| /* |
| * ==================================================================== |
| * 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.crypt.examples; |
| |
| import java.io.InputStream; |
| |
| import org.apache.poi.poifs.crypt.Decryptor; |
| import org.apache.poi.poifs.crypt.EncryptionInfo; |
| import org.apache.poi.poifs.filesystem.POIFSFileSystem; |
| import org.apache.poi.util.IOUtils; |
| |
| public class EncryptionUtils { |
| private EncryptionUtils() { |
| } |
| |
| public static InputStream decrypt(final InputStream inputStream, final String pwd) throws Exception { |
| try { |
| POIFSFileSystem fs = new POIFSFileSystem(inputStream); |
| EncryptionInfo info = new EncryptionInfo(fs); |
| Decryptor d = Decryptor.getInstance(info); |
| if (!d.verifyPassword(pwd)) { |
| throw new RuntimeException("incorrect password"); |
| } |
| return d.getDataStream(fs); |
| } finally { |
| IOUtils.closeQuietly(inputStream); |
| } |
| } |
| } |