add vendor function (GET_COUNT 0x45)

return number of credentials

.idea/.name

+newJavaCardApplet
\ No newline at end of file

.idea/gradle.xml

@@ -4,6 +4,8 @@
   <component name="GradleSettings">
     <option name="linkedExternalProjectsSettings">
       <GradleProjectSettings>
+        <option name="delegatedBuild" value="false" />
+        <option name="testRunner" value="PLATFORM" />
         <option name="distributionType" value="DEFAULT_WRAPPED" />
         <option name="externalProjectPath" value="$PROJECT_DIR$" />
         <option name="modules">

src/main/java/com/josh/vku2f/CTAP2.java

@@ -35,6 +35,7 @@ import javacardx.apdu.ExtendedLength;
 
 public class CTAP2 extends Applet implements ExtendedLength {
 
+    private static final byte FIDO2_VENDOR_GET_COUNT = (byte)0x45;
     private CBORDecoder cborDecoder;
     private CBOREncoder cborEncoder;
 
@@ -190,22 +191,25 @@ public class CTAP2 extends Applet implements ExtendedLength {
             case FIDO2_AUTHENTICATOR_GET_NEXT_ASSERTION:
                 authGetNextAssertion(apdu, buffer);
                 break;
-            case FIDO2_VENDOR_ATTEST_SIGN:
+            case FIDO2_VENDOR_ATTEST_SIGN: //0x41
                 attestSignRaw(apdu, vars[3]);
                 break;
-            case FIDO2_VENDOR_ATTEST_LOADCERT:
+            case FIDO2_VENDOR_ATTEST_LOADCERT: //0x42
                 attestSetCert(apdu, vars[3]);
                 break;
-            case FIDO2_VENDOR_PERSO_COMPLETE:
+            case FIDO2_VENDOR_PERSO_COMPLETE: //0x43
                 persoComplete(apdu);
                 break;
-            case FIDO2_VENDOR_ATTEST_GETPUB:
+            case FIDO2_VENDOR_ATTEST_GETPUB: //0x44
                 getAttestPublic(apdu);
                 break;
-            case FIDO2_VENDOR_ATTEST_GETCERT:
+            case FIDO2_VENDOR_ATTEST_GETCERT: //0x4a
                 getCert(apdu);
                 break;
-            case FIDO2_AUTHENTICATOR_RESET:
+            case FIDO2_VENDOR_GET_COUNT: //0x45
+                getCount(apdu);
+                break;
+            case FIDO2_AUTHENTICATOR_RESET: //0x07
                 // Need to finish doing this, we can, i mean, but I don't like it
                 doReset(apdu);
                 break;
@@ -244,6 +248,15 @@ public class CTAP2 extends Applet implements ExtendedLength {
         apdu.sendBytesLong(inBuf, (short) 0, vars[0]);
     }
 
+    /** get counter's value */
+    public void getCount(APDU apdu){
+        short count = discoverableCreds.getCount();
+        apdu.setOutgoing();
+        apdu.setOutgoingLength((short)2);
+        Util.setShort(inBuf,(short)0, count);
+        apdu.sendBytesLong(inBuf,(short)0,(short)2);
+    }
+
     /**
      * Performs raw signatures, may only occur when personalisation is not complete.
      * 
@@ -1024,7 +1037,7 @@ public class CTAP2 extends Applet implements ExtendedLength {
                     ISOException.throwIt(ISO7816.SW_CONDITIONS_NOT_SATISFIED);
                 }
                 break;
-            case FIDO2_INS_NFCCTAP_MSG:
+            case FIDO2_INS_NFCCTAP_MSG: // 0x10
                 handle(apdu);
                 break;
             case FIDO2_DESELECT:

src/main/java/com/josh/vku2f/CredentialArray.java

@@ -27,6 +27,7 @@ public class CredentialArray {
     private boolean[] slotStatus;
     private short size;
     private short counter;
+    private short count = 0;//the number of creds in the array
 
     /**
      * Constructor for a CredentialArray.
@@ -46,6 +47,7 @@ public class CredentialArray {
             short slot = alreadyExists(in);
             creds[slot] = in;
             slotStatus[slot] = true;
+            count = (short)(slot + 1);
         } catch (Exception e) {
             UserException.throwIt(CTAP2.CTAP2_ERR_KEY_STORE_FULL);
         }
@@ -117,6 +119,10 @@ public class CredentialArray {
     public short getLength() {
         return size;
     }
+
+    public short getCount(){
+        return count;
+    }
     /**
      * Returns the credential at position, or null if none.
      * @param position the position to get.