Authen::HOTP - An HMAC-Based One-Time Password Algorithm

  use Authen::HOTP qw(hotp);

  my $secret = "abcdefghijklmnopqrst"; # 20-byte
  my $counter = 0;
  my $digits = 6;

  my $pass = hotp($secret, $counter, $digits);

This library implements the HOTP algorithm as described in RFC 4226.

http://www.rfc-editor.org/rfc/rfc4226.txt

Iain Wade, <iwade@optusnet.com.au>

Copyright (C) 2006 by root

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.5 or, at your option, any later version of Perl 5 you may have available.