Magento 2 & Php 7.1 Fix: Function mcyrpt_module_open() is deprecated

The file  is root/vendor/magento/framework/Encryption/Crypt.php

You need to go through the file and add the `@ `sign before any of the mcrypt calls.

Like

$this->_handle = mcrypt_module_open($cipher, '', $mode, '');

To

$this->_handle = @mcrypt_module_open($cipher, '', $mode, '');

Download the modified version of the file here.

credit Cadence Labs

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