public void SetLastLogin(String username, String password)
{
byte[] decrypted = BitConverter.GetBytes(IPAddress.NetworkToHostOrder((short)username.Length))
.Concat(System.Text.Encoding.UTF8.GetBytes(username))
.Concat(BitConverter.GetBytes(IPAddress.NetworkToHostOrder((short)password.Length)))
.Concat(System.Text.Encoding.UTF8.GetBytes(password)).ToArray();
PKCSKeyGenerator crypto = new PKCSKeyGenerator(LastLoginPassword, LastLoginSalt, 5, 1);
ICryptoTransform cryptoTransform = crypto.Encryptor;
byte[] encrypted = cryptoTransform.TransformFinalBlock(decrypted, 0, decrypted.Length);
if (File.Exists(lastLoginPath))
File.Delete(lastLoginPath);
using (Stream stream = File.Create(lastLoginPath))
stream.Write(encrypted, 0, encrypted.Length);
}
public String[] GetLastLogin()
{
try {
byte[] encryptedLogin = File.ReadAllBytes(lastLoginPath);
PKCSKeyGenerator crypto = new PKCSKeyGenerator(LastLoginPassword, LastLoginSalt, 5, 1);
ICryptoTransform cryptoTransform = crypto.Decryptor;
byte[] decrypted = cryptoTransform.TransformFinalBlock(encryptedLogin, 0, encryptedLogin.Length);
short userLength = IPAddress.HostToNetworkOrder(BitConverter.ToInt16(decrypted, 0));
byte[] user = decrypted.Skip(2).Take(userLength).ToArray();
short passLength = IPAddress.HostToNetworkOrder(BitConverter.ToInt16(decrypted, userLength + 2));
byte[] password = decrypted.Skip(4 + userLength).ToArray();
String[] result = new String[2];
result[0] = System.Text.Encoding.UTF8.GetString(user);
result[1] = System.Text.Encoding.UTF8.GetString(password);
return result;
}
catch (Exception e) {
MessageBox.Show(e.StackTrace);
return null;
}
}
public static LastLogin GetLastLogin()
{
try
{
byte[] encryptedLogin = File.ReadAllBytes(LastLoginFile);
PKCSKeyGenerator crypto = new PKCSKeyGenerator(LastLoginPassword, LastLoginSalt, 5, 1);
ICryptoTransform cryptoTransform = crypto.Decryptor;
byte[] decrypted = cryptoTransform.TransformFinalBlock(encryptedLogin, 0, encryptedLogin.Length);
short userLength = IPAddress.HostToNetworkOrder(BitConverter.ToInt16(decrypted, 0));
byte[] user = decrypted.Skip(2).Take(userLength).ToArray();
short passLength = IPAddress.HostToNetworkOrder(BitConverter.ToInt16(decrypted, userLength + 2));
byte[] password = decrypted.Skip(4 + userLength).ToArray();
LastLogin result = new LastLogin();
result.Username = System.Text.Encoding.UTF8.GetString(user);
result.Password = System.Text.Encoding.UTF8.GetString(password);
return result;
}
catch
{
return null;
}
}