DSASignatureDeformatter.SetHashAlgorithm メソッド

デジタル署名アルゴリズム (DSA) 署名逆フォーマッタのハッシュ アルゴリズムを指定します。

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
  署名逆フォーマッタで使用するハッシュ アルゴリズムの名前。

例外

例外の種類	条件
CryptographicUnexpectedOperationException	strName パラメータが、 SHA1 ハッシュ アルゴリズムに割り当てられません。

解説

実装時の注意: このメソッドは使用されません。 DSA アルゴリズムは SHA1 ハッシュ アルゴリズムを必要とします。

使用例

 
Imports System
Imports System.Security.Cryptography

 _

Class DSASample


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

            '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 DSASignatureFormatter object and pass it the 
            'DSACryptoServiceProvider to transfer the key information.
            Dim DSAFormatter As New DSASignatureFormatter(DSA)

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

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

            'Create an DSASignatureDeformatter object and pass it the 
            'DSACryptoServiceProvider to transfer the key information.
            Dim DSADeformatter As New DSASignatureDeformatter(DSA)

            'Verify the hash and display the results to the console.
            If DSADeformatter.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 DSASample
{
        
    static void Main()
    {
        try
        {
            //Create a new instance of DSACryptoServiceProvider.
            DSACryptoServiceProvider DSA = new DSACryptoServiceProvider();

            //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 DSASignatureFormatter object and pass it the 
            //DSACryptoServiceProvider to transfer the key information.
            DSASignatureFormatter DSAFormatter = new DSASignatureFormatter(DSA);

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

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

            //Create an DSASignatureDeformatter object and pass it the 
            //DSACryptoServiceProvider to transfer the key information.
            DSASignatureDeformatter DSADeformatter = new DSASignatureDeformatter(DSA);

            //Verify the hash and display the results to the console.
            if(DSADeformatter.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;

void main() {
    try {
        //Create a new instance of DSACryptoServiceProvider.
        DSACryptoServiceProvider* DSA = new DSACryptoServiceProvider();

        //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 DSASignatureFormatter object and pass it the 
        //DSACryptoServiceProvider to transfer the key information.
        DSASignatureFormatter* DSAFormatter = new DSASignatureFormatter(DSA);

        //Set the hash algorithm to SHA1.
        DSAFormatter->SetHashAlgorithm(S"SHA1");

        //Create a signature for HashValue and return it.
        Byte SignedHash[] = DSAFormatter->CreateSignature(Hash);

        //Create an DSASignatureDeformatter object and pass it the 
        //DSACryptoServiceProvider to transfer the key information.
        DSASignatureDeformatter* DSADeformatter = new DSASignatureDeformatter(DSA);

        //Verify the hash and display the results to the console.
        if (DSADeformatter->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);
    }
}

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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

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