Unzipping a password-protected file

Maimun Ahmed · 03-19-2024, 11:46 AM

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, 02:25 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, 11:46 AM	#1
Maimun Ahmed Mr. Developer Posts: 23 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.

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03-19-2024, 02:25 PM	#2
Frenzie Wizard Posts: 1,619 Karma: 724945 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.