RNGCryptoServiceProvider Konstruktory

Definice

Obor názvů:

System.Security.Cryptography

Sestavení:

System.Security.Cryptography.dll

Inicializuje novou instanci RNGCryptoServiceProvider třídy.

Přetížení

RNGCryptoServiceProvider()	Inicializuje novou instanci RNGCryptoServiceProvider třídy.
RNGCryptoServiceProvider(Byte[])	Inicializuje novou instanci RNGCryptoServiceProvider třídy.
RNGCryptoServiceProvider(CspParameters)	Inicializuje novou instanci RNGCryptoServiceProvider třídy se zadanými parametry.
RNGCryptoServiceProvider(String)	Inicializuje novou instanci RNGCryptoServiceProvider třídy.

RNGCryptoServiceProvider()

Zdroj:

RNGCryptoServiceProvider.cs

Inicializuje novou instanci RNGCryptoServiceProvider třídy.

public:
 RNGCryptoServiceProvider();

public RNGCryptoServiceProvider ();

Public Sub New ()

Příklady

Následující příklad kódu ukazuje, jak vytvořit náhodné číslo s RNGCryptoServiceProvider třídou.

//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

Viz také

• Šifrovací služby

RNGCryptoServiceProvider(Byte[])

Zdroj:

RNGCryptoServiceProvider.cs

Inicializuje novou instanci RNGCryptoServiceProvider třídy.

public:
 RNGCryptoServiceProvider(cli::array <System::Byte> ^ rgb);

public RNGCryptoServiceProvider (byte[] rgb);

new System.Security.Cryptography.RNGCryptoServiceProvider : byte[] -> System.Security.Cryptography.RNGCryptoServiceProvider

Public Sub New (rgb As Byte())

Parametry

rgb

Byte[]

Pole bajtů. Tato hodnota je ignorována.

Poznámky

Tato metoda přímo neicializuje RNGCryptoServiceProvider třídu. Volání této metody je ekvivalentní volání konstruktoru RNGCryptoServiceProvider(CspParameters) a předání null.

Viz také

• Šifrovací služby

RNGCryptoServiceProvider(CspParameters)

Zdroj:

RNGCryptoServiceProvider.cs

Inicializuje novou instanci RNGCryptoServiceProvider třídy se zadanými parametry.

public:
 RNGCryptoServiceProvider(System::Security::Cryptography::CspParameters ^ cspParams);

public RNGCryptoServiceProvider (System.Security.Cryptography.CspParameters? cspParams);

new System.Security.Cryptography.RNGCryptoServiceProvider : System.Security.Cryptography.CspParameters -> System.Security.Cryptography.RNGCryptoServiceProvider

Public Sub New (cspParams As CspParameters)

Parametry

cspParams

CspParameters

Parametry, které se mají předat zprostředkovateli kryptografických služeb (CSP).

Viz také

• Šifrovací služby

RNGCryptoServiceProvider(String)

Zdroj:

RNGCryptoServiceProvider.cs

Inicializuje novou instanci RNGCryptoServiceProvider třídy.

public:
 RNGCryptoServiceProvider(System::String ^ str);

public RNGCryptoServiceProvider (string str);

new System.Security.Cryptography.RNGCryptoServiceProvider : string -> System.Security.Cryptography.RNGCryptoServiceProvider

Public Sub New (str As String)

Parametry

str

String

Řetězcový vstup. Tento parametr je ignorován.

Poznámky

Tato metoda přímo neicializuje RNGCryptoServiceProvider třídu. Volání této metody je ekvivalentní volání konstruktoru RNGCryptoServiceProvider(CspParameters) a předání null.

Viz také

• Šifrovací služby