/// <summary>
/// Click handler for the 'ChangeAdminKey' button.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private async void ChangeAdminKey_Click(object sender, RoutedEventArgs e)
{
if (!rootPage.ValidateTPMSmartCard())
{
rootPage.NotifyUser(
"Use Scenario One to create a TPM virtual smart card.",
NotifyType.ErrorMessage);
return;
}
Button b = sender as Button;
b.IsEnabled = false;
try
{
IBuffer newadminkey = CryptographicBuffer.GenerateRandom(
MainPage.ADMIN_KEY_LENGTH_IN_BYTES);
SmartCard card = await rootPage.GetSmartCard();
SmartCardProvisioning provisioning =
await SmartCardProvisioning.FromSmartCardAsync(card);
rootPage.NotifyUser("Changing smart card admin key...",
NotifyType.StatusMessage);
using (SmartCardChallengeContext context =
await provisioning.GetChallengeContextAsync())
{
IBuffer response =
ChallengeResponseAlgorithm.CalculateResponse(
context.Challenge, rootPage.AdminKey);
await context.ChangeAdministrativeKeyAsync(response,
newadminkey);
rootPage.AdminKey = newadminkey;
}
rootPage.NotifyUser(
"Smart card change admin key operation completed.",
NotifyType.StatusMessage);
}
catch (Exception ex)
{
rootPage.NotifyUser(
"Changing smart card admin key operation failed " +
"with exception: " +
ex.ToString(),
NotifyType.ErrorMessage);
}
finally
{
b.IsEnabled = true;
}
}
/// <summary>
/// Click handler for the 'VerifyResponse' button.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private async void VerifyResponse_Click(object sender, RoutedEventArgs e)
{
if (!rootPage.ValidateTPMSmartCard())
{
rootPage.NotifyUser(
"Use Scenario One to create a TPM virtual smart card.",
NotifyType.ErrorMessage);
return;
}
Button b = sender as Button;
b.IsEnabled = false;
try
{
bool verifyResult = false;
SmartCard card = await rootPage.GetSmartCard();
SmartCardProvisioning provisioning =
await SmartCardProvisioning.FromSmartCardAsync(card);
rootPage.NotifyUser("Verifying smart card response...",
NotifyType.StatusMessage);
using (SmartCardChallengeContext context =
await provisioning.GetChallengeContextAsync())
{
IBuffer response = ChallengeResponseAlgorithm.CalculateResponse(
context.Challenge,
rootPage.AdminKey);
verifyResult = await context.VerifyResponseAsync(response);
}
rootPage.NotifyUser(
"Smart card response verification completed. Result: " +
verifyResult.ToString(),
NotifyType.StatusMessage);
}
catch (Exception ex)
{
rootPage.NotifyUser(
"Verifying smart card response operation failed " +
"with exception: " +
ex.ToString(),
NotifyType.ErrorMessage);
}
finally
{
b.IsEnabled = true;
}
}
