public string Decrypt(string cipherText)
{
char[] cipherArray = cipherText.ToCharArray();
int i = 0;
string decryptedCipher = "";
progressBar2.Maximum = cipherArray.Length;
try
{
for (; i < cipherArray.Length; i++)
{
Application.DoEvents();
string cipher = "";
progressBar2.Value = i;
int j;
for (j = i; cipherArray[j] != '-'; j++)
{
cipher += cipherArray[j];
}
i = j;
ulong cipherValue = Convert.ToUInt64(cipher);
decryptedCipher += ((char)RSAlgorithm.BigMod(cipherValue, d, n)).ToString();
}
}
catch (Exception) { }
return(decryptedCipher);
}
/// <summary>
/// Encrypt the selected text file, which is encoded using the unicode charset
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void BtnEncryptText_Click(object sender, EventArgs e)
{
n = RSAlgorithm.N(p, q);
BtnSelectImage.Enabled = false;
DisableUI();
//Get running time for encription
Stopwatch TimerForEncription = new Stopwatch();
TimerForEncription.Start();
String encrypted = Encrypt(stringFile, progressBarEnc);
TimerForEncription.Stop();
//End running time calculation
File.WriteAllText(txtSaveCipherAtPath.Text, encrypted);
MessageBox.Show("Encryption Done");
BtnSelectImage.Enabled = true;
BtnLoadImage.Enabled = true;
BtnSaveImageCipherAt.Enabled = true;
BtnDecryptImage.Enabled = true;
BtnSelectDecrytedImagePath.Enabled = true;
BtnLoadImageCipher.Enabled = true;
button10.Enabled = true;
BtnEncryptImage.Enabled = true;
GetRunningTime(TimerForEncription.ElapsedMilliseconds.ToString());
}
public string Encrypt(string image, ProgressBar progressBar)
{
string hexImage = image;
char[] hexImageArray = hexImage.ToCharArray();
string cipher = "";
progressBar.Maximum = hexImageArray.Length;
for (int i = 0; i < hexImageArray.Length; i++)
{
Application.DoEvents();
progressBar.Value = i;
//lblPercentage.Text = ((double)i / (double)progressBar.Maximum * 100).ToString();
int percent = (int)(((double)progressBar.Value / (double)progressBar.Maximum) * 100);
///progressBar.Refresh();
progressBar.CreateGraphics().DrawString(percent.ToString() + "%",
new Font("Arial", (float)8.25, FontStyle.Regular),
Brushes.Black,
new PointF(progressBar.Width / 2 - 10, progressBar.Height / 2 - 7));
if (cipher == "")
{
cipher += RSAlgorithm.BigMod(hexImageArray[i], e, n);
}
else
{
cipher += "-" + RSAlgorithm.BigMod(hexImageArray[i], e, n);
}
}
return(cipher);
}
private void BtnGetRSAElements_Click(object sender, EventArgs e)
{
//65537
var primes = RSACrypto.RSAHelper.GeneratePrimes(10000);
var result = RSACrypto.RSAHelper.GetTwoPrimes(primes);
string Prime1 = primes[(int)result[0]].ToString();
string Prime2 = primes[(int)result[1]].ToString();
var N = primes[(int)result[0]] * primes[(int)result[1]];
p = Convert.ToUInt64(primes[(int)result[0]]);
q = Convert.ToUInt64(primes[(int)result[1]]);
textBox2.Text = Prime1;
textBox3.Text = Prime2;
textBox8.Text = N.ToString();
//
//call the function for calculating e here
var phi = RSAlgorithm.Phi(p, q);
EDForm.e = RSAlgorithm.Find_E(phi);
bool flag = false;
for (ulong j = 1; !flag; j++)
{
if ((EDForm.e * j) % phi == 1)
{
d = j;
flag = true;
break;
}
}
//Set Public and Private Key
textBox4.Text = EDForm.e.ToString();
textBox9.Text = d.ToString();
if (MakerCheckerMessageMemoEdit.Text.Trim() == "")
{
MakerCheckerMessageMemoEdit.Text = "P=" + Prime1 + ", Q=" + Prime2 + ", N=" + N + System.Environment.NewLine + "Public Key=[" + EDForm.e.ToString() + "," + N + "]" + System.Environment.NewLine + "Private Key=[" + d.ToString() + ", " + N + "]";
}
else
{
MakerCheckerMessageMemoEdit.Text = MakerCheckerMessageMemoEdit.Text + System.Environment.NewLine + "_______________________________________________" + System.Environment.NewLine + "P=" + Prime1 + ", Q=" + Prime2 + ", N=" + N + System.Environment.NewLine + "Public Key=[" + EDForm.e.ToString() + "," + N + "]" + System.Environment.NewLine + "Private Key=[" + d.ToString() + ", " + N + "]";
}
//button3.Text = "Reset Details";
Application.DoEvents();
}
public string Encrypt(string image)
{
string hexImage = image;
char[] hexImageArray = hexImage.ToCharArray();
string cipher = "";
progressBar1.Maximum = hexImageArray.Length;
for (int i = 0; i < hexImageArray.Length; i++)
{
Application.DoEvents();
progressBar1.Value = i;
if (cipher == "")
{
cipher += RSAlgorithm.BigMod(hexImageArray[i], e, n);
}
else
{
cipher += "-" + RSAlgorithm.BigMod(hexImageArray[i], e, n);
}
}
return(cipher);
}
public static object[] PopulateKeys(ulong e, ulong d, ulong p, ulong q, params TextBox[] textBoxes)
{
var primes = GeneratePrimes(10000);
var result = GetTwoPrimes(primes);
string Prime1 = primes[(int)result[0]].ToString();
string Prime2 = primes[(int)result[1]].ToString();
var N = RSAlgorithm
.N((ulong)primes[result[0]], (ulong)primes[result[1]]);
p = Convert.ToUInt64(primes[result[0]]);
q = Convert.ToUInt64(primes[result[1]]);
textBoxes[0].Text = Prime1;
textBoxes[1].Text = Prime2;
textBoxes[2].Text = N.ToString();
var phi = RSAlgorithm.Phi(p, q);
e = RSAlgorithm.Find_E(phi);
bool flag = false;
for (ulong j = 1; !flag; j++)
{
if ((e * j) % phi == 1)
{
d = j;
flag = true;
}
}
textBoxes[3].Text = e.ToString();
textBoxes[4].Text = d.ToString();;
var returnValues = new object[] { p, q, N, e, d };
return(returnValues);
}
