RNGCryptoServiceProvider Clase

Definición

Espacio de nombres:

System.Security.Cryptography

Ensamblado:

System.Security.Cryptography.dll

Source:

RNGCryptoServiceProvider.cs

Precaución

RNGCryptoServiceProvider is obsolete. To generate a random number, use one of the RandomNumberGenerator static methods instead.

Implementa un generador de números aleatorios (RNG) criptográfico mediante la implementación proporcionada por el proveedor de servicios criptográficos (CSP). Esta clase no puede heredarse.

public ref class RNGCryptoServiceProvider sealed : System::Security::Cryptography::RandomNumberGenerator

[System.Obsolete("RNGCryptoServiceProvider is obsolete. To generate a random number, use one of the RandomNumberGenerator static methods instead.", DiagnosticId="SYSLIB0023", UrlFormat="https://aka.ms/dotnet-warnings/{0}")]
public sealed class RNGCryptoServiceProvider : System.Security.Cryptography.RandomNumberGenerator

[<System.Obsolete("RNGCryptoServiceProvider is obsolete. To generate a random number, use one of the RandomNumberGenerator static methods instead.", DiagnosticId="SYSLIB0023", UrlFormat="https://aka.ms/dotnet-warnings/{0}")>]
type RNGCryptoServiceProvider = class
    inherit RandomNumberGenerator

Public NotInheritable Class RNGCryptoServiceProvider
Inherits RandomNumberGenerator

Herencia

Object

RandomNumberGenerator

RNGCryptoServiceProvider

Atributos

ObsoleteAttribute

Ejemplos

En el ejemplo de código siguiente se muestra cómo crear un número aleatorio con la RNGCryptoServiceProvider clase .

//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;

ref class RNGCSP
{
public:
    // Main method.
    static void Main()
    {
        const int totalRolls = 25000;
        array<int>^ results = gcnew array<int>(6);

        // Roll the dice 25000 times and display
        // the results to the console.
        for (int x = 0; x < totalRolls; x++)
        {
            Byte roll = RollDice((Byte)results->Length);
            results[roll - 1]++;
        }
        for (int i = 0; i < results->Length; ++i)
        {
            Console::WriteLine("{0}: {1} ({2:p1})", i + 1, results[i], (double)results[i] / (double)totalRolls);
        }
    }

    // This method simulates a roll of the dice. The input parameter is the
    // number of sides of the dice.

    static Byte RollDice(Byte numberSides)
    {
        if (numberSides <= 0)
            throw gcnew ArgumentOutOfRangeException("numberSides");
        // Create a new instance of the RNGCryptoServiceProvider.
        RNGCryptoServiceProvider^ rngCsp = gcnew RNGCryptoServiceProvider();
        // Create a byte array to hold the random value.
        array<Byte>^ randomNumber = gcnew array<Byte>(1);
        do
        {
            // Fill the array with a random value.
            rngCsp->GetBytes(randomNumber);
        }
        while (!IsFairRoll(randomNumber[0], numberSides));
        // Return the random number mod the number
        // of sides.  The possible values are zero-
        // based, so we add one.
        return (Byte)((randomNumber[0] % numberSides) + 1);
    }

private:
    static bool IsFairRoll(Byte roll, Byte numSides)
    {
        // There are MaxValue / numSides full sets of numbers that can come up
        // in a single byte.  For instance, if we have a 6 sided die, there are
        // 42 full sets of 1-6 that come up.  The 43rd set is incomplete.
        int fullSetsOfValues = Byte::MaxValue / numSides;

        // If the roll is within this range of fair values, then we let it continue.
        // In the 6 sided die case, a roll between 0 and 251 is allowed.  (We use
        // < rather than <= since the = portion allows through an extra 0 value).
        // 252 through 255 would provide an extra 0, 1, 2, 3 so they are not fair
        // to use.
        return roll < numSides * fullSetsOfValues;
    }
};

int main()
{
    RNGCSP::Main();
}

//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
{
    private static RNGCryptoServiceProvider rngCsp = new RNGCryptoServiceProvider();
    // Main method.
    public static void Main()
    {
        const int totalRolls = 25000;
        int[] results = new int[6];

        // Roll the dice 25000 times and display
        // the results to the console.
        for (int x = 0; x < totalRolls; x++)
        {
            byte roll = RollDice((byte)results.Length);
            results[roll - 1]++;
        }
        for (int i = 0; i < results.Length; ++i)
        {
            Console.WriteLine("{0}: {1} ({2:p1})", i + 1, results[i], (double)results[i] / (double)totalRolls);
        }
        rngCsp.Dispose();
    }

    // This method simulates a roll of the dice. The input parameter is the
    // number of sides of the dice.

    public static byte RollDice(byte numberSides)
    {
        if (numberSides <= 0)
            throw new ArgumentOutOfRangeException("numberSides");

        // Create a byte array to hold the random value.
        byte[] randomNumber = new byte[1];
        do
        {
            // Fill the array with a random value.
            rngCsp.GetBytes(randomNumber);
        }
        while (!IsFairRoll(randomNumber[0], numberSides));
        // Return the random number mod the number
        // of sides.  The possible values are zero-
        // based, so we add one.
        return (byte)((randomNumber[0] % numberSides) + 1);
    }

    private static bool IsFairRoll(byte roll, byte numSides)
    {
        // There are MaxValue / numSides full sets of numbers that can come up
        // in a single byte.  For instance, if we have a 6 sided die, there are
        // 42 full sets of 1-6 that come up.  The 43rd set is incomplete.
        int fullSetsOfValues = Byte.MaxValue / numSides;

        // If the roll is within this range of fair values, then we let it continue.
        // In the 6 sided die case, a roll between 0 and 251 is allowed.  (We use
        // < rather than <= since the = portion allows through an extra 0 value).
        // 252 through 255 would provide an extra 0, 1, 2, 3 so they are not fair
        // to use.
        return roll < numSides * fullSetsOfValues;
    }
}

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



Class RNGCSP
    Private Shared rngCsp As New RNGCryptoServiceProvider()
    ' Main method.
    Public Shared Sub Main()
        Const totalRolls As Integer = 25000
        Dim results(5) As Integer

        ' Roll the dice 25000 times and display
        ' the results to the console.
        Dim x As Integer
        For x = 0 To totalRolls
            Dim roll As Byte = RollDice(System.Convert.ToByte(results.Length))
            results((roll - 1)) += 1
        Next x
        Dim i As Integer

        While i < results.Length
            Console.WriteLine("{0}: {1} ({2:p1})", i + 1, results(i), System.Convert.ToDouble(results(i)) / System.Convert.ToDouble(totalRolls))
            i += 1
        End While
        rngCsp.Dispose()
    End Sub


    ' This method simulates a roll of the dice. The input parameter is the
    ' number of sides of the dice.
    Public Shared Function RollDice(ByVal numberSides As Byte) As Byte
        If numberSides <= 0 Then
            Throw New ArgumentOutOfRangeException("NumSides")
        End If 
        ' Create a byte array to hold the random value.
        Dim randomNumber(0) As Byte
        Do
            ' Fill the array with a random value.
            rngCsp.GetBytes(randomNumber)
        Loop While Not IsFairRoll(randomNumber(0), numberSides)
        ' Return the random number mod the number
        ' of sides.  The possible values are zero-
        ' based, so we add one.
        Return System.Convert.ToByte(randomNumber(0) Mod numberSides + 1)

    End Function


    Private Shared Function IsFairRoll(ByVal roll As Byte, ByVal numSides As Byte) As Boolean
        ' There are MaxValue / numSides full sets of numbers that can come up
        ' in a single byte.  For instance, if we have a 6 sided die, there are
        ' 42 full sets of 1-6 that come up.  The 43rd set is incomplete.
        Dim fullSetsOfValues As Integer = [Byte].MaxValue / numSides

        ' If the roll is within this range of fair values, then we let it continue.
        ' In the 6 sided die case, a roll between 0 and 251 is allowed.  (We use
        ' < rather than <= since the = portion allows through an extra 0 value).
        ' 252 through 255 would provide an extra 0, 1, 2, 3 so they are not fair
        ' to use.
        Return roll < numSides * fullSetsOfValues

    End Function 'IsFairRoll
End Class

Comentarios

Importante

Este tipo implementa la interfaz IDisposable. Cuando haya terminado de utilizar el tipo, debe desecharlo directa o indirectamente. Para eliminar el tipo directamente, llame a su método Dispose en un bloque try/catch. Para deshacerse de él indirectamente, use una construcción de lenguaje como using (en C#) o Using (en Visual Basic). Para más información, vea la sección "Uso de objetos que implementan IDisposable" en el tema de la interfaz IDisposable.

Constructores

RNGCryptoServiceProvider()	Obsoletos. Inicializa una nueva instancia de la clase RNGCryptoServiceProvider.
RNGCryptoServiceProvider(Byte[])	Obsoletos. Inicializa una nueva instancia de la clase RNGCryptoServiceProvider.
RNGCryptoServiceProvider(CspParameters)	Obsoletos. Inicializa una nueva instancia de la clase RNGCryptoServiceProvider con los parámetros especificados.
RNGCryptoServiceProvider(String)	Obsoletos. Inicializa una nueva instancia de la clase RNGCryptoServiceProvider.

Métodos

Dispose()	Obsoletos. Cuando se reemplaza en una clase derivada, libera todos los recursos usados por la instancia actual de la clase RandomNumberGenerator. (Heredado de RandomNumberGenerator)
Dispose(Boolean)	Obsoletos. Cuando se reemplaza en una clase derivada, libera los recursos no administrados usados por RandomNumberGenerator y, de forma opcional, libera los recursos administrados. (Heredado de RandomNumberGenerator)
Equals(Object)	Obsoletos. Determina si el objeto especificado es igual que el objeto actual. (Heredado de Object)
GetBytes(Byte[])	Obsoletos. Rellena una matriz de bytes con una secuencia aleatoria de valores sólidamente cifrada.
GetBytes(Byte[], Int32, Int32)	Obsoletos. Rellena la matriz de bytes especificada con una secuencia aleatoria de valores criptográficamente segura a partir de un índice especificado y para un número de bytes especificado.
GetBytes(Span<Byte>)	Obsoletos. Rellena un intervalo con bytes aleatorios criptográficamente seguros.
GetHashCode()	Obsoletos. Sirve como la función hash predeterminada. (Heredado de Object)
GetNonZeroBytes(Byte[])	Obsoletos. Rellena una matriz de bytes con una secuencia aleatoria de valores distintos de cero sólidamente cifrada.
GetNonZeroBytes(Span<Byte>)	Obsoletos. Rellena un intervalo de bytes con una secuencia aleatoria criptográficamente segura de valores distintos de cero.
GetType()	Obsoletos. Obtiene el Type de la instancia actual. (Heredado de Object)
MemberwiseClone()	Obsoletos. Crea una copia superficial del Object actual. (Heredado de Object)
ToString()	Obsoletos. Devuelve una cadena que representa el objeto actual. (Heredado de Object)

Seguridad para subprocesos

Este tipo es seguro para la ejecución de subprocesos.

Consulte también

• servicios criptográficos