X509Certificate2.SignatureAlgorithm プロパティ

.NET Framework クラス ライブラリ リファレンス

X509Certificate2.SignatureAlgorithm プロパティ

メモ : このプロパティは、.NET Framework version 2.0 で新しく追加されたものです。

証明書の署名を作成するために使用するアルゴリズムを取得します。

名前空間: System.Security.Cryptography.X509Certificates
アセンブリ: System (system.dll 内)
構文

Visual Basic (宣言)

Public ReadOnly Property
 SignatureAlgorithm As Oid

Visual Basic (使用法)

Dim instance As X509Certificate2
Dim value As Oid

value = instance.SignatureAlgorithm

C#

public Oid SignatureAlgorithm { get; }

C++

public:
property Oid^ SignatureAlgorithm {
    Oid^ get ();
}

J#

/** @property */
public Oid get_SignatureAlgorithm ()

JScript

public function get SignatureAlgorithm
 () : Oid

プロパティ値
署名アルゴリズムのオブジェクト識別子 (Oid) を返します。

例外

例外の種類	条件
CryptographicException	証明書を読み取ることができません。

解説

オブジェクト識別子 (Oid) は、証明書で使用する署名アルゴリズムの種類を示します。

使用例

現在のユーザーの証明書ストアを開いて、アクティブな証明書だけを選択し、ユーザーが 1 つ以上の証明書を選択できるようにするコード例を次に示します。この例では、次に、証明書情報をコンソールに書き込みます。

C#

using System;
using System.Security.Cryptography;
using System.Security.Permissions;
using System.IO;
using System.Security.Cryptography.X509Certificates;

class CertSelect
{
    static void Main()
    {
        try
        {
            X509Store store = new X509Store("MY",StoreLocation.CurrentUser);
            store.Open(OpenFlags.ReadOnly | OpenFlags.OpenExistingOnly);
            X509Certificate2Collection collection = (X509Certificate2Collection)store.Certificates;
            X509Certificate2Collection fcollection = (X509Certificate2Collection)collection.Find(X509FindType.FindByTimeValid
,DateTime.Now,false);
            X509Certificate2Collection scollection = X509Certificate2UI.SelectFromCollection(fcollection,
 "Test Certificate Select","Select a certificate from the following
 list to get information on that certificate",X509SelectionFlag.MultiSelection);
            Console.WriteLine("Number of certificates: {0}{1}",scollection.Count
,Environment.NewLine);
                foreach (X509Certificate2 x509 in
 scollection)
                {
                    byte[] rawdata = x509.RawData;
                    Console.WriteLine("Content Type: {0}{1}",X509Certificate2.GetCertContentType(rawdata)
,Environment.NewLine);
                    Console.WriteLine("Friendly Name: {0}{1}",x509.FriendlyName
,Environment.NewLine);
                    Console.WriteLine("Certificate Verified?: {0}{1}",x509.Verify()
,Environment.NewLine);
                    Console.WriteLine("Simple Name: {0}{1}",x509.GetNameInfo(X509NameType.SimpleName
,true),Environment.NewLine);
                    Console.WriteLine("Signature Algorithm: {0}{1}",x509.SignatureAlgorithm.FriendlyName
,Environment.NewLine);
                    Console.WriteLine("Private Key: {0}{1}",x509.PrivateKey.ToXmlString(false)
,Environment.NewLine);
                    Console.WriteLine("Public Key: {0}{1}",x509.PublicKey.Key.ToXmlString(false)
,Environment.NewLine);
                    Console.WriteLine("Certificate Archived?: {0}{1}",x509.Archived
,Environment.NewLine);
                    Console.WriteLine("Length of Raw Data: {0}{1}",x509.RawData.Length
,Environment.NewLine);
                    X509Certificate2UI.DisplayCertificate(x509);
                    x509.Reset();
                }
            store.Close();
            }
        catch (CryptographicException)
            {
                   Console.WriteLine("Information could not be written out for
 this certificate.");
            }
        
    }
}

C++

#using <System.dll>
#using <System.Security.dll>

using namespace System;
using namespace System::Security::Cryptography;
using namespace System::Security::Permissions;
using namespace System::IO;
using namespace System::Security::Cryptography::X509Certificates;
int main()
{
   try
   {
      X509Store ^ store = gcnew X509Store( "MY",StoreLocation::CurrentUser
 );
      store->Open( static_cast<OpenFlags>(OpenFlags::ReadOnly | OpenFlags::OpenExistingOnly)
 );
      X509Certificate2Collection ^ collection = dynamic_cast<X509Certificate2Collection^>(store->Certificates);
      X509Certificate2Collection ^ fcollection = dynamic_cast<X509Certificate2Collection^>(collection->Find(
 X509FindType::FindByTimeValid, DateTime::Now, false ));
      X509Certificate2Collection ^ scollection = X509Certificate2UI::SelectFromCollection(fcollection,
 "Test Certificate Select","Select a certificate from the following
 list to get information on that certificate",X509SelectionFlag::MultiSelection);
      Console::WriteLine( "Number of certificates: {0}{1}", scollection->Count,
 Environment::NewLine );
      System::Collections::IEnumerator^ myEnum = scollection->GetEnumerator();
      while ( myEnum->MoveNext() )
      {
         X509Certificate2 ^ x509 = safe_cast<X509Certificate2 ^>(myEnum->Current);
         array<Byte>^rawdata = x509->RawData;
         Console::WriteLine( "Content Type: {0}{1}", X509Certificate2::GetCertContentType(
 rawdata ), Environment::NewLine );
         Console::WriteLine( "Friendly Name: {0}{1}", x509->FriendlyName,
 Environment::NewLine );
         Console::WriteLine( "Certificate Verified?: {0}{1}", x509->Verify(),
 Environment::NewLine );
         Console::WriteLine( "Simple Name: {0}{1}", x509->GetNameInfo(
 X509NameType::SimpleName, true ), Environment::NewLine );
         Console::WriteLine( "Signature Algorithm: {0}{1}", x509->SignatureAlgorithm->FriendlyName,
 Environment::NewLine );
         Console::WriteLine( "Private Key: {0}{1}", x509->PrivateKey->ToXmlString(
 false ), Environment::NewLine );
         Console::WriteLine( "Public Key: {0}{1}", x509->PublicKey->Key->ToXmlString(
 false ), Environment::NewLine );
         Console::WriteLine( "Certificate Archived?: {0}{1}", x509->Archived,
 Environment::NewLine );
         Console::WriteLine( "Length of Raw Data: {0}{1}", x509->RawData->Length,
 Environment::NewLine );
         x509->Reset();
      }
      store->Close();
   }
   catch ( CryptographicException^ ) 
   {
      Console::WriteLine( "Information could not be written out for
 this certificate." );
   }

}

プラットフォーム

Windows 98, Windows 2000 SP4, Windows Millennium Edition, 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

参照

関連項目
X509Certificate2 クラス
X509Certificate2 メンバ
System.Security.Cryptography.X509Certificates 名前空間