/*
* 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.EncryptedData;
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: 587682 $, $Date: 2007-10-24 00:47:43 +0200 (Mer, 24 oct 2007) $
*/
public class EncryptedDataEncoder
{
/**
* Encodes an {@link EncryptedData} into a byte array.
*
* @param encryptedData
* @return The byte array.
* @throws IOException
*/
public static byte[] encode( EncryptedData encryptedData ) throws IOException
{
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ASN1OutputStream aos = new ASN1OutputStream( baos );
aos.writeObject( encodeSequence( encryptedData ) );
aos.close();
return baos.toByteArray();
}
/**
* Encodes an {@link EncryptedData} into a {@link DERSequence}.
*
* EncryptedData ::= SEQUENCE {
* etype[0] INTEGER, -- EncryptionEngine
* kvno[1] INTEGER OPTIONAL,
* cipher[2] OCTET STRING -- ciphertext
* }
*
* @param encryptedData
* @return The {@link DERSequence}.
*/
public static DERSequence encodeSequence( EncryptedData encryptedData )
{
DERSequence sequence = new DERSequence();
sequence.add( new DERTaggedObject( 0, DERInteger.valueOf( encryptedData.getEType().getOrdinal() ) ) );
if ( encryptedData.hasKvno() )
{
sequence.add( new DERTaggedObject( 1, DERInteger.valueOf( encryptedData.getKvno() ) ) );
}
sequence.add( new DERTaggedObject( 2, new DEROctetString( encryptedData.getCipher() ) ) );
return sequence;
}
}