The same happened to me! .-/ I am trying to install MyCred in a localhost, using XAMPP, and after some hours I discovered this information:
“Avoiding mcrypt is only half of the advice. The other half: NEVER do crypto in PHP in the first place! It is a very sloppy and most likely insecure enterprise. If you think you need PHP-based crypto to do something, then be advised that this fact is an alarming signal that something about your application design is very wrong. PHP is neither the right tool nor the right environment for cryptography.”
(https://php.net/manual/en/intro.mcrypt.php)
I have a negotiation blog, and the transfer points funcionality is one of the most important to me!