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| |
| /* |
| // |
| // Purpose: |
| // Intel(R) Integrated Performance Primitives. Cryptography Primitives. |
| // EC over GF(p) Operations |
| // |
| // Context: |
| // ippsGFpECMakePoint() |
| // |
| */ |
| |
| #include "owndefs.h" |
| #include "owncp.h" |
| #include "pcpgfpecstuff.h" |
| #include "pcphash.h" |
| #include "pcphash_rmf.h" |
| |
| |
| /* |
| computes for given x- computes y-coodinates of P(x,y) point belonging EC if existing |
| */ |
| |
| /*F* |
| // Name: ippsGFpECMakePoint |
| // |
| // Purpose: Constructs the coordinates of a point on an elliptic curve based on the X-coordinate |
| // |
| // Returns: Reason: |
| // ippStsNullPtrErr pPoint == NULL |
| // pEC == NULL |
| // pX == NULL |
| // |
| // ippStsContextMatchErr invalid pEC->idCtx |
| // invalid pPoint->idCtx |
| // invalid pX->idCtx |
| // |
| // ippStsBadArgErr !GFP_IS_BASIC(GFP_PMA(ECP_GFP(pEC))) |
| // |
| // ippStsOutOfRangeErr ECP_POINT_FELEN(pPoint)!=GFP_FELEN() |
| // GFPE_ROOM(pX)!=GFP_FELEN() |
| // |
| // ippStsQuadraticNonResidueErr square of the Y-coordinate of |
| // the pPoint is a quadratic non-residue modulo |
| // |
| // |
| // ippStsNoErr no error |
| // |
| // Parameters: |
| // pPoint Pointer to the IppsGFpECPoint context |
| // pEC Pointer to the context of the elliptic curve |
| // pX Pointer to the X-coordinate of the point on the elliptic curve |
| // |
| // Note: |
| // Is not a fact that computed point belongs to BP-related subgroup BP |
| // |
| *F*/ |
| |
| IPPFUN(IppStatus, ippsGFpECMakePoint,(const IppsGFpElement* pX, IppsGFpECPoint* pPoint, IppsGFpECState* pEC)) |
| { |
| IPP_BAD_PTR3_RET(pX, pPoint, pEC); |
| pEC = (IppsGFpECState*)( IPP_ALIGNED_PTR(pEC, ECGFP_ALIGNMENT) ); |
| IPP_BADARG_RET( !ECP_TEST_ID(pEC), ippStsContextMatchErr ); |
| IPP_BADARG_RET( !GFP_IS_BASIC(GFP_PMA(ECP_GFP(pEC))), ippStsBadArgErr ); |
| IPP_BADARG_RET( !GFPE_TEST_ID(pX), ippStsContextMatchErr ); |
| IPP_BADARG_RET( !ECP_POINT_TEST_ID(pPoint), ippStsContextMatchErr ); |
| |
| IPP_BADARG_RET( GFPE_ROOM(pX)!=GFP_FELEN(GFP_PMA(ECP_GFP(pEC))), ippStsOutOfRangeErr); |
| IPP_BADARG_RET( ECP_POINT_FELEN(pPoint)!=GFP_FELEN(GFP_PMA(ECP_GFP(pEC))), ippStsOutOfRangeErr); |
| |
| return gfec_MakePoint(pPoint, GFPE_DATA(pX), pEC)? ippStsNoErr : ippStsQuadraticNonResidueErr; |
| } |
