protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
if (AppState.State.Instance.UserDetails == null)
{
var sharedPrefs = GetSharedPreferences("ChallengeApp", FileCreationMode.Private);
var userDetailsJson = sharedPrefs.GetString("userDetailsJson", null);
if (userDetailsJson == null)
{
StartActivity(typeof(TRegisterActivity));
Finish();
return;
}
AppState.State.Instance.UserDetails = JsonConvert.DeserializeObject <Model.UserDetails>(userDetailsJson);
var kc = new KeyChain.Net.XamarinAndroid.KeyChainHelper(() => this);
if (Guid.TryParse(kc.GetKey("deviceGuid"), out var guid))
{
AppState.State.Instance.DeviceGuid = guid;
}
else
{
StartActivity(typeof(TRegisterActivity));
Finish();
return;
}
}
SetupDb();
OnUserDetailsLoaded();
}
// Crypto
private string Sign(string data)
{
var kc = new KeyChain.Net.XamarinAndroid.KeyChainHelper(() => this);
var keyString = kc.GetKey("privateKey");
RsaPrivateCrtKeyParameters privateKey = (RsaPrivateCrtKeyParameters)PrivateKeyFactory.CreateKey(Convert.FromBase64String(keyString));
var signer = SignerUtilities.GetSigner("SHA256withRSA");
signer.Init(true, privateKey);
var bytes = Encoding.UTF8.GetBytes(data);
signer.BlockUpdate(bytes, 0, bytes.Length);
byte[] signature = signer.GenerateSignature();
var signedString = Convert.ToBase64String(signature);
return(signedString);
}