PFND3D11_1DDI_QUERYAUTHENTICATEDCHANNEL callback function

Description

Queries an authenticated channel for capability and state information. Implemented by a Windows Display Driver Model (WDDM) 1.2 or later user-mode display driver.

Parameters

hDevice

A handle to the display device (graphics context).

hCAuthChannel

A handle to an authenticated channel object that was created through a call to the CreateAuthenticatedChannel(D3D11_1) function.

InputDataSize

The size, in bytes, of the data in the pInputData array.

pInputData

A pointer to a buffer that describes the information to query. The data in this buffer is formatted as a D3D11_1DDI_AUTHENTICATED_QUERY_INPUT structure.

OutputDataSize

The size, in bytes, of the data in the pOutputData array.

pOutputData

A pointer to a buffer that contains the queried information. For more information, see the Remarks section.

Return value

Returns one of the following values:

Remarks

The pInputData parameter references a buffer that contains a D3D11_1DDI_AUTHENTICATED_QUERY_INPUT structure. This structure contains the driver's handle to the authenticated channel, a sequence number, and a GUID that indicates the type of query to perform. The driver must return E_INVALIDARG if the sequence number was not previously initialized by using the ConfigureAuthenticatedChannel(D3D11_1) function. The driver must also return E_INVALIDARG if the sequence number is not greater than the sequence number of the previous query call.

The byte array that is referenced by the pOutputData parameter is in a format that is specified by the QueryType member of the D3D11_1DDI_AUTHENTICATED_QUERY_INPUT structure. The following list describes the format of this data based on the QueryType member.

The driver prepares the output buffer that is referenced by the pOutputData parameter by following these steps:

1. Each structure that is returned based on the QueryType member starts with a D3D11_1DDI_AUTHENTICATED_QUERY_OUTPUT structure. The driver must copy the members of the D3D11_1DDI_AUTHENTICATED_QUERY_INPUT to the D3D11_1DDI_AUTHENTICATED_QUERY_OUTPUT structure.
2. The driver must set the ReturnCode member to the same return code that it will return for the QueryAuthenticatedChannel(D3D11_1) call. This provides the application with a secure mechanism of accessing the return code.
3. Based on the value of the QueryType member, the driver must initialize the corresponding structure that follows the D3D11_1DDI_AUTHENTICATED_QUERY_OUTPUT structure in the pOutputData buffer.

4. The driver must sign the pOutputData buffer in a way that is identical to the way it handles Output Protection Manager (OPM) queries.

   The D3D11_1DDI_AUTHENTICATED_QUERY_OUTPUT structure contains an AES-based one-key CBC message authentication code (OMAC) of the data. The display miniport driver must calculate an OMAC over the data in the output buffer to authenticate the data. The driver does this by first setting the omac member to zero and then calculating an OMAC for the data in the buffer. The driver then sets the omac member to the OMAC that it calculated.

The display miniport driver must return E_INVALIDARG for the QueryAuthenticatedChannel(D3D11_1) call under the following conditions:

• The sequence number is not greater than a sequence number that was specified in a previous configuration call.
• The sequence number has not yet been initialized by a call to the ConfigureAuthenticatedChannel(D3D11_1) function.
• The OutputDataSize parameter is less than size of the structure specified by the D3D11_1DDI_AUTHENTICATED_CONFIGURE_INPUT.QueryType member.

See also

ConfigureAuthenticatedChannel(D3D11_1)

CreateAuthenticatedChannel(D3D11_1)

D3D11_1DDI_AUTHENTICATED_QUERY_INPUT

D3D11_1DDI_AUTHENTICATED_QUERY_OUTPUT