Warning

This code is not recommended for use in production! It was not written to be efficient or safe, only readable and descriptive for didatic purposes.

References (AES)

http://www.movable-type.co.uk/scripts/aes.html
https://github.com/brix/crypto-js/blob/develop/src/aes.js
https://github.com/kokke/tiny-AES128-C/blob/master/aes.c
https://github.com/chrishulbert/crypto/blob/master/ruby/ruby_aes.rb
Cryptography and Network Security: Principles and Practice (https://g.co/kgs/UUEmv7)