PHP XMLSecurityKey::getAlgorithm方法代码示例

 /**
  * Encrypt the selected node with the given key.
  *
  * @param XMLSecurityKey $objKey  The encryption key and algorithm.
  * @param bool $replace  Whether the encrypted node should be replaced in the original tree. Default is true.
  * @return DOMElement  The <xenc:EncryptedData>-element.
  */
 public function encryptNode($objKey, $replace = true)
 {
     $data = '';
     if (empty($this->rawNode)) {
         throw new Exception('Node to encrypt has not been set');
     }
     if (!$objKey instanceof XMLSecurityKey) {
         throw new Exception('Invalid Key');
     }
     $doc = $this->rawNode->ownerDocument;
     $xPath = new DOMXPath($this->encdoc);
     $objList = $xPath->query('/xenc:EncryptedData/xenc:CipherData/xenc:CipherValue');
     $cipherValue = $objList->item(0);
     if ($cipherValue == null) {
         throw new Exception('Error locating CipherValue element within template');
     }
     switch ($this->type) {
         case XMLSecEnc::Element:
             $data = $doc->saveXML($this->rawNode);
             $this->encdoc->documentElement->setAttribute('Type', XMLSecEnc::Element);
             break;
         case XMLSecEnc::Content:
             $children = $this->rawNode->childNodes;
             foreach ($children as $child) {
                 $data .= $doc->saveXML($child);
             }
             $this->encdoc->documentElement->setAttribute('Type', XMLSecEnc::Content);
             break;
         default:
             throw new Exception('Type is currently not supported');
     }
     $encMethod = $this->encdoc->documentElement->appendChild($this->encdoc->createElementNS(XMLSecEnc::XMLENCNS, 'xenc:EncryptionMethod'));
     $encMethod->setAttribute('Algorithm', $objKey->getAlgorithm());
     $cipherValue->parentNode->parentNode->insertBefore($encMethod, $cipherValue->parentNode->parentNode->firstChild);
     $strEncrypt = base64_encode($objKey->encryptData($data));
     $value = $this->encdoc->createTextNode($strEncrypt);
     $cipherValue->appendChild($value);
     if ($replace) {
         switch ($this->type) {
             case XMLSecEnc::Element:
                 if ($this->rawNode->nodeType == XML_DOCUMENT_NODE) {
                     return $this->encdoc;
                 }
                 $importEnc = $this->rawNode->ownerDocument->importNode($this->encdoc->documentElement, true);
                 $this->rawNode->parentNode->replaceChild($importEnc, $this->rawNode);
                 return $importEnc;
             case XMLSecEnc::Content:
                 $importEnc = $this->rawNode->ownerDocument->importNode($this->encdoc->documentElement, true);
                 while ($this->rawNode->firstChild) {
                     $this->rawNode->removeChild($this->rawNode->firstChild);
                 }
                 $this->rawNode->appendChild($importEnc);
                 return $importEnc;
         }
     } else {
         return $this->encdoc->documentElement;
     }
 }

 /**
  * Decrypts an encrypted element.
  *
  * @param DOMElement     $encryptedData The encrypted data.
  * @param XMLSecurityKey $inputKey      The decryption key.
  *
  * @return DOMElement  The decrypted element.
  *
  * @throws Exception
  */
 public static function decryptElement(DOMElement $encryptedData, XMLSecurityKey $inputKey)
 {
     $enc = new XMLSecEnc();
     $enc->setNode($encryptedData);
     $enc->type = $encryptedData->getAttribute("Type");
     $symmetricKey = $enc->locateKey($encryptedData);
     if (!$symmetricKey) {
         throw new Exception('Could not locate key algorithm in encrypted data.');
     }
     $symmetricKeyInfo = $enc->locateKeyInfo($symmetricKey);
     if (!$symmetricKeyInfo) {
         throw new Exception('Could not locate <dsig:KeyInfo> for the encrypted key.');
     }
     $inputKeyAlgo = $inputKey->getAlgorithm();
     if ($symmetricKeyInfo->isEncrypted) {
         $symKeyInfoAlgo = $symmetricKeyInfo->getAlgorithm();
         if ($symKeyInfoAlgo === XMLSecurityKey::RSA_OAEP_MGF1P && $inputKeyAlgo === XMLSecurityKey::RSA_1_5) {
             $inputKeyAlgo = XMLSecurityKey::RSA_OAEP_MGF1P;
         }
         if ($inputKeyAlgo !== $symKeyInfoAlgo) {
             throw new Exception('Algorithm mismatch between input key and key used to encrypt ' . ' the symmetric key for the message. Key was: ' . var_export($inputKeyAlgo, true) . '; message was: ' . var_export($symKeyInfoAlgo, true));
         }
         $encKey = $symmetricKeyInfo->encryptedCtx;
         $symmetricKeyInfo->key = $inputKey->key;
         $keySize = $symmetricKey->getSymmetricKeySize();
         if ($keySize === null) {
             // To protect against "key oracle" attacks
             throw new Exception('Unknown key size for encryption algorithm: ' . var_export($symmetricKey->type, true));
         }
         $key = $encKey->decryptKey($symmetricKeyInfo);
         if (strlen($key) != $keySize) {
             $encryptedKey = $encKey->getCipherValue();
             $pkey = openssl_pkey_get_details($symmetricKeyInfo->key);
             $pkey = sha1(serialize($pkey), true);
             $key = sha1($encryptedKey . $pkey, true);
             /* Make sure that the key has the correct length. */
             if (strlen($key) > $keySize) {
                 $key = substr($key, 0, $keySize);
             } elseif (strlen($key) < $keySize) {
                 $key = str_pad($key, $keySize);
             }
         }
         $symmetricKey->loadkey($key);
     } else {
         $symKeyAlgo = $symmetricKey->getAlgorithm();
         if ($inputKeyAlgo !== $symKeyAlgo) {
             throw new Exception('Algorithm mismatch between input key and key in message. ' . 'Key was: ' . var_export($inputKeyAlgo, true) . '; message was: ' . var_export($symKeyAlgo, true));
         }
         $symmetricKey = $inputKey;
     }
     $decrypted = $enc->decryptNode($symmetricKey, false);
     $xml = '<root xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">' . $decrypted . '</root>';
     $newDoc = new DOMDocument();
     $newDoc->preserveWhiteSpace = false;
     $newDoc->formatOutput = true;
     $newDoc = self::loadXML($newDoc, $xml);
     if (!$newDoc) {
         throw new Exception('Failed to parse decrypted XML.');
     }
     $decryptedElement = $newDoc->firstChild->firstChild;
     if ($decryptedElement === null) {
         throw new Exception('Missing encrypted element.');
     }
     return $decryptedElement;
 }