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node_modules/randombytes/browser.js

@@ -1,5 +1,13 @@
 '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')
 }
@@ -15,19 +23,23 @@ if (crypto && crypto.getRandomValues) {
 
 function randomBytes (size, cb) {
   // phantomjs needs to throw
-  if (size > 65536) throw new Error('requested too many random bytes')
-  // in case browserify  isn't using the Uint8Array version
-  var rawBytes = new global.Uint8Array(size)
+  if (size > MAX_UINT32) throw new RangeError('requested too many random bytes')
+
+  var bytes = Buffer.allocUnsafe(size)
 
-  // This will not work in older browsers.
-  // See https://developer.mozilla.org/en-US/docs/Web/API/window.crypto.getRandomValues
   if (size > 0) {  // getRandomValues fails on IE if size == 0
-    crypto.getRandomValues(rawBytes)
+    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)
+    }
   }
 
-  // XXX: phantomjs doesn't like a buffer being passed here
-  var bytes = Buffer.from(rawBytes.buffer)
-
   if (typeof cb === 'function') {
     return process.nextTick(function () {
       cb(null, bytes)