ext/ipp/sources/ippcp/pcpgfpecget.c

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/* 
//     Intel(R) Integrated Performance Primitives. Cryptography Primitives.
//     EC over GF(p^m) definitinons
// 
//     Context:
//        ippsGFpECGet()
//
*/

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

/*F*
// Name: ippsGFpECGet
//
// Purpose: Extracts the parameters of an elliptic curve
//
// Returns:                   Reason:
//    ippStsNullPtrErr              NULL == pEC
//
//    ippStsContextMatchErr         invalid pEC->idCtx
//                                  invalid pA->idCtx
//                                  invalid pB->idCtx
//
//    ippStsOutOfRangeErr           GFPE_ROOM(pA)!=GFP_FELEN(pGFE)
//                                  GFPE_ROOM(pB)!=GFP_FELEN(pGFE)
//
//    ippStsNoErr                   no error
//
// Parameters:
//    ppGFp      Pointer to the pointer to the context of underlying finite field
//    pA         Pointer to a copy of the coefficient A of the equation defining the elliptic curve
//    pB         Pointer to a copy of the coefficient B of the equation defining the elliptic curve
//    pEC        Pointer to the context of the elliptic curve
//
*F*/

IPPFUN(IppStatus, ippsGFpECGet,(IppsGFpState** const ppGFp,
                                IppsGFpElement* pA, IppsGFpElement* pB,
                                const IppsGFpECState* pEC))
{
   IPP_BAD_PTR1_RET(pEC);
   pEC = (IppsGFpECState*)( IPP_ALIGNED_PTR(pEC, ECGFP_ALIGNMENT) );
   IPP_BADARG_RET( !ECP_TEST_ID(pEC), ippStsContextMatchErr );

   {
      const IppsGFpState* pGF = ECP_GFP(pEC);
      gsModEngine* pGFE = GFP_PMA(pGF);
      Ipp32u elementSize = GFP_FELEN(pGFE);

      if(ppGFp) {
         *ppGFp = (IppsGFpState*)pGF;
      }

      if(pA) {
         IPP_BADARG_RET( !GFPE_TEST_ID(pA), ippStsContextMatchErr );
         IPP_BADARG_RET( GFPE_ROOM(pA)!=GFP_FELEN(pGFE), ippStsOutOfRangeErr);
         cpGFpElementCopy(GFPE_DATA(pA), ECP_A(pEC), elementSize);
      }
      if(pB) {
         IPP_BADARG_RET( !GFPE_TEST_ID(pB), ippStsContextMatchErr );
         IPP_BADARG_RET( GFPE_ROOM(pB)!=GFP_FELEN(pGFE), ippStsOutOfRangeErr);
         cpGFpElementCopy(GFPE_DATA(pB), ECP_B(pEC), elementSize);
      }

      return ippStsNoErr;
   }
}