--- /dev/null	2018-02-28 15:06:04.760000000 -0500
+++ new/src/java.base/share/classes/java/security/interfaces/XECPublicKey.java	2018-03-09 11:19:24.454014000 -0500
@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package java.security.interfaces;
+
+import java.math.BigInteger;
+import java.security.PublicKey;
+
+/**
+ * An XEC public key is a particular point on the curve, which is represented
+ * using only its u-coordinate as described in RFC 7748. A u-coordinate is an
+ * element of the field of integers modulo some value that is determined by
+ * the algorithm parameters. This field element is represented by a BigInteger
+ * which may hold any value. That is, the BigInteger is not restricted to the
+ * range of canonical field elements.
+ *
+ * @since 11
+ */
+public interface XECPublicKey extends XECKey, PublicKey {
+
+    /**
+     * Get the u coordinate of the point.
+     *
+     * @return the u-coordinate, represented using a BigInteger which may hold
+     *          any value
+     */
+    BigInteger getU();
+
+}
+