Convert MIGS payment gateway MD5 encryption to SHA256 in magento

Hello! I am expert Magneto developer with over 10 years experience. Can you provide detailed description what to do in this project?

I'm a passionate programmer having more than 4 years of experience working with UK based MNC. - Frameworks: Yii2, CakePHP, CodeIgniter, Laravel & Core PHP - CMS : Wordpress & Magento - Database : MySQL, MsSQL - Frontend : Bootstrap, HTML, jQuery, AngularJS - 3rd party integration such as Payment gateways (PayPal, WorldPay, SagePay, Amazon, Google Wallet, CcAvenue, PayTM & many more ) . - Social Networking APIs : Google, Facebook, Linkedin, InstraGram, twitter, Youtube, Vimeo. - Page Speed Optimisation : FPC, Vanish, Redis - Version management services : Git, SVN - SEO : Google Anyltics, Google Tag Manager - More than 4 Years of experience of PHP Web development and management at MNC based out of INDIA. - Have Expertise in CorePHP, Wordpress, CakePHP, Codeigniter, Payment Gateways, SOAP, XML and Other 3rd Party APIs. - Deliver high quality Services at low cost and minimum time. - Fluent in English & comfortable Voice/Video/Text chat on Skype.