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     40 
     41 /*
     42 //     Intel(R) Integrated Performance Primitives. Cryptography Primitives.
     43 //     Operations over GF(p).
     44 //
     45 //     Context:
     46 //        ippsGFpSub_PE()
     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 /*F*
     57 // Name: ippsGFpSub_PE
     58 //
     59 // Purpose: Subtract of GF element and parent GF element
     60 //
     61 // Returns:                   Reason:
     62 //    ippStsNullPtrErr              NULL == pGFp
     63 //                                  NULL == pA
     64 //                                  NULL == pR
     65 //                                  NULL == pParentB
     66 //
     67 //    ippStsContextMatchErr         invalid pGFp->idCtx
     68 //                                  invalid pA->idCtx
     69 //                                  invalid pR->idCtx
     70 //                                  invalid pParentB->idCtx
     71 //
     72 //    ippStsOutOfRangeErr           GFPE_ROOM() != GFP_FELEN()
     73 //
     74 //    ippStsBadArgErr               pGFp does not specify prime field
     75 //
     76 //    ippStsNoErr                   no error
     77 //
     78 // Parameters:
     79 //    pA         Pointer to the context of the first finite field element.
     80 //    pParentB   Pointer to the context of the second finite field element.
     81 //    pR         Pointer to the context of the result finite field element.
     82 //    pGFp       Pointer to the context of the finite field.
     83 //
     84 *F*/
     85 
     86 IPPFUN(IppStatus, ippsGFpSub_PE,(const IppsGFpElement* pA, const IppsGFpElement* pParentB,
     87                                  IppsGFpElement* pR, IppsGFpState* pGFp))
     88 {
     89    IPP_BAD_PTR4_RET(pA, pParentB, pR, pGFp);
     90    pGFp = (IppsGFpState*)( IPP_ALIGNED_PTR(pGFp, GFP_ALIGNMENT) );
     91    IPP_BADARG_RET( !GFP_TEST_ID(pGFp), ippStsContextMatchErr );
     92    IPP_BADARG_RET( !GFPE_TEST_ID(pA), ippStsContextMatchErr );
     93    IPP_BADARG_RET( !GFPE_TEST_ID(pParentB), ippStsContextMatchErr );
     94    IPP_BADARG_RET( !GFPE_TEST_ID(pR), ippStsContextMatchErr );
     95    {
     96       gsModEngine* pGFE = GFP_PMA(pGFp);
     97       IPP_BADARG_RET( GFP_IS_BASIC(pGFE), ippStsBadArgErr )
     98       IPP_BADARG_RET( (GFPE_ROOM(pA)!=GFP_FELEN(pGFE)) || (GFPE_ROOM(pR)!=GFP_FELEN(pGFE)), ippStsOutOfRangeErr);
     99       IPP_BADARG_RET( (GFPE_ROOM(pParentB)!=GFP_FELEN(GFP_PARENT(pGFE))), ippStsOutOfRangeErr);
    100 
    101       cpGFpxSub_GFE(GFPE_DATA(pR), GFPE_DATA(pA), GFPE_DATA(pParentB), pGFE);
    102       return ippStsNoErr;
    103    }
    104 }
    105