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RijndaelManaged Class

Accesses the managed version of the Rijndael algorithm. This class cannot be inherited.

Namespace: System.Security.Cryptography
Assembly: mscorlib (in mscorlib.dll)

'Declaration
<ComVisibleAttribute(True)> _
Public NotInheritable Class RijndaelManaged
	Inherits Rijndael
'Usage
Dim instance As RijndaelManaged

/** @attribute ComVisibleAttribute(true) */ 
public final class RijndaelManaged extends Rijndael
ComVisibleAttribute(true) 
public final class RijndaelManaged extends Rijndael

This algorithm supports key lengths of 128, 192, or 256 bits.

Imports System
Imports System.IO
Imports System.Text
Imports System.Security.Cryptography

Namespace RijndaelManaged_Examples
    Class MyMainClass
        Public Shared Sub Main()
            Dim original As String = "This is a much longer string of data than a public/private key algorithm will accept."
            Dim roundtrip As String
            Dim textConverter As New ASCIIEncoding()
            Dim myRijndael As New RijndaelManaged()
            Dim fromEncrypt() As Byte
            Dim encrypted() As Byte
            Dim toEncrypt() As Byte
            Dim key() As Byte
            Dim IV() As Byte

            'Create a new key and initialization vector.
            myRijndael.GenerateKey()
            myRijndael.GenerateIV()

            'Get the key and IV.
            key = myRijndael.Key
            IV = myRijndael.IV

            'Get an encryptor.
            Dim encryptor As ICryptoTransform = myRijndael.CreateEncryptor(key, IV)

            'Encrypt the data.
            Dim msEncrypt As New MemoryStream()
            Dim csEncrypt As New CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write)

            'Convert the data to a byte array.
            toEncrypt = textConverter.GetBytes(original)

            'Write all data to the crypto stream and flush it.
            csEncrypt.Write(toEncrypt, 0, toEncrypt.Length)
            csEncrypt.FlushFinalBlock()

            'Get encrypted array of bytes.
            encrypted = msEncrypt.ToArray()

            'This is where the message would be transmitted to a recipient
            ' who already knows your secret key. Optionally, you can
            ' also encrypt your secret key using a public key algorithm
            ' and pass it to the mesage recipient along with the RijnDael
            ' encrypted message.            
            'Get a decryptor that uses the same key and IV as the encryptor.
            Dim decryptor As ICryptoTransform = myRijndael.CreateDecryptor(key, IV)

            'Now decrypt the previously encrypted message using the decryptor
            ' obtained in the above step.
            Dim msDecrypt As New MemoryStream(encrypted)
            Dim csDecrypt As New CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read)

            fromEncrypt = New Byte(encrypted.Length) {}

            'Read the data out of the crypto stream.
            csDecrypt.Read(fromEncrypt, 0, fromEncrypt.Length)

            'Convert the byte array back into a string.
            roundtrip = textConverter.GetString(fromEncrypt)

            'Display the original data and the decrypted data.
            Console.WriteLine("Original:   {0}", original)
            Console.WriteLine("Round Trip: {0}", roundtrip)
        End Sub 'Main
    End Class 'MyMainClass
End Namespace 'RijndaelManaged_Examples

package RijndaelManaged_Examples; 

import System.*;
import System.IO.*;
import System.Text.*;
import System.Security.Cryptography.*;

class MyMainClass
{
    public static void main(String[] args)
    {      
        String original = "This is a much longer string of data than a "
            + "public/private key algorithm will accept.";
        String roundTrip;
        ASCIIEncoding textConverter = new ASCIIEncoding();
        RijndaelManaged myRijndael = new RijndaelManaged();
        ubyte fromEncrypt[];
        ubyte encrypted[];
        ubyte toEncrypt[];
        ubyte key[];
        ubyte iv[];
        //Create a new key and initialization vector.
        myRijndael.GenerateKey();
        myRijndael.GenerateIV();
        //Get the key and iv.
        key = myRijndael.get_Key();
        iv = myRijndael.get_IV();
        //Get an encryptor.
        ICryptoTransform encryptor = myRijndael.CreateEncryptor(key, iv);
        //Encrypt the data.
        MemoryStream msEncrypt = new MemoryStream();
        CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, 
            CryptoStreamMode.Write);
        //Convert the data to a byte array.
        toEncrypt = textConverter.GetBytes(original);
        //Write all data to the crypto stream and flush it.
        csEncrypt.Write(toEncrypt, 0, toEncrypt.get_Length());
        csEncrypt.FlushFinalBlock();
        //Get encrypted array of bytes.
        encrypted = msEncrypt.ToArray();
        //This is where the message would be transmitted to a recipient
        // who already knows your secret key. Optionally, you can
        // also encrypt your secret key using a public key algorithm
        // and pass it to the mesage recipient along with the RijnDael
        // encrypted message.            
        //Get a decryptor that uses the same key and iv as the encryptor.
        ICryptoTransform decryptor = myRijndael.CreateDecryptor(key, iv);
        //Now decrypt the previously encrypted message using the decryptor
        // obtained in the above step.
        MemoryStream msDecrypt = new MemoryStream(encrypted);
        CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor,
            CryptoStreamMode.Read);
        fromEncrypt = new ubyte[encrypted.get_Length()];
        //Read the data out of the crypto stream.
        csDecrypt.Read(fromEncrypt, 0, fromEncrypt.get_Length());
        //Convert the byte array back into a string.
        roundTrip = textConverter.GetString(fromEncrypt);
        //Display the original data and the decrypted data.
        Console.WriteLine("Original:   {0}", original);
        Console.WriteLine("Round Trip: {0}", roundTrip);
    } //main
} //MyMainClass

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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.

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0

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