code: func AcquireServerCredentials(principalName string) (*sspi.Credentials, error) {
  	return acquireCredentials(principalName, sspi.SECPKG_CRED_INBOUND, nil)
  }
docs: // AcquireServerCredentials acquires server credentials that will
  // be used to authenticate clients.
  // The principalName parameter is passed to the underlying call to
  // the winapi AcquireCredentialsHandle function (and specifies the
  // name of the principal whose credentials the underlying handle
  // will reference).
  // As a special case, using an empty string for the principal name
  // will require the credential of the user under whose security context
  // the current process is running.