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