I need to zip and password-protect a file. Is there a good (free) library for this?
This needs to be opened by a third party, so the password protection needs to work with standard tools.
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I need to zip and password-protect a file. Is there a good (free) library for this?
This needs to be opened by a third party, so the password protection needs to work with standard tools.
UPDATE 2020: There are other choices now, notably Zip4J.
After much searching, I’ve found three approaches:
A freely available set of source code, suitable for a single file zip. However, there is no license. Usage is AesZipOutputStream.zipAndEcrypt(…). http://merkert.de/de/info/zipaes/src.zip (https://forums.oracle.com/forums/thread.jspa?threadID=1526137)
UPDATE: This code is now Apache licensed and released at https://github.com/mobsandgeeks/winzipaes (exported from original home at Google code) . It worked for me (one file in the zip), and fills a hole in Java’s opens source libraries nicely.
A commercial product ($500 at the time of writing). I can’t verify if this works, as their trial license approach is complex. Its also a ported .NET app: http://www.nsoftware.com/ipworks/zip/default.aspx
A commercial product ($290 at the time of writing). Suitable only for Wnidows as it uses a dll: http://www.example-code.com/java/zip.asp