poi/src/ooxml/testcases/org/apache/poi/poifs/crypt/TestDecryptor.java

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   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
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       http://www.apache.org/licenses/LICENSE-2.0

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   distributed under the License is distributed on an "AS IS" BASIS,
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   See the License for the specific language governing permissions and
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package org.apache.poi.poifs.crypt;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.security.GeneralSecurityException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

import org.apache.poi.POIDataSamples;
import org.apache.poi.poifs.filesystem.NPOIFSFileSystem;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.apache.poi.util.IOUtils;
import org.junit.Test;

/**
 *  @author Maxim Valyanskiy
 *  @author Gary King
 */
public class TestDecryptor {
    @Test
    public void passwordVerification() throws IOException, GeneralSecurityException {
        POIFSFileSystem fs = new POIFSFileSystem(POIDataSamples.getPOIFSInstance().openResourceAsStream("protect.xlsx"));

        EncryptionInfo info = new EncryptionInfo(fs);

        Decryptor d = Decryptor.getInstance(info);

        assertTrue(d.verifyPassword(Decryptor.DEFAULT_PASSWORD));
    }

    @Test
    public void decrypt() throws IOException, GeneralSecurityException {
        POIFSFileSystem fs = new POIFSFileSystem(POIDataSamples.getPOIFSInstance().openResourceAsStream("protect.xlsx"));

        EncryptionInfo info = new EncryptionInfo(fs);

        Decryptor d = Decryptor.getInstance(info);

        d.verifyPassword(Decryptor.DEFAULT_PASSWORD);

        zipOk(fs, d);
    }

    @Test
    public void agile() throws IOException, GeneralSecurityException {
        POIFSFileSystem fs = new POIFSFileSystem(POIDataSamples.getPOIFSInstance().openResourceAsStream("protected_agile.docx"));

        EncryptionInfo info = new EncryptionInfo(fs);

        assertTrue(info.getVersionMajor() == 4 && info.getVersionMinor() == 4);

        Decryptor d = Decryptor.getInstance(info);

        assertTrue(d.verifyPassword(Decryptor.DEFAULT_PASSWORD));

        zipOk(fs, d);
    }

    private void zipOk(POIFSFileSystem fs, Decryptor d) throws IOException, GeneralSecurityException {
        ZipInputStream zin = new ZipInputStream(d.getDataStream(fs));

        while (true) {
            ZipEntry entry = zin.getNextEntry();
            if (entry==null) {
                break;
            }

            while (zin.available()>0) {
                zin.skip(zin.available());
            }
        }
        
        zin.close();
    }

    @Test
    public void dataLength() throws Exception {
        POIFSFileSystem fs = new POIFSFileSystem(POIDataSamples.getPOIFSInstance().openResourceAsStream("protected_agile.docx"));

        EncryptionInfo info = new EncryptionInfo(fs);

        Decryptor d = Decryptor.getInstance(info);

        d.verifyPassword(Decryptor.DEFAULT_PASSWORD);

        InputStream is = d.getDataStream(fs);

        long len = d.getLength();
        assertEquals(12810, len);

        byte[] buf = new byte[(int)len];

        is.read(buf);

        ZipInputStream zin = new ZipInputStream(new ByteArrayInputStream(buf));

        while (true) {
            ZipEntry entry = zin.getNextEntry();
            if (entry==null) {
                break;
            }

            while (zin.available()>0) {
                zin.skip(zin.available());
            }
        }
    }

    @Test
    public void bug57080() throws Exception {
        // the test file contains a wrong ole entry size, produced by extenxls
        // the fix limits the available size and tries to read all entries 
        File f = POIDataSamples.getPOIFSInstance().getFile("extenxls_pwd123.xlsx");
        NPOIFSFileSystem fs = new NPOIFSFileSystem(f, true);
        EncryptionInfo info = new EncryptionInfo(fs);
        Decryptor d = Decryptor.getInstance(info);
        d.verifyPassword("pwd123");
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        ZipInputStream zis = new ZipInputStream(d.getDataStream(fs));
        ZipEntry ze;
        while ((ze = zis.getNextEntry()) != null) {
            bos.reset();
            IOUtils.copy(zis, bos);
            assertEquals(ze.getSize(), bos.size());
        }
        
        zis.close();
        fs.close();
    }
}