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     40 
     41 /*
     42 //     Intel(R) Integrated Performance Primitives. Cryptography Primitives.
     43 //     EC over GF(p^m) definitinons
     44 //
     45 //     Context:
     46 //        ippsGFpECGet()
     47 //
     48 */
     49 
     50 #include "owndefs.h"
     51 #include "owncp.h"
     52 #include "pcpgfpecstuff.h"
     53 #include "pcpeccp.h"
     54 
     55 /*F*
     56 // Name: ippsGFpECGet
     57 //
     58 // Purpose: Extracts the parameters of an elliptic curve
     59 //
     60 // Returns:                   Reason:
     61 //    ippStsNullPtrErr              NULL == pEC
     62 //
     63 //    ippStsContextMatchErr         invalid pEC->idCtx
     64 //                                  invalid pA->idCtx
     65 //                                  invalid pB->idCtx
     66 //
     67 //    ippStsOutOfRangeErr           GFPE_ROOM(pA)!=GFP_FELEN(pGFE)
     68 //                                  GFPE_ROOM(pB)!=GFP_FELEN(pGFE)
     69 //
     70 //    ippStsNoErr                   no error
     71 //
     72 // Parameters:
     73 //    ppGFp      Pointer to the pointer to the context of underlying finite field
     74 //    pA         Pointer to a copy of the coefficient A of the equation defining the elliptic curve
     75 //    pB         Pointer to a copy of the coefficient B of the equation defining the elliptic curve
     76 //    pEC        Pointer to the context of the elliptic curve
     77 //
     78 *F*/
     79 
     80 IPPFUN(IppStatus, ippsGFpECGet,(IppsGFpState** const ppGFp,
     81                                 IppsGFpElement* pA, IppsGFpElement* pB,
     82                                 const IppsGFpECState* pEC))
     83 {
     84    IPP_BAD_PTR1_RET(pEC);
     85    pEC = (IppsGFpECState*)( IPP_ALIGNED_PTR(pEC, ECGFP_ALIGNMENT) );
     86    IPP_BADARG_RET( !ECP_TEST_ID(pEC), ippStsContextMatchErr );
     87 
     88    {
     89       const IppsGFpState* pGF = ECP_GFP(pEC);
     90       gsModEngine* pGFE = GFP_PMA(pGF);
     91       Ipp32u elementSize = GFP_FELEN(pGFE);
     92 
     93       if(ppGFp) {
     94          *ppGFp = (IppsGFpState*)pGF;
     95       }
     96 
     97       if(pA) {
     98          IPP_BADARG_RET( !GFPE_TEST_ID(pA), ippStsContextMatchErr );
     99          IPP_BADARG_RET( GFPE_ROOM(pA)!=GFP_FELEN(pGFE), ippStsOutOfRangeErr);
    100          cpGFpElementCopy(GFPE_DATA(pA), ECP_A(pEC), elementSize);
    101       }
    102       if(pB) {
    103          IPP_BADARG_RET( !GFPE_TEST_ID(pB), ippStsContextMatchErr );
    104          IPP_BADARG_RET( GFPE_ROOM(pB)!=GFP_FELEN(pGFE), ippStsOutOfRangeErr);
    105          cpGFpElementCopy(GFPE_DATA(pB), ECP_B(pEC), elementSize);
    106       }
    107 
    108       return ippStsNoErr;
    109    }
    110 }
    111