class ActiveSupport::MessageEncryptor

def encrypt(data)
  cipher = new_cipher
  cipher.encrypt
  cipher.key = @secret
  # Rely on OpenSSL for the initialization vector
  iv = cipher.random_iv
  cipher.auth_data = "" if aead_mode?
  encrypted_data = cipher.update(data)
  encrypted_data << cipher.final
  parts = [encrypted_data, iv]
  parts << cipher.auth_tag(AUTH_TAG_LENGTH) if aead_mode?
  join_parts(parts)
end