code: def crack1(self, rnum, snum, message, signsecret):
          
          m = self.GFn.value(message)
          r = self.GFn.value(rnum)
          s = self.GFn.value(snum)
          k = self.GFn.value(signsecret)
          return (s * k - m) / r
docs: find privkey, given signsecret k, message m, signature (r,s)
          x= (s*k-m)/r