/**
* Create a ds:KeyInfo with RSA key vlue from given Key object
*
* @param DOMDocument $doc DOMDocument to add the KeyInfo
* @param Key $key Key
*
* @return DOMElement
*/
public static function createRSAKeyInfo(DOMDocument $doc, Key $key)
{
$keyDetails = $key->getDetails();
if (OPENSSL_KEYTYPE_RSA != $keyDetails['type']) {
throw InvalidArgumentException('key', 'Key type must be RSA.');
}
if (!isset($keyDetails['rsa']['n']) && !isset($keyDetails['rsa']['e'])) {
throw InvalidArgumentException('key', 'RSA key details must contain modulus and public exponent.');
}
$keyInfo = $doc->createElementNS(DSig::NS_XMLDSIG, DSig::PFX_XMLDSIG . ':KeyInfo');
$rsaKeyValue = $doc->createElementNS(DSig::NS_XMLDSIG, DSig::PFX_XMLDSIG . ':RSAKeyValue');
$keyInfo->appendChild($rsaKeyValue);
$modulusBase64 = base64_encode($keyDetails['rsa']['n']);
$modulus = $doc->createElementNS(DSig::NS_XMLDSIG, DSig::PFX_XMLDSIG . ':Modulus', $modulusBase64);
$rsaKeyValue->appendChild($modulus);
$exponentBase64 = base64_encode($keyDetails['rsa']['e']);
$exponent = $doc->createElementNS(DSig::NS_XMLDSIG, DSig::PFX_XMLDSIG . ':Exponent', $exponentBase64);
$rsaKeyValue->appendChild($exponent);
return $keyInfo;
}
