SID structure (winnt.h)

The security identifier (SID) structure is a variable-length structure used to uniquely identify users or groups.

Applications should not modify a SID directly. To create and manipulate a security identifier, use the functions listed in the See Also section.

Syntax

typedef struct _SID {
  BYTE                     Revision;
  BYTE                     SubAuthorityCount;
  SID_IDENTIFIER_AUTHORITY IdentifierAuthority;
#if ...
  DWORD                    *SubAuthority[];
#else
  DWORD                    SubAuthority[ANYSIZE_ARRAY];
#endif
} SID, *PISID;

Members

Revision

SubAuthorityCount

IdentifierAuthority

SubAuthority[*]

SubAuthority[ANYSIZE_ARRAY]

Requirements

Requirement	Value
Minimum supported client	Windows XP [desktop apps only]
Minimum supported server	Windows Server 2003 [desktop apps only]
Header	winnt.h (include Windows.h)

See also

AllocateAndInitializeSid

ConvertSidToStringSid

ConvertStringSidToSid

CopySid

EqualSid

FreeSid

GetLengthSid

GetSidIdentifierAuthority

GetSidLengthRequired

GetSidSubAuthority

GetSidSubAuthorityCount

InitializeSid

IsValidSid

LookupAccountName

LookupAccountSid

SID Components