SAML2\Assertion::addEncryptedAttributeStatement PHP Method

    private function addEncryptedAttributeStatement(\DOMElement $root)
    {
        if ($this->requiredEncAttributes == false) {
            return;
        }
        $document = $root->ownerDocument;
        $attributeStatement = $document->createElementNS(Constants::NS_SAML, 'saml:AttributeStatement');
        $root->appendChild($attributeStatement);
        foreach ($this->attributes as $name => $values) {
            $document2 = DOMDocumentFactory::create();
            $attribute = $document2->createElementNS(Constants::NS_SAML, 'saml:Attribute');
            $attribute->setAttribute('Name', $name);
            $document2->appendChild($attribute);
            if ($this->nameFormat !== Constants::NAMEFORMAT_UNSPECIFIED) {
                $attribute->setAttribute('NameFormat', $this->nameFormat);
            }
            foreach ($values as $value) {
                if (is_string($value)) {
                    $type = 'xs:string';
                } elseif (is_int($value)) {
                    $type = 'xs:integer';
                } else {
                    $type = null;
                }
                $attributeValue = $document2->createElementNS(Constants::NS_SAML, 'saml:AttributeValue');
                $attribute->appendChild($attributeValue);
                if ($type !== null) {
                    $attributeValue->setAttributeNS(Constants::NS_XSI, 'xsi:type', $type);
                }
                if ($value instanceof \DOMNodeList) {
                    for ($i = 0; $i < $value->length; $i++) {
                        $node = $document2->importNode($value->item($i), true);
                        $attributeValue->appendChild($node);
                    }
                } else {
                    $attributeValue->appendChild($document2->createTextNode($value));
                }
            }
            /*Once the attribute nodes are built, the are encrypted*/
            $EncAssert = new XMLSecEnc();
            $EncAssert->setNode($document2->documentElement);
            $EncAssert->type = 'http://www.w3.org/2001/04/xmlenc#Element';
            /*
             * Attributes are encrypted with a session key and this one with
             * $EncryptionKey
             */
            $symmetricKey = new XMLSecurityKey(XMLSecurityKey::AES256_CBC);
            $symmetricKey->generateSessionKey();
            $EncAssert->encryptKey($this->encryptionKey, $symmetricKey);
            $EncrNode = $EncAssert->encryptNode($symmetricKey);
            $EncAttribute = $document->createElementNS(Constants::NS_SAML, 'saml:EncryptedAttribute');
            $attributeStatement->appendChild($EncAttribute);
            $n = $document->importNode($EncrNode, true);
            $EncAttribute->appendChild($n);
        }
    }