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.KerberosMessageType; 027 import org.apache.directory.server.kerberos.shared.messages.application.PrivateMessage; 028 import org.apache.directory.shared.asn1.der.ASN1InputStream; 029 import org.apache.directory.shared.asn1.der.DERApplicationSpecific; 030 import org.apache.directory.shared.asn1.der.DEREncodable; 031 import org.apache.directory.shared.asn1.der.DERInteger; 032 import org.apache.directory.shared.asn1.der.DERSequence; 033 import org.apache.directory.shared.asn1.der.DERTaggedObject; 034 035 036 /** 037 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 038 * @version $Rev: 589780 $, $Date: 2007-10-29 19:14:59 +0100 (Mon, 29 Oct 2007) $ 039 */ 040 public class PrivateMessageDecoder 041 { 042 /** 043 * Decodes a byte array into a {@link PrivateMessage}. 044 * 045 * @param encodedPrivateMessage 046 * @return The {@link PrivateMessage}. 047 * @throws IOException 048 */ 049 public PrivateMessage decode( byte[] encodedPrivateMessage ) throws IOException 050 { 051 ASN1InputStream ais = new ASN1InputStream( encodedPrivateMessage ); 052 053 DERApplicationSpecific app = ( DERApplicationSpecific ) ais.readObject(); 054 055 DERSequence privateMessage = ( DERSequence ) app.getObject(); 056 057 return decodePrivateMessageSequence( privateMessage ); 058 } 059 060 061 private PrivateMessage decodePrivateMessageSequence( DERSequence sequence ) 062 { 063 PrivateMessage message = new PrivateMessage(); 064 065 for ( Enumeration<DEREncodable> e = sequence.getObjects(); e.hasMoreElements(); ) 066 { 067 DERTaggedObject object = ( DERTaggedObject ) e.nextElement(); 068 int tag = object.getTagNo(); 069 DEREncodable derObject = object.getObject(); 070 071 switch ( tag ) 072 { 073 case 0: 074 DERInteger tag0 = ( DERInteger ) derObject; 075 message.setProtocolVersionNumber( tag0.intValue() ); 076 break; 077 078 case 1: 079 DERInteger tag1 = ( DERInteger ) derObject; 080 message.setMessageType( KerberosMessageType.getTypeByOrdinal( tag1.intValue() ) ); 081 break; 082 083 case 3: 084 DERSequence tag3 = ( DERSequence ) derObject; 085 message.setEncryptedPart( EncryptedDataDecoder.decode( tag3 ) ); 086 break; 087 } 088 } 089 090 return message; 091 } 092 }