RSAPKCS1SignatureDeformatter.SetHashAlgorithm メソッド

.NET Framework クラス ライブラリ リファレンス

RSAPKCS1SignatureDeformatter.SetHashAlgorithm メソッド

署名の検証に使用するハッシュ アルゴリズムを設定します。

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

Visual Basic (宣言)

Public Overrides Sub SetHashAlgorithm
 ( _
    strName As String _
)

Visual Basic (使用法)

Dim instance As RSAPKCS1SignatureDeformatter
Dim strName As String

instance.SetHashAlgorithm(strName)

C#

public override void SetHashAlgorithm (
    string strName
)

C++

public:
virtual void SetHashAlgorithm (
    String^ strName
) override

J#

public void SetHashAlgorithm (
    String strName
)

JScript

public override function SetHashAlgorithm (
    strName : String
)

パラメータ

strName

署名の検証に使用するハッシュ アルゴリズムの名前。

解説

VerifySignature を呼び出す前に、ハッシュ アルゴリズムを設定する必要があります。

使用例

RSAPKCS1SignatureFormatter クラスを使用してデジタル署名を作成した後、RSAPKCS1SignatureDeformatter クラスを使用してその署名を検証する方法を次のコード例に示します。

Visual Basic

Imports System
Imports System.Security.Cryptography

 _

Class RSASample


    Shared Sub Main()
        Try
            'Create a new instance of RSACryptoServiceProvider.
            Dim RSA As New
 RSACryptoServiceProvider()

            'The hash to sign.
            Dim Hash As Byte()
 = {59, 4, 248, 102, 77, 97, 142, 201, 210, 12, 224, 93, 25, 41, 100, 197, 213,
 134, 130, 135}

            'Create an RSAOPKCS1SignatureFormatter object and pass it
 the 
            'RSACryptoServiceProvider to transfer the key information.
            Dim RSAFormatter As New
 RSAPKCS1SignatureFormatter(RSA)

            'Set the hash algorithm to SHA1.
            RSAFormatter.SetHashAlgorithm("SHA1")

            'Create a signature for HashValue and return it.
            Dim SignedHash As Byte()
 = RSAFormatter.CreateSignature(Hash)

            'Create an RSAPKCS1SignatureDeformatter object and pass
 it the 
            'RSACryptoServiceProvider to transfer the key information.
            Dim RSADeformatter As New
 RSAPKCS1SignatureDeformatter(RSA)

            RSADeformatter.SetHashAlgorithm("SHA1")

            'Verify the hash and display the results to the console.
            If RSADeformatter.VerifySignature(Hash, SignedHash)
 Then
                Console.WriteLine("The signature was verified.")
            Else
                Console.WriteLine("The signature was not verified.")
            End If

        Catch e As CryptographicException
            Console.WriteLine(e.Message)
        End Try
    End Sub
End Class

C#

using System;
using System.Security.Cryptography;

class RSASample
{
        
    static void Main()
    {
        try
        {
            //Create a new instance of RSACryptoServiceProvider.
            RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();

            //The hash to sign.
            byte[] Hash = {59,4,248,102,77,97,142,201,210,12,224,93,25,41,100,197
,213,134,130,135};

            //Create an RSAOPKCS1SignatureFormatter object and pass
 it the 
            //RSACryptoServiceProvider to transfer the key information.
            RSAPKCS1SignatureFormatter RSAFormatter = new RSAPKCS1SignatureFormatter(RSA);

            //Set the hash algorithm to SHA1.
            RSAFormatter.SetHashAlgorithm("SHA1");

            //Create a signature for HashValue and return it.
            byte[] SignedHash = RSAFormatter.CreateSignature(Hash);

            //Create an RSAPKCS1SignatureDeformatter object and pass
 it the 
            //RSACryptoServiceProvider to transfer the key information.
            RSAPKCS1SignatureDeformatter RSADeformatter = new
 RSAPKCS1SignatureDeformatter(RSA);

            RSADeformatter.SetHashAlgorithm("SHA1");

            //Verify the hash and display the results to the console.
            if(RSADeformatter.VerifySignature(Hash, SignedHash))
            {
                Console.WriteLine("The signature was verified.");
            }
            else
            {
                Console.WriteLine("The signature was not verified.");
            }

        }
        catch(CryptographicException e)
        {
            Console.WriteLine(e.Message);
        }
    }

}

C++

#using <System.dll>

using namespace System;
using namespace System::Security::Cryptography;
int main()
{
   try
   {
      
      //Create a new instance of RSACryptoServiceProvider.
      RSACryptoServiceProvider^ RSA = gcnew RSACryptoServiceProvider;
      
      //The hash to sign.
      array<Byte>^Hash = {59,4,248,102,77,97,142,201,210,12,224,93,25,41,100
,197,213,134,130,135};
      
      //Create an RSAOPKCS1SignatureFormatter object and pass it the
 
      //RSACryptoServiceProvider to transfer the key information.
      RSAPKCS1SignatureFormatter^ RSAFormatter = gcnew RSAPKCS1SignatureFormatter(
 RSA );
      
      //Set the hash algorithm to SHA1.
      RSAFormatter->SetHashAlgorithm( "SHA1" );
      
      //Create a signature for HashValue and return it.
      array<Byte>^SignedHash = RSAFormatter->CreateSignature( Hash );
      
      //Create an RSAPKCS1SignatureDeformatter object and pass it the
 
      //RSACryptoServiceProvider to transfer the key information.
      RSAPKCS1SignatureDeformatter^ RSADeformatter = gcnew RSAPKCS1SignatureDeformatter(
 RSA );
      RSADeformatter->SetHashAlgorithm( "SHA1" );
      
      //Verify the hash and display the results to the console.
      if ( RSADeformatter->VerifySignature( Hash, SignedHash
 ) )
      {
         Console::WriteLine( "The signature was verified." );
      }
      else
      {
         Console::WriteLine( "The signature was not verified." );
      }
   }
   catch ( CryptographicException^ e ) 
   {
      Console::WriteLine( e->Message );
   }

}

J#

import System.*;
import System.Security.Cryptography.*;

class RSASample
{
    public static void main(String[]
 args)
    {
        try {
            // Create a new instance of RSACryptoServiceProvider.
            RSACryptoServiceProvider rsa =  new RSACryptoServiceProvider();
            
            //The hash to sign.
            ubyte hash[] =  {59, 4, 248, 102, 77, 97, 142, 201, 210, 12, 224, 
                93, 25, 41, 100, 197, 213, 134, 130, 135};
            
            // Create an RSAOPKCS1SignatureFormatter object and pass
 it the 
            // RSACryptoServiceProvider to transfer the key information.
            RSAPKCS1SignatureFormatter rsaFormatter =  
                new RSAPKCS1SignatureFormatter(rsa);
            
            // Set the hash algorithm to SHA1.
            rsaFormatter.SetHashAlgorithm("SHA1");
            
            // Create a signature for HashValue and return it.
            ubyte signedHash[] = rsaFormatter.CreateSignature(hash);
            
            // Create an RSAPKCS1SignatureDeformatter object and pass
 it the 
            // RSACryptoServiceProvider to transfer the key information.
            RSAPKCS1SignatureDeformatter rsaDeformatter =  
                new RSAPKCS1SignatureDeformatter(rsa);
            
            rsaDeformatter.SetHashAlgorithm("SHA1");
            
            // Verify the hash and display the results to the console.
            if (rsaDeformatter.VerifySignature(hash, signedHash))
 {
                Console.WriteLine("The signature was verified.");
            }
            else {
                Console.WriteLine("The signature was not verified.");
            }
        } 
        catch (CryptographicException e) {
            Console.WriteLine(e.get_Message());
        }
    } //main
} //RSASample

プラットフォーム

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報

.NET Framework
サポート対象 : 2.0、1.1、1.0
.NET Compact Framework
サポート対象 : 2.0

参照

関連項目
RSAPKCS1SignatureDeformatter クラス
RSAPKCS1SignatureDeformatter メンバ
System.Security.Cryptography 名前空間
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