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 org.apache.directory.server.kerberos.shared.messages.value.Checksum;
024    import org.apache.directory.shared.asn1.der.DERInteger;
025    import org.apache.directory.shared.asn1.der.DEROctetString;
026    import org.apache.directory.shared.asn1.der.DERSequence;
027    import org.apache.directory.shared.asn1.der.DERTaggedObject;
028    
029    
030    /**
031     * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
032     * @version $Rev: 540371 $, $Date: 2007-05-22 02:00:43 +0200 (Tue, 22 May 2007) $
033     */
034    public class ChecksumEncoder
035    {
036        /**
037         * Encodes a {@link Checksum} into a {@link DERSequence}.
038         * 
039         * Checksum ::=   SEQUENCE {
040         *          cksumtype[0]   INTEGER,
041         *          checksum[1]    OCTET STRING
042         * }
043         * 
044         * @param checksum 
045         * @return The {@link DERSequence}.
046         */
047        public static DERSequence encode( Checksum checksum )
048        {
049            DERSequence vector = new DERSequence();
050    
051            vector.add( new DERTaggedObject( 0, DERInteger.valueOf( checksum.getChecksumType().getOrdinal() ) ) );
052            vector.add( new DERTaggedObject( 1, new DEROctetString( checksum.getChecksumValue() ) ) );
053    
054            return vector;
055        }
056    }