public void ElGamalEnc2()
{
ElGamal algorithm = new ElGamal();
List <long> cipher = algorithm.Encrypt(6323, 4736, 2231, 58, 111);//118
Assert.AreEqual(cipher[0], 6066);
Assert.AreEqual(cipher[1], 899);
}
public void ElGamalEnc1()
{
ElGamal algorithm = new ElGamal();
List <long> cipher = algorithm.Encrypt(7187, 4842, 4464, 19, 19);//191
Assert.AreEqual(cipher[0], 2781);
Assert.AreEqual(cipher[1], 437);
}
public byte[] EncryptSessionInfo(ReadOnlySpan <byte> sessionInfo)
{
var encryptedData = elGamal.Encrypt(sessionInfo, RSAEncryptionPadding.Pkcs1);
var g = encryptedData.Slice(0, encryptedData.Length / 2);
var p = encryptedData.Slice(encryptedData.Length / 2);
var mp = new byte[MPInteger.GetMPEncodedLength(g) + MPInteger.GetMPEncodedLength(p)];
MPInteger.TryWriteInteger(g, mp, out var gWritten);
MPInteger.TryWriteInteger(p, mp.AsSpan(gWritten), out var _);
return(mp);
}
public void Test_Elgamal_Encrypt_Simple()
{
// Arrange
var nonce = Constants.ONE_MOD_Q;
var secret = Constants.TWO_MOD_Q;
var keyPair = ElGamalKeyPair.FromSecret(secret);
var publicKey = keyPair.PublicKey;
var vote = 1UL;
// Act
var ciphertext = ElGamal.Encrypt(vote, nonce, publicKey);
var plaintext = ciphertext.Decrypt(keyPair.SecretKey);
// Assert
Assert.That(plaintext == vote);
}
/// <summary>
/// Encrypt the Master Key
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void encryptMasterKeyButton_Click(object sender, EventArgs e)
{
string message = this.masterKeyTextBox.Text;
if (String.IsNullOrWhiteSpace(message))
{
MessageBox.Show("A Master Key is Required", "Input Error", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
else if (message.Length < 3)
{
MessageBox.Show("The Master Key Must be at Least 3 Characters Long", "Input Error", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
else
{
try
{
string cipherText;
switch (this.AsymmetricSchemeToUse)
{
case AsymmetricScheme.RSA:
RSA rsa = new RSA(this.PrimalityTestToUse, this.SecurityToken);
cipherText = rsa.Encrypt(message, this.OtherUsersRSAPublicKey);
this.encryptedMasterKeyLabel.Text = cipherText;
break;
case AsymmetricScheme.ElGamal:
ElGamal elGamal = new ElGamal(this.PrimalityTestToUse, this.SecurityToken);
Tuple <BigInteger, BigInteger> cipherText2 = elGamal.Encrypt(message, this.OtherUsersElGamalPublicKey);
this.gammaLabel.Text = cipherText2.Item1.ToString();
this.deltaLabel.Text = cipherText2.Item2.ToString();
this.encryptedMasterKeyLabel.Text = "(" + cipherText2.Item1.ToString() + " / " + cipherText2.Item2.ToString() + ")";
break;
}
// Encrypt the Master Key
this.requestPublicKeyButton.Enabled = false;
this.encryptMasterKeyButton.Enabled = false;
this.decryptMasterKeyButton.Enabled = false;
this.sendMasterKeyButton.Enabled = true;
this.sendMasterKeyButton.Focus();
this.masterKeyLabel.Text = this.masterKeyTextBox.Text;
this.masterKeyTextBox.Visible = false;
this.masterKeyLabel.Visible = true;
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Input Error", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
}