Unzipping a password-protected file

Maimun Ahmed · 03-19-2024, 12:46 PM

Hi there guys, thanks for all your lovely support in helping me outwith my project. Lately I am thinking of making a KOReader plugin (keeping its details a suspense as for now

).

For that, I wanted to know if I could unzip a password protected file. I have heard of a library named luazip but I think it doesn't support unzipping password protected files. Am I left with an option.

Frenzie · 03-19-2024, 03:25 PM

zlib is included, so in theory you can do some wrapper stuff around it. See here for writing zips:
https://github.com/koreader/koreader.../zipwriter.lua

And here is a wrapper in C that also deals with crypt/decrypt. It probably doesn't make an awful lot of sense to ship that with KOReader; at least as a first step I mean that more as inspiration to write it in LuaJIT instead.
https://github.com/zlib-ng/minizip-ng

Although fwiw some bindings for minizip already exist too:
https://github.com/luapower/minizip/

Though come to think of it, maybe you could outsource decryption to OpenSSL, which is also already included.

03-19-2024, 12:46 PM	#1
Maimun Ahmed Mr. Developer Posts: 24 Karma: 10 Join Date: Feb 2024 Device: Kindle Voyage	Unzipping a password-protected file Hi there guys, thanks for all your lovely support in helping me outwith my project. Lately I am thinking of making a KOReader plugin (keeping its details a suspense as for now ). For that, I wanted to know if I could unzip a password protected file. I have heard of a library named luazip but I think it doesn't support unzipping password protected files. Am I left with an option.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Password protected zip file ?	jlb	KOReader	0	07-11-2022 08:31 AM
Libra Can some books be password protected?	JJ Johnson	Kobo Reader	3	10-17-2020 12:20 PM
Password-protected PDF	kamichai	Conversion	4	06-21-2018 07:15 PM
Password protected purchases	SameOldStory	Kindle Fire	16	05-13-2012 04:53 PM
Convert password protected mobipocket file	Ea	Kindle Formats	1	10-11-2009 06:53 AM

03-19-2024, 03:25 PM	#2
Frenzie Wizard Posts: 1,676 Karma: 730583 Join Date: Oct 2014 Location: Antwerp Device: Kobo Aura H2O	zlib is included, so in theory you can do some wrapper stuff around it. See here for writing zips: https://github.com/koreader/koreader.../zipwriter.lua And here is a wrapper in C that also deals with crypt/decrypt. It probably doesn't make an awful lot of sense to ship that with KOReader; at least as a first step I mean that more as inspiration to write it in LuaJIT instead. https://github.com/zlib-ng/minizip-ng Although fwiw some bindings for minizip already exist too: https://github.com/luapower/minizip/ Though come to think of it, maybe you could outsource decryption to OpenSSL, which is also already included.

Advert