The EFS_RPC_BLOB type is used to represent a generic binary large object (BLOB) (that is, an opaque data type).

 typedef struct _EFS_RPC_BLOB {
   [range(0,266240)] DWORD cbData;
   [size_is(cbData)] unsigned char* bData;
 } EFS_RPC_BLOB,
  *PEFS_RPC_BLOB;

cbData: The length, in bytes, of the data object in the bData field.

bData: The contents of the data object.<25>