--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.security.jgss/share/classes/sun/security/krb5/internal/crypto/HmacSha2Aes256CksumType.java	Mon Jan 22 12:00:41 2018 +0800
@@ -0,0 +1,110 @@
+/*
+ * Copyright (c) 2017, 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.krb5.internal.crypto;
+
+import sun.security.krb5.Checksum;
+import sun.security.krb5.KrbCryptoException;
+import sun.security.krb5.internal.*;
+import java.security.GeneralSecurityException;
+
+/*
+ * This class encapsulates the checksum type for aes256-cts-sha384
+ */
+
+public class HmacSha2Aes256CksumType extends CksumType {
+
+    public HmacSha2Aes256CksumType() {
+    }
+
+    public int confounderSize() {
+        return 16;
+    }
+
+    public int cksumType() {
+        return Checksum.CKSUMTYPE_HMAC_SHA384_192_AES256;
+    }
+
+    public boolean isSafe() {
+        return true;
+    }
+
+    public int cksumSize() {
+        return 24;  // bytes
+    }
+
+    public int keyType() {
+        return Krb5.KEYTYPE_AES;
+    }
+
+    public int keySize() {
+        return 32;   // bytes
+    }
+
+    public byte[] calculateChecksum(byte[] data, int size) {
+        return null;
+    }
+
+    /**
+     * Calculates keyed checksum.
+     * @param data the data used to generate the checksum.
+     * @param size length of the data.
+     * @param key the key used to encrypt the checksum.
+     * @return keyed checksum.
+     */
+    public byte[] calculateKeyedChecksum(byte[] data, int size, byte[] key,
+        int usage) throws KrbCryptoException {
+
+         try {
+            return Aes256Sha2.calculateChecksum(key, usage, data, 0, size);
+         } catch (GeneralSecurityException e) {
+            KrbCryptoException ke = new KrbCryptoException(e.getMessage());
+            ke.initCause(e);
+            throw ke;
+         }
+    }
+
+    /**
+     * Verifies keyed checksum.
+     * @param data the data.
+     * @param size the length of data.
+     * @param key the key used to encrypt the checksum.
+     * @param checksum the checksum.
+     * @return true if verification is successful.
+     */
+    public boolean verifyKeyedChecksum(byte[] data, int size,
+        byte[] key, byte[] checksum, int usage) throws KrbCryptoException {
+
+         try {
+            byte[] newCksum = Aes256Sha2.calculateChecksum(key, usage, data,
+                                                        0, size);
+            return isChecksumEqual(checksum, newCksum);
+         } catch (GeneralSecurityException e) {
+            KrbCryptoException ke = new KrbCryptoException(e.getMessage());
+            ke.initCause(e);
+            throw ke;
+         }
+    }
+}