public static void DoDecrypt()
{
// Open the file.
if (FileName != null && FileName.Length >= 0)
{
fStream = new FileStream(FileName, FileMode.OpenOrCreate);
}
else
{
FileName = "Data.dat";
fStream = new FileStream("Data.dat", FileMode.Open);
}
FileInfo f = new FileInfo(FileName);
int bytesWritten = Convert.ToInt32(f.Length);
// Create some random entropy.
if (entropy == null)
{
entropy = EntropyGenerator.GetIP();
}
;
// Read from the stream and decrypt the data.
byte[] decryptData = DecryptDataFromStream(entropy, DataProtectionScope.LocalMachine, fStream, bytesWritten);
if (decryptData != null)
{
decryptedData = UnicodeEncoding.ASCII.GetString(decryptData);
}
else
{
decryptedData = null;
}
fStream.Close();
}
public static void DoEncrypt()
{
///////////////////////////////
//
// Data Encryption - ProtectedData
//
///////////////////////////////
// Create the original data to be encrypted
// byte[] toEncrypt = UnicodeEncoding.ASCII.GetBytes("This is some data of any length.");
byte[] toEncrypt = UnicodeEncoding.ASCII.GetBytes(encryptedData);
// Create a file.
if (FileName != null && FileName.Length == 0)
{
FileName = Environment.GetFolderPath(Environment.SpecialFolder.System) + @"\DataLicense.dat";
}
fStream = new FileStream(FileName, FileMode.OpenOrCreate);
// Create some random entropy.
if (entropy == null)
{
entropy = EntropyGenerator.GetIP();
}
// Encrypt a copy of the data to the stream.
int bytesWritten = EncryptDataToStream(toEncrypt, entropy, DataProtectionScope.LocalMachine, fStream);
fStream.Close();
}
public static string DoEncrypt(string dataToEncrypt, string FileNames, string _entropy)
{
if (string.IsNullOrWhiteSpace(_entropy))
{
_entropy = EntropyGenerator.GetIPForMachine();
}
if (string.IsNullOrWhiteSpace(FileNames))
{
FileName = Application.StartupPath + @"\Data.txt";
}
else
{
FileName = FileNames;
}
//Write to file
if (File.Exists(Application.StartupPath + @"\dataToEncrypt.txt"))
{
System.IO.File.Delete(Application.StartupPath + @"\dataToEncrypt.txt");
}
System.IO.File.WriteAllText(Application.StartupPath + @"\dataToEncrypt.txt", dataToEncrypt);
EncDec.Encrypt(Application.StartupPath + @"\dataToEncrypt.txt", FileName, _entropy);
System.IO.File.Delete(Application.StartupPath + @"\dataToEncrypt.txt");
//EncDec.Decrypt(@"C:\Users\224702\Desktop\Sample1.txt", @"C:\Users\224702\Desktop\Sample2.txt", @"127.0.0.1");
/*
* entropy = UnicodeEncoding.ASCII.GetBytes(_entropy.ToCharArray(), 0, 16);
* IV = UnicodeEncoding.ASCII.GetBytes(Reverse(_entropy).ToCharArray(), 0, 16);
*
* // Create a new instance of the Aes
* // class. This generates a new key and initialization
* // vector (IV).
* encryptedData = dataToEncrypt;
* FileName = FileNames;
*
* FileStream stream = new FileStream(FileName,
* FileMode.OpenOrCreate,FileAccess.Write);
*
* Aes cryptic = Aes.Create();
* //cryptic.Padding = PaddingMode.None;
* cryptic.Key = entropy;
* cryptic.IV = IV;
*
* // Create a decrytor to perform the stream transform.
* ICryptoTransform decryptor = cryptic.CreateEncryptor(entropy, IV);
*
* CryptoStream crStream = new CryptoStream(stream,
* decryptor, CryptoStreamMode.Write);
*
*
* byte[] data = ASCIIEncoding.ASCII.GetBytes(dataToEncrypt);
*
* crStream.Write(data,0,data.Length);
*
* crStream.Close();
* stream.Close();
*
*
* // Encrypt the string to an array of bytes.
* // byte[] encrypted = EncryptStringToBytes_Aes(dataToEncrypt,
* //entropy,IV);
*
* // string roundtrip = DecryptStringFromBytes_Aes(encrypted,
* //entropy, IV);
*
*
*
*
*
*
*
*
*
* //if(_entropy != null)
* // entropy = UnicodeEncoding.ASCII.GetBytes(_entropy);
* //DoEncrypt();*/
return(FileName);
}
public static void DoDecrypt(string FileNames, string _entropy)
{
if (string.IsNullOrWhiteSpace(_entropy))
{
_entropy = EntropyGenerator.GetIPForMachine();
}
/*if (_entropy != null)
* {
* _entropy = _entropy + "test this app for exam app";
* }
* else
* _entropy = EntropyGenerator.GetIPForMachine() + "test this app for exam app";
*
* entropy = UnicodeEncoding.ASCII.GetBytes(_entropy.ToCharArray(), 0, 16);
* IV = UnicodeEncoding.ASCII.GetBytes(Reverse(_entropy).ToCharArray(), 0, 16);
*/
decryptedData = null;
// Open the file.
if (string.IsNullOrWhiteSpace(FileNames))
{
FileName = Application.StartupPath + @"\Data.txt";
}
else
{
FileName = FileNames;
}
//if (FileName.EndsWith(".xml"))
//{
// EncDec.Decrypt(FileName, Application.StartupPath + @"\dataToDecrypt.xml", _entropy);
// decryptedData = System.IO.File.ReadAllText(Application.StartupPath + @"\dataToDecrypt.xml");
//}
//else
//{
if (File.Exists(Application.StartupPath + @"\dataToDecrypt.txt"))
{
System.IO.File.Delete(Application.StartupPath + @"\dataToDecrypt.txt");
}
try
{
EncDec.Decrypt(FileName, Application.StartupPath + @"\dataToDecrypt.txt", _entropy);
decryptedData = System.IO.File.ReadAllText(Application.StartupPath + @"\dataToDecrypt.txt");
System.IO.File.Delete(Application.StartupPath + @"\dataToDecrypt.txt");
}
catch (Exception ex)
{
LogEntry.WriteLog(ex, "Thread Exception");
}
//}
/*
* fStream = new FileStream("Data.dat", FileMode.Open);
* }
*
*
*
*
*
* Aes aesAlg = Aes.Create();
*
* aesAlg.Key = entropy;
* aesAlg.IV = IV;
* // aesAlg.Padding = PaddingMode.None;
* // Create a decrytor to perform the stream transform.
* ICryptoTransform encryptor = aesAlg.CreateDecryptor(entropy, IV);
* CryptoStream crStream = new CryptoStream(fStream,
* encryptor, CryptoStreamMode.Read);
*
* StreamReader reader = new StreamReader(crStream);
*
* decryptedData = reader.ReadToEnd();
*
* reader.Close();
* fStream.Close();
*
*
* /*CODE
* int bytesWritten = Convert.ToInt32(f.Length);
*
* byte[] inBuffer = new byte[bytesWritten];
*
*
* // Read the encrypted data from a stream.
* if (fStream.CanRead)
* {
* fStream.Read(inBuffer, 0, bytesWritten);
* }
*
* /* byte[] buffer = new byte[bytesWritten];
* using (MemoryStream ms = new MemoryStream())
* {
* int read;
* while ((read = fStream.Read(buffer, 0, buffer.Length)) > 0)
* {
* ms.Write(buffer, 0, read);
* }
*
*
*
* // Decrypt the bytes to a string.
* string roundtrip = DecryptStringFromBytes_Aes(inBuffer,
* entropy, IV); */
//}
/*if (_entropy != null)
* entropy = UnicodeEncoding.ASCII.GetBytes(_entropy);
* DoDecrypt();*/
}
