So far the tutorials I've seen are for encrypting text and then
decrypting it back.
So for example you have a
 plaintext = "some text"

you encrypt it and then you decrypt it depending on how you encrypted
it.

What I am looking for is to encrypt a whole file and then store it.
for example I allow my users to upload .doc/.xls files. I want to
encrypt those files so I would not store them like that, and in case a
user wants to download it back the app will decrypt it and then send
it to user.

How can I do this ?

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