in src/JWT.php [519:533]
private static function encodeDER($type, $value)
{
$tag_header = 0;
if ($type === self::$asn1Sequence) {
$tag_header |= 0x20;
}
// Type
$der = \chr($tag_header | $type);
// Length
$der .= \chr(\strlen($value));
return $der . $value;
}