DXGKMDT_OPM_REQUESTED_INFORMATION structure (d3dkmdt.h)

The DXGKMDT_OPM_REQUESTED_INFORMATION structure contains information that was requested in a call to the DxgkDdiOPMGetInformation or DxgkDdiOPMGetCOPPCompatibleInformation function.

Syntax

typedef struct _DXGKMDT_OPM_REQUESTED_INFORMATION {
  DXGKMDT_OPM_OMAC omac;
  ULONG            cbRequestedInformationSize;
  BYTE             abRequestedInformation[DXGKMDT_OPM_REQUESTED_INFORMATION_SIZE];
} DXGKMDT_OPM_REQUESTED_INFORMATION, *PDXGKMDT_OPM_REQUESTED_INFORMATION;

Members

omac

A DXGKMDT_OPM_OMAC structure that contains a One-key Cipher Block Chaining (CBC)-mode message authentication code (OMAC) for message authenticity. For more information about OMAC, see the OMAC-1 algorithm. The OMAC-1 parameters that OPM and COPP use are:

E = AES (Advanced Encryption Standard)

t = 128 bits

K = The 128-bit key that the display miniport driver receives when DxgkDdiOPMSetSigningKeyAndSequenceNumbers is called.

n = 128 bits

For information about AES, see the RSA Laboratories website.

cbRequestedInformationSize

The size, in bytes, of the valid data that the abRequestedInformation member points to.

abRequestedInformation[DXGKMDT_OPM_REQUESTED_INFORMATION_SIZE]

A 4076-byte array that specifies the information that is retrieved from a protected output object.

To return the requested information, the display miniport driver should cast abRequestedInformation to one of the following structures, depending on the GUID that was specified in the guidInformation member of the DXGKMDT_OPM_GET_INFO_PARAMETERS or DXGKMDT_OPM_COPP_COMPATIBLE_GET_INFO_PARAMETERS structure that the Parameters parameter of DxgkDdiOPMGetInformation or /dispmprt/nc-dispmprt-dxgkddi_opm_get_copp_compatible_information points to. As an example, the DXGKMDT_OPM_GET_CONNECTED_HDCP_DEVICE_INFORMATION GUID indicates the DXGKMDT_OPM_CONNECTED_HDCP_DEVICE_INFORMATION structure.

Requirements

See also

DXGKMDT_OPM_ACP_AND_CGMSA_SIGNALING

DXGKMDT_OPM_ACTUAL_OUTPUT_FORMAT

DXGKMDT_OPM_CONNECTED_HDCP_DEVICE_INFORMATION

DXGKMDT_OPM_COPP_COMPATIBLE_GET_INFO_PARAMETERS

DXGKMDT_OPM_GET_INFO_PARAMETERS

DXGKMDT_OPM_OMAC

DXGKMDT_OPM_OUTPUT_ID

DXGKMDT_OPM_STANDARD_INFORMATION

DxgkDdiOPMGetCOPPCompatibleInformation

DxgkDdiOPMGetInformation