| /* |
| * ==================================================================== |
| * 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.poi.poifs.crypt.temp; |
| |
| import java.io.FileInputStream; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.security.SecureRandom; |
| |
| import javax.crypto.Cipher; |
| import javax.crypto.CipherInputStream; |
| import javax.crypto.CipherOutputStream; |
| import javax.crypto.spec.SecretKeySpec; |
| |
| import org.apache.poi.poifs.crypt.ChainingMode; |
| import org.apache.poi.poifs.crypt.CipherAlgorithm; |
| import org.apache.poi.poifs.crypt.CryptoFunctions; |
| import org.apache.poi.util.Beta; |
| import org.apache.poi.xssf.streaming.SheetDataWriter; |
| |
| @Beta |
| public class SheetDataWriterWithDecorator extends SheetDataWriter { |
| final static CipherAlgorithm cipherAlgorithm = CipherAlgorithm.aes128; |
| SecretKeySpec skeySpec; |
| byte[] ivBytes; |
| |
| public SheetDataWriterWithDecorator() throws IOException { |
| super(); |
| } |
| |
| void init() { |
| if(skeySpec == null) { |
| SecureRandom sr = new SecureRandom(); |
| ivBytes = new byte[16]; |
| byte[] keyBytes = new byte[16]; |
| sr.nextBytes(ivBytes); |
| sr.nextBytes(keyBytes); |
| skeySpec = new SecretKeySpec(keyBytes, cipherAlgorithm.jceId); |
| } |
| } |
| |
| @Override |
| protected OutputStream decorateOutputStream(FileOutputStream fos) { |
| init(); |
| Cipher ciEnc = CryptoFunctions.getCipher(skeySpec, cipherAlgorithm, ChainingMode.cbc, ivBytes, Cipher.ENCRYPT_MODE, "PKCS5Padding"); |
| return new CipherOutputStream(fos, ciEnc); |
| } |
| |
| @Override |
| protected InputStream decorateInputStream(FileInputStream fis) { |
| Cipher ciDec = CryptoFunctions.getCipher(skeySpec, cipherAlgorithm, ChainingMode.cbc, ivBytes, Cipher.DECRYPT_MODE, "PKCS5Padding"); |
| return new CipherInputStream(fis, ciDec); |
| } |
| } |