{TAIL ~ a second adder} configured to modulo add an output of {HEAD ~ the fixed MD5 nonlinear function processing unit} and the first adder 
{ TAIL ~ a second adder } configured to modulo add an output of { HEAD ~ the fixed MD5 nonlinear function processing unit } and the first adder
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH