r= x^16 + x^14 - x^10 - x^8 - x^6 + x^2 + 1 q= ( x^34 - 2*x^32 + x^30 + x^4 + 2*x^2 + 1 ) / 4 P= x^17 - 2*x^16 + x^15 + x^2 + 2*x + 1 v= x^2