An example of aes encryption in ruby for CoreSpring

ruby_encryption.rb

require 'openssl'

###
# An implementation of the AES encryption spec
# see: http://www.corespring.org/developer/home#encrypting-player-options
###
class EncryptionHelper

  Type = "AES-128-CBC"
  
  def self.encrypt(data, client_secret)
    aes = OpenSSL::Cipher::Cipher.new(Type)
    iv = aes.random_iv
    iv_hexed = iv.unpack('H*')[0]
    key = self.digest_key(client_secret)
    aes.encrypt
    aes.key = key
    aes.iv = iv

    cipher = aes.update(data)
    cipher << aes.final

    encrypted_hexed = cipher.unpack('H*')[0]
    "#{encrypted_hexed}--#{iv_hexed}"
  end

  private 

  def self.digest_key(raw_key)
    digest = Digest::MD5.new
    digest.update(raw_key)
    key = digest.digest
    key
  end
end