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.io.IOException;
024 import java.util.Enumeration;
025
026 import org.apache.directory.server.kerberos.shared.messages.Encodable;
027 import org.apache.directory.server.kerberos.shared.messages.value.EncryptedTimeStamp;
028 import org.apache.directory.server.kerberos.shared.messages.value.EncryptedTimeStampModifier;
029 import org.apache.directory.shared.asn1.der.ASN1InputStream;
030 import org.apache.directory.shared.asn1.der.DEREncodable;
031 import org.apache.directory.shared.asn1.der.DERGeneralizedTime;
032 import org.apache.directory.shared.asn1.der.DERInteger;
033 import org.apache.directory.shared.asn1.der.DERSequence;
034 import org.apache.directory.shared.asn1.der.DERTaggedObject;
035
036
037 /**
038 * padata-type ::= PA-ENC-TIMESTAMP
039 * padata-value ::= EncryptedData -- PA-ENC-TS-ENC
040 *
041 * PA-ENC-TS-ENC ::= SEQUENCE {
042 * patimestamp[0] KerberosTime, -- client's time
043 * pausec[1] INTEGER OPTIONAL
044 * }
045 *
046 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
047 * @version $Rev: 502338 $, $Date: 2007-02-01 21:59:43 +0200 (Thu, 01 Feb 2007) $
048 */
049 public class EncryptedTimestampDecoder implements Decoder, DecoderFactory
050 {
051 public Decoder getDecoder()
052 {
053 return new EncryptedTimestampDecoder();
054 }
055
056
057 public Encodable decode( byte[] encodedEncryptedTimestamp ) throws IOException
058 {
059 ASN1InputStream ais = new ASN1InputStream( encodedEncryptedTimestamp );
060
061 DERSequence sequence = ( DERSequence ) ais.readObject();
062
063 return decodeEncryptedTimestamp( sequence );
064 }
065
066
067 protected EncryptedTimeStamp decodeEncryptedTimestamp( DERSequence sequence )
068 {
069 EncryptedTimeStampModifier modifier = new EncryptedTimeStampModifier();
070
071 for ( Enumeration e = sequence.getObjects(); e.hasMoreElements(); )
072 {
073 DERTaggedObject object = ( DERTaggedObject ) e.nextElement();
074 int tag = object.getTagNo();
075 DEREncodable derObject = object.getObject();
076
077 switch ( tag )
078 {
079 case 0:
080 DERGeneralizedTime tag0 = ( DERGeneralizedTime ) derObject;
081 modifier.setKerberosTime( KerberosTimeDecoder.decode( tag0 ) );
082 break;
083 case 1:
084 DERInteger tag1 = ( DERInteger ) derObject;
085 modifier.setMicroSecond( tag1.intValue() );
086 break;
087 }
088 }
089
090 return modifier.getEncryptedTimestamp();
091 }
092 }