Hi everyone, I’m working on a school project due the day after tomorrow, and I really need help with implementing AES-128 encryption and decryption for files in Python without using any external libraries.

So far, I’ve managed to get the encryption part working (or at least I think it’s correct), but I’m completely stuck on decryption. I’m not sure if the issue is because of something in the encryption step or if there’s a problem in how I’m handling the decryption.

Here’s what’s happening:

• I feel completely lost, and I’m running out of time—any guidance on implementing AES-128 decryption without a library would be a huge help.

Any tips, resources, or even an outline of the decryption process would mean a lot. Thanks in advance for your help!