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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 Jose\Algorithm\SignatureAlgorithmInterface; |
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use Jose\KeyConverter\RSAKey; |
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use Jose\Object\JWKInterface; |
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use phpseclib\Crypt\RSA as PHPSecLibRSA; |
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/** |
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* Class RSA. |
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*/ |
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abstract class RSA implements SignatureAlgorithmInterface |
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{ |
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/** |
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* Probabilistic Signature Scheme |
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*/ |
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const SIGNATURE_PSS = 1; |
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/** |
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* Use the PKCS#1 |
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*/ |
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const SIGNATURE_PKCS1 = 2; |
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/** |
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* @return mixed |
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*/ |
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abstract protected function getAlgorithm(); |
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/** |
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* @return mixed |
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*/ |
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abstract protected function getSignatureMethod(); |
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/** |
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* {@inheritdoc} |
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*/ |
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public function verify(JWKInterface $key, $input, $signature) |
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{ |
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$this->checkKey($key); |
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$pem = RSAKey::toPublic(new RSAKey($key))->toPEM(); |
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if ($this->getSignatureMethod() === self::SIGNATURE_PSS) { |
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$rsa = $this->getRsaObject(); |
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$rsa->loadKey($pem, PHPSecLibRSA::PRIVATE_FORMAT_PKCS1); |
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return $rsa->verify($input, $signature); |
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} else { |
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return 1 === openssl_verify($input, $signature, $pem, $this->getAlgorithm()); |
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} |
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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, $input) |
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{ |
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$this->checkKey($key); |
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Assertion::true($key->has('d'), 'The key is not a private key'); |
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$pem = (new RSAKey($key))->toPEM(); |
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if ($this->getSignatureMethod() === self::SIGNATURE_PSS) { |
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$rsa = $this->getRsaObject(); |
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$rsa->loadKey($pem, PHPSecLibRSA::PRIVATE_FORMAT_PKCS1); |
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$result = $rsa->sign($input); |
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Assertion::string($result, 'An error occurred during the creation of the signature'); |
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return $result; |
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} else { |
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$result = openssl_sign($input, $signature, $pem, $this->getAlgorithm()); |
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Assertion::true($result, 'Unable to sign'); |
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return $signature; |
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} |
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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'), 'RSA', 'Wrong key type.'); |
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} |
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/** |
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* @return \phpseclib\Crypt\RSA |
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*/ |
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private function getRsaObject() |
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{ |
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$rsa = new PHPSecLibRSA(); |
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$rsa->setHash($this->getAlgorithm()); |
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$rsa->setMGFHash($this->getAlgorithm()); |
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$rsa->setSaltLength(0); |
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$rsa->setSignatureMode(PHPSecLibRSA::SIGNATURE_PSS); |
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return $rsa; |
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} |
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} |
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Spomky-Labs /
jose
