Comment by MichaelMoser123

i have my vim extension for the purpose of keeping some private notes: https://github.com/MoserMichael/vimcrypt2

You don't have to re-enter the key during each save, the plugin keeps the key during the vim session in an encrypted form (encrypted with a temp key).

The vim extension is using openssl for aes encryption (using aes-256-ecb - so if a part of the file gets damaged then you won't loose the whole file)

(oh, vim -x seems to be doing something similar, they use blowfish as the default. I am not hashing the text in order to verify its authenticity, probably should add that to my vim extension)