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.EncryptionTypeInfo2Entry;
027 import org.apache.directory.shared.asn1.der.ASN1OutputStream;
028 import org.apache.directory.shared.asn1.der.DERGeneralString;
029 import org.apache.directory.shared.asn1.der.DERInteger;
030 import org.apache.directory.shared.asn1.der.DEROctetString;
031 import org.apache.directory.shared.asn1.der.DERSequence;
032 import org.apache.directory.shared.asn1.der.DERTaggedObject;
033
034
035 /**
036 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
037 * @version $Rev: 540371 $, $Date: 2007-05-21 17:00:43 -0700 (Mon, 21 May 2007) $
038 */
039 public class EncryptionTypeInfo2Encoder
040 {
041 /**
042 * Encodes an array of {@link EncryptionTypeInfo2Entry}s into a byte array.
043 *
044 * @param entries
045 * @return The byte array.
046 * @throws IOException
047 */
048 public static byte[] encode( EncryptionTypeInfo2Entry[] entries ) throws IOException
049 {
050 ByteArrayOutputStream baos = new ByteArrayOutputStream();
051 ASN1OutputStream aos = new ASN1OutputStream( baos );
052 aos.writeObject( encodeSequence( entries ) );
053 aos.close();
054
055 return baos.toByteArray();
056 }
057
058
059 /**
060 * ETYPE-INFO2 ::= SEQUENCE SIZE (1..MAX) OF ETYPE-INFO2-ENTRY
061 */
062 protected static DERSequence encodeSequence( EncryptionTypeInfo2Entry[] entries )
063 {
064 DERSequence sequence = new DERSequence();
065
066 for ( int ii = 0; ii < entries.length; ii++ )
067 {
068 sequence.add( encode( entries[ii] ) );
069 }
070
071 return sequence;
072 }
073
074
075 /**
076 * ETYPE-INFO2-ENTRY ::= SEQUENCE {
077 * etype [0] Int32,
078 * salt [1] KerberosString OPTIONAL,
079 * s2kparams [2] OCTET STRING OPTIONAL
080 * }
081 */
082 protected static DERSequence encode( EncryptionTypeInfo2Entry entry )
083 {
084 DERSequence sequence = new DERSequence();
085
086 sequence.add( new DERTaggedObject( 0, DERInteger.valueOf( entry.getEncryptionType().getOrdinal() ) ) );
087
088 if ( entry.getSalt() != null )
089 {
090 sequence.add( new DERTaggedObject( 1, DERGeneralString.valueOf( entry.getSalt() ) ) );
091 }
092
093 if ( entry.getS2kParams() != null )
094 {
095 sequence.add( new DERTaggedObject( 2, new DEROctetString( entry.getS2kParams() ) ) );
096 }
097
098 return sequence;
099 }
100 }