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39 lines
1.3 KiB
Markdown
39 lines
1.3 KiB
Markdown
# Extract TOTP/HOTP secret keys from Google Authenticator
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Extract two-factor authentication (2FA, TFA) secret keys from export QR codes of "Google Authenticator" app
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## Usage
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1. Export the QR codes from "Google Authenticator" app
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2. Read QR codes with QR code reader
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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=...`)
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4. Call this script with the file as input:
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python extract_otp_secret_keys.py -p example_export.txt
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## Requirement
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The protobuf package of Google for proto3 is required for running this script.
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pip install protobuf
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### Optional
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For printing QR codes, the qrcode module is required
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pip install qrcode[pil]
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## Technical background
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The export QR code of "Google Authenticator" contains the URL `otpauth-migration://offline?data=...`.
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The data parameter is a base64 encoded proto3 message (Google Protocol Buffers).
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Command for regeneration of Python code from proto3 message definition file (only necessary in case of changes of the proto3 message definition):
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protoc --python_out=generated_python google_auth.proto
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## References
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* Proto3 documentation: https://developers.google.com/protocol-buffers/docs/pythontutorial
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* Template code: https://github.com/beemdevelopment/Aegis/pull/406
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