This repository contains a highly configurable AES-GCM IP, using keys at 128, 192 or 256 bits. URL to the project: https://github.com/BLu85/AES-GCM-128-192-256-bits
The url of the svn repository is: https://opencores.org/websvn/listing/aes_gcm_128_192_256/aes_gcm_128_192_256