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#!/usr/bin/env bash
# Export all GPG keys and revocation certificates to an encrypted backup
# file, or decrypt and import them back from one.
set -euo pipefail
info() { printf '\033[1;34m==>\033[0m %s\n' "$*"; }
warn() { printf '\033[1;33m==> warning:\033[0m %s\n' "$*" >&2; }
error() { printf '\033[1;31m==> error:\033[0m %s\n' "$*" >&2; }
die() { error "$*"; exit 1; }
WORKDIR="$(mktemp -d)"
cleanup() {
if [[ -d "$WORKDIR" ]]; then
find "$WORKDIR" -type f -exec shred -u -z {} \; 2>/dev/null || true
rm -rf "$WORKDIR"
fi
}
trap cleanup EXIT
usage() {
echo "Usage: $0 <export|import> <filename>"
echo ""
echo "Commands:"
echo " export Export all GPG keys to an encrypted file"
echo " import Decrypt and import keys from a backup file"
exit 1
}
do_export() {
local outfile="$1"
if [[ -e "$outfile" ]]; then
die "Refusing to overwrite existing file: $outfile"
fi
info "Exporting public keys..."
gpg --export --armor > "$WORKDIR/public-keys.asc"
info "Exporting secret keys..."
gpg --export-secret-keys --armor > "$WORKDIR/secret-keys.asc"
info "Exporting secret subkeys (if any)..."
gpg --export-secret-subkeys --armor > "$WORKDIR/secret-subkeys.asc" || true
info "Exporting owner trust database..."
gpg --export-ownertrust > "$WORKDIR/ownertrust.txt"
info "Exporting revocation certificates..."
mkdir -p "$WORKDIR/revocation-certs"
if [[ -d "$HOME/.gnupg/openpgp-revocs.d" ]]; then
cp "$HOME"/.gnupg/openpgp-revocs.d/*.rev "$WORKDIR/revocation-certs/" 2>/dev/null || true
fi
info "Bundling everything into a single archive..."
tar -C "$WORKDIR" -cf "$WORKDIR/gpg-full-backup.tar" \
public-keys.asc \
secret-keys.asc \
secret-subkeys.asc \
ownertrust.txt \
revocation-certs
info "Encrypting with GPG (AES256, SHA512, max S2K iteration count)..."
echo " You will be prompted for a passphrase — use a strong one."
gpg --symmetric \
--cipher-algo AES256 \
--digest-algo SHA512 \
--s2k-mode 3 \
--s2k-digest-algo SHA512 \
--s2k-count 65011712 \
--output "$outfile" \
"$WORKDIR/gpg-full-backup.tar"
info "Verifying: attempting decryption to confirm it works..."
if gpg --decrypt "$outfile" > "$WORKDIR/verify.tar" 2>/dev/null; then
if cmp -s "$WORKDIR/gpg-full-backup.tar" "$WORKDIR/verify.tar"; then
info "Verification succeeded: backup decrypts correctly."
else
die "Decrypted content does not match original. Investigate before trusting this backup."
fi
else
die "Decryption test failed."
fi
echo
info "Done."
echo " Encrypted backup: $outfile"
echo " Store this file somewhere safe (offline media, encrypted drive)."
echo " The S2K iteration count only helps if your passphrase itself"
echo " has real entropy (e.g. a long diceware passphrase)."
}
do_import() {
local infile="$1"
if [[ ! -f "$infile" ]]; then
die "File not found: $infile"
fi
info "Decrypting $infile ..."
echo " You will be prompted for the backup's passphrase."
echo " Note: this may take a while due to the high S2K iteration count."
gpg --decrypt "$infile" > "$WORKDIR/gpg-full-backup.tar"
info "Extracting archive..."
tar -C "$WORKDIR" -xf "$WORKDIR/gpg-full-backup.tar"
info "Importing public keys..."
gpg --import "$WORKDIR/public-keys.asc"
info "Importing secret keys..."
gpg --import "$WORKDIR/secret-keys.asc"
if [[ -s "$WORKDIR/secret-subkeys.asc" ]]; then
info "Importing secret subkeys..."
gpg --import "$WORKDIR/secret-subkeys.asc" || true
fi
if [[ -f "$WORKDIR/ownertrust.txt" ]]; then
info "Importing owner trust database..."
gpg --import-ownertrust "$WORKDIR/ownertrust.txt"
fi
if [[ -d "$WORKDIR/revocation-certs" ]] && [[ -n "$(ls -A "$WORKDIR/revocation-certs" 2>/dev/null)" ]]; then
info "Restoring revocation certificates..."
mkdir -p "$HOME/.gnupg/openpgp-revocs.d"
cp "$WORKDIR"/revocation-certs/*.rev "$HOME/.gnupg/openpgp-revocs.d/" 2>/dev/null || true
fi
echo
info "Done. Keys imported into your GPG keyring."
echo " Run 'gpg --list-secret-keys' to confirm."
}
# Main
if [[ $# -ne 2 ]]; then
usage
fi
command="$1"
filename="$2"
case "$command" in
export)
do_export "$filename"
;;
import)
do_import "$filename"
;;
*)
usage
;;
esac
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