/*
* 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.encoder;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import org.apache.directory.server.kerberos.shared.messages.value.PaData;
import org.apache.directory.shared.asn1.der.ASN1OutputStream;
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 PreAuthenticationDataEncoder
{
/**
* Encodes an array of {@link PaData}s into a byte array.
*
* @param preAuth
* @return The byte array.
* @throws IOException
*/
public static byte[] encode( PaData[] preAuth ) throws IOException
{
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ASN1OutputStream aos = new ASN1OutputStream( baos );
aos.writeObject( encodeSequence( preAuth ) );
aos.close();
return baos.toByteArray();
}
/**
* METHOD-DATA ::= SEQUENCE OF PA-DATA
*/
protected static DERSequence encodeSequence( PaData[] preAuth )
{
DERSequence sequence = new DERSequence();
for ( int ii = 0; ii < preAuth.length; ii++ )
{
sequence.add( encode( preAuth[ii] ) );
}
return sequence;
}
/**
* PA-DATA ::= SEQUENCE {
* padata-type[1] INTEGER,
* padata-value[2] OCTET STRING
* }
*/
protected static DERSequence encode( PaData preAuth )
{
DERSequence sequence = new DERSequence();
sequence.add( new DERTaggedObject( 1, DERInteger.valueOf( preAuth.getPaDataType().getOrdinal() ) ) );
if ( preAuth.getPaDataValue() != null )
{
sequence.add( new DERTaggedObject( 2, new DEROctetString( preAuth.getPaDataValue() ) ) );
}
return sequence;
}
}