RtlLengthRequiredSid function (ntifs.h)

Article
02/22/2024

The RtlLengthRequiredSid routine returns the length, in bytes, of the buffer required to store a security identifier (SID) with a specified number of subauthorities.

Syntax

NTSYSAPI ULONG RtlLengthRequiredSid(
  [in] ULONG SubAuthorityCount
);

Parameters

[in] SubAuthorityCount

The number of subauthorities to be stored in the SID.

Return value

RtlLengthRequiredSid returns the length, in bytes, of the buffer required to store the SID structure.

Remarks

For more information about security and access control, see Windows security model for driver developers and the documentation on these topics in the Windows SDK.

Requirements

Requirement	Value
Target Platform	Universal
Header	ntifs.h (include Ntifs.h)
Library	NtosKrnl.lib
DLL	NtosKrnl.exe (kernel mode); Ntdll.dll (user mode)
IRQL	<= APC_LEVEL