| /* |
| * 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.crypto.checksum; |
| |
| |
| import java.util.zip.CRC32; |
| |
| import org.apache.directory.server.kerberos.shared.crypto.encryption.KeyUsage; |
| import org.apache.directory.shared.kerberos.crypto.checksum.ChecksumType; |
| |
| |
| /** |
| * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> |
| */ |
| class Crc32Checksum implements ChecksumEngine |
| { |
| public ChecksumType checksumType() |
| { |
| return ChecksumType.CRC32; |
| } |
| |
| |
| public byte[] calculateChecksum( byte[] data, byte[] key, KeyUsage usage ) |
| { |
| CRC32 crc32 = new CRC32(); |
| crc32.update( data ); |
| |
| return int2octet( ( int ) crc32.getValue() ); |
| } |
| |
| |
| private byte[] int2octet( int value ) |
| { |
| byte[] bytes = new byte[4]; |
| int i, shift; |
| |
| for ( i = 0, shift = 24; i < 4; i++, shift -= 8 ) |
| { |
| bytes[i] = ( byte ) ( 0xFF & ( value >> shift ) ); |
| } |
| |
| return bytes; |
| } |
| } |