Google Authenticator PHP class

This PHP class can be used to interact with the Google Authenticator mobile app for 2-factor-authentication. This class can generate secrets, generate codes, validate codes and present a QR-Code for scanning the secret.

For a secure installation you have to make sure that used codes cannot be reused (replay-attack).

Usage:

See example files

php example1.php
Secret is: OQB6ZZGYHCPSX4AK

Google Charts URL for the QR-Code: https://www.google.com/chart?chs=200x200&chld=M|0&cht=qr&chl=otpauth://totp/infoATphpgangsta.de%3Fsecret%3DOQB6ZZGYHCPSX4AK

Checking Code '848634' and Secret 'OQB6ZZGYHCPSX4AK':
OK

Author

Renan Galeno

• https://renan.eng.br/

Michael Kliewe

• http://www.phpgangsta.de
• http://twitter.com/PHPGangsta

License

Licensed under the BSD License.