/**
* @param PublicKeyInterface $key
* @param SignatureInterface $signature
* @param $hash
* @return bool
*/
public function verify(PublicKeyInterface $key, SignatureInterface $signature, $hash)
{
$generator = $key->getGenerator();
$n = $generator->getOrder();
$point = $key->getPoint();
$r = $signature->getR();
$s = $signature->getS();
$math = $this->adapter;
if ($math->cmp($r, 1) < 1 || $math->cmp($r, $math->sub($n, 1)) > 0) {
return false;
}
if ($math->cmp($s, 1) < 1 || $math->cmp($s, $math->sub($n, 1)) > 0) {
return false;
}
$modMath = $math->getModularArithmetic($n);
$c = $math->inverseMod($s, $n);
$u1 = $modMath->mul($hash, $c);
$u2 = $modMath->mul($r, $c);
$xy = $generator->mul($u1)->add($point->mul($u2));
$v = $math->mod($xy->getX(), $n);
return $math->cmp($v, $r) == 0;
}
/**
* @param SignatureInterface $signature
* @return Sequence
*/
public function toAsn(SignatureInterface $signature)
{
return new Sequence(new Integer($signature->getR()), new Integer($signature->getS()));
}
public function serialize(SignatureInterface $signature, string $algorithm) : string
{
return pack('H*', sprintf('%s%s', $this->addPadding($signature->getR(), self::LENGTH[$algorithm]), $this->addPadding($signature->getS(), self::LENGTH[$algorithm])));
}
