001    /*
002     *  Licensed to the Apache Software Foundation (ASF) under one
003     *  or more contributor license agreements.  See the NOTICE file
004     *  distributed with this work for additional information
005     *  regarding copyright ownership.  The ASF licenses this file
006     *  to you under the Apache License, Version 2.0 (the
007     *  "License"); you may not use this file except in compliance
008     *  with the License.  You may obtain a copy of the License at
009     *  
010     *    http://www.apache.org/licenses/LICENSE-2.0
011     *  
012     *  Unless required by applicable law or agreed to in writing,
013     *  software distributed under the License is distributed on an
014     *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015     *  KIND, either express or implied.  See the License for the
016     *  specific language governing permissions and limitations
017     *  under the License. 
018     *  
019     */
020    package org.apache.directory.server.kerberos.shared.io.encoder;
021    
022    
023    import java.io.ByteArrayOutputStream;
024    import java.io.IOException;
025    
026    import org.apache.directory.server.kerberos.shared.messages.components.Ticket;
027    import org.apache.directory.shared.asn1.der.ASN1OutputStream;
028    import org.apache.directory.shared.asn1.der.DERApplicationSpecific;
029    import org.apache.directory.shared.asn1.der.DERGeneralString;
030    import org.apache.directory.shared.asn1.der.DERInteger;
031    import org.apache.directory.shared.asn1.der.DERSequence;
032    import org.apache.directory.shared.asn1.der.DERTaggedObject;
033    
034    
035    /**
036     * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
037     * @version $Rev: 589780 $, $Date: 2007-10-29 19:14:59 +0100 (Mon, 29 Oct 2007) $
038     */
039    public class TicketEncoder
040    {
041        /**
042         * Encodes a {@link Ticket} into a its ASN.1 DER encoding.
043         * 
044         * @param ticket
045         * @return The byte[] containing the ASN.1 DER encoding of the {@link Ticket}.
046         * @throws IOException
047         */
048        public static byte[] encodeTicket( Ticket ticket ) throws IOException
049        {
050            ByteArrayOutputStream baos = new ByteArrayOutputStream();
051            ASN1OutputStream aos = new ASN1OutputStream( baos );
052    
053            aos.writeObject( encode( ticket ) );
054            aos.close();
055    
056            return baos.toByteArray();
057        }
058    
059    
060        /**
061         * Ticket ::=                    [APPLICATION 1] SEQUENCE {
062         *     tkt-vno[0]                   INTEGER,
063         *     realm[1]                     Realm,
064         *     sname[2]                     PrincipalName,
065         *     enc-part[3]                  EncryptedData
066         * }
067         */
068        protected static DERApplicationSpecific encode( Ticket ticket )
069        {
070            DERSequence vector = new DERSequence();
071    
072            vector.add( new DERTaggedObject( 0, DERInteger.valueOf( ticket.getTktVno() ) ) );
073            vector.add( new DERTaggedObject( 1, DERGeneralString.valueOf( ticket.getRealm() ) ) );
074            vector.add( new DERTaggedObject( 2, PrincipalNameEncoder.encode( ticket.getSName() ) ) );
075            vector.add( new DERTaggedObject( 3, EncryptedDataEncoder.encodeSequence( ticket.getEncPart() ) ) );
076    
077            DERApplicationSpecific ticketSequence = null;
078    
079            try
080            {
081                ticketSequence = DERApplicationSpecific.valueOf( 1, vector );
082            }
083            catch ( Exception e )
084            {
085                e.printStackTrace();
086            }
087    
088            return ticketSequence;
089        }
090    
091    
092        protected static DERSequence encodeSequence( Ticket[] tickets )
093        {
094            DERSequence outerVector = new DERSequence();
095    
096            for ( int ii = 0; ii < tickets.length; ii++ )
097            {
098                DERSequence vector = new DERSequence();
099                vector.add( encode( tickets[ii] ) );
100                outerVector.add( vector );
101            }
102    
103            return outerVector;
104        }
105    }