SymmetricCryptoStream Class

A PipeStream type which performs bidirectional Cryptographic transforms to all data passing through the stream.

For a list of all members of this type, see SymmetricCryptoStream members.

Inheritance Hierarchy

System.Object
   System.MarshalByRefObject
      System.IO.Stream
         Dart.PowerTCP.SslSockets.EnhancedStream
            Dart.PowerTCP.SslSockets.SymmetricCryptoStream

Syntax

[Visual Basic]
<LicenseProviderAttribute(SymmetricCryptoStreamLicenseProvider)>
Public Class SymmetricCryptoStream 
   Inherits EnhancedStream

[C#]
[LicenseProviderAttribute(SymmetricCryptoStreamLicenseProvider)]
public class SymmetricCryptoStream : EnhancedStream

[C++]
[LicenseProviderAttribute(SymmetricCryptoStreamLicenseProvider)]
public __gc class SymmetricCryptoStream : public EnhancedStream

[C++/CLI]
[LicenseProviderAttribute(SymmetricCryptoStreamLicenseProvider)]
public ref class SymmetricCryptoStream : public EnhancedStream

Remarks

This class is useful for providing Private-key encryption, simplifying Microsoft's implementation. This class can be initialized with a TcpStream instance, for encrypting data to be sent over the network, with a FileStream instance, to encrypt a file, with a MemoryStream instance, to encrypt data in memory, or with any other type of Stream.

Example

The following example demonstrates encrypting data and writing to a SymmetricCryptoStream on the fly.

[Visual Basic]

' Create a key and some data.

Dim key As Byte() = System.Text.Encoding.Default.GetBytes("test key")

Dim data As Byte() = System.Text.Encoding.Default.GetBytes("This is the plain text data")



' Create a FileStream to hold the data

Dim f As System.IO.FileStream = New System.IO.FileStream("C:\encrypted\file.txt", System.IO.FileMode.Create)

Dim sc As New SymmetricCryptoStream(AlgorithmType.Rijndael, key, f)



' Always must flush the final block after writing.

sc.FlushFinalBlock()

f.Position=0

f.Close()



' The data is now encrypted and saved to a file. To decrypt, simply initialize a SymmetricCryptoStream

' in the same way as demonstrated above and read from the Filestream, instead of writing to it.

[C#]



// Create a key and some data.
byte[] key =
System.Text.Encoding.Default.GetBytes("test key");
byte[] data = System.Text.Encoding.Default.GetBytes("This is the plain text data");


// Create a FileStream to hold the data
System.IO.FileStream f = new System.IO.FileStream("C:\\encrypted\file.txt",
System.IO.FileMode.Create);

SymmetricCryptoStream sc = new SymmetricCryptoStream(key, f);


// Write to the file. This encrypts the data.
sc.Write(data, 0, data.Length);


// Always must flush the final block after writing.
sc.FlushFinalBlock();

f.Position=0;

f.Close();


// The data is now encrypted and saved to a file. To decrypt, simply initialize a SymmetricCryptoStream

// in the same way as demonstrated above and read from the Filestream, instead of writing to it.

Requirements

Namespace: Dart.PowerTCP.SslSockets

Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

Assembly: Dart.PowerTCP.SslSockets (in Dart.PowerTCP.SslSockets.dll)

See Also

Requirements

Language

SymmetricCryptoStream Class

Inheritance Hierarchy

Syntax

Remarks

Example

Requirements

See Also