ext/ipp/sources/ippcp/pcpgfpec_selectp192r1w7.c

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/* 
// 
//  Purpose:
//     Intel(R) Integrated Performance Primitives. Cryptography Primitives.
//     Internal EC over GF(p^m) basic Definitions & Function Prototypes
// 
//     Context:
//        p192r1_select_ap_w7()
//
*/

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

/*
// select affine point
*/
#if (_IPP32E < _IPP32E_M7)
void p192r1_select_ap_w7(BNU_CHUNK_T* pVal, const BNU_CHUNK_T* pTbl, int idx)
{
   #define OPERAND_BITSIZE (192)
   #define LEN_P192        (BITS_BNU_CHUNK(OPERAND_BITSIZE))
   #define LEN_P192_APOINT (2*LEN_P192)

   const int tblLen = 64;
   int i;
   unsigned int n;

   /* clear output affine point */
   for(n=0; n<LEN_P192_APOINT; n++)
      pVal[n] = 0;

   /* select poiint */
   for(i=1; i<=tblLen; i++) {
      BNU_CHUNK_T mask = cpIsEqu_ct(i, idx);
      for(n=0; n<LEN_P192_APOINT; n++)
         pVal[n] |= (pTbl[n] & mask);
      pTbl += LEN_P192_APOINT;
   }

   #undef OPERAND_BITSIZE
   #undef LEN_P192
   #undef LEN_P192_APOINT
}
#endif