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February 12, 2020 14:28
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Backup GPG key
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| #!/bin/sh -e | |
| if [[ $# -ne 1 ]] ; then | |
| cat - <<HELP | |
| usage: $0 <gpg secret key id> | |
| Generates a printable PDF file <gpg secret key id>-backup.pdf for the given key id. | |
| HELP | |
| exit 1 | |
| fi | |
| KEY_ID=$1 | |
| gpg --export-secret-keys $1 | paperkey > $KEY_ID.txt | |
| enscript -p - $KEY_ID.txt | ps2pdf - > $KEY_ID.pdf | |
| cat $KEY_ID.txt | split -b 1200 - $KEY_ID-part- | |
| for part in $KEY_ID-part-*; do | |
| qrencode -l H -r $part -o $part.png | |
| convert $part.png -background white -alpha remove -alpha off $part-opaque.png | |
| img2pdf -o $part.pdf $part-opaque.png | |
| done | |
| convert $KEY_ID.pdf $KEY_ID-part-*.pdf $KEY_ID-backup.pdf | |
| rm $KEY_ID.* | |
| rm $KEY_ID-part-* |
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