RNGCryptoServiceProvider Kelas

Definisi

Ruang nama:

System.Security.Cryptography

Rakitan:

System.Security.Cryptography.dll

Sumber:

RNGCryptoServiceProvider.cs

Perhatian

RNGCryptoServiceProvider is obsolete.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

Menerapkan Generator Angka Acak (RNG) kriptografi menggunakan implementasi yang disediakan oleh penyedia layanan kriptografi (CSP). Kelas ini tidak dapat diwariskan.

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[System.Obsolete("RNGCryptoServiceProvider is obsolete.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System.Obsolete("RNGCryptoServiceProvider is obsolete.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

Warisan

Object

RandomNumberGenerator

RNGCryptoServiceProvider

Atribut

ObsoleteAttribute

Contoh

Contoh kode berikut menunjukkan cara membuat angka acak dengan RNGCryptoServiceProvider kelas .

//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

Keterangan

Penting

Jenis ini mengimplementasikan IDisposable antarmuka. Ketika Anda telah selesai menggunakan jenis , Anda harus membuangnya baik secara langsung atau tidak langsung. Untuk membuang jenis secara langsung, panggil metodenya Dispose dalam try/catch blok. Untuk membuangnya secara tidak langsung, gunakan konstruksi bahasa seperti using (dalam C#) atau Using (di Visual Basic). Untuk informasi selengkapnya, lihat bagian "Menggunakan Objek yang Mengimplementasikan IDisposable" dalam IDisposable topik antarmuka.

Konstruktor

RNGCryptoServiceProvider()	Kedaluwarsa. Menginisialisasi instans baru kelas RNGCryptoServiceProvider.
RNGCryptoServiceProvider(Byte[])	Kedaluwarsa. Menginisialisasi instans baru kelas RNGCryptoServiceProvider.
RNGCryptoServiceProvider(CspParameters)	Kedaluwarsa. Menginisialisasi instans RNGCryptoServiceProvider baru kelas dengan parameter yang ditentukan.
RNGCryptoServiceProvider(String)	Kedaluwarsa. Menginisialisasi instans baru kelas RNGCryptoServiceProvider.

Metode

Dispose()	Kedaluwarsa. Saat ditimpa di kelas turunan, merilis semua sumber daya yang digunakan oleh instans RandomNumberGenerator kelas saat ini. (Diperoleh dari RandomNumberGenerator)
Dispose(Boolean)	Kedaluwarsa. Saat ditimpa di kelas turunan, merilis sumber daya tidak terkelola yang RandomNumberGenerator digunakan oleh dan secara opsional merilis sumber daya terkelola. (Diperoleh dari RandomNumberGenerator)
Equals(Object)	Kedaluwarsa. Menentukan apakah objek yang ditentukan sama dengan objek saat ini. (Diperoleh dari Object)
GetBytes(Byte[])	Kedaluwarsa. Mengisi array byte dengan urutan nilai acak yang kuat secara kriptografis.
GetBytes(Byte[], Int32, Int32)	Kedaluwarsa. Mengisi array byte yang ditentukan dengan urutan nilai acak yang kuat secara kriptografis dimulai pada indeks tertentu untuk jumlah byte tertentu.
GetBytes(Span<Byte>)	Kedaluwarsa. Mengisi rentang dengan byte acak yang kuat secara kriptografis.
GetHashCode()	Kedaluwarsa. Berfungsi sebagai fungsi hash default. (Diperoleh dari Object)
GetNonZeroBytes(Byte[])	Kedaluwarsa. Mengisi array byte dengan urutan nilai nonzero acak yang kuat secara kriptografis.
GetNonZeroBytes(Span<Byte>)	Kedaluwarsa. Mengisi rentang byte dengan urutan acak nilai nonzero yang kuat secara kriptografis.
GetType()	Kedaluwarsa. Mendapatkan instans Type saat ini. (Diperoleh dari Object)
MemberwiseClone()	Kedaluwarsa. Membuat salinan dangkal dari yang saat ini Object. (Diperoleh dari Object)
ToString()	Kedaluwarsa. Mengembalikan string yang mewakili objek saat ini. (Diperoleh dari Object)

Keamanan Thread

Jenis ini aman untuk utas.

Lihat juga

• Layanan Kriptografi