3 files changed, 48 insertions, 3 deletions
diff --git a/src/Java/gtPlusPlus/core/util/Utils.java b/src/Java/gtPlusPlus/core/util/Utils.java
index effe0952f7..0909e4bf2d 100644
--- a/src/Java/gtPlusPlus/core/util/Utils.java
+++ b/src/Java/gtPlusPlus/core/util/Utils.java
@@ -2,9 +2,14 @@ package gtPlusPlus.core.util;
 
 import java.awt.Color;
 import java.awt.Graphics;
+import java.io.ByteArrayOutputStream;
 import java.io.File;
+import java.io.IOException;
+import java.io.ObjectOutput;
+import java.io.ObjectOutputStream;
 import java.lang.reflect.Field;
 import java.lang.reflect.Method;
+import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 import java.security.SecureRandom;
 import java.util.ArrayList;
@@ -15,6 +20,8 @@ import java.util.Map;
 import java.util.Timer;
 import java.util.TimerTask;
 
+import javax.xml.bind.DatatypeConverter;
+
 import org.apache.commons.lang3.EnumUtils;
 
 import cpw.mods.fml.common.FMLCommonHandler;
@@ -821,4 +828,38 @@ public class Utils {
 	}	
 	
 
+	public static String calculateChecksumMD5(Object bytes) {  
+		byte[] result = new byte[] {};
+		ByteArrayOutputStream bos = new ByteArrayOutputStream();
+		ObjectOutput out = null;
+		try {
+		  out = new ObjectOutputStream(bos);   
+		  out.writeObject(bytes);
+		  out.flush();
+		  result = bos.toByteArray();
+		}
+		catch (IOException e) {
+		} finally {
+		    try {
+				bos.close();
+			}
+			catch (IOException e) {}
+		}		
+		return calculateChecksumMD5(result);
+	}
+	
+	public static String calculateChecksumMD5(byte[] bytes) {        
+	    MessageDigest md;
+		try {
+			md = MessageDigest.getInstance("MD5");
+		    md.update(bytes);
+		    byte[] digest = md.digest();
+		    String myHash = DatatypeConverter.printHexBinary(digest).toUpperCase();
+		    return myHash;
+		}
+		catch (NoSuchAlgorithmException e) {
+			return null;
+		}
+	}
+
 }
diff --git a/src/Java/gtPlusPlus/core/util/array/Pair.java b/src/Java/gtPlusPlus/core/util/array/Pair.java
index ec5971c449..1d2c0ef7cb 100644
--- a/src/Java/gtPlusPlus/core/util/array/Pair.java
+++ b/src/Java/gtPlusPlus/core/util/array/Pair.java
@@ -1,7 +1,13 @@
 package gtPlusPlus.core.util.array;
 
-public class Pair<K,V> {
+import java.io.Serializable;
 
+public class Pair<K,V> implements Serializable {
+
+	/**
+	 * SVUID
+	 */
+	private static final long serialVersionUID = 1250550491092812443L;
 	private final K key;
 	private final V value;
 
diff --git a/src/Java/gtPlusPlus/core/util/item/ItemUtils.java b/src/Java/gtPlusPlus/core/util/item/ItemUtils.java
index 3d21a845bc..367539b49d 100644
--- a/src/Java/gtPlusPlus/core/util/item/ItemUtils.java
+++ b/src/Java/gtPlusPlus/core/util/item/ItemUtils.java
@@ -3,8 +3,6 @@ package gtPlusPlus.core.util.item;
 import java.util.ArrayList;
 import java.util.List;
 
-import org.apache.commons.lang3.reflect.FieldUtils;
-
 import cpw.mods.fml.common.registry.GameRegistry;
 import cpw.mods.fml.common.registry.GameRegistry.UniqueIdentifier;
 import gregtech.api.enums.Materials;