title: Import RSA keys to iPhone keychain?
body: <p>I have a couple of NSString objects that represent an RSA public-private keypair (not generated by SecKeyCreatePair, but by an external crypto library). How can I create SecKeyRef objects (which are required for the SecKeyDecrypt/Encrypt methods) from these NSString objects?</p>
  
  <p>Do I need to import them into the Keychain first? If so, how?</p>
  
  <p>Thanks!</p>