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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 //        ippsGFpECGetPointRegular()
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 /*F*
59 // Name: ippsGFpECGetPointRegular
60 //
61 // Purpose: Retrieves coordinates of a point on an elliptic curve in the regular domain
62 //
63 // Returns:                   Reason:
64 //    ippStsNullPtrErr               pPoint == NULL
65 //                                   pEC == NULL
66 //
67 //
68 //    ippStsContextMatchErr          invalid pEC->idCtx
69 //                                   invalid pPoint->idCtx
70 //                                   invalid pX->idCtx
71 //                                   invalid pY->idCtx
72 //
73 //    ippStsOutOfRangeErr            ECP_POINT_FELEN(pPoint)!=GFP_FELEN()
74 //                                   BN_ROOM(pX)*BNU_CHUNK_BITS<GFP_FEBITLEN(pGFE))
75 //                                   BN_ROOM(pY)*BNU_CHUNK_BITS<GFP_FEBITLEN(pGFE))
76 //
77 //    ippStsNoErr                    no error
78 //
79 // Parameters:
80 //    pPoint      Pointer to the IppsGFpECPoint context
81 //    pEC         Pointer to the context of the elliptic curve
82 //    pX, pY      Pointers to the X and Y coordinates of a point on the elliptic curve
83 //
84 *F*/
85 
86 IPPFUN(IppStatus, ippsGFpECGetPointRegular,(const IppsGFpECPoint* pPoint,
87                                                   IppsBigNumState* pX, IppsBigNumState* pY,
88                                                   IppsGFpECState* pEC))
89 {
90    IppsGFpState*  pGF;
91    gsModEngine* pGFE;
92 
93    IPP_BAD_PTR2_RET(pPoint, pEC);
94    pEC = (IppsGFpECState*)( IPP_ALIGNED_PTR(pEC, ECGFP_ALIGNMENT) );
95    IPP_BADARG_RET( !ECP_TEST_ID(pEC), ippStsContextMatchErr );
96    IPP_BADARG_RET( !ECP_POINT_TEST_ID(pPoint), ippStsContextMatchErr );
97 
98    pGF = ECP_GFP(pEC);
99    pGFE = GFP_PMA(pGF);
100 
101    if(pX) {
102       pX = (IppsBigNumState*)( IPP_ALIGNED_PTR(pX, BN_ALIGNMENT) );
103       IPP_BADARG_RET(!BN_VALID_ID(pX), ippStsContextMatchErr );
104       IPP_BADARG_RET(BN_ROOM(pX)*BNU_CHUNK_BITS<GFP_FEBITLEN(pGFE), ippStsOutOfRangeErr);
105    }
106    if(pY) {
107       pY = (IppsBigNumState*)( IPP_ALIGNED_PTR(pY, BN_ALIGNMENT) );
108       IPP_BADARG_RET(!BN_VALID_ID(pY), ippStsContextMatchErr );
109       IPP_BADARG_RET(BN_ROOM(pY)*BNU_CHUNK_BITS<GFP_FEBITLEN(pGFE), ippStsOutOfRangeErr);
110    }
111 
112    {
113       int elmLen = GFP_FELEN(pGFE);
114       BNU_CHUNK_T* x = cpGFpGetPool(2, pGFE);
115       BNU_CHUNK_T* y = x + elmLen;
116 
117       /* returns (X,Y) == (0,0) if Point is at infinity */
118       gfec_GetPoint((pX)? x:NULL, (pY)? y:NULL, pPoint, pEC);
119 
120       /* convert into refular domain */
121       if(pX) {
122          GFP_METHOD(pGFE)->decode(x, x, pGFE);
123          ippsSet_BN(ippBigNumPOS, GFP_FELEN32(pGFE), (Ipp32u*)x, pX);
124       }
125       if(pY) {
126          GFP_METHOD(pGFE)->decode(y, y, pGFE);
127          ippsSet_BN(ippBigNumPOS, GFP_FELEN32(pGFE), (Ipp32u*)y, pY);
128       }
129 
130       cpGFpReleasePool(2, pGFE);
131       return ippStsNoErr;
132    }
133 }
134