Question: can pypdf decrypt 128/256 AES without PyCryptodome

[JeffBarrette]

The document suggests (to me) its possible. Am I misunderstanding?

Pypdf help: https://pypdf.readthedocs.io/en/stable/user/encryption-decryption.html

I can work successfully with 128-RC4 PDFs but with

128-AES:

reader2 = PdfReader("AcrobatPro_128AES.pdf")
if reader2.is_encrypted:
    reader2.decrypt("Layout_128AES")
print(reader2.metadata) ###FAILS HERE
pypdf.errors.DependencyError: PyCryptodome is required for AES algorithm

256-AES it fails even sooner:

Reader3 = PdfReader("AcrobatPro_256AES.pdf")
pypdf.errors.DependencyError: PyCryptodome is required for AES algorithm

[pubpub-zz]

In any case pypdf uses pyCryptodome for crypt/decrypt files. please install it first.

Until now pypdf was only capable of decoding AES files ; writing AES encrypted files was not possible. the PR to introduce this major improvement is in the pipe (#1918)