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.ApplicationRequest;
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.DERBitString;
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: 540371 $, $Date: 2007-05-21 17:00:43 -0700 (Mon, 21 May 2007) $
038 */
039 public class ApplicationRequestEncoder
040 {
041 /**
042 * Application code constant for the {@link ApplicationRequest} (14).
043 */
044 public static final int APPLICATION_CODE = 14;
045
046
047 /**
048 * Encodes an {@link ApplicationRequest} into a byte array.
049 *
050 * @param request
051 * @return The byte array.
052 * @throws IOException
053 */
054 public byte[] encode( ApplicationRequest request ) throws IOException
055 {
056 ByteArrayOutputStream baos = new ByteArrayOutputStream();
057 ASN1OutputStream aos = new ASN1OutputStream( baos );
058
059 DERSequence requestSequence = encodeReplySequence( request );
060 aos.writeObject( DERApplicationSpecific.valueOf( APPLICATION_CODE, requestSequence ) );
061 aos.close();
062
063 return baos.toByteArray();
064 }
065
066
067 /*
068 AP-REQ ::= [APPLICATION 14] SEQUENCE {
069 pvno[0] INTEGER,
070 msg-type[1] INTEGER,
071 ap-options[2] APOptions,
072 ticket[3] Ticket,
073 authenticator[4] EncryptedData
074 }
075 */
076 private DERSequence encodeReplySequence( ApplicationRequest message )
077 {
078 DERSequence sequence = new DERSequence();
079
080 sequence.add( new DERTaggedObject( 0, DERInteger.valueOf( message.getProtocolVersionNumber() ) ) );
081 sequence.add( new DERTaggedObject( 1, DERInteger.valueOf( message.getMessageType().getOrdinal() ) ) );
082 sequence.add( new DERTaggedObject( 2, new DERBitString( message.getApOptions().getBytes() ) ) );
083 sequence.add( new DERTaggedObject( 3, TicketEncoder.encode( message.getTicket() ) ) );
084 sequence.add( new DERTaggedObject( 4, EncryptedDataEncoder.encodeSequence( message.getEncPart() ) ) );
085
086 return sequence;
087 }
088 }