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。

Overrides Public Sub SetHashAlgorithm( _
   ByVal strName As String _)
[C#]
public override void SetHashAlgorithm(stringstrName);
[C++]
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

 
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 <mscorlib.dll>
#using <System.dll>

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

int 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(S"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(S"SHA1");

        //Verify the hash and display the results to the console.
        if (RSADeformatter->VerifySignature(Hash, SignedHash)) {
            Console::WriteLine(S"The signature was verified.");
        } else {
            Console::WriteLine(S"The signature was not verified.");
        }
    } catch (CryptographicException* e) {
        Console::WriteLine(e->Message);
    }
}

[JScript] JScript のサンプルはありません。Visual Basic、C#、および C++ のサンプルを表示するには、このページの左上隅にある言語のフィルタ ボタン をクリックします。

必要条件

プラットフォーム: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 ファミリ

参照

RSAPKCS1SignatureDeformatter クラス | RSAPKCS1SignatureDeformatter メンバ | System.Security.Cryptography 名前空間 | 暗号サービス