Encrypt / Decrypt text file

Hello, I have a text file to crypt, send with ftp and decrypt on my server (If I'll need).

I'm looking for a easier way to do it, I'm a noob with C++ and isn't very easy understand how can I do it. I tried many source code but I didn't found direct crypt on files, I found crypt on 'word/sentence' but not file .txt.

Alghorytm is the same for me.. aes xor etc is the same but I didn' t find source code working for me.

Have you some advice?

Thank you.
Load whole file into memory and treat it as one big sentence.
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