Added backfall compatibility.

Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>

src/fido/cbor.c

@@ -25,6 +25,7 @@
 #include "apdu.h"
 #include "management.h"
 #include "ctap2_cbor.h"
+#include "version.h"
 
 const bool _btrue = true, _bfalse = false;
 
@@ -40,6 +41,8 @@ int cbor_config(const uint8_t *data, size_t len);
 int cbor_vendor(const uint8_t *data, size_t len);
 int cbor_large_blobs(const uint8_t *data, size_t len);
 
+extern int cmd_read_config();
+
 const uint8_t aaguid[16] =
 { 0x89, 0xFB, 0x94, 0xB7, 0x06, 0xC9, 0x36, 0x73, 0x9B, 0x7E, 0x30, 0x52, 0x6D, 0x96, 0x81, 0x45 };                          // First 16 bytes of SHA256("Pico FIDO2")
 
@@ -91,6 +94,12 @@ int cbor_parse(uint8_t cmd, const uint8_t *data, size_t len) {
         else if (cmd == CTAP_VENDOR_CBOR) {
             return cbor_vendor(data, len);
         }
+        else if (cmd == 0xC2) {
+            if (cmd_read_config() == 0x9000) {
+                res_APDU_size -= 1;
+                return 0;
+            }
+        }
     }
     return CTAP1_ERR_INVALID_CMD;
 }