The AllocateAndInitializeSid function allocates and initializes a security identifier (SID) with up to eight subauthorities.

AllocateAndInitializeSid.cpp

// AllocateAndInitializeSid function is part of the Windows API, specifically the Security Support Provider Interface (SSPI), and it is used for managing security identifiers (SIDs). SIDs are unique identifiers assigned to each security principal, such as a user or a group, in Windows.

#include <iostream>
#include <windows.h>
using namespace std;
int main()
  {
  PSID psid = NULL;
  SID_IDENTIFIER_AUTHORITY sidAuth = SECURITY_NT_AUTHORITY;

  if(AllocateAndInitializeSid(&sidAuth,2,SECURITY_BUILTIN_DOMAIN_RID,DOMAIN_ALIAS_RID_ADMINS,0,0,0,0,0,0,&psid))
    {
      LPWSTR sidString;
      if(ConvertSidToStringSidW(psid,&sidString))
        {
        wcout<<"SID "<<sidString<<endl;
        LocalFree(sidString);
        }
      else
        {
          cerr<<"Error converting Sid to string "<<endl;
        }

      FreeSid(psid);
    }
  else
    {
      cerr<<"Error Allocating and initailizing sid"<<endl;
    }

    system("PAUSE");
    return 0;
  }