public unsafe static int AcquireCredentialsHandle( SecurDll dll,
                                                    string package,
                                                    CredentialUse intent,
                                                    ref SecureCredential authdata,
                                                    out SafeFreeCredentials outCredential
                                                    )
        {

            GlobalLog.Print("SafeFreeCredentials::AcquireCredentialsHandle#2("
                            + dll + ","
                            + package + ", "
                            + intent + ", "
                            + authdata + ")"
                            );

            int errorCode = -1;
            long timeStamp;


            // If there is a certificate, wrap it into an array.
            // Not threadsafe.
            IntPtr copiedPtr = authdata.certContextArray;
            try
            {
                IntPtr certArrayPtr = new IntPtr(&copiedPtr);
                if (copiedPtr != IntPtr.Zero) {
                    authdata.certContextArray = certArrayPtr;
                }

                switch (dll) {
                case SecurDll.SECURITY:
                            outCredential = new SafeFreeCredential_SECURITY();

                            RuntimeHelpers.PrepareConstrainedRegions();
                            try {} finally {

                                errorCode = UnsafeNclNativeMethods.SafeNetHandles_SECURITY.AcquireCredentialsHandleW(
                                                                   null,
                                                                   package,
                                                                   (int)intent,
                                                                   null,
                                                                   ref authdata,
                                                                   null,
                                                                   null,
                                                                   ref outCredential._handle,
                                                                   out timeStamp
                                                                   );
                            }
                            break;

                default:  throw new ArgumentException(SR.GetString(SR.net_invalid_enum, "SecurDll"), "Dll");
                }
            }
            finally
            {
                authdata.certContextArray = copiedPtr;
            }

#if TRAVE
            GlobalLog.Print("Unmanaged::AcquireCredentialsHandle() returns 0x"
                            + errorCode.ToString("x")
                            + ", handle = " + outCredential.ToString()
                            );
#endif

            if (errorCode != 0) {
                outCredential.SetHandleAsInvalid();
            }
            return errorCode;

        }
        public unsafe static int AcquireDefaultCredential( SecurDll dll,
                                                    string package,
                                                    CredentialUse intent,
                                                    out SafeFreeCredentials outCredential
                                                    )
        {

            GlobalLog.Print("SafeFreeCredentials::AcquireDefaultCredential("
                            + dll + ","
                            + package + ", "
                            + intent + ")"
                            );

            int errorCode = -1;
            long timeStamp;

            switch (dll) {
            case SecurDll.SECURITY:
                        outCredential = new SafeFreeCredential_SECURITY();

                        RuntimeHelpers.PrepareConstrainedRegions();
                        try {} finally {

                            errorCode = UnsafeNclNativeMethods.SafeNetHandles_SECURITY.AcquireCredentialsHandleW(
                                                               null,
                                                               package,
                                                               (int)intent,
                                                               null,
                                                               IntPtr.Zero,
                                                               null,
                                                               null,
                                                               ref outCredential._handle,
                                                               out timeStamp
                                                               );
                        }
                        break;

            default:  throw new ArgumentException(SR.GetString(SR.net_invalid_enum, "SecurDll"), "Dll");
            }

#if TRAVE
            GlobalLog.Print("Unmanaged::AcquireCredentialsHandle() returns 0x"
                            + errorCode.ToString("x")
                            + ", handle = " + outCredential.ToString()
                            );
#endif

            if (errorCode != 0) {
                outCredential.SetHandleAsInvalid();
            }
            return errorCode;

        }