TripleDESCryptoServiceProvider Constructor
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Initializes a new instance of the TripleDESCryptoServiceProvider class.
public:
TripleDESCryptoServiceProvider();public TripleDESCryptoServiceProvider ();Public Sub New ()Exceptions
The TripleDES cryptographic service provider is not available.
Examples
The following code example creates a TripleDESCryptoServiceProvider object and uses it to encrypt and decrypt data in a file.
using namespace System;
using namespace System::Security::Cryptography;
using namespace System::Text;
using namespace System::IO;
void EncryptTextToFile( String^ Data, String^ FileName, array<Byte>^Key, array<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 = gcnew CryptoStream( fStream,(gcnew TripleDESCryptoServiceProvider)->CreateEncryptor( Key, IV ),CryptoStreamMode::Write );
// Create a StreamWriter using the CryptoStream.
StreamWriter^ sWriter = gcnew 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 );
}
}
String^ DecryptTextFromFile( String^ FileName, array<Byte>^Key, array<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 = gcnew CryptoStream( fStream,(gcnew TripleDESCryptoServiceProvider)->CreateDecryptor( Key, IV ),CryptoStreamMode::Read );
// Create a StreamReader using the CryptoStream.
StreamReader^ sReader = gcnew 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 nullptr;
}
catch ( UnauthorizedAccessException^ e )
{
Console::WriteLine( "A file access error occurred: {0}", e->Message );
return nullptr;
}
}
int main()
{
try
{
// Create a new TripleDESCryptoServiceProvider object
// to generate a key and initialization vector (IV).
TripleDESCryptoServiceProvider^ tDESalg = gcnew 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 );
}
}
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;
}
}
}
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
The following code example creates a TripleDESCryptoServiceProvider object and uses it to encrypt and decrypt data in memory.
using namespace System;
using namespace System::Security::Cryptography;
using namespace System::Text;
using namespace System::IO;
array<Byte>^ EncryptTextToMemory( String^ Data, array<Byte>^Key, array<Byte>^IV )
{
try
{
// Create a MemoryStream.
MemoryStream^ mStream = gcnew MemoryStream;
// Create a CryptoStream using the MemoryStream
// and the passed key and initialization vector (IV).
CryptoStream^ cStream = gcnew CryptoStream( mStream,(gcnew TripleDESCryptoServiceProvider)->CreateEncryptor( Key, IV ),CryptoStreamMode::Write );
// Convert the passed string to a byte array.
array<Byte>^toEncrypt = (gcnew 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.
array<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 nullptr;
}
}
String^ DecryptTextFromMemory( array<Byte>^Data, array<Byte>^Key, array<Byte>^IV )
{
try
{
// Create a new MemoryStream using the passed
// array of encrypted data.
MemoryStream^ msDecrypt = gcnew MemoryStream( Data );
// Create a CryptoStream using the MemoryStream
// and the passed key and initialization vector (IV).
CryptoStream^ csDecrypt = gcnew CryptoStream( msDecrypt,(gcnew TripleDESCryptoServiceProvider)->CreateDecryptor( Key, IV ),CryptoStreamMode::Read );
// Create buffer to hold the decrypted data.
array<Byte>^fromEncrypt = gcnew array<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 (gcnew ASCIIEncoding)->GetString( fromEncrypt );
}
catch ( CryptographicException^ e )
{
Console::WriteLine( "A Cryptographic error occurred: {0}", e->Message );
return nullptr;
}
}
int main()
{
try
{
// Create a new TripleDESCryptoServiceProvider object
// to generate a key and initialization vector (IV).
TripleDESCryptoServiceProvider^ tDESalg = gcnew TripleDESCryptoServiceProvider;
// Create a string to encrypt.
String^ sData = "Here is some data to encrypt.";
// Encrypt the string to an in-memory buffer.
array<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 );
}
}
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;
}
}
}
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 - 1) 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
Applies to
See also
Collaborate with us on GitHub
The source for this content can be found on GitHub, where you can also create and review issues and pull requests. For more information, see our contributor guide.
