diff -r 000000000000 -r 6474c204b198 mobile/android/base/browserid/VerifyingPublicKey.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mobile/android/base/browserid/VerifyingPublicKey.java	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,34 @@
+/* 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.browserid;
+
+import java.security.GeneralSecurityException;
+
+import org.mozilla.gecko.sync.ExtendedJSONObject;
+
+
+public interface VerifyingPublicKey {
+  /**
+   * Generate a JSON representation of a public key.
+   *
+   * @param publicKey
+   *          to represent.
+   * @return JSON representation.
+   */
+  public ExtendedJSONObject toJSONObject();
+
+  /**
+   * Verify a signature.
+   *
+   * @param message
+   *          to verify signature of.
+   * @param signature
+   *          to verify.
+   * @return true if signature is a signature of message produced by the private
+   *         key corresponding to this public key.
+   * @throws GeneralSecurityException
+   */
+  public boolean verifyMessage(byte[] message, byte[] signature) throws GeneralSecurityException;
+}