___ (while technically different, I have a loose use of terms like encrypt-encode; I'm not pedantic, and aware that they are different; bear with me, please :-) ) In its default mode, this tool will encrypt and decrypt any string you will pass as an argument.
With the `-f` parameter, you pass a source and destination filename, and it will AES-256 encode/decode the file. Simple: `encdec {encode|decode} $STRING`
Where $STRING is the string to encode or decode. Note that the decoded string will be output to stdout. Also simple: `encdec {encode|decode} $FILENAME` You need to provide the full source pathname. AES-256 needs a private key to encrypt and decrypt a file or string. There is a built-in key in the software that you can easily find browsing the source code.
I left it there for testing purposes, but for obvious security reasons, you should avoid using it.
If you want to use your own, the `-p` flag will prompt you eventually to provide your own key. You will need to safe-keep it somewhere, as there are no mechanisms to retreive it if lost. Also, note that the key _needs to be exactly 32bytes long_. You can either build from source, or use the provided binary packages (Alpine, RedHat, Debian) Once you've cloned the repo, go into the `src/` directory, and run `./upgrade_pkgs.sh` (about this, please note that package upgrades have not been tested beyond current versions, for obvious reasons).
After this step, you can run ./build.sh (providing an optional -o param with a target dir is available). This will build and copy the binary into /opt/bin
You might wish to strip the produced binary, as it still contains debugging code.
So, as an alternative, you can find the binary packages at https://github.com/jeanfrancoisgratton/encdec/releases