title: Objective-C library recommendation for AES-256 in CTR mode
body: <p>I'm looking for recommendations on an Objective-C library for AES-256 encryption in CTR mode. I have a database full of data encrypted with <a href="https://stackoverflow.com/questions/2529772/interoperability-between-two-aes-algorithms">another library using CTR</a> and seems the included CCCrypt only supports ECB or CBC with PKCS#7.</p>
  
  <p>Any idea on the best portable library I should use? I'm not looking to port the original implementation as I don't have the required knowledge in cryptography and hence, that's-a-bad-idea (tm).</p>
  
  <p>Thanks!</p>