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X509Extension Constructor ()
.NET Framework (current version)
Initializes a new instance of the X509Extension class.
Assembly: System (in System.dll)
This constructor creates an empty X509Extension object, unlike the other constructors for this class that use certificate information from either a byte array, a pointer or a certificate file to create the object.
The following code example demonstrates using the X509Extension class.
#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." ); } }
.NET Framework
Available since 2.0
Available since 2.0
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