NAME
    Authen::OATH - OATH One Time Passwords

VERSION
    version 2.0.0

SYNOPSIS
        use Authen::OATH;

        my $oath = Authen::OATH->new();
        my $totp = $oath->totp( 'MySecretPassword' );
        my $hotp = $oath->hotp( 'MyOtherSecretPassword' );

    Parameters may be overridden when creating the new object:

        my $oath = Authen::OATH->new( digits => 8 );

    The three parameters are "digits", "digest", and "timestep." Timestep
    only applies to the totp() function.

    While strictly speaking this is outside the specifications of HOTP and
    TOTP, you can specify digests other than SHA1. For example:

        my $oath = Authen::OATH->new(
            digits => 10,
            digest => 'Digest::MD6',
        );

    If you are using Google Authenticator, you'll want to decode your secret
    *before* passing it to the "totp" method:

        use Convert::Base32 qw( decode_base32 );

        my $oath = Authen::OATH->new;
        my $secret = 'mySecret';
        my $otp = $oath->totp(  decode_base32( $secret ) );

DESCRIPTION
    Implementation of the HOTP and TOTP One Time Password algorithms as
    defined by OATH (http://www.openauthentication.org)

    All necessary parameters are set by default, though these can be
    overridden. Both totp() and htop() have passed all of the test vectors
    defined in the RFC documents for TOTP and HOTP.

    totp() and hotp() both default to returning 6 digits and using SHA1. As
    such, both can be called by passing only the secret key and a valid OTP
    will be returned.

SUBROUTINES/METHODS
  totp
        my $otp = $oath->totp( $secret [, $manual_time ] );

    Manual time is an optional parameter. If it is not passed, the current
    time is used. This is useful for testing purposes.

  hotp
        my $opt = $oath->hotp( $secret, $counter );

    Both parameters are required.

  _process
    This is an internal routine and is never called directly.

CAVEATS
    Please see the SYNOPSIS for how interaction with Google Authenticator.

AUTHOR
    Kurt Kincaid <kurt.kincaid@gmail.com>

COPYRIGHT AND LICENSE
    This software is copyright (c) 2010 by Kurt Kincaid.

    This is free software; you can redistribute it and/or modify it under
    the same terms as the Perl 5 programming language system itself.