KiCAD project files for the USB Wrapper project
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README.md

USB Wrapper

This repository contains the KiCAD PCB project files for the USB wrapper project by Galvant Industries.

This project is entirely open source hardware.

Pre-assembled boards now available at http://galvant.ca/shop/usb-wrapper/

About

Have you ever wanted to charge your smartphone by using your computer, but you didn't want all of your sync software to load? Maybe you want to use a friend's computer but you don't really want Windows to start trying to install drivers and for your device to open in USB transfer mode. Or maybe the power source is simply untrusted and you want to avoid a potential attack.

Inspired by the USB Condom, the USB Wrapper helps with the above by severing the USB data lines and only allowing the power lines to connect through. This ensures that no data information can be transfered between the power source and your device. This helps against known attacks such as juice jacking: http://krebsonsecurity.com/2011/08/beware-of-juice-jacking/

This however does present a problem. In legitimate USB chargers, the data lines are used to communicate to your device how much power they are capable of sourcing. The exact means by which they do vary between manufacturers. The standard calls for the D+ and D- lines to be shorted together, while companies like Apple will apply specific voltages on both lines depending on the charger. By entirely disconnecting these data lines, your device does not know any information about the charger, and will thus assume it is a standard USB2.0 port. This limits means the device will self-limit the charging rate to 2.5W, even if the charger can in fact handle more.

To deal with this, the USB Wrapper has two slider switches allowing you to tell your device what kind of charger it is connected to. This also allows you to mix and match chargers and device manufacturers which don't follow the same signalling rules. For example, an iPhone with a Samsung charger cube.

Features

  • Disconnects USB data lines between the host and device, preventing attacks such as "juice jacking" and keeps trusted computers from trying to sync
  • Slider switches which allow you to tell your device what kind of charger is connected. Select from dedicated charger port, Sony, open circuit, and four different Apple chargers; 500mA, 1A, 2.1A, and 2.5A.
  • USB-B and USB-micro-B connectors on the power side
  • USB-A on the device side

License

This work is released under the Creative Commons Attribution-Sharealike 3.0 license. See http://creativecommons.org/licenses/by-sa/3.0/ or the included license/LICENSE.TXT file for more information.