private void IncrementSession()
{
if (cboKeys.SelectedIndex < 0)
{
return;
}
System.Configuration.Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
YubikeysSection keysSection = (YubikeysSection)config.GetSection("tokens");
YubikeySettings key = keysSection.Keys[((YubikeySettings)cboKeys.SelectedItem).Name];
++key.SessionCounter;
key.UseCounter = 0;
key.StartTime = DateTime.Now;
byte[] buffer = new byte[3];
RNGCryptoServiceProvider.Create().GetBytes(buffer);
key.TimeStamp = (((int)buffer[0]) << 16) | (((int)buffer[1]) << 8) | (int)buffer[2];
config.Save(ConfigurationSaveMode.Modified);
ConfigurationManager.RefreshSection("tokens");
int index = cboKeys.SelectedIndex;
YubikeysCollection keys = ((YubikeysCollection)cboKeys.DataSource);
keys[index] = key;
cboKeys.DataSource = keys;
}
private void btnCreateOTP_Click(object sender, EventArgs e)
{
if (cboKeys.SelectedIndex < 0)
{
return;
}
YubikeySettings key = ((YubikeysCollection)cboKeys.DataSource)[cboKeys.SelectedIndex];
string otp = OTPCreator.CreateOTP(key, this);
txtOTP.Text = otp;
Clipboard.SetData(DataFormats.StringFormat, otp);
}
void _enterOTPHandler_OnHotKeyEvent(object sender, EventArgs e)
{
if (cboKeys.SelectedIndex < 0)
{
return;
}
YubikeySettings key = ((YubikeysCollection)cboKeys.DataSource)[cboKeys.SelectedIndex];
string otp = OTPCreator.CreateOTP(key, this);
txtOTP.Text = otp;
SendKeys.SendWait(otp);
if (key.PressEnter)
{
SendKeys.Flush();
Thread.Sleep(_enterKeyDelay);
SendKeys.Send("{ENTER}");
}
}
public static string CreateOTP(YubikeySettings key, Form1 form)
{
string tokenID = ModHex.Encode(key.TokenID);
// Assemble key unencrypted data
byte[] keyBytes = new byte[16];
for (int i = 0; i < key.PrivateID.Length; ++i)
{
keyBytes[i] = key.PrivateID[i];
}
keyBytes[6] = (byte)(key.SessionCounter & 0xff);
keyBytes[7] = (byte)((key.SessionCounter >> 8) & 0xff);
form.SessionCounter = key.SessionCounter.ToString();
TimeSpan diff = DateTime.Now - key.StartTime;
int timer = (int)((((uint)(diff.TotalSeconds / TS_SEC) & 0x00FFFFFF) + key.TimeStamp) & 0x00FFFFFF);
form.Timestamp = timer.ToString();
keyBytes[8] = (byte)(timer & 0xff);
keyBytes[9] = (byte)((timer >> 8) & 0xff);
keyBytes[10] = (byte)((timer >> 16) & 0xff);
keyBytes[11] = key.UseCounter++;
form.UseCounter = keyBytes[11].ToString();
byte[] buffer = new byte[2];
RNGCryptoServiceProvider.Create().GetBytes(buffer);
form.Random = (((int)buffer[1] << 8) + (int)buffer[0]).ToString();
keyBytes[12] = buffer[0];
keyBytes[13] = buffer[1];
CRC(keyBytes);
using (Rijndael aes = Rijndael.Create())
{
aes.Padding = PaddingMode.None;
aes.Mode = CipherMode.ECB;
using (ICryptoTransform xform = aes.CreateEncryptor(key.Secret, new byte[16]))
{
byte[] plainBytes = new byte[16];
xform.TransformBlock(keyBytes, 0, keyBytes.Length, plainBytes, 0);
string otp = tokenID + ModHex.Encode(plainBytes);
return(otp);
}
}
}
bool AddKey(string name, byte[] secret, byte[] tokenID, byte[] privateID, int sessionCounter, bool pressEnter)
{
YubikeySettings key = new YubikeySettings();
key.Name = name;
key.Secret = secret;
key.TokenID = tokenID;
key.PrivateID = privateID;
key.SessionCounter = sessionCounter;
key.PressEnter = pressEnter;
YubikeysCollection keys = (YubikeysCollection)dataGridView1.DataSource;
if (keys.Contains(key))
{
return(false);
}
keys.Add(key);
dataGridView1.DataSource = null;
dataGridView1.Invalidate();
dataGridView1.DataSource = keys;
return(true);
}
private void PopulateKeyList()
{
System.Configuration.Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
YubikeysSection keysSection = (YubikeysSection)config.GetSection("tokens");
lock (cboKeys)
{
this.cboKeys.SelectedIndexChanged -= _indexChangedHandler;
this.cmcboKeys.SelectedIndexChanged -= _contextMenuIndexChangedHandler;
YubikeySettings selectedItem = (YubikeySettings)this.cboKeys.SelectedItem;
this.cboKeys.DataSource = null;
foreach (YubikeySettings key in keysSection.Keys)
{
key.StartTime = DateTime.Now;
}
this.cmcboKeys.Items.AddRange(keysSection.Keys.GetAll());
this.cboKeys.DataSource = keysSection.Keys;
this.cboKeys.ValueMember = "Name";
this.cboKeys.DisplayMember = "Name";
if (selectedItem == null)
{
this.cboKeys.SelectedIndex = -1;
this.cmcboKeys.SelectedIndex = -1;
}
else
{
int selectedIndex = keysSection.Keys.IndexOf(selectedItem);
this.cboKeys.SelectedIndex = selectedIndex;
this.cmcboKeys.SelectedIndex = selectedIndex;
}
this.cboKeys.SelectedIndexChanged += _indexChangedHandler;
this.cmcboKeys.SelectedIndexChanged += _contextMenuIndexChangedHandler;
}
IncrementSession();
}