title: Is possible to run code on a NFC card like Mifare DESfire?
body: <p>I am very new to the smart cards and I think I have misunderstood some things.</p>
  
  <p>I want to be able to sign messages using ECDSA with the card's private key(s). Also have some custom logic for key derivation.</p>
  
  <p>Is it possible with Mifare DESFire? If not, what other NFC smart cards could do that?</p>
  
  <p>Thanks</p>