From 5f622339b1d48a1f0968405dde37481bda794b8e Mon Sep 17 00:00:00 2001
From: Vincent Breitmoser <look@my.amazin.horse>
Date: Mon, 30 Oct 2017 17:01:49 +0100
Subject: [PATCH] Output usb data to debug log

---
 .../keychain/securitytoken/usb/UsbTransport.java    | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/securitytoken/usb/UsbTransport.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/securitytoken/usb/UsbTransport.java
index 7c52994e2..5b066d630 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/securitytoken/usb/UsbTransport.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/securitytoken/usb/UsbTransport.java
@@ -30,6 +30,7 @@ import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 import android.util.Pair;
 
+import org.bouncycastle.util.encoders.Hex;
 import org.sufficientlysecure.keychain.Constants;
 import org.sufficientlysecure.keychain.securitytoken.CommandApdu;
 import org.sufficientlysecure.keychain.securitytoken.ResponseApdu;
@@ -152,7 +153,17 @@ public class UsbTransport implements Transport {
      */
     @Override
     public ResponseApdu transceive(CommandApdu data) throws UsbTransportException {
-        return ResponseApdu.fromBytes(ccidTransportProtocol.transceive(data.toBytes()));
+        byte[] rawCommand = data.toBytes();
+        if (Constants.DEBUG) {
+            Log.d(Constants.TAG, "USB >> " + Hex.toHexString(rawCommand));
+        }
+
+        byte[] rawResponse = ccidTransportProtocol.transceive(rawCommand);
+        if (Constants.DEBUG) {
+            Log.d(Constants.TAG, "USB << " + Hex.toHexString(rawResponse));
+        }
+
+        return ResponseApdu.fromBytes(rawResponse);
     }
 
     @Override