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
021package org.apache.directory.shared.kerberos.codec.checksum.actions;
022
023
024import org.apache.directory.api.asn1.DecoderException;
025import org.apache.directory.api.asn1.ber.grammar.GrammarAction;
026import org.apache.directory.api.asn1.ber.tlv.BerValue;
027import org.apache.directory.api.asn1.ber.tlv.IntegerDecoder;
028import org.apache.directory.api.asn1.ber.tlv.IntegerDecoderException;
029import org.apache.directory.api.asn1.ber.tlv.TLV;
030import org.apache.directory.api.i18n.I18n;
031import org.apache.directory.api.util.Strings;
032import org.apache.directory.shared.kerberos.codec.checksum.ChecksumContainer;
033import org.apache.directory.shared.kerberos.components.Checksum;
034import org.apache.directory.shared.kerberos.crypto.checksum.ChecksumType;
035import org.slf4j.Logger;
036import org.slf4j.LoggerFactory;
037
038
039/**
040 * Sets the Checksum's type.
041 *
042 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
043 */
044public class StoreCksumType extends GrammarAction<ChecksumContainer>
045{
046    /** The logger */
047    private static final Logger LOG = LoggerFactory.getLogger( StoreCksumType.class );
048
049    /** Speedup for logs */
050    private static final boolean IS_DEBUG = LOG.isDebugEnabled();
051
052
053    /**
054     * Creates a new instance of ChecksumReadType.
055     */
056    public StoreCksumType()
057    {
058        super( "Checksum cksumtype" );
059    }
060
061
062    /**
063     * {@inheritDoc}
064     */
065    public void action( ChecksumContainer checksumContainer ) throws DecoderException
066    {
067        TLV tlv = checksumContainer.getCurrentTLV();
068
069        // The Length should not be null
070        if ( tlv.getLength() == 0 )
071        {
072            LOG.error( I18n.err( I18n.ERR_01308_ZERO_LENGTH_TLV ) );
073
074            // This will generate a PROTOCOL_ERROR
075            throw new DecoderException( I18n.err( I18n.ERR_01309_EMPTY_TLV ) );
076        }
077
078        Checksum checksum = checksumContainer.getChecksum();
079        // The Checksum's type is an integer
080        BerValue value = tlv.getValue();
081
082        try
083        {
084            int cksumType = IntegerDecoder.parse( value );
085
086            checksum.setChecksumType( ChecksumType.getTypeByValue( cksumType ) );
087
088            if ( IS_DEBUG )
089            {
090                LOG.debug( "cksumType : {}", cksumType );
091            }
092        }
093        catch ( IntegerDecoderException ide )
094        {
095            LOG.error( I18n.err( I18n.ERR_01310_INTEGER_DECODING_ERROR, Strings.dumpBytes( value.getData() ) ) );
096
097            // This will generate a PROTOCOL_ERROR
098            throw new DecoderException( ide.getMessage() );
099        }
100
101    }
102
103}