Fix encoding for account permissioning check call

ethereum/permissioning/src/main/java/tech/pegasys/pantheon/ethereum/permissioning/TransactionSmartContractPermissioningController.java

@@ -219,9 +219,11 @@ private static BytesValue encodeLong(final long l) {
 
   // A bytes array is a uint256 of its length, then the bytes that make up its value, then pad to
   // next 32 bytes interval
+  // It needs to be preceded by the bytes offset of the first dynamic parameter (192 bytes)
   private static BytesValue encodeBytes(final BytesValue value) {
+    final BytesValue dynamicParameterOffset = encodeLong(192);
     final BytesValue length = encodeLong(value.size());
     final BytesValue padding = BytesValue.wrap(new byte[(32 - (value.size() % 32))]);
-    return BytesValues.concatenate(length, value, padding);
+    return BytesValues.concatenate(dynamicParameterOffset, length, value, padding);
   }
 }

ethereum/permissioning/src/test/java/tech/pegasys/pantheon/ethereum/permissioning/TransactionSmartContractPermissioningControllerTest.java

@@ -98,7 +98,7 @@ private Transaction transactionForAccount(final Address address) {
         .value(Wei.ZERO)
         .gasPrice(Wei.ZERO)
         .gasLimit(0)
-        .payload(BytesValue.EMPTY)
+        .payload(BytesValue.fromHexString("0x1234"))
         .nonce(1)
         .signature(Signature.create(BigInteger.ONE, BigInteger.TEN, (byte) 1))
         .build();