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.decoder;
021    
022    
023    import java.util.Enumeration;
024    import java.util.HashSet;
025    import java.util.Set;
026    
027    import org.apache.directory.server.kerberos.shared.crypto.encryption.EncryptionType;
028    import org.apache.directory.shared.asn1.der.DEREncodable;
029    import org.apache.directory.shared.asn1.der.DERInteger;
030    import org.apache.directory.shared.asn1.der.DERSequence;
031    
032    
033    /**
034     * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
035     * @version $Rev: 590715 $, $Date: 2007-10-31 16:23:32 +0100 (Wed, 31 Oct 2007) $
036     */
037    public class EncryptionTypeDecoder
038    {
039        /**
040         * etype[8]             SEQUENCE OF INTEGER, -- EncryptionType,
041         *             -- in preference order
042         */
043        protected static Set<EncryptionType> decode( DERSequence sequence )
044        {
045            Set<EncryptionType> eTypes = new HashSet<EncryptionType>( sequence.size() );
046    
047            int ii = 0;
048            
049            for ( Enumeration<DEREncodable> e = sequence.getObjects(); e.hasMoreElements(); )
050            {
051                DERInteger object = ( DERInteger ) e.nextElement();
052                eTypes.add( EncryptionType.getTypeByOrdinal( object.intValue() ) );
053                ii++;
054            }
055    
056            return eTypes;
057        }
058    }