You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
Michael Iseli bf96148461 Add python virtual env instructions 2 weeks ago
generated_python fix example in readme, generate with protoc 3.14 12 months ago
.editorconfig Initial 2 years ago
.gitignore Add python virtual env instructions 2 weeks ago
README.md Add python virtual env instructions 2 weeks ago
example_export.txt fix: improve logging, handle file saving without issuer, extend example 11 months ago
extract_otp_secret_keys.py Use print_ascii to make it work in powershell 3 weeks ago
google_auth.proto Initial 2 years ago
requirements-buildenv.txt Add python virtual env instructions 2 weeks ago
requirements.txt Add python virtual env instructions 2 weeks ago

README.md

Extract TOTP/HOTP secret keys from Google Authenticator

Extract two-factor authentication (2FA, TFA) secret keys from export QR codes of "Google Authenticator" app

Usage

  1. Export the QR codes from "Google Authenticator" app

  2. Read QR codes with QR code reader

  3. Save the captured QR codes in a text file. Save each QR code on a new line. (The captured QR codes look like otpauth-migration://offline?data=...)

  4. Call this script with the file as input:

     python extract_otp_secret_keys.py -p example_export.txt
    

Requirement

The protobuf package of Google for proto3 is required for running this script. protobuf >= 3.14 is recommended.

pip install protobuf

Known to work with

  • Python 3.6.12 and protobuf 3.14.0
  • Python 3.8.5 and protobuf 3.14.0

Optional

For printing QR codes, the qrcode module is required

pip install qrcode[pil]

Alternative installation method

Alternatively, you can use a python virtual env for the dependencies:

python -m venv venv
. venv/bin/activate
pip install -r requirements-buildenv.txt
pip install -r requirements.txt

The requirements*.txt files contain all the dependencies (also the optional ones). To leave the python virtual env just call deactivate.

Technical background

The export QR code of "Google Authenticator" contains the URL otpauth-migration://offline?data=.... The data parameter is a base64 encoded proto3 message (Google Protocol Buffers).

Command for regeneration of Python code from proto3 message definition file (only necessary in case of changes of the proto3 message definition):

protoc --python_out=generated_python google_auth.proto

References