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diff --git a/third-party/openflowj/src/main/java/org/openflow/util/Unsigned.java b/third-party/openflowj/src/main/java/org/openflow/util/Unsigned.java
new file mode 100644
index 0000000000..f2e40e6473
--- /dev/null
+++ b/third-party/openflowj/src/main/java/org/openflow/util/Unsigned.java
@@ -0,0 +1,195 @@
+package org.openflow.util;
+
+import java.math.BigInteger;
+import java.nio.ByteBuffer;
+
+/*****
+ * A util library class for dealing with the lack of unsigned datatypes in Java
+ *
+ * @author Rob Sherwood (rob.sherwood@stanford.edu)
+ * @author David Erickson (daviderickson@cs.stanford.edu)
+ */
+
+public class Unsigned {
+    /**
+     * Get an unsigned byte from the current position of the ByteBuffer
+     *
+     * @param bb ByteBuffer to get the byte from
+     * @return an unsigned byte contained in a short
+     */
+    public static short getUnsignedByte(ByteBuffer bb) {
+        return ((short) (bb.get() & (short) 0xff));
+    }
+
+    /**
+     * Get an unsigned byte from the specified offset in the ByteBuffer
+     *
+     * @param bb ByteBuffer to get the byte from
+     * @param offset the offset to get the byte from
+     * @return an unsigned byte contained in a short
+     */
+    public static short getUnsignedByte(ByteBuffer bb, int offset) {
+        return ((short) (bb.get(offset) & (short) 0xff));
+    }
+
+    /**
+     * Put an unsigned byte into the specified ByteBuffer at the current
+     * position
+     *
+     * @param bb ByteBuffer to put the byte into
+     * @param v the short containing the unsigned byte
+     */
+    public static void putUnsignedByte(ByteBuffer bb, short v) {
+        bb.put((byte) (v & 0xff));
+    }
+
+    /**
+     * Put an unsigned byte into the specified ByteBuffer at the specified
+     * offset
+     *
+     * @param bb ByteBuffer to put the byte into
+     * @param v the short containing the unsigned byte
+     * @param offset the offset to insert the unsigned byte at
+     */
+    public static void putUnsignedByte(ByteBuffer bb, short v, int offset) {
+        bb.put(offset, (byte) (v & 0xff));
+    }
+
+    /**
+     * Get an unsigned short from the current position of the ByteBuffer
+     *
+     * @param bb ByteBuffer to get the byte from
+     * @return an unsigned short contained in a int
+     */
+    public static int getUnsignedShort(ByteBuffer bb) {
+        return (bb.getShort() & 0xffff);
+    }
+
+    /**
+     * Get an unsigned short from the specified offset in the ByteBuffer
+     *
+     * @param bb ByteBuffer to get the short from
+     * @param offset the offset to get the short from
+     * @return an unsigned short contained in a int
+     */
+    public static int getUnsignedShort(ByteBuffer bb, int offset) {
+        return (bb.getShort(offset) & 0xffff);
+    }
+
+    /**
+     * Put an unsigned short into the specified ByteBuffer at the current
+     * position
+     *
+     * @param bb ByteBuffer to put the short into
+     * @param v the int containing the unsigned short
+     */
+    public static void putUnsignedShort(ByteBuffer bb, int v) {
+        bb.putShort((short) (v & 0xffff));
+    }
+
+    /**
+     * Put an unsigned short into the specified ByteBuffer at the specified
+     * offset
+     *
+     * @param bb ByteBuffer to put the short into
+     * @param v the int containing the unsigned short
+     * @param offset the offset to insert the unsigned short at
+     */
+    public static void putUnsignedShort(ByteBuffer bb, int v, int offset) {
+        bb.putShort(offset, (short) (v & 0xffff));
+    }
+
+    /**
+     * Get an unsigned int from the current position of the ByteBuffer
+     *
+     * @param bb ByteBuffer to get the int from
+     * @return an unsigned int contained in a long
+     */
+    public static long getUnsignedInt(ByteBuffer bb) {
+        return ((long) bb.getInt() & 0xffffffffL);
+    }
+
+    /**
+     * Get an unsigned int from the specified offset in the ByteBuffer
+     *
+     * @param bb ByteBuffer to get the int from
+     * @param offset the offset to get the int from
+     * @return an unsigned int contained in a long
+     */
+    public static long getUnsignedInt(ByteBuffer bb, int offset) {
+        return ((long) bb.getInt(offset) & 0xffffffffL);
+    }
+
+    /**
+     * Put an unsigned int into the specified ByteBuffer at the current position
+     *
+     * @param bb ByteBuffer to put the int into
+     * @param v the long containing the unsigned int
+     */
+    public static void putUnsignedInt(ByteBuffer bb, long v) {
+        bb.putInt((int) (v & 0xffffffffL));
+    }
+
+    /**
+     * Put an unsigned int into the specified ByteBuffer at the specified offset
+     *
+     * @param bb ByteBuffer to put the int into
+     * @param v the long containing the unsigned int
+     * @param offset the offset to insert the unsigned int at
+     */
+    public static void putUnsignedInt(ByteBuffer bb, long v, int offset) {
+        bb.putInt(offset, (int) (v & 0xffffffffL));
+    }
+
+    /**
+     * Get an unsigned long from the current position of the ByteBuffer
+     *
+     * @param bb ByteBuffer to get the long from
+     * @return an unsigned long contained in a BigInteger
+     */
+    public static BigInteger getUnsignedLong(ByteBuffer bb) {
+        byte[] v = new byte[8];
+        for (int i = 0; i < 8; ++i) {
+            v[i] = bb.get(i);
+        }
+        return new BigInteger(1, v);
+    }
+
+    /**
+     * Get an unsigned long from the specified offset in the ByteBuffer
+     *
+     * @param bb ByteBuffer to get the long from
+     * @param offset the offset to get the long from
+     * @return an unsigned long contained in a BigInteger
+     */
+    public static BigInteger getUnsignedLong(ByteBuffer bb, int offset) {
+        byte[] v = new byte[8];
+        for (int i = 0; i < 8; ++i) {
+            v[i] = bb.get(offset+i);
+        }
+        return new BigInteger(1, v);
+    }
+
+    /**
+     * Put an unsigned long into the specified ByteBuffer at the current
+     * position
+     *
+     * @param bb ByteBuffer to put the long into
+     * @param v the BigInteger containing the unsigned long
+     */
+    public static void putUnsignedLong(ByteBuffer bb, BigInteger v) {
+        bb.putLong(v.longValue());
+    }
+
+    /**
+     * Put an unsigned long into the specified ByteBuffer at the specified
+     * offset
+     *
+     * @param bb  ByteBuffer to put the long into
+     * @param v the BigInteger containing the unsigned long
+     * @param offset the offset to insert the unsigned long at
+     */
+    public static void putUnsignedLong(ByteBuffer bb, BigInteger v, int offset) {
+        bb.putLong(offset, v.longValue());
+    }
+}