SamRidToSid - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers
#ifndef _NTSAM_H

/**
 * The SamRidToSid method obtains the SID of an account, given a RID.
 *
 * \param ObjectHandle The "Domain", "User", "Group", or "Alias" object handle.
 * \param Rid The RID of the object.
 * \param Sid The SID of the object referenced by Rid.
 * \return NTSTATUS Successful or errant status.
 * \sa https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-samr/00ff8192-a4f6-45ba-9f65-917e46b6a693
 */
NTSYSAPI
NTSTATUS
NTAPI
SamRidToSid(
    _In_ SAM_HANDLE ObjectHandle,
    _In_ ULONG Rid,
    _Outptr_ PSID *Sid
    );

#endif

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NtDoc

This function is a wrapper over an RPC method documented in the [MS-SAMR] specification.