Implemented MD5 just like the SHA1 util

smack-core/src/main/java/org/jivesoftware/smack/util/ByteUtils.java

@@ -16,28 +16,7 @@
  */
 package org.jivesoftware.smack.util;
 
-import java.security.MessageDigest;
-import java.security.NoSuchAlgorithmException;
-
 public class ByteUtils {
-
-    private static MessageDigest md5Digest;
-
-    public synchronized static byte[] md5(byte[] data) {
-        if (md5Digest == null) {
-            try {
-                md5Digest = MessageDigest.getInstance(StringUtils.MD5);
-            }
-            catch (NoSuchAlgorithmException nsae) {
-                // Smack wont be able to function normally if this exception is thrown, wrap it into
-                // an ISE and make the user aware of the problem.
-                throw new IllegalStateException(nsae);
-            }
-        }
-        md5Digest.update(data);
-        return md5Digest.digest();
-    }
-
     public static byte[] concact(byte[] arrayOne, byte[] arrayTwo) {
         int combinedLength = arrayOne.length + arrayTwo.length;
         byte[] res = new byte[combinedLength];

smack-core/src/main/java/org/jivesoftware/smack/util/MD5.java

@@ -0,0 +1,56 @@
+/**
+ *
+ * Copyright © 2014 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smack.util;
+
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+
+public class MD5 {
+
+    /**
+     * Used by the hash method.
+     */
+    private static MessageDigest MD5_DIGEST;
+
+    static {
+        try {
+            MD5_DIGEST = MessageDigest.getInstance(StringUtils.MD5);
+        }
+        catch (NoSuchAlgorithmException e) {
+            // Smack wont be able to function normally if this exception is thrown, wrap it into
+            // an ISE and make the user aware of the problem.
+            throw new IllegalStateException(e);
+        }
+    }
+
+    public static synchronized byte[] bytes(byte[] bytes) {
+        return MD5_DIGEST.digest(bytes);
+    }
+
+    public static byte[] bytes(String string) {
+        return bytes(StringUtils.toBytes(string));
+    }
+
+    public static String hex(byte[] bytes) {
+        return StringUtils.encodeHex(bytes(bytes));
+    }
+
+    public static String hex(String string) {
+        return hex(StringUtils.toBytes(string));
+    }
+
+}