/**
* Tries to parse the given file as a KeePass XML key file.
* @param string $filename The name of the file to parse.
* @return boolean Returns true in case of success, false otherwise.
*/
private function tryParseXML($filename)
{
$xml = new XMLStackReader();
if (!$xml->open($filename)) {
return false;
}
$parents = array(self::XML_ROOT, self::XML_KEY, self::XML_DATA);
if ($xml->readUntilParentsBe($parents)) {
if ($xml->isTextInside()) {
$this->hash = base64_decode($xml->r->value);
$xml->close();
return true;
}
}
$xml->close();
return false;
}
/**
* Tries to read the inner text of a XML node, assuming that the given
* XMLStackReader $xml is currently at this node, and that the only child
* of the node is a text node. Uses $this->randomStream to decode the
* text if needed.
* @param XMLStackReader $xml
* @return string|\null
*/
private function readTextValueFromXML(XMLStackReader $xml)
{
if ($xml->r->hasAttributes && $xml->r->moveToAttribute(self::XML_PROTECTED)) {
if ($xml->r->value == self::XML_PROTECTED_TRUE) {
$xml->r->moveToElement();
if ($xml->isTextInside()) {
$v = base64_decode($xml->r->value);
return $this->randomStream->dencrypt($v);
}
}
} elseif ($xml->isTextInside()) {
return $xml->r->value;
}
return null;
}