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 20:14:59 +0200 (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 }