DESCryptoServiceProvider クラスとは? わかりやすく解説

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DESCryptoServiceProvider クラス

DES (Data Encryption Standard) アルゴリズム暗号サービス プロバイダ (CSP : Cryptographic Service Provider) バージョンアクセスするラッパー オブジェクト定義します。このクラス継承できません。

名前空間: System.Security.Cryptography
アセンブリ: mscorlib (mscorlib.dll 内)
構文構文

<ComVisibleAttribute(True)> _
Public NotInheritable Class
 DESCryptoServiceProvider
    Inherits DES
Dim instance As DESCryptoServiceProvider
[ComVisibleAttribute(true)] 
public sealed class DESCryptoServiceProvider
 : DES
[ComVisibleAttribute(true)] 
public ref class DESCryptoServiceProvider sealed
 : public DES
/** @attribute ComVisibleAttribute(true) */ 
public final class DESCryptoServiceProvider
 extends DES
ComVisibleAttribute(true) 
public final class DESCryptoServiceProvider
 extends DES
解説解説
使用例使用例

次に示す例では、DESCryptoServiceProvider クラス使用してデータ暗号化した後、そのデータ復号化ます。

' This sample demonstrates using a key based on the cryptographic service
 provider (CSP) version
' of the Data Encryption Standard (DES)algorithm to encrypt a string
 to a byte array, and then 
' to decrypt the byte array back to a string.
Imports System
Imports System.IO
Imports System.Text
Imports System.Security.Cryptography



Class CryptoMemoryStream
    
    ' Main method.
    Public Shared Sub Main()
        ' Create a new DES key.
        Dim key As New DESCryptoServiceProvider()
        
        ' Encrypt a string to a byte array.
        Dim buffer As Byte()
 = Encrypt("This is some plaintext!", key)
        
        ' Decrypt the byte array back to a string.
        Dim plaintext As String
 = Decrypt(buffer, key)
        
        ' Display the plaintext value to the console.
        Console.WriteLine(plaintext)
    End Sub 'Main
    
    
    ' Encrypt the string.
    Public Shared Function
 Encrypt(PlainText As String, key As
 SymmetricAlgorithm) As Byte()
        ' Create a memory stream.
        Dim ms As New MemoryStream()
        
        ' Create a CryptoStream using the memory stream and the 
        ' CSP DES key.  
        Dim encStream As New
 CryptoStream(ms, key.CreateEncryptor(), CryptoStreamMode.Write)
        
        ' Create a StreamWriter to write a string
        ' to the stream.
        Dim sw As New StreamWriter(encStream)
        
        ' Write the plaintext to the stream.
        sw.WriteLine(PlainText)
        
        ' Close the StreamWriter and CryptoStream.
        sw.Close()
        encStream.Close()
        
        ' Get an array of bytes that represents
        ' the memory stream.
        Dim buffer As Byte()
 = ms.ToArray()
        
        ' Close the memory stream.
        ms.Close()
        
        ' Return the encrypted byte array.
        Return buffer
    End Function 'Encrypt
    
    
    ' Decrypt the byte array.
    Public Shared Function
 Decrypt(CypherText() As Byte, key As
 SymmetricAlgorithm) As String
        ' Create a memory stream to the passed buffer.
        Dim ms As New MemoryStream(CypherText)
        
        ' Create a CryptoStream using the memory stream and the 
        ' CSP DES key. 
        Dim encStream As New
 CryptoStream(ms, key.CreateDecryptor(), CryptoStreamMode.Read)
        
        ' Create a StreamReader for reading the stream.
        Dim sr As New StreamReader(encStream)
        
        ' Read the stream as a string.
        Dim val As String
 = sr.ReadLine()
        
        ' Close the streams.
        sr.Close()
        encStream.Close()
        ms.Close()
        
        Return val
    End Function 'Decrypt
End Class 'CryptoMemoryStream
// This sample demonstrates using a key based on the cryptographic service
 provider (CSP) version
// of the Data Encryption Standard (DES)algorithm to encrypt a string
 to a byte array, and then 
// to decrypt the byte array back to a string.

using System;
using System.IO;
using System.Text;
using System.Security.Cryptography;

class CryptoMemoryStream
{
    // Main method.
    public static void Main()
    {
        // Create a new DES key.
        DESCryptoServiceProvider key = new DESCryptoServiceProvider();

        // Encrypt a string to a byte array.
        byte[] buffer = Encrypt("This is some plaintext!", key);

        // Decrypt the byte array back to a string.
        string plaintext =  Decrypt(buffer, key);

        // Display the plaintext value to the console.
        Console.WriteLine(plaintext);
    }
    
    // Encrypt the string.
    public static byte[] Encrypt(string
 PlainText, SymmetricAlgorithm key)
    {
        // Create a memory stream.
        MemoryStream ms = new MemoryStream();

        // Create a CryptoStream using the memory stream and the 
        // CSP DES key.  
        CryptoStream encStream = new CryptoStream(ms, key.CreateEncryptor(),
 CryptoStreamMode.Write);

        // Create a StreamWriter to write a string
        // to the stream.
        StreamWriter sw = new StreamWriter(encStream);

        // Write the plaintext to the stream.
        sw.WriteLine(PlainText);

        // Close the StreamWriter and CryptoStream.
        sw.Close();
        encStream.Close();

        // Get an array of bytes that represents
        // the memory stream.
        byte[] buffer = ms.ToArray();

        // Close the memory stream.
        ms.Close();

        // Return the encrypted byte array.
        return buffer;
    }

   // Decrypt the byte array.
    public static string
 Decrypt(byte[] CypherText, SymmetricAlgorithm key)
    {
        // Create a memory stream to the passed buffer.
        MemoryStream ms = new MemoryStream(CypherText);

        // Create a CryptoStream using the memory stream and the 
        // CSP DES key. 
        CryptoStream encStream = new CryptoStream(ms, key.CreateDecryptor(),
 CryptoStreamMode.Read);

        // Create a StreamReader for reading the stream.
        StreamReader sr = new StreamReader(encStream);

        // Read the stream as a string.
        string val = sr.ReadLine();

        // Close the streams.
        sr.Close();
        encStream.Close();
        ms.Close();
            
        return val;
    }
}
// This sample demonstrates using a key based on the cryptographic service
 provider (CSP) version
// of the Data Encryption Standard (DES)algorithm to encrypt a string
 to a byte array, and then 
// to decrypt the byte array back to a string.
using namespace System;
using namespace System::IO;
using namespace System::Text;
using namespace System::Security::Cryptography;

// Encrypt the string.
array<Byte>^ Encrypt( String^ PlainText, SymmetricAlgorithm^ key )
{
   
   // Create a memory stream.
   MemoryStream^ ms = gcnew MemoryStream;
   
   // Create a CryptoStream using the memory stream and the 
   // CSP DES key.  
   CryptoStream^ encStream = gcnew CryptoStream( ms,key->CreateEncryptor(),CryptoStreamMode::Write
 );
   
   // Create a StreamWriter to write a string
   // to the stream.
   StreamWriter^ sw = gcnew StreamWriter( encStream );
   
   // Write the plaintext to the stream.
   sw->WriteLine( PlainText );
   
   // Close the StreamWriter and CryptoStream.
   sw->Close();
   encStream->Close();
   
   // Get an array of bytes that represents
   // the memory stream.
   array<Byte>^buffer = ms->ToArray();
   
   // Close the memory stream.
   ms->Close();
   
   // Return the encrypted byte array.
   return buffer;
}


// Decrypt the byte array.
String^ Decrypt( array<Byte>^CypherText, SymmetricAlgorithm^ key )
{
   
   // Create a memory stream to the passed buffer.
   MemoryStream^ ms = gcnew MemoryStream( CypherText );
   
   // Create a CryptoStream using the memory stream and the 
   // CSP DES key. 
   CryptoStream^ encStream = gcnew CryptoStream( ms,key->CreateDecryptor(),CryptoStreamMode::Read
 );
   
   // Create a StreamReader for reading the stream.
   StreamReader^ sr = gcnew StreamReader( encStream );
   
   // Read the stream as a string.
   String^ val = sr->ReadLine();
   
   // Close the streams.
   sr->Close();
   encStream->Close();
   ms->Close();
   return val;
}

int main()
{
   
   // Create a new DES key.
   DESCryptoServiceProvider^ key = gcnew DESCryptoServiceProvider;
   
   // Encrypt a string to a byte array.
   array<Byte>^buffer = Encrypt( "This is some plaintext!", key );
   
   // Decrypt the byte array back to a string.
   String^ plaintext = Decrypt( buffer, key );
   
   // Display the plaintext value to the console.
   Console::WriteLine( plaintext );
}

// This sample demonstrates using a key based on the cryptographic 
// service provider (CSP) version
// of the Data Encryption Standard (DES)algorithm to encrypt a string
 
// to a byte array, and then to decrypt the byte array back to a string.

import System.*;
import System.IO.*;
import System.Text.*;
import System.Security.Cryptography.*;

class CryptoMemoryStream
{
    // main method.
    public static void main(String[]
 args)
    {
        // Create a new DES key.
        DESCryptoServiceProvider key = new DESCryptoServiceProvider();

        // Encrypt a string to a byte array.
        ubyte buffer[] = Encrypt("This is some plaintext!", key);

        // Decrypt the byte array back to a string.
        String plainText = Decrypt(buffer, key);

        // Display the plaintext value to the console.
        Console.WriteLine(plainText);
    } //main

    // Encrypt the string.
    public static ubyte[] Encrypt(String plainText,
 SymmetricAlgorithm key)
    {
        // Create a memory stream.
        MemoryStream ms = new MemoryStream();

        // Create a CryptoStream using the memory stream and the 
        // CSP DES key.  
        CryptoStream encStream = new CryptoStream(ms, key.CreateEncryptor(),
 
            CryptoStreamMode.Write);

        // Create a StreamWriter to write a string
        // to the stream.
        StreamWriter sw = new StreamWriter(encStream);

        // Write the plaintext to the stream.
        sw.WriteLine(plainText);

        // Close the StreamWriter and CryptoStream.
        sw.Close();
        encStream.Close();

        // Get an array of bytes that represents
        // the memory stream.
        ubyte buffer[] = ms.ToArray();

        // Close the memory stream.
        ms.Close();

        // Return the encrypted byte array.
        return buffer;
    } //Encrypt

    // Decrypt the byte array.
    public static String Decrypt(ubyte cypherText[],
 SymmetricAlgorithm key)
    {
        // Create a memory stream to the passed buffer.
        MemoryStream ms = new MemoryStream(cypherText);

        // Create a CryptoStream using the memory stream and the 
        // CSP DES key. 
        CryptoStream encStream = new CryptoStream(ms, key.CreateDecryptor(),
 
            CryptoStreamMode.Read);

        // Create a StreamReader for reading the stream.
        StreamReader sr = new StreamReader(encStream);

        // Read the stream as a string.
        String val = sr.ReadLine();

        // Close the streams.
        sr.Close();
        encStream.Close();
        ms.Close();
        return val;
    } //Decrypt
} //CryptoMemoryStream
継承階層継承階層
System.Object
   System.Security.Cryptography.SymmetricAlgorithm
     System.Security.Cryptography.DES
      System.Security.Cryptography.DESCryptoServiceProvider
スレッド セーフスレッド セーフ
この型の public static (Visual Basic では Shared) メンバはすべて、スレッド セーフです。インスタンス メンバ場合は、スレッド セーフであるとは限りません。
プラットフォームプラットフォーム
バージョン情報バージョン情報
参照参照
関連項目
DESCryptoServiceProvider メンバ
System.Security.Cryptography 名前空間
その他の技術情報
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