DO is cleared when no data is provided.

Solves #50.

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

src/openpgp/cmd_put_data.c

@@ -45,8 +45,9 @@ int cmd_put_data() {
     if (currentEF && currentEF->fid == fid) { // previously selected same EF
         ef = currentEF;
     }
-    if (apdu.nc > 0 && (ef->type & FILE_DATA_FLASH)) {
+    if (ef->type & FILE_DATA_FLASH) {
         int r = 0;
+        if (apdu.nc > 0) {
             if (fid == EF_RC) {
                 has_rc = false;
                 if ((r = load_dek()) != PICOKEY_OK) {
@@ -76,5 +77,9 @@ int cmd_put_data() {
             }
             low_flash_available();
         }
+        else {
+            delete_file(ef);
+        }
+    }
     return SW_OK();
 }