Symmetrically encrypt a file with ChaCha20 using Argon2 KDF
IMPORTANT NOTE: DO NOT ACTUALLY USE THIS FOR ANYTHING!!!
This is just me screwing around with stuff, and not intended to actually secure secrets. Just use scrypt or something real.
Most importantly: DON'T
# encrypt:
$ chargon e < secret.txt > secret.txt.enc
# decrypt:
$ chargon d < secret.txt.enc > secret.txt