/**
  * @param AssertionContext $context
  *
  * @return EncryptedAssertionReader
  */
 public static function getEncryptedAssertionReader(AssertionContext $context)
 {
     $result = $context->getEncryptedAssertion();
     if ($result instanceof EncryptedAssertionReader) {
         return $result;
     }
     throw new LightSamlContextException($context, 'Expected EncryptedAssertionReader');
 }