private function rsa($public_or_private_key, $padding_mode)
{
if ($public_or_private_key instanceof JOSE_JWK) {
$rsa = $public_or_private_key->toKey();
} else {
if ($public_or_private_key instanceof RSA) {
$rsa = $public_or_private_key;
} else {
$rsa = new RSA();
$rsa->loadKey($public_or_private_key);
}
}
$rsa->setHash($this->digest());
$rsa->setMGFHash($this->digest());
$rsa->setSaltLength(false);
# NOTE: https://github.com/phpseclib/phpseclib/issues/768
$rsa->setSignatureMode($padding_mode);
return $rsa;
}