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     40 
     41 /*
     42 //
     43 //  Purpose:
     44 //     Intel(R) Integrated Performance Primitives. Cryptography Primitives.
     45 //     EC over GF(p) Operations
     46 //
     47 //     Context:
     48 //        ippsGFpECMakePoint()
     49 //
     50 */
     51 
     52 #include "owndefs.h"
     53 #include "owncp.h"
     54 #include "pcpgfpecstuff.h"
     55 #include "pcphash.h"
     56 #include "pcphash_rmf.h"
     57 
     58 
     59 /*
     60    computes for given x- computes y-coodinates of P(x,y) point belonging EC if existing
     61 */
     62 
     63 /*F*
     64 // Name: ippsGFpECMakePoint
     65 //
     66 // Purpose: Constructs the coordinates of a point on an elliptic curve based on the X-coordinate
     67 //
     68 // Returns:                   Reason:
     69 //    ippStsNullPtrErr               pPoint == NULL
     70 //                                   pEC == NULL
     71 //                                   pX == NULL
     72 //
     73 //    ippStsContextMatchErr          invalid pEC->idCtx
     74 //                                   invalid pPoint->idCtx
     75 //                                   invalid pX->idCtx
     76 //
     77 //    ippStsBadArgErr                !GFP_IS_BASIC(GFP_PMA(ECP_GFP(pEC)))
     78 //
     79 //    ippStsOutOfRangeErr            ECP_POINT_FELEN(pPoint)!=GFP_FELEN()
     80 //                                   GFPE_ROOM(pX)!=GFP_FELEN()
     81 //
     82 //    ippStsQuadraticNonResidueErr   square of the Y-coordinate of
     83 //                                   the pPoint is a quadratic non-residue modulo
     84 //
     85 //
     86 //    ippStsNoErr                    no error
     87 //
     88 // Parameters:
     89 //    pPoint      Pointer to the IppsGFpECPoint context
     90 //    pEC         Pointer to the context of the elliptic curve
     91 //    pX          Pointer to the X-coordinate of the point on the elliptic curve
     92 //
     93 // Note:
     94 //    Is not a fact that computed point belongs to BP-related subgroup BP
     95 //
     96 *F*/
     97 
     98 IPPFUN(IppStatus, ippsGFpECMakePoint,(const IppsGFpElement* pX, IppsGFpECPoint* pPoint, IppsGFpECState* pEC))
     99 {
    100    IPP_BAD_PTR3_RET(pX, pPoint, pEC);
    101    pEC = (IppsGFpECState*)( IPP_ALIGNED_PTR(pEC, ECGFP_ALIGNMENT) );
    102    IPP_BADARG_RET( !ECP_TEST_ID(pEC), ippStsContextMatchErr );
    103    IPP_BADARG_RET( !GFP_IS_BASIC(GFP_PMA(ECP_GFP(pEC))), ippStsBadArgErr );
    104    IPP_BADARG_RET( !GFPE_TEST_ID(pX), ippStsContextMatchErr );
    105    IPP_BADARG_RET( !ECP_POINT_TEST_ID(pPoint), ippStsContextMatchErr );
    106 
    107    IPP_BADARG_RET( GFPE_ROOM(pX)!=GFP_FELEN(GFP_PMA(ECP_GFP(pEC))), ippStsOutOfRangeErr);
    108    IPP_BADARG_RET( ECP_POINT_FELEN(pPoint)!=GFP_FELEN(GFP_PMA(ECP_GFP(pEC))), ippStsOutOfRangeErr);
    109 
    110    return gfec_MakePoint(pPoint, GFPE_DATA(pX), pEC)? ippStsNoErr : ippStsQuadraticNonResidueErr;
    111 }
    112