1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, 13 * software distributed under the License is distributed on an 14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 15 * KIND, either express or implied. See the License for the 16 * specific language governing permissions and limitations 17 * under the License. 18 * 19 */ 20 package org.apache.directory.server.kerberos.shared.crypto.checksum; 21 22 23 import java.security.GeneralSecurityException; 24 25 import javax.crypto.Mac; 26 import javax.crypto.SecretKey; 27 import javax.crypto.spec.SecretKeySpec; 28 29 import org.apache.directory.server.kerberos.shared.crypto.encryption.KeyUsage; 30 31 32 /** 33 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 34 * @version $Rev$, $Date$ 35 */ 36 class HmacMd5Checksum implements ChecksumEngine 37 { 38 public ChecksumType checksumType() 39 { 40 return ChecksumType.HMAC_MD5; 41 } 42 43 44 public byte[] calculateChecksum( byte[] data, byte[] key, KeyUsage usage ) 45 { 46 try 47 { 48 SecretKey sk = new SecretKeySpec( key, "ARCFOUR" ); 49 50 Mac mac = Mac.getInstance( "HmacMD5" ); 51 mac.init( sk ); 52 53 return mac.doFinal( data ); 54 } 55 catch ( GeneralSecurityException nsae ) 56 { 57 nsae.printStackTrace(); 58 return null; 59 } 60 } 61 }