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/* 
//     Intel(R) Integrated Performance Primitives. Cryptography Primitives.
//     Operations over GF(p).
// 
//     Context:
//        ippsGFpSetElementOctString()
// 
*/
#include "owndefs.h"
#include "owncp.h"

#include "pcpgfpstuff.h"
#include "pcpgfpxstuff.h"
#include "pcptool.h"


/*F*
// Name: ippsGFpSetElementOctString
//
// Purpose: Set GF Element from the input octet string
//
// Returns:                   Reason:
//    ippStsNullPtrErr           NULL == pGFp
//                               NULL == pR
//                               NULL == pStr && strSize>0
//
//    ippStsContextMatchErr      invalid pGFp->idCtx
//                               invalid pR->idCtx
//
//    ippStsSizeErr              !(0<strSize && strSize<=(int)(GFP_FELEN32()*sizeof(Ipp32u)))
//
//    ippStsOutOfRangeErr        GFPE_ROOM() != GFP_FELEN()
//                               BNU representation of pStr[] >= modulus
//
//    ippStsNoErr                no error
//
// Parameters:
//    pStr        Pointer to the octet string
//    strSize     Size of the octet string buffer in bytes.
//    pR          pointer to Finite Field Element context
//    pGFp         pointer to Finite Field context
*F*/
IPPFUN(IppStatus, ippsGFpSetElementOctString,(const Ipp8u* pStr, int strSize, IppsGFpElement* pR, IppsGFpState* pGFp))
{
   IPP_BAD_PTR2_RET(pR, pGFp);
   pGFp = (IppsGFpState*)( IPP_ALIGNED_PTR(pGFp, GFP_ALIGNMENT) );
   IPP_BADARG_RET( !GFP_TEST_ID(pGFp), ippStsContextMatchErr );
   IPP_BADARG_RET( !GFPE_TEST_ID(pR), ippStsContextMatchErr );

   IPP_BADARG_RET( (!pStr && 0<strSize), ippStsNullPtrErr);
   IPP_BADARG_RET(!(0<strSize && strSize<=(int)(GFP_FELEN32(GFP_PMA(pGFp))*sizeof(Ipp32u))), ippStsSizeErr );

   IPP_BADARG_RET( GFPE_ROOM(pR)!=GFP_FELEN(GFP_PMA(pGFp)), ippStsOutOfRangeErr);

   {
      gsModEngine* pGFE = GFP_PMA(pGFp);
      gsModEngine* pBasicGFE = cpGFpBasic(pGFE);
      int basicDeg = cpGFpBasicDegreeExtension(pGFE);
      int basicElemLen = GFP_FELEN(pBasicGFE);
      int basicSize = BITS2WORD8_SIZE(BITSIZE_BNU(GFP_MODULUS(pBasicGFE),GFP_FELEN(pBasicGFE)));

      BNU_CHUNK_T* pDataElm = GFPE_DATA(pR);

      int deg, error;
      /* set element to zero */
      cpGFpElementPadd(pDataElm, GFP_FELEN(pGFE), 0);

      /* convert oct string to element (from low to high) */
      for(deg=0, error=0; deg<basicDeg && !error; deg++) {
         int size = IPP_MIN(strSize, basicSize);
         error = NULL == cpGFpSetOctString(pDataElm, pStr, size, pBasicGFE);

         pDataElm += basicElemLen;
         strSize -= size;
         pStr += size;
      }

      return error? ippStsOutOfRangeErr : ippStsNoErr;
   }
}