public ISimpleCipheringAlgorithm NewAlgorithm(SimpleCiphers Cipher)
{
switch (Cipher)
{
case SimpleCiphers.Columns:
return(new ColumnarTransposition());
case SimpleCiphers.RailFence:
return(new RailFence());
case SimpleCiphers.Vigenere:
return(new Vigenere());
case SimpleCiphers.Grille:
return(new TurningGrille());
default:
return(new Vigenere());
}
}
private void Work()
{
IsNoActionRunning = false;
try
{
#region Checks
//Check whether file id is int
if (!int.TryParse(ChosenFileId, out int FileId))
{
IsCompleted = false;
StateText = "Wrong File id!";
return;
}
//Check whether file id is correct
if ((FileId >= FilesLoaded.Count()) || (FileId < 0))
{
IsCompleted = false;
StateText = "Wrong File id!";
return;
}
if (string.IsNullOrEmpty(ChosenAction))
{
return;
}
string FilePath = string.Empty;
//Load file path
foreach (var item in FilesLoaded)
{
if (item.Id == FileId)
{
FilePath = item.FileRealName;
break;
}
}
//if file id points to empty record
if (string.IsNullOrWhiteSpace(FilePath))
{
IsCompleted = false;
StateText = "File id is wrong.";
return;
}
// if file was deleted after loading
if (!File.Exists(FilePath))
{
IsCompleted = false;
StateText = "File doesnt exist.";
return;
}
#endregion
var AlphabetInCiphers = string.Empty;
//Get chosen Alphabet
if (ChosenAlphabet == AlphabetNamesList[0])
{
AlphabetInCiphers = ResourceStrings.EngCapital;
}
else
if (ChosenAlphabet == AlphabetNamesList[1])
{
AlphabetInCiphers = ResourceStrings.RuCapital;
}
var ChosenCipherType = new SimpleCiphers();
//Find Chosen Algorithm
for (int i = 0; i < CiphersList.Count(); ++i)
{
if (CiphersList[i] == ChosenCipher)
{
ChosenCipherType = (SimpleCiphers)i;
}
}
var Algorithm = new SimpleCipheringAlgorithmFactory().NewAlgorithm(ChosenCipherType);
Algorithm.Initialize(KeyValue, AlphabetInCiphers);
var chosenActionType = new Operations();
for (int i = 0; i < ActionsList.Count(); ++i)
{
if (ActionsList[i] == ChosenAction)
{
chosenActionType = (Operations)i;
}
}
var TextToWorkWith = File.ReadAllText(FilePath).ToUpper();
TextToWorkWith = GetFixedString(ref TextToWorkWith, AlphabetInCiphers, chosenActionType);
//Encrypt
if (chosenActionType == Operations.Encrypt)
{
ReturnedText = Algorithm.Encrypt(TextToWorkWith);
File.WriteAllText(FilePath.Insert(FilePath.IndexOf("."), "Encrypted"), ReturnedText);
StateText = "Successfully created text file " + Path.GetFileName(FilePath);
}
else//Decipher
{
ReturnedText = Algorithm.Decipher(TextToWorkWith);
File.WriteAllText(FilePath.Insert(FilePath.IndexOf("."), "Decrypted"), ReturnedText);
StateText = "Successfully created text file " + Path.GetFileName(FilePath);
}
IsCompleted = true;
}
catch (ArgumentException ex)
{
StateText = ex.Message;
IsCompleted = false;
}
finally
{ IsNoActionRunning = true; }
}