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

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

BNU_CHUNK_T* cpGFpxSub_GFE(BNU_CHUNK_T* pR, const BNU_CHUNK_T* pA, const BNU_CHUNK_T* pGroundB, gsModEngine* pGFEx)
{
   gsModEngine* pGroundGFE = GFP_PARENT(pGFEx);
   mod_sub subF = MOD_METHOD(pGroundGFE)->sub;

   if(pR != pA) {
      int groundElemLen = GFP_FELEN(pGroundGFE);
      int deg = GFP_EXTDEGREE(pGFEx);
      cpGFpElementCopy(pR+groundElemLen, pA+groundElemLen, groundElemLen*(deg-1));
   }
   return subF(pR, pA, pGroundB, pGroundGFE);
}