ext/ipp/sources/ippcp/pcpgfpx_get.c

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/*
//     Intel(R) Integrated Performance Primitives. Cryptography Primitives.
//     Internal operations over GF(p) extension.
// 
//     Context:
//        cpGFpxGet()
//
*/

#include "owncp.h"
#include "pcpbnumisc.h"
#include "pcpgfpxstuff.h"
#include "gsscramble.h"

BNU_CHUNK_T* cpGFpxGet(BNU_CHUNK_T* pDataA, int nsA, const BNU_CHUNK_T* pE, gsModEngine* pGFEx)
{
   cpGFpElementPadd(pDataA, nsA, 0);

   if( GFP_IS_BASIC(pGFEx) )
      return cpGFpGet(pDataA, nsA, pE, pGFEx);

   else {
      gsModEngine* pBasicGFE = cpGFpBasic(pGFEx);
      int basicElemLen = GFP_FELEN(pBasicGFE);

      BNU_CHUNK_T* pTmp = pDataA;
      int basicDeg = cpGFpBasicDegreeExtension(pGFEx);

      int deg;
      for(deg=0; deg<basicDeg && nsA>0; deg++) {
         int pieceA = IPP_MIN(nsA, basicElemLen);

         cpGFpGet(pTmp, pieceA, pE, pBasicGFE);
         pE   += basicElemLen;
         pTmp += pieceA;
         nsA -= pieceA;
      }

      return pDataA;
   }
}