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<?php |
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/* |
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* The MIT License (MIT) |
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* |
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* Copyright (c) 2014-2016 Spomky-Labs |
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* |
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* This software may be modified and distributed under the terms |
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* of the MIT license. See the LICENSE file for details. |
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*/ |
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namespace Jose\Algorithm\Signature; |
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use Assert\Assertion; |
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use Base64Url\Base64Url; |
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use Jose\Algorithm\SignatureAlgorithmInterface; |
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use Jose\Object\JWKInterface; |
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use Mdanter\Ecc\Crypto\Signature\Signature; |
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use Mdanter\Ecc\EccFactory; |
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use Mdanter\Ecc\Random\RandomGeneratorFactory; |
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/** |
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* Class ECDSA. |
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*/ |
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abstract class ECDSA implements SignatureAlgorithmInterface |
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{ |
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/** |
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* @var \Mdanter\Ecc\Math\MathAdapterInterface |
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*/ |
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private $adapter; |
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public function __construct() |
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{ |
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$this->adapter = EccFactory::getAdapter(); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function sign(JWKInterface $key, $data) |
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{ |
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$this->checkKey($key); |
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Assertion::true($key->has('d'), 'The EC key is not private'); |
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$p = $this->getGenerator(); |
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$d = $this->convertBase64ToDec($key->get('d')); |
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$hash = $this->convertHexToDec(hash($this->getHashAlgorithm(), $data)); |
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$k = RandomGeneratorFactory::getRandomGenerator()->generate($p->getOrder()); |
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$signer = EccFactory::getSigner(); |
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$private_key = $p->getPrivateKeyFrom($d); |
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$signature = $signer->sign($private_key, $hash, $k); |
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$part_length = $this->getSignaturePartLength(); |
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$R = str_pad($this->convertDecToHex($signature->getR()), $part_length, '0', STR_PAD_LEFT); |
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$S = str_pad($this->convertDecToHex($signature->getS()), $part_length, '0', STR_PAD_LEFT); |
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return $this->convertHexToBin($R.$S); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function verify(JWKInterface $key, $data, $signature) |
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{ |
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$this->checkKey($key); |
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$signature = $this->convertBinToHex($signature); |
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$part_length = $this->getSignaturePartLength(); |
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if (mb_strlen($signature, '8bit') !== 2 * $part_length) { |
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return false; |
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} |
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$p = $this->getGenerator(); |
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$x = $this->convertBase64ToDec($key->get('x')); |
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$y = $this->convertBase64ToDec($key->get('y')); |
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$R = $this->convertHexToDec(mb_substr($signature, 0, $part_length, '8bit')); |
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$S = $this->convertHexToDec(mb_substr($signature, $part_length, null, '8bit')); |
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$hash = $this->convertHexToDec(hash($this->getHashAlgorithm(), $data)); |
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$public_key = $p->getPublicKeyFrom($x, $y); |
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$signer = EccFactory::getSigner(); |
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return $signer->verify($public_key, new Signature($R, $S), $hash); |
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} |
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/** |
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* @return \Mdanter\Ecc\Primitives\GeneratorPoint |
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*/ |
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abstract protected function getGenerator(); |
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/** |
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* @return string |
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*/ |
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abstract protected function getHashAlgorithm(); |
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/** |
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* @return int |
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*/ |
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abstract protected function getSignaturePartLength(); |
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/** |
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* @param string $value |
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* |
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* @return string |
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*/ |
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private function convertHexToBin($value) |
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{ |
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return pack('H*', $value); |
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} |
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/** |
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* @param string $value |
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*/ |
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private function convertBinToHex($value) |
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{ |
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$value = unpack('H*', $value); |
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return $value[1]; |
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} |
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/** |
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* @param $value |
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* |
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* @return string |
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*/ |
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private function convertDecToHex($value) |
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{ |
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return $this->adapter->decHex($value); |
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} |
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/** |
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* @param $value |
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* |
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* @return int|string |
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*/ |
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private function convertHexToDec($value) |
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{ |
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return $this->adapter->hexDec($value); |
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} |
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/** |
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* @param $value |
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* |
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* @return int|string |
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*/ |
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private function convertBase64ToDec($value) |
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{ |
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$value = unpack('H*', Base64Url::decode($value)); |
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return $this->convertHexToDec($value[1]); |
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} |
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/** |
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* @param JWKInterface $key |
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*/ |
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private function checkKey(JWKInterface $key) |
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{ |
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Assertion::eq($key->get('kty'), 'EC', 'Wrong key type.'); |
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Assertion::true($key->has('x'), 'The key parameter "x" is missing.'); |
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Assertion::true($key->has('y'), 'The key parameter "y" is missing.'); |
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Assertion::true($key->has('crv'), 'The key parameter "crv" is missing.'); |
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} |
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} |
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Spomky-Labs /
jose
