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     40 
     41 /*
     42 //     Intel(R) Integrated Performance Primitives. Cryptography Primitives.
     43 //     Operations over GF(p).
     44 //
     45 //     Context:
     46 //        ippsGFpExp()
     47 //
     48 */
     49 #include "owndefs.h"
     50 #include "owncp.h"
     51 
     52 #include "pcpgfpstuff.h"
     53 #include "pcpgfpxstuff.h"
     54 #include "pcptool.h"
     55 
     56 
     57 /*F*
     58 // Name: ippsGFpExp
     59 //
     60 // Purpose: Raise GF element to the specified power
     61 //
     62 // Returns:                   Reason:
     63 //    ippStsNullPtrErr              NULL == pGFp
     64 //                                  NULL == pA
     65 //                                  NULL == pR
     66 //                                  NULL == pE
     67 //
     68 //    ippStsContextMatchErr         invalid pGFp->idCtx
     69 //                                  invalid pA->idCtx
     70 //                                  invalid pR->idCtx
     71 //                                  invalid pE->idCtx
     72 //
     73 //    ippStsOutOfRangeErr           GFPE_ROOM() != GFP_FELEN()
     74 //
     75 //    ippStsNoErr                   no error
     76 //
     77 // Parameters:
     78 //    pA              Pointer to the context of the first finite field element.
     79 //    pE              Pointer to the Big Number context storing the exponent
     80 //    pR              Pointer to the context of the result finite field element.
     81 //    pGFp            Pointer to the context of the finite field.
     82 //    pScratchBuffer  Pointer to the scratch buffer.
     83 //
     84 *F*/
     85 
     86 IPPFUN(IppStatus, ippsGFpExp,(const IppsGFpElement* pA, const IppsBigNumState* pE,
     87                                     IppsGFpElement* pR, IppsGFpState* pGFp,
     88                                     Ipp8u* pScratchBuffer))
     89 {
     90    IPP_BAD_PTR4_RET(pA, pE, pR, pGFp);
     91    pGFp = (IppsGFpState*)( IPP_ALIGNED_PTR(pGFp, GFP_ALIGNMENT) );
     92    IPP_BADARG_RET( !GFP_TEST_ID(pGFp), ippStsContextMatchErr );
     93    IPP_BADARG_RET( !GFPE_TEST_ID(pA), ippStsContextMatchErr );
     94    IPP_BADARG_RET( !GFPE_TEST_ID(pR), ippStsContextMatchErr );
     95 
     96    pE = (IppsBigNumState*)( IPP_ALIGNED_PTR(pE, BN_ALIGNMENT) );
     97    IPP_BADARG_RET( !BN_VALID_ID(pE), ippStsContextMatchErr );
     98    {
     99       gsModEngine* pGFE = GFP_PMA(pGFp);
    100       IPP_BADARG_RET( (GFPE_ROOM(pA)!=GFP_FELEN(pGFE)) || (GFPE_ROOM(pR)!=GFP_FELEN(pGFE)), ippStsOutOfRangeErr);
    101 
    102       cpGFpxExp(GFPE_DATA(pR), GFPE_DATA(pA), BN_NUMBER(pE), BN_SIZE(pE), pGFE, pScratchBuffer);
    103       return ippStsNoErr;
    104    }
    105 }