title: Using an RSA public key on iOS
body: <p>I am working on an application where I will retrieve a public key for a user from our server.  Once I have it, I need to do a RSA encryption using the public key.  The public key obtained from the server is Base64 encoded.  </p>
  
  <p>How do I load the public key into the iOS KeyChain so that I can perform RSA cryptographic functions with it?  Certificate loading seems to be trivial, but raw public keys don't.</p>