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Implemented Electrum mnemonic feature

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Sun Knudsen 2021-04-09 13:57:09 -04:00
parent 3ca2601faa
commit 81246f8000
No known key found for this signature in database
GPG Key ID: 1FA767862BBD1305
12 changed files with 210 additions and 123 deletions
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111
how-to-create-encrypted-paper-backup/README.md
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@ -94,9 +94,72 @@ $ echo -e "export GPG_TTY=\"\$(tty)\"\nexport PATH=\$PATH:/home/pi/.local/bin" >
$ source ~/.bashrc $ source ~/.bashrc
``` ```
### Step 5 (optional): install `screen` and [Trezor](https://trezor.io/)’s [trezorcrl](https://wiki.trezor.io/Using_trezorctl_commands_with_Trezor) ### Step 5 (optional): install [Electrum](https://electrum.org/#home) (required to generate Electrum mnemonic)
> Heads-up: we will likely use `screen` and `trezorcrl` command line utilities in the future and this guide is designed to configure a [read-only](#step-12-make-filesystem-read-only) Raspberry Pi. #### Install Electrum dependencies
```shell
apt install -y libsecp256k1-0 python3-cryptography
```
#### Set Electrum release semver environment variable
> Heads-up: replace `4.1.2` with [latest release](https://electrum.org/#download).
```shell
ELECTRUM_RELEASE_SEMVER=4.1.2
```
#### Download Electrum release and PGP signature
```shell
curl -O "https://download.electrum.org/$ELECTRUM_RELEASE_SEMVER/Electrum-$ELECTRUM_RELEASE_SEMVER.tar.gz"
curl -O "https://download.electrum.org/$ELECTRUM_RELEASE_SEMVER/Electrum-$ELECTRUM_RELEASE_SEMVER.tar.gz.asc"
```
#### Import ThomasV’s PGP public key
```console
$ curl https://raw.githubusercontent.com/spesmilo/electrum/master/pubkeys/ThomasV.asc | gpg --import
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 4739 100 4739 0 0 22459 0 --:--:-- --:--:-- --:--:-- 22459
gpg: /home/pi/.gnupg/trustdb.gpg: trustdb created
gpg: key 2BD5824B7F9470E6: public key "Thomas Voegtlin (https://electrum.org) <thomasv@electrum.org>" imported
gpg: Total number processed: 1
gpg: imported: 1
```
imported: 1
👍
#### Verify Electrum release using GnuPG (learn how [here](../how-to-verify-pgp-digital-signatures-using-gnupg-on-macos))
```console
$ gpg --verify Electrum-$ELECTRUM_RELEASE_SEMVER.tar.gz.asc
gpg: assuming signed data in 'Electrum-$ELECTRUM_RELEASE_SEMVER.tar.gz'
gpg: Signature made Thu 08 Apr 2021 09:47:30 EDT
gpg: using RSA key 6694D8DE7BE8EE5631BED9502BD5824B7F9470E6
gpg: Good signature from "Thomas Voegtlin (https://electrum.org) <thomasv@electrum.org>" [unknown]
gpg: aka "ThomasV <thomasv1@gmx.de>" [unknown]
gpg: aka "Thomas Voegtlin <thomasv1@gmx.de>" [unknown]
gpg: WARNING: This key is not certified with a trusted signature!
gpg: There is no indication that the signature belongs to the owner.
Primary key fingerprint: 6694 D8DE 7BE8 EE56 31BE D950 2BD5 824B 7F94 70E6
```
Good signature
👍
#### Install Electrum
```shell
pip3 install --user Electrum-$ELECTRUM_RELEASE_SEMVER.tar.gz
```
### Step 6 (optional): install `screen` and [trezorcrl](https://wiki.trezor.io/Using_trezorctl_commands_with_Trezor) (required to validate integrity of [Trezor](https://trezor.io/) encrypted paper backups)
```console ```console
$ sudo apt install -y screen $ sudo apt install -y screen
@ -106,47 +169,47 @@ $ pip3 install attrs trezor --user
$ sudo curl https://data.trezor.io/udev/51-trezor.rules -o /etc/udev/rules.d/51-trezor.rules $ sudo curl https://data.trezor.io/udev/51-trezor.rules -o /etc/udev/rules.d/51-trezor.rules
``` ```
### Step 6: download [create-seed.py](./create-seed.py) ([PGP signature](./create-seed.py.sig), [PGP public key](https://sunknudsen.com/sunknudsen.asc)) ### Step 7: download [create-bip39-mnemonic.py](./create-bip39-mnemonic.py) ([PGP signature](./create-bip39-mnemonic.py.sig), [PGP public key](https://sunknudsen.com/sunknudsen.asc))
```shell ```shell
sudo curl -o /usr/local/sbin/create-seed.py https://sunknudsen.com/static/media/privacy-guides/how-to-create-encrypted-paper-backup/create-seed.py sudo curl -o /usr/local/sbin/create-bip39-mnemonic.py https://sunknudsen.com/static/media/privacy-guides/how-to-create-encrypted-paper-backup/create-bip39-mnemonic.py
``` ```
### Step 7: download [validate-seed.py](./validate-seed.py) ([PGP signature](./validate-seed.py.sig), [PGP public key](https://sunknudsen.com/sunknudsen.asc)) ### Step 8: download [validate-bip39-mnemonic.py](./validate-bip39-mnemonic.py) ([PGP signature](./validate-bip39-mnemonic.py.sig), [PGP public key](https://sunknudsen.com/sunknudsen.asc))
```shell ```shell
sudo curl -o /usr/local/sbin/validate-seed.py https://sunknudsen.com/static/media/privacy-guides/how-to-create-encrypted-paper-backup/validate-seed.py sudo curl -o /usr/local/sbin/validate-bip39-mnemonic.py https://sunknudsen.com/static/media/privacy-guides/how-to-create-encrypted-paper-backup/validate-bip39-mnemonic.py
``` ```
### Step 8: download [qr-backup.sh](./qr-backup.sh) ([PGP signature](./qr-backup.sh.sig), [PGP public key](https://sunknudsen.com/sunknudsen.asc)) ### Step 9: download [qr-backup.sh](./qr-backup.sh) ([PGP signature](./qr-backup.sh.sig), [PGP public key](https://sunknudsen.com/sunknudsen.asc))
```shell ```shell
sudo curl -o /usr/local/sbin/qr-backup.sh https://sunknudsen.com/static/media/privacy-guides/how-to-create-encrypted-paper-backup/qr-backup.sh sudo curl -o /usr/local/sbin/qr-backup.sh https://sunknudsen.com/static/media/privacy-guides/how-to-create-encrypted-paper-backup/qr-backup.sh
sudo chmod +x /usr/local/sbin/qr-backup.sh sudo chmod +x /usr/local/sbin/qr-backup.sh
``` ```
### Step 9: download [qr-restore.sh](./qr-restore.sh) ([PGP signature](./qr-restore.sh.sig), [PGP public key](https://sunknudsen.com/sunknudsen.asc)) ### Step 10: download [qr-restore.sh](./qr-restore.sh) ([PGP signature](./qr-restore.sh.sig), [PGP public key](https://sunknudsen.com/sunknudsen.asc))
```shell ```shell
sudo curl -o /usr/local/sbin/qr-restore.sh https://sunknudsen.com/static/media/privacy-guides/how-to-create-encrypted-paper-backup/qr-restore.sh sudo curl -o /usr/local/sbin/qr-restore.sh https://sunknudsen.com/static/media/privacy-guides/how-to-create-encrypted-paper-backup/qr-restore.sh
sudo chmod +x /usr/local/sbin/qr-restore.sh sudo chmod +x /usr/local/sbin/qr-restore.sh
``` ```
### Step 10: download [qr-clone.sh](./qr-clone.sh) ([PGP signature](./qr-clone.sh.sig), [PGP public key](https://sunknudsen.com/sunknudsen.asc)) ### Step 11: download [qr-clone.sh](./qr-clone.sh) ([PGP signature](./qr-clone.sh.sig), [PGP public key](https://sunknudsen.com/sunknudsen.asc))
```shell ```shell
sudo curl -o /usr/local/sbin/qr-clone.sh https://sunknudsen.com/static/media/privacy-guides/how-to-create-encrypted-paper-backup/qr-clone.sh sudo curl -o /usr/local/sbin/qr-clone.sh https://sunknudsen.com/static/media/privacy-guides/how-to-create-encrypted-paper-backup/qr-clone.sh
sudo chmod +x /usr/local/sbin/qr-clone.sh sudo chmod +x /usr/local/sbin/qr-clone.sh
``` ```
### Step 11: download [secure-erase.sh](./secure-erase.sh) ([PGP signature](./secure-erase.sh.sig), [PGP public key](https://sunknudsen.com/sunknudsen.asc)) ### Step 12: download [secure-erase.sh](./secure-erase.sh) ([PGP signature](./secure-erase.sh.sig), [PGP public key](https://sunknudsen.com/sunknudsen.asc))
```shell ```shell
sudo curl -o /usr/local/sbin/secure-erase.sh https://sunknudsen.com/static/media/privacy-guides/how-to-create-encrypted-paper-backup/secure-erase.sh sudo curl -o /usr/local/sbin/secure-erase.sh https://sunknudsen.com/static/media/privacy-guides/how-to-create-encrypted-paper-backup/secure-erase.sh
sudo chmod +x /usr/local/sbin/secure-erase.sh sudo chmod +x /usr/local/sbin/secure-erase.sh
``` ```
### Step 12: make filesystem read-only ### Step 13: make filesystem read-only
> Heads-up: shout-out to Nico Kaiser for his amazing [guide](https://gist.github.com/nicokaiser/08aa5b7b3958f171cf61549b70e8a34b) on how to configure a read-only Raspberry Pi. > Heads-up: shout-out to Nico Kaiser for his amazing [guide](https://gist.github.com/nicokaiser/08aa5b7b3958f171cf61549b70e8a34b) on how to configure a read-only Raspberry Pi.
@ -210,13 +273,13 @@ sudo sed -i -e 's/vfat\s*defaults\s/vfat defaults,ro/' /etc/fstab
sudo sed -i -e 's/ext4\s*defaults,noatime\s/ext4 defaults,noatime,ro,noload/' /etc/fstab sudo sed -i -e 's/ext4\s*defaults,noatime\s/ext4 defaults,noatime,ro,noload/' /etc/fstab
``` ```
### Step 13: disable Wi-Fi (if not using ethernet) ### Step 14: disable Wi-Fi (if not using ethernet)
```shell ```shell
echo "dtoverlay=disable-wifi" | sudo tee -a /boot/config.txt echo "dtoverlay=disable-wifi" | sudo tee -a /boot/config.txt
``` ```
### Step 14: disable `dhcpcd`, `networking` and `wpa_supplicant` services and “fix” `rfkill` bug ### Step 15: disable `dhcpcd`, `networking` and `wpa_supplicant` services and “fix” `rfkill` bug
```console ```console
$ sudo systemctl disable dhcpcd networking wpa_supplicant $ sudo systemctl disable dhcpcd networking wpa_supplicant
@ -224,13 +287,13 @@ $ sudo systemctl disable dhcpcd networking wpa_supplicant
$ sudo rm /etc/profile.d/wifi-check.sh $ sudo rm /etc/profile.d/wifi-check.sh
``` ```
### Step 15: delete macOS hidden files (if present) ### Step 16: delete macOS hidden files (if present)
```shell ```shell
sudo rm -fr /boot/.fseventsd /boot/.DS_Store /boot/.Spotlight-V100 sudo rm -fr /boot/.fseventsd /boot/.DS_Store /boot/.Spotlight-V100
``` ```
### Step 16: reboot ### Step 17: reboot
```shell ```shell
sudo systemctl reboot sudo systemctl reboot
@ -238,9 +301,9 @@ sudo systemctl reboot
> WARNING: DO NOT CONNECT RASPBERRY PI TO NETWORK EVER AGAIN WITHOUT REINSTALLING RASPBERRY PI OS FIRST (DEVICE IS NOW "READ-ONLY" AND “COLD”). > WARNING: DO NOT CONNECT RASPBERRY PI TO NETWORK EVER AGAIN WITHOUT REINSTALLING RASPBERRY PI OS FIRST (DEVICE IS NOW "READ-ONLY" AND “COLD”).
### Step 17 (optional): disable auto-mount of `boot` volume (on macOS) ### Step 18 (optional): disable auto-mount of `boot` volume (on macOS)
> Heads-up: done to prevent macOS from writing [hidden files](#step-15-delete-macos-hidden-files-if-present) to `boot` volume which would invalidate stored SHA512 hash of micro SD card. > Heads-up: done to prevent macOS from writing [hidden files](#step-16-delete-macos-hidden-files-if-present) to `boot` volume which would invalidate stored SHA512 hash of micro SD card.
Insert micro SD card into macOS computer, run following and eject card. Insert micro SD card into macOS computer, run following and eject card.
@ -250,7 +313,7 @@ volume_uuid=$(diskutil info "$volume_path" | awk '/Volume UUID:/ { print $3 }')
echo "UUID=$volume_uuid none msdos rw,noauto" | sudo tee -a /etc/fstab echo "UUID=$volume_uuid none msdos rw,noauto" | sudo tee -a /etc/fstab
``` ```
### Step 18 (optional): compute SHA512 hash of micro SD card and store in password manager (on macOS) ### Step 19 (optional): compute SHA512 hash of micro SD card and store in password manager (on macOS)
Run `diskutil list` to find disk ID of micro SD card with “Raspberry Pi OS Lite” installed (`disk2` in the following example). Run `diskutil list` to find disk ID of micro SD card with “Raspberry Pi OS Lite” installed (`disk2` in the following example).
@ -293,16 +356,16 @@ SHA512(/dev/rdisk2)= 353af7e9bd78d7d98875f0e2a58da3d7cdfc494f2ab5474b2ab4a8fd212
### Create encrypted paper backup ### Create encrypted paper backup
> Heads-up: use `--bip39` to test secret against BIP39 [word list](https://raw.githubusercontent.com/bitcoin/bips/master/bip-0039/english.txt).
```console ```console
$ qr-backup.sh --help $ qr-backup.sh --help
Usage: qr-backup.sh [options] Usage: qr-backup.sh [options]
Options: Options:
--create-seed create 24-word BIP39 seed --create-bip39-mnemonic create BIP39 mnemonic
--validate-seed validate if secret is BIP39 seed --create-electrum-mnemonic create Electrum mnemonic
-h, --help display help for command --validate-bip39-mnemonic validate if secret is valid BIP39 mnemonic
--label <label> print label after short hash
-h, --help display help for command
$ qr-backup.sh $ qr-backup.sh
Format USB flash drive? (y or n)? Format USB flash drive? (y or n)?
@ -336,7 +399,7 @@ The following image is now available on USB flash drive.
> Heads-up: use `--word-list` to split secret into word list. > Heads-up: use `--word-list` to split secret into word list.
```console ```console
$ qr-restore.sh $ qr-restore.sh --help
Usage: qr-restore.sh [options] Usage: qr-restore.sh [options]
Options: Options:

0
how-to-create-encrypted-paper-backup/create-seed.py → how-to-create-encrypted-paper-backup/create-bip39-mnemonic.py
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16
how-to-create-encrypted-paper-backup/create-bip39-mnemonic.py.sig Normal file
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@ -0,0 +1,16 @@
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16
how-to-create-encrypted-paper-backup/create-seed.py.sig
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54
how-to-create-encrypted-paper-backup/qr-backup.sh
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@ -11,17 +11,28 @@ while [[ $# -gt 0 ]]; do
"Usage: qr-backup.sh [options]" \ "Usage: qr-backup.sh [options]" \
"" \ "" \
"Options:" \ "Options:" \
" --create-seed create 24-word BIP39 seed" \ " --create-bip39-mnemonic create BIP39 mnemonic" \
" --validate-seed validate if secret is BIP39 seed" \ " --create-electrum-mnemonic create Electrum mnemonic" \
" -h, --help display help for command" " --validate-bip39-mnemonic validate if secret is valid BIP39 mnemonic" \
" --label <label> print label after short hash" \
" -h, --help display help for command"
exit 0 exit 0
;; ;;
--create-seed) --create-bip39-mnemonic)
create_seed=true create_bip39_mnemonic=true
shift shift
;; ;;
--validate-seed) --create-electrum-mnemonic)
validate_seed=true create_electrum_mnemonic=true
shift
;;
--validate-bip39-mnemonic)
validate_bip39_mnemonic=true
shift
;;
--label)
label=$2
shift
shift shift
;; ;;
*) *)
@ -70,9 +81,16 @@ if ! mount | grep $usb > /dev/null; then
sudo mount $dev $usb -o uid=pi,gid=pi sudo mount $dev $usb -o uid=pi,gid=pi
fi fi
if [ "$create_seed" = true ]; then if [ "$create_bip39_mnemonic" = true ]; then
printf "%s\n" "Creating 24-word BIP39 seed…" printf "%s\n" "Creating BIP39 mnemonic…"
secret=$(python3 $basedir/create-seed.py) secret=$(python3 $basedir/create-bip39-mnemonic.py)
echo $secret
sleep 1
fi
if [ "$create_electrum_mnemonic" = true ]; then
printf "%s\n" "Creating Electrum mnemonic…"
secret=$(electrum make_seed --nbits 264 --offline)
echo $secret echo $secret
sleep 1 sleep 1
fi fi
@ -91,10 +109,10 @@ if [ -z "$secret" ]; then
fi fi
fi fi
if [ "$validate_seed" = true ]; then if [ "$validate_bip39_mnemonic" = true ]; then
printf "%s\n" "Validate if secret is BIP39 seed…" printf "%s\n" "Validating if secret is valid BIP39 mnemonic…"
if ! echo -n $secret | python3 $basedir/validate-seed.py; then if ! echo -n $secret | python3 $basedir/validate-bip39-mnemonic.py; then
printf "$red%s$normal\n" "Invalid BIP39 seed" printf "$red%s$normal\n" "Invalid BIP39 mnemonic"
exit 1 exit 1
fi fi
fi fi
@ -114,7 +132,13 @@ echo -n "$encrypted_secret" | qr --error-correction=H > "$tmp/secret.png"
font_size=$(echo "$(convert "$tmp/secret.png" -format "%h" info:) / 8" | bc) font_size=$(echo "$(convert "$tmp/secret.png" -format "%h" info:) / 8" | bc)
text_offset=$(echo "$font_size * 1.5" | bc) text_offset=$(echo "$font_size * 1.5" | bc)
convert "$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/$encrypted_secret_short_hash.jpg" if [ -z "$label" ]; then
text="$encrypted_secret_short_hash"
else
text="$encrypted_secret_short_hash $label"
fi
convert "$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 '$text'" "$usb/$encrypted_secret_short_hash.jpg"
printf "%s\n" "Show SHA512 hash as QR code? (y or n)? " printf "%s\n" "Show SHA512 hash as QR code? (y or n)? "

26
how-to-create-encrypted-paper-backup/qr-backup.sh.sig
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@ -1,16 +1,16 @@
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