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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 //        ippsGFpECBindGxyTblStd521r1()
     47 //
     48 */
     49 
     50 #include "owndefs.h"
     51 #include "owncp.h"
     52 #include "pcpgfpecstuff.h"
     53 #include "pcpeccp.h"
     54 
     55 
     56 
     57 static IppStatus cpGFpECBindGxyTbl(const BNU_CHUNK_T* pPrime,
     58                                    const cpPrecompAP* preComp,
     59                                    IppsGFpECState* pEC)
     60 {
     61    IPP_BAD_PTR1_RET(pEC);
     62    /* use aligned EC context */
     63    pEC = (IppsGFpECState*)( IPP_ALIGNED_PTR(pEC, ECGFP_ALIGNMENT) );
     64    IPP_BADARG_RET(!ECP_TEST_ID(pEC), ippStsContextMatchErr);
     65 
     66    {
     67       IppsGFpState* pGF = ECP_GFP(pEC);
     68       gsModEngine* pGFE = GFP_PMA(pGF);
     69       Ipp32u elemLen = GFP_FELEN(pGFE);
     70 
     71       /* test if GF is prime GF */
     72       IPP_BADARG_RET(!GFP_IS_BASIC(pGFE), ippStsBadArgErr);
     73       /* test underlying prime value*/
     74       IPP_BADARG_RET(cpCmp_BNU(pPrime, elemLen, GFP_MODULUS(pGFE), elemLen), ippStsBadArgErr);
     75 
     76       {
     77          BNU_CHUNK_T* pbp_ec = ECP_G(pEC);
     78          int cmpFlag;
     79          BNU_CHUNK_T* pbp_tbl = cpEcGFpGetPool(1, pEC);
     80 
     81          selectAP select_affine_point = preComp->select_affine_point;
     82          const BNU_CHUNK_T* pTbl = preComp->pTbl;
     83          select_affine_point(pbp_tbl, pTbl, 1);
     84 
     85          /* check if EC's and G-table's Base Point is the same */
     86          cmpFlag = cpCmp_BNU(pbp_ec, elemLen*2, pbp_tbl, elemLen*2);
     87 
     88          cpEcGFpReleasePool(1, pEC);
     89 
     90          return cmpFlag? ippStsBadArgErr : ippStsNoErr;
     91       }
     92    }
     93 }
     94 
     95 /*F*
     96 // Name: ippsGFpECBindGxyTblStd521r1
     97 //
     98 // Purpose: Enables the use of base point-based pre-computed tables of EC521r1
     99 //
    100 // Returns:                   Reason:
    101 //    ippStsNullPtrErr              NULL == pEC
    102 //
    103 //    ippStsContextMatchErr         invalid pEC->idCtx
    104 //
    105 //    ippStsBadArgErr               pEC is not EC521r1
    106 //
    107 //    ippStsNoErr                   no error
    108 //
    109 // Parameters:
    110 //    pEC        Pointer to the context of the elliptic curve
    111 //
    112 *F*/
    113 
    114 IPPFUN(IppStatus, ippsGFpECBindGxyTblStd521r1,(IppsGFpECState* pEC))
    115 {
    116    IppStatus sts = cpGFpECBindGxyTbl(secp521r1_p, gfpec_precom_nistP521r1_fun(), pEC);
    117 
    118    /* setup pre-computed g-table and point access function */
    119    if(ippStsNoErr==sts)
    120       ECP_PREMULBP(pEC) = gfpec_precom_nistP521r1_fun();
    121 
    122    return sts;
    123 }
    124