Reversed Code for Win95 Product Key Check function from setupx.dll

95productKeyCheck.c

//Reverse Engineered by x64mayhem for educational purpose only. For use in related digital article.
undefined2 __stdcall16far PersonalProductKeyCheck(int param_1,undefined2 param_2)

{
  int iVar1;
  undefined2 unaff_SS;
  undefined2 uVar2;
  undefined local_6 [3];
  undefined local_3;
  
  uVar2 = 0x1140;
  PARTIAL_COPY(3,param_1 + 6,param_2,local_6,unaff_SS);
  local_3 = 0;
  iVar1 = ATOI(local_6);
  if ((((iVar1 == 333) || (iVar1 == 444)) || (iVar1 == 555)) ||
     (((iVar1 == 666 || (iVar1 == 777)) || ((iVar1 == 888 || (iVar1 == 999)))))) {
    uVar2 = 0;
  }
  else {
    uVar2 = MOD7check(param_1 + 10,param_2,uVar2);
  }
  return uVar2;
}