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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; |
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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\Behaviour\CommonSigningMethods; |
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use Jose\Behaviour\HasJWAManager; |
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use Jose\Behaviour\HasKeyChecker; |
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use Jose\Behaviour\HasLogger; |
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use Jose\Factory\AlgorithmManagerFactory; |
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use Jose\Object\JWKInterface; |
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use Jose\Object\JWSInterface; |
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use Jose\Object\Signature; |
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use Jose\Object\SignatureInterface; |
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use Psr\Log\LoggerInterface; |
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use Psr\Log\LogLevel; |
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final class Signer implements SignerInterface |
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{ |
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use HasKeyChecker; |
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use HasJWAManager; |
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use HasLogger; |
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use CommonSigningMethods; |
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/** |
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* Signer constructor. |
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* |
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* @param string[]|\Jose\Algorithm\SignatureAlgorithmInterface[] $signature_algorithms |
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*/ |
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public function __construct(array $signature_algorithms) |
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{ |
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$this->setSignatureAlgorithms($signature_algorithms); |
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$this->setJWAManager(AlgorithmManagerFactory::createAlgorithmManager($signature_algorithms)); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public static function createSigner(array $signature_algorithms, LoggerInterface $logger = null) |
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{ |
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$signer = new self($signature_algorithms); |
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if (null !== $logger) { |
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$signer->enableLogging($logger); |
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} |
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return $signer; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function sign(JWSInterface &$jws) |
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{ |
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$this->log(LogLevel::INFO, 'Trying to sign the JWS object', ['jws' => $jws]); |
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$nb_signatures = $jws->countSignatures(); |
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for ($i = 0; $i < $nb_signatures; $i++) { |
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$this->computeSignature($jws, $jws->getSignature($i)); |
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} |
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$this->log(LogLevel::INFO, 'JWS object signed!'); |
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} |
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/** |
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* @param \Jose\Object\JWSInterface $jws |
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* @param \Jose\Object\SignatureInterface $signature |
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*/ |
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private function computeSignature(JWSInterface $jws, SignatureInterface &$signature) |
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{ |
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$this->log(LogLevel::DEBUG, 'Creation of the signature'); |
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if (null === $signature->getSignatureKey()) { |
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$this->log(LogLevel::DEBUG, 'The signature key is not set. Aborting.'); |
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return; |
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} |
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$this->checkKeyUsage($signature->getSignatureKey(), 'signature'); |
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$signature_algorithm = $this->getSignatureAlgorithm($signature->getAllHeaders(), $signature->getSignatureKey()); |
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$this->log(LogLevel::DEBUG, 'Trying to compute the signature'); |
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$input = $this->getInputToSign($jws, $signature); |
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$value = $signature_algorithm->sign( |
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$signature->getSignatureKey(), |
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$input |
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); |
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$this->log(LogLevel::DEBUG, 'Signature computation done'); |
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$signature = Signature::createSignatureFromLoadedData( |
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$value, |
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$signature->getEncodedProtectedHeaders(), |
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$signature->getHeaders() |
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); |
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$this->log(LogLevel::DEBUG, 'The signature is done', ['signature' => $signature]); |
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} |
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/** |
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* @param \Jose\Object\JWSInterface $jws |
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* @param \Jose\Object\SignatureInterface $signature |
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* |
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* @return string |
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*/ |
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private function getInputToSign(JWSInterface $jws, SignatureInterface $signature) |
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{ |
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$encoded_protected_headers = $signature->getEncodedProtectedHeaders(); |
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$payload = $jws->getPayload(); |
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if (!$signature->hasProtectedHeader('b64') || true === $signature->getProtectedHeader('b64')) { |
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$encoded_payload = Base64Url::encode(is_string($payload) ? $payload : json_encode($payload)); |
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return sprintf('%s.%s', $encoded_protected_headers, $encoded_payload); |
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} |
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return sprintf('%s.%s', $encoded_protected_headers, $payload); |
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} |
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/** |
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* @param array $complete_header The complete header |
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* @param \Jose\Object\JWKInterface $key |
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* |
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* @return \Jose\Algorithm\SignatureAlgorithmInterface |
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*/ |
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private function getSignatureAlgorithm(array $complete_header, JWKInterface $key) |
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{ |
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$this->log(LogLevel::DEBUG, 'Trying to find the algorithm used to sign'); |
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Assertion::keyExists($complete_header, 'alg', 'No "alg" parameter set in the header.'); |
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$this->log(LogLevel::DEBUG, 'The algorithm is {alg}', ['alg' => $complete_header['alg']]); |
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Assertion::false( |
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$key->has('alg') && $key->get('alg') !== $complete_header['alg'], |
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sprintf('The algorithm "%s" is not allowed with this key.', $complete_header['alg']) |
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); |
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$signature_algorithm = $this->getJWAManager()->getAlgorithm($complete_header['alg']); |
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Assertion::isInstanceOf($signature_algorithm, SignatureAlgorithmInterface::class, sprintf('The algorithm "%s" is not supported.', $complete_header['alg'])); |
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$this->log(LogLevel::DEBUG, 'The algorithm {alg} is supported', ['alg' => $complete_header['alg'], 'handler' => $signature_algorithm]); |
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return $signature_algorithm; |
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} |
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} |
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Spomky-Labs /
jose
