/// <summary>
/// Encrypts or decrypts a string with the given key (rotor positions)
/// Unknown symbols are ignored (=retuned unchanged) and case is preserved.
/// </summary>
/// <param name="rotor1Pos">Position of rotor 1 (fastest)</param>
/// <param name="rotor2Pos">Position of rotor 2 (middle)</param>
/// <param name="rotor3Pos">Position of rotor 3 (slowest)</param>
/// <param name="rotor4Pos">Position of rotor 4 (extra rotor for M4)</param>
/// <param name="input">The text for en/decryption. All letters which are not in the alphabet are returned unprocessed.</param>
/// <returns>The encrypted/decrypted string</returns>
public string Encrypt(int rotor1Pos, int rotor2Pos, int rotor3Pos, int rotor4Pos, string input)
{
if (!Stopwatch.IsHighResolution)
{
logMessage("No high resolution timer available. Time measurements will be inaccurate!", NotificationLevel.Warning);
}
// Start the stopwatch
Stopwatch sw = Stopwatch.StartNew();
// set the current key, i.e. the rotor positions
iCfg.Rotor1pos = rotor1Pos;
iCfg.Rotor2pos = rotor2Pos;
iCfg.Rotor3pos = rotor3Pos;
iCfg.Rotor4pos = rotor4Pos;
// now perform the enigma operation for each character
char[] result = new char[input.Length];
for (int i = 0; i < input.Length; i++)
{
result[i] = enigmacrypt(input[i]);
//update the status, if we are not in anylzing mode
// this must be deactivated during analysis, since it takes a lot of time
if (settings.Action == 0 && !pluginFacade.Presentation.IsVisible)
{
pluginFacade.ShowProgress(i, input.Length);
}
}
// Stop the stopwatch
sw.Stop();
// Print some info on the console, if not in analyzing mode.
if (settings.Action == 0)
{
logMessage(String.Format("Enigma processing done! Processed {0} characters in {1} ms!", input.Length, sw.ElapsedMilliseconds), NotificationLevel.Info);
}
return(new string(result));
}
private const int maxAnalysisEntries = 10; // should go in settings under "Analysis Options"
#endregion
#region Private member methods
/// <summary>
/// This method basically brute-forces all possible rotors
/// </summary>
/// <param name="text">The ciphertext</param>
private void analyzeRotors(string text)
{
// Start the stopwatch
Stopwatch sw = Stopwatch.StartNew();
int trials = 0;
for (int i = 0; i < 8; i++)
{
//Rotor 3 (slowest)
if (!includeRotor(i))
{
continue;
}
settings.Rotor3 = i;
for (int j = 0; j < 8; j++)
{
// Rotor 2 (middle)
if (!includeRotor(j) || j == i)
{
continue;
}
settings.Rotor2 = j;
for (int k = 0; k < 8; k++)
{
// Rotor 1 (fastest)
if (!includeRotor(k) || k == i || k == j)
{
continue;
}
settings.Rotor1 = k;
//set the internal Config to the new rotors
core.setInternalConfig(k, j, i, 0, settings.Reflector,
settings.AnalyzeRings ? 1 : settings.Ring1,
settings.AnalyzeRings ? 1 : settings.Ring2,
settings.AnalyzeRings ? 1 : settings.Ring3,
settings.Ring4,
settings.AnalyzePlugs ? settings.Alphabet : settings.PlugBoard);
analyzeKeys(text);
trials++;
pluginFacade.ShowProgress(i * Math.Pow(8, 2) + j * 8 + k, Math.Pow(8, 3));
if (stop)
{
break;
}
} // Rotor 1
if (stop)
{
break;
}
} // Rotor 2
if (stop)
{
break;
}
} // Rotor 3
// Stop the stopwatch
sw.Stop();
string msg = String.Format("Processed {0} rotor permutations in {1}!",
trials, sw.Elapsed.ToString());
pluginFacade.LogMessage(msg, NotificationLevel.Info);
}
