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.sam;
021    
022    
023    import javax.security.auth.kerberos.KerberosKey;
024    
025    
026    /**
027     * Checks the integrity of a kerberos key to decode-decrypt an encrypted
028     * generalized timestamp representing the pre-auth data.
029     *
030     * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
031     * @version $Rev: 437036 $
032     */
033    public interface KeyIntegrityChecker
034    {
035        /**
036         * Checks the integrity of a KerberosKey to decrypt-decode and compare an
037         * encrypted encoded generalized timestamp representing the preauth data.
038         *
039         * @param preauthData the generalized timestamp encrypted with client hotp
040         * generated KerberosKey
041         * @param key the KerberosKey generated from server side hotp value
042         * @return true if the key can decrypt-decode and make sense out of the
043         * timestamp verifying that it is in skew, false otherwise
044         */
045        boolean checkKeyIntegrity( byte[] preauthData, KerberosKey key );
046    }