/*
* 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.value.PaData;
import org.apache.directory.server.kerberos.shared.messages.value.types.PaDataType;
import org.apache.directory.shared.asn1.der.ASN1InputStream;
import org.apache.directory.shared.asn1.der.DEREncodable;
import org.apache.directory.shared.asn1.der.DERInteger;
import org.apache.directory.shared.asn1.der.DEROctetString;
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: 587624 $, $Date: 2007-10-23 21:22:08 +0200 (Mar, 23 oct 2007) $
*/
public class PreAuthenticationDataDecoder
{
/**
* Decodes a byte array into {@link PaData}.
*
* @param encodedPreAuthData
* @return The {@link PaData}.
* @throws IOException
*/
public PaData decode( byte[] encodedPreAuthData ) throws IOException
{
ASN1InputStream ais = new ASN1InputStream( encodedPreAuthData );
DERSequence sequence = ( DERSequence ) ais.readObject();
return decode( sequence );
}
/**
* KDC-REQ ::= SEQUENCE {
* pvno[1] INTEGER,
* msg-type[2] INTEGER,
* padata[3] SEQUENCE OF PA-DATA OPTIONAL,
* req-body[4] KDC-REQ-BODY
* }
*/
protected static PaData[] decodeSequence( DERSequence sequence )
{
PaData[] paDataSequence = new PaData[sequence.size()];
int ii = 0;
for ( Enumeration<DEREncodable> e = sequence.getObjects(); e.hasMoreElements(); )
{
DERSequence object = ( DERSequence ) e.nextElement();
PaData paData = PreAuthenticationDataDecoder.decode( object );
paDataSequence[ii] = paData;
ii++;
}
return paDataSequence;
}
/**
* PA-DATA ::= SEQUENCE {
* padata-type[1] INTEGER,
* padata-value[2] OCTET STRING,
* -- might be encoded AP-REQ
* }
*/
protected static PaData decode( DERSequence sequence )
{
PaData paData = new PaData();
for ( Enumeration<DEREncodable> e = sequence.getObjects(); e.hasMoreElements(); )
{
DERTaggedObject object = ( DERTaggedObject ) e.nextElement();
int tag = object.getTagNo();
DEREncodable derObject = object.getObject();
switch ( tag )
{
case 1:
DERInteger padataType = ( DERInteger ) derObject;
PaDataType type = PaDataType.getTypeByOrdinal( padataType.intValue() );
paData.setPaDataType( type );
break;
case 2:
DEROctetString padataValue = ( DEROctetString ) derObject;
paData.setPaDataValue( padataValue.getOctets() );
break;
}
}
return paData;
}
}