├── Dockerfile
├── README.md
└── asc-to-gif.sh


/Dockerfile:
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1 | FROM ubuntu:trusty
2 | 
3 | RUN apt-get update
4 | RUN apt-get install -y imagemagick bash qrencode zbar-tools
5 | 
6 | ADD asc-to-gif.sh ./
7 | 
8 | CMD ./asc-to-gif.sh $SRC $DST
9 | 


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/README.md:
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 1 | # asc-key-to-qr-code-gif
 2 | 
 3 | A script that converts ASCII-armored PGP keys (or any texts) to a series of QR codes.  
 4 | 
 5 | This allows to transfer texts from a PC to other devices that can scan and
 6 | decode QR codes. The script was originally made for transfering keys into [Pass for iOS](https://github.com/mssun/passforios).
 7 | 
 8 | ## Dependencies
 9 | 
10 | 1. [libqrencode](http://fukuchi.org/works/qrencode/): Generate QR codes.
11 | 2. [imagemagick](https://www.imagemagick.org/script/index.php): Convert PNGs to GIF.
12 | 3. (Optional) [zbar](http://zbar.sourceforge.net): Read and test QR codes.
13 | 
14 | ## Usage
15 | 
16 | Execute `./asc-to-gif.sh input.txt output.gif`.
17 | 
18 | An example of exporting ASCII-armored PGP keys and generate QR codes.
19 | 
20 |     gpg --export -a "Key ID" > public.asc
21 |     gpg --export-secret-keys -a "Key ID" > private.asc
22 |     ./asc-to-gif.sh public.asc public.gif
23 |     ./asc-to-gif.sh private.asc private.gif
24 | 
25 | ### Docker
26 | 
27 | You can use [docker](https://docs.docker.com/) to perform the conversions:
28 | 
29 | ```
30 | docker build . -t asc-key-to-qr-code-gif
31 | docker run --rm -v $(pwd):/data -e "SRC=/data/public.asc" -e "DST=/data/public.gif" asc-key-to-qr-code-gif
32 | docker run --rm -v $(pwd):/data -e "SRC=/data/private.asc" -e "DST=/data/private.gif" asc-key-to-qr-code-gif
33 | ```
34 | 


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/asc-to-gif.sh:
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 1 | #!/usr/bin/env bash
 2 | 
 3 | # Check requirements
 4 | hash qrencode 2>/dev/null || { echo >&2 "Aborting: qrencode not installed"; exit 1; }
 5 | 
 6 | # Check argument
 7 | if [ $# -ne 2 ]; then
 8 |     echo "Usage: $0 <ascii armor key filename> <gif filename>"
 9 |     exit 1
10 | fi
11 | asc_filename=$1
12 | if [ ! -f ${asc_filename} ]; then
13 |     echo "Error: ${asc_filename} not found"
14 |     exit 1
15 | fi
16 | 
17 | # Settings
18 | gif_filename=$2
19 | gif_delay=100
20 | qrcode_size=1732
21 | qrcode_version=30
22 | 
23 | # Split the file
24 | rm -f ${asc_filename}.split*
25 | split -b ${qrcode_size} ${asc_filename} ${asc_filename}.split
26 | 
27 | # Generate png
28 | for f in ${asc_filename}.split*; do
29 |     qrencode -v ${qrcode_version} -o $f.png < $f
30 |     rm $f
31 | done
32 | 
33 | if hash zbarimg 2>/dev/null; then
34 |     # Check png
35 |     > ${asc_filename}.scanned
36 |     for f in ${asc_filename}.split*; do
37 |         printf %s "$(zbarimg --raw -q $f)" >> ${asc_filename}.scanned
38 |     done
39 |     printf %s "$(cat ${asc_filename})" | diff ${asc_filename}.scanned -
40 |     rm ${asc_filename}.scanned
41 | else
42 |     echo "Skip testing: zbarimg not installed"
43 | fi
44 | 
45 | # Convert to gif
46 | convert -delay ${gif_delay} ${asc_filename}.split* ${gif_filename}
47 | echo "Generated: ${gif_filename}"
48 | 
49 | # Clean up png
50 | rm ${asc_filename}.split*
51 | 
52 | 


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