public ECFieldElement multiply(final ECFieldElement b) {
// Right-to-left comb multiplication in the IntArray
// Input: Binary polynomials a(z) and b(z) of degree at most m-1
// Output: c(z) = a(z) * b(z) mod f(z)
// No check performed here for performance reasons. Instead the
// elements involved are checked in ECPoint.F2m
// checkFieldElements(this, b);
F2m bF2m = (F2m) b;
IntArray mult = x.multiply(bF2m.x, m);
mult.reduce(m, new int[] {k1, k2, k3});
return new F2m(m, k1, k2, k3, mult);
}
public ECFieldElement square() {
IntArray squared = x.square(m);
squared.reduce(m, new int[] {k1, k2, k3});
return new F2m(m, k1, k2, k3, squared);
}