X509Extension クラス
アセンブリ: System (system.dll 内)


X509 の拡張機能は、X509 証明書に追加したり、変更したりできる動的な拡張プロパティです。X509Extension クラスを使用すると、証明機関 (CA) によって発行される証明書には含まれていない機能を、証明書に関連付けられた拡張機能として作成できます。
最も基本的な形態の X509 拡張機能には、オブジェクト識別子 (OID)、その拡張機能をクリティカルと見なすかどうかを表すブール値、および ASN でエンコードされたデータが含まれています。カスタムの拡張機能は、CryptoConfig ファイルに登録できます。

X509Extension クラスを使用するコード例を次に示します。
Imports System Imports System.Security.Cryptography Imports System.Security.Cryptography.X509Certificates Module CertSelect Sub Main() Try Dim store As New X509Store("MY", StoreLocation.CurrentUser) store.Open(OpenFlags.ReadOnly Or OpenFlags.OpenExistingOnly) Dim collection As X509Certificate2Collection = CType(store.Certificates, X509Certificate2Collection) Dim i As Integer For i = 0 To collection.Count Dim extension As X509Extension For Each extension In collection(i).Extensions Console.WriteLine(extension.Oid.FriendlyName + "(" + extension.Oid.Value + ")") If extension.Oid.FriendlyName = "Key Usage" Then Dim ext As X509KeyUsageExtension = CType(extension, X509KeyUsageExtension) Console.WriteLine(ext.KeyUsages) End If If extension.Oid.FriendlyName = "Basic Constraints" Then Dim ext As X509BasicConstraintsExtension = CType(extension, X509BasicConstraintsExtension) Console.WriteLine(ext.CertificateAuthority) Console.WriteLine(ext.HasPathLengthConstraint) Console.WriteLine(ext.PathLengthConstraint) End If If extension.Oid.FriendlyName = "Subject Key Identifier" Then Dim ext As X509SubjectKeyIdentifierExtension = CType(extension, X509SubjectKeyIdentifierExtension) Console.WriteLine(ext.SubjectKeyIdentifier) End If If extension.Oid.FriendlyName = "Enhanced Key Usage" Then Dim ext As X509EnhancedKeyUsageExtension = CType(extension, X509EnhancedKeyUsageExtension) Dim oids As OidCollection = ext.EnhancedKeyUsages Dim oid As Oid For Each oid In oids Console.WriteLine(oid.FriendlyName + "(" + oid.Value + ")") Next oid End If Next extension Next i store.Close() Catch Console.WriteLine("Information could not be written out for this certificate.") End Try End Sub End Module
using System; using System.Security.Cryptography; using System.Security.Cryptography.X509Certificates; public class CertSelect { public static void Main() { try { X509Store store = new X509Store("MY", StoreLocation.CurrentUser); store.Open(OpenFlags.ReadOnly | OpenFlags.OpenExistingOnly); X509Certificate2Collection collection = (X509Certificate2Collection)store.Certificates; for (int i = 0; i < collection.Count; i++) { foreach (X509Extension extension in collection[i].Extensions) { Console.WriteLine(extension.Oid.FriendlyName + "(" + extension.Oid.Value + ")"); if (extension.Oid.FriendlyName == "Key Usage") { X509KeyUsageExtension ext = (X509KeyUsageExtension)extension; Console.WriteLine(ext.KeyUsages); } if (extension.Oid.FriendlyName == "Basic Constraints") { X509BasicConstraintsExtension ext = (X509BasicConstraintsExtension)extension; Console.WriteLine(ext.CertificateAuthority); Console.WriteLine(ext.HasPathLengthConstraint); Console.WriteLine(ext.PathLengthConstraint); } if (extension.Oid.FriendlyName == "Subject Key Identifier") { X509SubjectKeyIdentifierExtension ext = (X509SubjectKeyIdentifierExtension)extension; Console.WriteLine(ext.SubjectKeyIdentifier); } if (extension.Oid.FriendlyName == "Enhanced Key Usage") { X509EnhancedKeyUsageExtension ext = (X509EnhancedKeyUsageExtension)extension; OidCollection oids = ext.EnhancedKeyUsages; foreach (Oid oid in oids) { Console.WriteLine(oid.FriendlyName + "(" + oid.Value + ")"); } } } } store.Close(); } catch (CryptographicException) { Console.WriteLine("Information could not be written out for this certificate."); } } }
#using <System.dll> #using <system.security.dll> using namespace System; using namespace System::Security::Cryptography; using namespace System::Security::Cryptography::X509Certificates; int main() { try { X509Store^ store = gcnew X509Store( L"MY",StoreLocation::CurrentUser ); store->Open( static_cast<OpenFlags>(OpenFlags::ReadOnly | OpenFlags::OpenExistingOnly) ); X509Certificate2Collection^ collection = dynamic_cast<X509Certificate2Collection^>(store->Certificates); for ( int i = 0; i < collection->Count; i++ ) { System::Collections::IEnumerator^ myEnum = collection[ i ]->Extensions->GetEnumerator(); while ( myEnum->MoveNext() ) { X509Extension^ extension = safe_cast<X509Extension^>(myEnum->Current); Console::WriteLine( L"{0}({1})", extension->Oid->FriendlyName, extension->Oid->Value ); if ( extension->Oid->FriendlyName == L"Key Usage" ) { X509KeyUsageExtension^ ext = dynamic_cast<X509KeyUsageExtension^>(extension); Console::WriteLine( ext->KeyUsages ); } if ( extension->Oid->FriendlyName == L"Basic Constraints" ) { X509BasicConstraintsExtension^ ext = dynamic_cast<X509BasicConstraintsExtension^>(extension); Console::WriteLine( ext->CertificateAuthority ); Console::WriteLine( ext->HasPathLengthConstraint ); Console::WriteLine( ext->PathLengthConstraint ); } if ( extension->Oid->FriendlyName == L"Subject Key Identifier" ) { X509SubjectKeyIdentifierExtension^ ext = dynamic_cast<X509SubjectKeyIdentifierExtension^>(extension); Console::WriteLine( ext->SubjectKeyIdentifier ); } if ( extension->Oid->FriendlyName == L"Enhanced Key Usage" ) { X509EnhancedKeyUsageExtension^ ext = dynamic_cast<X509EnhancedKeyUsageExtension^>(extension); OidCollection^ oids = ext->EnhancedKeyUsages; System::Collections::IEnumerator^ myEnum1 = oids->GetEnumerator(); while ( myEnum1->MoveNext() ) { Oid^ oid = safe_cast<Oid^>(myEnum1->Current); Console::WriteLine( L"{0}({1})", oid->FriendlyName, oid->Value ); } } } } store->Close(); } catch ( CryptographicException^ ) { Console::WriteLine( L"Information could not be written out for this certificate." ); } }

System.Security.Cryptography.AsnEncodedData
System.Security.Cryptography.X509Certificates.X509Extension
System.Security.Cryptography.X509Certificates.X509BasicConstraintsExtension
System.Security.Cryptography.X509Certificates.X509EnhancedKeyUsageExtension
System.Security.Cryptography.X509Certificates.X509KeyUsageExtension
System.Security.Cryptography.X509Certificates.X509SubjectKeyIdentifierExtension


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。


X509Extension コンストラクタ ()
アセンブリ: System (system.dll 内)


このクラスの他のコンストラクタが、バイト配列、ポインタ、証明書ファイルのいずれかから証明書情報を取得してオブジェクトを作成するのに対し、このコンストラクタは、空の X509Extension オブジェクトを作成します。

X509Extension クラスを使用するコード例を次に示します。
Imports System Imports System.Security.Cryptography Imports System.Security.Cryptography.X509Certificates Module CertSelect Sub Main() Try Dim store As New X509Store("MY", StoreLocation.CurrentUser) store.Open(OpenFlags.ReadOnly Or OpenFlags.OpenExistingOnly) Dim collection As X509Certificate2Collection = CType(store.Certificates, X509Certificate2Collection) Dim i As Integer For i = 0 To collection.Count Dim extension As X509Extension For Each extension In collection(i).Extensions Console.WriteLine(extension.Oid.FriendlyName + "(" + extension.Oid.Value + ")") If extension.Oid.FriendlyName = "Key Usage" Then Dim ext As X509KeyUsageExtension = CType(extension, X509KeyUsageExtension) Console.WriteLine(ext.KeyUsages) End If If extension.Oid.FriendlyName = "Basic Constraints" Then Dim ext As X509BasicConstraintsExtension = CType(extension, X509BasicConstraintsExtension) Console.WriteLine(ext.CertificateAuthority) Console.WriteLine(ext.HasPathLengthConstraint) Console.WriteLine(ext.PathLengthConstraint) End If If extension.Oid.FriendlyName = "Subject Key Identifier" Then Dim ext As X509SubjectKeyIdentifierExtension = CType(extension, X509SubjectKeyIdentifierExtension) Console.WriteLine(ext.SubjectKeyIdentifier) End If If extension.Oid.FriendlyName = "Enhanced Key Usage" Then Dim ext As X509EnhancedKeyUsageExtension = CType(extension, X509EnhancedKeyUsageExtension) Dim oids As OidCollection = ext.EnhancedKeyUsages Dim oid As Oid For Each oid In oids Console.WriteLine(oid.FriendlyName + "(" + oid.Value + ")") Next oid End If Next extension Next i store.Close() Catch Console.WriteLine("Information could not be written out for this certificate.") End Try End Sub End Module
using System; using System.Security.Cryptography; using System.Security.Cryptography.X509Certificates; public class CertSelect { public static void Main() { try { X509Store store = new X509Store("MY", StoreLocation.CurrentUser); store.Open(OpenFlags.ReadOnly | OpenFlags.OpenExistingOnly); X509Certificate2Collection collection = (X509Certificate2Collection)store.Certificates; for (int i = 0; i < collection.Count; i++) { foreach (X509Extension extension in collection[i].Extensions) { Console.WriteLine(extension.Oid.FriendlyName + "(" + extension.Oid.Value + ")"); if (extension.Oid.FriendlyName == "Key Usage") { X509KeyUsageExtension ext = (X509KeyUsageExtension)extension; Console.WriteLine(ext.KeyUsages); } if (extension.Oid.FriendlyName == "Basic Constraints") { X509BasicConstraintsExtension ext = (X509BasicConstraintsExtension)extension; Console.WriteLine(ext.CertificateAuthority); Console.WriteLine(ext.HasPathLengthConstraint); Console.WriteLine(ext.PathLengthConstraint); } if (extension.Oid.FriendlyName == "Subject Key Identifier") { X509SubjectKeyIdentifierExtension ext = (X509SubjectKeyIdentifierExtension)extension; Console.WriteLine(ext.SubjectKeyIdentifier); } if (extension.Oid.FriendlyName == "Enhanced Key Usage") { X509EnhancedKeyUsageExtension ext = (X509EnhancedKeyUsageExtension)extension; OidCollection oids = ext.EnhancedKeyUsages; foreach (Oid oid in oids) { Console.WriteLine(oid.FriendlyName + "(" + oid.Value + ")"); } } } } store.Close(); } catch (CryptographicException) { Console.WriteLine("Information could not be written out for this certificate."); } } }
#using <System.dll> #using <system.security.dll> using namespace System; using namespace System::Security::Cryptography; using namespace System::Security::Cryptography::X509Certificates; int main() { try { X509Store^ store = gcnew X509Store( L"MY",StoreLocation::CurrentUser ); store->Open( static_cast<OpenFlags>(OpenFlags::ReadOnly | OpenFlags::OpenExistingOnly) ); X509Certificate2Collection^ collection = dynamic_cast<X509Certificate2Collection^>(store->Certificates); for ( int i = 0; i < collection->Count; i++ ) { System::Collections::IEnumerator^ myEnum = collection[ i ]->Extensions->GetEnumerator(); while ( myEnum->MoveNext() ) { X509Extension^ extension = safe_cast<X509Extension^>(myEnum->Current); Console::WriteLine( L"{0}({1})", extension->Oid->FriendlyName, extension->Oid->Value ); if ( extension->Oid->FriendlyName == L"Key Usage" ) { X509KeyUsageExtension^ ext = dynamic_cast<X509KeyUsageExtension^>(extension); Console::WriteLine( ext->KeyUsages ); } if ( extension->Oid->FriendlyName == L"Basic Constraints" ) { X509BasicConstraintsExtension^ ext = dynamic_cast<X509BasicConstraintsExtension^>(extension); Console::WriteLine( ext->CertificateAuthority ); Console::WriteLine( ext->HasPathLengthConstraint ); Console::WriteLine( ext->PathLengthConstraint ); } if ( extension->Oid->FriendlyName == L"Subject Key Identifier" ) { X509SubjectKeyIdentifierExtension^ ext = dynamic_cast<X509SubjectKeyIdentifierExtension^>(extension); Console::WriteLine( ext->SubjectKeyIdentifier ); } if ( extension->Oid->FriendlyName == L"Enhanced Key Usage" ) { X509EnhancedKeyUsageExtension^ ext = dynamic_cast<X509EnhancedKeyUsageExtension^>(extension); OidCollection^ oids = ext->EnhancedKeyUsages; System::Collections::IEnumerator^ myEnum1 = oids->GetEnumerator(); while ( myEnum1->MoveNext() ) { Oid^ oid = safe_cast<Oid^>(myEnum1->Current); Console::WriteLine( L"{0}({1})", oid->FriendlyName, oid->Value ); } } } } store->Close(); } catch ( CryptographicException^ ) { Console::WriteLine( L"Information could not be written out for this certificate." ); } }

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。


X509Extension コンストラクタ (String, Byte[], Boolean)
アセンブリ: System (system.dll 内)

Dim oid As String Dim rawData As Byte() Dim critical As Boolean Dim instance As New X509Extension(oid, rawData, critical)


X509Extension クラスを使用するコード例を次に示します。
Imports System Imports System.Security.Cryptography Imports System.Security.Cryptography.X509Certificates Module CertSelect Sub Main() Try Dim store As New X509Store("MY", StoreLocation.CurrentUser) store.Open(OpenFlags.ReadOnly Or OpenFlags.OpenExistingOnly) Dim collection As X509Certificate2Collection = CType(store.Certificates, X509Certificate2Collection) Dim i As Integer For i = 0 To collection.Count Dim extension As X509Extension For Each extension In collection(i).Extensions Console.WriteLine(extension.Oid.FriendlyName + "(" + extension.Oid.Value + ")") If extension.Oid.FriendlyName = "Key Usage" Then Dim ext As X509KeyUsageExtension = CType(extension, X509KeyUsageExtension) Console.WriteLine(ext.KeyUsages) End If If extension.Oid.FriendlyName = "Basic Constraints" Then Dim ext As X509BasicConstraintsExtension = CType(extension, X509BasicConstraintsExtension) Console.WriteLine(ext.CertificateAuthority) Console.WriteLine(ext.HasPathLengthConstraint) Console.WriteLine(ext.PathLengthConstraint) End If If extension.Oid.FriendlyName = "Subject Key Identifier" Then Dim ext As X509SubjectKeyIdentifierExtension = CType(extension, X509SubjectKeyIdentifierExtension) Console.WriteLine(ext.SubjectKeyIdentifier) End If If extension.Oid.FriendlyName = "Enhanced Key Usage" Then Dim ext As X509EnhancedKeyUsageExtension = CType(extension, X509EnhancedKeyUsageExtension) Dim oids As OidCollection = ext.EnhancedKeyUsages Dim oid As Oid For Each oid In oids Console.WriteLine(oid.FriendlyName + "(" + oid.Value + ")") Next oid End If Next extension Next i store.Close() Catch Console.WriteLine("Information could not be written out for this certificate.") End Try End Sub End Module
using System; using System.Security.Cryptography; using System.Security.Cryptography.X509Certificates; public class CertSelect { public static void Main() { try { X509Store store = new X509Store("MY", StoreLocation.CurrentUser); store.Open(OpenFlags.ReadOnly | OpenFlags.OpenExistingOnly); X509Certificate2Collection collection = (X509Certificate2Collection)store.Certificates; for (int i = 0; i < collection.Count; i++) { foreach (X509Extension extension in collection[i].Extensions) { Console.WriteLine(extension.Oid.FriendlyName + "(" + extension.Oid.Value + ")"); if (extension.Oid.FriendlyName == "Key Usage") { X509KeyUsageExtension ext = (X509KeyUsageExtension)extension; Console.WriteLine(ext.KeyUsages); } if (extension.Oid.FriendlyName == "Basic Constraints") { X509BasicConstraintsExtension ext = (X509BasicConstraintsExtension)extension; Console.WriteLine(ext.CertificateAuthority); Console.WriteLine(ext.HasPathLengthConstraint); Console.WriteLine(ext.PathLengthConstraint); } if (extension.Oid.FriendlyName == "Subject Key Identifier") { X509SubjectKeyIdentifierExtension ext = (X509SubjectKeyIdentifierExtension)extension; Console.WriteLine(ext.SubjectKeyIdentifier); } if (extension.Oid.FriendlyName == "Enhanced Key Usage") { X509EnhancedKeyUsageExtension ext = (X509EnhancedKeyUsageExtension)extension; OidCollection oids = ext.EnhancedKeyUsages; foreach (Oid oid in oids) { Console.WriteLine(oid.FriendlyName + "(" + oid.Value + ")"); } } } } store.Close(); } catch (CryptographicException) { Console.WriteLine("Information could not be written out for this certificate."); } } }
#using <System.dll> #using <system.security.dll> using namespace System; using namespace System::Security::Cryptography; using namespace System::Security::Cryptography::X509Certificates; int main() { try { X509Store^ store = gcnew X509Store( L"MY",StoreLocation::CurrentUser ); store->Open( static_cast<OpenFlags>(OpenFlags::ReadOnly | OpenFlags::OpenExistingOnly) ); X509Certificate2Collection^ collection = dynamic_cast<X509Certificate2Collection^>(store->Certificates); for ( int i = 0; i < collection->Count; i++ ) { System::Collections::IEnumerator^ myEnum = collection[ i ]->Extensions->GetEnumerator(); while ( myEnum->MoveNext() ) { X509Extension^ extension = safe_cast<X509Extension^>(myEnum->Current); Console::WriteLine( L"{0}({1})", extension->Oid->FriendlyName, extension->Oid->Value ); if ( extension->Oid->FriendlyName == L"Key Usage" ) { X509KeyUsageExtension^ ext = dynamic_cast<X509KeyUsageExtension^>(extension); Console::WriteLine( ext->KeyUsages ); } if ( extension->Oid->FriendlyName == L"Basic Constraints" ) { X509BasicConstraintsExtension^ ext = dynamic_cast<X509BasicConstraintsExtension^>(extension); Console::WriteLine( ext->CertificateAuthority ); Console::WriteLine( ext->HasPathLengthConstraint ); Console::WriteLine( ext->PathLengthConstraint ); } if ( extension->Oid->FriendlyName == L"Subject Key Identifier" ) { X509SubjectKeyIdentifierExtension^ ext = dynamic_cast<X509SubjectKeyIdentifierExtension^>(extension); Console::WriteLine( ext->SubjectKeyIdentifier ); } if ( extension->Oid->FriendlyName == L"Enhanced Key Usage" ) { X509EnhancedKeyUsageExtension^ ext = dynamic_cast<X509EnhancedKeyUsageExtension^>(extension); OidCollection^ oids = ext->EnhancedKeyUsages; System::Collections::IEnumerator^ myEnum1 = oids->GetEnumerator(); while ( myEnum1->MoveNext() ) { Oid^ oid = safe_cast<Oid^>(myEnum1->Current); Console::WriteLine( L"{0}({1})", oid->FriendlyName, oid->Value ); } } } } store->Close(); } catch ( CryptographicException^ ) { Console::WriteLine( L"Information could not be written out for this certificate." ); } }

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。


X509Extension コンストラクタ (Oid, Byte[], Boolean)
アセンブリ: System (system.dll 内)

Dim oid As Oid Dim rawData As Byte() Dim critical As Boolean Dim instance As New X509Extension(oid, rawData, critical)


X509Extension クラスを使用するコード例を次に示します。
Imports System Imports System.Security.Cryptography Imports System.Security.Cryptography.X509Certificates Module CertSelect Sub Main() Try Dim store As New X509Store("MY", StoreLocation.CurrentUser) store.Open(OpenFlags.ReadOnly Or OpenFlags.OpenExistingOnly) Dim collection As X509Certificate2Collection = CType(store.Certificates, X509Certificate2Collection) Dim i As Integer For i = 0 To collection.Count Dim extension As X509Extension For Each extension In collection(i).Extensions Console.WriteLine(extension.Oid.FriendlyName + "(" + extension.Oid.Value + ")") If extension.Oid.FriendlyName = "Key Usage" Then Dim ext As X509KeyUsageExtension = CType(extension, X509KeyUsageExtension) Console.WriteLine(ext.KeyUsages) End If If extension.Oid.FriendlyName = "Basic Constraints" Then Dim ext As X509BasicConstraintsExtension = CType(extension, X509BasicConstraintsExtension) Console.WriteLine(ext.CertificateAuthority) Console.WriteLine(ext.HasPathLengthConstraint) Console.WriteLine(ext.PathLengthConstraint) End If If extension.Oid.FriendlyName = "Subject Key Identifier" Then Dim ext As X509SubjectKeyIdentifierExtension = CType(extension, X509SubjectKeyIdentifierExtension) Console.WriteLine(ext.SubjectKeyIdentifier) End If If extension.Oid.FriendlyName = "Enhanced Key Usage" Then Dim ext As X509EnhancedKeyUsageExtension = CType(extension, X509EnhancedKeyUsageExtension) Dim oids As OidCollection = ext.EnhancedKeyUsages Dim oid As Oid For Each oid In oids Console.WriteLine(oid.FriendlyName + "(" + oid.Value + ")") Next oid End If Next extension Next i store.Close() Catch Console.WriteLine("Information could not be written out for this certificate.") End Try End Sub End Module
using System; using System.Security.Cryptography; using System.Security.Cryptography.X509Certificates; public class CertSelect { public static void Main() { try { X509Store store = new X509Store("MY", StoreLocation.CurrentUser); store.Open(OpenFlags.ReadOnly | OpenFlags.OpenExistingOnly); X509Certificate2Collection collection = (X509Certificate2Collection)store.Certificates; for (int i = 0; i < collection.Count; i++) { foreach (X509Extension extension in collection[i].Extensions) { Console.WriteLine(extension.Oid.FriendlyName + "(" + extension.Oid.Value + ")"); if (extension.Oid.FriendlyName == "Key Usage") { X509KeyUsageExtension ext = (X509KeyUsageExtension)extension; Console.WriteLine(ext.KeyUsages); } if (extension.Oid.FriendlyName == "Basic Constraints") { X509BasicConstraintsExtension ext = (X509BasicConstraintsExtension)extension; Console.WriteLine(ext.CertificateAuthority); Console.WriteLine(ext.HasPathLengthConstraint); Console.WriteLine(ext.PathLengthConstraint); } if (extension.Oid.FriendlyName == "Subject Key Identifier") { X509SubjectKeyIdentifierExtension ext = (X509SubjectKeyIdentifierExtension)extension; Console.WriteLine(ext.SubjectKeyIdentifier); } if (extension.Oid.FriendlyName == "Enhanced Key Usage") { X509EnhancedKeyUsageExtension ext = (X509EnhancedKeyUsageExtension)extension; OidCollection oids = ext.EnhancedKeyUsages; foreach (Oid oid in oids) { Console.WriteLine(oid.FriendlyName + "(" + oid.Value + ")"); } } } } store.Close(); } catch (CryptographicException) { Console.WriteLine("Information could not be written out for this certificate."); } } }
#using <System.dll> #using <system.security.dll> using namespace System; using namespace System::Security::Cryptography; using namespace System::Security::Cryptography::X509Certificates; int main() { try { X509Store^ store = gcnew X509Store( L"MY",StoreLocation::CurrentUser ); store->Open( static_cast<OpenFlags>(OpenFlags::ReadOnly | OpenFlags::OpenExistingOnly) ); X509Certificate2Collection^ collection = dynamic_cast<X509Certificate2Collection^>(store->Certificates); for ( int i = 0; i < collection->Count; i++ ) { System::Collections::IEnumerator^ myEnum = collection[ i ]->Extensions->GetEnumerator(); while ( myEnum->MoveNext() ) { X509Extension^ extension = safe_cast<X509Extension^>(myEnum->Current); Console::WriteLine( L"{0}({1})", extension->Oid->FriendlyName, extension->Oid->Value ); if ( extension->Oid->FriendlyName == L"Key Usage" ) { X509KeyUsageExtension^ ext = dynamic_cast<X509KeyUsageExtension^>(extension); Console::WriteLine( ext->KeyUsages ); } if ( extension->Oid->FriendlyName == L"Basic Constraints" ) { X509BasicConstraintsExtension^ ext = dynamic_cast<X509BasicConstraintsExtension^>(extension); Console::WriteLine( ext->CertificateAuthority ); Console::WriteLine( ext->HasPathLengthConstraint ); Console::WriteLine( ext->PathLengthConstraint ); } if ( extension->Oid->FriendlyName == L"Subject Key Identifier" ) { X509SubjectKeyIdentifierExtension^ ext = dynamic_cast<X509SubjectKeyIdentifierExtension^>(extension); Console::WriteLine( ext->SubjectKeyIdentifier ); } if ( extension->Oid->FriendlyName == L"Enhanced Key Usage" ) { X509EnhancedKeyUsageExtension^ ext = dynamic_cast<X509EnhancedKeyUsageExtension^>(extension); OidCollection^ oids = ext->EnhancedKeyUsages; System::Collections::IEnumerator^ myEnum1 = oids->GetEnumerator(); while ( myEnum1->MoveNext() ) { Oid^ oid = safe_cast<Oid^>(myEnum1->Current); Console::WriteLine( L"{0}({1})", oid->FriendlyName, oid->Value ); } } } } store->Close(); } catch ( CryptographicException^ ) { Console::WriteLine( L"Information could not be written out for this certificate." ); } }

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。


X509Extension コンストラクタ

名前 | 説明 |
---|---|
X509Extension () | X509Extension クラスの新しいインスタンスを初期化します。 |
X509Extension (AsnEncodedData, Boolean) | X509Extension クラスの新しいインスタンスを初期化します。 |
X509Extension (Oid, Byte[], Boolean) | X509Extension クラスの新しいインスタンスを初期化します。 |
X509Extension (String, Byte[], Boolean) | X509Extension クラスの新しいインスタンスを初期化します。 |

X509Extension コンストラクタ (AsnEncodedData, Boolean)
アセンブリ: System (system.dll 内)

Dim encodedExtension As AsnEncodedData Dim critical As Boolean Dim instance As New X509Extension(encodedExtension, critical)


X509Extension クラスを使用するコード例を次に示します。
Imports System Imports System.Security.Cryptography Imports System.Security.Cryptography.X509Certificates Module CertSelect Sub Main() Try Dim store As New X509Store("MY", StoreLocation.CurrentUser) store.Open(OpenFlags.ReadOnly Or OpenFlags.OpenExistingOnly) Dim collection As X509Certificate2Collection = CType(store.Certificates, X509Certificate2Collection) Dim i As Integer For i = 0 To collection.Count Dim extension As X509Extension For Each extension In collection(i).Extensions Console.WriteLine(extension.Oid.FriendlyName + "(" + extension.Oid.Value + ")") If extension.Oid.FriendlyName = "Key Usage" Then Dim ext As X509KeyUsageExtension = CType(extension, X509KeyUsageExtension) Console.WriteLine(ext.KeyUsages) End If If extension.Oid.FriendlyName = "Basic Constraints" Then Dim ext As X509BasicConstraintsExtension = CType(extension, X509BasicConstraintsExtension) Console.WriteLine(ext.CertificateAuthority) Console.WriteLine(ext.HasPathLengthConstraint) Console.WriteLine(ext.PathLengthConstraint) End If If extension.Oid.FriendlyName = "Subject Key Identifier" Then Dim ext As X509SubjectKeyIdentifierExtension = CType(extension, X509SubjectKeyIdentifierExtension) Console.WriteLine(ext.SubjectKeyIdentifier) End If If extension.Oid.FriendlyName = "Enhanced Key Usage" Then Dim ext As X509EnhancedKeyUsageExtension = CType(extension, X509EnhancedKeyUsageExtension) Dim oids As OidCollection = ext.EnhancedKeyUsages Dim oid As Oid For Each oid In oids Console.WriteLine(oid.FriendlyName + "(" + oid.Value + ")") Next oid End If Next extension Next i store.Close() Catch Console.WriteLine("Information could not be written out for this certificate.") End Try End Sub End Module
using System; using System.Security.Cryptography; using System.Security.Cryptography.X509Certificates; public class CertSelect { public static void Main() { try { X509Store store = new X509Store("MY", StoreLocation.CurrentUser); store.Open(OpenFlags.ReadOnly | OpenFlags.OpenExistingOnly); X509Certificate2Collection collection = (X509Certificate2Collection)store.Certificates; for (int i = 0; i < collection.Count; i++) { foreach (X509Extension extension in collection[i].Extensions) { Console.WriteLine(extension.Oid.FriendlyName + "(" + extension.Oid.Value + ")"); if (extension.Oid.FriendlyName == "Key Usage") { X509KeyUsageExtension ext = (X509KeyUsageExtension)extension; Console.WriteLine(ext.KeyUsages); } if (extension.Oid.FriendlyName == "Basic Constraints") { X509BasicConstraintsExtension ext = (X509BasicConstraintsExtension)extension; Console.WriteLine(ext.CertificateAuthority); Console.WriteLine(ext.HasPathLengthConstraint); Console.WriteLine(ext.PathLengthConstraint); } if (extension.Oid.FriendlyName == "Subject Key Identifier") { X509SubjectKeyIdentifierExtension ext = (X509SubjectKeyIdentifierExtension)extension; Console.WriteLine(ext.SubjectKeyIdentifier); } if (extension.Oid.FriendlyName == "Enhanced Key Usage") { X509EnhancedKeyUsageExtension ext = (X509EnhancedKeyUsageExtension)extension; OidCollection oids = ext.EnhancedKeyUsages; foreach (Oid oid in oids) { Console.WriteLine(oid.FriendlyName + "(" + oid.Value + ")"); } } } } store.Close(); } catch (CryptographicException) { Console.WriteLine("Information could not be written out for this certificate."); } } }
#using <System.dll> #using <system.security.dll> using namespace System; using namespace System::Security::Cryptography; using namespace System::Security::Cryptography::X509Certificates; int main() { try { X509Store^ store = gcnew X509Store( L"MY",StoreLocation::CurrentUser ); store->Open( static_cast<OpenFlags>(OpenFlags::ReadOnly | OpenFlags::OpenExistingOnly) ); X509Certificate2Collection^ collection = dynamic_cast<X509Certificate2Collection^>(store->Certificates); for ( int i = 0; i < collection->Count; i++ ) { System::Collections::IEnumerator^ myEnum = collection[ i ]->Extensions->GetEnumerator(); while ( myEnum->MoveNext() ) { X509Extension^ extension = safe_cast<X509Extension^>(myEnum->Current); Console::WriteLine( L"{0}({1})", extension->Oid->FriendlyName, extension->Oid->Value ); if ( extension->Oid->FriendlyName == L"Key Usage" ) { X509KeyUsageExtension^ ext = dynamic_cast<X509KeyUsageExtension^>(extension); Console::WriteLine( ext->KeyUsages ); } if ( extension->Oid->FriendlyName == L"Basic Constraints" ) { X509BasicConstraintsExtension^ ext = dynamic_cast<X509BasicConstraintsExtension^>(extension); Console::WriteLine( ext->CertificateAuthority ); Console::WriteLine( ext->HasPathLengthConstraint ); Console::WriteLine( ext->PathLengthConstraint ); } if ( extension->Oid->FriendlyName == L"Subject Key Identifier" ) { X509SubjectKeyIdentifierExtension^ ext = dynamic_cast<X509SubjectKeyIdentifierExtension^>(extension); Console::WriteLine( ext->SubjectKeyIdentifier ); } if ( extension->Oid->FriendlyName == L"Enhanced Key Usage" ) { X509EnhancedKeyUsageExtension^ ext = dynamic_cast<X509EnhancedKeyUsageExtension^>(extension); OidCollection^ oids = ext->EnhancedKeyUsages; System::Collections::IEnumerator^ myEnum1 = oids->GetEnumerator(); while ( myEnum1->MoveNext() ) { Oid^ oid = safe_cast<Oid^>(myEnum1->Current); Console::WriteLine( L"{0}({1})", oid->FriendlyName, oid->Value ); } } } } store->Close(); } catch ( CryptographicException^ ) { Console::WriteLine( L"Information could not be written out for this certificate." ); } }

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
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X509Extension プロパティ

名前 | 説明 | |
---|---|---|
![]() | Critical | 拡張機能がクリティカルであるかどうかを示すブール値を取得します。 |
![]() | Oid | AsnEncodedData オブジェクトの Oid 値を取得または設定します。 ( AsnEncodedData から継承されます。) |
![]() | RawData | ASN.1 (Abstract Syntax Notation One) でエンコードされたデータをバイト配列表現で取得または設定します。 ( AsnEncodedData から継承されます。) |

X509Extension メソッド

名前 | 説明 | |
---|---|---|
![]() | CopyFrom | オーバーライドされます。 指定された AsnEncodedData オブジェクトの拡張機能プロパティをコピーします。 |
![]() | Equals | オーバーロードされます。 2 つの Object インスタンスが等しいかどうかを判断します。 ( Object から継承されます。) |
![]() | Format | ASN.1 (Abstract Syntax Notation One) でエンコードされたデータを、文字列として書式設定して返します。 ( AsnEncodedData から継承されます。) |
![]() | GetHashCode | 特定の型のハッシュ関数として機能します。GetHashCode は、ハッシュ アルゴリズムや、ハッシュ テーブルのようなデータ構造での使用に適しています。 ( Object から継承されます。) |
![]() | GetType | 現在のインスタンスの Type を取得します。 ( Object から継承されます。) |
![]() | ReferenceEquals | 指定した複数の Object インスタンスが同一かどうかを判断します。 ( Object から継承されます。) |
![]() | ToString | 現在の Object を表す String を返します。 ( Object から継承されます。) |

名前 | 説明 | |
---|---|---|
![]() | Finalize | Object がガベージ コレクションにより収集される前に、その Object がリソースを解放し、その他のクリーンアップ操作を実行できるようにします。 ( Object から継承されます。) |
![]() | MemberwiseClone | 現在の Object の簡易コピーを作成します。 ( Object から継承されます。) |

X509Extension メンバ
X509Extension データ型で公開されるメンバを以下の表に示します。



名前 | 説明 | |
---|---|---|
![]() | Critical | 拡張機能がクリティカルであるかどうかを示すブール値を取得します。 |
![]() | Oid | AsnEncodedData オブジェクトの Oid 値を取得または設定します。(AsnEncodedData から継承されます。) |
![]() | RawData | ASN.1 (Abstract Syntax Notation One) でエンコードされたデータをバイト配列表現で取得または設定します。(AsnEncodedData から継承されます。) |

名前 | 説明 | |
---|---|---|
![]() | CopyFrom | オーバーライドされます。 指定された AsnEncodedData オブジェクトの拡張機能プロパティをコピーします。 |
![]() | Equals | オーバーロードされます。 2 つの Object インスタンスが等しいかどうかを判断します。 (Object から継承されます。) |
![]() | Format | ASN.1 (Abstract Syntax Notation One) でエンコードされたデータを、文字列として書式設定して返します。 (AsnEncodedData から継承されます。) |
![]() | GetHashCode | 特定の型のハッシュ関数として機能します。GetHashCode は、ハッシュ アルゴリズムや、ハッシュ テーブルのようなデータ構造での使用に適しています。 (Object から継承されます。) |
![]() | GetType | 現在のインスタンスの Type を取得します。 (Object から継承されます。) |
![]() | ReferenceEquals | 指定した複数の Object インスタンスが同一かどうかを判断します。 (Object から継承されます。) |
![]() | ToString | 現在の Object を表す String を返します。 (Object から継承されます。) |

名前 | 説明 | |
---|---|---|
![]() | Finalize | Object がガベージ コレクションにより収集される前に、その Object がリソースを解放し、その他のクリーンアップ操作を実行できるようにします。 (Object から継承されます。) |
![]() | MemberwiseClone | 現在の Object の簡易コピーを作成します。 (Object から継承されます。) |

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