System.Net.SSPIWrapper.AcquireDefaultCredential C# (CSharp) Method

        public static SafeFreeCredentials AcquireDefaultCredential(SSPIInterface secModule, string package, Interop.SspiCli.CredentialUse intent)
        {
            if (NetEventSource.IsEnabled)
            {
                NetEventSource.Enter(null, package);
                NetEventSource.Log.AcquireDefaultCredential(package, intent);
            }

            SafeFreeCredentials outCredential = null;
            int errorCode = secModule.AcquireDefaultCredential(package, intent, out outCredential);

            if (errorCode != 0)
            {
                if (NetEventSource.IsEnabled) NetEventSource.Error(null, SR.Format(SR.net_log_operation_failed_with_error, nameof(AcquireDefaultCredential), $"0x{errorCode:X}"));
                throw new Win32Exception(errorCode);
            }
            return outCredential;
        }

 private void Initialize(bool isServer, string package, NetworkCredential credential, string spn, ContextFlags requestedContextFlags, System.Security.Authentication.ExtendedProtection.ChannelBinding channelBinding)
 {
     this.m_TokenSize             = SSPIWrapper.GetVerifyPackageInfo(GlobalSSPI.SSPIAuth, package, true).MaxToken;
     this.m_IsServer              = isServer;
     this.m_Spn                   = spn;
     this.m_SecurityContext       = null;
     this.m_RequestedContextFlags = requestedContextFlags;
     this.m_Package               = package;
     this.m_ChannelBinding        = channelBinding;
     if (credential is SystemNetworkCredential)
     {
         this.m_CredentialsHandle = SSPIWrapper.AcquireDefaultCredential(GlobalSSPI.SSPIAuth, package, this.m_IsServer ? CredentialUse.Inbound : CredentialUse.Outbound);
         this.m_UniqueUserId      = "/S";
     }
     else
     {
         string       userName = credential.InternalGetUserName();
         string       domain   = credential.InternalGetDomain();
         AuthIdentity authdata = new AuthIdentity(userName, credential.InternalGetPassword(), ((package == "WDigest") && ((domain == null) || (domain.Length == 0))) ? null : domain);
         this.m_UniqueUserId      = domain + "/" + userName + "/U";
         this.m_CredentialsHandle = SSPIWrapper.AcquireCredentialsHandle(GlobalSSPI.SSPIAuth, package, this.m_IsServer ? CredentialUse.Inbound : CredentialUse.Outbound, ref authdata);
     }
 }