/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
package org.apache.directory.server.kerberos.shared.io.decoder;
import java.io.IOException;
import java.util.Enumeration;
import org.apache.directory.server.kerberos.shared.messages.Encodable;
import org.apache.directory.server.kerberos.shared.messages.value.EncryptedTimeStamp;
import org.apache.directory.server.kerberos.shared.messages.value.EncryptedTimeStampModifier;
import org.apache.directory.shared.asn1.der.ASN1InputStream;
import org.apache.directory.shared.asn1.der.DEREncodable;
import org.apache.directory.shared.asn1.der.DERGeneralizedTime;
import org.apache.directory.shared.asn1.der.DERInteger;
import org.apache.directory.shared.asn1.der.DERSequence;
import org.apache.directory.shared.asn1.der.DERTaggedObject;
/**
* padata-type ::= PA-ENC-TIMESTAMP
* padata-value ::= EncryptedData -- PA-ENC-TS-ENC
*
* PA-ENC-TS-ENC ::= SEQUENCE {
* patimestamp[0] KerberosTime, -- client's time
* pausec[1] INTEGER OPTIONAL
* }
*
* @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
* @version $Rev: 502338 $, $Date: 2007-02-01 20:59:43 +0100 (Jeu, 01 fév 2007) $
*/
public class EncryptedTimestampDecoder implements Decoder, DecoderFactory
{
public Decoder getDecoder()
{
return new EncryptedTimestampDecoder();
}
public Encodable decode( byte[] encodedEncryptedTimestamp ) throws IOException
{
ASN1InputStream ais = new ASN1InputStream( encodedEncryptedTimestamp );
DERSequence sequence = ( DERSequence ) ais.readObject();
return decodeEncryptedTimestamp( sequence );
}
protected EncryptedTimeStamp decodeEncryptedTimestamp( DERSequence sequence )
{
EncryptedTimeStampModifier modifier = new EncryptedTimeStampModifier();
for ( Enumeration e = sequence.getObjects(); e.hasMoreElements(); )
{
DERTaggedObject object = ( DERTaggedObject ) e.nextElement();
int tag = object.getTagNo();
DEREncodable derObject = object.getObject();
switch ( tag )
{
case 0:
DERGeneralizedTime tag0 = ( DERGeneralizedTime ) derObject;
modifier.setKerberosTime( KerberosTimeDecoder.decode( tag0 ) );
break;
case 1:
DERInteger tag1 = ( DERInteger ) derObject;
modifier.setMicroSecond( tag1.intValue() );
break;
}
}
return modifier.getEncryptedTimestamp();
}
}