Handle reference data not found in metadata command (#558)

src/apdu.rs

@@ -421,6 +421,9 @@ pub(crate) enum StatusWords {
     /// Not enough memory
     NoSpaceError,
 
+    /// Referenced data or reference data not found
+    ReferenceDataNotFoundError,
+
     //
     // Custom Yubico Status Word extensions
     //
@@ -454,6 +457,7 @@ impl StatusWords {
             StatusWords::IncorrectParamError => 0x6a80,
             StatusWords::NotFoundError => 0x6a82,
             StatusWords::NoSpaceError => 0x6a84,
+            StatusWords::ReferenceDataNotFoundError => 0x6a88,
             StatusWords::IncorrectSlotError => 0x6b00,
             StatusWords::NotSupportedError => 0x6d00,
             StatusWords::CommandAbortedError => 0x6f00,
@@ -488,6 +492,7 @@ impl From<u16> for StatusWords {
             0x6a80 => StatusWords::IncorrectParamError,
             0x6a82 => StatusWords::NotFoundError,
             0x6a84 => StatusWords::NoSpaceError,
+            0x6a88 => StatusWords::ReferenceDataNotFoundError,
             0x6b00 => StatusWords::IncorrectSlotError,
             0x6d00 => StatusWords::NotSupportedError,
             0x6f00 => StatusWords::CommandAbortedError,

src/transaction.rs

@@ -163,17 +163,16 @@ impl<'tx> Transaction<'tx> {
             .p2(slot.into())
             .transmit(self, CB_OBJ_MAX)?;
 
-        if !response.is_success() {
-            if response.status_words() == StatusWords::NotSupportedError {
-                return Err(Error::NotSupported); // Requires firmware 5.2.3
-            } else {
-                return Err(Error::GenericError);
+        match response.status_words() {
+            StatusWords::Success => {
+                let buf = Buffer::new(response.data().into());
+                piv::SlotMetadata::try_from(buf)
             }
+            StatusWords::ReferenceDataNotFoundError => Err(Error::NotFound),
+            // Requires firmware 5.2.3
+            StatusWords::NotSupportedError => Err(Error::NotSupported),
+            _ => Err(Error::GenericError),
         }
-
-        let buf = Buffer::new(response.data().into());
-
-        piv::SlotMetadata::try_from(buf)
     }
 
     /// Verify device PIN.