/*
* ====================================================================
* 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
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*/
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);
}
}
}