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<?php |
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declare(strict_types=1); |
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namespace SimpleSAML\XMLSecurity\XML; |
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use DOMElement; |
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use DOMNode; |
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use SimpleSAML\XMLSecurity\Alg\SignatureAlgorithm; |
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use SimpleSAML\XMLSecurity\Constants; |
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use SimpleSAML\XMLSecurity\Exception\RuntimeException; |
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use SimpleSAML\XMLSecurity\Utils\Security; |
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use SimpleSAML\XMLSecurity\Utils\XML; |
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use SimpleSAML\XMLSecurity\XML\ds\CanonicalizationMethod; |
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use SimpleSAML\XMLSecurity\XML\ds\DigestMethod; |
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use SimpleSAML\XMLSecurity\XML\ds\DigestValue; |
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use SimpleSAML\XMLSecurity\XML\ds\KeyInfo; |
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use SimpleSAML\XMLSecurity\XML\ds\Reference; |
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use SimpleSAML\XMLSecurity\XML\ds\Signature; |
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use SimpleSAML\XMLSecurity\XML\ds\SignatureMethod; |
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use SimpleSAML\XMLSecurity\XML\ds\SignatureValue; |
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use SimpleSAML\XMLSecurity\XML\ds\SignedInfo; |
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use SimpleSAML\XMLSecurity\XML\ds\Transform; |
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use SimpleSAML\XMLSecurity\XML\ds\Transforms; |
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use Webmozart\Assert\Assert; |
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/** |
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* Trait SignableElementTrait |
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* |
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* @package simplesamlphp/xml-security |
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*/ |
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trait SignableElementTrait |
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{ |
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/** @var \SimpleSAML\XMLSecurity\XML\ds\Signature|null */ |
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protected ?Signature $signature = null; |
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/** @var string */ |
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private string $c14nAlg = Constants::C14N_EXCLUSIVE_WITHOUT_COMMENTS; |
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/** @var KeyInfo|null */ |
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private ?KeyInfo $keyInfo = null; |
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/** @var \SimpleSAML\XMLSecurity\Alg\SignatureAlgorithm|null */ |
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private ?SignatureAlgorithm $signer = null; |
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/** |
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* @return string|null |
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*/ |
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abstract public function getId(): ?string; |
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/** |
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*/ |
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public function sign( |
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SignatureAlgorithm $signer, |
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string $canonicalizationAlg = Constants::C14N_EXCLUSIVE_WITHOUT_COMMENTS, |
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?KeyInfo $keyInfo = null |
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): void { |
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$this->signer = $signer; |
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$this->keyInfo = $keyInfo; |
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Assert::oneOf( |
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$canonicalizationAlg, |
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[ |
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Constants::C14N_INCLUSIVE_WITH_COMMENTS, |
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Constants::C14N_EXCLUSIVE_WITHOUT_COMMENTS, |
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Constants::C14N_EXCLUSIVE_WITH_COMMENTS, |
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Constants::C14N_EXCLUSIVE_WITHOUT_COMMENTS |
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], |
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'Unsupported canonicalization algorithm' |
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); |
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$this->c14nAlg = $canonicalizationAlg; |
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} |
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/** |
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* @param \DOMElement $xml |
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* @throws \Exception |
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*/ |
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private function doSign(DOMElement $xml): void |
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{ |
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if ($this->signer === null) { |
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throw new RuntimeException('Cannot call toSignedXML() without calling sign() first.'); |
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} |
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$algorithm = $this->signer->getAlgorithmId(); |
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$digest = $this->signer->getDigest(); |
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$transforms = new Transforms([ |
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new Transform(Constants::XMLDSIG_ENVELOPED), |
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new Transform($this->c14nAlg) |
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]); |
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$refId = $this->getId(); |
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$reference = new Reference( |
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new DigestMethod($digest), |
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new DigestValue(Security::hash($digest, XML::processTransforms($transforms, $xml))), |
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$transforms, |
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null, |
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null, |
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($refId !== null) ? '#' . $refId : null |
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); |
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$signedInfo = new SignedInfo( |
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new CanonicalizationMethod($this->c14nAlg), |
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new SignatureMethod($algorithm), |
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[$reference] |
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); |
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$signingData = XML::canonicalizeData($signedInfo->toXML(), $this->c14nAlg); |
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$signedData = base64_encode($this->signer->sign($signingData)); |
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$this->signature = new Signature($signedInfo, new SignatureValue($signedData), $this->keyInfo); |
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} |
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/** |
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* @param DOMElement $root |
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* @param DOMNode $node |
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* @param DOMElement $signature |
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* @return DOMElement |
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*/ |
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private function insertBefore(DOMElement $root, DOMNode $node, DOMElement $signature): DOMElement |
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{ |
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$root->removeChild($signature); |
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return $root->insertBefore($signature, $node); |
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} |
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} |
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simplesamlphp /
xml-security
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