ext/ipp/sources/ippcp/pcpgfpec_baseprod.c

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/*
//
//  Purpose:
//     Intel(R) Integrated Performance Primitives. Cryptography Primitives.
//     Internal EC over GF(p^m) basic Definitions & Function Prototypes
//
//     Context:
//        gfec_BasePointProduct()
//
*/

#include "owndefs.h"
#include "owncp.h"
#include "pcpgfpecstuff.h"
#include "gsscramble.h"


IppsGFpECPoint* gfec_BasePointProduct(IppsGFpECPoint* pR,
                        const BNU_CHUNK_T* pScalarG, int scalarGlen,
                        const IppsGFpECPoint* pP, const BNU_CHUNK_T* pScalarP, int scalarPlen,
                        IppsGFpECState* pEC, Ipp8u* pScratchBuffer)
{
   FIX_BNU(pScalarG, scalarGlen);
   FIX_BNU(pScalarP, scalarPlen);

   {
      gsModEngine* pGForder = ECP_MONT_R(pEC);
      int orderBits = MOD_BITSIZE(pGForder);
      int orderLen  = MOD_LEN(pGForder);
      BNU_CHUNK_T* tmpScalarG = cpGFpGetPool(2, pGForder);
      BNU_CHUNK_T* tmpScalarP = tmpScalarG+orderLen+1;

      cpGFpElementCopyPadd(tmpScalarG, orderLen+1, pScalarG,scalarGlen);
      cpGFpElementCopyPadd(tmpScalarP, orderLen+1, pScalarP,scalarPlen);

      if(ECP_PREMULBP(pEC)) {
         BNU_CHUNK_T* productG = cpEcGFpGetPool(2, pEC);
         BNU_CHUNK_T* productP = productG+ECP_POINTLEN(pEC);

         gfec_base_point_mul(productG, (Ipp8u*)tmpScalarG, orderBits, pEC);
         gfec_point_mul(productP, ECP_POINT_X(pP), (Ipp8u*)tmpScalarP, orderBits, pEC, pScratchBuffer);
         gfec_point_add(ECP_POINT_X(pR), productG, productP, pEC);

         cpEcGFpReleasePool(2, pEC);
      }

      else {
         gfec_point_prod(ECP_POINT_X(pR),
                         ECP_G(pEC), (Ipp8u*)tmpScalarG,
                         ECP_POINT_X(pP), (Ipp8u*)tmpScalarP,
                         orderBits,
                         pEC, pScratchBuffer);
      }

      cpGFpReleasePool(2, pGForder);
   }

   ECP_POINT_FLAGS(pR) = gfec_IsPointAtInfinity(pR)? 0 : ECP_FINITE_POINT;
   return pR;
}