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

        internal static SecurityPackageInfoClass GetVerifyPackageInfo(SSPIInterface secModule, string packageName, bool throwIfMissing)
        {
            SecurityPackageInfoClass[] supportedSecurityPackages = EnumerateSecurityPackages(secModule);
            if (supportedSecurityPackages != null)
            {
                for (int i = 0; i < supportedSecurityPackages.Length; i++)
                {
                    if (string.Compare(supportedSecurityPackages[i].Name, packageName, StringComparison.OrdinalIgnoreCase) == 0)
                    {
                        return supportedSecurityPackages[i];
                    }
                }
            }

            if (NetEventSource.IsEnabled) NetEventSource.Log.SspiPackageNotFound(packageName);

            if (throwIfMissing)
            {
                throw new NotSupportedException(SR.net_securitypackagesupport);
            }

            return null;
        }

 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);
     }
 }