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STORAGE_RPMB_DESCRIPTOR structure (winioctl.h)

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To interface with the Replay Protected Memory Block (RPMB), applications first need to query whether the device contains an RPMB and the max payload size the RPMB supports. To do this, the application sends IOCTL_STORAGE_QUERY_PROPERTY IOCTL with STORAGE_PROPERTY_ID enumeration set to StorageAdapterRpmbProperty (defined in STORAGE_PROPERTY_QUERY in ntddstor.h). Storport then responds with the following payload (defined in ntddstor.h) when STORAGE_QUERY_TYPE enumeration is set to PropertyStandardQuery.

Syntax

typedef struct _STORAGE_RPMB_DESCRIPTOR {
  DWORD                   Version;
  DWORD                   Size;
  DWORD                   SizeInBytes;
  DWORD                   MaxReliableWriteSizeInBytes;
  STORAGE_RPMB_FRAME_TYPE FrameFormat;
} STORAGE_RPMB_DESCRIPTOR, *PSTORAGE_RPMB_DESCRIPTOR;

Members

Version

Shall be set to STORAGE_RPMB_DESCRIPTOR_VERSION_1

Size

Shall be set to sizeof(STORAGE_RPMB_DESCRIPTOR)

SizeInBytes

The size of the RPMB, in bytes. 0 if not supported, RPMB size in bytes otherwise.

MaxReliableWriteSizeInBytes

The maximum amount of data supported in one transaction in bytes. 0 if not supported, minimum 512 bytes.

FrameFormat

To support different RPMB frame formats, specifies which frame format the payload will be in so the port driver can take the appropriate action.

Requirements

Requirement Value
Minimum supported client Windows 10 Build 20348
Minimum supported server Windows 10 Build 20348
Header winioctl.h