/*
* 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.KerberosMessageType;
import org.apache.directory.server.kerberos.shared.messages.application.PrivateMessage;
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.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: 589780 $, $Date: 2007-10-29 19:14:59 +0100 (Lun, 29 oct 2007) $
*/
public class PrivateMessageDecoder
{
/**
* Decodes a byte array into a {@link PrivateMessage}.
*
* @param encodedPrivateMessage
* @return The {@link PrivateMessage}.
* @throws IOException
*/
public PrivateMessage decode( byte[] encodedPrivateMessage ) throws IOException
{
ASN1InputStream ais = new ASN1InputStream( encodedPrivateMessage );
DERApplicationSpecific app = ( DERApplicationSpecific ) ais.readObject();
DERSequence privateMessage = ( DERSequence ) app.getObject();
return decodePrivateMessageSequence( privateMessage );
}
private PrivateMessage decodePrivateMessageSequence( DERSequence sequence )
{
PrivateMessage message = new PrivateMessage();
for ( Enumeration<DEREncodable> 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;
message.setProtocolVersionNumber( tag0.intValue() );
break;
case 1:
DERInteger tag1 = ( DERInteger ) derObject;
message.setMessageType( KerberosMessageType.getTypeByOrdinal( tag1.intValue() ) );
break;
case 3:
DERSequence tag3 = ( DERSequence ) derObject;
message.setEncryptedPart( EncryptedDataDecoder.decode( tag3 ) );
break;
}
}
return message;
}
}