browser.js
66f34df107aadrf-api-tracking

browser.js
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			'use strict'

			// limit of Crypto.getRandomValues()
			// https://developer.mozilla.org/en-US/docs/Web/API/Crypto/getRandomValues
			var MAX_BYTES = 65536

			// Node supports requesting up to this number of bytes
			// https://github.com/nodejs/node/blob/master/lib/internal/crypto/random.js#L48
			var MAX_UINT32 = 4294967295

			function oldBrowser () {
			throw new Error('Secure random number generation is not supported by this browser.\nUse Chrome, Firefox or Internet Explorer 11')
			}

			var Buffer = require('safe-buffer').Buffer
			var crypto = global.crypto \|\| global.msCrypto

			if (crypto && crypto.getRandomValues) {
			module.exports = randomBytes
			} else {
			module.exports = oldBrowser
			}

			function randomBytes (size, cb) {
			// phantomjs needs to throw
			if (size > MAX_UINT32) throw new RangeError('requested too many random bytes')

			var bytes = Buffer.allocUnsafe(size)

			if (size > 0) { // getRandomValues fails on IE if size == 0
			if (size > MAX_BYTES) { // this is the max bytes crypto.getRandomValues
			// can do at once see https://developer.mozilla.org/en-US/docs/Web/API/window.crypto.getRandomValues
			for (var generated = 0; generated < size; generated += MAX_BYTES) {
			// buffer.slice automatically checks if the end is past the end of
			// the buffer so we don't have to here
			crypto.getRandomValues(bytes.slice(generated, generated + MAX_BYTES))
			}
			} else {
			crypto.getRandomValues(bytes)
			}
			}

			if (typeof cb === 'function') {
			return process.nextTick(function () {
			cb(null, bytes)
			})
			}

			return bytes
			}