nassh: Improve TLV parsing for constructed DOs

Some smart cards respond to GET DATA requests for constructed data
objects with a TLV-encoded constructed tag, other cards simply return a
TLV-encoded list of the subtags. In order to properly parse both types
of response, we package lists of tags into an artificial constructed

In addition, skip both 0x00 and 0xFF bytes that appear between tags.

Change-Id: I08c656bd61cb8383d0d457d8b79081046b2d4e9c
Tested-by: Fabian Henneke <>
Reviewed-by: Mike Frysinger <>
1 file changed
tree: fdcaa570edcfcec3a5f860d56acd3b5a80ce1ada
  1. .gitignore
  5. hterm/
  6. libdot/
  7. nassh/
  8. package.json
  9. saltpig/
  10. ssh_client/
  11. wam/
  12. wash/


This repository contains the libdot JavaScript library and some web applications that make use of it.

The official copy of this repository is hosted at

There is also a mirror on github at Keep in mind that this mirror may occasionally be behind the official repository.

All changes must go through the Gerrit code review server on Github pull requests cannot be accepted. Please see the document in this directory for the details.

Top level directories

  • libdot/ is a small set of JS libraries initially developed as part of hterm, now available as shared code. It provides a base layer for web applications. The code is intended to work in any modern browser, in either a plain web page or a “privileged” environment such as a Chrome platform application or Firefox extension. In practice, it's only been put to use in Chrome platform applications so far.

  • hterm/ is a JS library that provides a terminal emulator. It is reasonably fast, reasonably correct, and reasonably portable across browsers.

  • nassh/ is the Secure Shell Chrome App (currently a “v1.5” app, soon to become a “v2” or platform app) that combines hterm with a NaCl build of OpenSSH to provide a PuTTY-like app for Chrome users.

  • ssh_client/ is the NaCl port of OpenSSH. It is used by nassh to create the Secure Shell App.

  • wash/ is a library for cross-origin virtual filesystems, similar to the Plan 9 filesystem. This directory also contains a simple bash-like shell environment for exploring these filesystems. The code in this directory is a work-in-progress.