mirror of
https://github.com/sunknudsen/privacy-guides.git
synced 2025-02-23 01:03:59 +00:00
133 lines
3.1 KiB
Bash
Executable File
133 lines
3.1 KiB
Bash
Executable File
#! /bin/bash
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set -e
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positional=()
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while [[ $# -gt 0 ]]; do
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argument="$1"
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case $argument in
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-h|--help)
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printf "%s\n" \
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"Usage: qr-backup.sh [options]" \
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"" \
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"Options:" \
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" --bip39 test secret against BIP39 word list" \
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" -h, --help display help for command"
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exit 0
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;;
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--bip39)
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bip39=true
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shift
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;;
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*)
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positional+=("$1")
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shift
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;;
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esac
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done
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set -- "${positional[@]}"
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bold=$(tput bold)
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red=$(tput setaf 1)
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normal=$(tput sgr0)
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basedir=$(dirname "$0")
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dev="/dev/sda1"
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tmp="/tmp/pi"
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usb="/tmp/usb"
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tput reset
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waitForUsbThumbDrive () {
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if [ ! -e $dev ]; then
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printf "Insert USB flash drive and press enter"
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read -r confirmation
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waitForUsbThumbDrive
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fi
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}
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waitForUsbThumbDrive
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printf "%s\n" "Format USB flash drive? (y or n)? "
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read -r answer
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if [ "$answer" = "y" ]; then
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if mount | grep $usb > /dev/null; then
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sudo umount $dev
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fi
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sudo mkfs -t vfat $dev
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fi
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sudo mkdir -p $usb
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if ! mount | grep $usb > /dev/null; then
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sudo mount $dev $usb -o uid=pi,gid=pi
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fi
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if [ -z "$secret" ]; then
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tput sc
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printf "%s\n" "Type secret and press enter"
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read -r secret
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tput rc
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tput ed
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printf "%s\n" "Type secret and press enter (again)"
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read -r secret_confirmation
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if [ ! "$secret" = "$secret_confirmation" ]; then
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printf "$red%s$normal\n" "Secrets do not match"
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exit 1
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fi
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fi
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function exists {
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bip39_words=($(cat "$basedir/bip39.txt"))
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for bip39_word in ${bip39_words[@]}; do
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if [ "$bip39_word" = "$1" ]; then
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return 0
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fi
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done
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return 1
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}
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if [ "$bip39" = true ]; then
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printf "%s\n" "Testing secret against BIP39 word list…"
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words=($secret)
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for word in ${words[@]}; do
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if ! exists $word; then
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printf "$red%s $bold%s$normal\n" "Invalid word" "$word"
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exit 1
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fi
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done
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fi
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encrypted_secret=$(echo -n "$secret" | gpg --s2k-mode 3 --s2k-count 65011712 --s2k-digest-algo sha512 --cipher-algo AES256 --symmetric --armor)
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gpg-connect-agent reloadagent /bye > /dev/null 2>&1
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encrypted_secret_hash=$(echo -n "$encrypted_secret" | openssl dgst -sha512 | sed 's/^.* //')
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encrypted_secret_short_hash=$(echo -n "$encrypted_secret_hash" | head -c 8)
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printf "%s\n" "$encrypted_secret"
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printf "%s: $bold%s$normal\n" "SHA512 hash" "$encrypted_secret_hash"
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printf "%s: $bold%s$normal\n" "SHA512 short hash" "$encrypted_secret_short_hash"
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echo -n "$encrypted_secret" | qr --error-correction=H > "$tmp/secret.png"
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font_size=$(echo "$(convert "$tmp/secret.png" -format "%h" info:) / 8" | bc)
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text_offset=$(echo "$font_size * 1.5" | bc)
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convert "$tmp/secret.png" -gravity center -scale 200% -extent 125% -scale 125% -gravity south -font /usr/share/fonts/truetype/noto/NotoMono-Regular.ttf -pointsize $font_size -fill black -draw "text 0,$text_offset '$encrypted_secret_short_hash'" "$usb/$encrypted_secret_short_hash.jpg"
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printf "%s\n" "Show SHA512 hash as QR code? (y or n)? "
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read -r answer
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if [ "$answer" = "y" ]; then
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printf "%s\n" "Press q to quit"
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sleep 1
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echo -n "$encrypted_secret_hash" | qr --error-correction=L > "$tmp/secret-hash.png"
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sudo fim --autozoom --quiet --vt 1 "$tmp/secret-hash.png"
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fi
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sudo umount $usb
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printf "%s\n" "Done"
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