diff --git a/pyof/utils.py b/pyof/utils.py
new file mode 100644
index 000000000..179e2c2cf
--- /dev/null
+++ b/pyof/utils.py
@@ -0,0 +1,50 @@
+"""General Unpack utils for python-openflow."""
+import pyof.v0x01.common.header
+import pyof.v0x01.common.utils
+import pyof.v0x04.common.header
+import pyof.v0x04.common.utils
+from pyof.foundation.exceptions import UnpackException
+
+pyof_version_libs = {0x01: pyof.v0x01,
+                     0x04: pyof.v0x04}
+
+
+def validate_packet(packet):
+    """Check if packet is valid OF packet."""
+    if not isinstance(packet, bytes):
+        raise UnpackException('invalid packet')
+
+    packet_length = len(packet)
+
+    if packet_length < 8 or packet_length > 2**16:
+        raise UnpackException('invalid packet')
+
+    if packet_length != int.from_bytes(packet[2:4],
+                                       byteorder='big'):
+        raise UnpackException('invalid packet')
+
+    version = packet[0]
+    if version == 0 or version >= 128:
+        raise UnpackException('invalid packet')
+
+
+def unpack(packet):
+    """Unpack the OpenFlow Packet and returns a message."""
+    validate_packet(packet)
+
+    version = packet[0]
+    try:
+        pyof_lib = pyof_version_libs[version]
+    except KeyError:
+        raise UnpackException('Version not supported')
+
+    try:
+        header = pyof_lib.common.header.Header()
+        header.unpack(packet[:8])
+        message = pyof_lib.common.utils.new_message_from_header(header)
+        binary_data = packet[8:]
+        if binary_data:
+            message.unpack(binary_data)
+        return message
+    except (UnpackException, ValueError) as e:
+        raise UnpackException(e)