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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