NAME

Trog::TOTP - Fork of Authen::TOTP

VERSION

version 1.002

DESCRIPTION

Trog::TOTP is a fork of Authen::TOTP.

While patches were initially merged upstream, no CPAN releases happened, so here we are.

NAME

Trog::TOTP - Interface to RFC6238 two factor authentication (2FA)

USAGE

 my $gen = Authen::TOTP->new(
     # not needed when setting up TOTP for the first time;
     # we generate a secret automatically which you should grab and store.
	 secret		=>	"some_random_stuff",
     # ACHTUNG! lots of TOTP apps on various devices ignore this field
     # and hardcode 30s periods.  Probably best to never touch this.
     period     => 30,
     # callback used when emitting messages;
     # use me for integrating into your own logging framework
     logger     => sub { my $msg = shift; ... },
 );

 # Be sure to store this as binary data
 my $secret = $get->secret();

 # This is what you will want to show users for input into their TOTP apps when their camera is failing
 my $b32secret = $gen->base32secret();

 # will generate a TOTP URI, suitable to use in a QR Code
 my $uri = $gen->generate_otp(user => 'user\@example.com', issuer => "example.com");

 # use Imager::QRCode to plot the secret for the user
 use Imager::QRCode;
 my $qrcode = Imager::QRCode->new(
       size          => 4,
       margin        => 3,
       level         => 'L',
       casesensitive => 1,
       lightcolor    => Imager::Color->new(255, 255, 255),
       darkcolor     => Imager::Color->new(0, 0, 0),
 );

 my $img = $qrcode->plot($uri);
 $img->write(file => "totp.png", type => "png");

 # compare user's OTP with computed one
 if ($gen->validate_otp(otp => <user_input>, secret => <stored_secret>, tolerance => 1)) {
	#2FA success
 }
 else {
	#no match
 }

  # Just print out the dang code
  print $gen->expected_totp_code(time);

CONSTRUCTOR

new

 my $gen = Authen::TOTP->new(
	 digits 	=>	[6|8],
	 period		=>	[30|60],
	 algorithm	=>	"SHA1", #SHA256 and SHA512 are equally valid
	 secret		=>	"some_random_stuff",
	 when		=>	<some_epoch>,
	 tolerance	=>	0,
     logger     => sub { my $msg=shift; ... },
 );

Parameters/Properties (defaults listed)

digits: 6=> How many digits to produce/compare
period: 30=> OTP is valid for this many seconds
algorithm: SHA1=> supported values are SHA1, SHA256 and SHA512, although most clients only support SHA1 AFAIK
secret: random_20byte_string=> Secret used as seed for the OTP
base32secret: base32_encoded_random_12byte_string=> Alternative way to set secret (base32 encoded)
when: epoch=> Time used for comparison of OTPs
tolerance: 1=> Due to time sync issues, you may want to tune this and compare this many OTPs before and after
logger: Log callback subroutine. Use to integrate various messages from this modules into your logging framework.
DEBUG: Turn on extended log messaging.

METHODS

secret

Return the current secret used by this object.

base32secret

Return the base32encoded secret used by this object.

algorithm([STRING $algo])

Returns, and optionally sets the algorithm if passed.

expected_totp_code( TIME_T $when )

Returns what a code "ought" to be at any given unix timestamp. Useful for integrating into command line tooling to fix things when people have "tecmological differences" with their telephone.

generate_otp

Create a TOTP URI using the parameters specified or the defaults from the new() method above

Usage:

 $gen->generate_otp(
	 digits 	=>	[6|8],
	 period		=>	[30|60],
	 algorithm	=>	"SHA1", #SHA256 and SHA512 are equally valid
	 secret		=>	"some_random_stuff",
	 issuer		=>	"example.com",
	 user		=>	"some_identifier",
 );

 Google Authenticator displays <issuer> (<user>) for a TOTP generated like this

validate_otp

Compare a user-supplied TOTP using the parameters specified. Obviously the secret MUST be the same secret you used in generate_otp() above/ Returns 1 on success, undef if OTP doesn't match

Usage:

 $gen->validate_otp(
	 digits 	=>	[6|8],
	 period		=>	[30|60],
	 algorithm	=>	"SHA1", #SHA256 and SHA512 are equally valid
	 secret		=>	"the_same_random_stuff_you_used_to_generate_the_TOTP",
	 when		=>	<epoch_to_use_as_reference>,
	 tolerance	=>	<try this many iterations before/after when>
	 otp		=>	<OTP to compare to>
 );

BUGS

Please report any bugs or feature requests on the bugtracker website https://github.com/teodesian/Trog-TOTP/issues

When submitting a bug or request, please include a test-file or a patch to an existing test-file that illustrates the bug or desired feature.

AUTHORS

Current Maintainers:

George S. Baugh <teodesian@gmail.com>

CONTRIBUTOR

Thanos Chatziathanassiou <tchatzi@arx.net>

COPYRIGHT AND LICENSE

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To install Trog::TOTP, copy and paste the appropriate command in to your terminal.

cpanm

cpanm Trog::TOTP

CPAN shell

perl -MCPAN -e shell
install Trog::TOTP

For more information on module installation, please visit the detailed CPAN module installation guide.

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NAME

VERSION

DESCRIPTION

NAME

USAGE

CONSTRUCTOR

new

Parameters/Properties (defaults listed)

METHODS

secret

base32secret

algorithm([STRING $algo])

expected_totp_code( TIME_T $when )

generate_otp

validate_otp

BUGS

AUTHORS

CONTRIBUTOR

COPYRIGHT AND LICENSE

Module Install Instructions