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<?php |
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namespace XmlSigner; |
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use XmlSigner\Exception\SignerException; |
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use XmlSigner\Validator\XmlValidator; |
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use DOMDocument; |
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use DOMNode; |
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class Signer |
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{ |
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const XMLDSIGNS = 'http://www.w3.org/2000/09/xmldsig#'; |
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const C14N = 'http://www.w3.org/TR/2001/REC-xml-c14n-20010315'; |
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const SHA1 = 'http://www.w3.org/2000/09/xmldsig#sha1'; |
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const SHA1_SIG = 'http://www.w3.org/2000/09/xmldsig#rsa-sha1'; |
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const SHA256 = 'http://www.w3.org/2001/04/xmlenc#sha256'; |
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const SHA256_SIG = 'http://www.w3.org/2001/04/xmldsig-more#rsa-sha256'; |
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private $algorithm; |
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private $canonical; |
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private $certificate; |
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public function __construct(Certificate $certificate) |
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{ |
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$this->certificate = $certificate; |
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} |
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public function xml( |
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$content, |
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$tagName, |
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$rootName = '', |
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$algorithm = OPENSSL_ALGO_SHA1, |
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$canonical = [true, false, null, null] |
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) { |
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$this->assertValidContent($content); |
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$this->algorithm = $algorithm; |
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$this->canonical = $canonical; |
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$dom = new DOMDocument('1.0', 'UTF-8'); |
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$dom->loadXML($content); |
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$dom->preserveWhiteSpace = false; |
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$dom->formatOutput = false; |
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$root = $dom->documentElement; |
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if (!empty($rootName)) { |
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$root = $dom->getElementsByTagName($rootName)->item(0); |
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} |
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$node = $dom->getElementsByTagName($tagName)->item(0); |
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if (empty($node) || empty($root)) { |
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throw SignerException::tagNotFound($tagName); |
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} |
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$dom = $this->createSignature( |
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$dom, |
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$root, |
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$node |
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); |
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return (string) '<?xml version="1.0" encoding="UTF-8"?>' |
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. $dom->saveXML($dom->documentElement, LIBXML_NOXMLDECL); |
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} |
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private function assertValidContent($content) |
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{ |
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if (!XmlValidator::valid($content)) { |
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throw SignerException::invalidContent(); |
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} |
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} |
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private function createSignature( |
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DOMDocument $dom, |
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DOMNode $root, |
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DOMNode $node |
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) { |
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$algorithmData = $this->algorithmData(); |
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$nsSignatureMethod = $algorithmData['nsSignatureMethod']; |
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$nsDigestMethod = $algorithmData['nsDigestMethod']; |
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$digestAlgorithm = $algorithmData['digestAlgorithm']; |
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$digestValue = $this->makeDigest($node, $digestAlgorithm); |
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$signatureNode = $dom->createElementNS(self::XMLDSIGNS, 'Signature'); |
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$root->appendChild($signatureNode); |
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$signedInfoNode = $dom->createElement('SignedInfo'); |
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$signatureNode->appendChild($signedInfoNode); |
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$canonicalNode = $dom->createElement('CanonicalizationMethod'); |
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$signedInfoNode->appendChild($canonicalNode); |
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$canonicalNode->setAttribute('Algorithm', self::C14N); |
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$signatureMethodNode = $dom->createElement('SignatureMethod'); |
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$signedInfoNode->appendChild($signatureMethodNode); |
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$signatureMethodNode->setAttribute('Algorithm', $nsSignatureMethod); |
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$referenceNode = $dom->createElement('Reference'); |
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$signedInfoNode->appendChild($referenceNode); |
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$transformsNode = $dom->createElement('Transforms'); |
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$referenceNode->appendChild($transformsNode); |
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$transfNode1 = $dom->createElement('Transform'); |
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$transformsNode->appendChild($transfNode1); |
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$transfNode1->setAttribute('Algorithm', self::XMLDSIGNS.'enveloped-signature'); |
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$transfNode2 = $dom->createElement('Transform'); |
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$transformsNode->appendChild($transfNode2); |
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$transfNode2->setAttribute('Algorithm', self::C14N); |
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$digestMethodNode = $dom->createElement('DigestMethod'); |
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$referenceNode->appendChild($digestMethodNode); |
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$digestMethodNode->setAttribute('Algorithm', $nsDigestMethod); |
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$digestValueNode = $dom->createElement('DigestValue', $digestValue); |
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$referenceNode->appendChild($digestValueNode); |
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$c14n = $this->canonize($signedInfoNode); |
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$signature = $this->certificate->sign($c14n, $this->algorithm); |
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$signatureValue = base64_encode($signature); |
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$signatureValueNode = $dom->createElement('SignatureValue', $signatureValue); |
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$signatureNode->appendChild($signatureValueNode); |
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$keyInfoNode = $dom->createElement('KeyInfo'); |
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$signatureNode->appendChild($keyInfoNode); |
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$x509DataNode = $dom->createElement('X509Data'); |
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$keyInfoNode->appendChild($x509DataNode); |
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$pubKeyClean = $this->certificate->publicKey(); |
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$x509CertificateNode = $dom->createElement('X509Certificate', $pubKeyClean); |
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$x509DataNode->appendChild($x509CertificateNode); |
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return $dom; |
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} |
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private function algorithmData() |
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{ |
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switch ($this->algorithm) { |
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case OPENSSL_ALGO_SHA256: |
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$digestAlgorithm = 'sha256'; |
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$nsSignatureMethod = self::SHA256_SIG; |
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$nsDigestMethod = self::SHA256; |
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break; |
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default: |
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$nsSignatureMethod = self::SHA1_SIG; |
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$nsDigestMethod = self::SHA1; |
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$digestAlgorithm = 'sha1'; |
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break; |
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} |
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return [ |
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'digestAlgorithm' => $digestAlgorithm, |
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'nsSignatureMethod' => $nsSignatureMethod, |
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'nsDigestMethod' => $nsDigestMethod |
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]; |
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} |
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/** |
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* Calculate digest value for given node |
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* @param DOMNode $node |
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* @param string $algorithm |
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* @return string |
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*/ |
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1 |
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private function makeDigest(DOMNode $node, $algorithm) |
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{ |
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$c14n = $this->canonize($node); |
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$hashValue = hash($algorithm, $c14n, true); |
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return base64_encode($hashValue); |
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} |
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/** |
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* Reduced to the canonical form |
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* @param DOMNode $node |
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* @return string |
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*/ |
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private function canonize(DOMNode $node) |
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{ |
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return $node->C14N( |
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$this->canonical[0], |
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$this->canonical[1], |
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$this->canonical[2], |
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$this->canonical[3] |
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); |
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} |
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} |
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martinusso /
xml-signer
