node fixes, updates

1 files changed, 50 insertions, 0 deletions

diff --git a/node_modules/randombytes/browser.js b/node_modules/randombytes/browser.js
new file mode 100644
index 00000000..0fb0b715
--- /dev/null
+++ b/node_modules/randombytes/browser.js
@@ -0,0 +1,50 @@
+'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
+}