RNGCryptoServiceProvider RNGCryptoServiceProvider RNGCryptoServiceProvider RNGCryptoServiceProvider Class

Определение

Реализует криптографический генератор случайных чисел, используя реализацию, предоставляемую поставщиком служб шифрования (CSP).Implements a cryptographic Random Number Generator (RNG) using the implementation provided by the cryptographic service provider (CSP). Этот класс не наследуется.This class cannot be inherited.

public ref class RNGCryptoServiceProvider sealed : System::Security::Cryptography::RandomNumberGenerator
[System.Runtime.InteropServices.ComVisible(true)]
public sealed class RNGCryptoServiceProvider : System.Security.Cryptography.RandomNumberGenerator
type RNGCryptoServiceProvider = class
    inherit RandomNumberGenerator
Public NotInheritable Class RNGCryptoServiceProvider
Inherits RandomNumberGenerator
Наследование
RNGCryptoServiceProviderRNGCryptoServiceProviderRNGCryptoServiceProviderRNGCryptoServiceProvider
Атрибуты

Примеры

В следующем примере кода показано, как создать случайное число с RNGCryptoServiceProvider класса.The following code example shows how to create a random number with the RNGCryptoServiceProvider class.

//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();
        Console.ReadLine();
    }

    // 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
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()
        Console.ReadLine()
    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

Комментарии

Важно!

Этот тип реализует IDisposable интерфейс.This type implements the IDisposable interface. Когда вы закончите, используя тип, следует освободить его прямо или косвенно.When you have finished using the type, you should dispose of it either directly or indirectly. Чтобы удалить тип напрямую, вызовите его Dispose метод в try / catch блока.To dispose of the type directly, call its Dispose method in a try/catch block. Чтобы избавиться от его косвенно, используйте языковой конструкции, такие как using (в C#) или Using (в Visual Basic).To dispose of it indirectly, use a language construct such as using (in C#) or Using (in Visual Basic). Дополнительные сведения см. в разделе «С помощью объекта, реализует IDisposable» IDisposable разделу интерфейса.For more information, see the "Using an Object that Implements IDisposable" section in the IDisposable interface topic.

Конструкторы

RNGCryptoServiceProvider() RNGCryptoServiceProvider() RNGCryptoServiceProvider() RNGCryptoServiceProvider()

Инициализирует новый экземпляр класса RNGCryptoServiceProvider.Initializes a new instance of the RNGCryptoServiceProvider class.

RNGCryptoServiceProvider(Byte[]) RNGCryptoServiceProvider(Byte[]) RNGCryptoServiceProvider(Byte[]) RNGCryptoServiceProvider(Byte[])

Инициализирует новый экземпляр класса RNGCryptoServiceProvider.Initializes a new instance of the RNGCryptoServiceProvider class.

RNGCryptoServiceProvider(CspParameters) RNGCryptoServiceProvider(CspParameters) RNGCryptoServiceProvider(CspParameters) RNGCryptoServiceProvider(CspParameters)

Инициализирует новый экземпляр класса RNGCryptoServiceProvider заданными параметрами.Initializes a new instance of the RNGCryptoServiceProvider class with the specified parameters.

RNGCryptoServiceProvider(String) RNGCryptoServiceProvider(String) RNGCryptoServiceProvider(String) RNGCryptoServiceProvider(String)

Инициализирует новый экземпляр класса RNGCryptoServiceProvider.Initializes a new instance of the RNGCryptoServiceProvider class.

Методы

Dispose() Dispose() Dispose() Dispose()

При переопределении в производном классе освобождает все ресурсы, используемые текущим объектом RandomNumberGenerator.When overridden in a derived class, releases all resources used by the current instance of the RandomNumberGenerator class.

(Inherited from RandomNumberGenerator)
Dispose(Boolean) Dispose(Boolean) Dispose(Boolean) Dispose(Boolean)

При переопределении в производном классе освобождает неуправляемые ресурсы, используемые объектом RandomNumberGenerator, и при необходимости также освобождает управляемые ресурсы.When overridden in a derived class, releases the unmanaged resources used by the RandomNumberGenerator and optionally releases the managed resources.

(Inherited from RandomNumberGenerator)
Equals(Object) Equals(Object) Equals(Object) Equals(Object)

Определяет, равен ли заданный объект текущему объекту.Determines whether the specified object is equal to the current object.

(Inherited from Object)
Finalize() Finalize() Finalize() Finalize()
GetBytes(Byte[]) GetBytes(Byte[]) GetBytes(Byte[]) GetBytes(Byte[])

Заполняет массив байтов криптостойкой последовательностью случайных значений.Fills an array of bytes with a cryptographically strong sequence of random values.

GetBytes(Byte[], Int32, Int32) GetBytes(Byte[], Int32, Int32) GetBytes(Byte[], Int32, Int32) GetBytes(Byte[], Int32, Int32)
GetBytes(Span<Byte>) GetBytes(Span<Byte>) GetBytes(Span<Byte>) GetBytes(Span<Byte>)
GetHashCode() GetHashCode() GetHashCode() GetHashCode()

Служит хэш-функцией по умолчанию.Serves as the default hash function.

(Inherited from Object)
GetNonZeroBytes(Byte[]) GetNonZeroBytes(Byte[]) GetNonZeroBytes(Byte[]) GetNonZeroBytes(Byte[])

Заполняет массив байтов криптостойкой последовательностью случайных ненулевых значений.Fills an array of bytes with a cryptographically strong sequence of random nonzero values.

GetNonZeroBytes(Span<Byte>) GetNonZeroBytes(Span<Byte>) GetNonZeroBytes(Span<Byte>) GetNonZeroBytes(Span<Byte>)
GetType() GetType() GetType() GetType()

Возвращает объект Type для текущего экземпляра.Gets the Type of the current instance.

(Inherited from Object)
MemberwiseClone() MemberwiseClone() MemberwiseClone() MemberwiseClone()

Создает неполную копию текущего объекта Object.Creates a shallow copy of the current Object.

(Inherited from Object)
ToString() ToString() ToString() ToString()

Возвращает строку, представляющую текущий объект.Returns a string that represents the current object.

(Inherited from Object)

Применяется к

Потокобезопасность

Данный тип потокобезопасен.This type is thread safe.

Дополнительно