encryption.rb

require 'openssl'

module Encryption
  def encrypt(data, password, salt)
    cipher = OpenSSL::Cipher::Cipher.new('aes-256-cbc')
    cipher.encrypt
    cipher.pkcs5_keyivgen(password, salt)
    encrypted_data = cipher.update(data)
    encrypted_data << cipher.final
  end

  def decrypt(encrypted_data, password, salt)
    cipher = OpenSSL::Cipher::Cipher.new('aes-256-cbc')
    cipher.decrypt
    cipher.pkcs5_keyivgen(password, salt)
    data = cipher.update(encrypted_data)
    data << cipher.final
  end
end

# Note: you will need to generate the salt and use the same salt and password for both encryption 
# and decryption
# 
# sample salt generator below
#
# def generate_salt
#   [rand(2**64 - 1)].pack("Q")
# end