RNGCryptoServiceProvider-Klasse

Implementiert einen kryptografischen Zufallszahlen-Generator (Random Number Generator, RNG) unter Verwendung der Implementierung, die der Kryptografiedienstanbieter (Cryptographic Service Provider, CSP) bereitstellt. Diese Klasse kann nicht vererbt werden.

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

Syntax

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

[ComVisibleAttribute(true)] 
public sealed class RNGCryptoServiceProvider : RandomNumberGenerator

[ComVisibleAttribute(true)] 
public ref class RNGCryptoServiceProvider sealed : public RandomNumberGenerator

/** @attribute ComVisibleAttribute(true) */ 
public final class RNGCryptoServiceProvider extends RandomNumberGenerator

ComVisibleAttribute(true) 
public final class RNGCryptoServiceProvider extends RandomNumberGenerator

Beispiel

Das folgende Codebeispiel veranschaulicht das Erstellen einer Zufallszahl mit der RNGCryptoServiceProvider-Klasse.

'The following sample uses the Cryptography class to simulate the roll of a dice.
Imports System
Imports System.IO
Imports System.Text
Imports System.Security.Cryptography



Class RNGCSP
    
    ' Main method.
    Public Shared Sub Main()
        ' Roll the dice 30 times and display 
        ' the results to the console.
        Dim x As Integer
        For x = 0 To 30
            Console.WriteLine(RollDice(6))
        Next x
    End Sub 'Main
     
    ' This method simulates a roll of the dice. The input parameter is the 
    ' number of sides of the dice.
    Public Shared Function RollDice(NumSides As Integer) As Integer
        ' Create a byte array to hold the random value.
        Dim randomNumber(0) As Byte
        
        ' Create a new instance of the RNGCryptoServiceProvider. 
        Dim Gen As New RNGCryptoServiceProvider()
        
        ' Fill the array with a random value.
        Gen.GetBytes(randomNumber)
        
        ' Convert the byte to an integer value to make the modulus operation easier.
        Dim rand As Integer = Convert.ToInt32(randomNumber(0))
        
        ' Return the random number mod the number
        ' of sides.  The possible values are zero-
        ' based, so we add one.
        Return rand Mod NumSides + 1
    End Function 'RollDice
End Class 'CryptoMemoryStream

//The following sample uses the Cryptography class to simulate the roll of a dice.

using System;
using System.IO;
using System.Text;
using System.Security.Cryptography;

class RNGCSP
{
    // Main method.
    public static void Main()
    {
        // Roll the dice 30 times and display 
        // the results to the console.
        for(int x = 0; x <= 30; x++)
            Console.WriteLine(RollDice(6));
    }
    
    // This method simulates a roll of the dice. The input parameter is the 
    // number of sides of the dice.
    public static int RollDice(int NumSides)
    {
        // Create a byte array to hold the random value.
        byte[] randomNumber = new byte[1];

        // Create a new instance of the RNGCryptoServiceProvider. 
        RNGCryptoServiceProvider Gen = new RNGCryptoServiceProvider();

        // Fill the array with a random value.
        Gen.GetBytes(randomNumber);

        // Convert the byte to an integer value to make the modulus operation easier.
        int rand = Convert.ToInt32(randomNumber[0]);

        // Return the random number mod the number
        // of sides.  The possible values are zero-
        // based, so we add one.
        return rand % NumSides + 1;
    }
}

// The following sample uses the Cryptography class
// to simulate the roll of a dice.

using namespace System;
using namespace System::IO;
using namespace System::Text;
using namespace System::Security::Cryptography;

int RollDice(int numberSides)
{
    // Create a byte array to hold the random value.
    array<Byte>^ randomNumber = gcnew array<Byte>(1);

    // Create a new instance of the RNGCryptoServiceProvider.
    RNGCryptoServiceProvider^ cryptoProvider =
        gcnew RNGCryptoServiceProvider();

    // Fill the array with a random value.
    cryptoProvider->GetBytes(randomNumber);

    // Convert the byte to an integer value to make the modulus operation
    // easier.
    int rand = Convert::ToInt32(randomNumber[0]);

    // Return the random number mod the number of sides.  The possible
    // values are zero-based, so we add one.
    return (rand % numberSides) + 1;
}
    
int main()
{
    // Roll the dice 30 times and display
    // the results to the console.
    for (int i = 0; i <= 30; i++)
    {
        Console::WriteLine(RollDice(6));
    }
}

Vererbungshierarchie

System.Object
   System.Security.Cryptography.RandomNumberGenerator
    System.Security.Cryptography.RNGCryptoServiceProvider

Threadsicherheit

Alle öffentlichen statischen (Shared in Visual Basic) Member dieses Typs sind threadsicher. Bei Instanzmembern ist die Threadsicherheit nicht gewährleistet.

Plattformen

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile für Pocket PC, Windows Mobile für Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

.NET Framework unterstützt nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen.

Versionsinformationen

.NET Framework

Unterstützt in: 2.0, 1.1, 1.0

.NET Compact Framework

Unterstützt in: 2.0

Siehe auch

Referenz

RNGCryptoServiceProvider-Member
System.Security.Cryptography-Namespace

Weitere Ressourcen

Kryptografische Dienste