feat: Add AES Encryption/Decryption for User Login Credentials

[Anyel-ec]

No description provided.

[kesselb]

Hi and thanks for your pull request 👍

I'm confused by the pull request description. Everything you listed under "Changes" was already there?

Your pull request contains plenty of unrelated changes (e.g. adding an unused dependency, reformatting of files, removing of copyright headers). That makes reviewing your changes unnecessarily complicated.

Todos:

• Restore the copyright headers
• Remove the debugging code (the commented echos, init_set, error_reporting, etc.)
• Remove the unused/duplicate dependency (phpseclib is already a nextcloud dependency, see https://github.com/nextcloud/3rdparty/)
• Revert the unrelated changes (e.g., newlines, reformatting of files, etc.)
• Fix the failing unit tests

If the pull request is in a reviewable state, I can forward it to our security people.

[susnux]

What security benefit should this bring? The key is known so it is basically just (revertable) hiding the data if you sniff the packages. But meaning it does not add any security?

[github-actions]

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