private async void WorkAsync()
{
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
#region Rabin
//Rabin
if (ChosenCipher == CiphersList[0])
{
BigInteger p = 0;
BigInteger q = 0;
//Encrypt
if (ChosenAction == ActionsList[0])
{
//Check everything strictly because we are waiting data from user
// and not generating it
if (!IsKeysAutoGenerating)
{
#region data parsing
if (!BigInteger.TryParse(SecretKeyParam1, out p))
{
StateText = "Wrong first secret key parameter .";
IsCompleted = false;
return;
}
if (!BigInteger.TryParse(SecretKeyParam2, out q))
{
StateText = "Wrong second secret key parameter .";
IsCompleted = false;
return;
}
if ((!p.CheckIfPrime()) || (!q.CheckIfPrime()))
{
StateText = "One of two numbers was not prime";
IsCompleted = false;
return;
}
if ((p % 4 != 3) || (q % 4 != 3))
{
StateText = "p and q mod 4 must be equal to 3.";
return;
}
if (p == q)
{
StateText = "Secret key values must differ.";
IsCompleted = false;
return;
}
#endregion
}
//if user've chosen to generate keys automatically, generate them now.
if (IsKeysAutoGenerating)
{
#region Key generation
p = RandomNumbersGenerator.GenerateBlumPrime(defaultKeyLength);
q = RandomNumbersGenerator.GenerateBlumPrime(defaultKeyLength);
if (p < 0)
{
p = -p;
}
if (q < 0)
{
q = -q;
}
CredentialsText = "p : " + p.ToString()
+ Environment.NewLine + "q: " + q.ToString()
+ Environment.NewLine + "Public key is: " +
(p * q).ToString();
#endregion
}
bool result = false;
result = RabinInstance.Initialize(p, q);
if (!result)
{
StateText = "Check key and try again.";
IsCompleted = false;
return;
}
await Task.Run(() => result = RabinInstance.Encrypt(p, q, FilePath));
if (!result)
{
StateText = "Check key and try again.";
IsCompleted = false;
return;
}
}
//Decrypt
else
{
#region data parsing
if (!BigInteger.TryParse(SecretKeyParam1, out p))
{
StateText = "Wrong first secret key parameter .";
IsCompleted = false;
return;
}
if (!BigInteger.TryParse(SecretKeyParam2, out q))
{
StateText = "Wrong second secret key parameter .";
IsCompleted = false;
return;
}
if ((p % 4 != 3) || (q % 4 != 3))
{
StateText = "p and q mod 4 must be equal to 3.";
return;
}
if (p == q)
{
StateText = "Secret key values must differ.";
IsCompleted = false;
return;
}
bool result = false;
result = RabinInstance.Initialize(p, q);
if (!result)
{
StateText = "Check key and try again.";
IsCompleted = false;
return;
}
#endregion
result = false;
await Task.Run(() => result = RabinInstance.Decrypt(p, q, FilePath));
if (!result)
{
StateText = "Check data you are decrypting and try again.";
IsCompleted = false;
return;
}
}
}
#endregion
#region Yarmolik - Rabin
//Yarmolik - Rabin
else if (ChosenCipher == CiphersList[1])
{
//Encrypt
if (ChosenAction == ActionsList[0])
{
if (!short.TryParse(PublicKeyParam1, out var publicKey))
{
#region Checks
// if public key was not provided, try parse private keys
if (!short.TryParse(SecretKeyParam1, out var p))
{
StateText = "Wrong first secret param.";
IsCompleted = false;
return;
}
if (!short.TryParse(SecretKeyParam2, out var q))
{
StateText = "Wrong second secret param.";
IsCompleted = false;
return;
}
if ((!p.CheckIfPrime()) || (!q.CheckIfPrime()))
{
StateText = "One of two numbers was not prime";
IsCompleted = false;
return;
}
if ((p % 4 != 3) || (q % 4 != 3))
{
StateText = "p and q mod 4 must be equal to 3.";
IsCompleted = false;
return;
}
if (p * q < Math.Pow(2, 8))
{
StateText = "p * q must be more than 1 byte.";
IsCompleted = false;
return;
}
if (!short.TryParse(PublicKeyParam2, out var caesarCoeff))
{
StateText = "Wrong caesar coefficient.";
IsCompleted = false;
return;
}
if (caesarCoeff >= p * q)
{
StateText = "Caesar coefficient must be less than public key.";
IsCompleted = false;
return;
}
if (p == q)
{
StateText = "Secret key values must differ.";
IsCompleted = false;
return;
}
#endregion
YarmolikRabinInstance.Encrypt(p, q, caesarCoeff, FilePath);
}
else
{ // if public key was provided
#region Checks
if (!short.TryParse(PublicKeyParam2, out var caesarCoeff))
{
StateText = "Wrong caesar coefficient.";
IsCompleted = false;
return;
}
if (caesarCoeff >= publicKey)
{
StateText = "Caesar coefficient must be less than public key.";
IsCompleted = false;
return;
}
if ((IsUnicodeSupported) && (publicKey < russianMaxUnicodeIndx))
{
StateText = $"To support unicode symbols, provide a public key larger than {russianMaxUnicodeIndx}";
IsCompleted = false;
return;
}
if (publicKey < Math.Pow(2, 8))
{
StateText = $"Public key should be more than 1 byte";
IsCompleted = false;
return;
}
#endregion
YarmolikRabinInstance.Encrypt(publicKey, caesarCoeff, FilePath);
}
}
//Decrypt
else
{
#region Checks
if (!short.TryParse(SecretKeyParam1, out var p))
{
StateText = "Wrong first secret param.";
IsCompleted = false;
return;
}
if (!short.TryParse(SecretKeyParam2, out var q))
{
StateText = "Wrong second secret param.";
IsCompleted = false;
return;
}
if ((!p.CheckIfPrime()) || (!q.CheckIfPrime()))
{
StateText = "One of two numbers was not prime";
IsCompleted = false;
return;
}
if ((p % 4 != 3) || (q % 4 != 3))
{
StateText = "p and q mod 4 must be equal to 3.";
IsCompleted = false;
return;
}
if (p * q < Math.Pow(2, 8))
{
StateText = "p * q must be more than 1 byte.";
IsCompleted = false;
return;
}
if (!short.TryParse(PublicKeyParam2, out var caesarCoeff))
{
StateText = "Wrong caesar coefficient.";
IsCompleted = false;
return;
}
if (caesarCoeff >= p * q)
{
StateText = "Caesar coefficient must be less than public key.";
IsCompleted = false;
return;
}
if (p == q)
{
StateText = "Secret key values must differ.";
IsCompleted = false;
return;
}
#endregion
await Task.Run(() => YarmolikRabinInstance.Decrypt(p, q, caesarCoeff, FilePath));
}
}
#endregion
StateText = "Action completed.";
IsCompleted = true;
}
catch (ArgumentException ex)
{
StateText = ex.Message;
IsCompleted = false;
}
catch (OutOfMemoryException)
{
StateText = "Memory limit was exceeded.";
IsCompleted = false;
}
finally
{ IsNoActionRunning = true; }
}
