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.PaData;
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: 587624 $, $Date: 2007-10-23 22:22:08 +0300 (Tue, 23 Oct 2007) $
037 */
038 public class PreAuthenticationDataEncoder
039 {
040 /**
041 * Encodes an array of {@link PaData}s into a byte array.
042 *
043 * @param preAuth
044 * @return The byte array.
045 * @throws IOException
046 */
047 public static byte[] encode( PaData[] preAuth ) throws IOException
048 {
049 ByteArrayOutputStream baos = new ByteArrayOutputStream();
050 ASN1OutputStream aos = new ASN1OutputStream( baos );
051
052 aos.writeObject( encodeSequence( preAuth ) );
053 aos.close();
054
055 return baos.toByteArray();
056 }
057
058
059 /**
060 * METHOD-DATA ::= SEQUENCE OF PA-DATA
061 */
062 protected static DERSequence encodeSequence( PaData[] preAuth )
063 {
064 DERSequence sequence = new DERSequence();
065
066 for ( int ii = 0; ii < preAuth.length; ii++ )
067 {
068 sequence.add( encode( preAuth[ii] ) );
069 }
070
071 return sequence;
072 }
073
074
075 /**
076 * PA-DATA ::= SEQUENCE {
077 * padata-type[1] INTEGER,
078 * padata-value[2] OCTET STRING
079 * }
080 */
081 protected static DERSequence encode( PaData preAuth )
082 {
083 DERSequence sequence = new DERSequence();
084
085 sequence.add( new DERTaggedObject( 1, DERInteger.valueOf( preAuth.getPaDataType().getOrdinal() ) ) );
086
087 if ( preAuth.getPaDataValue() != null )
088 {
089 sequence.add( new DERTaggedObject( 2, new DEROctetString( preAuth.getPaDataValue() ) ) );
090 }
091
092 return sequence;
093 }
094 }