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

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   this work for additional information regarding copyright ownership.
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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.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.GeneralSecurityException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

import javax.crypto.Cipher;

import org.apache.poi.POIDataSamples;
import org.apache.poi.poifs.filesystem.DirectoryNode;
import org.apache.poi.poifs.filesystem.NPOIFSFileSystem;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.apache.poi.util.IOUtils;
import org.apache.poi.xssf.XSSFTestDataSamples;
import org.junit.Assume;
import org.junit.Test;

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.getRoot(), 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.getRoot(), d);
    }

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

        while (true) {
            ZipEntry entry = zin.getNextEntry();
            if (entry==null) break;
            // crc32 is checked within zip-stream
            if (entry.isDirectory()) continue;
            zin.skip(entry.getSize());
            byte buf[] = new byte[10];
            int readBytes = zin.read(buf);
            // zin.available() doesn't work for entries
            assertEquals("size failed for "+entry.getName(), -1, readBytes);
        }
        
        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();
    }

    @Test
    public void test58616() throws IOException, GeneralSecurityException {
        POIFSFileSystem pfs = new POIFSFileSystem(new FileInputStream(XSSFTestDataSamples.getSampleFile("58616.xlsx")));                
        EncryptionInfo info = new EncryptionInfo(pfs);             
        Decryptor dec = Decryptor.getInstance(info);   
        //dec.verifyPassword(null);
        dec.getDataStream(pfs);
    }

    @Test
    public void bug60320() throws IOException, GeneralSecurityException {
        int maxKeyLen = Cipher.getMaxAllowedKeyLength("AES");
        Assume.assumeTrue("Please install JCE Unlimited Strength Jurisdiction Policy files for AES 256", maxKeyLen == 2147483647);

        InputStream is = POIDataSamples.getPOIFSInstance().openResourceAsStream("60320-protected.xlsx");
        POIFSFileSystem fs = new POIFSFileSystem(is);
        is.close();

        EncryptionInfo info = new EncryptionInfo(fs);

        Decryptor d = Decryptor.getInstance(info);

        boolean b = d.verifyPassword("Test001!!");
        assertTrue(b);

        zipOk(fs.getRoot(), d);
        
        fs.close();
    }    
}