{HEAD ~ a fixed MD5 nonlinear function processing unit} configured to perform a fixed nonlinear function on the B, {TAIL ~ C} and D register values, wherein the fixed MD5 nonlinear function processing unit implements only a single hardware implemented MD5 nonlinear function 
{ HEAD ~ a fixed MD5 nonlinear function processing unit } configured to perform a fixed nonlinear function on the B , { TAIL ~ C } and D register values , wherein the fixed MD5 nonlinear function processing unit implements only a single hardware implemented MD5 nonlinear function
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH