Yet another package available in centos-sclo-sclo-testing The -mcrypt package contains a dynamic shared object that will add support for using the mcrypt library to PHP. For rh-php56 * sclo-php56-php-mcrypt-5.6.28-1 For rh-php70 * sclo-php70-php-mcrypt-7.0.16-1 WARNING: libmcrypt is a dead project, use this extension for crytography at your own risk. This extension is still used by lot of projects, like ZendFramework, despite most recent versions have switch to something maintained. You can also read: https://blog.remirepo.net/post/2015/07/07/About-libmcrypt-and-php-mcrypt Remi. P.S. https://wiki.centos.org/SpecialInterestGroup/SCLo