/* * 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. * * <xmp> *     METHOD-DATA ::=    SEQUENCE { *                        method-type[0]   INTEGER, *                        method-data[1]   OCTET STRING OPTIONAL *  } * </xmp> */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();    } }