Auth beyond filesystem
$ cat a.txt
> hello啊 world 你是大傻逼123 ahah
$ fa lock *.txt
password> (type one)
$ cat a.txt
> 77de54ccf56eb6f7dbf99e4d3be949ab9e˥ΟFʿ84ݧÓϖX�óÔIúèKÚÚF³ëKåô9298i81Ûǟm
$ fa auth *.txt
password> (type randomly)
> [ [ 'a.txt', 'auth fail' ] ]
$ fa auth *.txt
password> (type correctly)
$ cat a.txt
> hello啊 world 你是大傻逼123 ahah
$ npm i -g fs-auth
$ fa lock *.txt
$ fa auth *.jpg
$ npm i fs-auth
var fa = require('fs-auth')
var encryptedBuf = fa.lock(originalBuf, pwd)
var _originalBuf = fs.auth(encryptedBuf, pwd)