TripleDESCryptoServiceProvider Class
.NET Framework 2.0
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)
'Declaration <ComVisibleAttribute(True)> _ Public NotInheritable Class TripleDESCryptoServiceProvider Inherits TripleDES 'Usage Dim instance As TripleDESCryptoServiceProvider
/** @attribute ComVisibleAttribute(true) */ public final class TripleDESCryptoServiceProvider extends TripleDES
ComVisibleAttribute(true) public final class TripleDESCryptoServiceProvider extends TripleDES
The following code example creates a TripleDESCryptoServiceProvider object and uses it to encrypt and decrypt data in a file.
Imports System.Security.Cryptography Imports System.Text Imports System.IO Module TrippleDESCSPSample Sub Main() Try ' Create a new TripleDESCryptoServiceProvider object ' to generate a key and initialization vector (IV). Dim tDESalg As New TripleDESCryptoServiceProvider ' Create a string to encrypt. Dim sData As String = "Here is some data to encrypt." Dim FileName As String = "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. Dim Final As String = DecryptTextFromFile(FileName, tDESalg.Key, tDESalg.IV) ' Display the decrypted string to the console. Console.WriteLine(Final) Catch e As Exception Console.WriteLine(e.Message) End Try End Sub Sub EncryptTextToFile(ByVal Data As String, ByVal FileName As String, ByVal Key() As Byte, ByVal IV() As Byte) Try ' Create or open the specified file. Dim fStream As FileStream = File.Open(FileName, FileMode.OpenOrCreate) ' Create a CryptoStream using the FileStream ' and the passed key and initialization vector (IV). Dim cStream As New CryptoStream(fStream, _ New TripleDESCryptoServiceProvider().CreateEncryptor(Key, IV), _ CryptoStreamMode.Write) ' Create a StreamWriter using the CryptoStream. Dim sWriter As 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 e As CryptographicException Console.WriteLine("A Cryptographic error occurred: {0}", e.Message) Catch e As UnauthorizedAccessException Console.WriteLine("A file error occurred: {0}", e.Message) End Try End Sub Function DecryptTextFromFile(ByVal FileName As String, ByVal Key() As Byte, ByVal IV() As Byte) As String Try ' Create or open the specified file. Dim fStream As FileStream = File.Open(FileName, FileMode.OpenOrCreate) ' Create a CryptoStream using the FileStream ' and the passed key and initialization vector (IV). Dim cStream As New CryptoStream(fStream, _ New TripleDESCryptoServiceProvider().CreateDecryptor(Key, IV), _ CryptoStreamMode.Read) ' Create a StreamReader using the CryptoStream. Dim sReader As New StreamReader(cStream) ' Read the data from the stream ' to decrypt it. Dim val As String = sReader.ReadLine() ' Close the streams and ' close the file. sReader.Close() cStream.Close() fStream.Close() ' Return the string. Return val Catch e As CryptographicException Console.WriteLine("A Cryptographic error occurred: {0}", e.Message) Return Nothing Catch e As UnauthorizedAccessException Console.WriteLine("A file error occurred: {0}", e.Message) Return Nothing End Try End Function End Module
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.
Imports System.Security.Cryptography Imports System.Text Imports System.IO Module TrippleDESCSPSample Sub Main() Try ' Create a new TripleDESCryptoServiceProvider object ' to generate a key and initialization vector (IV). Dim tDESalg As New TripleDESCryptoServiceProvider ' Create a string to encrypt. Dim sData As String = "Here is some data to encrypt." ' Encrypt the string to an in-memory buffer. Dim Data As Byte() = EncryptTextToMemory(sData, tDESalg.Key, tDESalg.IV) ' Decrypt the buffer back to a string. Dim Final As String = DecryptTextFromMemory(Data, tDESalg.Key, tDESalg.IV) ' Display the decrypted string to the console. Console.WriteLine(Final) Catch e As Exception Console.WriteLine(e.Message) End Try End Sub Function EncryptTextToMemory(ByVal Data As String, ByVal Key() As Byte, ByVal IV() As Byte) As Byte() Try ' Create a MemoryStream. Dim mStream As New MemoryStream ' Create a CryptoStream using the MemoryStream ' and the passed key and initialization vector (IV). Dim cStream As New CryptoStream(mStream, _ New TripleDESCryptoServiceProvider().CreateEncryptor(Key, IV), _ CryptoStreamMode.Write) ' Convert the passed string to a byte array. Dim toEncrypt As Byte() = 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. Dim ret As Byte() = mStream.ToArray() ' Close the streams. cStream.Close() mStream.Close() ' Return the encrypted buffer. Return ret Catch e As CryptographicException Console.WriteLine("A Cryptographic error occurred: {0}", e.Message) Return Nothing End Try End Function Function DecryptTextFromMemory(ByVal Data() As Byte, ByVal Key() As Byte, ByVal IV() As Byte) As String Try ' Create a new MemoryStream using the passed ' array of encrypted data. Dim msDecrypt As New MemoryStream(Data) ' Create a CryptoStream using the MemoryStream ' and the passed key and initialization vector (IV). Dim csDecrypt As New CryptoStream(msDecrypt, _ New TripleDESCryptoServiceProvider().CreateDecryptor(Key, IV), _ CryptoStreamMode.Read) ' Create buffer to hold the decrypted data. Dim fromEncrypt(Data.Length) As Byte ' 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 e As CryptographicException Console.WriteLine("A Cryptographic error occurred: {0}", e.Message) Return Nothing End Try End Function End Module
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 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 .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.
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