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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 //        ippsGFpECTstPointInSubgroup()
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 /*F*
60 // Name: ippsGFpECTstPointInSubgroup
61 //
62 // Purpose: Checks if a point belongs to a specified subgroup
63 //
64 // Returns:                   Reason:
65 //    ippStsNullPtrErr               pP == NULL
66 //                                   pEC == NULL
67 //                                   pResult == NULL
68 /                                    pScratchBuffer == NULL
69 //
70 //    ippStsContextMatchErr          invalid pEC->idCtx
71 //                                   pEC->subgroup == NULL
72 //                                   invalid pP->idCtx
73 //
74 //    ippStsOutOfRangeErr            ECP_POINT_FELEN(pP)!=GFP_FELEN()
75 //
76 //    ippStsNoErr                    no error
77 //
78 // Parameters:
79 //    pP              Pointer to the IppsGFpECPoint context
80 //    pEC             Pointer to the context of the elliptic curve
81 //    pResult         Pointer to the result of the check
82 //    pScratchBuffer  Pointer to the scratch buffer
83 //
84 *F*/
85 IPPFUN(IppStatus, ippsGFpECTstPointInSubgroup,(const IppsGFpECPoint* pP,
86                                                IppECResult* pResult,
87                                                IppsGFpECState* pEC,
88                                                Ipp8u* pScratchBuffer))
89 {
90    IPP_BAD_PTR4_RET(pP, pResult, pEC, pScratchBuffer);
91    pEC = (IppsGFpECState*)( IPP_ALIGNED_PTR(pEC, ECGFP_ALIGNMENT) );
92    IPP_BADARG_RET( !ECP_TEST_ID(pEC), ippStsContextMatchErr );
93    IPP_BADARG_RET(!ECP_SUBGROUP(pEC), ippStsContextMatchErr);
94    IPP_BADARG_RET( !ECP_POINT_TEST_ID(pP), ippStsContextMatchErr );
95 
96    IPP_BADARG_RET( ECP_POINT_FELEN(pP)!=GFP_FELEN(GFP_PMA(ECP_GFP(pEC))), ippStsOutOfRangeErr);
97 
98    {
99       IppECResult tstResult;
100       ippsGFpECTstPoint(pP, &tstResult, pEC);
101 
102       if(ippECValid==tstResult) {
103          IppsGFpECPoint T;
104          cpEcGFpInitPoint(&T, cpEcGFpGetPool(1, pEC),0, pEC);
105 
106          gfec_MulPoint(&T, pP, MOD_MODULUS(ECP_MONT_R(pEC)), BITS_BNU_CHUNK(ECP_ORDBITSIZE(pEC)), /*0,*/ pEC, pScratchBuffer);
107          tstResult = gfec_IsPointAtInfinity(&T)? ippECValid : ippECPointOutOfGroup;
108 
109          cpEcGFpReleasePool(1, pEC);
110       }
111       *pResult = tstResult;
112 
113       return ippStsNoErr;
114    }
115 }
116