Have a more useful "empty" applet

martinpaljak · Sep 28, 2024 · 2943f21 · 2943f21
1 parent 6446dc5
commit 2943f21
Showing 1 changed file with 16 additions and 9 deletions.
diff --git a/src/testapplets/empty/Empty.java b/src/testapplets/empty/Empty.java
@@ -2,20 +2,27 @@
 
 import javacard.framework.APDU;
 import javacard.framework.Applet;
+import javacard.framework.ISO7816;
 import javacard.framework.ISOException;
 import javacard.security.CryptoException;
 
 public class Empty extends Applet {
 
-	private Empty(byte[] parameters, short offset, byte length) {
-		register(parameters, (short) (offset + 1), parameters[offset]);
-	}
+    private Empty(byte[] parameters, short offset, byte length) {
+        register(parameters, (short) (offset + 1), parameters[offset]);
+    }
 
-	public static void install(byte[] parameters, short offset, byte length) {
-		new Empty(parameters, offset, length);
-	}
+    public static void install(byte[] parameters, short offset, byte length) {
+        new Empty(parameters, offset, length);
+    }
 
-	public void process(APDU arg0) throws ISOException {
-		CryptoException.throwIt((short) 0x6666);
-	}
+    public void process(APDU apdu) throws ISOException {
+        if (selectingApplet())
+            return;
+        byte[] buffer = apdu.getBuffer();
+        if (buffer[ISO7816.OFFSET_LC] != (short) 6)
+            CryptoException.throwIt((short) 0x6666);
+        apdu.setIncomingAndReceive();
+        apdu.setOutgoingAndSend((short) 0, (short) 11);
+    }
 }