public boolean isValid() {
Element t0, t1;
if (infFlag != 0) return true;
t0 = field.getTargetField().newElement();
t1 = field.getTargetField().newElement();
t0.set(x).square().add(getField().getA()).mul(x).add(getField().getB());
t1.set(y).square();
return t0.isEqual(t1);
}
public boolean isAlmostCoddh(Element a, Element b, Element c, Element d) {
Element t0, t1;
t0 = pairing((Point) a, (Point) d);
t1 = pairing((Point) b, (Point) c);
if (t0.isEqual(t1)) {
return true;
} else {
t0.mul(t1);
return t0.isOne();
}
}