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.decoder; 021 022 023 import java.io.IOException; 024 import java.util.Enumeration; 025 026 import org.apache.directory.server.kerberos.shared.messages.application.ApplicationReply; 027 import org.apache.directory.shared.asn1.der.ASN1InputStream; 028 import org.apache.directory.shared.asn1.der.DERApplicationSpecific; 029 import org.apache.directory.shared.asn1.der.DEREncodable; 030 import org.apache.directory.shared.asn1.der.DERSequence; 031 import org.apache.directory.shared.asn1.der.DERTaggedObject; 032 033 034 /** 035 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 036 * @version $Rev: 540371 $, $Date: 2007-05-21 17:00:43 -0700 (Mon, 21 May 2007) $ 037 */ 038 public class ApplicationReplyDecoder 039 { 040 /** 041 * Decodes a byte array into an {@link ApplicationReply}. 042 * 043 * @param encodedAuthHeader 044 * @return The {@link ApplicationReply}. 045 * @throws IOException 046 */ 047 public ApplicationReply decode( byte[] encodedAuthHeader ) throws IOException 048 { 049 ASN1InputStream ais = new ASN1InputStream( encodedAuthHeader ); 050 051 DERApplicationSpecific app = ( DERApplicationSpecific ) ais.readObject(); 052 053 DERSequence apreq = ( DERSequence ) app.getObject(); 054 055 return decodeApplicationRequestSequence( apreq ); 056 } 057 058 059 /* 060 AP-REP ::= [APPLICATION 15] SEQUENCE { 061 pvno[0] INTEGER, 062 msg-type[1] INTEGER, 063 enc-part[2] EncryptedData 064 } 065 */ 066 private ApplicationReply decodeApplicationRequestSequence( DERSequence sequence ) 067 { 068 ApplicationReply authHeader = null; 069 070 for ( Enumeration e = sequence.getObjects(); e.hasMoreElements(); ) 071 { 072 DERTaggedObject object = ( ( DERTaggedObject ) e.nextElement() ); 073 int tag = object.getTagNo(); 074 DEREncodable derObject = object.getObject(); 075 076 switch ( tag ) 077 { 078 case 0: 079 //DERInteger tag0 = ( DERInteger ) derObject; 080 //authHeader.setProtocolVersionNumber( tag0.intValue() ); 081 break; 082 case 1: 083 //DERInteger tag1 = ( DERInteger ) derObject; 084 //authHeader.setMessageType( MessageType.getTypeByOrdinal( tag1.intValue() ) ); 085 break; 086 case 2: 087 DERSequence tag2 = ( DERSequence ) derObject; 088 authHeader = new ApplicationReply( EncryptedDataDecoder.decode( tag2 ) ); 089 break; 090 } 091 } 092 093 return authHeader; 094 } 095 }