Cyption using PHP 7.1

Good day! I have a concern about the encryption method in PHP 7.1. We just migrated our code from PHP 5.6 to 7.1 and when we were using 5.6, we used the mcrypt function in encryption and decryption of password. And now that our codes are in version 7.1, the mcrypt is already deprecated and an error is displayed about the function mcrpyt. I have search other functions in 7.1 in encryption and found the openSSL function but the passwords that were crypted by mcrypt cannot anymore be crypted using openSSL. Is there a possible way to encrypt and decrypt passwords that were crypted by mcrypt in php 7.1? Your urgent response will be much appreciated.