What security package is implemented with the following code?

What security package is implemented with the following code?
dwStatus = DsMakSpn
(
“ldap”,
“MyServer.Mydomain.com”,
NULL,
0,
NULL,
&pcSpnLength,
pszSpn
);
rpcStatus = RpcServerRegisterAuthInfo
(
psz
RPC_C_AUTHN_GSS_NEGOTIATE,
NULL,
NULL
);

A.
Diffie-Hellman encryption

B.
Repurposing