public static Task <RSAAsymmetricKey> GetCryptoKeyAsync(CancellationToken cancelToken = default(CancellationToken))
{
return(Task.Run(() => {
RSAAsymmetricKey key = null;
if (KeyFile.Exists)
{
try {
using (var stream = File.OpenRead(KeyFile.FullName)) {
var reader = new StreamValueReader(stream);
RSAParameters parameters = RSAParametersSerializer.Deserialize(reader);
key = new RSAAsymmetricKey(parameters);
}
} catch (Exception ex) {
Trace.TraceWarning("Failed to read key: {0}", ex);
KeyFile.Delete();
}
}
cancelToken.ThrowIfCancellationRequested();
if (!KeyFile.Exists)
{
var rsa = new RSACrypto();
RSAParameters parameters = rsa.ExportKey(true);
key = new RSAAsymmetricKey(parameters);
cancelToken.ThrowIfCancellationRequested();
using (var stream = File.OpenWrite(KeyFile.FullName)) {
var writer = new StreamValueWriter(stream);
RSAParametersSerializer.Serialize(writer, parameters);
}
}
return key;
}, cancelToken));
}