[Python-Dev] AES cipher implementation in standard library

Christian Heimes christian at python.org
Tue Sep 4 12:48:43 EDT 2018

On 2018-09-04 16:37, 大野隆弘 wrote:
> Dear all,
> Have we tried cipher implementation includes AES as a standard library
> in the past?
> https://docs.python.org/3.6/library/crypto.html
> if possible I want to try to implement AES because famous 3rd party
> library is not maintained and general cipher programs should be used for
> multiple purpose.Though the implementation is tough,  I believe this
> should be worth to it.
> In my case, I want to use AES implementation for zipfile module.

strong -1

The Python standard library doesn't contain any encryption, signing, and
other cryptographic algorithms for multiple reasons. The only exception
from the rule are hashing algorithms and HMAC construct. There are legal
implications like export restrictions. Crypto is just too hard to get
right and we don't want to give the user additional rope. We already had
a very lengthy and exhausting discussion for the secrets module. That
module just provides a user-friendly interface to CPRNG.

By the way, AES by itself is a useless to borderline dangerous
algorithm. It must be embedded within additional layers like block mode,
authenticated encryption / MAC, and more. There isn't a single correct
answer for block mode and AD algorithm, too. It highly depends on the
problem space. While GCM AEAD mode is good choice for network
communication, it can be a pretty bad idea for persistent storage.

There is one excellent Python library with high level and low level
cryptographic algorithms: http://cryptography.readthedocs.io/ . It's t


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