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<?php |
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declare(strict_types=1); |
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namespace Mdanter\Ecc\Crypto\Signature; |
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use Mdanter\Ecc\Math\GmpMathInterface; |
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use Mdanter\Ecc\Crypto\Key\PrivateKeyInterface; |
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use Mdanter\Ecc\Crypto\Key\PublicKeyInterface; |
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use Mdanter\Ecc\Util\BinaryString; |
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class Signer |
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{ |
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/** |
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* |
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* @var GmpMathInterface |
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*/ |
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private $adapter; |
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/** |
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* |
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* @param GmpMathInterface $adapter |
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*/ |
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public function __construct(GmpMathInterface $adapter) |
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{ |
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$this->adapter = $adapter; |
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} |
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/** |
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* @param PrivateKeyInterface $key |
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* @param \GMP $truncatedHash - hash truncated for use in ECDSA |
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* @param \GMP $randomK |
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* @return SignatureInterface |
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*/ |
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public function sign(PrivateKeyInterface $key, \GMP $truncatedHash, \GMP $randomK): SignatureInterface |
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{ |
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$math = $this->adapter; |
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$generator = $key->getPoint(); |
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$modMath = $math->getModularArithmetic($generator->getOrder()); |
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$k = $math->mod($randomK, $generator->getOrder()); |
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$p1 = $generator->mul($k); |
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$r = $p1->getX(); |
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$zero = gmp_init(0, 10); |
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if ($math->equals($r, $zero)) { |
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throw new \RuntimeException("Error: random number R = 0"); |
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} |
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$s = $modMath->div($modMath->add($truncatedHash, $math->mul($key->getSecret(), $r)), $k); |
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if ($math->equals($s, $zero)) { |
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throw new \RuntimeException("Error: random number S = 0"); |
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} |
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return new Signature($r, $s); |
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} |
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/** |
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* @param PublicKeyInterface $key |
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* @param SignatureInterface $signature |
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* @param \GMP $hash |
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* @return bool |
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*/ |
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public function verify(PublicKeyInterface $key, SignatureInterface $signature, \GMP $hash): bool |
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{ |
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$generator = $key->getGenerator(); |
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$n = $generator->getOrder(); |
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$r = $signature->getR(); |
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$s = $signature->getS(); |
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$math = $this->adapter; |
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$one = gmp_init(1, 10); |
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if ($math->cmp($r, $one) < 0 || $math->cmp($r, $math->sub($n, $one)) > 0) { |
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return false; |
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} |
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if ($math->cmp($s, $one) < 0 || $math->cmp($s, $math->sub($n, $one)) > 0) { |
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return false; |
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} |
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$modMath = $math->getModularArithmetic($n); |
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$c = $math->inverseMod($s, $n); |
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$u1 = $modMath->mul($hash, $c); |
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$u2 = $modMath->mul($r, $c); |
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$xy = $generator->mul($u1)->add($key->getPoint()->mul($u2)); |
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$v = $math->mod($xy->getX(), $n); |
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return BinaryString::constantTimeCompare($math->toString($v), $math->toString($r)); |
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} |
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} |
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shanecurran /
phpecc
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