GNU Privacy Guard (GPG or GnuPG) is free encryption software that’s compliant with the OpenPGP Can be used for both asymmetric and symmetric encryption.

Installation

homebrew

1. install gpg with brew
brew install gpg

2. verify gpg was installed
which gpg

3. ~/.gnupg directory will created when generating gpg keys

Commands

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1. generate key
gpg —gen-key
gpg —full-generate-key

2. list keys to get the key hash
gpg —list-key

3. export public key based on key hash
gpg —output ~/RPM-GPG-KEY-demo-s3-rpm-repo —armor —export KEY_HASH_HERE

4. export private key based on key hash
gpg —output ~/RPM-GPG-KEY-demo-s3-rpm-repo.private —export-secret-key -armor KEY_HASH_HERE

5. import public key
sudo rpm —import ~/RPM-GPG-KEY-demo-s3-rpm-repo