Polyfill for crypto

[tolotrasamuel]

When using uuid, it fails because of:
https://github.com/uuidjs/uuid#getrandomvalues-not-supported

It would be great to have the native platform (Android, iOS or even just Dart) polyfill crypto.getRandomValues

function insecureRandomValues (array: Uint8Array): Uint8Array {
  let r = 0;

  for (let i = 0; i < array.length; i++) {
    if ((i & 0x03) === 0) {
      r = Math.random() * 0x100000000;
    }
    array[i] = (r >>> ((i & 0x03) << 3)) & 0xff;
  }

  return array;
}

works but is insecure