# File lib/omniauth/strategies/windows_live/windowslivelogin.rb, line 184
  def oldsecret=(secret)
    return if (secret.nil? or secret.empty?)
    if (secret.size < 16)
      fatal("Error: oldsecret=: Secret must be at least 16 characters.")       
    end
    @oldsignkey = derive(secret, "SIGNATURE")
    @oldcryptkey = derive(secret, "ENCRYPTION")
  end