double getOptionalDouble(String key) throws FormatException {
 		Object o = get(key);
 		if (o == null || o == NULL_VALUE) return null;
@@ -109,6 +116,7 @@ public class BdfDictionary extends Hashtable<String, Object> {
 		throw new FormatException();
 	}
 
+	@Nullable
 	public String getOptionalString(String key) throws FormatException {
 		Object o = get(key);
 		if (o == null || o == NULL_VALUE) return null;
@@ -129,6 +137,7 @@ public class BdfDictionary extends Hashtable<String, Object> {
 		throw new FormatException();
 	}
 
+	@Nullable
 	public byte[] getOptionalRaw(String key) throws FormatException {
 		Object o = get(key);
 		if (o == null || o == NULL_VALUE) return null;
@@ -150,6 +159,7 @@ public class BdfDictionary extends Hashtable<String, Object> {
 		throw new FormatException();
 	}
 
+	@Nullable
 	public BdfList getOptionalList(String key) throws FormatException {
 		Object o = get(key);
 		if (o == null || o == NULL_VALUE) return null;
@@ -169,6 +179,7 @@ public class BdfDictionary extends Hashtable<String, Object> {
 		throw new FormatException();
 	}
 
+	@Nullable
 	public BdfDictionary getOptionalDictionary(String key)
 			throws FormatException {
 		Object o = get(key);

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

@@ -0,0 +1,41 @@
+package org.briarproject.bramble.api.data;
+
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+import java.util.Map.Entry;
+
+import javax.annotation.concurrent.Immutable;
+
+@Immutable
+@NotNullByDefault
+public class BdfEntry implements Entry<String, Object>, Comparable<BdfEntry> {
+
+	private final String key;
+	private final Object value;
+
+	public BdfEntry(String key, Object value) {
+		this.key = key;
+		this.value = value;
+	}
+
+	@Override
+	public String getKey() {
+		return key;
+	}
+
+	@Override
+	public Object getValue() {
+		return value;
+	}
+
+	@Override
+	public Object setValue(Object value) {
+		throw new UnsupportedOperationException();
+	}
+
+	@Override
+	public int compareTo(BdfEntry e) {
+		if (e == this) return 0;
+		return key.compareTo(e.key);
+	}
+}

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

@@ -1,15 +1,19 @@
-package org.briarproject.api.data;
+package org.briarproject.bramble.api.data;
 
-import org.briarproject.api.Bytes;
-import org.briarproject.api.FormatException;
+import org.briarproject.bramble.api.Bytes;
+import org.briarproject.bramble.api.FormatException;
 
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
-import java.util.Vector;
 
-import static org.briarproject.api.data.BdfDictionary.NULL_VALUE;
+import javax.annotation.Nullable;
+import javax.annotation.concurrent.NotThreadSafe;
 
-public class BdfList extends Vector<Object> {
+import static org.briarproject.bramble.api.data.BdfDictionary.NULL_VALUE;
+
+@NotThreadSafe
+public class BdfList extends ArrayList<Object> {
 
 	/**
 	 * Factory method for constructing lists inline.
@@ -29,13 +33,20 @@ public class BdfList extends Vector<Object> {
 		super(items);
 	}
 
+	private boolean isInRange(int index) {
+		return index >= 0 && index < size();
+	}
+
 	public Boolean getBoolean(int index) throws FormatException {
+		if (!isInRange(index)) throw new FormatException();
 		Object o = get(index);
 		if (o instanceof Boolean) return (Boolean) o;
 		throw new FormatException();
 	}
 
+	@Nullable
 	public Boolean getOptionalBoolean(int index) throws FormatException {
+		if (!isInRange(index)) throw new FormatException();
 		Object o = get(index);
 		if (o == null || o == NULL_VALUE) return null;
 		if (o instanceof Boolean) return (Boolean) o;
@@ -43,12 +54,14 @@ public class BdfList extends Vector<Object> {
 	}
 
 	public Boolean getBoolean(int index, Boolean defaultValue) {
+		if (!isInRange(index)) return defaultValue;
 		Object o = get(index);
 		if (o instanceof Boolean) return (Boolean) o;
 		return defaultValue;
 	}
 
 	public Long getLong(int index) throws FormatException {
+		if (!isInRange(index)) throw new FormatException();
 		Object o = get(index);
 		if (o instanceof Long) return (Long) o;
 		if (o instanceof Integer) return ((Integer) o).longValue();
@@ -57,7 +70,9 @@ public class BdfList extends Vector<Object> {
 		throw new FormatException();
 	}
 
+	@Nullable
 	public Long getOptionalLong(int index) throws FormatException {
+		if (!isInRange(index)) throw new FormatException();
 		Object o = get(index);
 		if (o == null || o == NULL_VALUE) return null;
 		if (o instanceof Long) return (Long) o;
@@ -68,6 +83,7 @@ public class BdfList extends Vector<Object> {
 	}
 
 	public Long getLong(int index, Long defaultValue) {
+		if (!isInRange(index)) return defaultValue;
 		Object o = get(index);
 		if (o instanceof Long) return (Long) o;
 		if (o instanceof Integer) return ((Integer) o).longValue();
@@ -77,13 +93,16 @@ public class BdfList extends Vector<Object> {
 	}
 
 	public Double getDouble(int index) throws FormatException {
+		if (!isInRange(index)) throw new FormatException();
 		Object o = get(index);
 		if (o instanceof Double) return (Double) o;
 		if (o instanceof Float) return ((Float) o).doubleValue();
 		throw new FormatException();
 	}
 
+	@Nullable
 	public Double getOptionalDouble(int index) throws FormatException {
+		if (!isInRange(index)) throw new FormatException();
 		Object o = get(index);
 		if (o == null || o == NULL_VALUE) return null;
 		if (o instanceof Double) return (Double) o;
@@ -92,6 +111,7 @@ public class BdfList extends Vector<Object> {
 	}
 
 	public Double getDouble(int index, Double defaultValue) {
+		if (!isInRange(index)) return defaultValue;
 		Object o = get(index);
 		if (o instanceof Double) return (Double) o;
 		if (o instanceof Float) return ((Float) o).doubleValue();
@@ -99,12 +119,15 @@ public class BdfList extends Vector<Object> {
 	}
 
 	public String getString(int index) throws FormatException {
+		if (!isInRange(index)) throw new FormatException();
 		Object o = get(index);
 		if (o instanceof String) return (String) o;
 		throw new FormatException();
 	}
 
+	@Nullable
 	public String getOptionalString(int index) throws FormatException {
+		if (!isInRange(index)) throw new FormatException();
 		Object o = get(index);
 		if (o == null || o == NULL_VALUE) return null;
 		if (o instanceof String) return (String) o;
@@ -112,19 +135,23 @@ public class BdfList extends Vector<Object> {
 	}
 
 	public String getString(int index, String defaultValue) {
+		if (!isInRange(index)) return defaultValue;
 		Object o = get(index);
 		if (o instanceof String) return (String) o;
 		return defaultValue;
 	}
 
 	public byte[] getRaw(int index) throws FormatException {
+		if (!isInRange(index)) throw new FormatException();
 		Object o = get(index);
 		if (o instanceof byte[]) return (byte[]) o;
 		if (o instanceof Bytes) return ((Bytes) o).getBytes();
 		throw new FormatException();
 	}
 
+	@Nullable
 	public byte[] getOptionalRaw(int index) throws FormatException {
+		if (!isInRange(index)) throw new FormatException();
 		Object o = get(index);
 		if (o == null || o == NULL_VALUE) return null;
 		if (o instanceof byte[]) return (byte[]) o;
@@ -133,6 +160,7 @@ public class BdfList extends Vector<Object> {
 	}
 
 	public byte[] getRaw(int index, byte[] defaultValue) {
+		if (!isInRange(index)) return defaultValue;
 		Object o = get(index);
 		if (o instanceof byte[]) return (byte[]) o;
 		if (o instanceof Bytes) return ((Bytes) o).getBytes();
@@ -140,12 +168,15 @@ public class BdfList extends Vector<Object> {
 	}
 
 	public BdfList getList(int index) throws FormatException {
+		if (!isInRange(index)) throw new FormatException();
 		Object o = get(index);
 		if (o instanceof BdfList) return (BdfList) o;
 		throw new FormatException();
 	}
 
+	@Nullable
 	public BdfList getOptionalList(int index) throws FormatException {
+		if (!isInRange(index)) throw new FormatException();
 		Object o = get(index);
 		if (o == null || o == NULL_VALUE) return null;
 		if (o instanceof BdfList) return (BdfList) o;
@@ -153,19 +184,23 @@ public class BdfList extends Vector<Object> {
 	}
 
 	public BdfList getList(int index, BdfList defaultValue) {
+		if (!isInRange(index)) return defaultValue;
 		Object o = get(index);
 		if (o instanceof BdfList) return (BdfList) o;
 		return defaultValue;
 	}
 
 	public BdfDictionary getDictionary(int index) throws FormatException {
+		if (!isInRange(index)) throw new FormatException();
 		Object o = get(index);
 		if (o instanceof BdfDictionary) return (BdfDictionary) o;
 		throw new FormatException();
 	}
 
+	@Nullable
 	public BdfDictionary getOptionalDictionary(int index)
 			throws FormatException {
+		if (!isInRange(index)) throw new FormatException();
 		Object o = get(index);
 		if (o == null || o == NULL_VALUE) return null;
 		if (o instanceof BdfDictionary) return (BdfDictionary) o;
@@ -173,6 +208,7 @@ public class BdfList extends Vector<Object> {
 	}
 
 	public BdfDictionary getDictionary(int index, BdfDictionary defaultValue) {
+		if (!isInRange(index)) return defaultValue;
 		Object o = get(index);
 		if (o instanceof BdfDictionary) return (BdfDictionary) o;
 		return defaultValue;

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

@@ -1,47 +1,76 @@
-package org.briarproject.api.data;
+package org.briarproject.bramble.api.data;
+
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 
 import java.io.IOException;
 
+@NotNullByDefault
 public interface BdfReader {
 
+	int DEFAULT_NESTED_LIMIT = 5;
+	int DEFAULT_MAX_BUFFER_SIZE = 64 * 1024;
+
 	boolean eof() throws IOException;
+
 	void close() throws IOException;
 
 	boolean hasNull() throws IOException;
+
 	void readNull() throws IOException;
+
 	void skipNull() throws IOException;
 
 	boolean hasBoolean() throws IOException;
+
 	boolean readBoolean() throws IOException;
+
 	void skipBoolean() throws IOException;
 
 	boolean hasLong() throws IOException;
+
 	long readLong() throws IOException;
+
 	void skipLong() throws IOException;
 
 	boolean hasDouble() throws IOException;
+
 	double readDouble() throws IOException;
+
 	void skipDouble() throws IOException;
 
 	boolean hasString() throws IOException;
-	String readString(int maxLength) throws IOException;
+
+	String readString() throws IOException;
+
 	void skipString() throws IOException;
 
 	boolean hasRaw() throws IOException;
-	byte[] readRaw(int maxLength) throws IOException;
+
+	byte[] readRaw() throws IOException;
+
 	void skipRaw() throws IOException;
 
 	boolean hasList() throws IOException;
+
 	BdfList readList() throws IOException;
+
 	void readListStart() throws IOException;
+
 	boolean hasListEnd() throws IOException;
+
 	void readListEnd() throws IOException;
+
 	void skipList() throws IOException;
 
 	boolean hasDictionary() throws IOException;
+
 	BdfDictionary readDictionary() throws IOException;
+
 	void readDictionaryStart() throws IOException;
+
 	boolean hasDictionaryEnd() throws IOException;
+
 	void readDictionaryEnd() throws IOException;
+
 	void skipDictionary() throws IOException;
 }

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

@@ -0,0 +1,14 @@
+package org.briarproject.bramble.api.data;
+
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+import java.io.InputStream;
+
+@NotNullByDefault
+public interface BdfReaderFactory {
+
+	BdfReader createReader(InputStream in);
+
+	BdfReader createReader(InputStream in, int nestedLimit,
+			int maxBufferSize);
+}

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

@@ -1,4 +1,4 @@
-package org.briarproject.api.data;
+package org.briarproject.bramble.api.data;
 
 import java.io.IOException;
 import java.util.Collection;
@@ -7,20 +7,30 @@ import java.util.Map;
 public interface BdfWriter {
 
 	void flush() throws IOException;
+
 	void close() throws IOException;
 
 	void writeNull() throws IOException;
+
 	void writeBoolean(boolean b) throws IOException;
+
 	void writeLong(long l) throws IOException;
+
 	void writeDouble(double d) throws IOException;
+
 	void writeString(String s) throws IOException;
+
 	void writeRaw(byte[] b) throws IOException;
 
 	void writeList(Collection<?> c) throws IOException;
+
 	void writeListStart() throws IOException;
+
 	void writeListEnd() throws IOException;
 
 	void writeDictionary(Map<?, ?> m) throws IOException;
+
 	void writeDictionaryStart() throws IOException;
+
 	void writeDictionaryEnd() throws IOException;
 }

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

@@ -0,0 +1,11 @@
+package org.briarproject.bramble.api.data;
+
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+import java.io.OutputStream;
+
+@NotNullByDefault
+public interface BdfWriterFactory {
+
+	BdfWriter createWriter(OutputStream out);
+}

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

@@ -0,0 +1,11 @@
+package org.briarproject.bramble.api.data;
+
+import org.briarproject.bramble.api.FormatException;
+import org.briarproject.bramble.api.db.Metadata;
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+@NotNullByDefault
+public interface MetadataEncoder {
+
+	Metadata encode(BdfDictionary d) throws FormatException;
+}

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

@@ -0,0 +1,11 @@
+package org.briarproject.bramble.api.data;
+
+import org.briarproject.bramble.api.FormatException;
+import org.briarproject.bramble.api.db.Metadata;
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+@NotNullByDefault
+public interface MetadataParser {
+
+	BdfDictionary parse(Metadata m) throws FormatException;
+}

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

@@ -0,0 +1,8 @@
+package org.briarproject.bramble.api.db;
+
+/**
+ * Thrown when a duplicate contact is added to the database. This exception may
+ * occur due to concurrent updates and does not indicate a database error.
+ */
+public class ContactExistsException extends DbException {
+}

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

@@ -0,0 +1,7 @@
+package org.briarproject.bramble.api.db;
+
+/**
+ * Thrown when the database uses a newer schema than the current code.
+ */
+public class DataTooNewException extends DbException {
+}

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

@@ -0,0 +1,8 @@
+package org.briarproject.bramble.api.db;
+
+/**
+ * Thrown when the database uses an older schema than the current code and
+ * cannot be migrated.
+ */
+public class DataTooOldException extends DbException {
+}

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

@@ -0,0 +1,546 @@
+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;
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.api.plugin.TransportId;
+import org.briarproject.bramble.api.settings.Settings;
+import org.briarproject.bramble.api.sync.Ack;
+import org.briarproject.bramble.api.sync.ClientId;
+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.MessageId;
+import org.briarproject.bramble.api.sync.MessageStatus;
+import org.briarproject.bramble.api.sync.Offer;
+import org.briarproject.bramble.api.sync.Request;
+import org.briarproject.bramble.api.transport.KeySet;
+import org.briarproject.bramble.api.transport.KeySetId;
+import org.briarproject.bramble.api.transport.TransportKeys;
+
+import java.util.Collection;
+import java.util.Map;
+
+import javax.annotation.Nullable;
+
+import static org.briarproject.bramble.api.sync.ValidationManager.State;
+
+/**
+ * Encapsulates the database implementation and exposes high-level operations
+ * to other components.
+ */
+@NotNullByDefault
+public interface DatabaseComponent {
+
+	/**
+	 * Opens the database and returns true if the database already existed.
+	 *
+	 * @throws DataTooNewException if the data uses a newer schema than the
+	 * current code
+	 * @throws DataTooOldException if the data uses an older schema than the
+	 * current code and cannot be migrated
+	 */
+	boolean open(SecretKey key, @Nullable MigrationListener listener)
+			throws DbException;
+
+	/**
+	 * Waits for any open transactions to finish and closes the database.
+	 */
+	void close() throws DbException;
+
+	/**
+	 * Starts a new transaction and returns an object representing it.
+	 * <p/>
+	 * This method acquires locks, so it must not be called while holding a
+	 * lock.
+	 *
+	 * @param readOnly true if the transaction will only be used for reading.
+	 */
+	Transaction startTransaction(boolean readOnly) throws DbException;
+
+	/**
+	 * Commits a transaction to the database.
+	 */
+	void commitTransaction(Transaction txn) throws DbException;
+
+	/**
+	 * Ends a transaction. If the transaction has not been committed,
+	 * it will be aborted. If the transaction has been committed,
+	 * any events attached to the transaction are broadcast.
+	 * The database lock will be released in either case.
+	 */
+	void endTransaction(Transaction txn);
+
+	/**
+	 * Stores a contact associated with the given local and remote pseudonyms,
+	 * and returns an ID for the contact.
+	 */
+	ContactId addContact(Transaction txn, Author remote, AuthorId local,
+			boolean verified, boolean active) throws DbException;
+
+	/**
+	 * Stores a group.
+	 */
+	void addGroup(Transaction txn, Group g) throws DbException;
+
+	/**
+	 * Stores a local pseudonym.
+	 */
+	void addLocalAuthor(Transaction txn, LocalAuthor a) throws DbException;
+
+	/**
+	 * Stores a local message.
+	 */
+	void addLocalMessage(Transaction txn, Message m, Metadata meta,
+			boolean shared) throws DbException;
+
+	/**
+	 * Stores a transport.
+	 */
+	void addTransport(Transaction txn, TransportId t, int maxLatency)
+			throws DbException;
+
+	/**
+	 * Stores the given transport keys for the given contact and returns a
+	 * key set ID.
+	 */
+	KeySetId addTransportKeys(Transaction txn, ContactId c,
+			TransportKeys k) throws DbException;
+
+	/**
+	 * Returns true if the database contains the given contact for the given
+	 * local pseudonym.
+	 */
+	boolean containsContact(Transaction txn, AuthorId remote, AuthorId local)
+			throws DbException;
+
+	/**
+	 * Returns true if the database contains the given group.
+	 */
+	boolean containsGroup(Transaction txn, GroupId g) throws DbException;
+
+	/**
+	 * Returns true if the database contains the given local author.
+	 */
+	boolean containsLocalAuthor(Transaction txn, AuthorId local)
+			throws DbException;
+
+	/**
+	 * Deletes the message with the given ID. Unlike
+	 * {@link #removeMessage(Transaction, MessageId)}, the message ID,
+	 * dependencies, metadata, and any other associated state are not deleted.
+	 */
+	void deleteMessage(Transaction txn, MessageId m) throws DbException;
+
+	/**
+	 * Deletes any metadata associated with the given message.
+	 */
+	void deleteMessageMetadata(Transaction txn, MessageId m) throws DbException;
+
+	/**
+	 * Returns an acknowledgement for the given contact, or null if there are
+	 * no messages to acknowledge.
+	 */
+	@Nullable
+	Ack generateAck(Transaction txn, ContactId c, int maxMessages)
+			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
+	 * 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,
+			int maxLength, int maxLatency) throws DbException;
+
+	/**
+	 * Returns an offer for the given contact for transmission over a
+	 * transport with the given maximum latency, or null if there are no
+	 * messages to offer.
+	 */
+	@Nullable
+	Offer generateOffer(Transaction txn, ContactId c, int maxMessages,
+			int maxLatency) throws DbException;
+
+	/**
+	 * Returns a request for the given contact, or null if there are no
+	 * messages to request.
+	 */
+	@Nullable
+	Request generateRequest(Transaction txn, ContactId c, int maxMessages)
+			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
+	 * 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,
+			int maxLength, int maxLatency) throws DbException;
+
+	/**
+	 * Returns the contact with the given ID.
+	 * <p/>
+	 * Read-only.
+	 */
+	Contact getContact(Transaction txn, ContactId c) throws DbException;
+
+	/**
+	 * Returns all contacts.
+	 * <p/>
+	 * Read-only.
+	 */
+	Collection<Contact> getContacts(Transaction txn) throws DbException;
+
+	/**
+	 * Returns a possibly empty collection of contacts with the given author ID.
+	 * <p/>
+	 * Read-only.
+	 */
+	Collection<Contact> getContactsByAuthorId(Transaction txn, AuthorId remote)
+			throws DbException;
+
+	/**
+	 * Returns all contacts associated with the given local pseudonym.
+	 * <p/>
+	 * Read-only.
+	 */
+	Collection<ContactId> getContacts(Transaction txn, AuthorId a)
+			throws DbException;
+
+	/**
+	 * Returns the group with the given ID.
+	 * <p/>
+	 * Read-only.
+	 */
+	Group getGroup(Transaction txn, GroupId g) throws DbException;
+
+	/**
+	 * Returns the metadata for the given group.
+	 * <p/>
+	 * Read-only.
+	 */
+	Metadata getGroupMetadata(Transaction txn, GroupId g) throws DbException;
+
+	/**
+	 * Returns all groups belonging to the given client.
+	 * <p/>
+	 * Read-only.
+	 */
+	Collection<Group> getGroups(Transaction txn, ClientId c, int majorVersion)
+			throws DbException;
+
+	/**
+	 * Returns the given group's visibility to the given contact, or
+	 * {@link Visibility INVISIBLE} if the group is not in the database.
+	 * <p/>
+	 * Read-only.
+	 */
+	Visibility getGroupVisibility(Transaction txn, ContactId c, GroupId g)
+			throws DbException;
+
+	/**
+	 * Returns the local pseudonym with the given ID.
+	 * <p/>
+	 * Read-only.
+	 */
+	LocalAuthor getLocalAuthor(Transaction txn, AuthorId a) throws DbException;
+
+	/**
+	 * Returns all local pseudonyms.
+	 * <p/>
+	 * Read-only.
+	 */
+	Collection<LocalAuthor> getLocalAuthors(Transaction txn) 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;
+
+	/**
+	 * Returns the IDs of any messages that need to be validated.
+	 * <p/>
+	 * Read-only.
+	 */
+	Collection<MessageId> getMessagesToValidate(Transaction txn)
+			throws DbException;
+
+	/**
+	 * Returns the IDs of any messages that are pending delivery due to
+	 * dependencies on other messages.
+	 * <p/>
+	 * Read-only.
+	 */
+	Collection<MessageId> getPendingMessages(Transaction txn)
+			throws DbException;
+
+	/**
+	 * Returns the IDs of any messages that have shared dependents but have
+	 * not yet been shared themselves.
+	 * <p/>
+	 * Read-only.
+	 */
+	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/>
+	 * Read-only.
+	 */
+	Map<MessageId, Metadata> getMessageMetadata(Transaction txn, GroupId g)
+			throws DbException;
+
+	/**
+	 * Returns the metadata for any delivered messages in the given group with
+	 * metadata that matches all entries in the given query. If the query is
+	 * empty, the metadata for all delivered messages is returned.
+	 * <p/>
+	 * Read-only.
+	 */
+	Map<MessageId, Metadata> getMessageMetadata(Transaction txn, GroupId g,
+			Metadata query) throws DbException;
+
+	/**
+	 * Returns the metadata for the given delivered message.
+	 * <p/>
+	 * Read-only.
+	 */
+	Metadata getMessageMetadata(Transaction txn, MessageId m)
+			throws DbException;
+
+	/**
+	 * Returns the metadata for the given delivered or pending message.
+	 * This is only meant to be used by the ValidationManager.
+	 * <p/>
+	 * Read-only.
+	 */
+	Metadata getMessageMetadataForValidator(Transaction txn, MessageId m)
+			throws DbException;
+
+	/**
+	 * Returns the status of all delivered messages in the given group with
+	 * respect to the given contact.
+	 * <p/>
+	 * Read-only.
+	 */
+	Collection<MessageStatus> getMessageStatus(Transaction txn, ContactId c,
+			GroupId g) throws DbException;
+
+	/**
+	 * Returns the IDs and states of all dependencies of the given message.
+	 * For missing dependencies and dependencies in other groups, the state
+	 * {@link State UNKNOWN} is returned.
+	 * <p/>
+	 * Read-only.
+	 */
+	Map<MessageId, State> getMessageDependencies(Transaction txn, MessageId m)
+			throws DbException;
+
+	/**
+	 * Returns the IDs and states of all dependents of the given message.
+	 * Dependents in other groups are not returned. If the given message is
+	 * missing, no dependents are returned.
+	 * <p/>
+	 * Read-only.
+	 */
+	Map<MessageId, State> getMessageDependents(Transaction txn, MessageId m)
+			throws DbException;
+
+	/**
+	 * Gets the validation and delivery state of the given message.
+	 * <p/>
+	 * Read-only.
+	 */
+	State getMessageState(Transaction txn, MessageId m) throws DbException;
+
+	/**
+	 * Returns the status of the given delivered message with respect to the
+	 * given contact.
+	 * <p/>
+	 * Read-only.
+	 */
+	MessageStatus getMessageStatus(Transaction txn, ContactId c, MessageId m)
+			throws DbException;
+
+	/*
+	 * Returns the next time (in milliseconds since the Unix epoch) when a
+	 * message is due to be sent to the given contact. The returned value may
+	 * be zero if a message is due to be sent immediately, or Long.MAX_VALUE if
+	 * no messages are scheduled to be sent.
+	 * <p/>
+	 * Read-only.
+	 */
+	long getNextSendTime(Transaction txn, ContactId c) throws DbException;
+
+	/**
+	 * Returns all settings in the given namespace.
+	 * <p/>
+	 * Read-only.
+	 */
+	Settings getSettings(Transaction txn, String namespace) throws DbException;
+
+	/**
+	 * Returns all transport keys for the given transport.
+	 * <p/>
+	 * Read-only.
+	 */
+	Collection<KeySet> getTransportKeys(Transaction txn, TransportId t)
+			throws DbException;
+
+	/**
+	 * Increments the outgoing stream counter for the given transport keys.
+	 */
+	void incrementStreamCounter(Transaction txn, TransportId t, KeySetId k)
+			throws DbException;
+
+	/**
+	 * Merges the given metadata with the existing metadata for the given
+	 * group.
+	 */
+	void mergeGroupMetadata(Transaction txn, GroupId g, Metadata meta)
+			throws DbException;
+
+	/**
+	 * Merges the given metadata with the existing metadata for the given
+	 * message.
+	 */
+	void mergeMessageMetadata(Transaction txn, MessageId m, Metadata meta)
+			throws DbException;
+
+	/**
+	 * Merges the given settings with the existing settings in the given
+	 * namespace.
+	 */
+	void mergeSettings(Transaction txn, Settings s, String namespace)
+			throws DbException;
+
+	/**
+	 * Processes an ack from the given contact.
+	 */
+	void receiveAck(Transaction txn, ContactId c, Ack a) throws DbException;
+
+	/**
+	 * Processes a message from the given contact.
+	 */
+	void receiveMessage(Transaction txn, ContactId c, Message m)
+			throws DbException;
+
+	/**
+	 * Processes an offer from the given contact.
+	 */
+	void receiveOffer(Transaction txn, ContactId c, Offer o) throws DbException;
+
+	/**
+	 * Processes a request from the given contact.
+	 */
+	void receiveRequest(Transaction txn, ContactId c, Request r)
+			throws DbException;
+
+	/**
+	 * Removes a contact (and all associated state) from the database.
+	 */
+	void removeContact(Transaction txn, ContactId c) throws DbException;
+
+	/**
+	 * Removes a group (and all associated state) from the database.
+	 */
+	void removeGroup(Transaction txn, Group g) throws DbException;
+
+	/**
+	 * Removes a local pseudonym (and all associated state) from the database.
+	 */
+	void removeLocalAuthor(Transaction txn, AuthorId a) throws DbException;
+
+	/**
+	 * Removes a message (and all associated state) from the database.
+	 */
+	void removeMessage(Transaction txn, MessageId m) throws DbException;
+
+	/**
+	 * Removes a transport (and all associated state) from the database.
+	 */
+	void removeTransport(Transaction txn, TransportId t) throws DbException;
+
+	/**
+	 * Removes the given transport keys from the database.
+	 */
+	void removeTransportKeys(Transaction txn, TransportId t, KeySetId k)
+			throws DbException;
+
+	/**
+	 * Marks the given contact as verified.
+	 */
+	void setContactVerified(Transaction txn, ContactId c) throws DbException;
+
+	/**
+	 * Marks the given contact as active or inactive.
+	 */
+	void setContactActive(Transaction txn, ContactId c, boolean active)
+			throws DbException;
+
+	/**
+	 * Sets the given group's visibility to the given contact.
+	 */
+	void setGroupVisibility(Transaction txn, ContactId c, GroupId g,
+			Visibility v) throws DbException;
+
+	/**
+	 * Marks the given message as shared.
+	 */
+	void setMessageShared(Transaction txn, MessageId m) throws DbException;
+
+	/**
+	 * Sets the validation and delivery state of the given message.
+	 */
+	void setMessageState(Transaction txn, MessageId m, State state)
+			throws DbException;
+
+	/**
+	 * Adds dependencies for a message
+	 */
+	void addMessageDependencies(Transaction txn, Message dependent,
+			Collection<MessageId> dependencies) throws DbException;
+
+	/**
+	 * Sets the reordering window for the given key set and transport in the
+	 * given rotation period.
+	 */
+	void setReorderingWindow(Transaction txn, KeySetId k, TransportId t,
+			long rotationPeriod, long base, byte[] bitmap) throws DbException;
+
+	/**
+	 * Marks the given transport keys as usable for outgoing streams.
+	 */
+	void setTransportKeysActive(Transaction txn, TransportId t, KeySetId k)
+			throws DbException;
+
+	/**
+	 * Stores the given transport keys, deleting any keys they have replaced.
+	 */
+	void updateTransportKeys(Transaction txn, Collection<KeySet> keys)
+			throws DbException;
+}

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

@@ -0,0 +1,15 @@
+package org.briarproject.bramble.api.db;
+
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+import java.io.File;
+
+@NotNullByDefault
+public interface DatabaseConfig {
+
+	File getDatabaseDirectory();
+
+	File getDatabaseKeyDirectory();
+
+	long getMaxSize();
+}