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 17:23:32 +0200 (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 }