Crypt::PWSafe3::SHA256 - HMAC Helper Class
This is a small helper class used to work with SHA256 in Digest::HMAC module. This is because the Digest::HMAC module requires a module as parameter for the algorithm but Digest::SHA256 doesn't exist as a module.
This module here is just a wrapper, it doesn't return an instance of its own but an instance of Digest::SHA('SHA-256') instead.
Copyright (c) 2011-2015 by T.v.Dein <email@example.com>.
This program is free software; you can redistribute it and/or modify it under the same terms of the Artistic License 2.0, see: http://www.perlfoundation.org/artistic_license_2_0