feat: add nop measurement

crocs-muni · Apr 12, 2024 · 12bfde1 · 12bfde1
1 parent 4ddd6f3
commit 12bfde1
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diff --git a/applet/src/main/java/jcmint/Consts.java b/applet/src/main/java/jcmint/Consts.java
@@ -14,6 +14,7 @@ public class Consts {
     public static final byte INS_SWAP_SINGLE = (byte) 0x05;
     public static final byte INS_REDEEM = (byte) 0x06;
     public static final byte INS_REDEEM_SINGLE = (byte) 0x07;
+    public static final byte INS_NOP = (byte) 0x08;
 
     public final static short E_ALREADY_INITIALIZED = (short) 0xee00;
     public final static short E_INVALID_PARTY_COUNT = (short) 0xee01;

diff --git a/applet/src/main/java/jcmint/JCMint.java b/applet/src/main/java/jcmint/JCMint.java
@@ -72,6 +72,9 @@ public void process(APDU apdu) {
                 case Consts.INS_REDEEM_SINGLE:
                     redeemSingle(apdu);
                     break;
+                case Consts.INS_NOP:
+                    apdu.setOutgoing();
+                    break;
                 default:
                     ISOException.throwIt(ISO7816.SW_INS_NOT_SUPPORTED);
             }

diff --git a/applet/src/test/java/tests/PerformanceTest.java b/applet/src/test/java/tests/PerformanceTest.java
@@ -106,6 +106,17 @@ public void measureVerifyRedeemPrecomputed() throws Exception {
         }
     }
 
+    @Test
+    public void measureNop() throws Exception {
+        String fileName = "nop.csv";
+        PrintWriter file = new PrintWriter(new FileWriter(fileName, false));
+        ProtocolManager pm = new ProtocolManager(connect(), (byte) 0);
+        for (int i = 0; i < REPEAT; ++i) {
+            pm.nop();
+            file.printf("%d\n", pm.cm.getLastTransmitTime());
+        }
+    }
+
     public void verifySwap(boolean precomputed, int parties) throws Exception {
         String fileName = "verify_swap_" + parties + (precomputed ? "_precomputed" : "") + ".csv";
         PrintWriter file = new PrintWriter(new FileWriter(fileName, false));

diff --git a/applet/src/test/java/tests/ProtocolManager.java b/applet/src/test/java/tests/ProtocolManager.java
@@ -176,6 +176,19 @@ public boolean redeemSingle(byte[] message, ECPoint token, ECPoint precomputed)
         return true;
     }
 
+    public void nop() throws Exception {
+        CommandAPDU cmd = new CommandAPDU(
+                Consts.CLA_JCMINT,
+                Consts.INS_NOP,
+                (byte) 0,
+                (byte) 0
+        );
+        ResponseAPDU responseAPDU = cm.transmit(cmd);
+        Assertions.assertNotNull(responseAPDU);
+        Assertions.assertEquals(ISO7816.SW_NO_ERROR & 0xffff, responseAPDU.getSW());
+        Assertions.assertArrayEquals(new byte[0], responseAPDU.getData());
+    }
+
     public static byte[] computeProof(BigInteger secret, ECPoint hashedPoint) throws Exception {
         ECPoint verifyingPoint = hashedPoint.multiply(secret);