edits

[iotcloud.git] / version2 / src / java / iotcloud / CloudComm.java

diff --git a/version2/src/java/iotcloud/CloudComm.java b/version2/src/java/iotcloud/CloudComm.java
index d0a514d30cd5a3f12ce3c13efcf69b6e4873ebe1..f12c2764e0a04520c94b6a094fd25c43266cf4f0 100644 (file)
--- a/version2/src/java/iotcloud/CloudComm.java
+++ b/version2/src/java/iotcloud/CloudComm.java
@@ -8,6 +8,9 @@ import javax.crypto.spec.*;
 import java.security.SecureRandom;
 import java.nio.ByteBuffer;
 
+
+import java.util.*;
+
 /**
  * This class provides a communication API to the webserver.  It also
  * validates the HMACs on the slots and handles encryption.
@@ -247,7 +250,8 @@ class CloudComm {
        private byte[] createIV(long machineId, long localSequenceNumber) {
                ByteBuffer buffer = ByteBuffer.allocate(IV_SIZE);
                buffer.putLong(machineId);
-               buffer.putLong(localSequenceNumber);
+               long localSequenceNumberShifted = localSequenceNumber << 16;
+               buffer.putLong(localSequenceNumberShifted);
                return buffer.array();
 
        }
@@ -255,7 +259,7 @@ class CloudComm {
        private byte[] encryptSlotAndPrependIV(byte[] rawData, byte[] ivBytes) {
                try {
                        IvParameterSpec ivSpec = new IvParameterSpec(ivBytes);
-                       Cipher cipher = Cipher.getInstance("AES/CTR/PKCS5Padding");
+                       Cipher cipher = Cipher.getInstance("AES/CTR/NoPadding");
                        cipher.init(Cipher.ENCRYPT_MODE, key, ivSpec);
 
                        byte[] encryptedBytes = cipher.doFinal(rawData);
@@ -282,9 +286,8 @@ class CloudComm {
 
                        IvParameterSpec ivSpec = new IvParameterSpec(ivBytes);
 
-                       Cipher cipher = Cipher.getInstance("AES/CTR/PKCS5Padding");
+                       Cipher cipher = Cipher.getInstance("AES/CTR/NoPadding");
                        cipher.init(Cipher.DECRYPT_MODE, key, ivSpec);
-
                        return cipher.doFinal(encryptedBytes);
 
                } catch (Exception e) {