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40 
41 /*
42 //
43 //  Purpose:
44 //     Intel(R) Integrated Performance Primitives. Cryptography Primitives.
45 //     Internal EC over GF(p^m) basic Definitions & Function Prototypes
46 //
47 //     Context:
48 //        gfec_BasePointProduct()
49 //
50 */
51 
52 #include "owndefs.h"
53 #include "owncp.h"
54 #include "pcpgfpecstuff.h"
55 #include "gsscramble.h"
56 
57 
gfec_BasePointProduct(IppsGFpECPoint * pR,const BNU_CHUNK_T * pScalarG,int scalarGlen,const IppsGFpECPoint * pP,const BNU_CHUNK_T * pScalarP,int scalarPlen,IppsGFpECState * pEC,Ipp8u * pScratchBuffer)58 IppsGFpECPoint* gfec_BasePointProduct(IppsGFpECPoint* pR,
59                         const BNU_CHUNK_T* pScalarG, int scalarGlen,
60                         const IppsGFpECPoint* pP, const BNU_CHUNK_T* pScalarP, int scalarPlen,
61                         IppsGFpECState* pEC, Ipp8u* pScratchBuffer)
62 {
63    FIX_BNU(pScalarG, scalarGlen);
64    FIX_BNU(pScalarP, scalarPlen);
65 
66    {
67       gsModEngine* pGForder = ECP_MONT_R(pEC);
68       int orderBits = MOD_BITSIZE(pGForder);
69       int orderLen  = MOD_LEN(pGForder);
70       BNU_CHUNK_T* tmpScalarG = cpGFpGetPool(2, pGForder);
71       BNU_CHUNK_T* tmpScalarP = tmpScalarG+orderLen+1;
72 
73       cpGFpElementCopyPadd(tmpScalarG, orderLen+1, pScalarG,scalarGlen);
74       cpGFpElementCopyPadd(tmpScalarP, orderLen+1, pScalarP,scalarPlen);
75 
76       if(ECP_PREMULBP(pEC)) {
77          BNU_CHUNK_T* productG = cpEcGFpGetPool(2, pEC);
78          BNU_CHUNK_T* productP = productG+ECP_POINTLEN(pEC);
79 
80          gfec_base_point_mul(productG, (Ipp8u*)tmpScalarG, orderBits, pEC);
81          gfec_point_mul(productP, ECP_POINT_X(pP), (Ipp8u*)tmpScalarP, orderBits, pEC, pScratchBuffer);
82          gfec_point_add(ECP_POINT_X(pR), productG, productP, pEC);
83 
84          cpEcGFpReleasePool(2, pEC);
85       }
86 
87       else {
88          gfec_point_prod(ECP_POINT_X(pR),
89                          ECP_G(pEC), (Ipp8u*)tmpScalarG,
90                          ECP_POINT_X(pP), (Ipp8u*)tmpScalarP,
91                          orderBits,
92                          pEC, pScratchBuffer);
93       }
94 
95       cpGFpReleasePool(2, pGForder);
96    }
97 
98    ECP_POINT_FLAGS(pR) = gfec_IsPointAtInfinity(pR)? 0 : ECP_FINITE_POINT;
99    return pR;
100 }
101