--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/java.base/share/classes/sun/security/provider/EntropySource.java	Fri May 06 11:38:44 2016 +0800
@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2016, 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 sun.security.provider;
+
+/**
+ * An interface of a source of entropy input.
+ *
+ * @since 9
+ */
+public interface EntropySource {
+    /**
+     * Returns a byte array containing entropy.
+     * <p>
+     * This maps to the {@code Get_entropy_input} function defined in
+     * Section 9 of NIST SP 800-90Ar1.
+     *
+     * @param minEntropy minimum entropy required, in bytes
+     * @param minLength minimum length of output, in bytes
+     * @param maxLength maximum length of output, in bytes
+     * @param pr whether prediction resistance is required
+     * @return the byte array containing entropy
+     */
+    byte[] getEntropy(int minEntropy, int minLength, int maxLength, boolean pr);
+}