问如何使用ruby-gpgme加密file_path？

EN

  def encrypt_sign(
    plaintext,
    recipient_pubkey,
    sender_privkey,
    binary: nil,
    password: nil
  )
    in_a_directory(binary) do
      options = pinentry_mode(password)

      GPGME::Ctx.new(options) do |ctx|
        import(sender_privkey)  
        import(recipient_pubkey)

        ctx.add_signer(*(find(sender_privkey, :secret)))
        ctx.encrypt_sign(
          find(recipient_pubkey, :public),
          data(plaintext),
          data,
          GPGME::ENCRYPT_ALWAYS_TRUST
        ).to_s
      end
    end
  end