Merge branch '117-qr-contacts' into 'master'

BQP with QR codes

This MR implements BQP for key agreement over short-range transports. It also implements the Android UI for using BQP with QR codes.

Closes #117.

See merge request !84

briar-api/src/org/briarproject/api/event/KeyAgreementAbortedEvent.java

@@ -0,0 +1,15 @@
+package org.briarproject.api.event;
+
+/** An event that is broadcast when a BQP protocol aborts. */
+public class KeyAgreementAbortedEvent extends Event {
+
+	private final boolean remoteAborted;
+
+	public KeyAgreementAbortedEvent(boolean remoteAborted) {
+		this.remoteAborted = remoteAborted;
+	}
+
+	public boolean didRemoteAbort() {
+		return remoteAborted;
+	}
+}

briar-api/src/org/briarproject/api/event/KeyAgreementFailedEvent.java

@@ -0,0 +1,6 @@
+package org.briarproject.api.event;
+
+/** An event that is broadcast when a BQP connection cannot be created. */
+public class KeyAgreementFailedEvent extends Event {
+
+}

briar-api/src/org/briarproject/api/event/KeyAgreementFinishedEvent.java

@@ -0,0 +1,17 @@
+package org.briarproject.api.event;
+
+import org.briarproject.api.keyagreement.KeyAgreementResult;
+
+/** An event that is broadcast when a BQP protocol completes. */
+public class KeyAgreementFinishedEvent extends Event {
+
+	private final KeyAgreementResult result;
+
+	public KeyAgreementFinishedEvent(KeyAgreementResult result) {
+		this.result = result;
+	}
+
+	public KeyAgreementResult getResult() {
+		return result;
+	}
+}

briar-api/src/org/briarproject/api/event/KeyAgreementListeningEvent.java

@@ -0,0 +1,17 @@
+package org.briarproject.api.event;
+
+import org.briarproject.api.keyagreement.Payload;
+
+/** An event that is broadcast when a BQP task is listening. */
+public class KeyAgreementListeningEvent extends Event {
+
+	private final Payload localPayload;
+
+	public KeyAgreementListeningEvent(Payload localPayload) {
+		this.localPayload = localPayload;
+	}
+
+	public Payload getLocalPayload() {
+		return localPayload;
+	}
+}

briar-api/src/org/briarproject/api/event/KeyAgreementStartedEvent.java

@@ -0,0 +1,6 @@
+package org.briarproject.api.event;
+
+/** An event that is broadcast when a BQP protocol completes. */
+public class KeyAgreementStartedEvent extends Event {
+
+}

briar-api/src/org/briarproject/api/event/KeyAgreementWaitingEvent.java

@@ -0,0 +1,9 @@
+package org.briarproject.api.event;
+
+/**
+ * An event that is broadcast when a BQP protocol is waiting on the remote
+ * peer to start.
+ */
+public class KeyAgreementWaitingEvent extends Event {
+
+}