Unfortunately, most methods (for example, sign (), verify (), encrypt (), and decrypt ()) are not yet implemented (at the time of writing) in the OpenPGP stone, which makes it useless.
I also found gpgr ( https://github.com/HHRy/gpgr ) to not be useful.
I use gpg-me ( https://github.com/ueno/ruby-gpgme/ ) to sign emails. At least it works great for this.
I did not try to decrypt the files, but a brief overview of the source codes suggests that it will also work.
fex
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