https://issues.apache.org/bugzilla/show_bug.cgi?id=52690
--- Comment #4 from Yegor Kozlov <ye...@dinom.ru> 2012-02-23 12:06:04 UTC ---
Please attach a decrypted file so that we can test your code sample.
Yegor
(In reply to comment #3)
> Sorry, Buzilla and/or my browser lost my original description of the problem
>
> The issue is that the classic POI 'myDecrypt' method below in general produces
> output files that are considered corrupt by Micrososft Office
>
> If say you use MS Word to open a .docx file decrypted by this method you will
> get an error dialog saying the file is corrupt and asking if you would like
> attempt recovery (which incidentally will succeed)
>
> The problem is that the output length is too long. Output must be truncated to
> the length specified in the input data stream and currently discarded for
> example in "EcmaDecryptor>>getDataStream(DirectoryNode dir)"
>
> This is the offending line
>
> 128: long size = dis.readLong();
>
> The solution is to save this length in an instance variable of the class
> Decryptor so that it is accessible to user written code
> (Decryptor>>getLength()). Then myDecrypt method can then be modified to work
> correctly.
> =====
> private void myDecrypt(String filename, String password) throws
> FileNotFoundException, IOException {
> File inFile = new File(filename);
> File outFile = new File(new File(filename).getParentFile(),
> "Decrypted"
> + new File(filename).getName());
>
> System.err.println("Attempting to decrypt " + inFile.getAbsolutePath()
> + " to " + outFile.getAbsolutePath());
>
> POIFSFileSystem filesystem = new POIFSFileSystem(new
> FileInputStream(inFile));
> EncryptionInfo info = new EncryptionInfo(filesystem);
> Decryptor d = Decryptor.getInstance(info);
>
> try {
> if (!d.verifyPassword(password)) {
> throw new RuntimeException("Unable to process: wrong
> password");
> }
>
> InputStream dataStream = d.getDataStream(filesystem);
>
> OutputStream out = new FileOutputStream(outFile);
> byte buf[] = new byte[1024];
> int len;
> while ((len = dataStream.read(buf)) > 0)
> out.write(buf, 0, len);
> out.close();
> dataStream.close();
>
> } catch (GeneralSecurityException ex) {
> throw new RuntimeException("Unable to process encrypted document",
> ex);
> }
> System.err.println("Finished " + inFile.getAbsolutePath());
> }
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