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diff --git a/ext/ipp/sources/ippcp/gsmod_inv.c b/ext/ipp/sources/ippcp/gsmod_inv.c
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+/*******************************************************************************
+* Copyright 2017-2018 Intel Corporation
+* All Rights Reserved.
+*
+* If this  software was obtained  under the  Intel Simplified  Software License,
+* the following terms apply:
+*
+* The source code,  information  and material  ("Material") contained  herein is
+* owned by Intel Corporation or its  suppliers or licensors,  and  title to such
+* Material remains with Intel  Corporation or its  suppliers or  licensors.  The
+* Material  contains  proprietary  information  of  Intel or  its suppliers  and
+* licensors.  The Material is protected by  worldwide copyright  laws and treaty
+* provisions.  No part  of  the  Material   may  be  used,  copied,  reproduced,
+* modified, published,  uploaded, posted, transmitted,  distributed or disclosed
+* in any way without Intel's prior express written permission.  No license under
+* any patent,  copyright or other  intellectual property rights  in the Material
+* is granted to  or  conferred  upon  you,  either   expressly,  by implication,
+* inducement,  estoppel  or  otherwise.  Any  license   under such  intellectual
+* property rights must be express and approved by Intel in writing.
+*
+* Unless otherwise agreed by Intel in writing,  you may not remove or alter this
+* notice or  any  other  notice   embedded  in  Materials  by  Intel  or Intel's
+* suppliers or licensors in any way.
+*
+*
+* If this  software  was obtained  under the  Apache License,  Version  2.0 (the
+* "License"), the following terms apply:
+*
+* You may  not use this  file except  in compliance  with  the License.  You may
+* obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+*
+*
+* Unless  required  by   applicable  law  or  agreed  to  in  writing,  software
+* distributed under the License  is distributed  on an  "AS IS"  BASIS,  WITHOUT
+* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+*
+* See the   License  for the   specific  language   governing   permissions  and
+* limitations under the License.
+*******************************************************************************/
+
+/* 
+// 
+//  Purpose:
+//     Cryptography Primitive. Modular Arithmetic Engine. General Functionality
+// 
+//  Contents:
+//        gs_inv()
+//
+*/
+
+#include "owndefs.h"
+#include "owncp.h"
+#include "pcpbnumisc.h"
+#include "pcpbnuarith.h"
+#include "gsmodstuff.h"
+
+//tbcd: temporary excluded: #include <assert.h>
+
+/*
+// returns r =1/a
+//    a in desidue domain
+//    r in desidue domain
+*/
+BNU_CHUNK_T* gs_inv(BNU_CHUNK_T* pr, const BNU_CHUNK_T* pa, gsModEngine* pME, alm_inv alm_inversion)
+{
+   int k = alm_inversion(pr, pa, pME);
+
+   if(0==k)
+      return NULL;
+
+   {
+      int mLen = MOD_LEN(pME);
+      int m = mLen*BNU_CHUNK_BITS;
+      mod_mul mon_mul = MOD_METHOD(pME)->mul;
+
+      BNU_CHUNK_T* t = gsModPoolAlloc(pME, 1);
+      //tbcd: temporary excluded: assert(NULL!=t);
+
+      if(k>m) {
+         ZEXPAND_BNU(t, 0, mLen);
+         t[0] = 1;
+         mon_mul(pr, pr, t, pME);
+         k -= m;
+      }
+      ZEXPAND_BNU(t, 0, mLen);
+      SET_BIT(t, m-k); /* t = 2^(m-k) */
+      mon_mul(pr, pr, t, pME);
+
+      gsModPoolFree(pME, 1);
+
+      return pr;
+   }
+}