001 /*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements. See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership. The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License. You may obtain a copy of the License at
009 *
010 * http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied. See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 *
019 */
020 package org.apache.directory.server.kerberos.shared.io.encoder;
021
022
023 import java.io.ByteArrayOutputStream;
024 import java.io.IOException;
025
026 import org.apache.directory.server.kerberos.shared.messages.value.EncryptedData;
027 import org.apache.directory.shared.asn1.der.ASN1OutputStream;
028 import org.apache.directory.shared.asn1.der.DERInteger;
029 import org.apache.directory.shared.asn1.der.DEROctetString;
030 import org.apache.directory.shared.asn1.der.DERSequence;
031 import org.apache.directory.shared.asn1.der.DERTaggedObject;
032
033
034 /**
035 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
036 * @version $Rev: 587682 $, $Date: 2007-10-24 01:47:43 +0300 (Wed, 24 Oct 2007) $
037 */
038 public class EncryptedDataEncoder
039 {
040 /**
041 * Encodes an {@link EncryptedData} into a byte array.
042 *
043 * @param encryptedData
044 * @return The byte array.
045 * @throws IOException
046 */
047 public static byte[] encode( EncryptedData encryptedData ) throws IOException
048 {
049 ByteArrayOutputStream baos = new ByteArrayOutputStream();
050 ASN1OutputStream aos = new ASN1OutputStream( baos );
051
052 aos.writeObject( encodeSequence( encryptedData ) );
053 aos.close();
054
055 return baos.toByteArray();
056 }
057
058
059 /**
060 * Encodes an {@link EncryptedData} into a {@link DERSequence}.
061 *
062 * EncryptedData ::= SEQUENCE {
063 * etype[0] INTEGER, -- EncryptionEngine
064 * kvno[1] INTEGER OPTIONAL,
065 * cipher[2] OCTET STRING -- ciphertext
066 * }
067 *
068 * @param encryptedData
069 * @return The {@link DERSequence}.
070 */
071 public static DERSequence encodeSequence( EncryptedData encryptedData )
072 {
073 DERSequence sequence = new DERSequence();
074
075 sequence.add( new DERTaggedObject( 0, DERInteger.valueOf( encryptedData.getEType().getOrdinal() ) ) );
076
077 if ( encryptedData.hasKvno() )
078 {
079 sequence.add( new DERTaggedObject( 1, DERInteger.valueOf( encryptedData.getKvno() ) ) );
080 }
081
082 sequence.add( new DERTaggedObject( 2, new DEROctetString( encryptedData.getCipher() ) ) );
083
084 return sequence;
085 }
086 }