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 {TAIL ~ MD5 nonlinear function} 
implemented
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 { TAIL ~ MD5 nonlinear function }
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