title: createObjectUrl for binary data fails
body: <p>In my javascript I have a base64 encoded pkcs12 object, which I want to provide as download link. The Pkcs12 (pfx) file to be downloaded is binary data.</p>
  
  <p>So I decoded the object and tried to create an objectUrl from it:</p>
  
  <pre><code>var bin = atob(pkcs12);
  var blob = new Blob([bin],
          { type : 'application/x-pkcs12' });
  $scope.pkcs12Blob = (window.URL || window.webkitURL).createObjectURL( blob );
  </code></pre>
  
  <p>The problem is, that the downloaded file is bigger than the original binary data and is not recognized as pkcs12. It looks like as if some utf-8/unicode stuff was introduced into the file.</p>
  
  <p>If I provide the original base64 encoded data to the createObjectURL and download the base64 encoded file, I can decode the downloaded file and get a valid p12 file.</p>
  
  <p>So I am wondering: How does createObjectURL work for binary data?</p>