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.Encodable;
027 import org.apache.directory.server.kerberos.shared.messages.components.EncKrbPrivPart;
028 import org.apache.directory.server.kerberos.shared.messages.components.EncKrbPrivPartModifier;
029 import org.apache.directory.shared.asn1.der.ASN1InputStream;
030 import org.apache.directory.shared.asn1.der.DERApplicationSpecific;
031 import org.apache.directory.shared.asn1.der.DEREncodable;
032 import org.apache.directory.shared.asn1.der.DERGeneralizedTime;
033 import org.apache.directory.shared.asn1.der.DERInteger;
034 import org.apache.directory.shared.asn1.der.DEROctetString;
035 import org.apache.directory.shared.asn1.der.DERSequence;
036 import org.apache.directory.shared.asn1.der.DERTaggedObject;
037
038
039 /**
040 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
041 * @version $Rev: 502338 $, $Date: 2007-02-01 21:59:43 +0200 (Thu, 01 Feb 2007) $
042 */
043 public class EncKrbPrivPartDecoder implements Decoder, DecoderFactory
044 {
045 public Decoder getDecoder()
046 {
047 return new EncKrbPrivPartDecoder();
048 }
049
050
051 public Encodable decode( byte[] encodedPrivatePart ) throws IOException
052 {
053 ASN1InputStream ais = new ASN1InputStream( encodedPrivatePart );
054
055 DERApplicationSpecific app = ( DERApplicationSpecific ) ais.readObject();
056
057 DERSequence privatePart = ( DERSequence ) app.getObject();
058
059 return decodePrivatePartSequence( privatePart );
060 }
061
062
063 private EncKrbPrivPart decodePrivatePartSequence( DERSequence sequence )
064 {
065 EncKrbPrivPartModifier modifier = new EncKrbPrivPartModifier();
066
067 for ( Enumeration e = sequence.getObjects(); e.hasMoreElements(); )
068 {
069 DERTaggedObject object = ( DERTaggedObject ) e.nextElement();
070 int tag = object.getTagNo();
071 DEREncodable derObject = object.getObject();
072
073 switch ( tag )
074 {
075 case 0:
076 DEROctetString tag0 = ( DEROctetString ) derObject;
077 modifier.setUserData( tag0.getOctets() );
078 break;
079 case 1:
080 DERGeneralizedTime tag1 = ( DERGeneralizedTime ) derObject;
081 modifier.setTimestamp( KerberosTimeDecoder.decode( tag1 ) );
082 break;
083 case 2:
084 DERInteger tag2 = ( DERInteger ) derObject;
085 modifier.setMicroSecond( new Integer( tag2.intValue() ) );
086 break;
087 case 3:
088 DERInteger tag3 = ( DERInteger ) derObject;
089 modifier.setSequenceNumber( new Integer( tag3.intValue() ) );
090 break;
091 case 4:
092 DERSequence tag4 = ( DERSequence ) derObject;
093 modifier.setSenderAddress( HostAddressDecoder.decode( tag4 ) );
094 break;
095 case 5:
096 DERSequence tag5 = ( DERSequence ) derObject;
097 modifier.setRecipientAddress( HostAddressDecoder.decode( tag5 ) );
098 break;
099 }
100 }
101 return modifier.getEncKrbPrivPart();
102 }
103 }