[issue34546] Add encryption support to zipfile

[大野隆弘]

大野隆弘  added the comment:

My original reason of this is supporting Windows Explore decryption.
That doesn't support AES but support only this traditional PKWARE
encryption.
In my work, some recipients who received the zip file cannot install 3rd
party tools on their Windows
https://blogs.msdn.microsoft.com/oldnewthing/20180515-00/?p=98755

But as Christian explained for me in below thread, I understand we should
use 3rd party module for this purpose
https://mail.python.org/pipermail/python-dev/2018-September/155091.html

Thanks and Regards,
---
Takahiro Ono

2018年9月8日(土) 6:34 Serhiy Storchaka :

>
> Change by Serhiy Storchaka :
>
>
> --
> resolution:  -> rejected
> stage: patch review -> resolved
> status: open -> closed
>
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> Python tracker 
> <https://bugs.python.org/issue34546>
> ___
>

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[issue34546] Add encryption support to zipfile

[大野隆弘]

大野隆弘  added the comment:

Agree, we should not enhance weak encryption to the world.
But unfortunately, MS Windows supports only this type of encryption as far as I 
researched.
https://blogs.msdn.microsoft.com/oldnewthing/20180515-00/?p=98755

That is the my first motivation of Traditional PKWARE encryption(a.k.a  
ZipCrypto/Standard Zip 2.0 encryption) support.
If this big platform supports AES, we don't have any reason to support. But 
unfortunately not.


On the other hand, encryption algorithm compromising happens forever.
I believe python developers must have ability to make decision of suitable 
algorithm because "We are all (consenting) adults here".(I love this phrase)

Also implementing other algo (including AES) support must affect to decryption 
of zipfile module. 
As we can imagine it should be big task and should be divided.

These are the background of my suggestion.

In summary, 
 1. We don't have to support "weak" encryption like DES/RC2 although they are 
on the document.
 2. But Traditional PKWare Encryption is special enough to support because of 
the circumstances.
 3. Other algo support in both decrypt/encrypt should be implemented sooner or 
later.

Any feedback is welcome.


FYI  : All candidate of Zip encryption
-
(Traditional PKWARE encryption)
+
0x6601 - DES
0x6602 - RC2 (version needed to extract < 5.2)
0x6603 - 3DES 168
0x6609 - 3DES 112
0x660E - AES 128 
0x660F - AES 192 
0x6610 - AES 256 
0x6702 - RC2 (version needed to extract >= 5.2)
0x6720 - Blowfish
0x6721 - Twofish
0x6801 - RC4

https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT
7.2.3.2 AlgId

-

FYI 2. Other languages/tools support

Perl : "Support Encryption" is in TODO 
https://metacpan.org/pod/Archive::Zip

Go : Both (AES/Traditional) encryption is going to be integrated( discussion 
was suspended?)
https://github.com/golang/go/issues/12081

Ruby : Supports as experimental
https://github.com/rubyzip/rubyzip/blob/master/README.md


WinZip : Supports but not recommended.
http://kb.winzip.com/help/help_encryption.htm

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[issue34546] Zipfile encryption function

[大野隆弘]

New submission from 大野隆弘 :

from https://mail.python.org/pipermail/python-ideas/2018-August/053081.html

I would like to use zipfile encryption as python standard library.
https://github.com/python/cpython/blob/master/Lib/zipfile.py

Below document says "currently" cannot.
https://github.com/python/cpython/blob/master/Doc/library/zipfile.rst
"but it currently cannot create an encrypted file."

Current pythonians like me have to use 3rd party like below, but I believe it 
is worth to include.
https://pypi.org/project/pyminizip/
https://github.com/wllm-rbnt/py-zipcrypt

--
components: Library (Lib)
messages: 324372
nosy: 大野隆弘
priority: normal
severity: normal
status: open
title: Zipfile encryption function
type: enhancement

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