komone 3939fb66e7 Commit of qrcode encoder and supporting modules.

Includes demo module with basic png and crypto
for a full-cyle demo with a mobile phone.

2011-04-10 23:08:14 -05:00

git remote add origin git@github.com:komone/qrcode.git git push -u origin master

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.

Demo

Download repo and compile with erl -make
Install Google Authenticator App on your mobile:
- iPhone: http://itunes.apple.com/us/app/google-authenticator/id388497605?mt=8
- Android: https://market.android.com/details?id=com.google.android.apps.authenticator
Run demo: qrcode_demo:run().
Open the generated qrcode.png file
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.

NOTE: This documentation is rather basic as this was open-sourced by specific request!