TripleDESCryptoServiceProvider Class
.NET Framework 3.0
Defines a wrapper object to access the cryptographic service provider (CSP) version of the TripleDES algorithm. This class cannot be inherited.
Namespace: System.Security.Cryptography
Assembly: mscorlib (in mscorlib.dll)
Assembly: mscorlib (in mscorlib.dll)
The following code example creates a TripleDESCryptoServiceProvider object and uses it to encrypt and decrypt data in a file.
using System; using System.Security.Cryptography; using System.Text; using System.IO; class TrippleDESCSPSample { static void Main() { try { // Create a new TripleDESCryptoServiceProvider object // to generate a key and initialization vector (IV). TripleDESCryptoServiceProvider tDESalg = new TripleDESCryptoServiceProvider(); // Create a string to encrypt. string sData = "Here is some data to encrypt."; string FileName = "CText.txt"; // Encrypt text to a file using the file name, key, and IV. EncryptTextToFile(sData, FileName, tDESalg.Key, tDESalg.IV); // Decrypt the text from a file using the file name, key, and IV. string Final = DecryptTextFromFile(FileName, tDESalg.Key, tDESalg.IV); // Display the decrypted string to the console. Console.WriteLine(Final); } catch (Exception e) { Console.WriteLine(e.Message); } } public static void EncryptTextToFile(String Data, String FileName, byte[] Key, byte[] IV) { try { // Create or open the specified file. FileStream fStream = File.Open(FileName,FileMode.OpenOrCreate); // Create a CryptoStream using the FileStream // and the passed key and initialization vector (IV). CryptoStream cStream = new CryptoStream(fStream, new TripleDESCryptoServiceProvider().CreateEncryptor(Key,IV), CryptoStreamMode.Write); // Create a StreamWriter using the CryptoStream. StreamWriter sWriter = new StreamWriter(cStream); // Write the data to the stream // to encrypt it. sWriter.WriteLine(Data); // Close the streams and // close the file. sWriter.Close(); cStream.Close(); fStream.Close(); } catch(CryptographicException e) { Console.WriteLine("A Cryptographic error occurred: {0}", e.Message); } catch(UnauthorizedAccessException e) { Console.WriteLine("A file access error occurred: {0}", e.Message); } } public static string DecryptTextFromFile(String FileName, byte[] Key, byte[] IV) { try { // Create or open the specified file. FileStream fStream = File.Open(FileName, FileMode.OpenOrCreate); // Create a CryptoStream using the FileStream // and the passed key and initialization vector (IV). CryptoStream cStream = new CryptoStream(fStream, new TripleDESCryptoServiceProvider().CreateDecryptor(Key,IV), CryptoStreamMode.Read); // Create a StreamReader using the CryptoStream. StreamReader sReader = new StreamReader(cStream); // Read the data from the stream // to decrypt it. string val = sReader.ReadLine(); // Close the streams and // close the file. sReader.Close(); cStream.Close(); fStream.Close(); // Return the string. return val; } catch(CryptographicException e) { Console.WriteLine("A Cryptographic error occurred: {0}", e.Message); return null; } catch(UnauthorizedAccessException e) { Console.WriteLine("A file access error occurred: {0}", e.Message); return null; } } }
import System.*;
import System.Security.Cryptography.*;
import System.Text.*;
import System.IO.*;
class TrippleDESCSPSample
{
public static void main(String[] args)
{
try {
// Create a new TripleDESCryptoServiceProvider object
// to generate a key and initialization vector (iv).
TripleDESCryptoServiceProvider tDESalg =
new TripleDESCryptoServiceProvider();
// Create a string to encrypt.
String sData = "Here is some data to encrypt.";
String fileName = "CText.txt";
// Encrypt text to a file using the file name, key, and iv.
EncryptTextToFile(sData, fileName, tDESalg.get_Key(),
tDESalg.get_IV());
// Decrypt the text from a file using the file name, key, and iv.
String strFinal = DecryptTextFromFile(fileName, tDESalg.get_Key(),
tDESalg.get_IV());
// Display the decrypted string to the console.
Console.WriteLine(strFinal);
}
catch (System.Exception e) {
Console.WriteLine(e.get_Message());
}
} //main
public static void EncryptTextToFile(String data, String fileName,
ubyte key[], ubyte iv[])
{
try {
// Create or open the specified file.
FileStream fStream = File.Open(fileName, FileMode.OpenOrCreate);
// Create a CryptoStream using the FileStream
// and the passed key and initialization vector (iv).
CryptoStream cStream = new CryptoStream(fStream,
(new TripleDESCryptoServiceProvider()).CreateEncryptor(key,
iv), CryptoStreamMode.Write);
// Create a StreamWriter using the CryptoStream.
StreamWriter sWriter = new StreamWriter(cStream);
// Write the data to the stream
// to encrypt it.
sWriter.WriteLine(data);
// Close the streams and
// close the file.
sWriter.Close();
cStream.Close();
fStream.Close();
}
catch (CryptographicException e) {
Console.WriteLine("A Cryptographic error occurred: {0}",
e.get_Message());
}
catch (UnauthorizedAccessException e) {
Console.WriteLine("A file access error occurred: {0}",
e.get_Message());
}
} //EncryptTextToFile
public static String DecryptTextFromFile(String fileName, ubyte key[],
ubyte iv[])
{
try {
// Create or open the specified file.
FileStream fStream = File.Open(fileName, FileMode.OpenOrCreate);
// Create a CryptoStream using the FileStream
// and the passed key and initialization vector (iv).
CryptoStream cStream = new CryptoStream(fStream,
(new TripleDESCryptoServiceProvider()).CreateDecryptor(key, iv),
CryptoStreamMode.Read);
// Create a StreamReader using the CryptoStream.
StreamReader sReader = new StreamReader(cStream);
// Read the data from the stream
// to decrypt it.
String val = sReader.ReadLine();
// Close the streams and
// close the file.
sReader.Close();
cStream.Close();
fStream.Close();
// Return the string.
return val;
}
catch (CryptographicException e) {
Console.WriteLine("A Cryptographic error occurred: {0}",
e.get_Message());
return null;
}
catch (UnauthorizedAccessException e) {
Console.WriteLine("A file access error occurred: {0}",
e.get_Message());
return null;
}
} //DecryptTextFromFile
} //TrippleDESCSPSample
The following code example creates a TripleDESCryptoServiceProvider object and uses it to encrypt and decrypt data in memory.
using System; using System.Security.Cryptography; using System.Text; using System.IO; class TrippleDESCSPSample { static void Main() { try { // Create a new TripleDESCryptoServiceProvider object // to generate a key and initialization vector (IV). TripleDESCryptoServiceProvider tDESalg = new TripleDESCryptoServiceProvider(); // Create a string to encrypt. string sData = "Here is some data to encrypt."; // Encrypt the string to an in-memory buffer. byte[] Data = EncryptTextToMemory(sData, tDESalg.Key, tDESalg.IV); // Decrypt the buffer back to a string. string Final = DecryptTextFromMemory(Data, tDESalg.Key, tDESalg.IV); // Display the decrypted string to the console. Console.WriteLine(Final); } catch (Exception e) { Console.WriteLine(e.Message); } } public static byte[] EncryptTextToMemory(string Data, byte[] Key, byte[] IV) { try { // Create a MemoryStream. MemoryStream mStream = new MemoryStream(); // Create a CryptoStream using the MemoryStream // and the passed key and initialization vector (IV). CryptoStream cStream = new CryptoStream(mStream, new TripleDESCryptoServiceProvider().CreateEncryptor(Key, IV), CryptoStreamMode.Write); // Convert the passed string to a byte array. byte[] toEncrypt = new ASCIIEncoding().GetBytes(Data); // Write the byte array to the crypto stream and flush it. cStream.Write(toEncrypt, 0, toEncrypt.Length); cStream.FlushFinalBlock(); // Get an array of bytes from the // MemoryStream that holds the // encrypted data. byte[] ret = mStream.ToArray(); // Close the streams. cStream.Close(); mStream.Close(); // Return the encrypted buffer. return ret; } catch(CryptographicException e) { Console.WriteLine("A Cryptographic error occurred: {0}", e.Message); return null; } } public static string DecryptTextFromMemory(byte[] Data, byte[] Key, byte[] IV) { try { // Create a new MemoryStream using the passed // array of encrypted data. MemoryStream msDecrypt = new MemoryStream(Data); // Create a CryptoStream using the MemoryStream // and the passed key and initialization vector (IV). CryptoStream csDecrypt = new CryptoStream(msDecrypt, new TripleDESCryptoServiceProvider().CreateDecryptor(Key, IV), CryptoStreamMode.Read); // Create buffer to hold the decrypted data. byte[] fromEncrypt = new byte[Data.Length]; // Read the decrypted data out of the crypto stream // and place it into the temporary buffer. csDecrypt.Read(fromEncrypt, 0, fromEncrypt.Length); //Convert the buffer into a string and return it. return new ASCIIEncoding().GetString(fromEncrypt); } catch(CryptographicException e) { Console.WriteLine("A Cryptographic error occurred: {0}", e.Message); return null; } } }
System.Object
System.Security.Cryptography.SymmetricAlgorithm
System.Security.Cryptography.TripleDES
System.Security.Cryptography.TripleDESCryptoServiceProvider
System.Security.Cryptography.SymmetricAlgorithm
System.Security.Cryptography.TripleDES
System.Security.Cryptography.TripleDESCryptoServiceProvider
Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.Community Additions
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