title: Standard way to hash an RSA key?
body: <p>What's the algorithm for creating hash (sha-1 or MD5) of an RSA public key?  Is there a standard way to do this?  Hash just the modulus, string addition of both and then take a hash?  Is SHA-1 or MD5 usually used?</p>
  
  <p>I want to use it to ensure that I got the right key (have the sender send a hash, and I calculate it myself), and log said hash so I always know which exact key I used when I encrypt the payload.</p>