MaskGenerationMethod 클래스

정의

네임스페이스:

System.Security.Cryptography

어셈블리:

System.Security.Cryptography.dll

모든 마스크 생성기 알고리즘이 파생될 추상 클래스를 나타냅니다.

public ref class MaskGenerationMethod abstract

public abstract class MaskGenerationMethod

type MaskGenerationMethod = class

Public MustInherit Class MaskGenerationMethod

상속

Object

MaskGenerationMethod

파생

System.Security.Cryptography.PKCS1MaskGenerationMethod

예제

다음 코드 예제에서 파생 MaskGenerationMethod 하는 방법을 보여 줍니다는 클래스입니다.

#using <System.dll>

using namespace System;
using namespace System::Security::Cryptography;

namespace Contoso
{
    ref class MaskGenerator: MaskGenerationMethod
    {
    private:
        String^ hashNameValue;

    public:
        // Initialize a mask to encrypt using the SHA256 algorithm.
        MaskGenerator()
        {
            hashNameValue = "SHA256";
        }

        // Create a mask with the specified seed.
        virtual array<Byte>^ GenerateMask(array<Byte>^ seed, int maskLength) override
        {
            HashAlgorithm^ hash;
            array<Byte>^ rgbCounter = gcnew array<Byte>(4);
            array<Byte>^ targetRgb = gcnew array<Byte>(maskLength);
            UInt32 counter = 0;
            for (int inc = 0; inc < targetRgb->Length; )
            {
                ConvertIntToByteArray(counter++, rgbCounter);
                hash = (HashAlgorithm^)CryptoConfig::CreateFromName(
                    hashNameValue);
                array<Byte>^ temp = gcnew array<Byte>(
                    4 + seed->Length);
                Buffer::BlockCopy(rgbCounter, 0, temp, 0, 4);
                Buffer::BlockCopy(seed, 0, temp, 4, seed->Length);
                hash->ComputeHash(temp);
                if (targetRgb->Length - inc > hash->HashSize / 8)
                {
                    Buffer::BlockCopy(hash->Hash, 0, targetRgb, inc,
                        hash->Hash->Length);
                }
                else
                {
                    Buffer::BlockCopy(hash->Hash, 0, targetRgb, inc,
                        targetRgb->Length - inc);
                }

                inc += hash->Hash->Length;
            }
            return targetRgb;
        }

    private:
        // Convert the specified integer to the byte array.
        void ConvertIntToByteArray(UInt32 source,
            array<Byte>^ targetBytes)
        {
            UInt32 remainder;
            int inc = 0;

            // Clear the array prior to filling it.
            Array::Clear(targetBytes, 0, targetBytes->Length);
            while (source > 0)
            {
                remainder = source % 256;
                targetBytes[ 3 - inc ] = (Byte)remainder;
                source = (source - remainder) / 256;
                inc++;
            }
        }
    };

    // This class demonstrates how to create the MaskGenerator class 
    // and call its GenerateMask member.
    ref class MaskGeneratorImpl
    {
    public:
        void static Work()
        {
            array<Byte>^ seed = gcnew array<Byte>(4){
                0x01,0x02,0x03,0x04};
            int length = 16;
            MaskGenerator^ maskGenerator = gcnew MaskGenerator;
            array<Byte>^ mask = maskGenerator->GenerateMask(seed,
                length);
            Console::WriteLine("Generated the following mask:");
            Console::WriteLine(System::Text::Encoding::
                ASCII::get()->GetString(mask));
            Console::WriteLine("This sample completed successfully;"
                " press Enter to exit.");
            Console::ReadLine();
        }
    };
}

void main()
{
    Contoso::MaskGeneratorImpl::Work();
}

//
// This sample produces the following output:
//
// Generated the following mask:
// ?"TFd(?~OtO?
// This sample completed successfully; press Enter to exit.

using System;
using System.Security.Cryptography;

namespace Contoso
{
    class MaskGenerator : System.Security.Cryptography.MaskGenerationMethod
    {
        private String HashNameValue;

        // Initialize a mask to encrypt using the SHA256 algorithm.
        public MaskGenerator() 
        {
            HashNameValue = "SHA256";
        }

        // Create a mask with the specified seed.
        override public byte[] GenerateMask(byte[] seed, int maskLength)
        {
            HashAlgorithm hash;
            byte[] rgbCounter = new byte[4];
            byte[] targetRgb = new byte[maskLength];
            uint counter = 0;

            for (int inc = 0; inc < targetRgb.Length; )
            {
                ConvertIntToByteArray(counter++, ref rgbCounter);
                hash = (HashAlgorithm)
                    CryptoConfig.CreateFromName(HashNameValue);

                byte[] temp = new byte[4 + seed.Length];
                Buffer.BlockCopy(rgbCounter, 0, temp, 0, 4);
                Buffer.BlockCopy(seed, 0, temp, 4, seed.Length);
                hash.ComputeHash(temp);

                if (targetRgb.Length - inc > hash.HashSize/8) 
                {
                    Buffer.BlockCopy(
                        hash.Hash,
                        0,
                        targetRgb,
                        inc,
                        hash.Hash.Length);
                }
                else
                {
                    Buffer.BlockCopy(
                        hash.Hash,
                        0,
                        targetRgb,
                        inc,
                        targetRgb.Length - inc);
                }
                inc += hash.Hash.Length;
            }
            return targetRgb;
        }

        // Convert the specified integer to the byte array.
        private void ConvertIntToByteArray(
            uint sourceInt,
            ref byte[] targetBytes)
        {
            uint remainder;
            int inc = 0;

            // Clear the array prior to filling it.
            Array.Clear(targetBytes, 0, targetBytes.Length);

            while (sourceInt > 0) 
            {
                remainder = sourceInt % 256;
                targetBytes[3 - inc] = (byte) remainder;
                sourceInt = (sourceInt - remainder)/256;
                inc++;
            }
        }
    }
// This class demonstrates how to create the MaskGenerator class 
// and call its GenerateMask member.
    class MaskGeneratorImpl
    {
      public static void Main(string[] args)
      {
          byte[] seed = new byte[] {0x01, 0x02, 0x03, 0x04};
          int length = 16;
          MaskGenerator maskGenerator = new MaskGenerator();
          byte[] mask = maskGenerator.GenerateMask(seed, length);
          Console.WriteLine("Generated the following mask:");
          Console.WriteLine(System.Text.Encoding.ASCII.GetString(mask));

          Console.WriteLine("This sample completed successfully; " +
                "press Enter to exit.");
          Console.ReadLine();
      }
  }
}
//
// This sample produces the following output:
//
// Generated the following mask:
// ?"TFd(?~OtO?
// This sample completed successfully; press Enter to exit.

Imports System.Security.Cryptography

Public Class MaskGenerator
    Inherits System.Security.Cryptography.MaskGenerationMethod

    Private HashNameValue As String

    ' Initialize a mask to encrypt using the SHA256 algorithm.
    Public Sub New()
        HashNameValue = "SHA256"
    End Sub

    ' Create a mask with the specified seed.
    Public Overrides Function GenerateMask( _
        ByVal seed() As Byte, _
        ByVal maskLength As Integer) As Byte()

        Dim hash As HashAlgorithm
        Dim rgbCounter(4) As Byte
        Dim targetRgb(maskLength) As Byte
        Dim counter As Integer

        For inc As Int16 = 0 To targetRgb.Length
            ConvertIntToByteArray(counter + 1, rgbCounter)
            hash = CType( _
                CryptoConfig.CreateFromName(HashNameValue), _
                HashAlgorithm)
            Dim temp(4 + seed.Length) As Byte
            Buffer.BlockCopy(rgbCounter, 0, temp, 0, 4)
            Buffer.BlockCopy(seed, 0, temp, 4, seed.Length)
            hash.ComputeHash(temp)

            If (targetRgb.Length - inc > hash.HashSize / 8) Then
                Buffer.BlockCopy( _
                    hash.Hash, 0, targetRgb, inc, hash.Hash.Length)
            Else
                Buffer.BlockCopy( _
                    hash.Hash, 0, targetRgb, inc, targetRgb.Length - inc)
            End If

            inc += hash.Hash.Length
        Next

        Return targetRgb
    End Function

    ' Convert the specified integer to the byte array.
    Private Sub ConvertIntToByteArray( _
        ByVal sourceInt As Integer, _
        ByRef targetBytes() As Byte)
        Dim remainder As Integer
        Dim inc As Int16 = 0

        ' Clear the array prior to filling it.
        Array.Clear(targetBytes, 0, targetBytes.Length)

        While (sourceInt > 0)
            remainder = sourceInt Mod 256
            targetBytes(3 - inc) = CType(remainder, Byte)
            sourceInt = (sourceInt - remainder) / 256
            inc = inc + 1
        End While
    End Sub
End Class

Public Class Form1
    Inherits System.Windows.Forms.Form

    ' Event handler for Run button.
    Private Sub Button1_Click( _
        ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles Button1.Click

        tbxOutput.Cursor = Cursors.WaitCursor
        tbxOutput.Text = ""

        Dim seed() As Byte = {&H1, &H2, &H3, &H4}
        Dim length As Int16 = 16
        Dim maskGenerator As New MaskGenerator
        Dim mask() As Byte = maskGenerator.GenerateMask(seed, length)

        tbxOutput.AppendText("Generated the following mask:")
        tbxOutput.AppendText(System.Text.Encoding.ASCII.GetString(mask))

        ' Align interface and conclude application.
        tbxOutput.AppendText(vbCrLf + "This sample completed" + _
            "successfully; press Exit to continue.")

        tbxOutput.Cursor = Cursors.Default
    End Sub
    ' Event handler for Exit button.
    Private Sub Button2_Click( _
        ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles Button2.Click

        Application.Exit()
    End Sub
#Region " Windows Form Designer generated code "

    Public Sub New()
        MyBase.New()

        'This call is required by the Windows Form Designer.
        InitializeComponent()

        'Add any initialization after the InitializeComponent() call

    End Sub

    'Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.IContainer

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.  
    'Do not modify it using the code editor.
    Friend WithEvents Panel2 As System.Windows.Forms.Panel
    Friend WithEvents Panel1 As System.Windows.Forms.Panel
    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents Button2 As System.Windows.Forms.Button
    Friend WithEvents tbxOutput As System.Windows.Forms.RichTextBox
    <System.Diagnostics.DebuggerStepThrough()> _
    Private Sub InitializeComponent()
        Me.Panel2 = New System.Windows.Forms.Panel
        Me.Button1 = New System.Windows.Forms.Button
        Me.Button2 = New System.Windows.Forms.Button
        Me.Panel1 = New System.Windows.Forms.Panel
        Me.tbxOutput = New System.Windows.Forms.RichTextBox
        Me.Panel2.SuspendLayout()
        Me.Panel1.SuspendLayout()
        Me.SuspendLayout()
        '
        'Panel2
        '
        Me.Panel2.Controls.Add(Me.Button1)
        Me.Panel2.Controls.Add(Me.Button2)
        Me.Panel2.Dock = System.Windows.Forms.DockStyle.Bottom
        Me.Panel2.DockPadding.All = 20
        Me.Panel2.Location = New System.Drawing.Point(0, 320)
        Me.Panel2.Name = "Panel2"
        Me.Panel2.Size = New System.Drawing.Size(616, 64)
        Me.Panel2.TabIndex = 1
        '
        'Button1
        '
        Me.Button1.Dock = System.Windows.Forms.DockStyle.Right
        Me.Button1.Font = New System.Drawing.Font( _
            "Microsoft Sans Serif", _
            9.0!, _
            System.Drawing.FontStyle.Regular, _
            System.Drawing.GraphicsUnit.Point, _
            CType(0, Byte))
        Me.Button1.Location = New System.Drawing.Point(446, 20)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(75, 24)
        Me.Button1.TabIndex = 2
        Me.Button1.Text = "&Run"
        '
        'Button2
        '
        Me.Button2.Dock = System.Windows.Forms.DockStyle.Right
        Me.Button2.Font = New System.Drawing.Font( _
            "Microsoft Sans Serif", _
            9.0!, _
            System.Drawing.FontStyle.Regular, _
            System.Drawing.GraphicsUnit.Point, _
            CType(0, Byte))
        Me.Button2.Location = New System.Drawing.Point(521, 20)
        Me.Button2.Name = "Button2"
        Me.Button2.Size = New System.Drawing.Size(75, 24)
        Me.Button2.TabIndex = 3
        Me.Button2.Text = "E&xit"
        '
        'Panel1
        '
        Me.Panel1.Controls.Add(Me.tbxOutput)
        Me.Panel1.Dock = System.Windows.Forms.DockStyle.Fill
        Me.Panel1.DockPadding.All = 20
        Me.Panel1.Location = New System.Drawing.Point(0, 0)
        Me.Panel1.Name = "Panel1"
        Me.Panel1.Size = New System.Drawing.Size(616, 320)
        Me.Panel1.TabIndex = 2
        '
        'tbxOutput
        '
        Me.tbxOutput.AccessibleDescription = _
            "Displays output from application."
        Me.tbxOutput.AccessibleName = "Output textbox."
        Me.tbxOutput.Dock = System.Windows.Forms.DockStyle.Fill
        Me.tbxOutput.Location = New System.Drawing.Point(20, 20)
        Me.tbxOutput.Name = "tbxOutput"
        Me.tbxOutput.Size = New System.Drawing.Size(576, 280)
        Me.tbxOutput.TabIndex = 1
        Me.tbxOutput.Text = "Click the Run button to run the application."
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 15)
        Me.ClientSize = New System.Drawing.Size(616, 384)
        Me.Controls.Add(Me.Panel1)
        Me.Controls.Add(Me.Panel2)
        Me.Name = "Form1"
        Me.Text = "MaskGenerationMethod"
        Me.Panel2.ResumeLayout(False)
        Me.Panel1.ResumeLayout(False)
        Me.ResumeLayout(False)

    End Sub

#End Region
End Class
'
' This sample produces the following output:
'
' Generated the following mask:~&*(uj98U(*UD989D
' This sample completedsuccessfully; press Exit to continue.

설명

OAEP(최적 비대칭 암호화 패딩)와 같은 주요 교환 알고리즘에 사용되는 컴퓨팅 마스크의 파생 클래스 MaskGenerationMethod 입니다.

이 클래스는 마스크 생성에 대해서만 키 교환 알고리즘의 구현에서 사용됩니다. 애플리케이션 코드에서이 클래스를 직접 사용 하지 않습니다.

생성자

MaskGenerationMethod()

MaskGenerationMethod 클래스의 새 인스턴스를 초기화합니다.

메서드

Equals(Object)	지정된 개체가 현재 개체와 같은지 확인합니다. (다음에서 상속됨 Object)
GenerateMask(Byte[], Int32)	파생 클래스에서 재정의된 경우 지정된 임의 초기값을 사용하여 지정된 길이로 마스크를 생성합니다.
GetHashCode()	기본 해시 함수로 작동합니다. (다음에서 상속됨 Object)
GetType()	현재 인스턴스의 Type을 가져옵니다. (다음에서 상속됨 Object)
MemberwiseClone()	현재 Object의 단순 복사본을 만듭니다. (다음에서 상속됨 Object)
ToString()	현재 개체를 나타내는 문자열을 반환합니다. (다음에서 상속됨 Object)