QR Code Encoder
Reference used was ISO/IEC 18004, 1st Edition (2000)
This implementation is informed by my specific needs, i.e. to provide two-factor authentication for mobile phones running Google Authenticator.
- "Byte" mode only (don't need e.g. numeric mode or kanji mode).
- Encode only (no detection/decode).
- Basic supporting library functions provided (HOTP, PNG image functions) to allow full-cyle demo.
- Download repo and compile with
- Install Google Authenticator App on your mobile:
- Run demo:
- Open the generated
- Scan the qrcode into the phone.
- Ensure server clock is correct.
- The value of
qrcode_demo:totp()should show the same passcode as the phone.
- Handle PINs/logins for the second part of the "two factor" according to your application design.
NOTE: This documentation is rather basic as this was open-sourced by specific request!