Auth::Yubikey_Decrypter - Decrypting the output from the yubikey token

Version 0.07

The decryption module does only one thing - decrypt the AES encrypted OTP from the Yubikey. To this, it requires the OTP, and the AES key.

Please note - this module does not perform authentication - it is a required component to decrypt the token first before authentication can be performed.

	#!/usr/bin/perl

	use strict;
	use Auth::Yubikey_Decrypter;

	my $fulltoken   = "dteffujehknhfjbrjnlnldnhcujvddbikngjrtgh";
	my $aeskey      = "ecde18dbe76fbd0c33330f1c354871db";

	my ($publicID,$secretid_hex,$counter_dec,$timestamp_dec,$session_use_dec,$random_dec,$crc_dec,$crc_ok) =
        	Auth::Yubikey_Decrypter::yubikey_decrypt($fulltoken,$aeskey);

	print "publicID  : $publicID\n";
	print "Secret id : $secretid_hex\n";
	print "Counter   : $counter_dec\n";
	print "Timestamp : $timestamp_dec\n";
	print "Session   : $session_use_dec\n";
	print "Random    : $random_dec\n";
	print "crc       : $crc_dec\n";
	print "crc ok?   : $crc_ok\n";

Input : token aeskey

Token - received by the Yubikey aeskey - either the modhex or hex AES key for your Yubikey (contact Yubico if you don't have the AES key)

Output :

$publicID $secretid_hex $counter_dec $timestamp_dec $session_use_dec $random_dec $crc_dec $crc_ok

Input : the modhex code Output : decoded modhex code in hex

Performs a crc check on the decoded data

Perl 5, Crypt::Rijndael

Order your Yubikey from http://www.yubico.com

Please report any bugs or feature requests to bug-auth-yubikey_decrypter at rt.cpan.org, or through the web interface at http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Auth-Yubikey_Decrypter. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.

You can find documentation for this module with the perldoc command.

    perldoc Auth::Yubikey_Decrypter

You can also look for information at:

* RT: CPAN's request tracker

http://rt.cpan.org/NoAuth/Bugs.html?Dist=Auth-Yubikey_Decrypter

* AnnoCPAN: Annotated CPAN documentation

http://annocpan.org/dist/Auth-Yubikey_Decrypter

* CPAN Ratings

http://cpanratings.perl.org/d/Auth-Yubikey_Decrypter

* Search CPAN

http://search.cpan.org/dist/Auth-Yubikey_Decrypter

Phil Massyn, <phil at massyn.net>

Based a lot on PHP code by : PHP yubikey decryptor v0.1 by Alex Skov Jensen Thanks to almut from http://perlmonks.org for code guidance Thanks to Mark Foobar http://blog.maniac.nl for reporting the -32 bug on line 91 and 92.

Copyright 2008 Phil Massyn, all rights reserved.

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