private function getPrivateKey() : Key
{
return new Key("-----BEGIN EC PRIVATE KEY-----\n" . "MHcCAQEEIBGpMoZJ64MMSzuo5JbmXpf9V4qSWdLIl/8RmJLcfn/qoAoGCCqGSM49\n" . "AwEHoUQDQgAE7it/EKmcv9bfpcV1fBreLMRXxWpnd0wxa2iFruiI2tsEdGFTLTsy\n" . "U+GeRqC7zN0aTnTQajarUylKJ3UWr/r1kg==\n" . "-----END EC PRIVATE KEY-----");
}