[Debian-uk] GPG keys and QR codes
liw at liw.fi
Sun Aug 18 15:27:17 BST 2013
On Sun, Aug 18, 2013 at 11:43:05AM +0100, Lars Wirzenius wrote:
> I've attached a quick hack to do what Colin suggests. There may be
> existing tools, but it's Sunday morning and if I can't NIH on a
> Sunday morning, when can I?
Well, that was an utter failure... Colin pointed out that I had
shell script quoting problems of my own.
http://paste.debian.net/26612/ (and attached) should be a fixed
http://www.cafepress.com/trunktees -- geeky funny T-shirts
http://gtdfh.branchable.com/ -- GTD for hackers
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# A small script to produce a PDF with key slips for exchanging PGP
# key information for key signing purposes.
# Requires gpg, qrencode, and pandoc (with TeX stuff).
# Usage: $0 keyid...
trap 'rm -f "$temp"' EXIT
for keyid in "$@"
# Save key info to a file.
keyinfo=$(gpg --fingerprint "$keyid")
# Generate QR code for key info.
qrencode "$keyinfo" -o "$keyid.png"
# Create the Markdown document.
# Indent the key info by four spaces, so its a code block.
echo "$keyinfo" | sed 's/^/ /' > "$keyid.mdwn"
# Include the QR code.
cat <<EOF >> "$keyid.mdwn"
![Key information as QR]($keyid.png)\\
# Duplicate it a few times to have many keyslips per page. With
# my key, experimentation shows only one slip will fit on one
# page. That's obviously dependent on how many usernames a key
# has, etc.
# Someone who understands pandoc better might tweak margins and
# font sizes enough that more can be fit on the page. Or someone
# could do the formatting with another tool, which could allow
# for a tighter layout.
for i in $(seq 1)
# Produce a PDF.
pandoc -f markdown -o "$keyid.pdf" "$keyid.mdwn"
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