ValueError: Data must be padded to 16 byte boundary in CBC mode (Issue in PyPDF2 2.11.1)

[peletiah]

Just as a heads-up in case someone else encounters this issue.

While parsing several hundred files, I got this error-message for many of these files:
ValueError: Data must be padded to 16 byte boundary in CBC mode

This is an issue in the upstream PyPDF2-package at least in version 2.11.1.

There's a bug-report in the PyPDF2-repo and a 3-line quickfix has already been commited. I've modified PyPDF2/_encryption.py in my local site-package accordingly and no longer see the error. I assume the patch will soon be published in a package as well.

My PyPDF2-version is 2.11.1

Here's the full traceback for reference.

Traceback (most recent call last):
  File "/home/benke/workspace/solarkeymark_importer/parse_certificate.py", line 91, in <module>
    tables = camelot.read_pdf(f"{pdf_dir}{file}", pages='1-end', line_scale=110, shift_text=[''])
  File "/home/benke/workspace/solarkeymark_importer/lib/python3.10/site-packages/camelot/io.py", line 113, in read_pdf
    tables = p.parse(
  File "/home/benke/workspace/solarkeymark_importer/lib/python3.10/site-packages/camelot/handlers.py", line 169, in parse
    self._save_page(self.filepath, p, tempdir)
  File "/home/benke/workspace/solarkeymark_importer/lib/python3.10/site-packages/camelot/handlers.py", line 117, in _save_page
    outfile.write(f)
  File "/home/benke/workspace/solarkeymark_importer/lib/python3.10/site-packages/PyPDF2/_writer.py", line 841, in write
    self.write_stream(stream)
  File "/home/benke/workspace/solarkeymark_importer/lib/python3.10/site-packages/PyPDF2/_writer.py", line 814, in write_stream
    self._sweep_indirect_references(self._root)
  File "/home/benke/workspace/solarkeymark_importer/lib/python3.10/site-packages/PyPDF2/_writer.py", line 963, in _sweep_indirect_references
    data = self._resolve_indirect_object(data)
  File "/home/benke/workspace/solarkeymark_importer/lib/python3.10/site-packages/PyPDF2/_writer.py", line 1008, in _resolve_indirect_object
    real_obj = data.pdf.get_object(data)
  File "/home/benke/workspace/solarkeymark_importer/lib/python3.10/site-packages/PyPDF2/_reader.py", line 1231, in get_object
    retval = self._encryption.decrypt_object(
  File "/home/benke/workspace/solarkeymark_importer/lib/python3.10/site-packages/PyPDF2/_encryption.py", line 750, in decrypt_object
    return cf.decrypt_object(obj)
  File "/home/benke/workspace/solarkeymark_importer/lib/python3.10/site-packages/PyPDF2/_encryption.py", line 188, in decrypt_object
    obj[dictkey] = self.decrypt_object(value)
  File "/home/benke/workspace/solarkeymark_importer/lib/python3.10/site-packages/PyPDF2/_encryption.py", line 182, in decrypt_object
    data = self.strCrypt.decrypt(obj.original_bytes)
  File "/home/benke/workspace/solarkeymark_importer/lib/python3.10/site-packages/PyPDF2/_encryption.py", line 90, in decrypt
    d = aes.decrypt(data)
  File "/home/benke/workspace/solarkeymark_importer/lib/python3.10/site-packages/Crypto/Cipher/_mode_cbc.py", line 246, in decrypt
    raise ValueError("Data must be padded to %d byte boundary in CBC mode" % self.block_size)
ValueError: Data must be padded to 16 byte boundary in CBC mode