autodetect passive nfc operation or usb operation

fido2/ctap.c

@@ -1536,7 +1536,7 @@ static void ctap_state_init()
     ctap_reset_rk();
 }
 
-void ctap_init(int init_pin)
+void ctap_init()
 {
     crypto_ecc256_init();
 
@@ -1591,7 +1591,7 @@ void ctap_init(int init_pin)
         exit(1);
     }
 
-    if (init_pin)
+    if (! device_is_nfc())
     {
         crypto_ecc256_make_key_pair(KEY_AGREEMENT_PUB, KEY_AGREEMENT_PRIV);
     }

fido2/ctap.h

@@ -267,7 +267,7 @@ uint8_t ctap_request(uint8_t * pkt_raw, int length, CTAP_RESPONSE * resp);
 int ctap_encode_der_sig(uint8_t const * const in_sigbuf, uint8_t * const out_sigder);
 
 // Run ctap related power-up procedures (init pinToken, generate shared secret)
-void ctap_init(int init_pin);
+void ctap_init();
 
 // Resets state between different accesses of different applications
 void ctap_reset_state();