--- /dev/null	Fri May 29 00:48:50 2015
+++ new/src/java.base/share/classes/sun/security/ssl/HelloCookieManager.java	Fri May 29 00:48:48 2015
@@ -0,0 +1,144 @@
+/*
+ * Copyright (c) 2015, 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.ssl;
+
+import java.io.IOException;
+import javax.net.ssl.SSLProtocolException;
+import java.security.MessageDigest;
+import java.security.SecureRandom;
+
+import sun.security.ssl.HandshakeMessage.ClientHello;
+
+/*
+ * HelloVerifyRequest cookie manager
+ */
+final class HelloCookieManager {
+    // the cookie secret life time
+    private static long COOKIE_TIMING_WINDOW = 3600000;     // in milliseconds
+    private static int  COOKIE_MAX_LENGTH_DTLS10 = 32;      // 32 bytes
+    private static int  COOKIE_MAX_LENGTH_DTLS12 = 0xFF;    // 2^8 -1 bytes
+
+    private final SecureRandom          secureRandom;
+    private final MessageDigest         cookieDigest;
+
+    private int                         cookieVersion;      // allow to wrap
+    private long                        secretLifetime;
+    private byte[]                      cookieSecret;
+
+    private int                         prevCookieVersion;
+    private byte[]                      prevCookieSecret;
+
+    HelloCookieManager(SecureRandom secureRandom) {
+        this.secureRandom = secureRandom;
+        this.cookieDigest = JsseJce.getMessageDigest("SHA-256");
+
+        this.cookieVersion = secureRandom.nextInt();
+        this.secretLifetime = 0;
+        this.cookieSecret = null;
+
+        this.prevCookieVersion = 0;
+        this.prevCookieSecret = null;
+    }
+
+    // Used by server side to generate cookies in HelloVerifyRequest message.
+    synchronized byte[] getCookie(ClientHello clientHelloMsg) {
+        if (secretLifetime < System.currentTimeMillis()) {
+            if (cookieSecret != null) {
+                prevCookieVersion = cookieVersion;
+                prevCookieSecret = cookieSecret.clone();
+            } else {
+                cookieSecret = new byte[32];
+            }
+
+            cookieVersion++;
+            secureRandom.nextBytes(cookieSecret);
+            secretLifetime = System.currentTimeMillis() + COOKIE_TIMING_WINDOW;
+        }
+
+        clientHelloMsg.updateHelloCookie(cookieDigest);
+        byte[] cookie = cookieDigest.digest(cookieSecret);      // 32 bytes
+        cookie[0] = (byte)((cookieVersion >> 24) & 0xFF);
+        cookie[1] = (byte)((cookieVersion >> 16) & 0xFF);
+        cookie[2] = (byte)((cookieVersion >> 8) & 0xFF);
+        cookie[3] = (byte)(cookieVersion & 0xFF);
+
+        return cookie;
+    }
+
+    // Used by server side to check the cookie in ClientHello message.
+    synchronized boolean isValid(ClientHello clientHelloMsg) {
+        byte[] cookie = clientHelloMsg.cookie;
+
+        // no cookie exchange or not a valid cookie length
+        if ((cookie == null) || (cookie.length != 32)) {
+            return false;
+        }
+
+        int version = ((cookie[0] & 0xFF) << 24) |
+                      ((cookie[1] & 0xFF) << 16) |
+                      ((cookie[2] & 0xFF) << 8) |
+                       (cookie[3] & 0xFF);
+
+        byte[] secret;
+        if (version == cookieVersion) {
+            secret = cookieSecret;
+        } else if (version == prevCookieVersion) {
+            secret = prevCookieSecret;
+        } else {
+            return false;       // may be out of the timing window
+        }
+
+        clientHelloMsg.updateHelloCookie(cookieDigest);
+        byte[] target = cookieDigest.digest(secret);            // 32 bytes
+
+        for (int i = 4; i < 32; i++) {
+            if (cookie[i] != target[i]) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    // Used by client side to check the cookie in HelloVerifyRequest message.
+    static void checkCookie(ProtocolVersion protocolVersion,
+            byte[] cookie) throws IOException {
+        if (cookie != null && cookie.length != 0) {
+            int limit = COOKIE_MAX_LENGTH_DTLS12;
+            if (protocolVersion.v == ProtocolVersion.DTLS10.v) {
+                limit = COOKIE_MAX_LENGTH_DTLS10;
+            }
+
+            if (cookie.length > COOKIE_MAX_LENGTH_DTLS10) {
+                throw new SSLProtocolException(
+                        "Invalid HelloVerifyRequest.cookie (length = " +
+                         cookie.length + " bytes)");
+            }
+        }
+
+        // Otherwise, no cookie exchange.
+    }
+}