Bump version number for beta release.

Specify 7 characters for Git revision.
(cherry picked from commit f0d8532)
2026-02-14 19:59:05 +01:00 · 2017-12-01 16:30:18 +00:00 · 2017-12-01 16:29:45 +00:00 · 2017-12-01 16:00:53 +00:00 · 2017-12-01 13:47:02 -02:00
580 changed files with 17551 additions and 30439 deletions
--- a/.gitignore
+++ b/.gitignore
@@ -20,7 +20,6 @@ local.properties
 .idea/*
 !.idea/runConfigurations/
 !.idea/codeStyleSettings.xml
 !.idea/codeStyles
 .gradle
 build/
 *.iml
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -8,23 +8,22 @@ cache:
 before_script:
  - set -e
  - export GRADLE_USER_HOME=$PWD/.gradle
  # Accept the license for the Android build tools
  - echo y | /opt/android-sdk/tools/bin/sdkmanager "build-tools;26.0.2"
  # Download OpenJDK 6 so we can compile against its standard library
  - JDK_FILE=openjdk-6-jre-headless_6b38-1.13.10-1~deb7u1_amd64.deb
  - if [ ! -d openjdk ]
  - then
  - wget -q http://ftp.uk.debian.org/debian/pool/main/o/openjdk-6/$JDK_FILE
  - dpkg-deb -x $JDK_FILE openjdk
  - fi
  - export JAVA_6_HOME=$PWD/openjdk/usr/lib/jvm/java-6-openjdk-amd64
 test:
  script:
-    - ./gradlew --no-daemon animalSnifferMain animalSnifferTest
+    - ./gradlew test
    - ./gradlew --no-daemon test
-  after_script:
+after_script:
-    # these file change every time but should not be cached
+    # this file changes 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:
  image: briar/reproducer:latest
  script:
    - cd .. && mv briar /opt/briar-reproducer/
    - cd /opt/briar-reproducer
    - ./reproduce.py ${CI_COMMIT_REF_NAME}
  only:
    - tags
--- a/.idea/codeStyles/Project.xml
+++ b/.idea/codeStyles/Project.xml
@@ -1,261 +0,0 @@
 <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>
--- a/.idea/codeStyles/codeStyleConfig.xml
+++ b/.idea/codeStyles/codeStyleConfig.xml
@@ -1,5 +0,0 @@
 <component name="ProjectCodeStyleConfiguration">
  <state>
    <option name="USE_PER_PROJECT_SETTINGS" value="true" />
  </state>
 </component>
--- a/.idea/runConfigurations/H2_Performance_Test.xml
+++ b/.idea/runConfigurations/H2_Performance_Test.xml
@@ -1,23 +0,0 @@
 <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>
--- a/.idea/runConfigurations/HyperSQL_Performance_Test.xml
+++ b/.idea/runConfigurations/HyperSQL_Performance_Test.xml
@@ -1,23 +0,0 @@
 <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>
--- a/bramble-android/build.gradle
+++ b/bramble-android/build.gradle
@@ -1,21 +1,19 @@
 import de.undercouch.gradle.tasks.download.Download
 import de.undercouch.gradle.tasks.download.Verify
 import java.security.NoSuchAlgorithmException
 apply plugin: 'com.android.library'
 apply plugin: 'witness'
 apply plugin: 'de.undercouch.download'
 android {
 	compileSdkVersion 27
-	buildToolsVersion '27.0.3'
+	buildToolsVersion '26.0.2'
 	defaultConfig {
 		minSdkVersion 14
 		targetSdkVersion 26
-		versionCode 10004
+		versionCode 1613
-		versionName "1.0.4"
+		versionName "0.16.13"
 		consumerProguardFiles 'proguard-rules.txt'
 	}
@@ -36,157 +34,62 @@ dependencies {
 dependencyVerification {
 	verify = [
-			'com.android.tools.analytics-library:protos:26.1.2:protos-26.1.2.jar:52672a0b42b572a06aecc3535d5068eb46c0e15d129b9f1085d3c16a1da5cdbb',
+			'com.google.code.findbugs:jsr305:3.0.2:jsr305-3.0.2.jar:766ad2a0783f2687962c8ad74ceecc38a28b9f72a2d085ee438b7813e928d0c7',
 			'com.android.tools.analytics-library:shared:26.1.2:shared-26.1.2.jar:5c7e0eda18c6f87feeb83628c707e8aaa3298b41fb72e38efe31ad1675f9e8e9',
 			'com.android.tools.analytics-library:tracker:26.1.2:tracker-26.1.2.jar:06f97aa0adf44ffb06f8681c6a79d9be153a08f61d21eddc42b8d3db96df4282',
 			'com.android.tools.build:apksig:3.1.2:apksig-3.1.2.jar:40696a4559124d1d57873d208857eee059d48859239d569c7d18374ac644a8be',
 			'com.android.tools.build:builder-model:3.1.2:builder-model-3.1.2.jar:d49bfa2a135c9562b6ca7aa4342036cfa1582c7074c2d1d93d1dae8b3a134e17',
 			'com.android.tools.build:builder-test-api:3.1.2:builder-test-api-3.1.2.jar:dfe2a50b740d41b11189101062434d4283d18647e89a492ad51710c719363e9f',
 			'com.android.tools.build:builder:3.1.2:builder-3.1.2.jar:b60f825a42e2efe8433619fbc759f3d9effecab718279048d36881188ceb1d14',
 			'com.android.tools.build:gradle-api:3.1.2:gradle-api-3.1.2.jar:e58bcc5b893e4583ab0f5c8ef89c4dbcce202b405a9d7fcc116d21e5357d4893',
 			'com.android.tools.build:manifest-merger:26.1.2:manifest-merger-26.1.2.jar:9c61c27ea5266573107b954acf1216d398f4d7e7ae6fad6409d6b2b767eb091c',
 			'com.android.tools.ddms:ddmlib:26.1.2:ddmlib-26.1.2.jar:18a2a5fbef36882f07d03c2b9e59eba05cf8248177bf5cbff736e4b582804c44',
 			'com.android.tools.external.com-intellij:intellij-core:26.1.2:intellij-core-26.1.2.jar:37c5acf279f1ae3e85b1a5be3c9f15f43bde7b08f978eefefffb9c4035760c52',
 			'com.android.tools.external.com-intellij:kotlin-compiler:26.1.2:kotlin-compiler-26.1.2.jar:152df0bee7580326c77316b669a9d96e3b09efb1d45f545dce4147271b0b8944',
 			'com.android.tools.external.org-jetbrains:uast:26.1.2:uast-26.1.2.jar:02d39582206d3f5fc0a6cb18bfd9e8b9f9c1acb805ec6dac08b4e3a56849d279',
 			'com.android.tools.layoutlib:layoutlib-api:26.1.2:layoutlib-api-26.1.2.jar:20220039fcc7d799f928153beff862e704457c0f55ab44258f3745ebeb662b4f',
 			'com.android.tools.lint:lint-api:26.1.2:lint-api-26.1.2.jar:e1d5b62b870a7c566e9877a6b96b27784a4d713f8caa07fdcb4705d47a40a1d9',
 			'com.android.tools.lint:lint-checks:26.1.2:lint-checks-26.1.2.jar:211e2afd58504372385d71b1e5be982c2b5121ab6fee1c04ddabeb75a8729e07',
 			'com.android.tools.lint:lint-gradle-api:26.1.2:lint-gradle-api-26.1.2.jar:71284f2a8b03c3e55c94511c9eb36f8184fbb85324325fc6b78abf5183f03d90',
 			'com.android.tools.lint:lint-gradle:26.1.2:lint-gradle-26.1.2.jar:855f0c82b7fc690df1b7319c0774f7517f7f8f5dd4eee1f6077dcf50e07c6240',
 			'com.android.tools.lint:lint-kotlin:26.1.2:lint-kotlin-26.1.2.jar:1e591f70bcbbc11569720a9bbcca2bc1f3d4f789f01f40f642848d920643d484',
 			'com.android.tools.lint:lint:26.1.2:lint-26.1.2.jar:93736c62e9f1976998c2b4aa716aea0734cdb162d05502f4af7292654aedb182',
 			'com.android.tools:annotations:26.1.2:annotations-26.1.2.jar:72773dcaf5c4ccca828e3c8467f1b78a8a00b3cc5f8ad1aab88fcf9379928018',
 			'com.android.tools:common:26.1.2:common-26.1.2.jar:ea4320f0c17dcbc4491896bb705c4d25ec08bd62ef02ab0579fe154e75e788e6',
 			'com.android.tools:dvlib:26.1.2:dvlib-26.1.2.jar:1187aa4fb666595c96c4deb6bc0e0f4b7e396bde9f6243330b49a232946130ea',
 			'com.android.tools:repository:26.1.2:repository-26.1.2.jar:8b86e512ad6d32bd76989451eefe2b271f5efce6d4d65ecb173afaf14606e01a',
 			'com.android.tools:sdk-common:26.1.2:sdk-common-26.1.2.jar:23584720a60a21cdcb5b1ec10269e3013789d6805d153cc696c39ec7ce251896',
 			'com.android.tools:sdklib:26.1.2:sdklib-26.1.2.jar:d3870fafc59ab8efa70d3f9649f40ee299c8ec5b58377b06e8853d7272a5bf4e',
 			'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.h2database:h2:1.4.192:h2-1.4.192.jar:225b22e9857235c46c93861410b60b8c81c10dc8985f4faf188985ba5445126c',
-			'com.google.j2objc:j2objc-annotations:1.1:j2objc-annotations-1.1.jar:40ceb7157feb263949e0f503fe5f71689333a621021aa20ce0d0acee3badaa0f',
+			'com.madgag.spongycastle:core:1.58.0.0:core-1.58.0.0.jar:199617dd5698c5a9312b898c0a4cec7ce9dd8649d07f65d91629f58229d72728',
 			'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',
+			'org.bitlet:weupnp:0.1.4:weupnp-0.1.4.jar:88df7e6504929d00bdb832863761385c68ab92af945b04f0770b126270a444fb',
-			'net.sf.jopt-simple:jopt-simple:4.9:jopt-simple-4.9.jar:26c5856e954b5f864db76f13b86919b59c6eecf9fd930b96baa8884626baf2f5',
+			'org.jacoco:org.jacoco.agent:0.7.4.201502262128:org.jacoco.agent-0.7.4.201502262128-runtime.jar:e357a0f1d573c2f702a273992b1b6cb661734f66311854efb3778a888515c5b5',
-			'net.sf.kxml:kxml2:2.3.0:kxml2-2.3.0.jar:f264dd9f79a1fde10ce5ecc53221eff24be4c9331c830b7d52f2f08a7b633de2',
+			'org.jacoco:org.jacoco.agent:0.7.4.201502262128:org.jacoco.agent-0.7.4.201502262128.jar:47b4bec6df11a1118da3953da8b9fa1e7079d6fec857faa1a3cf912e53a6fd4e',
-			'org.apache.commons:commons-compress:1.12:commons-compress-1.12.jar:2c1542faf343185b7cab9c3d55c8ae5471d6d095d3887a4adefdbdf2984dc0b6',
+			'org.jacoco:org.jacoco.ant:0.7.4.201502262128:org.jacoco.ant-0.7.4.201502262128.jar:013ce2a68ba57a3c59215ae0dec4df3498c078062a38c3b94c841fc14450f283',
-			'org.apache.httpcomponents:httpclient:4.2.6:httpclient-4.2.6.jar:362e9324ee7c697e21279e20077b52737ddef3f1b2c1a7abe5ad34b465145550',
+			'org.jacoco:org.jacoco.core:0.7.4.201502262128:org.jacoco.core-0.7.4.201502262128.jar:ec4c74554312fac5116350164786f91b35c9e082fa4ea598bfa42b5db05d7abb',
-			'org.apache.httpcomponents:httpcore:4.2.5:httpcore-4.2.5.jar:e5e82da4cc66c8d917bbf743e3c0752efe8522735e7fc9dbddb65bccea81cfe9',
+			'org.jacoco:org.jacoco.report:0.7.4.201502262128:org.jacoco.report-0.7.4.201502262128.jar:7a3554c605e088e7e323b1084656243f0444fa353e2f2dee1f1a4204eb64ff09',
-			'org.apache.httpcomponents:httpmime:4.1:httpmime-4.1.jar:31629566148e8a47688ae43b420abc3ecd783ed15b33bebc00824bf24c9b15aa',
+			'org.ow2.asm:asm-debug-all:5.0.1:asm-debug-all-5.0.1.jar:4734de5b515a454b0096db6971fb068e5f70e6f10bbee2b3bd2fdfe5d978ed57',
 			'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.codehaus.groovy:groovy-all:2.4.12:groovy-all-2.4.12.jar:6a56af4bd48903d56bec62821876cadefafd007360cc6bd0d8f7aa8d72b38be4',
 			'org.codehaus.mojo:animal-sniffer-annotations:1.14:animal-sniffer-annotations-1.14.jar:2068320bd6bad744c3673ab048f67e30bef8f518996fa380033556600669905d',
 			'org.glassfish.jaxb:jaxb-core:2.2.11:jaxb-core-2.2.11.jar:37bcaee8ebb04362c8352a5bf6221b86967ecdab5164c696b10b9a2bb587b2aa',
 			'org.glassfish.jaxb:jaxb-runtime:2.2.11:jaxb-runtime-2.2.11.jar:a874f2351cfba8e2946be3002d10c18a6da8f21b52ba2acf52f2b85d5520ed70',
 			'org.glassfish.jaxb:txw2:2.2.11:txw2-2.2.11.jar:272a3ccad45a4511351920cd2a8633c53cab8d5220c7a92954da5526bb5eafea',
 			'org.jetbrains.kotlin:kotlin-reflect:1.2.0:kotlin-reflect-1.2.0.jar:4f48a872bad6e4d9c053f4ad610d11e4012ad7e58dc19a03dd5eb811f36069dd',
 			'org.jetbrains.kotlin:kotlin-stdlib-jre7:1.2.0:kotlin-stdlib-jre7-1.2.0.jar:c7a20fb951d437797afe8980aff6c1e5a03f310c661ba58ba1d4fa90cb0f2926',
 			'org.jetbrains.kotlin:kotlin-stdlib-jre8:1.2.0:kotlin-stdlib-jre8-1.2.0.jar:633524eee6ef1941f7cb1dab7ee3927b0a221ceee9047aeb5515f4cbb990c82a',
 			'org.jetbrains.kotlin:kotlin-stdlib:1.2.0:kotlin-stdlib-1.2.0.jar:05cfd9f5ac0b41910703a8925f7211a495909b27a2ffdd1c5106f1689aeafcd4',
 			'org.jetbrains.trove4j:trove4j:20160824:trove4j-20160824.jar:1917871c8deb468307a584680c87a44572f5a8b0b98c6d397fc0f5f86596dbe7',
 			'org.jetbrains:annotations:13.0:annotations-13.0.jar:ace2a10dc8e2d5fd34925ecac03e4988b2c0f851650c94b8cef49ba1bd111478',
 			'org.jvnet.staxex:stax-ex:1.7.7:stax-ex-1.7.7.jar:a31ff7d77163c0deb09e7fee59ad35ae44c2cee2cc8552a116ccd1583d813fb4',
 			'org.ow2.asm:asm-analysis:5.1:asm-analysis-5.1.jar:a34658f5c5de4b573eef21131cc32cc25f7b66407944f312b28ec2e56abb1fa9',
 			'org.ow2.asm:asm-commons:5.1:asm-commons-5.1.jar:97b3786e1f55e74bddf8ad102bf50e33bbcbc1f6b7fd7b36f0bbbb25cd4981be',
 			'org.ow2.asm:asm-tree:5.1:asm-tree-5.1.jar:c0de2bbc4cb8297419659813ecd4ed1d077ed1dd5c1f5544cc5143e493e84c10',
 			'org.ow2.asm:asm-util:5.1:asm-util-5.1.jar:ee032c39ae5e3cd099148fbba9a2124f9ed613e5cb93e03ee0fa8808ce364040',
 			'org.ow2.asm:asm:5.1:asm-5.1.jar:d2da399a9967c69f0a21739256fa79d284222c223082cacadc17372244764b54',
 	]
 }
 ext.torBinaryDir = 'src/main/res/raw'
-ext.torVersion = '0.2.9.14'
+ext.torVersion = '0.2.9.12'
-ext.geoipVersion = '2017-11-06'
+ext.geoipVersion = '2017-09-06'
 ext.torDownloadUrl = 'https://briarproject.org/build/'
 def torBinaries = [
-		"tor_arm"    : '1710ea6c47b7f4c1a88bdf4858c7893837635db10e8866854eed8d61629f50e8',
+		"tor_arm"    : '8ed0b347ffed1d6a4d2fd14495118eb92be83e9cc06e057e15220dc288b31688',
-		"tor_arm_pie": '974e6949507db8fa2ea45231817c2c3677ed4ccf5488a2252317d744b0be1917',
+		"tor_arm_pie": '64403262511c29f462ca5e7c7621bfc3c944898364d1d5ad35a016bb8a034283',
-		"tor_x86"    : '3a5e45b3f051fcda9353b098b7086e762ffe7ba9242f7d7c8bf6523faaa8b1e9',
+		"tor_x86"    : '61e014607a2079bcf1646289c67bff6372b1aded6e1d8d83d7791efda9a4d5ab',
-		"tor_x86_pie": 'd1d96d8ce1a4b68accf04850185780d10cd5563d3552f7e1f040f8ca32cb4e51',
+		"tor_x86_pie": '18fbc98356697dd0895836ab46d5c9877d1c539193464f7db1e82a65adaaf288',
-		"geoip"      : '8239b98374493529a29096e45fc5877d4d6fdad0146ad8380b291f90d61484ea'
+		"geoip"      : 'fe49d3adb86d3c512373101422a017dbb86c85a570524663f09dd8ce143a24f3'
 ]
-def verifyOrDeleteBinary(name, chksum, alreadyVerified) {
+def downloadBinary(name) {
-	return tasks.create("verifyOrDeleteBinary${name}", VerifyOrDelete) {
+	return tasks.create("downloadBinary${name}", Download) {
 		src "${torBinaryDir}/${name}.zip"
 		algorithm 'SHA-256'
 		checksum chksum
 		result alreadyVerified
 		onlyIf {
 			src.exists()
 		}
 	}
 }
 def downloadBinary(name, chksum, alreadyVerified) {
 	return tasks.create([
 			name: "downloadBinary${name}",
 			type: Download,
 			dependsOn: verifyOrDeleteBinary(name, chksum, alreadyVerified)]) {
 		src "${torDownloadUrl}${name}.zip"
 				.replace('tor_', "tor-${torVersion}-")
 				.replace('geoip', "geoip-${geoipVersion}")
 				.replaceAll('_', '-')
 		dest "${torBinaryDir}/${name}.zip"
-		onlyIf {
+		onlyIfNewer true
 			!dest.exists()
 		}
 	}
 }
 def verifyBinary(name, chksum) {
 	boolean[] alreadyVerified = [false]
 	return tasks.create([
 			name     : "verifyBinary${name}",
 			type     : Verify,
-			dependsOn: downloadBinary(name, chksum, alreadyVerified)]) {
+			dependsOn: downloadBinary(name)]) {
 		src "${torBinaryDir}/${name}.zip"
 		algorithm 'SHA-256'
 		checksum chksum
 		onlyIf {
 			!alreadyVerified[0]
 		}
 	}
 }
 project.afterEvaluate {
-	torBinaries.every { name, checksum ->
+	torBinaries.every { key, value ->
-		preBuild.dependsOn.add(verifyBinary(name, checksum))
+		preBuild.dependsOn.add(verifyBinary(key, value))
 	}
 }
 class VerifyOrDelete extends Verify {
 	boolean[] result
 	@TaskAction
 	@Override
 	void verify() throws IOException, NoSuchAlgorithmException {
 		try {
 			super.verify()
 			result[0] = true
 		} catch (Exception e) {
 			println "${src} failed verification - deleting"
 			src.delete()
 		}
 	}
 }
--- a/bramble-android/proguard-rules.txt
+++ b/bramble-android/proguard-rules.txt
@@ -8,10 +8,6 @@
 -dontwarn dagger.**
 -dontnote dagger.**
 -keep class net.i2p.crypto.eddsa.** { *; }
 -keep class org.whispersystems.curve25519.** { *; }
 -dontwarn sun.misc.Unsafe
 -dontnote com.google.common.**
--- a/bramble-android/src/main/java/org/briarproject/bramble/plugin/AndroidPluginModule.java
+++ b/bramble-android/src/main/java/org/briarproject/bramble/plugin/AndroidPluginModule.java
@@ -10,10 +10,10 @@ import org.briarproject.bramble.api.plugin.BackoffFactory;
 import org.briarproject.bramble.api.plugin.PluginConfig;
 import org.briarproject.bramble.api.plugin.duplex.DuplexPluginFactory;
 import org.briarproject.bramble.api.plugin.simplex.SimplexPluginFactory;
 import org.briarproject.bramble.api.reporting.DevReporter;
 import org.briarproject.bramble.api.system.AndroidExecutor;
 import org.briarproject.bramble.api.system.LocationUtils;
-import org.briarproject.bramble.api.system.Scheduler;
+import org.briarproject.bramble.plugin.droidtooth.DroidtoothPluginFactory;
 import org.briarproject.bramble.plugin.bluetooth.AndroidBluetoothPluginFactory;
 import org.briarproject.bramble.plugin.tcp.AndroidLanTcpPluginFactory;
 import org.briarproject.bramble.plugin.tor.TorPluginFactory;
@@ -22,7 +22,6 @@ import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.concurrent.Executor;
 import java.util.concurrent.ScheduledExecutorService;
 import javax.net.SocketFactory;
@@ -34,19 +33,18 @@ public class AndroidPluginModule {
 	@Provides
 	PluginConfig providePluginConfig(@IoExecutor Executor ioExecutor,
 			@Scheduler ScheduledExecutorService scheduler,
 			AndroidExecutor androidExecutor, SecureRandom random,
 			SocketFactory torSocketFactory, BackoffFactory backoffFactory,
-			Application app, LocationUtils locationUtils, EventBus eventBus) {
+			Application app, LocationUtils locationUtils, DevReporter reporter,
 			EventBus eventBus) {
 		Context appContext = app.getApplicationContext();
-		DuplexPluginFactory bluetooth =
+		DuplexPluginFactory bluetooth = new DroidtoothPluginFactory(ioExecutor,
-				new AndroidBluetoothPluginFactory(ioExecutor, androidExecutor,
+				androidExecutor, appContext, random, eventBus, backoffFactory);
-						appContext, random, eventBus, backoffFactory);
+		DuplexPluginFactory tor = new TorPluginFactory(ioExecutor, appContext,
-		DuplexPluginFactory tor = new TorPluginFactory(ioExecutor, scheduler,
+				locationUtils, reporter, eventBus, torSocketFactory,
 				appContext, locationUtils, eventBus, torSocketFactory,
 				backoffFactory);
 		DuplexPluginFactory lan = new AndroidLanTcpPluginFactory(ioExecutor,
-				scheduler, backoffFactory, appContext);
+				backoffFactory, appContext);
 		Collection<DuplexPluginFactory> duplex =
 				Arrays.asList(bluetooth, tor, lan);
 		@NotNullByDefault
--- a/bramble-android/src/main/java/org/briarproject/bramble/plugin/bluetooth/AndroidBluetoothPlugin.java
+++ b/bramble-android/src/main/java/org/briarproject/bramble/plugin/bluetooth/AndroidBluetoothPlugin.java
@@ -1,209 +0,0 @@
 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;
@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) {
 			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), 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) {
 			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), 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");
 			}
 		}
 	}
 }
--- a/bramble-android/src/main/java/org/briarproject/bramble/plugin/droidtooth/DroidtoothPlugin.java
+++ b/bramble-android/src/main/java/org/briarproject/bramble/plugin/droidtooth/DroidtoothPlugin.java
@@ -0,0 +1,490 @@
 package org.briarproject.bramble.plugin.droidtooth;
 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.FormatException;
 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.KeyAgreementConnection;
 import org.briarproject.bramble.api.keyagreement.KeyAgreementListener;
 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.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.plugin.event.DisableBluetoothEvent;
 import org.briarproject.bramble.api.plugin.event.EnableBluetoothEvent;
 import org.briarproject.bramble.api.properties.TransportProperties;
 import org.briarproject.bramble.api.system.AndroidExecutor;
 import org.briarproject.bramble.util.AndroidUtils;
 import org.briarproject.bramble.util.StringUtils;
 import java.io.Closeable;
 import java.io.IOException;
 import java.security.SecureRandom;
 import java.util.Collection;
 import java.util.Map;
 import java.util.Map.Entry;
 import java.util.UUID;
 import java.util.concurrent.Callable;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.Executor;
 import java.util.concurrent.atomic.AtomicBoolean;
 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.INFO;
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.api.keyagreement.KeyAgreementConstants.TRANSPORT_ID_BLUETOOTH;
 import static org.briarproject.bramble.api.plugin.BluetoothConstants.ID;
 import static org.briarproject.bramble.api.plugin.BluetoothConstants.PREF_BT_ENABLE;
 import static org.briarproject.bramble.api.plugin.BluetoothConstants.PROP_ADDRESS;
 import static org.briarproject.bramble.api.plugin.BluetoothConstants.PROP_UUID;
 import static org.briarproject.bramble.api.plugin.BluetoothConstants.UUID_BYTES;
 import static org.briarproject.bramble.util.PrivacyUtils.scrubMacAddress;
@MethodsNotNullByDefault
@ParametersNotNullByDefault
 class DroidtoothPlugin implements DuplexPlugin, EventListener {
 	private static final Logger LOG =
 			Logger.getLogger(DroidtoothPlugin.class.getName());
 	private final Executor ioExecutor;
 	private final AndroidExecutor androidExecutor;
 	private final Context appContext;
 	private final SecureRandom secureRandom;
 	private final Backoff backoff;
 	private final DuplexPluginCallback callback;
 	private final int maxLatency;
 	private final AtomicBoolean used = new AtomicBoolean(false);
 	private volatile boolean running = false;
 	private volatile boolean wasEnabledByUs = false;
 	private volatile BluetoothStateReceiver receiver = null;
 	private volatile BluetoothServerSocket socket = null;
 	// Non-null if the plugin started successfully
 	private volatile BluetoothAdapter adapter = null;
 	DroidtoothPlugin(Executor ioExecutor, AndroidExecutor androidExecutor,
 			Context appContext, SecureRandom secureRandom, Backoff backoff,
 			DuplexPluginCallback callback, int maxLatency) {
 		this.ioExecutor = ioExecutor;
 		this.androidExecutor = androidExecutor;
 		this.appContext = appContext;
 		this.secureRandom = secureRandom;
 		this.backoff = backoff;
 		this.callback = callback;
 		this.maxLatency = maxLatency;
 	}
 	@Override
 	public TransportId getId() {
 		return ID;
 	}
 	@Override
 	public int getMaxLatency() {
 		return maxLatency;
 	}
 	@Override
 	public int getMaxIdleTime() {
 		// Bluetooth detects dead connections so we don't need keepalives
 		return Integer.MAX_VALUE;
 	}
 	@Override
 	public void start() throws PluginException {
 		if (used.getAndSet(true)) throw new IllegalStateException();
 		// 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 e) {
 			Thread.currentThread().interrupt();
 			LOG.warning("Interrupted while getting BluetoothAdapter");
 			throw new PluginException(e);
 		} catch (ExecutionException e) {
 			throw new PluginException(e);
 		}
 		if (adapter == null) {
 			LOG.info("Bluetooth is not supported");
 			throw new PluginException();
 		}
 		running = true;
 		// 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);
 		// If Bluetooth is enabled, bind a socket
 		if (adapter.isEnabled()) {
 			bind();
 		} else {
 			// Enable Bluetooth if settings allow
 			if (callback.getSettings().getBoolean(PREF_BT_ENABLE, false)) {
 				enableAdapter();
 			} else {
 				LOG.info("Not enabling Bluetooth");
 			}
 		}
 	}
 	private void bind() {
 		ioExecutor.execute(() -> {
 			if (!isRunning()) return;
 			String address = AndroidUtils.getBluetoothAddress(appContext,
 					adapter);
 			if (LOG.isLoggable(INFO))
 				LOG.info("Local address " + scrubMacAddress(address));
 			if (!StringUtils.isNullOrEmpty(address)) {
 				// Advertise the Bluetooth address to contacts
 				TransportProperties p = new TransportProperties();
 				p.put(PROP_ADDRESS, address);
 				callback.mergeLocalProperties(p);
 			}
 			// Bind a server socket to accept connections from contacts
 			BluetoothServerSocket ss;
 			try {
 				ss = adapter.listenUsingInsecureRfcommWithServiceRecord(
 						"RFCOMM", getUuid());
 			} catch (IOException e) {
 				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 				return;
 			}
 			if (!isRunning()) {
 				tryToClose(ss);
 				return;
 			}
 			LOG.info("Socket bound");
 			socket = ss;
 			backoff.reset();
 			callback.transportEnabled();
 			acceptContactConnections();
 		});
 	}
 	private UUID getUuid() {
 		String uuid = callback.getLocalProperties().get(PROP_UUID);
 		if (uuid == null) {
 			byte[] random = new byte[UUID_BYTES];
 			secureRandom.nextBytes(random);
 			uuid = UUID.nameUUIDFromBytes(random).toString();
 			TransportProperties p = new TransportProperties();
 			p.put(PROP_UUID, uuid);
 			callback.mergeLocalProperties(p);
 		}
 		return UUID.fromString(uuid);
 	}
 	private void tryToClose(@Nullable BluetoothServerSocket ss) {
 		try {
 			if (ss != null) ss.close();
 		} catch (IOException e) {
 			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 		} finally {
 			callback.transportDisabled();
 		}
 	}
 	private void acceptContactConnections() {
 		while (isRunning()) {
 			BluetoothSocket s;
 			try {
 				s = socket.accept();
 			} catch (IOException e) {
 				// This is expected when the socket is closed
 				if (LOG.isLoggable(INFO)) LOG.info(e.toString());
 				return;
 			}
 			if (LOG.isLoggable(INFO)) {
 				String address = s.getRemoteDevice().getAddress();
 				LOG.info("Connection from " + scrubMacAddress(address));
 			}
 			backoff.reset();
 			callback.incomingConnectionCreated(wrapSocket(s));
 		}
 	}
 	private DuplexTransportConnection wrapSocket(BluetoothSocket s) {
 		return new DroidtoothTransportConnection(this, s);
 	}
 	private void enableAdapter() {
 		if (adapter != null && !adapter.isEnabled()) {
 			if (adapter.enable()) {
 				LOG.info("Enabling Bluetooth");
 				wasEnabledByUs = true;
 			} else {
 				LOG.info("Could not enable Bluetooth");
 			}
 		}
 	}
 	@Override
 	public void stop() {
 		running = false;
 		if (receiver != null) appContext.unregisterReceiver(receiver);
 		tryToClose(socket);
 		disableAdapter();
 	}
 	private void disableAdapter() {
 		if (adapter != null && adapter.isEnabled() && wasEnabledByUs) {
 			if (adapter.disable()) LOG.info("Disabling Bluetooth");
 			else LOG.info("Could not disable Bluetooth");
 		}
 	}
 	@Override
 	public boolean isRunning() {
 		return running && adapter != null && adapter.isEnabled();
 	}
 	@Override
 	public boolean shouldPoll() {
 		return true;
 	}
 	@Override
 	public int getPollingInterval() {
 		return backoff.getPollingInterval();
 	}
 	@Override
 	public void poll(Collection<ContactId> connected) {
 		if (!isRunning()) return;
 		backoff.increment();
 		// Try to connect to known devices in parallel
 		Map<ContactId, TransportProperties> remote =
 				callback.getRemoteProperties();
 		for (Entry<ContactId, TransportProperties> e : remote.entrySet()) {
 			ContactId c = e.getKey();
 			if (connected.contains(c)) continue;
 			String address = e.getValue().get(PROP_ADDRESS);
 			if (StringUtils.isNullOrEmpty(address)) continue;
 			String uuid = e.getValue().get(PROP_UUID);
 			if (StringUtils.isNullOrEmpty(uuid)) continue;
 			ioExecutor.execute(() -> {
 				if (!running) return;
 				BluetoothSocket s = connect(address, uuid);
 				if (s != null) {
 					backoff.reset();
 					callback.outgoingConnectionCreated(c, wrapSocket(s));
 				}
 			});
 		}
 	}
 	@Nullable
 	private BluetoothSocket connect(String address, String uuid) {
 		// Validate the address
 		if (!BluetoothAdapter.checkBluetoothAddress(address)) {
 			if (LOG.isLoggable(WARNING))
 				// not scrubbing here to be able to figure out the problem
 				LOG.warning("Invalid address " + address);
 			return null;
 		}
 		// Validate the UUID
 		UUID u;
 		try {
 			u = UUID.fromString(uuid);
 		} catch (IllegalArgumentException e) {
 			if (LOG.isLoggable(WARNING)) LOG.warning("Invalid UUID " + uuid);
 			return null;
 		}
 		// Try to connect
 		BluetoothDevice d = adapter.getRemoteDevice(address);
 		BluetoothSocket s = null;
 		try {
 			s = d.createInsecureRfcommSocketToServiceRecord(u);
 			if (LOG.isLoggable(INFO))
 				LOG.info("Connecting to " + scrubMacAddress(address));
 			s.connect();
 			if (LOG.isLoggable(INFO))
 				LOG.info("Connected to " + scrubMacAddress(address));
 			return s;
 		} catch (IOException e) {
 			if (LOG.isLoggable(INFO)) {
 				LOG.info("Failed to connect to " + scrubMacAddress(address)
 						+ ": " + e);
 			}
 			tryToClose(s);
 			return null;
 		}
 	}
 	private void tryToClose(@Nullable Closeable c) {
 		try {
 			if (c != null) c.close();
 		} catch (IOException e) {
 			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 		}
 	}
 	@Override
 	public DuplexTransportConnection createConnection(ContactId c) {
 		if (!isRunning()) return null;
 		TransportProperties p = callback.getRemoteProperties(c);
 		String address = p.get(PROP_ADDRESS);
 		if (StringUtils.isNullOrEmpty(address)) return null;
 		String uuid = p.get(PROP_UUID);
 		if (StringUtils.isNullOrEmpty(uuid)) return null;
 		BluetoothSocket s = connect(address, uuid);
 		if (s == null) return null;
 		return new DroidtoothTransportConnection(this, s);
 	}
 	@Override
 	public boolean supportsKeyAgreement() {
 		return true;
 	}
 	@Override
 	public KeyAgreementListener createKeyAgreementListener(byte[] commitment) {
 		if (!isRunning()) return null;
 		// There's no point listening if we can't discover our own address
 		String address = AndroidUtils.getBluetoothAddress(appContext, adapter);
 		if (address.isEmpty()) return null;
 		// No truncation necessary because COMMIT_LENGTH = 16
 		UUID uuid = UUID.nameUUIDFromBytes(commitment);
 		if (LOG.isLoggable(INFO)) LOG.info("Key agreement UUID " + uuid);
 		// Bind a server socket for receiving key agreement connections
 		BluetoothServerSocket ss;
 		try {
 			ss = adapter.listenUsingInsecureRfcommWithServiceRecord(
 					"RFCOMM", uuid);
 		} catch (IOException e) {
 			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 			return null;
 		}
 		BdfList descriptor = new BdfList();
 		descriptor.add(TRANSPORT_ID_BLUETOOTH);
 		descriptor.add(StringUtils.macToBytes(address));
 		return new BluetoothKeyAgreementListener(descriptor, ss);
 	}
 	@Override
 	public DuplexTransportConnection createKeyAgreementConnection(
 			byte[] commitment, BdfList descriptor, long timeout) {
 		if (!isRunning()) return null;
 		String address;
 		try {
 			address = parseAddress(descriptor);
 		} catch (FormatException e) {
 			LOG.info("Invalid address in key agreement descriptor");
 			return null;
 		}
 		// No truncation necessary because COMMIT_LENGTH = 16
 		UUID uuid = UUID.nameUUIDFromBytes(commitment);
 		if (LOG.isLoggable(INFO))
 			LOG.info("Connecting to key agreement UUID " + uuid);
 		BluetoothSocket s = connect(address, uuid.toString());
 		if (s == null) return null;
 		return new DroidtoothTransportConnection(this, s);
 	}
 	private String parseAddress(BdfList descriptor) throws FormatException {
 		byte[] mac = descriptor.getRaw(1);
 		if (mac.length != 6) throw new FormatException();
 		return StringUtils.macToString(mac);
 	}
 	@Override
 	public void eventOccurred(Event e) {
 		if (e instanceof EnableBluetoothEvent) {
 			enableAdapterAsync();
 		} else if (e instanceof DisableBluetoothEvent) {
 			disableAdapterAsync();
 		}
 	}
 	private void enableAdapterAsync() {
 		ioExecutor.execute(this::enableAdapter);
 	}
 	private void disableAdapterAsync() {
 		ioExecutor.execute(this::disableAdapter);
 	}
 	private class BluetoothStateReceiver extends BroadcastReceiver {
 		@Override
 		public void onReceive(Context ctx, Intent intent) {
 			int state = intent.getIntExtra(EXTRA_STATE, 0);
 			if (state == STATE_ON) {
 				LOG.info("Bluetooth enabled");
 				bind();
 			} else if (state == STATE_OFF) {
 				LOG.info("Bluetooth disabled");
 				tryToClose(socket);
 			}
 			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");
 			}
 		}
 	}
 	private class BluetoothKeyAgreementListener extends KeyAgreementListener {
 		private final BluetoothServerSocket ss;
 		private BluetoothKeyAgreementListener(BdfList descriptor,
 				BluetoothServerSocket ss) {
 			super(descriptor);
 			this.ss = ss;
 		}
 		@Override
 		public Callable<KeyAgreementConnection> listen() {
 			return () -> {
 				BluetoothSocket s = ss.accept();
 				if (LOG.isLoggable(INFO))
 					LOG.info(ID.getString() + ": Incoming connection");
 				return new KeyAgreementConnection(
 						new DroidtoothTransportConnection(
 								DroidtoothPlugin.this, s), ID);
 			};
 		}
 		@Override
 		public void close() {
 			try {
 				ss.close();
 			} catch (IOException e) {
 				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 			}
 		}
 	}
 }
--- a/bramble-android/src/main/java/org/briarproject/bramble/plugin/bluetooth/AndroidBluetoothPluginFactory.java
+++ b/bramble-android/src/main/java/org/briarproject/bramble/plugin/bluetooth/AndroidBluetoothPluginFactory.java
@@ -1,4 +1,4 @@
-package org.briarproject.bramble.plugin.bluetooth;
+package org.briarproject.bramble.plugin.droidtooth;
 import android.content.Context;
@@ -21,7 +21,7 @@ import static org.briarproject.bramble.api.plugin.BluetoothConstants.ID;
@Immutable
@NotNullByDefault
-public class AndroidBluetoothPluginFactory implements DuplexPluginFactory {
+public class DroidtoothPluginFactory implements DuplexPluginFactory {
 	private static final int MAX_LATENCY = 30 * 1000; // 30 seconds
 	private static final int MIN_POLLING_INTERVAL = 60 * 1000; // 1 minute
@@ -35,7 +35,7 @@ public class AndroidBluetoothPluginFactory implements DuplexPluginFactory {
 	private final EventBus eventBus;
 	private final BackoffFactory backoffFactory;
-	public AndroidBluetoothPluginFactory(Executor ioExecutor,
+	public DroidtoothPluginFactory(Executor ioExecutor,
 			AndroidExecutor androidExecutor, Context appContext,
 			SecureRandom secureRandom, EventBus eventBus,
 			BackoffFactory backoffFactory) {
@@ -59,13 +59,11 @@ public class AndroidBluetoothPluginFactory implements DuplexPluginFactory {
 	@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(
+		DroidtoothPlugin plugin = new DroidtoothPlugin(ioExecutor,
-				connectionLimiter, ioExecutor, androidExecutor, appContext,
+				androidExecutor, appContext, secureRandom, backoff, callback,
-				secureRandom, backoff, callback, MAX_LATENCY);
+				MAX_LATENCY);
 		eventBus.addListener(plugin);
 		return plugin;
 	}
--- a/bramble-android/src/main/java/org/briarproject/bramble/plugin/bluetooth/AndroidBluetoothTransportConnection.java
+++ b/bramble-android/src/main/java/org/briarproject/bramble/plugin/bluetooth/AndroidBluetoothTransportConnection.java
@@ -1,4 +1,4 @@
-package org.briarproject.bramble.plugin.bluetooth;
+package org.briarproject.bramble.plugin.droidtooth;
 import android.bluetooth.BluetoothSocket;
@@ -11,17 +11,12 @@ import java.io.InputStream;
 import java.io.OutputStream;
@NotNullByDefault
-class AndroidBluetoothTransportConnection
+class DroidtoothTransportConnection extends AbstractDuplexTransportConnection {
 		extends AbstractDuplexTransportConnection {
 	private final BluetoothConnectionLimiter connectionManager;
 	private final BluetoothSocket socket;
-	AndroidBluetoothTransportConnection(Plugin plugin,
+	DroidtoothTransportConnection(Plugin plugin, BluetoothSocket socket) {
 			BluetoothConnectionLimiter connectionManager,
 			BluetoothSocket socket) {
 		super(plugin);
 		this.connectionManager = connectionManager;
 		this.socket = socket;
 	}
@@ -37,10 +32,6 @@ class AndroidBluetoothTransportConnection
 	@Override
 	protected void closeConnection(boolean exception) throws IOException {
-		try {
+		socket.close();
 			socket.close();
 		} finally {
 			connectionManager.connectionClosed(this);
 		}
 	}
 }
--- a/bramble-android/src/main/java/org/briarproject/bramble/plugin/tcp/AndroidLanTcpPlugin.java
+++ b/bramble-android/src/main/java/org/briarproject/bramble/plugin/tcp/AndroidLanTcpPlugin.java
@@ -5,84 +5,37 @@ import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.net.ConnectivityManager;
 import android.net.Network;
 import android.net.NetworkInfo;
 import android.net.wifi.WifiInfo;
 import android.net.wifi.WifiManager;
 import org.briarproject.bramble.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.concurrent.ScheduledExecutorService;
 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.CONNECTIVITY_ACTION;
 import static android.net.ConnectivityManager.TYPE_WIFI;
 import static android.net.wifi.WifiManager.EXTRA_WIFI_STATE;
 import static android.os.Build.VERSION.SDK_INT;
 import static java.util.Collections.emptyList;
 import static java.util.Collections.singletonList;
 import static java.util.concurrent.TimeUnit.SECONDS;
@NotNullByDefault
 class AndroidLanTcpPlugin extends LanTcpPlugin {
 	// See android.net.wifi.WifiManager
 	private static final String WIFI_AP_STATE_CHANGED_ACTION =
 			"android.net.wifi.WIFI_AP_STATE_CHANGED";
 	private static final int WIFI_AP_STATE_ENABLED = 13;
 	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 ScheduledExecutorService scheduler;
 	private final Context appContext;
 	private final ConnectivityManager connectivityManager;
 	@Nullable
 	private final WifiManager wifiManager;
 	@Nullable
 	private volatile BroadcastReceiver networkStateReceiver = null;
 	private volatile SocketFactory socketFactory;
-	AndroidLanTcpPlugin(Executor ioExecutor, ScheduledExecutorService scheduler,
+	AndroidLanTcpPlugin(Executor ioExecutor, Backoff backoff,
-			Backoff backoff, Context appContext, DuplexPluginCallback callback,
+			Context appContext, DuplexPluginCallback callback, int maxLatency,
-			int maxLatency, int maxIdleTime) {
+			int maxIdleTime) {
 		super(ioExecutor, backoff, callback, maxLatency, maxIdleTime);
 		this.scheduler = scheduler;
 		this.appContext = appContext;
 		ConnectivityManager connectivityManager = (ConnectivityManager)
 				appContext.getSystemService(CONNECTIVITY_SERVICE);
 		if (connectivityManager == null) throw new AssertionError();
 		this.connectivityManager = connectivityManager;
 		wifiManager = (WifiManager) appContext.getApplicationContext()
 				.getSystemService(WIFI_SERVICE);
 		socketFactory = SocketFactory.getDefault();
 	}
 	@Override
@@ -91,9 +44,7 @@ class AndroidLanTcpPlugin extends LanTcpPlugin {
 		running = true;
 		// Register to receive network status events
 		networkStateReceiver = new NetworkStateReceiver();
-		IntentFilter filter = new IntentFilter();
+		IntentFilter filter = new IntentFilter(CONNECTIVITY_ACTION);
 		filter.addAction(CONNECTIVITY_ACTION);
 		filter.addAction(WIFI_AP_STATE_CHANGED_ACTION);
 		appContext.registerReceiver(networkStateReceiver, filter);
 	}
@@ -105,92 +56,21 @@ class AndroidLanTcpPlugin extends LanTcpPlugin {
 		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();
 	}
 	private class NetworkStateReceiver extends BroadcastReceiver {
 		@Override
 		public void onReceive(Context ctx, Intent i) {
 			if (!running) return;
-			if (isApEnabledEvent(i)) {
+			Object o = ctx.getSystemService(CONNECTIVITY_SERVICE);
-				// The state change may be broadcast before the AP address is
+			ConnectivityManager cm = (ConnectivityManager) o;
-				// visible, so delay handling the event
+			NetworkInfo net = cm.getActiveNetworkInfo();
-				scheduler.schedule(this::handleConnectivityChange, 1, SECONDS);
+			if (net != null && net.getType() == TYPE_WIFI && net.isConnected()) {
-			} else {
+				LOG.info("Connected to Wi-Fi");
 				handleConnectivityChange();
 			}
 		}
 		private void handleConnectivityChange() {
 			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()) {
+			} else {
-				LOG.info("Not connected to wifi");
+				LOG.info("Not connected to Wi-Fi");
 				socketFactory = SocketFactory.getDefault();
 				tryToClose(socket);
 			} else {
 				LOG.info("Connected to wifi");
 				socketFactory = getSocketFactory();
 				if (socket == null || socket.isClosed()) bind();
 			}
 		}
 		private boolean isApEnabledEvent(Intent i) {
 			return WIFI_AP_STATE_CHANGED_ACTION.equals(i.getAction()) &&
 					i.getIntExtra(EXTRA_WIFI_STATE, 0) == WIFI_AP_STATE_ENABLED;
 		}
 	}
 }
--- a/bramble-android/src/main/java/org/briarproject/bramble/plugin/tcp/AndroidLanTcpPluginFactory.java
+++ b/bramble-android/src/main/java/org/briarproject/bramble/plugin/tcp/AndroidLanTcpPluginFactory.java
@@ -11,7 +11,6 @@ import org.briarproject.bramble.api.plugin.duplex.DuplexPluginCallback;
 import org.briarproject.bramble.api.plugin.duplex.DuplexPluginFactory;
 import java.util.concurrent.Executor;
 import java.util.concurrent.ScheduledExecutorService;
 import javax.annotation.concurrent.Immutable;
@@ -28,15 +27,12 @@ public class AndroidLanTcpPluginFactory implements DuplexPluginFactory {
 	private static final double BACKOFF_BASE = 1.2;
 	private final Executor ioExecutor;
 	private final ScheduledExecutorService scheduler;
 	private final BackoffFactory backoffFactory;
 	private final Context appContext;
 	public AndroidLanTcpPluginFactory(Executor ioExecutor,
-			ScheduledExecutorService scheduler, BackoffFactory backoffFactory,
+			BackoffFactory backoffFactory, Context appContext) {
 			Context appContext) {
 		this.ioExecutor = ioExecutor;
 		this.scheduler = scheduler;
 		this.backoffFactory = backoffFactory;
 		this.appContext = appContext;
 	}
@@ -55,7 +51,7 @@ public class AndroidLanTcpPluginFactory implements DuplexPluginFactory {
 	public DuplexPlugin createPlugin(DuplexPluginCallback callback) {
 		Backoff backoff = backoffFactory.createBackoff(MIN_POLLING_INTERVAL,
 				MAX_POLLING_INTERVAL, BACKOFF_BASE);
-		return new AndroidLanTcpPlugin(ioExecutor, scheduler, backoff,
+		return new AndroidLanTcpPlugin(ioExecutor, backoff, appContext,
-				appContext, callback, MAX_LATENCY, MAX_IDLE_TIME);
+				callback, MAX_LATENCY, MAX_IDLE_TIME);
 	}
 }
--- a/bramble-android/src/main/java/org/briarproject/bramble/plugin/tor/TorPlugin.java
+++ b/bramble-android/src/main/java/org/briarproject/bramble/plugin/tor/TorPlugin.java
@@ -16,7 +16,6 @@ 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;
@@ -32,9 +31,11 @@ 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.reporting.DevReporter;
 import org.briarproject.bramble.api.settings.Settings;
 import org.briarproject.bramble.api.settings.event.SettingsUpdatedEvent;
 import org.briarproject.bramble.api.system.LocationUtils;
 import org.briarproject.bramble.util.AndroidUtils;
 import org.briarproject.bramble.util.IoUtils;
 import org.briarproject.bramble.util.StringUtils;
@@ -58,10 +59,7 @@ import java.util.Map.Entry;
 import java.util.Scanner;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.Executor;
 import java.util.concurrent.Future;
 import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.concurrent.atomic.AtomicReference;
 import java.util.logging.Logger;
 import java.util.regex.Pattern;
 import java.util.zip.ZipInputStream;
@@ -72,15 +70,10 @@ import javax.net.SocketFactory;
 import static android.content.Context.CONNECTIVITY_SERVICE;
 import static android.content.Context.MODE_PRIVATE;
 import static android.content.Context.POWER_SERVICE;
 import static android.content.Intent.ACTION_SCREEN_OFF;
 import static android.content.Intent.ACTION_SCREEN_ON;
 import static android.net.ConnectivityManager.CONNECTIVITY_ACTION;
 import static android.net.ConnectivityManager.TYPE_WIFI;
 import static android.os.Build.VERSION.SDK_INT;
 import static android.os.PowerManager.ACTION_DEVICE_IDLE_MODE_CHANGED;
 import static android.os.PowerManager.PARTIAL_WAKE_LOCK;
 import static java.util.concurrent.TimeUnit.MILLISECONDS;
 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;
@@ -108,10 +101,10 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 	private static final Logger LOG =
 			Logger.getLogger(TorPlugin.class.getName());
-	private final Executor ioExecutor, connectionStatusExecutor;
+	private final Executor ioExecutor;
 	private final ScheduledExecutorService scheduler;
 	private final Context appContext;
 	private final LocationUtils locationUtils;
 	private final DevReporter reporter;
 	private final SocketFactory torSocketFactory;
 	private final Backoff backoff;
 	private final DuplexPluginCallback callback;
@@ -121,8 +114,6 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 	private final File torDirectory, torFile, geoIpFile, configFile;
 	private final File doneFile, cookieFile;
 	private final PowerManager.WakeLock wakeLock;
 	private final AtomicReference<Future<?>> connectivityCheck =
 			new AtomicReference<>();
 	private final AtomicBoolean used = new AtomicBoolean(false);
 	private volatile boolean running = false;
@@ -131,15 +122,15 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 	private volatile TorControlConnection controlConnection = null;
 	private volatile BroadcastReceiver networkStateReceiver = null;
-	TorPlugin(Executor ioExecutor, ScheduledExecutorService scheduler,
+	TorPlugin(Executor ioExecutor, Context appContext,
-			Context appContext, LocationUtils locationUtils,
+			LocationUtils locationUtils, DevReporter reporter,
 			SocketFactory torSocketFactory, Backoff backoff,
-			DuplexPluginCallback callback, String architecture,
+			DuplexPluginCallback callback, String architecture, int maxLatency,
-			int maxLatency, int maxIdleTime) {
+			int maxIdleTime) {
 		this.ioExecutor = ioExecutor;
 		this.scheduler = scheduler;
 		this.appContext = appContext;
 		this.locationUtils = locationUtils;
 		this.reporter = reporter;
 		this.torSocketFactory = torSocketFactory;
 		this.backoff = backoff;
 		this.callback = callback;
@@ -161,9 +152,6 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		// This tag will prevent Huawei's powermanager from killing us.
 		wakeLock = pm.newWakeLock(PARTIAL_WAKE_LOCK, "LocationManagerService");
 		wakeLock.setReferenceCounted(false);
 		// Don't execute more than one connection status check at a time
 		connectionStatusExecutor = new PoliteExecutor("TorPlugin",
 				ioExecutor, 1);
 	}
 	@Override
@@ -216,11 +204,11 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		if (LOG.isLoggable(INFO)) {
 			Scanner stdout = new Scanner(torProcess.getInputStream());
 			Scanner stderr = new Scanner(torProcess.getErrorStream());
-			while (stdout.hasNextLine() || stderr.hasNextLine()) {
+			while (stdout.hasNextLine() || stderr.hasNextLine()){
-				if (stdout.hasNextLine()) {
+				if(stdout.hasNextLine()) {
 					LOG.info(stdout.nextLine());
 				}
-				if (stderr.hasNextLine()) {
+				if(stderr.hasNextLine()){
 					LOG.info(stderr.nextLine());
 				}
 			}
@@ -269,11 +257,7 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		}
 		// Register to receive network status events
 		networkStateReceiver = new NetworkStateReceiver();
-		IntentFilter filter = new IntentFilter();
+		IntentFilter filter = new IntentFilter(CONNECTIVITY_ACTION);
 		filter.addAction(CONNECTIVITY_ACTION);
 		filter.addAction(ACTION_SCREEN_ON);
 		filter.addAction(ACTION_SCREEN_OFF);
 		if (SDK_INT >= 23) filter.addAction(ACTION_DEVICE_IDLE_MODE_CHANGED);
 		appContext.registerReceiver(networkStateReceiver, filter);
 		// Bind a server socket to receive incoming hidden service connections
 		bind();
@@ -385,6 +369,14 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		}
 	}
 	private void sendDevReports() {
 		ioExecutor.execute(() -> {
 			// TODO: Trigger this with a TransportEnabledEvent
 			File reportDir = AndroidUtils.getReportDir(appContext);
 			reporter.sendReports(reportDir);
 		});
 	}
 	private void bind() {
 		ioExecutor.execute(() -> {
 			// If there's already a port number stored in config, reuse it
@@ -602,7 +594,7 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 	@Override
 	public DuplexTransportConnection createKeyAgreementConnection(
-			byte[] commitment, BdfList descriptor) {
+			byte[] commitment, BdfList descriptor, long timeout) {
 		throw new UnsupportedOperationException();
 	}
@@ -612,7 +604,10 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 				connectionStatus.getAndSetCircuitBuilt()) {
 			LOG.info("First circuit built");
 			backoff.reset();
-			if (isRunning()) callback.transportEnabled();
+			if (isRunning()) {
 				sendDevReports();
 				callback.transportEnabled();
 			}
 		}
 	}
@@ -623,8 +618,6 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 	@Override
 	public void orConnStatus(String status, String orName) {
 		if (LOG.isLoggable(INFO)) LOG.info("OR connection " + status);
 		if (status.equals("CLOSED") || status.equals("FAILED"))
 			updateConnectionStatus(); // Check whether we've lost connectivity
 	}
 	@Override
@@ -641,7 +634,10 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		if (severity.equals("NOTICE") && msg.startsWith("Bootstrapped 100%")) {
 			connectionStatus.setBootstrapped();
 			backoff.reset();
-			if (isRunning()) callback.transportEnabled();
+			if (isRunning()) {
 				sendDevReports();
 				callback.transportEnabled();
 			}
 		}
 	}
@@ -661,7 +657,7 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		}
 		@Override
-		public void onEvent(int event, @Nullable String path) {
+		public void onEvent(int event, String path) {
 			stopWatching();
 			latch.countDown();
 		}
@@ -679,8 +675,9 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 	}
 	private void updateConnectionStatus() {
-		connectionStatusExecutor.execute(() -> {
+		ioExecutor.execute(() -> {
 			if (!running) return;
 			Object o = appContext.getSystemService(CONNECTIVITY_SERVICE);
 			ConnectivityManager cm = (ConnectivityManager) o;
 			NetworkInfo net = cm.getActiveNetworkInfo();
@@ -719,25 +716,14 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		});
 	}
 	private void scheduleConnectionStatusUpdate() {
 		Future<?> newConnectivityCheck =
 				scheduler.schedule(this::updateConnectionStatus, 1, MINUTES);
 		Future<?> oldConnectivityCheck =
 				connectivityCheck.getAndSet(newConnectivityCheck);
 		if (oldConnectivityCheck != null) oldConnectivityCheck.cancel(false);
 	}
 	private class NetworkStateReceiver extends BroadcastReceiver {
 		@Override
 		public void onReceive(Context ctx, Intent i) {
 			if (!running) return;
-			String action = i.getAction();
+			if (CONNECTIVITY_ACTION.equals(i.getAction())) {
-			if (LOG.isLoggable(INFO)) LOG.info("Received broadcast " + action);
+				LOG.info("Detected connectivity change");
-			updateConnectionStatus();
+				updateConnectionStatus();
 			if (ACTION_SCREEN_ON.equals(action)
 					|| ACTION_SCREEN_OFF.equals(action)) {
 				scheduleConnectionStatusUpdate();
 			}
 		}
 	}
@@ -760,7 +746,7 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		private synchronized void enableNetwork(boolean enable) {
 			networkEnabled = enable;
-			if (!enable) circuitBuilt = false;
+			circuitBuilt = false;
 		}
 		private synchronized boolean isConnected() {
--- a/bramble-android/src/main/java/org/briarproject/bramble/plugin/tor/TorPluginFactory.java
+++ b/bramble-android/src/main/java/org/briarproject/bramble/plugin/tor/TorPluginFactory.java
@@ -12,11 +12,11 @@ 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.reporting.DevReporter;
 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;
@@ -36,21 +36,21 @@ public class TorPluginFactory implements DuplexPluginFactory {
 	private static final double BACKOFF_BASE = 1.2;
 	private final Executor ioExecutor;
 	private final ScheduledExecutorService scheduler;
 	private final Context appContext;
 	private final LocationUtils locationUtils;
 	private final DevReporter reporter;
 	private final EventBus eventBus;
 	private final SocketFactory torSocketFactory;
 	private final BackoffFactory backoffFactory;
-	public TorPluginFactory(Executor ioExecutor,
+	public TorPluginFactory(Executor ioExecutor, Context appContext,
-			ScheduledExecutorService scheduler, Context appContext,
+			LocationUtils locationUtils, DevReporter reporter,
-			LocationUtils locationUtils, EventBus eventBus,
+			EventBus eventBus, SocketFactory torSocketFactory,
-			SocketFactory torSocketFactory, BackoffFactory backoffFactory) {
+			BackoffFactory backoffFactory) {
 		this.ioExecutor = ioExecutor;
 		this.scheduler = scheduler;
 		this.appContext = appContext;
 		this.locationUtils = locationUtils;
 		this.reporter = reporter;
 		this.eventBus = eventBus;
 		this.torSocketFactory = torSocketFactory;
 		this.backoffFactory = backoffFactory;
@@ -89,9 +89,9 @@ public class TorPluginFactory implements DuplexPluginFactory {
 		Backoff backoff = backoffFactory.createBackoff(MIN_POLLING_INTERVAL,
 				MAX_POLLING_INTERVAL, BACKOFF_BASE);
-		TorPlugin plugin = new TorPlugin(ioExecutor, scheduler, appContext,
+		TorPlugin plugin = new TorPlugin(ioExecutor, appContext, locationUtils,
-				locationUtils, torSocketFactory, backoff, callback,
+				reporter, torSocketFactory, backoff, callback, architecture,
-				architecture, MAX_LATENCY, MAX_IDLE_TIME);
+				MAX_LATENCY, MAX_IDLE_TIME);
 		eventBus.addListener(plugin);
 		return plugin;
 	}
--- a/bramble-android/src/main/java/org/briarproject/bramble/system/AndroidSecureRandomProvider.java
+++ b/bramble-android/src/main/java/org/briarproject/bramble/system/AndroidSecureRandomProvider.java
@@ -9,7 +9,6 @@ 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;
@@ -67,12 +66,9 @@ class AndroidSecureRandomProvider extends LinuxSecureRandomProvider {
 	@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
--- a/bramble-android/src/main/java/org/briarproject/bramble/util/AndroidUtils.java
+++ b/bramble-android/src/main/java/org/briarproject/bramble/util/AndroidUtils.java
@@ -1,29 +1,20 @@
 package org.briarproject.bramble.util;
 import android.annotation.SuppressLint;
 import android.bluetooth.BluetoothAdapter;
 import android.content.Context;
 import android.content.SharedPreferences;
 import android.os.Build;
 import android.provider.Settings;
 import java.io.File;
 import java.io.FileNotFoundException;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.List;
 import java.util.Scanner;
 import java.util.logging.Logger;
 import static android.content.Context.MODE_PRIVATE;
 import static java.util.logging.Level.INFO;
 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";
@@ -44,7 +35,6 @@ public class AndroidUtils {
 	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
@@ -61,77 +51,17 @@ public class AndroidUtils {
 				&& !address.equals(FAKE_BLUETOOTH_ADDRESS);
 	}
-	public static void logDataDirContents(Context ctx) {
+	public static void deleteAppData(Context ctx) {
 		if (LOG.isLoggable(INFO)) {
 			LOG.info("Contents of data directory:");
 			logFileOrDir(new File(ctx.getApplicationInfo().dataDir));
 		}
 	}
 	private static void logFileOrDir(File f) {
 		LOG.info(f.getAbsolutePath() + " " + f.length());
 		if (f.isDirectory()) {
 			File[] children = f.listFiles();
 			if (children == null) {
 				LOG.info("Could not list files in " + f.getAbsolutePath());
 			} else {
 				for (File child : children) logFileOrDir(child);
 			}
 		}
 	}
 	public static File getSharedPrefsFile(Context ctx, String name) {
 		File dataDir = new File(ctx.getApplicationInfo().dataDir);
 		File prefsDir = new File(dataDir, "shared_prefs");
 		return new File(prefsDir, name + ".xml");
 	}
 	public static void logFileContents(File f) {
 		if (LOG.isLoggable(INFO)) {
 			LOG.info("Contents of " + f.getAbsolutePath() + ":");
 			try {
 				Scanner s = new Scanner(f);
 				while (s.hasNextLine()) LOG.info(s.nextLine());
 				s.close();
 			} catch (FileNotFoundException e) {
 				LOG.info(f.getAbsolutePath() + " not found");
 			}
 		}
 	}
 	@SuppressLint("ApplySharedPref")
 	public static void deleteAppData(Context ctx, SharedPreferences... clear) {
 		// Clear and commit shared preferences
 		for (SharedPreferences prefs : clear) {
 			boolean cleared = prefs.edit().clear().commit();
 			if (LOG.isLoggable(INFO)) {
 				if (cleared) LOG.info("Cleared shared preferences");
 				else LOG.info("Could not clear shared preferences");
 			}
 		}
 		// Delete files, except lib and shared_prefs directories
 		File dataDir = new File(ctx.getApplicationInfo().dataDir);
 		if (LOG.isLoggable(INFO))
 			LOG.info("Deleting app data from " + dataDir.getAbsolutePath());
 		File[] children = dataDir.listFiles();
 		if (children != null) {
 			for (File child : children) {
-				String name = child.getName();
+				if (!child.getName().equals("lib"))
 				if (!name.equals("lib") && !name.equals("shared_prefs")) {
 					if (LOG.isLoggable(INFO))
 						LOG.info("Deleting " + child.getAbsolutePath());
 					IoUtils.deleteFileOrDir(child);
 				}
 			}
 		} else if (LOG.isLoggable(INFO)) {
 			LOG.info("Could not list files in " + dataDir.getAbsolutePath());
 		}
 		// Recreate the cache dir as some OpenGL drivers expect it to exist
-		boolean recreated = new File(dataDir, "cache").mkdir();
+		new File(dataDir, "cache").mkdir();
 		if (LOG.isLoggable(INFO)) {
 			if (recreated) LOG.info("Recreated cache dir");
 			else LOG.info("Could not recreate cache dir");
 		}
 	}
 	public static File getReportDir(Context ctx) {
--- a/bramble-api/build.gradle
+++ b/bramble-api/build.gradle
@@ -2,7 +2,6 @@ apply plugin: 'java-library'
 sourceCompatibility = 1.8
 targetCompatibility = 1.8
 apply plugin: 'ru.vyarus.animalsniffer'
 apply plugin: 'witness'
 dependencies {
@@ -15,8 +14,6 @@ dependencies {
 	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 {
@@ -29,9 +26,6 @@ dependencyVerification {
 			'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',
@@ -39,7 +33,6 @@ dependencyVerification {
 			'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',
 	]
 }
@@ -55,3 +48,8 @@ task jarTest(type: Jar, dependsOn: testClasses) {
 artifacts {
 	testOutput jarTest
 }
 // If a Java 6 JRE is available, check we're not using any Java 7 or 8 APIs
 tasks.withType(JavaCompile) {
 	useJava6StandardLibrary(it)
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/Multiset.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/Multiset.java
@@ -1,101 +0,0 @@
 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());
 	}
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/UnsupportedVersionException.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/UnsupportedVersionException.java
@@ -1,9 +0,0 @@
 package org.briarproject.bramble.api;
 import java.io.IOException;
 /**
 * An exception that indicates an unrecoverable version mismatch.
 */
 public class UnsupportedVersionException extends IOException {
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/client/ClientHelper.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/client/ClientHelper.java
@@ -5,10 +5,7 @@ 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;
@@ -90,30 +87,16 @@ public interface ClientHelper {
 	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,
+	void verifySignature(String label, byte[] sig, byte[] publicKey,
-			byte[] publicKey) throws FormatException, GeneralSecurityException;
+			BdfList signed) throws FormatException, GeneralSecurityException;
 	Author parseAndValidateAuthor(BdfList author) throws FormatException;
 	TransportProperties parseAndValidateTransportProperties(
 			BdfDictionary properties) throws FormatException;
 	Map<TransportId, TransportProperties> parseAndValidateTransportPropertiesMap(
 			BdfDictionary properties) throws FormatException;
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/client/ContactGroupFactory.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/client/ContactGroupFactory.java
@@ -12,19 +12,18 @@ public interface ContactGroupFactory {
 	/**
 	 * Creates a group that is not shared with any contacts.
 	 */
-	Group createLocalGroup(ClientId clientId, int majorVersion);
+	Group createLocalGroup(ClientId clientId);
 	/**
 	 * Creates a group for the given client to share with the given contact.
 	 */
-	Group createContactGroup(ClientId clientId, int majorVersion,
+	Group createContactGroup(ClientId clientId, Contact contact);
 			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,
+	Group createContactGroup(ClientId clientId, AuthorId authorId1,
-			AuthorId authorId1, AuthorId authorId2);
+			AuthorId authorId2);
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/contact/ContactExchangeTask.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/contact/ContactExchangeTask.java
@@ -12,32 +12,6 @@ import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
@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.
 	 */
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/contact/ContactId.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/contact/ContactId.java
@@ -6,7 +6,7 @@ import javax.annotation.concurrent.Immutable;
 /**
 * Type-safe wrapper for an integer that uniquely identifies a contact within
- * the scope of the local device.
+ * the scope of a single node.
 */
@Immutable
@NotNullByDefault
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/contact/ContactManager.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/contact/ContactManager.java
@@ -5,7 +5,6 @@ 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;
@@ -14,40 +13,30 @@ import java.util.Collection;
 public interface ContactManager {
 	/**
-	 * Registers a hook to be called whenever a contact is added or removed.
+	 * Registers a hook to be called whenever a contact is added.
 	 * This method should be called before
 	 * {@link LifecycleManager#startServices(String)}.
 	 */
-	void registerContactHook(ContactHook hook);
+	void registerAddContactHook(AddContactHook hook);
 	/**
-	 * Stores a contact associated with the given local and remote pseudonyms,
+	 * Registers a hook to be called whenever a contact is removed.
-	 * derives and stores transport keys for each transport, and returns an ID
+	 */
-	 * for the contact.
+	void registerRemoveContactHook(RemoveContactHook hook);
-	 *
+
-	 * @param alice true if the local party is Alice
+	/**
 	 * Stores a contact within the given transaction associated with the given
 	 * local and remote pseudonyms, and returns an ID for the contact.
 	 */
 	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
+	 * 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,
+	ContactId addContact(Author remote, AuthorId local,
-			boolean verified, boolean active) throws DbException;
+			SecretKey master, long timestamp, boolean alice, 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.
@@ -105,10 +94,11 @@ public interface ContactManager {
 	boolean contactExists(AuthorId remoteAuthorId, AuthorId localAuthorId)
 			throws DbException;
-	interface ContactHook {
+	interface AddContactHook {
 		void addingContact(Transaction txn, Contact c) throws DbException;
 	}
 	interface RemoveContactHook {
 		void removingContact(Transaction txn, Contact c) throws DbException;
 	}
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/contact/RecordTypes.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/contact/RecordTypes.java
@@ -1,9 +0,0 @@
 package org.briarproject.bramble.api.contact;
 /**
 * Record types for the contact exchange protocol.
 */
 public interface RecordTypes {
 	byte CONTACT_INFO = 0;
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/crypto/CryptoComponent.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/crypto/CryptoComponent.java
@@ -1,13 +1,11 @@
 package org.briarproject.bramble.api.crypto;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.api.plugin.TransportId;
 import org.briarproject.bramble.api.transport.TransportKeys;
 import java.security.GeneralSecurityException;
 import java.security.SecureRandom;
 import javax.annotation.Nullable;
@NotNullByDefault
 public interface CryptoComponent {
 	SecretKey generateSecretKey();
@@ -25,83 +23,153 @@ public interface CryptoComponent {
 	KeyParser getMessageKeyParser();
 	/**
-	 * Derives another secret key from the given secret key.
+	 * Derives a stream header key from the given master secret.
-	 *
+	 * @param alice whether the key is for use by Alice or Bob.
 	 * @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);
+	SecretKey deriveHeaderKey(SecretKey master, boolean alice);
 	/**
 	 * Derives a message authentication code key from the given master secret.
 	 * @param alice whether the key is for use by Alice or Bob.
 	 */
 	SecretKey deriveMacKey(SecretKey master, boolean alice);
 	/**
 	 * Derives a nonce from the given master secret for one of the parties to
 	 * sign.
 	 * @param alice whether the nonce is for use by Alice or Bob.
 	 */
 	byte[] deriveSignatureNonce(SecretKey master, boolean alice);
 	/**
 	 * Derives a commitment to the provided public key.
 	 * <p/>
 	 * Part of BQP.
 	 *
 	 * @param publicKey the public key
 	 * @return the commitment to the provided public key.
 	 */
 	byte[] deriveKeyCommitment(byte[] publicKey);
 	/**
 	 * Derives a common shared secret from two public keys and one of the
 	 * corresponding private keys.
 	 * <p/>
 	 * Part of BQP.
 	 *
-	 * @param label a namespaced label indicating the purpose of this shared
+	 * @param theirPublicKey the ephemeral public key of the remote party
-	 * secret, to prevent it from being repurposed or colliding with a shared
+	 * @param ourKeyPair our ephemeral keypair
-	 * secret derived for another purpose
+	 * @param alice true if ourKeyPair belongs to Alice
 	 * @param theirPublicKey the public key of the remote party
 	 * @param ourKeyPair the key pair of the local party
 	 * @return the shared secret
 	 * @throws GeneralSecurityException
 	 */
-	SecretKey deriveSharedSecret(String label, PublicKey theirPublicKey,
+	SecretKey deriveSharedSecret(byte[] theirPublicKey, KeyPair ourKeyPair,
-			KeyPair ourKeyPair, byte[]... inputs)
+			boolean alice) throws GeneralSecurityException;
 			throws GeneralSecurityException;
 	/**
-	 * Signs the given byte[] with the given private key.
+	 * Derives the content of a confirmation record.
 	 * <p/>
 	 * Part of BQP.
 	 *
-	 * @param label a namespaced label indicating the purpose of this
+	 * @param sharedSecret the common shared secret
-	 * signature, to prevent it from being repurposed or colliding with a
+	 * @param theirPayload the commit payload from the remote party
-	 * signature created for another purpose
+	 * @param ourPayload the commit payload we sent
 	 * @param theirPublicKey the ephemeral public key of the remote party
 	 * @param ourKeyPair our ephemeral keypair
 	 * @param alice true if ourKeyPair belongs to 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,
 			byte[] theirPublicKey, KeyPair ourKeyPair,
 			boolean alice, boolean aliceRecord);
 	/**
 	 * Derives a master secret from the given shared secret.
 	 * <p/>
 	 * Part of BQP.
 	 *
 	 * @param sharedSecret the common shared secret
 	 * @return the master secret
 	 */
 	SecretKey deriveMasterSecret(SecretKey sharedSecret);
 	/**
 	 * Derives a master secret from two public keys and one of the corresponding
 	 * private keys.
 	 * <p/>
 	 * This is a helper method that calls
 	 * deriveMasterSecret(deriveSharedSecret(theirPublicKey, ourKeyPair, alice))
 	 *
 	 * @param theirPublicKey the ephemeral public key of the remote party
 	 * @param ourKeyPair our ephemeral keypair
 	 * @param alice true if ourKeyPair belongs to Alice
 	 * @return the shared secret
 	 * @throws GeneralSecurityException
 	 */
 	SecretKey deriveMasterSecret(byte[] theirPublicKey, KeyPair ourKeyPair,
 			boolean alice) throws GeneralSecurityException;
 	/**
 	 * 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.
 	 */
 	TransportKeys deriveTransportKeys(TransportId t, SecretKey master,
 			long rotationPeriod, boolean alice);
 	/**
 	 * Rotates the given transport keys to the given rotation period. If the
 	 * keys are for a future rotation 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);
 	/**
 	 * Signs the given byte[] with the given PrivateKey.
 	 *
 	 * @param label A label specific to this signature
 	 *              to ensure that the signature cannot be repurposed
 	 */
 	byte[] sign(String label, byte[] toSign, byte[] privateKey)
 			throws GeneralSecurityException;
 	/**
-	 * Verifies that the given signature is valid for the signed data
+	 * Verifies that the given signature is valid for the signedData
-	 * and the given public key.
+	 * and the given publicKey.
 	 *
-	 * @param label a namespaced label indicating the purpose of this
+	 * @param label A label that was specific to this signature
-	 * signature, to prevent it from being repurposed or colliding with a
+	 *              to ensure that the signature cannot be repurposed
 	 * signature created for another purpose
 	 * @return true if the signature was valid, false otherwise.
 	 */
-	boolean verifySignature(byte[] signature, String label, byte[] signed,
+	boolean verify(String label, byte[] signedData, byte[] publicKey,
-			byte[] publicKey) throws GeneralSecurityException;
+			byte[] signature) throws GeneralSecurityException;
 	/**
 	 * Returns the hash of the given inputs. The inputs are unambiguously
 	 * combined by prefixing each input with its length.
 	 *
-	 * @param label a namespaced label indicating the purpose of this hash, to
+	 * @param label A label specific to this hash to ensure that hashes
-	 * prevent it from being repurposed or colliding with a hash created for
+	 *              calculated for distinct purposes don't collide.
 	 * another purpose
 	 */
 	byte[] hash(String label, byte[]... inputs);
 	/**
 	 * Returns the length of hashes produced by
 	 * the {@link CryptoComponent#hash(String, byte[]...)} method.
 	 */
 	int getHashLength();
 	/**
 	 * 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);
+	byte[] mac(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
@@ -117,7 +185,6 @@ public interface CryptoComponent {
 	 * 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);
 	/**
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/crypto/CryptoConstants.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/crypto/CryptoConstants.java
@@ -1,25 +0,0 @@
 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;
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/crypto/KeyAgreementCrypto.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/crypto/KeyAgreementCrypto.java
@@ -1,50 +0,0 @@
 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);
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/crypto/KeyPair.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/crypto/KeyPair.java
@@ -5,7 +5,7 @@ import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import javax.annotation.concurrent.Immutable;
 /**
- * A key pair consisting of a {@link PublicKey} and a {@link PrivateKey}.
+ * A key pair consisting of a {@link PublicKey} and a {@link PrivateKey).
 */
@Immutable
@NotNullByDefault
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/crypto/TransportCrypto.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/crypto/TransportCrypto.java
@@ -1,33 +0,0 @@
 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);
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/data/BdfDictionary.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/data/BdfDictionary.java
@@ -24,9 +24,9 @@ public class BdfDictionary extends TreeMap<String, Object> {
 	 * );
 	 * </pre>
 	 */
-	public static BdfDictionary of(Entry<String, ?>... entries) {
+	public static BdfDictionary of(Entry<String, Object>... entries) {
 		BdfDictionary d = new BdfDictionary();
-		for (Entry<String, ?> e : entries) d.put(e.getKey(), e.getValue());
+		for (Entry<String, Object> e : entries) d.put(e.getKey(), e.getValue());
 		return d;
 	}
@@ -34,7 +34,7 @@ public class BdfDictionary extends TreeMap<String, Object> {
 		super();
 	}
-	public BdfDictionary(Map<String, ?> m) {
+	public BdfDictionary(Map<String, Object> m) {
 		super(m);
 	}
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/data/BdfReader.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/data/BdfReader.java
@@ -8,7 +8,6 @@ import java.io.IOException;
 public interface BdfReader {
 	int DEFAULT_NESTED_LIMIT = 5;
 	int DEFAULT_MAX_BUFFER_SIZE = 64 * 1024;
 	boolean eof() throws IOException;
@@ -40,13 +39,13 @@ public interface BdfReader {
 	boolean hasString() throws IOException;
-	String readString() throws IOException;
+	String readString(int maxLength) throws IOException;
 	void skipString() throws IOException;
 	boolean hasRaw() throws IOException;
-	byte[] readRaw() throws IOException;
+	byte[] readRaw(int maxLength) throws IOException;
 	void skipRaw() throws IOException;
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/data/BdfReaderFactory.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/data/BdfReaderFactory.java
@@ -9,6 +9,5 @@ public interface BdfReaderFactory {
 	BdfReader createReader(InputStream in);
-	BdfReader createReader(InputStream in, int nestedLimit,
+	BdfReader createReader(InputStream in, int nestedLimit);
 			int maxBufferSize);
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/data/ObjectReader.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/data/ObjectReader.java
@@ -0,0 +1,11 @@
 package org.briarproject.bramble.api.data;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import java.io.IOException;
@NotNullByDefault
 public interface ObjectReader<T> {
 	T readObject(BdfReader r) throws IOException;
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/db/DataTooNewException.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/db/DataTooNewException.java
@@ -1,7 +0,0 @@
 package org.briarproject.bramble.api.db;
 /**
 * Thrown when the database uses a newer schema than the current code.
 */
 public class DataTooNewException extends DbException {
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/db/DataTooOldException.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/db/DataTooOldException.java
@@ -1,8 +0,0 @@
 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 {
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/db/DatabaseComponent.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/db/DatabaseComponent.java
@@ -18,8 +18,7 @@ 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.sync.ValidationManager;
 import org.briarproject.bramble.api.transport.KeySetId;
 import org.briarproject.bramble.api.transport.TransportKeys;
 import java.util.Collection;
@@ -38,13 +37,8 @@ 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(@Nullable MigrationListener listener) throws DbException;
+	boolean open() throws DbException;
 	/**
 	 * Waits for any open transactions to finish and closes the database.
@@ -104,11 +98,10 @@ public interface DatabaseComponent {
 			throws DbException;
 	/**
-	 * Stores the given transport keys for the given contact and returns a
+	 * Stores transport keys for a newly added contact.
 	 * key set ID.
 	 */
-	KeySetId addTransportKeys(Transaction txn, ContactId c,
+	void addTransportKeys(Transaction txn, ContactId c, TransportKeys k)
-			TransportKeys k) throws DbException;
+			throws DbException;
 	/**
 	 * Returns true if the database contains the given contact for the given
@@ -130,8 +123,8 @@ public interface DatabaseComponent {
 	/**
 	 * Deletes the message with the given ID. Unlike
-	 * {@link #removeMessage(Transaction, MessageId)}, the message ID,
+	 * {@link #removeMessage(Transaction, MessageId)}, the message ID and any
-	 * dependencies, metadata, and any other associated state are not deleted.
+	 * other associated data are not deleted.
 	 */
 	void deleteMessage(Transaction txn, MessageId m) throws DbException;
@@ -235,8 +228,7 @@ public interface DatabaseComponent {
 	 * <p/>
 	 * Read-only.
 	 */
-	Collection<Group> getGroups(Transaction txn, ClientId c, int majorVersion)
+	Collection<Group> getGroups(Transaction txn, ClientId c) throws DbException;
 			throws DbException;
 	/**
 	 * Returns the given group's visibility to the given contact, or
@@ -262,38 +254,31 @@ public interface DatabaseComponent {
 	Collection<LocalAuthor> getLocalAuthors(Transaction txn) throws DbException;
 	/**
-	 * Returns the IDs of all delivered messages in the given group.
+	 * Returns the IDs of any messages that need to be validated by the given
 	 * client.
 	 * <p/>
 	 * Read-only.
 	 */
-	Collection<MessageId> getMessageIds(Transaction txn, GroupId g)
+	Collection<MessageId> getMessagesToValidate(Transaction txn, ClientId c)
 		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
+	 * Returns the IDs of any messages that are valid but pending delivery due
-	 * dependencies on other messages.
+	 * to dependencies on other messages for the given client.
 	 * <p/>
 	 * Read-only.
 	 */
-	Collection<MessageId> getPendingMessages(Transaction txn)
+	Collection<MessageId> getPendingMessages(Transaction txn, ClientId c)
 			throws DbException;
 	/**
-	 * Returns the IDs of any messages that have shared dependents but have
+	 * Returns the IDs of any messages from the given client
-	 * not yet been shared themselves.
+	 * that have a shared dependent, but are still not shared themselves.
 	 * <p/>
 	 * Read-only.
 	 */
-	Collection<MessageId> getMessagesToShare(Transaction txn)
+	Collection<MessageId> getMessagesToShare(Transaction txn,
-			throws DbException;
+			ClientId c) throws DbException;
 	/**
 	 * Returns the message with the given ID, in serialised form, or null if
@@ -313,9 +298,9 @@ public interface DatabaseComponent {
 			throws DbException;
 	/**
-	 * Returns the metadata for any delivered messages in the given group with
+	 * Returns the metadata for any messages in the given group with metadata
-	 * metadata that matches all entries in the given query. If the query is
+	 * that matches all entries in the given query. If the query is empty, the
-	 * empty, the metadata for all delivered messages is returned.
+	 * metadata for all messages is returned.
 	 * <p/>
 	 * Read-only.
 	 */
@@ -331,8 +316,8 @@ public interface DatabaseComponent {
 			throws DbException;
 	/**
-	 * Returns the metadata for the given delivered or pending message.
+	 * Returns the metadata for the given delivered and pending message.
-	 * This is only meant to be used by the ValidationManager.
+	 * This is meant to be only used by the ValidationManager
 	 * <p/>
 	 * Read-only.
 	 */
@@ -340,8 +325,8 @@ public interface DatabaseComponent {
 			throws DbException;
 	/**
-	 * Returns the status of all delivered messages in the given group with
+	 * Returns the status of all messages in the given group with respect to
-	 * respect to the given contact.
+	 * the given contact.
 	 * <p/>
 	 * Read-only.
 	 */
@@ -350,8 +335,12 @@ public interface DatabaseComponent {
 	/**
 	 * Returns the IDs and states of all dependencies of the given message.
-	 * For missing dependencies and dependencies in other groups, the state
+	 * Missing dependencies have the state
-	 * {@link State UNKNOWN} is returned.
+	 * {@link ValidationManager.State UNKNOWN}.
 	 * Dependencies in other groups have the state
 	 * {@link ValidationManager.State INVALID}.
 	 * Note that these states are not set on the dependencies themselves; the
 	 * returned states should only be taken in the context of the given message.
 	 * <p/>
 	 * Read-only.
 	 */
@@ -359,9 +348,9 @@ public interface DatabaseComponent {
 			throws DbException;
 	/**
-	 * Returns the IDs and states of all dependents of the given message.
+	 * Returns all IDs of messages that depend on the given message.
-	 * Dependents in other groups are not returned. If the given message is
+	 * Messages in other groups that declare a dependency on the given message
-	 * missing, no dependents are returned.
+	 * will be returned even though such dependencies are invalid.
 	 * <p/>
 	 * Read-only.
 	 */
@@ -376,24 +365,14 @@ public interface DatabaseComponent {
 	State getMessageState(Transaction txn, MessageId m) throws DbException;
 	/**
-	 * Returns the status of the given delivered message with respect to the
+	 * Returns the status of the given message with respect to the given
-	 * given contact.
+	 * 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/>
@@ -406,14 +385,15 @@ public interface DatabaseComponent {
 	 * <p/>
 	 * Read-only.
 	 */
-	Collection<KeySet> getTransportKeys(Transaction txn, TransportId t)
+	Map<ContactId, TransportKeys> getTransportKeys(Transaction txn,
-			throws DbException;
+			TransportId t) throws DbException;
 	/**
-	 * Increments the outgoing stream counter for the given transport keys.
+	 * Increments the outgoing stream counter for the given contact and
 	 * transport in the given rotation period .
 	 */
-	void incrementStreamCounter(Transaction txn, TransportId t, KeySetId k)
+	void incrementStreamCounter(Transaction txn, ContactId c, TransportId t,
-			throws DbException;
+			long rotationPeriod) throws DbException;
 	/**
 	 * Merges the given metadata with the existing metadata for the given
@@ -483,12 +463,6 @@ public interface DatabaseComponent {
 	 */
 	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.
 	 */
@@ -524,21 +498,15 @@ public interface DatabaseComponent {
 			Collection<MessageId> dependencies) throws DbException;
 	/**
-	 * Sets the reordering window for the given key set and transport in the
+	 * Sets the reordering window for the given contact and transport in the
 	 * given rotation period.
 	 */
-	void setReorderingWindow(Transaction txn, KeySetId k, TransportId t,
+	void setReorderingWindow(Transaction txn, ContactId c, 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)
+	void updateTransportKeys(Transaction txn,
-			throws DbException;
+			Map<ContactId, TransportKeys> keys) throws DbException;
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/db/MigrationListener.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/db/MigrationListener.java
@@ -1,11 +0,0 @@
 package org.briarproject.bramble.api.db;
 public interface MigrationListener {
 	/**
 	 * This is called when a migration is started while opening the database.
 	 * It will be called once for each migration being applied.
 	 */
 	void onMigrationRun();
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/identity/Author.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/identity/Author.java
@@ -1,13 +1,11 @@
 package org.briarproject.bramble.api.identity;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.util.StringUtils;
+
 import java.io.UnsupportedEncodingException;
 import javax.annotation.concurrent.Immutable;
 import static org.briarproject.bramble.api.identity.AuthorConstants.MAX_AUTHOR_NAME_LENGTH;
 import static org.briarproject.bramble.api.identity.AuthorConstants.MAX_PUBLIC_KEY_LENGTH;
 /**
 * A pseudonym for a user.
 */
@@ -19,25 +17,20 @@ public class Author {
 		NONE, ANONYMOUS, UNKNOWN, UNVERIFIED, VERIFIED, OURSELVES
 	}
 	/**
 	 * The current version of the author structure.
 	 */
 	public static final int FORMAT_VERSION = 1;
 	private final AuthorId id;
 	private final int formatVersion;
 	private final String name;
 	private final byte[] publicKey;
-	public Author(AuthorId id, int formatVersion, String name,
+	public Author(AuthorId id, String name, byte[] publicKey) {
-			byte[] publicKey) {
+		int length;
-		int nameLength = StringUtils.toUtf8(name).length;
+		try {
-		if (nameLength == 0 || nameLength > MAX_AUTHOR_NAME_LENGTH)
+			length = name.getBytes("UTF-8").length;
-			throw new IllegalArgumentException();
+		} catch (UnsupportedEncodingException e) {
-		if (publicKey.length == 0 || publicKey.length > MAX_PUBLIC_KEY_LENGTH)
+			throw new RuntimeException(e);
 		}
 		if (length == 0 || length > AuthorConstants.MAX_AUTHOR_NAME_LENGTH)
 			throw new IllegalArgumentException();
 		this.id = id;
 		this.formatVersion = formatVersion;
 		this.name = name;
 		this.publicKey = publicKey;
 	}
@@ -49,13 +42,6 @@ public class Author {
 		return id;
 	}
 	/**
 	 * Returns the version of the author structure used to create the author.
 	 */
 	public int getFormatVersion() {
 		return formatVersion;
 	}
 	/**
 	 * Returns the author's name.
 	 */
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/identity/AuthorConstants.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/identity/AuthorConstants.java
@@ -1,8 +1,5 @@
 package org.briarproject.bramble.api.identity;
 import static org.briarproject.bramble.api.crypto.CryptoConstants.MAX_SIGNATURE_BYTES;
 import static org.briarproject.bramble.api.crypto.CryptoConstants.MAX_SIGNATURE_PUBLIC_KEY_BYTES;
 public interface AuthorConstants {
 	/**
@@ -11,14 +8,26 @@ public interface AuthorConstants {
 	int MAX_AUTHOR_NAME_LENGTH = 50;
 	/**
-	 * The maximum length of a public key in bytes. This applies to the
+	 * The maximum length of a public key in bytes.
-	 * signature algorithm used by the current {@link Author format version}.
+	 * <p>
 	 * Public keys use SEC1 format: 0x04 x y, where x and y are unsigned
 	 * big-endian integers.
 	 * <p>
 	 * For a 256-bit elliptic curve, the maximum length is 2 * 256 / 8 + 1.
 	 */
-	int MAX_PUBLIC_KEY_LENGTH = MAX_SIGNATURE_PUBLIC_KEY_BYTES;
+	int MAX_PUBLIC_KEY_LENGTH = 65;
 	/**
-	 * The maximum length of a signature in bytes. This applies to the
+	 * The maximum length of a signature in bytes.
-	 * signature algorithm used by the current {@link Author format version}.
+	 * <p>
 	 * A signature is an ASN.1 DER sequence containing two integers, r and s.
 	 * The format is 0x30 len1 0x02 len2 r 0x02 len3 s, where len1 is
 	 * len(0x02 len2 r 0x02 len3 s) as a DER length, len2 is len(r) as a DER
 	 * length, len3 is len(s) as a DER length, and r and s are signed
 	 * big-endian integers of minimal length.
 	 * <p>
 	 * For a 256-bit elliptic curve, the lengths are one byte each, so the
 	 * maximum length is 2 * 256 / 8 + 8.
 	 */
-	int MAX_SIGNATURE_LENGTH = MAX_SIGNATURE_BYTES;
+	int MAX_SIGNATURE_LENGTH = 72;
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/identity/AuthorFactory.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/identity/AuthorFactory.java
@@ -5,27 +5,8 @@ import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
@NotNullByDefault
 public interface AuthorFactory {
 	/**
 	 * Creates an author with the current format version and the given name and
 	 * public key.
 	 */
 	Author createAuthor(String name, byte[] publicKey);
 	/**
 	 * Creates an author with the given format version, name and public key.
 	 */
 	Author createAuthor(int formatVersion, String name, byte[] publicKey);
 	/**
 	 * Creates a local author with the current format version and the given
 	 * name and keys.
 	 */
 	LocalAuthor createLocalAuthor(String name, byte[] publicKey,
 			byte[] privateKey);
 	/**
 	 * Creates a local author with the given format version, name and keys.
 	 */
 	LocalAuthor createLocalAuthor(int formatVersion, String name,
 			byte[] publicKey, byte[] privateKey);
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/identity/AuthorId.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/identity/AuthorId.java
@@ -16,7 +16,7 @@ public class AuthorId extends UniqueId {
 	/**
 	 * Label for hashing authors to calculate their identities.
 	 */
-	public static final String LABEL = "org.briarproject.bramble/AUTHOR_ID";
+	public static final String LABEL = "org.briarproject.bramble.AUTHOR_ID";
 	public AuthorId(byte[] id) {
 		super(id);
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/identity/LocalAuthor.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/identity/LocalAuthor.java
@@ -14,9 +14,9 @@ public class LocalAuthor extends Author {
 	private final byte[] privateKey;
 	private final long created;
-	public LocalAuthor(AuthorId id, int formatVersion, String name,
+	public LocalAuthor(AuthorId id, String name, byte[] publicKey,
-			byte[] publicKey, byte[] privateKey, long created) {
+			byte[] privateKey, long created) {
-		super(id, formatVersion, name, publicKey);
+		super(id, name, publicKey);
 		this.privateKey = privateKey;
 		this.created = created;
 	}
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/keyagreement/KeyAgreementConstants.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/keyagreement/KeyAgreementConstants.java
@@ -3,9 +3,9 @@ package org.briarproject.bramble.api.keyagreement;
 public interface KeyAgreementConstants {
 	/**
-	 * The current version of the BQP protocol. Version number 89 is reserved.
+	 * The current version of the BQP protocol.
 	 */
-	byte PROTOCOL_VERSION = 4;
+	byte PROTOCOL_VERSION = 2;
 	/**
 	 * The length of the record header in bytes.
@@ -22,10 +22,7 @@ public interface KeyAgreementConstants {
 	 */
 	int COMMIT_LENGTH = 16;
-	/**
+	long CONNECTION_TIMEOUT = 20 * 1000; // Milliseconds
 	 * The connection timeout in milliseconds.
 	 */
 	long CONNECTION_TIMEOUT = 20 * 1000;
 	/**
 	 * The transport identifier for Bluetooth.
@@ -36,16 +33,4 @@ public interface KeyAgreementConstants {
 	 * The transport identifier for LAN.
 	 */
 	int TRANSPORT_ID_LAN = 1;
 	/**
 	 * Label for deriving the shared secret.
 	 */
 	String SHARED_SECRET_LABEL =
 			"org.briarproject.bramble.keyagreement/SHARED_SECRET";
 	/**
 	 * Label for deriving the master secret.
 	 */
 	String MASTER_SECRET_LABEL =
 			"org.briarproject.bramble.keyagreement/MASTER_SECRET";
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/keyagreement/KeyAgreementListener.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/keyagreement/KeyAgreementListener.java
@@ -2,7 +2,7 @@ package org.briarproject.bramble.api.keyagreement;
 import org.briarproject.bramble.api.data.BdfList;
-import java.io.IOException;
+import java.util.concurrent.Callable;
 /**
 * An class for managing a particular key agreement listener.
@@ -24,11 +24,11 @@ public abstract class KeyAgreementListener {
 	}
 	/**
-	 * Blocks until an incoming connection is received and returns it.
+	 * Starts listening for incoming connections, and returns a Callable that
-	 *
+	 * will return a KeyAgreementConnection when an incoming connection is
-	 * @throws IOException if an error occurs or {@link #close()} is called.
+	 * received.
 	 */
-	public abstract KeyAgreementConnection accept() throws IOException;
+	public abstract Callable<KeyAgreementConnection> listen();
 	/**
 	 * Closes the underlying server socket.
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/keyagreement/KeyAgreementTaskFactory.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/keyagreement/KeyAgreementTaskFactory.java
@@ -0,0 +1,15 @@
 package org.briarproject.bramble.api.keyagreement;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 /**
 * Manages tasks for conducting key agreements with remote peers.
 */
@NotNullByDefault
 public interface KeyAgreementTaskFactory {
 	/**
 	 * Gets the current key agreement task.
 	 */
 	KeyAgreementTask createTask();
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/keyagreement/event/KeyAgreementStoppedListeningEvent.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/keyagreement/event/KeyAgreementStoppedListeningEvent.java
@@ -1,9 +0,0 @@
 package org.briarproject.bramble.api.keyagreement.event;
 import org.briarproject.bramble.api.event.Event;
 /**
 * An event that is broadcast when a BQP task stops listening.
 */
 public class KeyAgreementStoppedListeningEvent extends Event {
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/lifecycle/LifecycleManager.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/lifecycle/LifecycleManager.java
@@ -21,42 +21,21 @@ public interface LifecycleManager {
 	 * The result of calling {@link #startServices(String)}.
 	 */
 	enum StartResult {
-		ALREADY_RUNNING,
+		ALREADY_RUNNING, DB_ERROR, SERVICE_ERROR, SUCCESS
 		DB_ERROR,
 		DATA_TOO_OLD_ERROR,
 		DATA_TOO_NEW_ERROR,
 		SERVICE_ERROR,
 		SUCCESS
 	}
 	/**
-	 * The state the lifecycle can be in.
+	 * Registers a {@link Service} to be started and stopped.
 	 * Returned by {@link #getLifecycleState()}
 	 */
 	enum LifecycleState {
 		STARTING, MIGRATING_DATABASE, STARTING_SERVICES, RUNNING, STOPPING;
 		public boolean isAfter(LifecycleState state) {
 			return ordinal() > state.ordinal();
 		}
 	}
 	/**
 	 * Registers a {@link Service} to be started and stopped. This method
 	 * should be called before {@link #startServices(String)}.
 	 */
 	void registerService(Service s);
 	/**
-	 * Registers a {@link Client} to be started. This method should be called
+	 * Registers a {@link Client} to be started.
 	 * before {@link #startServices(String)}.
 	 */
 	void registerClient(Client c);
 	/**
-	 * Registers an {@link ExecutorService} to be shut down. This method
+	 * Registers an {@link ExecutorService} to be shut down.
 	 * should be called before {@link #startServices(String)}.
 	 */
 	void registerForShutdown(ExecutorService e);
@@ -92,10 +71,4 @@ public interface LifecycleManager {
 	 * the {@link DatabaseComponent} to be closed before returning.
 	 */
 	void waitForShutdown() throws InterruptedException;
 	/**
 	 * Returns the current state of the lifecycle.
 	 */
 	LifecycleState getLifecycleState();
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/lifecycle/event/LifecycleEvent.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/lifecycle/event/LifecycleEvent.java
@@ -1,20 +0,0 @@
 package org.briarproject.bramble.api.lifecycle.event;
 import org.briarproject.bramble.api.event.Event;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager.LifecycleState;
 /**
 * An event that is broadcast when the app enters a new lifecycle state.
 */
 public class LifecycleEvent extends Event {
 	private final LifecycleState state;
 	public LifecycleEvent(LifecycleState state) {
 		this.state = state;
 	}
 	public LifecycleState getLifecycleState() {
 		return state;
 	}
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/lifecycle/event/ShutdownEvent.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/lifecycle/event/ShutdownEvent.java
@@ -0,0 +1,9 @@
 package org.briarproject.bramble.api.lifecycle.event;
 import org.briarproject.bramble.api.event.Event;
 /**
 * An event that is broadcast when the app is shutting down.
 */
 public class ShutdownEvent extends Event {
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/plugin/TransportId.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/plugin/TransportId.java
@@ -1,23 +1,22 @@
 package org.briarproject.bramble.api.plugin;
-import org.briarproject.bramble.util.StringUtils;
+import java.nio.charset.Charset;
 /**
- * Type-safe wrapper for a namespaced string that uniquely identifies a
+ * Type-safe wrapper for a string that uniquely identifies a transport plugin.
 * transport plugin.
 */
 public class TransportId {
 	/**
-	 * The maximum length of a transport identifier in UTF-8 bytes.
+	 * The maximum length of transport identifier in UTF-8 bytes.
 	 */
-	public static int MAX_TRANSPORT_ID_LENGTH = 100;
+	public static int MAX_TRANSPORT_ID_LENGTH = 64;
 	private final String id;
 	public TransportId(String id) {
-		int length = StringUtils.toUtf8(id).length;
+		byte[] b = id.getBytes(Charset.forName("UTF-8"));
-		if (length == 0 || length > MAX_TRANSPORT_ID_LENGTH)
+		if (b.length == 0 || b.length > MAX_TRANSPORT_ID_LENGTH)
 			throw new IllegalArgumentException();
 		this.id = id;
 	}
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/plugin/duplex/DuplexPlugin.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/plugin/duplex/DuplexPlugin.java
@@ -36,9 +36,9 @@ public interface DuplexPlugin extends Plugin {
 	/**
 	 * Attempts to connect to the remote peer specified in the given descriptor.
-	 * Returns null if no connection can be established.
+	 * Returns null if no connection can be established within the given time.
 	 */
 	@Nullable
 	DuplexTransportConnection createKeyAgreementConnection(
-			byte[] remoteCommitment, BdfList descriptor);
+			byte[] remoteCommitment, BdfList descriptor, long timeout);
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/plugin/event/BluetoothEnabledEvent.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/plugin/event/BluetoothEnabledEvent.java
@@ -1,15 +0,0 @@
 package org.briarproject.bramble.api.plugin.event;
 import org.briarproject.bramble.api.event.Event;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import javax.annotation.concurrent.Immutable;
 /**
 * An event that informs the Bluetooth plugin that we have enabled the
 * Bluetooth adapter.
 */
@Immutable
@NotNullByDefault
 public class BluetoothEnabledEvent extends Event {
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/plugin/event/EnableBluetoothEvent.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/plugin/event/EnableBluetoothEvent.java
@@ -6,7 +6,7 @@ import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import javax.annotation.concurrent.Immutable;
 /**
- * An event that asks the Bluetooth plugin to enable the Bluetooth adapter.
+ * An event asks the Bluetooth plugin to enable the Bluetooth adapter.
 */
@Immutable
@NotNullByDefault
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/properties/TransportPropertyManager.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/properties/TransportPropertyManager.java
@@ -15,17 +15,7 @@ public interface TransportPropertyManager {
 	/**
 	 * The unique ID of the transport property client.
 	 */
-	ClientId CLIENT_ID = new ClientId("org.briarproject.bramble.properties");
+	ClientId CLIENT_ID = new ClientId("org.briarproject.briar.properties");
 	/**
 	 * The current major version of the transport property client.
 	 */
 	int MAJOR_VERSION = 0;
 	/**
 	 * The current minor version of the transport property client.
 	 */
 	int MINOR_VERSION = 0;
 	/**
 	 * Stores the given properties received while adding a contact - they will
@@ -42,8 +32,8 @@ public interface TransportPropertyManager {
 	/**
 	 * Returns the local transport properties for all transports.
-	 * <p/>
+	 * <br/>
-	 * Read-only.
+	 * TODO: Transaction can be read-only when code is simplified
 	 */
 	Map<TransportId, TransportProperties> getLocalProperties(Transaction txn)
 			throws DbException;
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/record/Record.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/record/Record.java
@@ -1,36 +0,0 @@
 package org.briarproject.bramble.api.record;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import javax.annotation.concurrent.Immutable;
@Immutable
@NotNullByDefault
 public class Record {
 	public static final int RECORD_HEADER_BYTES = 4;
 	public static final int MAX_RECORD_PAYLOAD_BYTES = 48 * 1024; // 48 KiB
 	private final byte protocolVersion, recordType;
 	private final byte[] payload;
 	public Record(byte protocolVersion, byte recordType, byte[] payload) {
 		if (payload.length > MAX_RECORD_PAYLOAD_BYTES)
 			throw new IllegalArgumentException();
 		this.protocolVersion = protocolVersion;
 		this.recordType = recordType;
 		this.payload = payload;
 	}
 	public byte getProtocolVersion() {
 		return protocolVersion;
 	}
 	public byte getRecordType() {
 		return recordType;
 	}
 	public byte[] getPayload() {
 		return payload;
 	}
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/record/RecordReader.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/record/RecordReader.java
@@ -1,20 +0,0 @@
 package org.briarproject.bramble.api.record;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import java.io.EOFException;
 import java.io.IOException;
@NotNullByDefault
 public interface RecordReader {
 	/**
 	 * Reads and returns the next record.
 	 *
 	 * @throws EOFException if the end of the stream is reached without reading
 	 * a complete record
 	 */
 	Record readRecord() throws IOException;
 	void close() throws IOException;
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/record/RecordReaderFactory.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/record/RecordReaderFactory.java
@@ -1,8 +0,0 @@
 package org.briarproject.bramble.api.record;
 import java.io.InputStream;
 public interface RecordReaderFactory {
 	RecordReader createRecordReader(InputStream in);
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/record/RecordWriter.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/record/RecordWriter.java
@@ -1,15 +0,0 @@
 package org.briarproject.bramble.api.record;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import java.io.IOException;
@NotNullByDefault
 public interface RecordWriter {
 	void writeRecord(Record r) throws IOException;
 	void flush() throws IOException;
 	void close() throws IOException;
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/record/RecordWriterFactory.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/record/RecordWriterFactory.java
@@ -1,8 +0,0 @@
 package org.briarproject.bramble.api.record;
 import java.io.OutputStream;
 public interface RecordWriterFactory {
 	RecordWriter createRecordWriter(OutputStream out);
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/reporting/DevConfig.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/reporting/DevConfig.java
@@ -3,14 +3,10 @@ package org.briarproject.bramble.api.reporting;
 import org.briarproject.bramble.api.crypto.PublicKey;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import java.io.File;
@NotNullByDefault
 public interface DevConfig {
 	PublicKey getDevPublicKey();
 	String getDevOnionAddress();
 	File getReportDir();
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/reporting/DevReporter.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/reporting/DevReporter.java
@@ -23,6 +23,8 @@ public interface DevReporter {
 	/**
 	 * Sends any reports previously stored on disk.
 	 *
 	 * @param reportDir the directory where reports are stored.
 	 */
-	void sendReports();
+	void sendReports(File reportDir);
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/sync/ClientId.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/sync/ClientId.java
@@ -1,29 +1,19 @@
 package org.briarproject.bramble.api.sync;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.util.StringUtils;
 import javax.annotation.concurrent.Immutable;
 /**
- * Type-safe wrapper for a namespaced string that uniquely identifies a sync
+ * Wrapper for a name-spaced string that uniquely identifies a sync client.
 * client.
 */
@Immutable
@NotNullByDefault
 public class ClientId implements Comparable<ClientId> {
 	/**
 	 * The maximum length of a client identifier in UTF-8 bytes.
 	 */
 	public static int MAX_CLIENT_ID_LENGTH = 100;
 	private final String id;
 	public ClientId(String id) {
 		int length = StringUtils.toUtf8(id).length;
 		if (length == 0 || length > MAX_CLIENT_ID_LENGTH)
 			throw new IllegalArgumentException();
 		this.id = id;
 	}
@@ -46,8 +36,4 @@ public class ClientId implements Comparable<ClientId> {
 		return id.hashCode();
 	}
 	@Override
 	public String toString() {
 		return id;
 	}
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/sync/Group.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/sync/Group.java
@@ -5,43 +5,20 @@ import static org.briarproject.bramble.api.sync.SyncConstants.MAX_GROUP_DESCRIPT
 public class Group {
 	public enum Visibility {
-
+		INVISIBLE, // The group is not visible
-		INVISIBLE(0), // The group is not visible
+		VISIBLE, // The group is visible but messages are not shared
-		VISIBLE(1), // The group is visible, messages are accepted but not sent
+		SHARED // The group is visible and messages are shared
 		SHARED(2); // The group is visible, messages are accepted and sent
 		private final int value;
 		Visibility(int value) {
 			this.value = value;
 		}
 		public int getValue() {
 			return value;
 		}
 		public static Visibility min(Visibility a, Visibility b) {
 			return a.getValue() < b.getValue() ? a : b;
 		}
 	}
 	/**
 	 * The current version of the group format.
 	 */
 	public static final int FORMAT_VERSION = 1;
 	private final GroupId id;
 	private final ClientId clientId;
 	private final int majorVersion;
 	private final byte[] descriptor;
-	public Group(GroupId id, ClientId clientId, int majorVersion,
+	public Group(GroupId id, ClientId clientId, byte[] descriptor) {
 			byte[] descriptor) {
 		if (descriptor.length > MAX_GROUP_DESCRIPTOR_LENGTH)
 			throw new IllegalArgumentException();
 		this.id = id;
 		this.clientId = clientId;
 		this.majorVersion = majorVersion;
 		this.descriptor = descriptor;
 	}
@@ -59,13 +36,6 @@ public class Group {
 		return clientId;
 	}
 	/**
 	 * Returns the major version of the client to which the group belongs.
 	 */
 	public int getMajorVersion() {
 		return majorVersion;
 	}
 	/**
 	 * Returns the group's descriptor.
 	 */
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/sync/GroupFactory.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/sync/GroupFactory.java
@@ -6,7 +6,7 @@ import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 public interface GroupFactory {
 	/**
-	 * Creates a group with the given client ID, major version and descriptor.
+	 * Creates a group with the given client ID and descriptor.
 	 */
-	Group createGroup(ClientId c, int majorVersion, byte[] descriptor);
+	Group createGroup(ClientId c, byte[] descriptor);
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/sync/GroupId.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/sync/GroupId.java
@@ -15,7 +15,7 @@ public class GroupId extends UniqueId {
 	/**
 	 * Label for hashing groups to calculate their identifiers.
 	 */
-	public static final String LABEL = "org.briarproject.bramble/GROUP_ID";
+	public static final String LABEL = "org.briarproject.bramble.GROUP_ID";
 	public GroupId(byte[] id) {
 		super(id);
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/sync/Message.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/sync/Message.java
@@ -5,11 +5,6 @@ import static org.briarproject.bramble.api.sync.SyncConstants.MESSAGE_HEADER_LEN
 public class Message {
 	/**
 	 * The current version of the message format.
 	 */
 	public static final int FORMAT_VERSION = 1;
 	private final MessageId id;
 	private final GroupId groupId;
 	private final long timestamp;
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/sync/MessageFactory.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/sync/MessageFactory.java
@@ -7,7 +7,5 @@ public interface MessageFactory {
 	Message createMessage(GroupId g, long timestamp, byte[] body);
 	Message createMessage(byte[] raw);
 	Message createMessage(MessageId m, byte[] raw);
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/sync/MessageId.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/sync/MessageId.java
@@ -16,13 +16,7 @@ public class MessageId extends UniqueId {
 	/**
 	 * Label for hashing messages to calculate their identifiers.
 	 */
-	public static final String ID_LABEL = "org.briarproject.bramble/MESSAGE_ID";
+	public static final String LABEL = "org.briarproject.bramble.MESSAGE_ID";
 	/**
 	 * Label for hashing blocks of messages.
 	 */
 	public static final String BLOCK_LABEL =
 			"org.briarproject.bramble/MESSAGE_BLOCK";
 	public MessageId(byte[] id) {
 		super(id);
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/sync/SyncRecordReader.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/sync/SyncRecordReader.java
@@ -5,7 +5,7 @@ import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import java.io.IOException;
@NotNullByDefault
-public interface SyncRecordReader {
+public interface RecordReader {
 	boolean eof() throws IOException;
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/sync/SyncRecordReaderFactory.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/sync/SyncRecordReaderFactory.java
@@ -5,7 +5,7 @@ import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import java.io.InputStream;
@NotNullByDefault
-public interface SyncRecordReaderFactory {
+public interface RecordReaderFactory {
-	SyncRecordReader createRecordReader(InputStream in);
+	RecordReader createRecordReader(InputStream in);
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/sync/SyncRecordWriter.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/sync/SyncRecordWriter.java
@@ -5,7 +5,7 @@ import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import java.io.IOException;
@NotNullByDefault
-public interface SyncRecordWriter {
+public interface RecordWriter {
 	void writeAck(Ack a) throws IOException;
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/sync/SyncRecordWriterFactory.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/sync/SyncRecordWriterFactory.java
@@ -5,7 +5,7 @@ import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import java.io.OutputStream;
@NotNullByDefault
-public interface SyncRecordWriterFactory {
+public interface RecordWriterFactory {
-	SyncRecordWriter createRecordWriter(OutputStream out);
+	RecordWriter createRecordWriter(OutputStream out);
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/sync/SyncConstants.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/sync/SyncConstants.java
@@ -2,8 +2,6 @@ package org.briarproject.bramble.api.sync;
 import org.briarproject.bramble.api.UniqueId;
 import static org.briarproject.bramble.api.record.Record.MAX_RECORD_PAYLOAD_BYTES;
 public interface SyncConstants {
 	/**
@@ -12,8 +10,16 @@ public interface SyncConstants {
 	byte PROTOCOL_VERSION = 0;
 	/**
-	 * The maximum length of a group descriptor in bytes.
+	 * The length of the record header in bytes.
 	 */
 	int RECORD_HEADER_LENGTH = 4;
 	/**
 	 * The maximum length of the record payload in bytes.
 	 */
 	int MAX_RECORD_PAYLOAD_LENGTH = 48 * 1024; // 48 KiB
 	/** The maximum length of a group descriptor in bytes. */
 	int MAX_GROUP_DESCRIPTOR_LENGTH = 16 * 1024; // 16 KiB
 	/**
@@ -34,5 +40,5 @@ public interface SyncConstants {
 	/**
 	 * The maximum number of message IDs in an ack, offer or request record.
 	 */
-	int MAX_MESSAGE_IDS = MAX_RECORD_PAYLOAD_BYTES / UniqueId.LENGTH;
+	int MAX_MESSAGE_IDS = MAX_RECORD_PAYLOAD_LENGTH / UniqueId.LENGTH;
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/sync/SyncSessionFactory.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/sync/SyncSessionFactory.java
@@ -2,9 +2,9 @@ package org.briarproject.bramble.api.sync;
 import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.transport.StreamWriter;
 import java.io.InputStream;
 import java.io.OutputStream;
@NotNullByDefault
 public interface SyncSessionFactory {
@@ -12,8 +12,8 @@ public interface SyncSessionFactory {
 	SyncSession createIncomingSession(ContactId c, InputStream in);
 	SyncSession createSimplexOutgoingSession(ContactId c, int maxLatency,
-			StreamWriter streamWriter);
+			OutputStream out);
 	SyncSession createDuplexOutgoingSession(ContactId c, int maxLatency,
-			int maxIdleTime, StreamWriter streamWriter);
+			int maxIdleTime, OutputStream out);
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/sync/ValidationManager.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/sync/ValidationManager.java
@@ -3,7 +3,6 @@ package org.briarproject.bramble.api.sync;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.db.Metadata;
 import org.briarproject.bramble.api.db.Transaction;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 /**
@@ -34,20 +33,15 @@ public interface ValidationManager {
 	}
 	/**
-	 * Registers the message validator for the given client. This method
+	 * Sets the message validator for the given client.
 	 * should be called before {@link LifecycleManager#startServices(String)}.
 	 */
-	void registerMessageValidator(ClientId c, int majorVersion,
+	void registerMessageValidator(ClientId c, MessageValidator v);
 			MessageValidator v);
 	/**
-	 * Registers the incoming message hook for the given client. The hook will
+	 * Sets the incoming message hook for the given client. The hook will be
-	 * be called once for each incoming message that passes validation. This
+	 * called once for each incoming message that passes validation.
 	 * method should be called before
 	 * {@link LifecycleManager#startServices(String)}.
 	 */
-	void registerIncomingMessageHook(ClientId c, int majorVersion,
+	void registerIncomingMessageHook(ClientId c, IncomingMessageHook hook);
 			IncomingMessageHook hook);
 	interface MessageValidator {
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/system/Clock.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/system/Clock.java
@@ -7,12 +7,12 @@ package org.briarproject.bramble.api.system;
 public interface Clock {
 	/**
-	 * @see System#currentTimeMillis()
+	 * @see {@link System#currentTimeMillis()}
 	 */
 	long currentTimeMillis();
 	/**
-	 * @see Thread#sleep(long)
+	 * @see {@link Thread#sleep(long)}
 	 */
 	void sleep(long milliseconds) throws InterruptedException;
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/transport/KeyManager.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/transport/KeyManager.java
@@ -6,8 +6,6 @@ import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.db.Transaction;
 import org.briarproject.bramble.api.plugin.TransportId;
 import java.util.Map;
 import javax.annotation.Nullable;
 /**
@@ -18,30 +16,12 @@ public interface KeyManager {
 	/**
 	 * Informs the key manager that a new contact has been added. Derives and
-	 * stores a set of transport keys for communicating with the contact over
+	 * stores transport keys for communicating with the contact.
 	 * each transport and returns the key set IDs.
 	 * <p/>
 	 * {@link StreamContext StreamContexts} for the contact can be created
 	 * after this method has returned.
 	 *
 	 * @param alice true if the local party is Alice
 	 * @param active whether the derived keys can be used for outgoing streams
 	 */
-	Map<TransportId, KeySetId> addContact(Transaction txn, ContactId c,
+	void addContact(Transaction txn, ContactId c, SecretKey master,
-			SecretKey master, long timestamp, boolean alice, boolean active)
+			long timestamp, boolean alice) throws DbException;
 			throws DbException;
 	/**
 	 * Marks the given transport keys as usable for outgoing streams.
 	 */
 	void activateKeys(Transaction txn, Map<TransportId, KeySetId> keys)
 			throws DbException;
 	/**
 	 * Returns true if we have keys that can be used for outgoing streams to
 	 * the given contact over the given transport.
 	 */
 	boolean canSendOutgoingStreams(ContactId c, TransportId t);
 	/**
 	 * Returns a {@link StreamContext} for sending a stream to the given
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/transport/KeySet.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/transport/KeySet.java
@@ -1,47 +0,0 @@
 package org.briarproject.bramble.api.transport;
 import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import javax.annotation.concurrent.Immutable;
 /**
 * A set of transport keys for communicating with a contact.
 */
@Immutable
@NotNullByDefault
 public class KeySet {
 	private final KeySetId keySetId;
 	private final ContactId contactId;
 	private final TransportKeys transportKeys;
 	public KeySet(KeySetId keySetId, ContactId contactId,
 			TransportKeys transportKeys) {
 		this.keySetId = keySetId;
 		this.contactId = contactId;
 		this.transportKeys = transportKeys;
 	}
 	public KeySetId getKeySetId() {
 		return keySetId;
 	}
 	public ContactId getContactId() {
 		return contactId;
 	}
 	public TransportKeys getTransportKeys() {
 		return transportKeys;
 	}
 	@Override
 	public int hashCode() {
 		return keySetId.hashCode();
 	}
 	@Override
 	public boolean equals(Object o) {
 		return o instanceof KeySet && keySetId.equals(((KeySet) o).keySetId);
 	}
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/transport/KeySetId.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/transport/KeySetId.java
@@ -1,36 +0,0 @@
 package org.briarproject.bramble.api.transport;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import javax.annotation.concurrent.Immutable;
 /**
 * Type-safe wrapper for an integer that uniquely identifies a set of transport
 * keys within the scope of the local device.
 * <p/>
 * Key sets created on a given device must have increasing identifiers.
 */
@Immutable
@NotNullByDefault
 public class KeySetId {
 	private final int id;
 	public KeySetId(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 KeySetId && id == ((KeySetId) o).id;
 	}
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/transport/OutgoingKeys.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/transport/OutgoingKeys.java
@@ -10,20 +10,18 @@ public class OutgoingKeys {
 	private final SecretKey tagKey, headerKey;
 	private final long rotationPeriod, streamCounter;
 	private final boolean active;
 	public OutgoingKeys(SecretKey tagKey, SecretKey headerKey,
-			long rotationPeriod, boolean active) {
+			long rotationPeriod) {
-		this(tagKey, headerKey, rotationPeriod, 0, active);
+		this(tagKey, headerKey, rotationPeriod, 0);
 	}
 	public OutgoingKeys(SecretKey tagKey, SecretKey headerKey,
-			long rotationPeriod, long streamCounter, boolean active) {
+			long rotationPeriod, long streamCounter) {
 		this.tagKey = tagKey;
 		this.headerKey = headerKey;
 		this.rotationPeriod = rotationPeriod;
 		this.streamCounter = streamCounter;
 		this.active = active;
 	}
 	public SecretKey getTagKey() {
@@ -41,8 +39,4 @@ public class OutgoingKeys {
 	public long getStreamCounter() {
 		return streamCounter;
 	}
 	public boolean isActive() {
 		return active;
 	}
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/transport/StreamWriter.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/transport/StreamWriter.java
@@ -1,19 +0,0 @@
 package org.briarproject.bramble.api.transport;
 import java.io.IOException;
 import java.io.OutputStream;
 /**
 * An interface for writing data to a transport connection. Data will be
 * encrypted and authenticated before being written to the connection.
 */
 public interface StreamWriter {
 	OutputStream getOutputStream();
 	/**
 	 * Sends the end of stream marker, informing the recipient that no more
 	 * data will be sent. The connection is flushed but not closed.
 	 */
 	void sendEndOfStream() throws IOException;
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/transport/StreamWriterFactory.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/transport/StreamWriterFactory.java
@@ -12,12 +12,12 @@ public interface StreamWriterFactory {
 	 * Creates an {@link OutputStream OutputStream} for writing to a
 	 * transport stream
 	 */
-	StreamWriter createStreamWriter(OutputStream out, StreamContext ctx);
+	OutputStream createStreamWriter(OutputStream out, StreamContext ctx);
 	/**
 	 * Creates an {@link OutputStream OutputStream} for writing to a contact
 	 * exchange stream.
 	 */
-	StreamWriter createContactExchangeStreamWriter(OutputStream out,
+	OutputStream createContactExchangeStreamWriter(OutputStream out,
 			SecretKey headerKey);
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/transport/TransportConstants.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/transport/TransportConstants.java
@@ -7,7 +7,7 @@ public interface TransportConstants {
 	/**
 	 * The current version of the transport protocol.
 	 */
-	int PROTOCOL_VERSION = 4;
+	int PROTOCOL_VERSION = 3;
 	/**
 	 * The length of the pseudo-random tag in bytes.
@@ -80,32 +80,4 @@ public interface TransportConstants {
 	 * The size of the reordering window.
 	 */
 	int REORDERING_WINDOW_SIZE = 32;
 	/**
 	 * Label for deriving Alice's initial tag key from the master secret.
 	 */
 	String ALICE_TAG_LABEL = "org.briarproject.bramble.transport/ALICE_TAG_KEY";
 	/**
 	 * Label for deriving Bob's initial tag key from the master secret.
 	 */
 	String BOB_TAG_LABEL = "org.briarproject.bramble.transport/BOB_TAG_KEY";
 	/**
 	 * Label for deriving Alice's initial header key from the master secret.
 	 */
 	String ALICE_HEADER_LABEL =
 			"org.briarproject.bramble.transport/ALICE_HEADER_KEY";
 	/**
 	 * Label for deriving Bob's initial header key from the master secret.
 	 */
 	String BOB_HEADER_LABEL =
 			"org.briarproject.bramble.transport/BOB_HEADER_KEY";
 	/**
 	 * Label for deriving the next period's key in key rotation.
 	 */
 	String ROTATE_LABEL = "org.briarproject.bramble.transport/ROTATE";
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/versioning/ClientMajorVersion.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/versioning/ClientMajorVersion.java
@@ -1,50 +0,0 @@
 package org.briarproject.bramble.api.versioning;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.sync.ClientId;
 import javax.annotation.concurrent.Immutable;
@Immutable
@NotNullByDefault
 public class ClientMajorVersion implements Comparable<ClientMajorVersion> {
 	private final ClientId clientId;
 	private final int majorVersion;
 	public ClientMajorVersion(ClientId clientId, int majorVersion) {
 		this.clientId = clientId;
 		this.majorVersion = majorVersion;
 	}
 	public ClientId getClientId() {
 		return clientId;
 	}
 	public int getMajorVersion() {
 		return majorVersion;
 	}
 	@Override
 	public boolean equals(Object o) {
 		if (o instanceof ClientMajorVersion) {
 			ClientMajorVersion cv = (ClientMajorVersion) o;
 			return clientId.equals(cv.clientId)
 					&& majorVersion == cv.majorVersion;
 		}
 		return false;
 	}
 	@Override
 	public int hashCode() {
 		return (clientId.hashCode() << 16) + majorVersion;
 	}
 	@Override
 	public int compareTo(ClientMajorVersion cv) {
 		int compare = clientId.compareTo(cv.clientId);
 		if (compare != 0) return compare;
 		return majorVersion - cv.majorVersion;
 	}
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/versioning/ClientVersioningManager.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/versioning/ClientVersioningManager.java
@@ -1,45 +0,0 @@
 package org.briarproject.bramble.api.versioning;
 import org.briarproject.bramble.api.contact.Contact;
 import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.db.Transaction;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.sync.ClientId;
 import org.briarproject.bramble.api.sync.Group.Visibility;
@NotNullByDefault
 public interface ClientVersioningManager {
 	/**
 	 * The unique ID of the versioning client.
 	 */
 	ClientId CLIENT_ID = new ClientId("org.briarproject.bramble.versioning");
 	/**
 	 * The current major version of the versioning client.
 	 */
 	int MAJOR_VERSION = 0;
 	/**
 	 * Registers a client that will be advertised to contacts. The hook will
 	 * be called when the visibility of the client changes. This method should
 	 * be called before {@link LifecycleManager#startServices(String)}.
 	 */
 	void registerClient(ClientId clientId, int majorVersion, int minorVersion,
 			ClientVersioningHook hook);
 	/**
 	 * Returns the visibility of the given client with respect to the given
 	 * contact.
 	 */
 	Visibility getClientVisibility(Transaction txn, ContactId contactId,
 			ClientId clientId, int majorVersion) throws DbException;
 	interface ClientVersioningHook {
 		void onClientVisibilityChanging(Transaction txn, Contact c,
 				Visibility v) throws DbException;
 	}
 }
--- a/bramble-api/src/main/java/org/briarproject/bramble/util/IoUtils.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/util/IoUtils.java
@@ -9,37 +9,25 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.net.Socket;
 import java.util.logging.Logger;
 import javax.annotation.Nullable;
 import static java.util.logging.Level.INFO;
@NotNullByDefault
 public class IoUtils {
 	private static final Logger LOG = Logger.getLogger(IoUtils.class.getName());
 	public static void deleteFileOrDir(File f) {
 		if (f.isFile()) {
-			delete(f);
+			f.delete();
 		} else if (f.isDirectory()) {
 			File[] children = f.listFiles();
 			if (children != null)
 				for (File child : children) deleteFileOrDir(child);
-			delete(f);
+			f.delete();
 		}
 	}
-	private static void delete(File f) {
+	public static void copyAndClose(InputStream in, OutputStream out)
-		boolean deleted = f.delete();
+			throws IOException {
 		if (LOG.isLoggable(INFO)) {
 			if (deleted) LOG.info("Deleted " + f.getAbsolutePath());
 			else LOG.info("Could not delete " + f.getAbsolutePath());
 		}
 	}
 	public static void copyAndClose(InputStream in, OutputStream out) {
 		byte[] buf = new byte[4096];
 		try {
 			while (true) {
--- a/bramble-api/src/main/java/org/briarproject/bramble/util/StringUtils.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/util/StringUtils.java
@@ -126,10 +126,6 @@ public class StringUtils {
 		return toUtf8(s).length > maxLength;
 	}
 	public static boolean isValidMac(String mac) {
 		return MAC.matcher(mac).matches();
 	}
 	public static byte[] macToBytes(String mac) {
 		if (!MAC.matcher(mac).matches()) throw new IllegalArgumentException();
 		return fromHexString(mac.replaceAll(":", ""));
--- a/bramble-api/src/test/java/org/briarproject/bramble/test/TestUtils.java
+++ b/bramble-api/src/test/java/org/briarproject/bramble/test/TestUtils.java
@@ -2,39 +2,12 @@ package org.briarproject.bramble.test;
 import org.briarproject.bramble.api.UniqueId;
 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.plugin.TransportId;
 import org.briarproject.bramble.api.properties.TransportProperties;
 import org.briarproject.bramble.api.sync.ClientId;
 import org.briarproject.bramble.api.sync.Group;
 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.util.IoUtils;
 import java.io.File;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.Random;
 import java.util.concurrent.atomic.AtomicInteger;
 import static org.briarproject.bramble.api.identity.Author.FORMAT_VERSION;
 import static org.briarproject.bramble.api.identity.AuthorConstants.MAX_AUTHOR_NAME_LENGTH;
 import static org.briarproject.bramble.api.identity.AuthorConstants.MAX_PUBLIC_KEY_LENGTH;
 import static org.briarproject.bramble.api.plugin.TransportId.MAX_TRANSPORT_ID_LENGTH;
 import static org.briarproject.bramble.api.properties.TransportPropertyConstants.MAX_PROPERTY_LENGTH;
 import static org.briarproject.bramble.api.sync.ClientId.MAX_CLIENT_ID_LENGTH;
 import static org.briarproject.bramble.api.sync.SyncConstants.MAX_GROUP_DESCRIPTOR_LENGTH;
 import static org.briarproject.bramble.api.sync.SyncConstants.MAX_MESSAGE_BODY_LENGTH;
 import static org.briarproject.bramble.api.sync.SyncConstants.MESSAGE_HEADER_LENGTH;
 import static org.briarproject.bramble.util.StringUtils.getRandomString;
 public class TestUtils {
 	private static final AtomicInteger nextTestDir =
@@ -61,117 +34,8 @@ public class TestUtils {
 		return getRandomBytes(UniqueId.LENGTH);
 	}
 	public static ClientId getClientId() {
 		return new ClientId(getRandomString(MAX_CLIENT_ID_LENGTH));
 	}
 	public static TransportId getTransportId() {
 		return new TransportId(getRandomString(MAX_TRANSPORT_ID_LENGTH));
 	}
 	public static TransportProperties getTransportProperties(int number) {
 		TransportProperties tp = new TransportProperties();
 		for (int i = 0; i < number; i++) {
 			tp.put(getRandomString(1 + random.nextInt(MAX_PROPERTY_LENGTH)),
 					getRandomString(1 + random.nextInt(MAX_PROPERTY_LENGTH))
 			);
 		}
 		return tp;
 	}
 	public static Map<TransportId, TransportProperties> getTransportPropertiesMap(
 			int number) {
 		Map<TransportId, TransportProperties> map = new HashMap<>();
 		for (int i = 0; i < number; i++) {
 			map.put(getTransportId(), getTransportProperties(number));
 		}
 		return map;
 	}
 	public static SecretKey getSecretKey() {
 		return new SecretKey(getRandomBytes(SecretKey.LENGTH));
 	}
 	public static LocalAuthor getLocalAuthor() {
 		return getLocalAuthor(1 + random.nextInt(MAX_AUTHOR_NAME_LENGTH));
 	}
 	public static LocalAuthor getLocalAuthor(int nameLength) {
 		AuthorId id = new AuthorId(getRandomId());
 		String name = getRandomString(nameLength);
 		byte[] publicKey = getRandomBytes(MAX_PUBLIC_KEY_LENGTH);
 		byte[] privateKey = getRandomBytes(MAX_PUBLIC_KEY_LENGTH);
 		long created = System.currentTimeMillis();
 		return new LocalAuthor(id, FORMAT_VERSION, name, publicKey, privateKey,
 				created);
 	}
 	public static Author getAuthor() {
 		return getAuthor(1 + random.nextInt(MAX_AUTHOR_NAME_LENGTH));
 	}
 	public static Author getAuthor(int nameLength) {
 		AuthorId id = new AuthorId(getRandomId());
 		String name = getRandomString(nameLength);
 		byte[] publicKey = getRandomBytes(MAX_PUBLIC_KEY_LENGTH);
 		return new Author(id, FORMAT_VERSION, name, publicKey);
 	}
 	public static Group getGroup(ClientId clientId, int majorVersion) {
 		int descriptorLength = 1 + random.nextInt(MAX_GROUP_DESCRIPTOR_LENGTH);
 		return getGroup(clientId, majorVersion, descriptorLength);
 	}
 	public static Group getGroup(ClientId clientId, int majorVersion,
 			int descriptorLength) {
 		GroupId groupId = new GroupId(getRandomId());
 		byte[] descriptor = getRandomBytes(descriptorLength);
 		return new Group(groupId, clientId, majorVersion, descriptor);
 	}
 	public static Message getMessage(GroupId groupId) {
 		int bodyLength = 1 + random.nextInt(MAX_MESSAGE_BODY_LENGTH);
 		return getMessage(groupId, MESSAGE_HEADER_LENGTH + bodyLength);
 	}
 	public static Message getMessage(GroupId groupId, int rawLength) {
 		MessageId id = new MessageId(getRandomId());
 		byte[] raw = getRandomBytes(rawLength);
 		long timestamp = System.currentTimeMillis();
 		return new Message(id, groupId, timestamp, raw);
 	}
 	public static double getMedian(Collection<? extends Number> samples) {
 		int size = samples.size();
 		if (size == 0) throw new IllegalArgumentException();
 		List<Double> sorted = new ArrayList<>(size);
 		for (Number n : samples) sorted.add(n.doubleValue());
 		Collections.sort(sorted);
 		if (size % 2 == 1) return sorted.get(size / 2);
 		double low = sorted.get(size / 2 - 1), high = sorted.get(size / 2);
 		return (low + high) / 2;
 	}
 	public static double getMean(Collection<? extends Number> samples) {
 		if (samples.isEmpty()) throw new IllegalArgumentException();
 		double sum = 0;
 		for (Number n : samples) sum += n.doubleValue();
 		return sum / samples.size();
 	}
 	public static double getVariance(Collection<? extends Number> samples) {
 		if (samples.size() < 2) throw new IllegalArgumentException();
 		double mean = getMean(samples);
 		double sumSquareDiff = 0;
 		for (Number n : samples) {
 			double diff = n.doubleValue() - mean;
 			sumSquareDiff += diff * diff;
 		}
 		return sumSquareDiff / (samples.size() - 1);
 	}
 	public static double getStandardDeviation(
 			Collection<? extends Number> samples) {
 		return Math.sqrt(getVariance(samples));
 	}
 }
--- a/bramble-core/build.gradle
+++ b/bramble-core/build.gradle
@@ -2,7 +2,6 @@ apply plugin: 'java-library'
 sourceCompatibility = 1.8
 targetCompatibility = 1.8
 apply plugin: 'ru.vyarus.animalsniffer'
 apply plugin: 'net.ltgt.apt'
 apply plugin: 'idea'
 apply plugin: 'witness'
@@ -10,15 +9,12 @@ apply plugin: 'witness'
 dependencies {
 	implementation project(path: ':bramble-api', configuration: 'default')
 	implementation 'com.madgag.spongycastle:core:1.58.0.0'
-	implementation 'com.h2database:h2:1.4.192' // The last version that supports Java 1.6
+	implementation 'com.h2database:h2:1.4.192' // This is the last version that supports Java 1.6
 	implementation 'org.bitlet:weupnp:0.1.4'
 	implementation 'net.i2p.crypto:eddsa:0.2.0'
 	implementation 'org.whispersystems:curve25519-java:0.4.1'
 	apt 'com.google.dagger:dagger-compiler:2.0.2'
 	testImplementation project(path: ':bramble-api', configuration: 'testOutput')
 	testImplementation 'org.hsqldb:hsqldb:2.3.5' // The last version that supports Java 1.6
 	testImplementation 'junit:junit:4.12'
 	testImplementation "org.jmock:jmock:2.8.2"
 	testImplementation "org.jmock:jmock-junit4:2.8.2"
@@ -27,13 +23,12 @@ dependencies {
 	testImplementation "org.hamcrest:hamcrest-core:1.3"
 	testApt 'com.google.dagger:dagger-compiler:2.0.2'
 	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-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',
@@ -42,25 +37,18 @@ dependencyVerification {
 			'com.madgag.spongycastle:core:1.58.0.0:core-1.58.0.0.jar:199617dd5698c5a9312b898c0a4cec7ce9dd8649d07f65d91629f58229d72728',
 			'javax.inject:javax.inject:1:javax.inject-1.jar:91c77044a50c481636c32d916fd89c9118a72195390452c81065080f957de7ff',
 			'junit:junit:4.12:junit-4.12.jar:59721f0805e223d84b90677887d9ff567dc534d7c502ca903c0c2b17f05c116a',
 			'net.i2p.crypto:eddsa:0.2.0:eddsa-0.2.0.jar:a7cb1b85c16e2f0730b9204106929a1d9aaae1df728adc7041a8b8b605692140',
 			'org.apache.ant:ant-launcher:1.9.4:ant-launcher-1.9.4.jar:7bccea20b41801ca17bcbc909a78c835d0f443f12d639c77bd6ae3d05861608d',
 			'org.apache.ant:ant:1.9.4:ant-1.9.4.jar:649ae0730251de07b8913f49286d46bba7b92d47c5f332610aa426c4f02161d8',
 			'org.beanshell:bsh:1.3.0:bsh-1.3.0.jar:9b04edc75d19db54f1b4e8b5355e9364384c6cf71eb0a1b9724c159d779879f8',
 			'org.bitlet:weupnp:0.1.4:weupnp-0.1.4.jar:88df7e6504929d00bdb832863761385c68ab92af945b04f0770b126270a444fb',
 			'org.codehaus.mojo.signature:java16:1.1:java16-1.1.signature:53799223a2c98dba2d0add810bed76315460df285c69e4f397ae6098f87dd619',
 			'org.codehaus.mojo:animal-sniffer-ant-tasks:1.16:animal-sniffer-ant-tasks-1.16.jar:890040976fbe2d584619a6a61b1fd2e925b3b5eb342a85eb2762c467c0d64e90',
 			'org.codehaus.mojo:animal-sniffer:1.16:animal-sniffer-1.16.jar:72be8bcc226ba43b937c722a08a07852bfa1b11400089265d5df0ee7b38b1d52',
 			'org.hamcrest:hamcrest-core:1.3:hamcrest-core-1.3.jar:66fdef91e9739348df7a096aa384a5685f4e875584cce89386a7a47251c4d8e9',
 			'org.hamcrest:hamcrest-library:1.3:hamcrest-library-1.3.jar:711d64522f9ec410983bd310934296da134be4254a125080a0416ec178dfad1c',
 			'org.hsqldb:hsqldb:2.3.5:hsqldb-2.3.5.jar:6676a6977ac98997a80f827ddbd3fe8ca1e0853dad1492512135fd1a222ccfad',
 			'org.jmock:jmock-junit4:2.8.2:jmock-junit4-2.8.2.jar:f7ee4df4f7bd7b7f1cafad3b99eb74d579f109d5992ff625347352edb55e674c',
 			'org.jmock:jmock-legacy:2.8.2:jmock-legacy-2.8.2.jar:f2b985a5c08a9edb7f37612330c058809da3f6a6d63ce792426ebf8ff0d6d31b',
 			'org.jmock:jmock-testjar:2.8.2:jmock-testjar-2.8.2.jar:8900860f72c474e027cf97fe78dcbf154a1aa7fc62b6845c5fb4e4f3c7bc8760',
 			'org.jmock:jmock:2.8.2:jmock-2.8.2.jar:6c73cb4a2e6dbfb61fd99c9a768539c170ab6568e57846bd60dbf19596b65b16',
 			'org.objenesis:objenesis:2.1:objenesis-2.1.jar:c74330cc6b806c804fd37e74487b4fe5d7c2750c5e15fbc6efa13bdee1bdef80',
 			'org.ow2.asm:asm-all:5.2:asm-all-5.2.jar:7fbffbc1db3422e2101689fd88df8384b15817b52b9b2b267b9f6d2511dc198d',
 			'org.ow2.asm:asm:5.0.4:asm-5.0.4.jar:896618ed8ae62702521a78bc7be42b7c491a08e6920a15f89a3ecdec31e9a220',
 			'org.whispersystems:curve25519-java:0.4.1:curve25519-java-0.4.1.jar:7dd659d8822c06c3aea1a47f18fac9e5761e29cab8100030b877db445005f03e',
 	]
 }
@@ -75,3 +63,8 @@ task jarTest(type: Jar, dependsOn: testClasses) {
 artifacts {
 	testOutput jarTest
 }
 // If a Java 6 JRE is available, check we're not using any Java 7 or 8 APIs
 tasks.withType(JavaCompile) {
 	useJava6StandardLibrary(it)
 }
--- a/bramble-core/src/main/java/org/briarproject/bramble/BrambleCoreEagerSingletons.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/BrambleCoreEagerSingletons.java
@@ -1,23 +1,21 @@
 package org.briarproject.bramble;
 import org.briarproject.bramble.contact.ContactModule;
-import org.briarproject.bramble.crypto.CryptoExecutorModule;
+import org.briarproject.bramble.crypto.CryptoModule;
 import org.briarproject.bramble.db.DatabaseExecutorModule;
 import org.briarproject.bramble.identity.IdentityModule;
 import org.briarproject.bramble.lifecycle.LifecycleModule;
 import org.briarproject.bramble.plugin.PluginModule;
 import org.briarproject.bramble.properties.PropertiesModule;
 import org.briarproject.bramble.reporting.ReportingModule;
 import org.briarproject.bramble.sync.SyncModule;
 import org.briarproject.bramble.system.SystemModule;
 import org.briarproject.bramble.transport.TransportModule;
 import org.briarproject.bramble.versioning.VersioningModule;
 public interface BrambleCoreEagerSingletons {
 	void inject(ContactModule.EagerSingletons init);
-	void inject(CryptoExecutorModule.EagerSingletons init);
+	void inject(CryptoModule.EagerSingletons init);
 	void inject(DatabaseExecutorModule.EagerSingletons init);
@@ -29,13 +27,9 @@ public interface BrambleCoreEagerSingletons {
 	void inject(PropertiesModule.EagerSingletons init);
 	void inject(ReportingModule.EagerSingletons init);
 	void inject(SyncModule.EagerSingletons init);
 	void inject(SystemModule.EagerSingletons init);
 	void inject(TransportModule.EagerSingletons init);
 	void inject(VersioningModule.EagerSingletons init);
 }
--- a/bramble-core/src/main/java/org/briarproject/bramble/BrambleCoreModule.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/BrambleCoreModule.java
@@ -2,7 +2,6 @@ package org.briarproject.bramble;
 import org.briarproject.bramble.client.ClientModule;
 import org.briarproject.bramble.contact.ContactModule;
 import org.briarproject.bramble.crypto.CryptoExecutorModule;
 import org.briarproject.bramble.crypto.CryptoModule;
 import org.briarproject.bramble.data.DataModule;
 import org.briarproject.bramble.db.DatabaseExecutorModule;
@@ -13,7 +12,6 @@ import org.briarproject.bramble.keyagreement.KeyAgreementModule;
 import org.briarproject.bramble.lifecycle.LifecycleModule;
 import org.briarproject.bramble.plugin.PluginModule;
 import org.briarproject.bramble.properties.PropertiesModule;
 import org.briarproject.bramble.record.RecordModule;
 import org.briarproject.bramble.reliability.ReliabilityModule;
 import org.briarproject.bramble.reporting.ReportingModule;
 import org.briarproject.bramble.settings.SettingsModule;
@@ -21,7 +19,6 @@ import org.briarproject.bramble.socks.SocksModule;
 import org.briarproject.bramble.sync.SyncModule;
 import org.briarproject.bramble.system.SystemModule;
 import org.briarproject.bramble.transport.TransportModule;
 import org.briarproject.bramble.versioning.VersioningModule;
 import dagger.Module;
@@ -29,7 +26,6 @@ import dagger.Module;
 		ClientModule.class,
 		ContactModule.class,
 		CryptoModule.class,
 		CryptoExecutorModule.class,
 		DataModule.class,
 		DatabaseModule.class,
 		DatabaseExecutorModule.class,
@@ -39,30 +35,26 @@ import dagger.Module;
 		LifecycleModule.class,
 		PluginModule.class,
 		PropertiesModule.class,
 		RecordModule.class,
 		ReliabilityModule.class,
 		ReportingModule.class,
 		SettingsModule.class,
 		SocksModule.class,
 		SyncModule.class,
 		SystemModule.class,
-		TransportModule.class,
+		TransportModule.class
 		VersioningModule.class
 })
 public class BrambleCoreModule {
 	public static void initEagerSingletons(BrambleCoreEagerSingletons c) {
 		c.inject(new ContactModule.EagerSingletons());
-		c.inject(new CryptoExecutorModule.EagerSingletons());
+		c.inject(new CryptoModule.EagerSingletons());
 		c.inject(new DatabaseExecutorModule.EagerSingletons());
 		c.inject(new IdentityModule.EagerSingletons());
 		c.inject(new LifecycleModule.EagerSingletons());
 		c.inject(new PluginModule.EagerSingletons());
 		c.inject(new PropertiesModule.EagerSingletons());
 		c.inject(new ReportingModule.EagerSingletons());
 		c.inject(new SyncModule.EagerSingletons());
 		c.inject(new SystemModule.EagerSingletons());
 		c.inject(new TransportModule.EagerSingletons());
 		c.inject(new VersioningModule.EagerSingletons());
 	}
 }
--- a/bramble-core/src/main/java/org/briarproject/bramble/client/ClientHelperImpl.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/client/ClientHelperImpl.java
@@ -15,11 +15,7 @@ import org.briarproject.bramble.api.db.DatabaseComponent;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.db.Metadata;
 import org.briarproject.bramble.api.db.Transaction;
 import org.briarproject.bramble.api.identity.Author;
 import org.briarproject.bramble.api.identity.AuthorFactory;
 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.MessageFactory;
@@ -36,14 +32,7 @@ import java.util.Map.Entry;
 import javax.annotation.concurrent.Immutable;
 import javax.inject.Inject;
 import static org.briarproject.bramble.api.identity.Author.FORMAT_VERSION;
 import static org.briarproject.bramble.api.identity.AuthorConstants.MAX_AUTHOR_NAME_LENGTH;
 import static org.briarproject.bramble.api.identity.AuthorConstants.MAX_PUBLIC_KEY_LENGTH;
 import static org.briarproject.bramble.api.properties.TransportPropertyConstants.MAX_PROPERTIES_PER_TRANSPORT;
 import static org.briarproject.bramble.api.properties.TransportPropertyConstants.MAX_PROPERTY_LENGTH;
 import static org.briarproject.bramble.api.sync.SyncConstants.MESSAGE_HEADER_LENGTH;
 import static org.briarproject.bramble.util.ValidationUtils.checkLength;
 import static org.briarproject.bramble.util.ValidationUtils.checkSize;
@Immutable
@NotNullByDefault
@@ -62,14 +51,12 @@ class ClientHelperImpl implements ClientHelper {
 	private final MetadataParser metadataParser;
 	private final MetadataEncoder metadataEncoder;
 	private final CryptoComponent crypto;
 	private final AuthorFactory authorFactory;
 	@Inject
 	ClientHelperImpl(DatabaseComponent db, MessageFactory messageFactory,
 			BdfReaderFactory bdfReaderFactory,
 			BdfWriterFactory bdfWriterFactory, MetadataParser metadataParser,
-			MetadataEncoder metadataEncoder, CryptoComponent crypto,
+			MetadataEncoder metadataEncoder, CryptoComponent crypto) {
 			AuthorFactory authorFactory) {
 		this.db = db;
 		this.messageFactory = messageFactory;
 		this.bdfReaderFactory = bdfReaderFactory;
@@ -77,7 +64,6 @@ class ClientHelperImpl implements ClientHelper {
 		this.metadataParser = metadataParser;
 		this.metadataEncoder = metadataEncoder;
 		this.crypto = crypto;
 		this.authorFactory = authorFactory;
 	}
 	@Override
@@ -328,20 +314,6 @@ class ClientHelperImpl implements ClientHelper {
 		}
 	}
 	@Override
 	public BdfDictionary toDictionary(TransportProperties transportProperties) {
 		return new BdfDictionary(transportProperties);
 	}
 	@Override
 	public BdfDictionary toDictionary(
 			Map<TransportId, TransportProperties> map) {
 		BdfDictionary d = new BdfDictionary();
 		for (Entry<TransportId, TransportProperties> e : map.entrySet())
 			d.put(e.getKey().getString(), new BdfDictionary(e.getValue()));
 		return d;
 	}
 	@Override
 	public BdfList toList(byte[] b, int off, int len) throws FormatException {
 		ByteArrayInputStream in = new ByteArrayInputStream(b, off, len);
@@ -369,11 +341,6 @@ class ClientHelperImpl implements ClientHelper {
 				raw.length - MESSAGE_HEADER_LENGTH);
 	}
 	@Override
 	public BdfList toList(Author a) {
 		return BdfList.of(a.getFormatVersion(), a.getName(), a.getPublicKey());
 	}
 	@Override
 	public byte[] sign(String label, BdfList toSign, byte[] privateKey)
 			throws FormatException, GeneralSecurityException {
@@ -381,53 +348,11 @@ class ClientHelperImpl implements ClientHelper {
 	}
 	@Override
-	public void verifySignature(byte[] signature, String label, BdfList signed,
+	public void verifySignature(String label, byte[] sig, byte[] publicKey,
-			byte[] publicKey) throws FormatException, GeneralSecurityException {
+			BdfList signed) throws FormatException, GeneralSecurityException {
-		if (!crypto.verifySignature(signature, label, toByteArray(signed),
+		if (!crypto.verify(label, toByteArray(signed), publicKey, sig)) {
 				publicKey)) {
 			throw new GeneralSecurityException("Invalid signature");
 		}
 	}
 	@Override
 	public Author parseAndValidateAuthor(BdfList author)
 			throws FormatException {
 		checkSize(author, 3);
 		int formatVersion = author.getLong(0).intValue();
 		if (formatVersion != FORMAT_VERSION) throw new FormatException();
 		String name = author.getString(1);
 		checkLength(name, 1, MAX_AUTHOR_NAME_LENGTH);
 		byte[] publicKey = author.getRaw(2);
 		checkLength(publicKey, 1, MAX_PUBLIC_KEY_LENGTH);
 		return authorFactory.createAuthor(formatVersion, name, publicKey);
 	}
 	@Override
 	public TransportProperties parseAndValidateTransportProperties(
 			BdfDictionary properties) throws FormatException {
 		checkSize(properties, 0, MAX_PROPERTIES_PER_TRANSPORT);
 		TransportProperties p = new TransportProperties();
 		for (String key : properties.keySet()) {
 			checkLength(key, 1, MAX_PROPERTY_LENGTH);
 			String value = properties.getString(key);
 			checkLength(value, 1, MAX_PROPERTY_LENGTH);
 			p.put(key, value);
 		}
 		return p;
 	}
 	@Override
 	public Map<TransportId, TransportProperties> parseAndValidateTransportPropertiesMap(
 			BdfDictionary properties) throws FormatException {
 		Map<TransportId, TransportProperties> tpMap = new HashMap<>();
 		for (String key : properties.keySet()) {
 			TransportId transportId = new TransportId(key);
 			TransportProperties transportProperties =
 					parseAndValidateTransportProperties(
 							properties.getDictionary(key));
 			tpMap.put(transportId, transportProperties);
 		}
 		return tpMap;
 	}
 }
--- a/bramble-core/src/main/java/org/briarproject/bramble/client/ClientModule.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/client/ClientModule.java
@@ -2,6 +2,14 @@ package org.briarproject.bramble.client;
 import org.briarproject.bramble.api.client.ClientHelper;
 import org.briarproject.bramble.api.client.ContactGroupFactory;
 import org.briarproject.bramble.api.crypto.CryptoComponent;
 import org.briarproject.bramble.api.data.BdfReaderFactory;
 import org.briarproject.bramble.api.data.BdfWriterFactory;
 import org.briarproject.bramble.api.data.MetadataEncoder;
 import org.briarproject.bramble.api.data.MetadataParser;
 import org.briarproject.bramble.api.db.DatabaseComponent;
 import org.briarproject.bramble.api.sync.GroupFactory;
 import org.briarproject.bramble.api.sync.MessageFactory;
 import dagger.Module;
 import dagger.Provides;
@@ -10,14 +18,19 @@ import dagger.Provides;
 public class ClientModule {
 	@Provides
-	ClientHelper provideClientHelper(ClientHelperImpl clientHelper) {
+	ClientHelper provideClientHelper(DatabaseComponent db,
-		return clientHelper;
+			MessageFactory messageFactory, BdfReaderFactory bdfReaderFactory,
 			BdfWriterFactory bdfWriterFactory, MetadataParser metadataParser,
 			MetadataEncoder metadataEncoder, CryptoComponent cryptoComponent) {
 		return new ClientHelperImpl(db, messageFactory, bdfReaderFactory,
 				bdfWriterFactory, metadataParser, metadataEncoder,
 				cryptoComponent);
 	}
 	@Provides
-	ContactGroupFactory provideContactGroupFactory(
+	ContactGroupFactory provideContactGroupFactory(GroupFactory groupFactory,
-			ContactGroupFactoryImpl contactGroupFactory) {
+			ClientHelper clientHelper) {
-		return contactGroupFactory;
+		return new ContactGroupFactoryImpl(groupFactory, clientHelper);
 	}
 }
--- a/bramble-core/src/main/java/org/briarproject/bramble/client/ContactGroupFactoryImpl.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/client/ContactGroupFactoryImpl.java
@@ -32,25 +32,23 @@ class ContactGroupFactoryImpl implements ContactGroupFactory {
 	}
 	@Override
-	public Group createLocalGroup(ClientId clientId, int majorVersion) {
+	public Group createLocalGroup(ClientId clientId) {
-		return groupFactory.createGroup(clientId, majorVersion,
+		return groupFactory.createGroup(clientId, LOCAL_GROUP_DESCRIPTOR);
 				LOCAL_GROUP_DESCRIPTOR);
 	}
 	@Override
-	public Group createContactGroup(ClientId clientId, int majorVersion,
+	public Group createContactGroup(ClientId clientId, Contact contact) {
 			Contact contact) {
 		AuthorId local = contact.getLocalAuthorId();
 		AuthorId remote = contact.getAuthor().getId();
 		byte[] descriptor = createGroupDescriptor(local, remote);
-		return groupFactory.createGroup(clientId, majorVersion, descriptor);
+		return groupFactory.createGroup(clientId, descriptor);
 	}
 	@Override
-	public Group createContactGroup(ClientId clientId, int majorVersion,
+	public Group createContactGroup(ClientId clientId, AuthorId authorId1,
-			AuthorId authorId1, AuthorId authorId2) {
+			AuthorId authorId2) {
 		byte[] descriptor = createGroupDescriptor(authorId1, authorId2);
-		return groupFactory.createGroup(clientId, majorVersion, descriptor);
+		return groupFactory.createGroup(clientId, descriptor);
 	}
 	private byte[] createGroupDescriptor(AuthorId local, AuthorId remote) {
--- a/bramble-core/src/main/java/org/briarproject/bramble/contact/ContactExchangeTaskImpl.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/contact/ContactExchangeTaskImpl.java
@@ -1,20 +1,23 @@
 package org.briarproject.bramble.contact;
 import org.briarproject.bramble.api.FormatException;
 import org.briarproject.bramble.api.client.ClientHelper;
 import org.briarproject.bramble.api.contact.ContactExchangeListener;
 import org.briarproject.bramble.api.contact.ContactExchangeTask;
 import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.contact.ContactManager;
 import org.briarproject.bramble.api.crypto.CryptoComponent;
 import org.briarproject.bramble.api.crypto.SecretKey;
 import org.briarproject.bramble.api.data.BdfDictionary;
 import org.briarproject.bramble.api.data.BdfList;
 import org.briarproject.bramble.api.data.BdfReader;
 import org.briarproject.bramble.api.data.BdfReaderFactory;
 import org.briarproject.bramble.api.data.BdfWriter;
 import org.briarproject.bramble.api.data.BdfWriterFactory;
 import org.briarproject.bramble.api.db.ContactExistsException;
 import org.briarproject.bramble.api.db.DatabaseComponent;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.db.Transaction;
 import org.briarproject.bramble.api.identity.Author;
 import org.briarproject.bramble.api.identity.AuthorFactory;
 import org.briarproject.bramble.api.identity.LocalAuthor;
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
@@ -23,31 +26,29 @@ import org.briarproject.bramble.api.plugin.TransportId;
 import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
 import org.briarproject.bramble.api.properties.TransportProperties;
 import org.briarproject.bramble.api.properties.TransportPropertyManager;
 import org.briarproject.bramble.api.record.Record;
 import org.briarproject.bramble.api.record.RecordReader;
 import org.briarproject.bramble.api.record.RecordReaderFactory;
 import org.briarproject.bramble.api.record.RecordWriter;
 import org.briarproject.bramble.api.record.RecordWriterFactory;
 import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.bramble.api.transport.StreamReaderFactory;
 import org.briarproject.bramble.api.transport.StreamWriter;
 import org.briarproject.bramble.api.transport.StreamWriterFactory;
 import java.io.EOFException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.security.GeneralSecurityException;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Map.Entry;
 import java.util.logging.Logger;
 import javax.inject.Inject;
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
-import static org.briarproject.bramble.api.contact.RecordTypes.CONTACT_INFO;
+import static org.briarproject.bramble.api.identity.AuthorConstants.MAX_AUTHOR_NAME_LENGTH;
 import static org.briarproject.bramble.api.identity.AuthorConstants.MAX_PUBLIC_KEY_LENGTH;
 import static org.briarproject.bramble.api.identity.AuthorConstants.MAX_SIGNATURE_LENGTH;
-import static org.briarproject.bramble.util.ValidationUtils.checkLength;
+import static org.briarproject.bramble.api.plugin.TransportId.MAX_TRANSPORT_ID_LENGTH;
-import static org.briarproject.bramble.util.ValidationUtils.checkSize;
+import static org.briarproject.bramble.api.properties.TransportPropertyConstants.MAX_PROPERTIES_PER_TRANSPORT;
 import static org.briarproject.bramble.api.properties.TransportPropertyConstants.MAX_PROPERTY_LENGTH;
@MethodsNotNullByDefault
@ParametersNotNullByDefault
@@ -60,9 +61,9 @@ class ContactExchangeTaskImpl extends Thread implements ContactExchangeTask {
 			"org.briarproject.briar.contact/EXCHANGE";
 	private final DatabaseComponent db;
-	private final ClientHelper clientHelper;
+	private final AuthorFactory authorFactory;
-	private final RecordReaderFactory recordReaderFactory;
+	private final BdfReaderFactory bdfReaderFactory;
-	private final RecordWriterFactory recordWriterFactory;
+	private final BdfWriterFactory bdfWriterFactory;
 	private final Clock clock;
 	private final ConnectionManager connectionManager;
 	private final ContactManager contactManager;
@@ -79,17 +80,17 @@ class ContactExchangeTaskImpl extends Thread implements ContactExchangeTask {
 	private volatile boolean alice;
 	@Inject
-	ContactExchangeTaskImpl(DatabaseComponent db, ClientHelper clientHelper,
+	ContactExchangeTaskImpl(DatabaseComponent db,
-			RecordReaderFactory recordReaderFactory,
+			AuthorFactory authorFactory, BdfReaderFactory bdfReaderFactory,
-			RecordWriterFactory recordWriterFactory, Clock clock,
+			BdfWriterFactory bdfWriterFactory, Clock clock,
 			ConnectionManager connectionManager, ContactManager contactManager,
 			TransportPropertyManager transportPropertyManager,
 			CryptoComponent crypto, StreamReaderFactory streamReaderFactory,
 			StreamWriterFactory streamWriterFactory) {
 		this.db = db;
-		this.clientHelper = clientHelper;
+		this.authorFactory = authorFactory;
-		this.recordReaderFactory = recordReaderFactory;
+		this.bdfReaderFactory = bdfReaderFactory;
-		this.recordWriterFactory = recordWriterFactory;
+		this.bdfWriterFactory = bdfWriterFactory;
 		this.clock = clock;
 		this.connectionManager = connectionManager;
 		this.contactManager = contactManager;
@@ -124,174 +125,184 @@ class ContactExchangeTaskImpl extends Thread implements ContactExchangeTask {
 		} catch (IOException e) {
 			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 			listener.contactExchangeFailed();
-			tryToClose(conn);
+			tryToClose(conn, true);
 			return;
 		}
 		// Get the local transport properties
-		Map<TransportId, TransportProperties> localProperties;
+		Map<TransportId, TransportProperties> localProperties, remoteProperties;
 		try {
 			localProperties = transportPropertyManager.getLocalProperties();
 		} catch (DbException e) {
 			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 			listener.contactExchangeFailed();
-			tryToClose(conn);
+			tryToClose(conn, true);
 			return;
 		}
 		// Derive the header keys for the transport streams
-		SecretKey aliceHeaderKey = crypto.deriveKey(ALICE_KEY_LABEL,
+		SecretKey aliceHeaderKey = crypto.deriveHeaderKey(masterSecret, true);
-				masterSecret, new byte[] {PROTOCOL_VERSION});
+		SecretKey bobHeaderKey = crypto.deriveHeaderKey(masterSecret, false);
 		SecretKey bobHeaderKey = crypto.deriveKey(BOB_KEY_LABEL, masterSecret,
 				new byte[] {PROTOCOL_VERSION});
 		// Create the readers
 		InputStream streamReader =
 				streamReaderFactory.createContactExchangeStreamReader(in,
 						alice ? bobHeaderKey : aliceHeaderKey);
-		RecordReader recordReader =
+		BdfReader r = bdfReaderFactory.createReader(streamReader);
 				recordReaderFactory.createRecordReader(streamReader);
 		// Create the writers
-		StreamWriter streamWriter =
+		OutputStream streamWriter =
 				streamWriterFactory.createContactExchangeStreamWriter(out,
 						alice ? aliceHeaderKey : bobHeaderKey);
-		RecordWriter recordWriter =
+		BdfWriter w = bdfWriterFactory.createWriter(streamWriter);
 				recordWriterFactory.createRecordWriter(streamWriter.getOutputStream());
 		// Derive the nonces to be signed
-		byte[] aliceNonce = crypto.mac(ALICE_NONCE_LABEL, masterSecret,
+		byte[] aliceNonce = crypto.deriveSignatureNonce(masterSecret, true);
-				new byte[] {PROTOCOL_VERSION});
+		byte[] bobNonce = crypto.deriveSignatureNonce(masterSecret, false);
 		byte[] bobNonce = crypto.mac(BOB_NONCE_LABEL, masterSecret,
 				new byte[] {PROTOCOL_VERSION});
 		byte[] localNonce = alice ? aliceNonce : bobNonce;
 		byte[] remoteNonce = alice ? bobNonce : aliceNonce;
-		// Sign the nonce
+		// Exchange pseudonyms, signed nonces, and timestamps
 		byte[] localSignature = sign(localAuthor, localNonce);
 		// Exchange contact info
 		long localTimestamp = clock.currentTimeMillis();
-		ContactInfo remoteInfo;
+		Author remoteAuthor;
 		long remoteTimestamp;
 		try {
 			if (alice) {
-				sendContactInfo(recordWriter, localAuthor, localProperties,
+				sendPseudonym(w, aliceNonce);
-						localSignature, localTimestamp);
+				sendTimestamp(w, localTimestamp);
-				recordWriter.flush();
+				sendTransportProperties(w, localProperties);
-				remoteInfo = receiveContactInfo(recordReader);
+				w.flush();
 				remoteAuthor = receivePseudonym(r, bobNonce);
 				remoteTimestamp = receiveTimestamp(r);
 				remoteProperties = receiveTransportProperties(r);
 			} else {
-				remoteInfo = receiveContactInfo(recordReader);
+				remoteAuthor = receivePseudonym(r, aliceNonce);
-				sendContactInfo(recordWriter, localAuthor, localProperties,
+				remoteTimestamp = receiveTimestamp(r);
-						localSignature, localTimestamp);
+				remoteProperties = receiveTransportProperties(r);
-				recordWriter.flush();
+				sendPseudonym(w, bobNonce);
 				sendTimestamp(w, localTimestamp);
 				sendTransportProperties(w, localProperties);
 				w.flush();
 			}
-			// Send EOF on the outgoing stream
+			// Close the outgoing stream and expect EOF on the incoming stream
-			streamWriter.sendEndOfStream();
+			w.close();
-			// Skip any remaining records from the incoming stream
+			if (!r.eof()) LOG.warning("Unexpected data at end of connection");
-			try {
+		} catch (GeneralSecurityException | IOException e) {
 				while (true) recordReader.readRecord();
 			} catch (EOFException expected) {
 				LOG.info("End of stream");
 			}
 		} catch (IOException e) {
 			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 			listener.contactExchangeFailed();
-			tryToClose(conn);
+			tryToClose(conn, true);
 			return;
 		}
 		// Verify the contact's signature
 		if (!verify(remoteInfo.author, remoteNonce, remoteInfo.signature)) {
 			LOG.warning("Invalid signature");
 			listener.contactExchangeFailed();
 			tryToClose(conn);
 			return;
 		}
 		// The agreed timestamp is the minimum of the peers' timestamps
-		long timestamp = Math.min(localTimestamp, remoteInfo.timestamp);
+		long timestamp = Math.min(localTimestamp, remoteTimestamp);
 		try {
 			// Add the contact
-			ContactId contactId = addContact(remoteInfo.author, timestamp,
+			ContactId contactId = addContact(remoteAuthor, masterSecret,
-					remoteInfo.properties);
+					timestamp, alice, remoteProperties);
 			// Reuse the connection as a transport connection
 			connectionManager.manageOutgoingConnection(contactId, transportId,
 					conn);
 			// Pseudonym exchange succeeded
 			LOG.info("Pseudonym exchange succeeded");
-			listener.contactExchangeSucceeded(remoteInfo.author);
+			listener.contactExchangeSucceeded(remoteAuthor);
 		} catch (ContactExistsException e) {
 			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
-			tryToClose(conn);
+			tryToClose(conn, true);
-			listener.duplicateContact(remoteInfo.author);
+			listener.duplicateContact(remoteAuthor);
 		} catch (DbException e) {
 			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
-			tryToClose(conn);
+			tryToClose(conn, true);
 			listener.contactExchangeFailed();
 		}
 	}
-	private byte[] sign(LocalAuthor author, byte[] nonce) {
+	private void sendPseudonym(BdfWriter w, byte[] nonce)
-		try {
+			throws GeneralSecurityException, IOException {
-			return crypto.sign(SIGNING_LABEL_EXCHANGE, nonce,
+		// Sign the nonce
-					author.getPrivateKey());
+		byte[] privateKey = localAuthor.getPrivateKey();
-		} catch (GeneralSecurityException e) {
+		byte[] sig = crypto.sign(SIGNING_LABEL_EXCHANGE, nonce, privateKey);
-			throw new AssertionError();
+
 		// Write the name, public key and signature
 		w.writeListStart();
 		w.writeString(localAuthor.getName());
 		w.writeRaw(localAuthor.getPublicKey());
 		w.writeRaw(sig);
 		w.writeListEnd();
 		LOG.info("Sent pseudonym");
 	}
 	private Author receivePseudonym(BdfReader r, byte[] nonce)
 			throws GeneralSecurityException, IOException {
 		// Read the name, public key and signature
 		r.readListStart();
 		String name = r.readString(MAX_AUTHOR_NAME_LENGTH);
 		byte[] publicKey = r.readRaw(MAX_PUBLIC_KEY_LENGTH);
 		byte[] sig = r.readRaw(MAX_SIGNATURE_LENGTH);
 		r.readListEnd();
 		LOG.info("Received pseudonym");
 		// Verify the signature
 		if (!crypto.verify(SIGNING_LABEL_EXCHANGE, nonce, publicKey, sig)) {
 			if (LOG.isLoggable(INFO))
 				LOG.info("Invalid signature");
 			throw new GeneralSecurityException();
 		}
 		return authorFactory.createAuthor(name, publicKey);
 	}
-	private boolean verify(Author author, byte[] nonce, byte[] signature) {
+	private void sendTimestamp(BdfWriter w, long timestamp)
 		try {
 			return crypto.verifySignature(signature, SIGNING_LABEL_EXCHANGE,
 					nonce, author.getPublicKey());
 		} catch (GeneralSecurityException e) {
 			return false;
 		}
 	}
 	private void sendContactInfo(RecordWriter recordWriter, Author author,
 			Map<TransportId, TransportProperties> properties, byte[] signature,
 			long timestamp) throws IOException {
 		BdfList authorList = clientHelper.toList(author);
 		BdfDictionary props = clientHelper.toDictionary(properties);
 		BdfList payload = BdfList.of(authorList, props, signature, timestamp);
 		recordWriter.writeRecord(new Record(PROTOCOL_VERSION, CONTACT_INFO,
 				clientHelper.toByteArray(payload)));
 		LOG.info("Sent contact info");
 	}
 	private ContactInfo receiveContactInfo(RecordReader recordReader)
 			throws IOException {
-		Record record;
+		w.writeLong(timestamp);
-		do {
+		LOG.info("Sent timestamp");
 			record = recordReader.readRecord();
 			if (record.getProtocolVersion() != PROTOCOL_VERSION)
 				throw new FormatException();
 		} while (record.getRecordType() != CONTACT_INFO);
 		LOG.info("Received contact info");
 		BdfList payload = clientHelper.toList(record.getPayload());
 		checkSize(payload, 4);
 		Author author = clientHelper.parseAndValidateAuthor(payload.getList(0));
 		BdfDictionary props = payload.getDictionary(1);
 		Map<TransportId, TransportProperties> properties =
 				clientHelper.parseAndValidateTransportPropertiesMap(props);
 		byte[] signature = payload.getRaw(2);
 		checkLength(signature, 1, MAX_SIGNATURE_LENGTH);
 		long timestamp = payload.getLong(3);
 		if (timestamp < 0) throw new FormatException();
 		return new ContactInfo(author, properties, signature, timestamp);
 	}
-	private ContactId addContact(Author remoteAuthor, long timestamp,
+	private long receiveTimestamp(BdfReader r) throws IOException {
 		long timestamp = r.readLong();
 		if (timestamp < 0) throw new FormatException();
 		LOG.info("Received timestamp");
 		return timestamp;
 	}
 	private void sendTransportProperties(BdfWriter w,
 			Map<TransportId, TransportProperties> local) throws IOException {
 		w.writeListStart();
 		for (Entry<TransportId, TransportProperties> e : local.entrySet())
 			w.writeList(BdfList.of(e.getKey().getString(), e.getValue()));
 		w.writeListEnd();
 	}
 	private Map<TransportId, TransportProperties> receiveTransportProperties(
 			BdfReader r) throws IOException {
 		Map<TransportId, TransportProperties> remote = new HashMap<>();
 		r.readListStart();
 		while (!r.hasListEnd()) {
 			r.readListStart();
 			String id = r.readString(MAX_TRANSPORT_ID_LENGTH);
 			if (id.isEmpty()) throw new FormatException();
 			TransportProperties p = new TransportProperties();
 			r.readDictionaryStart();
 			while (!r.hasDictionaryEnd()) {
 				if (p.size() == MAX_PROPERTIES_PER_TRANSPORT)
 					throw new FormatException();
 				String key = r.readString(MAX_PROPERTY_LENGTH);
 				String value = r.readString(MAX_PROPERTY_LENGTH);
 				p.put(key, value);
 			}
 			r.readDictionaryEnd();
 			r.readListEnd();
 			remote.put(new TransportId(id), p);
 		}
 		r.readListEnd();
 		return remote;
 	}
 	private ContactId addContact(Author remoteAuthor, SecretKey master,
 			long timestamp, boolean alice,
 			Map<TransportId, TransportProperties> remoteProperties)
 			throws DbException {
 		ContactId contactId;
 		Transaction txn = db.startTransaction(false);
 		try {
 			contactId = contactManager.addContact(txn, remoteAuthor,
-					localAuthor.getId(), masterSecret, timestamp, alice,
+					localAuthor.getId(), master, timestamp, alice, true, true);
 					true, true);
 			transportPropertyManager.addRemoteProperties(txn, contactId,
 					remoteProperties);
 			db.commitTransaction(txn);
@@ -301,30 +312,14 @@ class ContactExchangeTaskImpl extends Thread implements ContactExchangeTask {
 		return contactId;
 	}
-	private void tryToClose(DuplexTransportConnection conn) {
+	private void tryToClose(DuplexTransportConnection conn,
 			boolean exception) {
 		try {
 			LOG.info("Closing connection");
-			conn.getReader().dispose(true, true);
+			conn.getReader().dispose(exception, true);
-			conn.getWriter().dispose(true);
+			conn.getWriter().dispose(exception);
 		} catch (IOException e) {
 			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
 		}
 	}
 	private static class ContactInfo {
 		private final Author author;
 		private final Map<TransportId, TransportProperties> properties;
 		private final byte[] signature;
 		private final long timestamp;
 		private ContactInfo(Author author,
 				Map<TransportId, TransportProperties> properties,
 				byte[] signature, long timestamp) {
 			this.author = author;
 			this.properties = properties;
 			this.signature = signature;
 			this.timestamp = timestamp;
 		}
 	}
 }
--- a/bramble-core/src/main/java/org/briarproject/bramble/contact/ContactManagerImpl.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/contact/ContactManagerImpl.java
@@ -27,37 +27,36 @@ class ContactManagerImpl implements ContactManager {
 	private final DatabaseComponent db;
 	private final KeyManager keyManager;
-	private final List<ContactHook> hooks;
+	private final List<AddContactHook> addHooks;
 	private final List<RemoveContactHook> removeHooks;
 	@Inject
 	ContactManagerImpl(DatabaseComponent db, KeyManager keyManager) {
 		this.db = db;
 		this.keyManager = keyManager;
-		hooks = new CopyOnWriteArrayList<>();
+		addHooks = new CopyOnWriteArrayList<>();
 		removeHooks = new CopyOnWriteArrayList<>();
 	}
 	@Override
-	public void registerContactHook(ContactHook hook) {
+	public void registerAddContactHook(AddContactHook hook) {
-		hooks.add(hook);
+		addHooks.add(hook);
 	}
 	@Override
 	public void registerRemoveContactHook(RemoveContactHook hook) {
 		removeHooks.add(hook);
 	}
 	@Override
 	public ContactId addContact(Transaction txn, Author remote, AuthorId local,
-			SecretKey master, long timestamp, boolean alice, boolean verified,
+			SecretKey master,long timestamp, boolean alice, boolean verified,
 			boolean active) throws DbException {
 		ContactId c = db.addContact(txn, remote, local, verified, active);
-		keyManager.addContact(txn, c, master, timestamp, alice, active);
+		keyManager.addContact(txn, c, master, timestamp, alice);
 		Contact contact = db.getContact(txn, c);
-		for (ContactHook hook : hooks) hook.addingContact(txn, contact);
+		for (AddContactHook hook : addHooks)
-		return c;
+			hook.addingContact(txn, contact);
 	}
 	@Override
 	public ContactId addContact(Transaction txn, Author remote, AuthorId local,
 			boolean verified, boolean active) throws DbException {
 		ContactId c = db.addContact(txn, remote, local, verified, active);
 		Contact contact = db.getContact(txn, c);
 		for (ContactHook hook : hooks) hook.addingContact(txn, contact);
 		return c;
 	}
@@ -157,7 +156,7 @@ class ContactManagerImpl implements ContactManager {
 	@Override
 	public boolean contactExists(AuthorId remoteAuthorId,
 			AuthorId localAuthorId) throws DbException {
-		boolean exists;
+		boolean exists = false;
 		Transaction txn = db.startTransaction(true);
 		try {
 			exists = contactExists(txn, remoteAuthorId, localAuthorId);
@@ -172,7 +171,8 @@ class ContactManagerImpl implements ContactManager {
 	public void removeContact(Transaction txn, ContactId c)
 			throws DbException {
 		Contact contact = db.getContact(txn, c);
-		for (ContactHook hook : hooks) hook.removingContact(txn, contact);
+		for (RemoveContactHook hook : removeHooks)
 			hook.removingContact(txn, contact);
 		db.removeContact(txn, c);
 	}
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
akwizgran	9902c023ca	Bump version number for beta release.	2017-12-01 16:30:18 +00:00
akwizgran	e8baee6734	Specify 7 characters for Git revision. (cherry picked from commit `f0d8532`)	2017-12-01 16:29:45 +00:00
akwizgran	74e3fee7aa	Merge branch '1124-notification-channel-crash-beta' into 'maintenance-0.16' Beta: Use NotificationChannel for foreground service to avoid crash on Android 8.1 See merge request !635	2017-12-01 16:00:53 +00:00
Torsten Grote	05aac696b7	Use NotificationChannel for foreground service to avoid crash on Android 8.1 This also seems to address #1075 at least on an emulator	2017-12-01 13:47:02 -02:00