randombytes

randombytes from node that works in the browser. In node you just get crypto.randomBytes, but in the browser it uses .crypto/msCrypto.getRandomValues

var randomBytes = require('randombytes');
randomBytes(16);//get 16 random bytes
randomBytes(16, function (err, resp) {
  // resp is 16 random bytes
});

Bring your own crypto

var randomBytes = require('randombytes');

// set your own crypto supporting `randomBytes` function
randomBytes._compat({
  randomBytes: function (size, cb) {
    // your own implementation of randomBytes here
  }
});

randomBytes(16); //get 16 random bytes