MySQL AES Encryption in Ruby

I was asked to find a way to encrypt strings in Ruby that would be compatible with MySQL's AES_ENCRYPT and AES_DECRYPT functions. I found several solutions online, but none of them worked the way I expected. After cobbling together several examples, I finally came up with a solution that proved to be compatible with the MySQL version. This was written for use with Ruby 2.3.5. This module can be used as follows: