Automate GPG to generate a Curve25519 primary key, and Curve25519 subkeys for signing, encrypting and authenticating.

gpg-automate-full-generate-ec-keys.sh

#!/bin/bash

# Automate GPG to generate a Curve25519 primary key,
# and Curve25519 subkeys for signing, encrypting and authenticating.
#
# Developed for gpg (GnuPG) 2.2.12.
#
# Copyright (c) 2019 Michael Karl Franzl
#
# Copying and distribution of this file, with or without modification,
# are permitted in any medium without royalty provided the copyright
# notice and this notice are preserved.  This file is offered as-is,
# without any warranty.
#
# https://www.gnu.org/licenses/license-list#GNUAllPermissive

read -p 'Enter your full name: ' full_name
read -p 'Enter e-mail: ' email
read -s -p 'Enter Passphrase: ' passphrase

gpg_generate_key_args="--status-fd=2 --command-fd=0 --full-generate-key --expert --pinentry-mode loopback"
gpg_edit_key_args="--status-fd=2 --command-fd=0 --expert --pinentry-mode loopback --edit-key ${email}"

function create_primary_key {
gpg ${gpg_generate_key_args} << EOF
11
S
Q
1
50y
${full_name}
${email}
${passphrase}
EOF
}


function create_sign_subkey {
gpg ${gpg_edit_key_args} << EOF
addkey
10
1
2y
${passphrase}
save
EOF
}

function create_encrypt_subkey {
gpg ${gpg_edit_key_args} << EOF
addkey
12
1
2y
${passphrase}
save
EOF
}

function create_authenticate_subkey {
gpg ${gpg_edit_key_args} << EOF
addkey
11
S
A
Q
1
2y
${passphrase}
save
EOF
}

create_primary_key
create_sign_subkey
create_encrypt_subkey
create_authenticate_subkey