private async Task <string[]> GetCertificates()
{
var publicKeyTask = _digitalSigner.GetPublicKey();
var publicKeysChainTask = _digitalSigner.GetPublicKeyChain();
await Task.WhenAll(publicKeyTask, publicKeysChainTask);
var keys = new List <string> {
publicKeyTask.Result
};
keys.AddRange(publicKeysChainTask.Result);
return(keys.ToArray());
}