public void ExecuteDecrypt(object o)
{
if (Cipher != null)
{
if (IsBase64(Cipher))
{
try
{
byte[] cipherBytes = Convert.FromBase64String(Cipher);
byte[] masterKey = CryptoUtil.MasterKey;
string decryptedPassword = ASCIIEncoding.ASCII.GetString(CryptoUtil.AES_GCMDecrypt(cipherBytes, masterKey));
Password = decryptedPassword;
}
catch (Exception e)
{
Cipher = "The cipher was invalid";
Console.WriteLine(e);
}
}
else
{
Cipher = "Please enter a valid base64 string";
}
}
}
public VaultViewModel()
{
List <PasswordModel> dbPasswords = SQLiteDataAccess.LoadPasswords();
byte[] masterKey = CryptoUtil.MasterKey;
foreach (PasswordModel pass in dbPasswords)
{
byte[] passwordBytes = Convert.FromBase64String(pass.Password);
pass.Password = Encoding.ASCII.GetString(CryptoUtil.AES_GCMDecrypt(passwordBytes, masterKey));
}
Passwords = new BindableCollection <PasswordModel>(dbPasswords);
PassScreenType = new DisplayPasswordViewModel(null, this);
}
public static bool AuthenticateUser(UserModel userToLogin)
{
using (IDbConnection cnn = new SQLiteConnection(LoadConnectionString()))
{
var dbUser = cnn.Query <UserModel>("SELECT * FROM User WHERE Username = @Username", userToLogin).FirstOrDefault();
if (dbUser != null)
{
byte[] salt = Convert.FromBase64String(dbUser.Salt);
byte[] keyEncryptionKey = CryptoUtil.ComputePBKDF2Hash(userToLogin.Password, salt);
Console.WriteLine("Attempting authentication with key: " + Convert.ToBase64String(keyEncryptionKey));
// Attempts to decrypt the master key by deriving the key encryption key from the password input
try
{
byte[] decryptedMasterKey = CryptoUtil.AES_GCMDecrypt(Convert.FromBase64String(dbUser.Password), keyEncryptionKey);
Console.WriteLine($"Success! - Welcome {dbUser.Username}! =D");
Console.WriteLine($"Encrypted Master Key: {dbUser.Password}");
Console.WriteLine($"Decrypted Master Key: {Convert.ToBase64String(decryptedMasterKey)}");
CryptoUtil.MasterKey = decryptedMasterKey;
CurrentUser = dbUser;
return(true);
}
catch (InvalidCipherTextException e)
{
Console.WriteLine("Incorrect username or password! ;_;");
Console.WriteLine(e);
}
}
return(false);
}
}
