/// <summary>
/// This method handles the initial validation of parameters for the HMAC genenaration process
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnCalcHmac_Click(object sender, EventArgs e)
{
//Validate that the following values are available:
//1) HMAC algorithm is selected
//2) File
//3) Key
if (cmbHmacAlgo.Text == "--Select--" || String.IsNullOrEmpty(txtFileToHmac.Text) || String.IsNullOrEmpty(txtHmacKey.Text))
{
MessageBox.Show("All the fields in RED must be selected!");
}
else
{
// If all goes well, pass the values to the CalculateHMAC function in hashvalidator.ClassLibraries.calculator class
// Too much input validation is intentionally avoided
ClassLibraries.calculator objCalc = new ClassLibraries.calculator();
string HMACResult = objCalc.CalculateHMAC(txtFileToHmac.Text, cmbHmacAlgo.Text, RANDOM_KEY_BYTES);
if (!String.IsNullOrEmpty(HMACResult) && !String.Equals(HMACResult, HMAC_ERROR))
{
txtHmacValue.Text = HMACResult;
}
else
{
MessageBox.Show(HMACResult);
}
}
}
private void btnValidateFileHmac_Click(object sender, EventArgs e)
{
//Validate that the following values are available:
//1) HMAC algorithm is selected
//2) File
//3) Key
if (cmbHmacAlgo.Text == "--Select--" || String.IsNullOrEmpty(txtFileToValidateHmac.Text) || String.IsNullOrEmpty(txtHmacKey.Text))
{
MessageBox.Show("All the fields in RED must be selected!");
}
else
{
//Convert the key to a byte array
byte[] _KEY_BYTES = new byte[0];
// If all goes well, pass the values to the CalculateHMAC function in hashvalidator.ClassLibraries.calculator class
// Too much input validation is intentionally avoided
ClassLibraries.calculator objCalc = new ClassLibraries.calculator();
string HMACResult = objCalc.CalculateHMAC(txtFileToValidateHmac.Text, cmbHmacAlgo.Text, _KEY_BYTES);
if (!String.IsNullOrEmpty(HMACResult) && !String.Equals(HMACResult, HMAC_ERROR))
{
txtHmacValidationResult.Text = HMACResult;
}
else
{
MessageBox.Show(HMACResult);
}
}
}
/// <summary>
/// Calculates the Hash value based on the selected algorithm and file
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnCalculateHash_Click(object sender, EventArgs e)
{
//Get the hash algorithm selected by the user
// if nothing selected show a message to select one
// Same for file to calculate the hash of
if (cbHashAlgorithms.Text == "--Select--")
{
MessageBox.Show("Select a hash algorithm");
}
else if (String.IsNullOrEmpty(FILE_TO_EVAL))
{
MessageBox.Show("Select a file to verify");
}
else
{
//Everything is validated, so lets create an object of the Calculator Class
ClassLibraries.calculator objCalculator = new ClassLibraries.calculator();
string[] returnedCalculation = objCalculator.CalculateHash(FILE_TO_EVAL, cbHashAlgorithms.Text.ToString());
if (string.Equals(returnedCalculation[0], "success"))
{
txtSimpleHashValue.Text = returnedCalculation[1];
//Enable the "Save to file" button
btnSaveHashToFile.Enabled = true;
}
else //This block executes when their is an error
{
MessageBox.Show(returnedCalculation[0]);
}
}
}
/// <summary>
/// This method handles the user event on clicking the "Generate key" checkbox.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void cbGenerateKey_CheckedChanged(object sender, EventArgs e)
{
if (txtHmacKey.Text != String.Empty && cbGenerateKey.Checked != true)
{
MessageBoxButtons choices = MessageBoxButtons.YesNo;
DialogResult userChoice = MessageBox.Show("Do you want to save the key?", "Please confirm?", choices);
if (userChoice == DialogResult.Yes)
{
try
{
string fileName;
//ToDo: Move all Save to file code to a seperate function
SaveFileDialog objSaveFile = new SaveFileDialog();
objSaveFile.Title = "Select a location to save the key";
objSaveFile.Filter = "Text files (*.txt)|*.txt|All files (*.*)|*.*";
objSaveFile.FileName = "KEY";
objSaveFile.InitialDirectory = @"C:\";
if (objSaveFile.ShowDialog() == DialogResult.OK)
{
fileName = objSaveFile.FileName;
File.WriteAllText(fileName, txtHmacKey.Text);
txtHmacKey.Text = "";
}
else
{
txtHmacKey.Text = "";
}
}
catch
{
MessageBox.Show("Error: Please try again!");
return;
}
}
else
{
txtHmacKey.Text = "";
}
}
if (cbGenerateKey.Checked == true && txtHmacKey.Text == String.Empty)
{
ClassLibraries.calculator objGenKey = new ClassLibraries.calculator();
RANDOM_KEY_BYTES = objGenKey.GenerateRandomKey();
if (RANDOM_KEY_BYTES != null)
{
txtHmacKey.Text = BitConverter.ToString(RANDOM_KEY_BYTES).Replace("-", String.Empty).ToLower();
}
else
{
MessageBox.Show(KEYGEN_ERROR_MSG);
}
}
}
/// <summary>
/// Start the hash calculation process. Triggers when the user clicks on
/// "Validate the file" button
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnCalculateHash_Click(object sender, EventArgs e)
{
//Get the hash algorithm selected by the user
// if nothing selected show a message to select one
// Same for file to calculate the hash of
if (cbHashAlgorithms.Text == "--Select--")
{
MessageBox.Show("Select a hash algorithm");
}
else if (String.IsNullOrEmpty(FILE_TO_EVAL))
{
MessageBox.Show("Select a file to verify");
}
else if (String.IsNullOrEmpty(txtHashValue.Text))
{
MessageBox.Show("Provide a pre-calculated hash to verify against");
}
else
{
//Everything is validated, so lets create an object of the Calculator Class
ClassLibraries.calculator objCalculator = new ClassLibraries.calculator();
string[] returnedCalculation = objCalculator.CalculateHash(FILE_TO_EVAL, cbHashAlgorithms.Text.ToString());
if (string.Equals(returnedCalculation[0], "success"))
{
//if (String.IsNullOrEmpty(txtHashValue.Text))
//{
// txtResults.Text = returnedCalculation[1];
//}
//else if (String.Equals(returnedCalculation[1], txtHashValue.Text))
if (String.Equals(returnedCalculation[1], txtHashValue.Text))
{
txtResults.BackColor = System.Drawing.Color.Green;
txtResults.Text = "Valid File!!!";
}
else
{
txtResults.BackColor = System.Drawing.Color.Red;
txtResults.Text = "Invalid File!!";
}
}
else //This block executes when their is an error
{
MessageBox.Show(returnedCalculation[1]);
}
}
}
/// <summary>
/// Start the hash calculation process. Triggers when the user clicks on
/// "Validate the file" button
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnCalculateHash_Click(object sender, EventArgs e)
{
//Get the hash algorithm selected by the user
// if nothing selected show a message to select one
// Same for file to calculate the hash of
if (cbHashAlgorithms.Text == "--Select--")
{
MessageBox.Show("Select a hash algorithm");
}
else if (String.IsNullOrEmpty(FILE_TO_EVAL))
{
MessageBox.Show("Select a file to verify");
}
else if (String.IsNullOrEmpty(txtHashValue.Text))
{
MessageBox.Show("Provide a pre-calculated hash to verify against");
}
else
{
//Everything is validated, so lets create an object of the Calculator Class
ClassLibraries.calculator objCalculator = new ClassLibraries.calculator();
string[] returnedCalculation = objCalculator.CalculateHash(FILE_TO_EVAL, cbHashAlgorithms.Text.ToString());
if (string.Equals(returnedCalculation[0], "success"))
{
//if (String.IsNullOrEmpty(txtHashValue.Text))
//{
// txtResults.Text = returnedCalculation[1];
//}
//else if (String.Equals(returnedCalculation[1], txtHashValue.Text))
if (String.Equals(returnedCalculation[1], txtHashValue.Text))
{
txtResults.BackColor = System.Drawing.Color.Green;
txtResults.Text = "Valid File!!!";
}
else
{
txtResults.BackColor = System.Drawing.Color.Red;
txtResults.Text = "Invalid File!!";
}
}
else //This block executes when their is an error
{
MessageBox.Show(returnedCalculation[1]);
}
}
}
/// <summary>
/// This method handles the user event on clicking the "Generate key" checkbox.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void cbGenerateKey_CheckedChanged(object sender, EventArgs e)
{
if (txtHmacKey.Text != String.Empty && cbGenerateKey.Checked != true)
{
MessageBoxButtons choices = MessageBoxButtons.YesNo;
DialogResult userChoice = MessageBox.Show("Do you want to save the key?", "Please confirm?", choices);
if (userChoice == DialogResult.Yes)
{
try
{
string fileName;
//ToDo: Move all Save to file code to a seperate function
SaveFileDialog objSaveFile = new SaveFileDialog();
objSaveFile.Title = "Select a location to save the key";
objSaveFile.Filter = "Text files (*.txt)|*.txt|All files (*.*)|*.*";
objSaveFile.FileName = "KEY";
objSaveFile.InitialDirectory = @"C:\";
if (objSaveFile.ShowDialog() == DialogResult.OK)
{
fileName = objSaveFile.FileName;
File.WriteAllText(fileName, txtHmacKey.Text);
txtHmacKey.Text = "";
}
else
{
txtHmacKey.Text = "";
}
}
catch
{
MessageBox.Show("Error: Please try again!");
return;
}
}
else
{
txtHmacKey.Text = "";
}
}
if (cbGenerateKey.Checked == true && txtHmacKey.Text == String.Empty)
{
ClassLibraries.calculator objGenKey = new ClassLibraries.calculator();
RANDOM_KEY_BYTES = objGenKey.GenerateRandomKey();
if (RANDOM_KEY_BYTES != null)
{
txtHmacKey.Text = BitConverter.ToString(RANDOM_KEY_BYTES).Replace("-", String.Empty).ToLower();
}
else
{
MessageBox.Show(KEYGEN_ERROR_MSG);
}
}
}
