{HEAD ~ a first adder} configured to modulo add the A register value and an MD5 pre adder value, wherein the MD5 pre adder value comprises the modulo sum of an MD5 message segment and {TAIL ~ an MD5 constant value} 
{ HEAD ~ a first adder } configured to modulo add the A register value and an MD5 pre adder value , wherein the MD5 pre adder value comprises the modulo sum of an MD5 message segment and { TAIL ~ an MD5 constant value }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD 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 OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL