// ----- KeyStore Interactions -----
public string CreateKey(string alias, string message)
{
if (keyStyle == "asymmetric")
{
var helper = new AsymmetricKeyHelper(alias); helper.CreateKey();
// If encrypted data is converted from byte[] to string, then back to byte[]
// it does not come back the same, will not decrypt
var encryptedData = helper.EncryptData(message);
return(helper.DecryptData(encryptedData));
}
else
{
var helper = new SymmetricKeyHelper(alias); helper.CreateKey();
// If encrypted data is converted from byte[] to string, then back to byte[]
// it does not come back the same, will not decrypt
var encryptedData = helper.EncryptDataToBytes(message);
return(helper.DecryptData(encryptedData));
}
}
// Show how to use Symm and Asymm Helpers (no longer very similar)
// Symm keys are in app-level SecureStorage now, Asymm keys are in os-level keystore
public void SetupKeyCreationTesting()
{
// Grab the buttons
var saveButton = FindViewById <Button>(Resource.Id.saveButton);
var getButton = FindViewById <Button>(Resource.Id.getButton);
var deleteButton = FindViewById <Button>(Resource.Id.deleteButton);
// Renamed, get all can feed into delete all if desired
var deleteAllButton = FindViewById <Button>(Resource.Id.deleteAllButton);
deleteAllButton.Text = "Get All";
// !!!
// Put private key in symm cipher => No output
// Put symm key in asymm cipher => Exception
var symmButton = FindViewById <RadioButton>(Resource.Id.SymmRadioButton);
var asymmButton = FindViewById <RadioButton>(Resource.Id.AsymmRadioButton);
// Janky add listeners to buttons
saveButton.Click += (o, e) =>
{
var key = FindViewById <EditText>(Resource.Id.storedKeyText).Text;
var data = FindViewById <EditText>(Resource.Id.storedMessageText).Text;
Print(CreateKey(key, data));
};
getButton.Click += (o, e) =>
{
var key = FindViewById <EditText>(Resource.Id.storedKeyText).Text;
var data = FindViewById <EditText>(Resource.Id.storedMessageText).Text;
if (keyStyle == "asymmetric")
{
var helper = new AsymmetricKeyHelper(key);
var encryptedData = helper.EncryptData(data);
Print(helper.DecryptData(encryptedData));
}
else
{
var helper = new SymmetricKeyHelper(key);
var encryptedData = helper.EncryptDataToBytes(data);
Print(helper.DecryptData(encryptedData));
}
};
deleteButton.Click += (o, e) =>
{
var key = FindViewById <EditText>(Resource.Id.storedKeyText).Text;
Print(DeleteKey(key).ToString());
};
deleteAllButton.Click += (o, e) =>
{
var keyAliases = GetAllKeys();
var output = "Key aliases: \n";
foreach (var alias in keyAliases)
{
output += alias + "\n";
}
Print(output);
};
symmButton.Click += (o, e) =>
{
keyStyle = "symmetric";
};
asymmButton.Click += (o, e) =>
{
keyStyle = "asymmetric";
};
// Grab the text inputs
var nameInput = FindViewById <EditText>(Resource.Id.storedKeyText);
var messageInput = FindViewById <EditText>(Resource.Id.storedMessageText);
// Set prompts
nameInput.Hint = "Key alias";
messageInput.Hint = "Message to be encrypted";
}