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#gem install fast-aes

require 'rubygems'
require 'fast-aes'

  # key can be 128, 192, or 256 bits
  key = '42#3b%c$dxyT,7a5=+5fUI3fa7352&^:'

  aes = FastAES.new(key)

  text = "Hey there, how are you?"

  data = aes.encrypt(text)

  puts aes.decrypt(data)   # "Hey there, how are you?"
  
#  这个库是用c写的,所以速度很快.
#  https://github.com/nateware/fast-aes