├── _config.yml
├── .gitattributes
├── .gitignore
├── example.pdf
├── example.png
├── fingerprint.tex
└── README.md


/_config.yml:
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1 | theme: jekyll-theme-slate


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/.gitattributes:
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1 | *.html linguist-documentation
2 | 


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/.gitignore:
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1 | fingerprint.pdf
2 | fingerprint-plain.txt
3 | 


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/example.pdf:
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https://raw.githubusercontent.com/vog/fingerprint/HEAD/example.pdf


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/example.png:
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https://raw.githubusercontent.com/vog/fingerprint/HEAD/example.png


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/fingerprint.tex:
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 1 | \documentclass[a4paper,12pt]{scrartcl} % 2>/dev/null || <<'\end{document}'
 2 | 
 3 | % Key ID to print
 4 | \newcommand{\keyid}{5F8990AF}
 5 | 
 6 | % Number of repetitions
 7 | \newcommand{\repetitions}{8}
 8 | 
 9 | % Author: Volker Diels-Grabsch <v@njh.eu>
10 | % This code is public domain.
11 | 
12 | \usepackage[hmargin=1.5cm,vmargin=1cm]{geometry}
13 | \usepackage{xcolor,forloop}
14 | \usepackage{listings}
15 | \lstset{basicstyle=\footnotesize}
16 | \lstset{frame=shadowbox}
17 | \lstset{rulesepcolor=\color{gray}}
18 | \lstset{breaklines=true, breakatwhitespace=true}
19 | \begin{document}
20 | \immediate\write18{gpg2 --fingerprint \keyid >fingerprint-plain.txt}
21 | \lstinputlisting{fingerprint-plain.txt}
22 | \newcounter{ct}
23 | \forloop{ct}{1}{\value{ct}<\repetitions}{\vfill
24 | \lstinputlisting{fingerprint-plain.txt}}
25 | \end{document}
26 | 
27 | # Configure shell to abort in case of an unexpected error
28 | set -e
29 | 
30 | # Generate PDF
31 | pdflatex --shell-escape fingerprint.tex
32 | 
33 | # Remove temporary files
34 | rm -f fingerprint.aux fingerprint.log fingerprint-plain.txt
35 | 


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/README.md:
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 1 | ## Instructions
 2 | 
 3 | Print your GPG key fingerprint with LaTeX, and be better prepared for
 4 | [ad hoc signings](http://keysigning.org/methods/adhoc) at the next
 5 | [key signing party](https://en.wikipedia.org/wiki/Key_signing_party)!
 6 | 
 7 | Install LaTeX with <code>koma-script</code> and <code>forloop</code>
 8 | if haven't already done so.  On Debian based systems, the installation
 9 | command is:
10 | 
11 | ```
12 | apt-get install texlive-latex-extra
13 | ```
14 | 
15 | Download the LaTeX code which is public domain:
16 | 
17 | * [fingerprint.tex](fingerprint.tex)
18 | 
19 | Adjust the key ID so it will print your own key rather than mine.
20 | Also adjust the number of repetitions to fill the page:
21 | 
22 | ```
23 | % Key ID to print
24 | \newcommand{\keyid}{5F8990AF}
25 | 
26 | % Number of repetitions
27 | \newcommand{\repetitions}{8}
28 | ```
29 | 
30 | Finally, generate the PDF file:
31 | 
32 | ```
33 | sh fingerprint.tex
34 | ```
35 | 
36 | The [result](#result) is shown below. Have fun!
37 | 
38 | ## Related Projects
39 | 
40 | * `gpg-key2ps` from the [signing-party](https://packages.debian.org/sid/signing-party) package
41 | 
42 | ## Internals
43 | 
44 | The short command `sh fingerprint.tex` works because the LaTeX code is
45 | written in a special way, so
46 | [it is also a working shell script](http://www.profv.de/literate-programming/)
47 | which executes `pdflatex` and removes all temporary files.
48 | Of course, you can also call `pdflatex` by hand. In that case, don't
49 | forget to provide the `--shell-escape` option, otherwise the LaTeX file
50 | isn't allowed to run `GPG` to retrieve your key fingerprint:
51 | 
52 | ```
53 | pdflatex --shell-escape fingerprint.tex
54 | ```
55 | 
56 | ## Result
57 | 
58 | [![example.png](example.png)](example.pdf)
59 | 
60 | (In case you want to know, the preview image was generated with
61 | [GraphicsMagick](http://www.graphicsmagick.org/):
62 | `gm convert -density 60 example.pdf example.png`)
63 | 


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