--- /dev/null	2018-02-28 15:06:04.760000000 -0500
+++ new/src/java.base/share/classes/java/security/interfaces/XECPrivateKey.java	2018-03-09 11:19:23.458014000 -0500
@@ -0,0 +1,52 @@
+/*
+ * 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.security.PrivateKey;
+import java.util.Optional;
+
+/**
+ * An XEC private key is an encoded scalar value as described in RFC 7748.
+ * The decoding procedure defined in this RFC includes an operation that forces
+ * certain bits of the key to either 1 or 0. This operation is known as
+ * "pruning" or "clamping" the private key. Arrays returned by this interface
+ * are unpruned, and implementations will need to prune the array before
+ * using it in any numerical operations.
+ *
+ * @since 11
+ */
+public interface XECPrivateKey extends XECKey, PrivateKey {
+
+    /**
+     * Get the scalar value encoded as an unpruned byte array. A new copy of
+     * the array is returned each time this method is called.
+     *
+     * @return the unpruned encoded scalar value, or an empty Optional if the
+     *     scalar cannot be extracted (e.g. if the provider is a hardware token
+     *     and the private key is not allowed to leave the crypto boundary). 
+     */
+    Optional<byte[]> getScalar();
+}
+