diff -r 000000000000 -r 6474c204b198 mobile/android/base/fxa/login/TokensAndKeysState.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mobile/android/base/fxa/login/TokensAndKeysState.java	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,41 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.gecko.fxa.login;
+
+import org.mozilla.gecko.browserid.BrowserIDKeyPair;
+import org.mozilla.gecko.sync.ExtendedJSONObject;
+import org.mozilla.gecko.sync.Utils;
+
+public abstract class TokensAndKeysState extends State {
+  protected final byte[] sessionToken;
+  protected final byte[] kA;
+  protected final byte[] kB;
+  protected final BrowserIDKeyPair keyPair;
+
+  public TokensAndKeysState(StateLabel stateLabel, String email, String uid, byte[] sessionToken, byte[] kA, byte[] kB, BrowserIDKeyPair keyPair) {
+    super(stateLabel, email, uid, true);
+    Utils.throwIfNull(sessionToken, kA, kB, keyPair);
+    this.sessionToken = sessionToken;
+    this.kA = kA;
+    this.kB = kB;
+    this.keyPair = keyPair;
+  }
+
+  @Override
+  public ExtendedJSONObject toJSONObject() {
+    ExtendedJSONObject o = super.toJSONObject();
+    // Fields are non-null by constructor.
+    o.put("sessionToken", Utils.byte2Hex(sessionToken));
+    o.put("kA", Utils.byte2Hex(kA));
+    o.put("kB", Utils.byte2Hex(kB));
+    o.put("keyPair", keyPair.toJSONObject());
+    return o;
+  }
+
+  @Override
+  public Action getNeededAction() {
+    return Action.None;
+  }
+}