/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
package org.apache.directory.server.kerberos.shared.io.decoder;
import java.io.IOException;
import java.util.Enumeration;
import org.apache.directory.server.kerberos.shared.messages.Encodable;
import org.apache.directory.server.kerberos.shared.messages.components.EncApRepPart;
import org.apache.directory.server.kerberos.shared.messages.components.EncApRepPartModifier;
import org.apache.directory.shared.asn1.der.ASN1InputStream;
import org.apache.directory.shared.asn1.der.DERApplicationSpecific;
import org.apache.directory.shared.asn1.der.DEREncodable;
import org.apache.directory.shared.asn1.der.DERGeneralizedTime;
import org.apache.directory.shared.asn1.der.DERInteger;
import org.apache.directory.shared.asn1.der.DERSequence;
import org.apache.directory.shared.asn1.der.DERTaggedObject;
/**
* @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
* @version $Rev: 502338 $, $Date: 2007-02-01 11:59:43 -0800 (Thu, 01 Feb 2007) $
*/
public class EncApRepPartDecoder implements Decoder, DecoderFactory
{
public Decoder getDecoder()
{
return new EncApRepPartDecoder();
}
public Encodable decode( byte[] encodedEncApRepPart ) throws IOException
{
ASN1InputStream ais = new ASN1InputStream( encodedEncApRepPart );
DERApplicationSpecific app = ( DERApplicationSpecific ) ais.readObject();
DERSequence apRepPart = ( DERSequence ) app.getObject();
return decodeEncApRepPartSequence( apRepPart );
}
/**
* Decodes a {@link DERSequence} into a {@link EncApRepPart}.
*
* EncAPRepPart ::= [APPLICATION 27] SEQUENCE {
* ctime [0] KerberosTime,
* cusec [1] Microseconds,
* subkey [2] EncryptionKey OPTIONAL,
* seq-number [3] UInt32 OPTIONAL
* }
*
* @param sequence
* @return The {@link EncApRepPart}.
*/
private EncApRepPart decodeEncApRepPartSequence( DERSequence sequence )
{
EncApRepPartModifier modifier = new EncApRepPartModifier();
for ( Enumeration e = sequence.getObjects(); e.hasMoreElements(); )
{
DERTaggedObject object = ( DERTaggedObject ) e.nextElement();
int tag = object.getTagNo();
DEREncodable derObject = object.getObject();
switch ( tag )
{
case 0:
DERGeneralizedTime tag0 = ( DERGeneralizedTime ) derObject;
modifier.setClientTime( KerberosTimeDecoder.decode( tag0 ) );
break;
case 1:
DERInteger tag1 = ( DERInteger ) derObject;
modifier.setClientMicroSecond( new Integer( tag1.intValue() ) );
break;
case 2:
DERSequence tag2 = ( DERSequence ) derObject;
modifier.setSubSessionKey( EncryptionKeyDecoder.decode( tag2 ) );
break;
case 3:
DERInteger tag3 = ( DERInteger ) derObject;
modifier.setSequenceNumber( new Integer( tag3.intValue() ) );
break;
}
}
return modifier.getEncApRepPart();
}
}