Perl

Google Authenticator Algorithm

See more Encryption Examples

Example code implementing the Google Authenticator algorithm. Chilkat2 Perl

use strict;
use warnings;
use Chilkat2;

# This example assumes the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

# Generating TOTP Base32 Secret:
# When you enable 2FA with a TOTP-based authenticator app, Google will provide you with a QR code
# that you can scan using the app. This QR code contains a TOTP base32 secret.
# You can also choose to view and copy the secret manually.

my $secretBase32 = 'JBSWY3DPEHPK3PXP';

# Do the following to calculate the 6-digit decimal Google authenticator token for a base32 secret,
# given the current system date/time.
my $crypt = Chilkat2::Crypt2->new;
my $otp = $crypt->Totp($secretBase32, 'base32', '0', '', 30, 6, -1, 'sha1');

print '6-digit decimal token = ', $otp, "\n";