// ntifs.h

typedef union _SE_SID {
  SID   Sid;
  UCHAR Buffer[SECURITY_MAX_SID_SIZE];
} SE_SID, *PSE_SID;
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Windows Driver Kit DDI reference (ns-ntifs-_se_sid)

_SE_SID structure

Description

The SE_SID union holds the maximum-sized valid Security Identifier (SID). The structure occupies 68-bytes and is suitable for stack allocation.

Members

`Sid`

A security identifier structure used to uniquely identify users or groups.

`Buffer`

Specifies an array of SECURITY_MAX_SID_SIZE for allocating enough memory for the largest possible SID size.

SE_SID - NtDoc