private void ValidateInput(object sender, TextChangedEventArgs e)
{
errorText.Text = "";
buttonOK.IsEnabled = true;
BigInteger newMod, newR;
VectorND newPrivateKey;
try
{
newPrivateKey = Util.ConvertStringToVectorND(privateKey.Text);
}
catch (Exception)
{
errorText.Text = Languages.errorWrongVectorFormat;
buttonOK.IsEnabled = false;
return;
}
if (!MerkleHellmanModel.IsSuperincreasingSequence(newPrivateKey.values))
{
errorText.Text = Languages.errorPrivateKeyNotSuperincreasing;
buttonOK.IsEnabled = false;
return;
}
if (!BigInteger.TryParse(mod.Text, out newMod))
{
errorText.Text = Languages.errorOnlyIntegersAllowed;
buttonOK.IsEnabled = false;
return;
}
if (newMod < newPrivateKey.values.Aggregate <BigInteger, BigInteger>(0, (current, value) => current + value))
{
errorText.Text = Languages.errorModBiggerSum;
buttonOK.IsEnabled = false;
return;
}
if (!BigInteger.TryParse(r.Text, out newR))
{
errorText.Text = Languages.errorOnlyIntegersAllowed;
buttonOK.IsEnabled = false;
return;
}
if (MerkleHellmanModel.Euclid(newR, newMod) != 1)
{
errorText.Text = Languages.errorEuclidModR;
buttonOK.IsEnabled = false;
return;
}
if (cryptoGrid.Children.Cast <Control>().Any(control => control is TextBox && ((TextBox)control).Text.Equals("")))
{
errorText.Text = Languages.errorNoCryotosystemEntered;
buttonOK.IsEnabled = false;
return;
}
merkleHellman = new MerkleHellmanModel(newPrivateKey, newR, newMod);
}
public void SetCryptosystemManually(MerkleHellmanModel newMerkleHellman)
{
MerkleHellman = newMerkleHellman;
WriteHistoryForNewCryptosystem(Languages.buttonDefineNewCryptosystem);
NotifyPropertyChanged("MerkleHellman");
NotifyPropertyChanged("PrivateKey");
NotifyPropertyChanged("PublicKey");
NotifyPropertyChanged("Mod");
NotifyPropertyChanged("R");
NotifyPropertyChanged("RI");
}
public void GenerateNewMerkleHellman(int dim)
{
UiServices.SetBusyState();
MerkleHellman = new MerkleHellmanModel(dim);
WriteHistoryForNewCryptosystem(Languages.buttonGenerateNewLattice);
NotifyPropertyChanged("MerkleHellman");
NotifyPropertyChanged("PrivateKey");
NotifyPropertyChanged("PublicKey");
NotifyPropertyChanged("Mod");
NotifyPropertyChanged("R");
NotifyPropertyChanged("RI");
}
public void MerkleHellmanTest()
{
//Example taken from:
//http://en.wikipedia.org/wiki/Merkle%E2%80%93Hellman_knapsack_cryptosystem
VectorND privateKey = new VectorND(new BigInteger[] { 2, 7, 11, 21, 42, 89, 180, 354 });
MerkleHellmanModel merkleHellman = new MerkleHellmanModel(privateKey, 588, 881);
//Cryptosystem correct?
VectorND publicKey = new VectorND(new BigInteger[] { 295, 592, 301, 14, 28, 353, 120, 236 });
Assert.AreEqual(publicKey.ToString(), merkleHellman.publicKey.ToString());
BigInteger rI = 442;
Assert.AreEqual(rI, merkleHellman.rI);
//Encryption and decryption correct?
string message = "a";
VectorND cipher = merkleHellman.Encrypt(message);
VectorND expectedCipher = new VectorND(new BigInteger[] { 1129 });
Assert.AreEqual(cipher.ToString(), expectedCipher.ToString());
string decryptedMessage = merkleHellman.Decrypt(cipher);
Assert.AreEqual(message, decryptedMessage);
//Cryptoanalysis correct?
string cryptanalysedMessage = merkleHellman.Cryptanalysis(cipher, null);
Assert.AreEqual(message, cryptanalysedMessage);
//More Testing
for (int i = 0; i < 1000; i++)
{
message = GenerateMessage(1, 100);
cipher = merkleHellman.Encrypt(message);
decryptedMessage = merkleHellman.Decrypt(cipher);
Assert.AreEqual(message, decryptedMessage);
}
}
public MerkleHellmanViewManualInputView(MerkleHellmanModel currentMerkleHellman)
{
InitializeComponent();
merkleHellman = currentMerkleHellman;
InitGui();
}
