## X509KeyUsageExtension class


Extension object to keep extra information about the usage of a key. Objects of this class should only be allocated using [System::MakeObject()](../../system/makeobject/) function. Never create instance of this type on stack or using operator new, as it will result in runtime errors and/or assertion faults. Always wrap this class into [System::SmartPtr](../../system/smartptr/) pointer and use this pointer to pass it to functions as argument.

```cpp
class X509KeyUsageExtension : public System::Security::Cryptography::X509Certificates::X509Extension
```

## Methods

| Method | Description |
| --- | --- |
| [CopyFrom](./copyfrom/)(const SharedPtr\<AsnEncodedData\>\&) override | Copies extension data from other object. |
| [get_KeyUsages](./get_keyusages/)() | Gets key usages. |
| [X509KeyUsageExtension](./x509keyusageextension/)() | RTTI information. |
| [X509KeyUsageExtension](./x509keyusageextension/)(const SharedPtr\<AsnEncodedData\>\&, bool) | Constructor. |
| [X509KeyUsageExtension](./x509keyusageextension/)(X509KeyUsageFlags, bool) | Constructor. |
## See Also

* Class [X509Extension](../x509extension/)
* Namespace [System::Security::Cryptography::X509Certificates](../)
* Library [Aspose.Font for C++](../../)