static function load($key, $password = '')
{
if (!is_string($key)) {
return false;
}
$components = array('isPublicKey' => false, 'primes' => array(), 'exponents' => array(), 'coefficients' => array());
$use_errors = libxml_use_internal_errors(true);
$dom = new \DOMDocument();
if (!$dom->loadXML('<xml>' . $key . '</xml>')) {
return false;
}
$xpath = new \DOMXPath($dom);
$keys = array('modulus', 'exponent', 'p', 'q', 'dp', 'dq', 'inverseq', 'd');
foreach ($keys as $key) {
// $dom->getElementsByTagName($key) is case-sensitive
$temp = $xpath->query("//*[translate(local-name(), 'ABCDEFGHIJKLMNOPQRSTUVWXYZ','abcdefghijklmnopqrstuvwxyz')='{$key}']");
if (!$temp->length) {
continue;
}
$value = new BigInteger(Base64::decode($temp->item(0)->nodeValue), 256);
switch ($key) {
case 'modulus':
$components['modulus'] = $value;
break;
case 'exponent':
$components['publicExponent'] = $value;
break;
case 'p':
$components['primes'][1] = $value;
break;
case 'q':
$components['primes'][2] = $value;
break;
case 'dp':
$components['exponents'][1] = $value;
break;
case 'dq':
$components['exponents'][2] = $value;
break;
case 'inverseq':
$components['coefficients'][2] = $value;
break;
case 'd':
$components['privateExponent'] = $value;
}
}
libxml_use_internal_errors($use_errors);
return isset($components['modulus']) && isset($components['publicExponent']) ? $components : false;
}
