Point addition method P + Q = R where:
s = (yP - yQ)/(xP - xQ) mod p
xR = s2 - xP - xQ mod p
yR = -yP + s(xP - xR) mod p
| public static pointAdd ( Bitpay\PointInterface $P, Bitpay\PointInterface $Q ) : Bitpay\PointInterface | ||
| $P | Bitpay\PointInterface | |
| $Q | Bitpay\PointInterface | |
| return | Bitpay\PointInterface | |
public function testPointAdd()
{
$point = Util::pointAdd(new Point(1, 1), new Point(1, 1));
$expectedpoint = new Point("28948022309329048855892746252171976963317496166410141009864396001977208667916", "14474011154664524427946373126085988481658748083205070504932198000988604333958");
$this->assertEquals($expectedpoint, $point);
$point = Util::pointAdd(new Point(0, 0), new Point(1, 1));
$expectedpoint = new Point("0", "0");
$this->assertEquals($expectedpoint, $point);
$point = Util::pointAdd(new Point(1, 0), new Point(0, 1));
$expectedpoint = new Point("0", "115792089237316195423570985008687907853269984665640564039457584007908834671662");
$this->assertEquals($expectedpoint, $point);
}
