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 20:59:43 +0100 (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 }