1 files changed, 56 insertions, 0 deletions
diff --git a/src/cz/crcs/ectester/applet/AppletUtil.java b/src/cz/crcs/ectester/applet/AppletUtil.java
new file mode 100644
index 0000000..532b44e
--- /dev/null
+++ b/src/cz/crcs/ectester/applet/AppletUtil.java
@@ -0,0 +1,56 @@
+package cz.crcs.ectester.applet;
+
+import javacard.framework.APDU;
+import javacard.framework.ISO7816;
+import javacard.framework.ISOException;
+import javacard.framework.Util;
+import javacard.security.KeyAgreement;
+import javacard.security.KeyPair;
+import javacard.security.Signature;
+
+/**
+ * @author Jan Jancar johny@neuromancer.sk
+ */
+public class AppletUtil {
+
+    private static short nullCheck(Object obj, short sw) {
+        if (obj == null)
+            ISOException.throwIt(sw);
+        return ISO7816.SW_NO_ERROR;
+    }
+
+    public static short objCheck(Object obj) {
+        return nullCheck(obj, ECTesterApplet.SW_OBJECT_NULL);
+    }
+
+    public static short keypairCheck(KeyPair keyPair) {
+        return nullCheck(keyPair, ECTesterApplet.SW_KEYPAIR_NULL);
+    }
+
+    public static short kaCheck(KeyAgreement keyAgreement) {
+        return nullCheck(keyAgreement, ECTesterApplet.SW_KA_NULL);
+    }
+
+    public static short signCheck(Signature signature) {
+        return nullCheck(signature, ECTesterApplet.SW_SIGNATURE_NULL);
+    }
+
+    public static short readAPDU(APDU apdu, byte[] buffer, short length) {
+        short read = apdu.setIncomingAndReceive();
+        read += apdu.getOffsetCdata();
+        short total = apdu.getIncomingLength();
+        if (total > length) {
+            return 0;
+        }
+        byte[] apduBuffer = apdu.getBuffer();
+
+        short sum = 0;
+
+        do {
+            Util.arrayCopyNonAtomic(apduBuffer, (short) 0, buffer, sum, read);
+            sum += read;
+            read = apdu.receiveBytes((short) 0);
+        } while (sum < total);
+        return 0;
+    }
+}