Recolher sumário
Expandir sumário
Expandir Minimizar

CreateCryptoSession function

Creates a cryptographic session to encrypt video content that is sent to the display miniport driver.


HRESULT APIENTRY* CreateCryptoSession(
  _In_       D3D10DDI_HDEVICE                  hDevice,
  _In_ const D3D11_1DDIARG_CREATECRYPTOSESSION *pCreateData,
  _In_       D3D11_1DDI_HCRYPTOSESSION         hCryptoSession,
  _In_       D3D11_1DDI_HRTCRYPTOSESSION       hRTCryptoSession


hDevice [in]

A handle to the display device (graphics context).

pCreateData [in]

A pointer to a D3D11_1DDIARG_CREATECRYPTOSESSION structure. This structure specifies the attributes of the cryptographic session to be created.

hCryptoSession [in]

A handle to the driver's private data for the cryptographic session. For more information, see the Remarks section.

hRTCryptoSession [in]

A handle to the cryptographic session that the driver should use when it calls back into the Direct3D runtime.

Return value

Returns one of the following values:

Return codeDescription

The authenticated channel was created successfully.


The graphics adapter was removed.


A cryptographic type was specified that is not supported by the decode profile.


Memory was not available to complete the operation.



The Direct3D runtime calls CreateCryptoSession to create a cryptographic session that the runtime uses to manage a session key and to perform cryptographic operations for video content that is stored in protected memory.

The runtime calls CreateCryptoSession after it has called the driver's CalcPrivateCryptoSessionSize to determine the size in bytes for the private data that the driver requires for the cryptographic session. The runtime allocates the memory for this private data for the driver. The driver uses this memory to store private data that is related to the cryptographic session.

When the runtime calls CreateCryptoSession, it passes the handle to the private data memory in the hCryptoSession parameter. This handle is actually a pointer to the memory.

The driver must keep track of the handle to the display device that was used to create the cryptographic session. The driver should fail all subsequent calls that use this created cryptographic session, such as NegotiateCryptoSessionKeyExchange, if the display device that is specified in those calls is different from the display device that was used to create the cryptographic session.

If the DecodeProfile member of the D3D11_1DDIARG_CREATECRYPTOSESSION structure is set to NULL_GUID, the cryptographic session will not be used for DirectX Video Acceleration (DXVA) decoding. If DecodeProfile is not set to NULL_GUID, the driver should fail the call with D3DDDIERR_UNSUPPORTEDCRYPTO if the CryptoType member is set to a cryptographic type that is not supported by the decode profile.


Minimum supported client

Windows 8

Minimum supported server

Windows Server 2012

Target platform



D3d10umddi.h (include D3d10umddi.h)

See also




Send comments about this topic to Microsoft

© 2015 Microsoft