--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.security.jgss/share/classes/sun/security/krb5/internal/MethodData.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,111 @@
+/*
+ * 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.
+ */
+
+/*
+ *
+ *  (C) Copyright IBM Corp. 1999 All Rights Reserved.
+ *  Copyright 1997 The Open Group Research Institute.  All rights reserved.
+ */
+
+package sun.security.krb5.internal;
+
+import sun.security.util.*;
+import sun.security.krb5.Asn1Exception;
+import java.io.IOException;
+import java.math.BigInteger;
+
+/**
+ * Implements the ASN.1 EncKrbPrivPart type.
+ *
+ * <pre>{@code
+ *     METHOD-DATA ::=    SEQUENCE {
+ *                        method-type[0]   INTEGER,
+ *                        method-data[1]   OCTET STRING OPTIONAL
+ *  }
+ * }</pre>
+ */
+public class MethodData {
+    private int methodType;
+    private byte[] methodData = null; //optional
+
+    public MethodData(int type, byte[] data) {
+        methodType = type;
+        if (data != null) {
+            methodData = data.clone();
+        }
+    }
+
+    /**
+     * Constructs a MethodData object.
+     * @param encoding a Der-encoded data.
+     * @exception Asn1Exception if an error occurs while decoding an ASN1 encoded data.
+     * @exception IOException if an I/O error occurs while reading encoded data.
+     */
+    public MethodData(DerValue encoding) throws Asn1Exception, IOException {
+        DerValue der;
+        if (encoding.getTag() != DerValue.tag_Sequence) {
+            throw new Asn1Exception(Krb5.ASN1_BAD_ID);
+        }
+        der = encoding.getData().getDerValue();
+        if ((der.getTag() & 0x1F) == 0x00) {
+            BigInteger bint = der.getData().getBigInteger();
+            methodType = bint.intValue();
+        }
+        else
+            throw new Asn1Exception(Krb5.ASN1_BAD_ID);
+        if (encoding.getData().available() > 0) {
+            der = encoding.getData().getDerValue();
+            if ((der.getTag() & 0x1F) == 0x01) {
+                methodData = der.getData().getOctetString();
+            }
+            else throw new Asn1Exception(Krb5.ASN1_BAD_ID);
+        }
+        if (encoding.getData().available() > 0)
+            throw new Asn1Exception(Krb5.ASN1_BAD_ID);
+    }
+
+    /**
+     * Encodes an MethodData object.
+     * @return the byte array of encoded MethodData object.
+     * @exception Asn1Exception if an error occurs while decoding an ASN1 encoded data.
+     * @exception IOException if an I/O error occurs while reading encoded data.
+     */
+
+    public byte[] asn1Encode() throws Asn1Exception, IOException {
+        DerOutputStream bytes = new DerOutputStream();
+        DerOutputStream temp = new DerOutputStream();
+        temp.putInteger(BigInteger.valueOf(methodType));
+        bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x00), temp);
+        if (methodData != null) {
+            temp = new DerOutputStream();
+            temp.putOctetString(methodData);
+            bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x01), temp);
+        }
+
+        temp = new DerOutputStream();
+        temp.write(DerValue.tag_Sequence, bytes);
+        return temp.toByteArray();
+    }
+
+}