New submission from Kent Watsen <[email protected]>:
[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
base64encodedvalue==
$ echo "base64encodedvalue==" | openssl enc -base64 -A | openssl enc -d base64
-A
base64encodedvalue==
$ printf "import
binascii\nprint(binascii.b2a_base64(binascii.a2b_base64('base64encodedvalue=='),
newline=False).decode('ascii'))" | python -
base64encodedvaluQ==
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 -
uQ==
$ printf "import
binascii\nprint(binascii.b2a_base64(binascii.a2b_base64('aa=='),
newline=False).decode('ascii'))" | python -
aQ==
$ printf "import
binascii\nprint(binascii.b2a_base64(binascii.a2b_base64('a0=='),
newline=False).decode('ascii'))" | python -
aw==
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
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Python tracker <[email protected]>
<https://bugs.python.org/issue42628>
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