RijndaelManaged Class
.NET Framework 2.0
Accesses the managed version of the Rijndael algorithm. This class cannot be inherited.
Namespace: System.Security.Cryptography
Assembly: mscorlib (in mscorlib.dll)
System.Security.Cryptography Namespace
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.
| Topic | Location |
|---|---|
| How to: Decrypt XML Elements with Symmetric Keys | .NET Framework: Security |
| How to: Encrypt XML Elements with Symmetric Keys | .NET Framework: Security |
| How to: Decrypt XML Elements with Symmetric Keys | .NET Framework: Security |
| How to: Encrypt XML Elements with Symmetric Keys | .NET Framework: Security |
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
System.Object
System.Security.Cryptography.SymmetricAlgorithm
System.Security.Cryptography.Rijndael
System.Security.Cryptography.RijndaelManaged
System.Security.Cryptography.SymmetricAlgorithm
System.Security.Cryptography.Rijndael
System.Security.Cryptography.RijndaelManaged
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.
Reference
RijndaelManaged MembersSystem.Security.Cryptography Namespace
Other Resources
Cryptographic ServicesCommunity Additions
ADD
Show: