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 */
020package org.apache.directory.server.kerberos.sam;
021
022
023import 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 */
032public interface KeyIntegrityChecker
033{
034    /**
035     * Checks the integrity of a KerberosKey to decrypt-decode and compare an
036     * encrypted encoded generalized timestamp representing the preauth data.
037     *
038     * @param preauthData the generalized timestamp encrypted with client hotp
039     * generated KerberosKey
040     * @param key the KerberosKey generated from server side hotp value
041     * @return true if the key can decrypt-decode and make sense out of the
042     * timestamp verifying that it is in skew, false otherwise
043     */
044    boolean checkKeyIntegrity( byte[] preauthData, KerberosKey key );
045}