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 }