isomorphic-webcrypto

webcrypto library for Node, React Native and IE11+

What?

There's a great Node polyfill for the Web Crypto API, but it's not isomorphic.

IE11 and versions of Safari < 11 use an older version of the spec, so the browser implementation includes a webcrypto-shim to iron out the differences. You'll still need to provide your own Promise polyfill.

There's currently no native crypto support in React Native, so the Microsoft Research library is exposed.

Install

npm install isomorphic-webcrypto

Usage

There's a simple example below, but there are many more here.

const crypto = require('isomorphic-webcrypto')
// or
import crypto from 'isomorphic-webcrypto'

crypto.subtle.digest(
  { name: 'SHA-256' },
  new Uint8Array([1,2,3]).buffer
)
.then(hash => {
  // do something with the hash buffer
})

Compatibility

• IE11+
• Safari 8+
• Edge 12+
• Chrome 43+
• Opera 24+
• Firefox 34+
• Node 4+
• React Native

React Native

React Native support is implemented using the Microsoft Research library. The React Native environment only supports Math.random(), so react-native-securerandom is used to provide proper entropy. This is handled automatically, except for crypto.getRandomValues(), which requires you wait:

const crypto = require('isomorphic-webcrypto')

// Only needed for crypto.getRandomValues
crypto.ensureSecure(err => {
  if (err) throw err
  const safeValues = crypto.getRandomValues();
  // Only wait once, future calls are secure
})

I just want to drop in a script tag

You should use the webcrypto-shim library directly:

<!-- Any Promise polyfill will do -->
<script src="https://unpkg.com/bluebird"></script>
<script src="https://unpkg.com/webcrypto-shim"></script>

License

MIT