AES Encryption without Mcrypt library

i have not tried this library but you could giver a go:

phpCrypt: https://github.com/gilfether/phpcrypt

Description from the github page:

phpCrypt is an encryption library written in PHP from scratch. It aims to implement all major encryption ciphers, modes, and other tools used for encryption and decryption. phpCrypt does not rely on mCrypt, other PHP extentions, or PEAR libraries