https://github.com/cardid/webcard

Smart Card Browser Extension
https://github.com/cardid/webcard

smart-cards

Last synced: about 2 months ago
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Smart Card Browser Extension

• Host: GitHub
• URL: https://github.com/cardid/webcard
• Owner: cardid
• License: mit
• Created: 2020-08-27T16:41:56.000Z (about 4 years ago)
• Default Branch: main
• Last Pushed: 2023-10-12T15:20:05.000Z (12 months ago)
• Last Synced: 2024-07-21T17:46:28.710Z (2 months ago)
• Topics: smart-cards
• Language: C
• Homepage: https://webcard.cardid.org
• Size: 345 KB
• Stars: 44
• Watchers: 6
• Forks: 14
• Open Issues: 8
• Metadata Files:
  • Readme: README.md
  • License: LICENSE.md

Awesome Lists containing this project

• awesome-smart-card - webcard

README

        
# Smart Card Browser Extension

This smart card browser extension is an attempt to provide a bridge between the JavaScript world that a Web developer is familiar with, and the native smart card subsystems available in desktop platforms. It works in Windows 10 and 11, macOS and Linux.

The idea is that a Web developer who wants to have low level access to smart cards in the machine where the browser is running would add a `webcard.js` file to the page. That script would in turn check if the extension is installed and if not prompt the user to install it.

The extension adds a `webcard` object to `navigator` and through it `navigator.webcard.readers` provides a list of the smart card `reader` objects available in the machine. 

Each `reader` has a `name` and an `atr` if there is a card inserted on it.

`reader` has three methods:

- `connect` to establish a connection with the inserted card. It receives an optional argument to indicate if the connection should be exclusive or not (shared) the default is `true`

- `transcieve` that sends the APDU passed as a hexidecimal string and returs the response also as a hexadecimal string

- `disconnect` closes the connection

## Installing

Currently this development version requires manual installation of the unpacked extension:

1. Build the native client for your platfrom, running either `make` (macOS) or `MSBuild webcard.vcxproj` (Windows) in the `native` folder

2. Install the native client running `install.sh` (macOS) or `install.bat` (Windows) in the `native` folder

3. Open Chrome -> Extensions, enable developer mode and add the unpacked extension from the `extension` folder.

4. Open the test page, for example running `python3 -m http.server` from the `test` folder and then navigate to http://localhost:8000

## Native Messages

Messages to native:

```

{i: 'string', c: integer, r: integer, a: 'string', p: integer}

```

i: unique message identifier

c: command 1-list readers, 2-connect, 3-disconnect, 4-transcieve

r: index of reader in reader list

a: hex cAPDU to send to the card, sent only for c: 4

p: parameter, share mode for connect, sent only for c: 2

Messages from native:

```

{i: 'string', e: integer, r: integer, d: [array]|'string'}

```

i: unique message identifier, to link the response. Empty string on reader events

e: reader event 1-card insert, 2-card remove. Sent only for reader events

r: reader index for reader events

d: data 1-string array with list of readers, 2-card atr, 4-hex rAPDU

## Alternatives

There are apparently many options for [smart card extensions](https://chrome.google.com/webstore/search/smart%20card?hl=en-US&_category=extensions) in the Chrome store. But I could not figure out how to use them for raw APDU exchange. Maybe one of those is more suitable for your project.