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.EncryptionTypeInfoEntry;
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: 540371 $, $Date: 2007-05-22 03:00:43 +0300 (Tue, 22 May 2007) $
037 */
038 public class EncryptionTypeInfoEncoder
039 {
040 /**
041 * Encodes an array of {@link EncryptionTypeInfoEntry}s into a byte array.
042 *
043 * @param entries
044 * @return The byte array.
045 * @throws IOException
046 */
047 public static byte[] encode( EncryptionTypeInfoEntry[] entries ) throws IOException
048 {
049 ByteArrayOutputStream baos = new ByteArrayOutputStream();
050 ASN1OutputStream aos = new ASN1OutputStream( baos );
051 aos.writeObject( encodeSequence( entries ) );
052 aos.close();
053
054 return baos.toByteArray();
055 }
056
057
058 /**
059 * ETYPE-INFO ::= SEQUENCE OF ETYPE-INFO-ENTRY
060 */
061 protected static DERSequence encodeSequence( EncryptionTypeInfoEntry[] entries )
062 {
063 DERSequence sequence = new DERSequence();
064
065 for ( int ii = 0; ii < entries.length; ii++ )
066 {
067 sequence.add( encode( entries[ii] ) );
068 }
069
070 return sequence;
071 }
072
073
074 /**
075 * ETYPE-INFO-ENTRY ::= SEQUENCE {
076 * etype [0] Int32,
077 * salt [1] OCTET STRING OPTIONAL
078 * }
079 */
080 protected static DERSequence encode( EncryptionTypeInfoEntry entry )
081 {
082 DERSequence sequence = new DERSequence();
083
084 sequence.add( new DERTaggedObject( 0, DERInteger.valueOf( entry.getEncryptionType().getOrdinal() ) ) );
085
086 if ( entry.getSalt() != null )
087 {
088 sequence.add( new DERTaggedObject( 1, new DEROctetString( entry.getSalt() ) ) );
089 }
090
091 return sequence;
092 }
093 }