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    }