/*
* 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.application.ApplicationReply;
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.DERSequence;
import org.apache.directory.shared.asn1.der.DERTaggedObject;
/**
* @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
* @version $Rev: 540371 $, $Date: 2007-05-21 17:00:43 -0700 (Mon, 21 May 2007) $
*/
public class ApplicationReplyDecoder
{
/**
* Decodes a byte array into an {@link ApplicationReply}.
*
* @param encodedAuthHeader
* @return The {@link ApplicationReply}.
* @throws IOException
*/
public ApplicationReply decode( byte[] encodedAuthHeader ) throws IOException
{
ASN1InputStream ais = new ASN1InputStream( encodedAuthHeader );
DERApplicationSpecific app = ( DERApplicationSpecific ) ais.readObject();
DERSequence apreq = ( DERSequence ) app.getObject();
return decodeApplicationRequestSequence( apreq );
}
/*
AP-REP ::= [APPLICATION 15] SEQUENCE {
pvno[0] INTEGER,
msg-type[1] INTEGER,
enc-part[2] EncryptedData
}
*/
private ApplicationReply decodeApplicationRequestSequence( DERSequence sequence )
{
ApplicationReply authHeader = null;
for ( Enumeration e = sequence.getObjects(); e.hasMoreElements(); )
{
DERTaggedObject object = ( ( DERTaggedObject ) e.nextElement() );
int tag = object.getTagNo();
DEREncodable derObject = object.getObject();
switch ( tag )
{
case 0:
//DERInteger tag0 = ( DERInteger ) derObject;
//authHeader.setProtocolVersionNumber( tag0.intValue() );
break;
case 1:
//DERInteger tag1 = ( DERInteger ) derObject;
//authHeader.setMessageType( MessageType.getTypeByOrdinal( tag1.intValue() ) );
break;
case 2:
DERSequence tag2 = ( DERSequence ) derObject;
authHeader = new ApplicationReply( EncryptedDataDecoder.decode( tag2 ) );
break;
}
}
return authHeader;
}
}