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binascii.a2b_base64 strict mode accepts invalid base64 input #118314
Description
Bug report
Bug description:
>>> import binascii
>>> f = lambda s: binascii.a2b_base64(s, strict_mode=True)
>>> f('AAAA')
b'\x00\x00\x00'
>>> f('AAAA=')
b'\x00\x00\x00'
>>> f('AAAA==')
b'\x00\x00\x00'
>>> f('AAAA===')
b'\x00\x00\x00'
>>> f('AAAA====')
b'\x00\x00\x00'
>>> f('AAAA=====')
b'\x00\x00\x00'Doc/library/binascii.rst defines that a valid base64 "Contains no excess data after padding (including excess padding, newlines, etc.)". However, current implement does not handle the edge case of excess padding after no padding.
CPython versions tested on:
3.12
Operating systems tested on:
macOS
Activity
[-]binascii.a2b_base64 with strict_mode=True accepts invalid base64 input[/-][+]binascii.a2b_base64 strict mode accepts invalid base64 input[/+]gh-118314: Fix padding edge case in binascii.a2b_base64 strict mode (G…
pythongh-118314: Fix padding edge case in binascii.a2b_base64 strict …
[3.12] gh-118314: Fix padding edge case in binascii.a2b_base64 strict…
pythongh-118314: Fix padding edge case in binascii.a2b_base64 strict …