Простая программка на C# предназначенная для шифрования (дешифровки) файлов. Выполняет шифрование данных с помощью алгоритма RSA.
RSACryptoServiceProvider.Encrypt - метод выполняет шифрование данных с помощью алгоритма RSA.
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using System.Collections.Generic; using System.Text; using System.Threading.Tasks; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Imaging; using System.Windows.Navigation; using System.Windows.Shapes; using System.Security.Cryptography; using System.IO; namespace WpfApplication2 { public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); } const string EncrFolder = @"c:\Encrypt\"; const string DecrFolder = @"c:\Decrypt\"; const string SrcFolder = @"c:\docs\"; const string PubKeyFile = @"c:\encrypt\rsaPublicKey.txt"; // Key container name for private/public key value /пара ключей const string keyName = "Key01"; CspParameters cspp = new CspParameters(); //cspp.KeyContainerName = keyName; RSACryptoServiceProvider rsa; Microsoft.Win32.OpenFileDialog dlg = new Microsoft.Win32.OpenFileDialog(); Microsoft.Win32.OpenFileDialog openFileDialog2 = new Microsoft.Win32.OpenFileDialog(); private void Button_Click(object sender, RoutedEventArgs e) { dlg.DefaultExt = ".txt"; dlg.Filter = "Text documents (.txt)|*.txt"; // Display OpenFileDialog by calling ShowDialog method Nullable result = dlg.ShowDialog(); // Get the selected file name and display in a TextBox if (result == true) { // Open document string filename = dlg.FileName; textBox2.Text = filename;///////////////////////////////////// } } private void EncryptFile(string inFile) { // Create instance of Rijndael for // symetric encryption of the data. RijndaelManaged rjndl = new RijndaelManaged(); rjndl.KeySize = 256; rjndl.BlockSize = 256; rjndl.Mode = CipherMode.CBC; ICryptoTransform transform = rjndl.CreateEncryptor(); // Use RSACryptoServiceProvider to // enrypt the Rijndael key. // rsa is previously instantiated: // rsa = new RSACryptoServiceProvider(cspp); byte[] keyEncrypted = rsa.Encrypt(rjndl.Key, false); // Create byte arrays to contain // the length values of the key and IV. byte[] LenK = new byte[4]; byte[] LenIV = new byte[4]; int lKey = keyEncrypted.Length; LenK = BitConverter.GetBytes(lKey); int lIV = rjndl.IV.Length; LenIV = BitConverter.GetBytes(lIV); // Write the following to the FileStream // for the encrypted file (outFs): // - length of the key // - length of the IV // - ecrypted key // - the IV // - the encrypted cipher content int startFileName = inFile.LastIndexOf("\\") + 1; // Change the file's extension to ".enc" string outFile = EncrFolder + inFile.Substring(startFileName, inFile.LastIndexOf(".") - startFileName) + ".enc"; using (FileStream outFs = new FileStream(outFile, FileMode.Create)) { outFs.Write(LenK, 0, 4); outFs.Write(LenIV, 0, 4); outFs.Write(keyEncrypted, 0, lKey); outFs.Write(rjndl.IV, 0, lIV); // Now write the cipher text using // a CryptoStream for encrypting. using (CryptoStream outStreamEncrypted = new CryptoStream(outFs, transform, CryptoStreamMode.Write)) { // By encrypting a chunk at // a time, you can save memory // and accommodate large files. int count = 0; int offset = 0; // blockSizeBytes can be any arbitrary size. int blockSizeBytes = rjndl.BlockSize / 8; byte[] data = new byte[blockSizeBytes]; int bytesRead = 0; using (FileStream inFs = new FileStream(inFile, FileMode.Open)) { do { count = inFs.Read(data, 0, blockSizeBytes); offset += count; outStreamEncrypted.Write(data, 0, count); bytesRead += blockSizeBytes; } while (count > 0); inFs.Close(); } outStreamEncrypted.FlushFinalBlock(); outStreamEncrypted.Close(); } outFs.Close(); } } private void DecryptFile(string inFile) { // Создать экземпляр Rijndael для асимметричн расшифровки данных. RijndaelManaged rjndl = new RijndaelManaged(); rjndl.KeySize = 256; rjndl.BlockSize = 256; rjndl.Mode = CipherMode.CBC; // Create byte arrays to get the length of the encrypted key and IV. // These values were stored as 4 bytes each // at the beginning of the encrypted package. byte[] LenK = new byte[4]; byte[] LenIV = new byte[4]; // Consruct the file name for the decrypted file. string outFile = DecrFolder + inFile.Substring(0, inFile.LastIndexOf(".")) + ".txt"; // Use FileStream objects to read the encrypted // file (inFs) and save the decrypted file (outFs). using (FileStream inFs = new FileStream(EncrFolder + inFile, FileMode.Open)) { inFs.Seek(0, SeekOrigin.Begin); inFs.Seek(0, SeekOrigin.Begin); inFs.Read(LenK, 0, 3); inFs.Seek(4, SeekOrigin.Begin); inFs.Read(LenIV, 0, 3); // Convert the lengths to integer values. int lenK = BitConverter.ToInt32(LenK, 0); int lenIV = BitConverter.ToInt32(LenIV, 0); // Определить начальную postition в ciphter текста (startC) и его длины (lenC). int startC = lenK + lenIV + 8; int lenC = (int)inFs.Length - startC; // Create the byte arrays for // the encrypted Rijndael key, // the IV, and the cipher text. byte[] KeyEncrypted = new byte[lenK]; byte[] IV = new byte[lenIV]; // Извлечь ключ и IV, начиная с индекса 8 после значений длины. inFs.Seek(8, SeekOrigin.Begin); inFs.Read(KeyEncrypted, 0, lenK); inFs.Seek(8 + lenK, SeekOrigin.Begin); inFs.Read(IV, 0, lenIV); Directory.CreateDirectory(DecrFolder); // Use RSACryptoServiceProvider // to decrypt the Rijndael key. byte[] KeyDecrypted = rsa.Decrypt(KeyEncrypted, false); // Decrypt the key. ICryptoTransform transform = rjndl.CreateDecryptor(KeyDecrypted, IV); // Decrypt the cipher text from // from the FileSteam of the encrypted // file (inFs) into the FileStream // for the decrypted file (outFs). using (FileStream outFs = new FileStream(outFile, FileMode.Create)) { int count = 0; int offset = 0; // blockSizeBytes can be any arbitrary size. int blockSizeBytes = rjndl.BlockSize / 8; byte[] data = new byte[blockSizeBytes]; // By decrypting a chunk a time, // you can save memory and // accommodate large files. // Start at the beginning // of the cipher text. inFs.Seek(startC, SeekOrigin.Begin); using (CryptoStream outStreamDecrypted = new CryptoStream(outFs, transform, CryptoStreamMode.Write)) { do { count = inFs.Read(data, 0, blockSizeBytes); offset += count; outStreamDecrypted.Write(data, 0, count); } while (count > 0); outStreamDecrypted.FlushFinalBlock(); outStreamDecrypted.Close(); } outFs.Close(); } inFs.Close(); } } public static void GenKey_SaveInContainer(string keyName) { // Создание объекта в CspParameters и установка ключевого контейнера // Имя используется для хранения пары ключей RSA. CspParameters cp = new CspParameters(); cp.KeyContainerName = keyName; // Создание нового экземпляра RSACryptoServiceProvider, который обращается //к ключевому контейнеру MyKeyContainerName. RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(cp); // Метод ToXMLString возвращает информацию о ключе в формате XML. MessageBox.Show("Информация об открытом ключе в формате XML: \n " + rsa.ToXmlString(true)); } private void button1_Click(object sender, RoutedEventArgs e)//Create asim key { { cspp.KeyContainerName = keyName; rsa = new RSACryptoServiceProvider(cspp); rsa.PersistKeyInCsp = true; if (rsa.PublicOnly == true) this.textBox1.Text = "Key: " + cspp.KeyContainerName + " - Только Public key"; else this.textBox1.Text = "Key: " + cspp.KeyContainerName + " - Полная пара ключей создана. \nДля сохранения откр. ключа нажмите -ExportPublicKey-"; } } private void button2_Click(object sender, RoutedEventArgs e) { // Сохранить public key в файл. Directory.CreateDirectory(EncrFolder); StreamWriter sw = new StreamWriter(PubKeyFile, false); sw.Write(rsa.ToXmlString(false)); sw.Close(); this.textBox1.Text = "Public key сохранен в c:\\Encrypt\\.\n Нажмите -Encrypt- для выбора файла подлежащего шифрованию"; } private void button3_Click(object sender, RoutedEventArgs e) { StreamReader sr = new StreamReader(PubKeyFile); cspp.KeyContainerName = keyName; rsa = new RSACryptoServiceProvider(cspp); string keytxt = sr.ReadToEnd(); rsa.FromXmlString(keytxt); rsa.PersistKeyInCsp = true; if (rsa.PublicOnly == true) textBox1.Text = "Key: " + cspp.KeyContainerName + " - Public Only"; else textBox1.Text = "Key: " + cspp.KeyContainerName + " - Полная пара ключей"; sr.Close(); GenKey_SaveInContainer(keyName); } private void button4_Click(object sender, RoutedEventArgs e)//Encrypt { Directory.CreateDirectory(DecrFolder); if (rsa == null) MessageBox.Show("Key not set."); else { // Показ диалог выбора файла для шифровки. dlg.InitialDirectory = SrcFolder; if (dlg.ShowDialog() == true) { string fName = dlg.FileName; if (fName != null) { FileInfo fInfo = new FileInfo(fName); // Pass the file name without the path. string name = fInfo.FullName; EncryptFile(name); this.textBox2.Text = "Файл зашифрован и сохранен в c:\\Encrypt\\. \nСоздан каталог -Decrypt-. \nНажмите -Decrypt- для выбора файла(*.enc) подлежащего Расшифровке"; } } } } private void button5_Click(object sender, RoutedEventArgs e) { try { if (rsa == null) MessageBox.Show("Key not set. Жми -Create asim key-"); else { // Показ диалог выбора файла для расшифровки. openFileDialog2.InitialDirectory = EncrFolder; if (openFileDialog2.ShowDialog() == true) { string fName = openFileDialog2.FileName; if (fName != null) { FileInfo fi = new FileInfo(fName); string name = fi.Name; DecryptFile(name); string filename = dlg.FileName; this.textBox2.Text = "Расшифрованныый файл -" + filename + "- сохранен в c:\\Decrypt\\"; } } } } catch { MessageBox.Show("Key not set. Жми -Create asim key-"); } } private void Window_Loaded(object sender, RoutedEventArgs e) { this.textBox1.Text = "Создайте ключевую пару. Нажмите -Create asim key-"; } } } |
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