Gpg

macOS install

brew install pgp

Gen key

gpg --gen-key

List keys

gpg --list-keys

Import key

gpg --import name_of_pub_key_file
gpg --sign-key email@example.com

Export key

gpg --export --armor email@example.com

Encrypt file

gpg --encrypt --sign --armor -r person@email.com name_of_file

Decrypt file

gpg --output name_of_file --decrypt name_of_file.asc

OpenSSH2GPG

ssh-keygen -t rsa -f rsa
openssl req -new -x509 -key ~/.ssh/id_rsa -out ssh-cert.pem
openssl pkcs12 -export -in ssh-cert.pem -inkey ~/.ssh/id_rsa -out ssh-key.p12
gpgsm --import ssh-key.p12