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     40 
     41 /*
     42 //
     43 //  Purpose:
     44 //     Cryptography Primitive.
     45 //     EC over Prime Finite Field (EC Point operations)
     46 //
     47 //  Contents:
     48 //        ippsECCPSetPoint()
     49 //
     50 */
     51 
     52 #include "owndefs.h"
     53 #include "owncp.h"
     54 #include "pcpeccp.h"
     55 
     56 /*F*
     57 //    Name: ippsECCPSetPoint
     58 //
     59 // Purpose: Converts regular affine coordinates EC point (pX,pY)
     60 //          into internal presentation - montgomery projective.
     61 //
     62 // Returns:                Reason:
     63 //    ippStsNullPtrErr        NULL == pEC
     64 //                            NULL == pPoint
     65 //                            NULL == pX
     66 //                            NULL == pY
     67 //
     68 //    ippStsContextMatchErr   illegal pEC->idCtx
     69 //                            illegal pX->idCtx
     70 //                            illegal pY->idCtx
     71 //                            illegal pPoint->idCtx
     72 //
     73 //    ippStsOutOfECErr        point out-of EC
     74 //
     75 //    ippStsNoErr             no errors
     76 //
     77 // Parameters:
     78 //    pX          pointer to the regular affine coordinate X
     79 //    pY          pointer to the regular affine coordinate Y
     80 //    pPoint      pointer to the EC Point context
     81 //    pEC        pointer to the ECCP context
     82 //
     83 // Note:
     84 //    if B==0 and (x,y)=(0,y) then point at Infinity will be set up
     85 //    if B!=0 and (x,y)=(0,0) then point at Infinity will be set up
     86 //    else point with requested coordinates (x,y) wil be set up
     87 //    There are no check validation inside!
     88 //
     89 *F*/
     90 IPPFUN(IppStatus, ippsECCPSetPoint,(const IppsBigNumState* pX,
     91                                         const IppsBigNumState* pY,
     92                                         IppsECCPPointState* pPoint,
     93                                         IppsECCPState* pEC))
     94 {
     95    /* test pEC */
     96    IPP_BAD_PTR1_RET(pEC);
     97    /* use aligned EC context */
     98    pEC = (IppsGFpECState*)( IPP_ALIGNED_PTR(pEC, ECGFP_ALIGNMENT) );
     99    IPP_BADARG_RET(!ECP_TEST_ID(pEC), ippStsContextMatchErr);
    100 
    101    /* test pX and pY */
    102    IPP_BAD_PTR2_RET(pX,pY);
    103    pX = (IppsBigNumState*)( IPP_ALIGNED_PTR(pX, ALIGN_VAL) );
    104    pY = (IppsBigNumState*)( IPP_ALIGNED_PTR(pY, ALIGN_VAL) );
    105    IPP_BADARG_RET(!BN_VALID_ID(pX), ippStsContextMatchErr);
    106    IPP_BADARG_RET(!BN_VALID_ID(pY), ippStsContextMatchErr);
    107 
    108    {
    109       IppStatus sts;
    110 
    111       IppsGFpState* pGF = ECP_GFP(pEC);
    112       gsModEngine* pGFE = GFP_PMA(pGF);
    113       int elemLen = GFP_FELEN(pGFE);
    114       IppsGFpElement elmX, elmY;
    115 
    116       cpGFpElementConstruct(&elmX, cpGFpGetPool(1, pGFE), elemLen);
    117       cpGFpElementConstruct(&elmY, cpGFpGetPool(1, pGFE), elemLen);
    118       do {
    119          BNU_CHUNK_T* pData = BN_NUMBER(pX);
    120          int ns = BN_SIZE(pX);
    121          sts = ippsGFpSetElement((Ipp32u*)pData, BITS2WORD32_SIZE(BITSIZE_BNU(pData, ns)), &elmX, pGF);
    122          if(ippStsNoErr!=sts) break;
    123          pData = BN_NUMBER(pY);
    124          ns = BN_SIZE(pY);
    125          sts = ippsGFpSetElement((Ipp32u*)pData, BITS2WORD32_SIZE(BITSIZE_BNU(pData, ns)), &elmY, pGF);
    126          if(ippStsNoErr!=sts) break;
    127          sts = ippsGFpECSetPoint(&elmX, &elmY, pPoint, pEC);
    128       } while(0);
    129 
    130       cpGFpReleasePool(2, pGFE);
    131       return sts;
    132    }
    133 }
    134