https://issues.apache.org/bugzilla/show_bug.cgi?id=52690
p...@spencer.es changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEEDINFO |NEW
--- Comment #3 from p...@spencer.es 2012-02-20 21:52:28 UTC ---
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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