ext/ipp/sources/ippcp/pcpgfpx_set.c

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

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

BNU_CHUNK_T* cpGFpxSet(BNU_CHUNK_T* pE, const BNU_CHUNK_T* pDataA, int nsA, gsModEngine* pGFEx)
{
   if( GFP_IS_BASIC(pGFEx) )
      return cpGFpSet(pE, pDataA, nsA, pGFEx);

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

      BNU_CHUNK_T* pTmpE = pE;
      int basicDeg = cpGFpBasicDegreeExtension(pGFEx);

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

         error = NULL == cpGFpSet(pTmpE, pDataA, pieceA, pBasicGFE);
         pTmpE   += basicElemLen;
         pDataA += pieceA;
         nsA -= pieceA;
      }

      return (deg<basicDeg)? NULL : pE;
   }
}