[New-bugs-announce] [issue42628] binascii doesn't work on some base64

Kent Watsen report at bugs.python.org
Sat Dec 12 16:23:18 EST 2020

New submission from Kent Watsen <kent+python2 at watsen.net>:

[Tested on 3.8.2 and 3.9.0, bug may manifest in other versions too]

The IETF sometimes uses the dummy base64 value "base64encodedvalue==" in specifications in lieu of a block of otherwise meaningless b64.  

Even though it is a dummy value, the value should be convertible to binary and back again.  This works using the built-in command `base64` as well as OpenSSL command line, but binascii is unable to do it.  See below:

$ echo "base64encodedvalue==" | base64 | base64 -d

$ echo "base64encodedvalue==" | openssl enc -base64 -A | openssl enc -d base64 -A

$ printf "import binascii\nprint(binascii.b2a_base64(binascii.a2b_base64('base64encodedvalue=='), newline=False).decode('ascii'))" |  python -

After some investigation, it appears that almost any valid base64 matching the pattern "??==" fails.  For instance:

$ printf "import binascii\nprint(binascii.b2a_base64(binascii.a2b_base64('ue=='), newline=False).decode('ascii'))" |  python -                                                           

$ printf "import binascii\nprint(binascii.b2a_base64(binascii.a2b_base64('aa=='), newline=False).decode('ascii'))" |  python -                                                           

$ printf "import binascii\nprint(binascii.b2a_base64(binascii.a2b_base64('a0=='), newline=False).decode('ascii'))" |  python -                                                           

Is this a bug?

messages: 382922
nosy: kwatsen2
priority: normal
severity: normal
status: open
title: binascii doesn't work on some base64
type: behavior
versions: Python 3.8, Python 3.9

Python tracker <report at bugs.python.org>

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