/* * 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 TransitedEncoding type. * * <xmp> *  TransitedEncoding      ::= SEQUENCE { *         tr-type         [0] Int32 -- must be registered --, *         contents        [1] OCTET STRING *  } * </xmp> * * <p> * This definition reflects the Network Working Group RFC 4120 * specification available at * <a href="http://www.ietf.org/rfc/rfc4120.txt"> * http://www.ietf.org/rfc/rfc4120.txt</a>. */ public class TransitedEncoding {    public int trType;    public byte[] contents;     public TransitedEncoding(int type, byte[] cont) {        trType = type;        contents = cont;    }     /**     * Constructs a TransitedEncoding 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 TransitedEncoding(DerValue encoding) throws Asn1Exception, IOException {        if (encoding.getTag() != DerValue.tag_Sequence) {            throw new Asn1Exception(Krb5.ASN1_BAD_ID);        }        DerValue der;        der = encoding.getData().getDerValue();        if ((der.getTag() & 0x1F) == 0x00) {            trType = der.getData().getBigInteger().intValue();        }        else            throw new Asn1Exception(Krb5.ASN1_BAD_ID);        der = encoding.getData().getDerValue();         if ((der.getTag() & 0x1F) == 0x01) {            contents = der.getData().getOctetString();        }        else            throw new Asn1Exception(Krb5.ASN1_BAD_ID);        if (der.getData().available() > 0)            throw new Asn1Exception(Krb5.ASN1_BAD_ID);    }     /**     * Encodes a TransitedEncoding object.     * @return the byte array of the encoded TransitedEncoding 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(trType));        bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x00), temp);        temp = new DerOutputStream();        temp.putOctetString(contents);        bytes.write(DerValue.createTag(DerValue.TAG_CONTEXT, true, (byte)0x01), temp);        temp = new DerOutputStream();        temp.write(DerValue.tag_Sequence, bytes);        return temp.toByteArray();    }     /**     * Parse (unmarshal) a TransitedEncoding object from a DER input stream.  This form     * parsing might be used when expanding a value which is part of     * a constructed sequence and uses explicitly tagged type.     *     * @exception Asn1Exception on error.     * @param data the Der input stream value, which contains one or more marshaled value.     * @param explicitTag tag number.     * @param optional indicate if this data field is optional     * @return an instance of TransitedEncoding.     *     */    public static TransitedEncoding parse(DerInputStream data, byte explicitTag, boolean optional) throws Asn1Exception, IOException {        if ((optional) && (((byte)data.peekByte() & (byte)0x1F) != explicitTag))            return null;        DerValue der = data.getDerValue();        if (explicitTag != (der.getTag() & (byte)0x1F))  {            throw new Asn1Exception(Krb5.ASN1_BAD_ID);        }        else {            DerValue subDer = der.getData().getDerValue();            return new TransitedEncoding(subDer);        }    }}